Turnover device and insulating sheet attaching apparatus

Abstract

The application provides a turnover device and an insulating sheet pasting device, and relates to the technical field of battery manufacturing. The turnover device comprises a bottom plate, a connecting rod, a rotating arm, a rotating table and a guide sliding part. The connecting rod is movably arranged on the bottom plate. The rotating arm is rotatably connected to the connecting rod, and the rotating arm is provided with a pickup. The rotating table is provided with a guide sliding groove, and the guide sliding groove comprises a first sliding groove and a second sliding groove which are connected in communication. The extension direction of the first sliding groove and the extension direction of the second sliding groove intersect. The guide sliding part is movably arranged in the guide sliding groove, and the guide sliding part is connected to the connecting rod. The connecting rod moves along the bottom plate, can drive the guide sliding part to move along the guide sliding groove, and further drives the rotating arm to rotate, so that the turnover of the pickup is realized. The structure is simple, the pickup, turnover and pasting functions are integrated, the operation is convenient, and the pasting efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a flipping device and an insulating sheet attaching equipment. Background Technology

[0002] In existing battery manufacturing processes, insulating sheets are typically attached to the surface of the battery cell to provide electrical isolation between the cell and the casing. The process involves picking up the insulating sheet, flipping it, and then attaching it to the cell surface. This flipping and attaching mechanism is complex, with different modules performing the picking, flipping, and attaching actions at different stations. This numerous transfer steps can easily lead to problems such as incomplete insulation sheet attachment and low attachment efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a flipping device and an insulating sheet applicator, which has a simple structure, integrates picking, flipping and applicating functions, is easy to operate, and has high applicating efficiency.

[0004] In a first aspect, this utility model provides a flipping device, comprising:

[0005] Base plate;

[0006] A connecting rod, which is movably disposed on the base plate;

[0007] A rotating arm, rotatably connected to the connecting rod; the rotating arm is equipped with a pickup element;

[0008] A rotating table, wherein the rotating table is provided with a guide groove, the guide groove including a first groove and a second groove that are connected to each other, the extending directions of the first groove and the extending directions of the second groove intersect;

[0009] A guide slide is movably disposed in the guide slide groove and is connected to the connecting rod.

[0010] In an optional embodiment, the guide slide includes a first rotating shaft, a second rotating shaft, and a connecting member; the connecting member is rotatably connected to the first rotating shaft and the second rotating shaft respectively; the first rotating shaft is connected to the connecting rod, and the first rotating shaft is rotatably connected to the rotating arm; the second rotating shaft can slide along the guide slide groove.

[0011] In an optional embodiment, a sliding block is connected to the second rotating shaft, the cross-sectional dimensions of the sliding block being adapted to the cross-sectional dimensions of the guide groove, and the sliding block being able to slide along the guide groove.

[0012] In an optional embodiment, the first rotating shaft passes through the connector, the connecting rod, and the rotating arm, with the connecting rod located between the rotating arm and the connector.

[0013] In an optional embodiment, a driving member is also included, which is connected to the connecting rod to drive the connecting rod to move along the base plate.

[0014] In an optional embodiment, the connecting rod includes a first connecting rod, a second connecting rod, and a third connecting rod connected in sequence. The second connecting rod is movably connected to the base plate, and the third connecting rod is rotatably connected to the rotating arm. The first connecting rod is connected to the driving component.

[0015] In an optional embodiment, the base plate is provided with a slide rail, and the connecting rod moves along the slide rail.

[0016] In an optional embodiment, the intersection of the first groove and the second groove is transitioned by a circular arc.

[0017] Secondly, this utility model provides an insulating sheet attaching device, comprising two flipping devices as described in any of the foregoing embodiments, wherein the picking element of one flipping device is used to pick up the battery cell, and the picking element of the other flipping device is used to pick up the insulating sheet; the rotating arms of the two flipping devices rotate toward each other to make the insulating sheet adhere to the surface of the battery cell.

[0018] In an optional embodiment, the bonding surface of the insulating sheet and the battery cell in the bonded state is used as a reference plane, and the included angles of the axes of the two rotating arms of the flipping device relative to the reference plane are equal.

