Rotating shaft device and electronic equipment

Abstract

The utility model discloses a rotating shaft device and electronic equipment, the rotating shaft device comprises a first shaft body, a second shaft body, a connecting rod and a transmission belt, the first shaft body and the second shaft body meet the parallel condition, the first shaft body is fixedly connected with the connecting rod, and the second shaft body is rotatably connected with the connecting rod. The transmission belt is connected with the first shaft body and the second shaft body, and the first shaft body and the second shaft body can synchronously and reversely rotate based on the transmission belt. According to the rotating shaft device, large-angle opening and closing can be achieved with the smaller thickness size, and the light and thin design of the electronic equipment is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment, and in particular to a rotating shaft device and electronic equipment. Background Art

[0002] Hinge devices are widely used in electronic devices such as mobile phones, tablet computers, and laptop computers to realize the opening and closing function between two parts of the electronic device. In order to realize large-angle opening and closing, the current hinge devices are generally thick, which is not conducive to the lightweight design of electronic devices. Utility Model Content

[0003] This application provides the following technical solutions:

[0004] A rotating shaft device, comprising:

[0005] The first axis;

[0006] A second axis that is parallel to the first axis;

[0007] A connecting rod connecting the first shaft body and the second shaft body;

[0008] A transmission belt connecting the first shaft and the second shaft;

[0009] The first shaft is fixedly connected to the connecting rod, the second shaft is rotatably connected to the connecting rod, and the first shaft and the second shaft can rotate synchronously in opposite directions based on the transmission belt.

[0010] Optionally, in the above-mentioned rotating shaft device, the first shaft body and the second shaft body are respectively used to connect with a first external object and a second external object that realize relative opening and closing movements through the rotating shaft device, and the connecting rod and / or the first shaft body are provided with a first limiting structure;

[0011] In the first process section of the relative opening movement, the rotation direction of the connecting rod relative to the first external object is opposite to the rotation direction of the second external object relative to the first external object, and the first limiting structure is used to engage with the first external object at the end end of the first process section.

[0012] Optionally, in the above-mentioned rotating shaft device, the connecting rod is provided with a second limiting structure, and the second limiting structure is used to be engaged with the second external object at the end of the first process section;

[0013] In the second process section of the relative opening movement, the connecting rod does not rotate relative to the second external object, and the starting end of the second process section is the ending end of the first process section.

[0014] Optionally, in the above-mentioned rotating shaft device, the transmission belt includes a first belt body and a second belt body which are arranged crosswise between the first shaft body and the second shaft body.

[0015] Optionally, in the above-mentioned rotating shaft device, the transmission belt includes a covering body connected to the second shaft body, and an end of the first belt body away from the first shaft body and an end of the second belt body away from the first shaft body are connected through the covering body.

[0016] Optionally, in the above-mentioned rotating shaft device, one end of the first belt body away from the second shaft body and one end of the second belt body away from the second shaft body are both fixedly connected to the first shaft body.

[0017] Optionally, in the above-mentioned rotating shaft device, one end of the first belt body away from the second shaft body is fixedly connected to a first area on the surface of the first shaft body, and one end of the second belt body away from the second shaft body is fixedly connected to a second area on the surface of the first shaft body; the first area and the second area are staggered in the axial direction of the first shaft body, or the first area and the second area are located at the same position on the circumference of the first shaft body.

[0018] An electronic device, comprising:

[0019] first ontology;

[0020] Second entity;

[0021] A rotating shaft device, connecting the first body and the second body, so that the first body and the second body can realize relative opening and closing movements;

[0022] Wherein, the rotating shaft device is a rotating shaft device disclosed in any one of the above items.

[0023] Optionally, in the above electronic device, the first body and / or the second body is provided with a receiving groove, and when the first body and the second body are buckled together, the rotating shaft device is hidden in the receiving groove.

[0024] Optionally, in the above electronic device, the first body is hinged to the first shaft, the second body is fixedly connected to the second shaft, and the first body and the second body pass through a second relative angle during the process of opening from the first relative angle to the maximum relative angle;

[0025] In the process from the first relative angle to the second relative angle, the first shaft body and the second shaft body rotate synchronously and in opposite directions relative to the first body, and when reaching the second relative angle, the first stop structure provided on the connecting rod abuts against the first body, and the second stop structure provided on the second body abuts against the connecting rod;

[0026] In the process from the second relative angle to the maximum relative angle, the second body and the connecting rod rotate synchronously and in the same direction relative to the first body based on the abutment between the second stop structure and the