[0019] The flipping device and insulating sheet applicator provided in this embodiment of the invention have the following advantages:

[0020] By setting guide grooves on the rotating platform, including a first groove and a second groove extending in different but connected directions (i.e., the extension direction of the guide grooves is non-linear), the direction of the rotating arm can be changed by the movement of the guide part along the guide groove, thus rotating the rotating arm and achieving a flipping effect. A picking component is provided on the rotating arm to pick up items. This flipping device has a simple structure, integrating picking and flipping functions, and can be applied in the process of attaching insulating sheets to battery cells, realizing the picking, flipping, and attaching of insulating sheets, resulting in higher attaching efficiency and more reliable attaching. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A first-view structural schematic diagram of the flipping device provided in an embodiment of this utility model;

[0023] Figure 2 A structural schematic diagram of the flipping device provided in an embodiment of this utility model from a second perspective;

[0024] Figure 3 A third-view structural schematic diagram of the flipping device provided in an embodiment of this utility model;

[0025] Figure 4 This is a schematic diagram of the state structure of the insulating sheet bonding device before bonding, provided in an embodiment of the present utility model.

[0026] Figure 5 This is a schematic diagram of the state structure of the insulating sheet bonding device provided in the embodiment of the present utility model during the bonding process;

[0027] Figure 6 This is a schematic diagram of the bonding state of the insulating sheet bonding device provided in the embodiment of this utility model.

[0028] Icons: 100-Flipping device; 110-Base plate; 111-Slide rail; 112-Limit block; 120-Connecting rod; 121-First connecting rod; 122-Second connecting rod; 123-Third connecting rod; 130-Rotating arm; 131-Pick-up component; 140-Rotating table; 141-Guide groove; 142-First slide groove; 143-Second slide groove; 150-Guide part; 151-First rotating shaft; 152-Second rotating shaft; 153-Connecting component; 154-Sliding block; 160-Driver component; 210-Insulating sheet; 220-Battery cell. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] The present invention provides a flipping device that can be applied to the equipment for attaching insulating sheets to battery cells. It can realize the picking, flipping and attaching of insulating sheets, resulting in higher attaching efficiency and more reliable attaching.

[0037] Please combine Figures 1 to 3The flipping device 100 includes a base plate 110, a connecting rod 120, a rotating arm 130, a rotating platform 140, and a guide slide 150. The connecting rod 120 is movably mounted on the base plate 110. The rotating arm 130 is rotatably connected to the connecting rod 120 and has a pickup element 131 mounted on it. The rotating platform 140 has a guide slide groove 141, which includes a first slide groove 142 and a second slide groove 143 that are connected to each other. The extending directions of the first slide groove 142 and the second slide groove 143 intersect. The guide slide 150 is movably mounted on the guide slide groove 141 and is connected to the connecting rod 120. The pickup element 131 can pick up items. The connecting rod 120 moves along the base plate 110, which can drive the guide slide 150 to move along the guide slide groove 141, thereby driving the rotating arm 130 to rotate and flipping the items on the pickup element 131. In this embodiment, the pickup component 131 can pick up the insulating sheet 210. The flipping device 100 has a simple structure, integrating pickup, flipping, and bonding functions, and can cleverly complete the pickup, flipping, and bonding actions of the insulating sheet 210 in the process of bonding the insulating sheet 210 to the battery cell 220. All actions are completed on a single flipping device 100, avoiding the steps of transferring the insulating sheet 210 between different devices and multiple positioning, which helps improve bonding accuracy. Furthermore, it is easy to operate and has higher bonding efficiency. Of course, this flipping device 100 can also be applied to other fields to realize the functions of picking up, flipping, and bonding items.

[0038] Optionally, the guide slide 150 includes a first rotating shaft 151, a second rotating shaft 152, and a connecting member 153. The connecting member 153 is rotatably connected to both the first rotating shaft 151 and the second rotating shaft 152. That is, one end of the connecting member 153 is rotatably connected to the first rotating shaft 151, and the other end is rotatably connected to the second rotating shaft 152. The first rotating shaft 151 is connected to the connecting rod 120 and the rotating arm 130. The second rotating shaft 152 can slide along the guide groove 141.

[0039] Optionally, a sliding block 154 is connected to the second rotating shaft 152. The cross-sectional dimensions of the sliding block 154 are adapted to the cross-sectional dimensions of the guide groove 141, and the sliding block 154 can slide along the guide groove 141. It should be understood that the sliding block 154 and the second rotating shaft 152 are fixedly connected, and the connection method includes, but is not limited to, snap-fit, riveting, welding, bonding, threaded connection or bolt connection.

[0040] Optionally, the first rotating shaft 151 passes through the connector 153, the connecting rod 120, and the rotating arm 130, with the connecting rod 120 located between the rotating arm 130 and the connector 153. It is understood that the first rotating shaft 151 and the connecting rod 120 can be rotatably connected or fixedly connected; no specific limitation is made here.

[0041] Optionally, the tilting device 100 further includes a drive component 160, which is connected to the connecting rod 120 to drive the connecting rod 120 to move along the base plate 110. The drive component 160 includes, but is not limited to, a motor, a cylinder, etc.

[0042] Optionally, the connecting rod 120 includes a first connecting rod 121, a second connecting rod 122, and a third connecting rod 123 connected in sequence. The second connecting rod 122 is movably connected to the base plate 110, and the third connecting rod 123 is rotatably connected to the rotating arm 130. The first connecting rod 121 is connected to the driving member 160. In this embodiment, the driving member 160 and the first connecting rod 121 are connected in a transmission manner, and the driving member 160 can drive the first connecting rod 121 to move. The first connecting rod 121 and the second connecting rod 122 are fixedly connected, and the second connecting rod 122 and the third connecting rod 123 are fixedly connected. The third connecting rod 123 is fixedly connected to the first rotating shaft 151, and the first rotating shaft 151 is rotatably connected to the rotating arm 130. In this way, the driving component 160 drives the first link 121 to move, the first link 121 drives the second link 122 to move, the second link 122 drives the third link 123 to move, the third link 123 drives the first rotating shaft 151 and the second rotating shaft 152 to move along the guide groove 141, and the first rotating shaft 151 drives the rotating arm 130 to rotate.

[0043] Of course, in some embodiments, the third link 123 and the first rotating shaft 151 are rotatably connected, which can also achieve a similar technical effect.

[0044] Optionally, the base plate 110 is provided with a slide rail 111, and the connecting rod 120 moves along the slide rail 111. In this embodiment, the second connecting rod 122 is movably mounted on the slide rail 111, and the second connecting rod 122 can move back and forth along the slide rail 111. The slide rail 111 is a linear slide rail 111. In some embodiments, the driving member 160 can be directly connected to the second connecting rod 122, driving the second connecting rod 122 to move linearly along the slide rail 111, thus omitting the structure of the first connecting rod 121. In this embodiment, the first connecting rod 121 is provided to facilitate the installation of the driving member 160, providing more space for the installation of the driving member 160. It also makes the connection structure more reliable, ensuring that the power of the driving member 160 can be effectively transmitted to the second connecting rod 122, driving the second connecting rod 122 to move.

[0045] Optionally, the base plate 110 is provided with limiting blocks 112 at both ends along the slide rail 111. The limiting blocks 112 are used to limit the travel of the second link 122 and prevent the second link 122 from disengaging from the base plate 110.

[0046] Optionally, the rotary table 140 and the base plate 110 are fixedly connected. The base plate 110 serves as the mounting carrier for the rotary table 140, facilitating the movement of the guide slide 150, which is connected to the third connecting rod 123, within the guide slide groove 141 of the rotary table 140. This design results in a compact structure, convenient installation, and more reliable structural movement. Of course, in other embodiments, the rotary table 140 can also be mounted on other carriers; no specific limitations are made here.

[0047] Optionally, the intersection of the first slide groove 142 and the second slide groove 143 is rounded. This allows the guide slide 150 to move more smoothly within the first slide groove 142 and the second slide groove 143, resulting in a smoother rotation of the rotating arm 130 and preventing jamming or impact. Furthermore, during the placement process, the smooth and uniform rotation of the rotating arm 130 helps improve placement accuracy and efficiency.

[0048] In this embodiment, the pickup component 131 can be a suction cup, which can reliably adsorb the insulating sheet 210 to achieve the purpose of picking up the insulating sheet 210. It also ensures that the insulating sheet 210 does not shift or fall off during the rotation of the rotating arm 130. The suction cup is made of insulating material. It is understood that the specific structural form of the pickup component 131 can be flexibly designed depending on the item being picked up.

[0049] It is easy to understand that the extension direction of the first slide groove 142 is L1, and the extension direction of the second slide groove 143 is L2. The two extension directions intersect at approximately a 90-degree angle. Point A is the starting point of the first slide groove 142, and point B is the ending point of the second slide groove 143. When the guide slide 150 moves from point A to point B, the rotating arm 130 can rotate 90 degrees. In some other embodiments, the extension directions of the first slide groove 142 and the second slide groove 143 can be changed, thereby adjusting the rotation angle range of the rotating arm 130. For example, if the two extension directions L1 and L2 form an angle of X degrees, the rotating arm 130 can rotate within the range of 0 to X degrees. Here, X can be any angle value greater than 0 degrees and less than 180 degrees.

[0050] In this embodiment, taking the two extending directions L1 and L2 forming a 90-degree angle as an example, the rotating arm 130 can rotate from 0 degrees to 90 degrees. The extending direction of the slide rail 111 is parallel to the extending direction L1 of the first slide groove 142. When the guide slide 150 is in the first state, that is, when the guide slide 150 is located at the starting point A of the first slide groove 142, the axis of the rotating arm 130 coincides with the straight line containing direction L1. The rotating arm 130 is used to pick up the insulating sheet 210. Subsequently, under the action of the driving member 160, the guide slide 150 moves from point A to point B along the guide slide groove 141. During the movement, the rotating arm 130 gradually rotates. Until the guide slide 150 reaches point B, the rotating arm 130 completes a 90-degree rotation. At this time, the guide slide 150 is in the second state, and the axis of the rotating arm 130 coincides with the straight line containing direction L2. The rotating arm 130 is used to attach the insulating sheet 210 to the surface of the battery cell 220.

[0051] Please combine Figures 4 to 6 This embodiment of the invention also provides an insulating sheet 210 attaching device, comprising two flipping devices 100 as described above. One flipping device 100 has a pickup member 131 for picking up the battery cell 220, and the other flipping device 100 has a pickup member 131 for picking up the insulating sheet 210. The rotating arms 130 of the two flipping devices 100 are mounted on opposite sides of each other. Thus, the rotating arms 130 of the two flipping devices 100 can rotate in a direction closer to each other, so that the insulating sheet 210 is attached to the surface of the battery cell 220.

[0052] Optionally, using the bonding surfaces of the insulating sheet 210 and the battery cell 220 in their bonded state as a reference plane, the axes of the rotating arms 130 of the two flipping devices 100 have equal angles relative to the reference plane. In other words, the rotating arms 130 of the two flipping devices 100 rotate synchronously. During rotation, the angles formed by the axes of the rotating arms 130 of the two flipping devices 100 and the extension direction L1 of their respective first sliding grooves 142 remain equal. This ensures that the two rotating arms 130 rotate 90 degrees simultaneously, so that the surfaces of the insulating sheet 210 and the battery cell 220 are simultaneously in the bonding position, thereby improving bonding accuracy. It should be noted that the surface of the battery cell 220 or the surface of the insulating sheet 210 is pre-attached with an adhesive layer, and when the surface of the battery cell 220 and the insulating sheet 210 are bonded together, they are fixed together. The suction cup of the pickup component 131 has a much smaller adsorption force than the adhesive force between the battery cell 220 and the insulating sheet 210. Therefore, after the insulating sheet 210 is applied, the pickup 131 and the insulating sheet 210 can be separated smoothly.

[0053] Specifically, the bonding process between the insulating sheet 210 and the surface of the battery cell 220 is as follows:

[0054] like Figure 4Two rotating arms 130 are located in the extension direction of the first slide groove 142, and the guide slide 150 is located at the starting point A of the first slide groove 142. The picking part 131 of one rotating arm 130 picks up the insulating sheet 210, and the battery cell 220 is placed on the picking part 131 of the other rotating arm 130. The side of the battery cell 220 that needs to be attached is away from the picking part 131.

[0055] The driving components 160 of the two flipping devices 100 are activated synchronously, driving the guide slide 150 to move along the guide slide groove 141 of the rotary table 140, moving at a constant speed from the starting point A to the ending point B. In this embodiment, the rotating arm 130 on which the battery cell 220 is placed rotates clockwise, and the rotating arm 130 on which the insulating sheet 210 is adsorbed rotates counterclockwise. The two rotating arms 130 rotate synchronously. When the two rotating arms 130 rotate 45 degrees respectively, one side of the surface of the battery cell 220 is tangent to one side of the insulating sheet 210, as shown below. Figure 5 As shown in the figure, C represents the tangent line at the initial contact between the two sides of the battery cell 220 and the insulating sheet 210.

[0056] The two rotating arms 130 continue to rotate until the guide slides 150 of the two flipping devices 100 have both moved to the end point of the second slide groove 143, and then... Figure 6 At this point, both rotating arms 130 have completed a 90-degree rotation. The axes of the two rotating arms 130 are located on the same straight line and are consistent with the extension direction L2 of the second slide groove 143. The surface of the battery cell 220 and the insulating sheet 210 are completely overlapped, completing the mounting process.

[0057] Subsequently, under the action of the drive member 160, the two rotating arms 130 rotate in opposite directions, separating the rotating arm 130 that adsorbs the insulating sheet 210 from the insulating sheet 210 and returning to a state consistent with the extension direction of the first slide groove 142, picking up a new insulating sheet 210, waiting for the next patching. The rotating arm 130 that places the battery cell 220 rotates synchronously in opposite directions, returning to a state consistent with the extension direction of the first slide groove 142, moving the patched battery cell 220 to a predetermined position, and then placing the battery cell 220 to be patched on the pick-up member 131, repeating the above patching process.

[0058] In summary, the flipping device 100 and the insulating sheet attaching equipment provided in this embodiment of the invention can complete the actions of picking up the insulating sheet 210, rotating the insulating sheet 210, and attaching the insulating sheet 210 to the surface of the battery cell 220 on the flipping device 100. Compared with the existing method of picking up, flipping, and attaching the insulating sheet on different tooling, this method can reduce the positioning error caused by multiple transfers of the insulating sheet 210, reduce the probability of damage to the insulating sheet 210, and improve the attaching accuracy and efficiency. Furthermore, it has a compact structure, occupies little space, is easy to install, has low cost, and facilitates subsequent equipment maintenance. In addition, the synchronous rotation of the rotating arms 130 in the two flipping devices 100 is controlled by the drive component 160, making it easy to operate and improving the attaching accuracy and consistency of batch attaching.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Any modifications, equivalent substitutions, improvements, etc., should be included within the protection scope of this utility model.

Claims

1. A flipping device, characterized in that, include: Base plate (110); A connecting rod (120) is movably disposed on the base plate (110); A rotating arm (130) is rotatably connected to the connecting rod (120); a picking element (131) is provided on the rotating arm (130); A rotating table (140) is provided with a guide groove (141). The guide groove (141) includes a first groove (142) and a second groove (143) that are connected to each other. The extension direction of the first groove (142) and the extension direction of the second groove (143) intersect. A guide slide (150) is movably disposed in the guide slide groove (141) and is connected to the connecting rod (120).

2. The flipping device according to claim 1, characterized in that, The guide slide (150) includes a first rotating shaft (151), a second rotating shaft (152), and a connecting member (153); the connecting member (153) is rotatably connected to the first rotating shaft (151) and the second rotating shaft (152) respectively; the first rotating shaft (151) is connected to the connecting rod (120), and the first rotating shaft (151) is rotatably connected to the rotating arm (130); the second rotating shaft (152) can slide along the guide slide groove (141).

3. The flipping device according to claim 2, characterized in that, A sliding block (154) is connected to the second rotating shaft (152). The cross-sectional dimensions of the sliding block (154) are adapted to the cross-sectional dimensions of the guide groove (141). The sliding block (154) can slide along the guide groove (141).

4. The flipping device according to claim 2, characterized in that, The first rotating shaft (151) passes through the connector (153), the connecting rod (120) and the rotating arm (130), and the connecting rod (120) is located between the rotating arm (130) and the connector (153).

5. The flipping device according to claim 1, characterized in that, It also includes a drive unit (160) connected to the connecting rod (120) to drive the connecting rod (120) to move along the base plate (110).

6. The flipping device according to claim 5, characterized in that, The connecting rod (120) includes a first connecting rod (121), a second connecting rod (122), and a third connecting rod (123) connected in sequence. The second connecting rod (122) is movably connected to the base plate (110), and the third connecting rod (123) is rotatably connected to the rotating arm (130). The first connecting rod (121) is connected to the driving member (160).

7. The flipping device according to claim 1, characterized in that, The base plate (110) is provided with a slide rail (111), and the connecting rod (120) moves along the slide rail (111).

8. The flipping device according to any one of claims 1 to 7, characterized in that, The intersection of the first groove (142) and the second groove (143) is a circular arc transition.

9. An insulating sheet applicator, characterized in that, The device includes two flipping devices as described in any one of claims 1 to 8, wherein the picking member (131) of one flipping device is used to pick up the battery cell (220), and the picking member (131) of the other flipping device is used to pick up the insulating sheet (210); the rotating arms (130) of the two flipping devices rotate toward each other to make the insulating sheet (210) adhere to the surface of the battery cell (220).

10. The insulating sheet applicator according to claim 9, characterized in that, With the bonding surface of the insulating sheet (210) and the battery cell (220) in the bonded state as the reference plane, the axes of the two rotating arms (130) of the flipping device are at equal angles with respect to the reference plane.

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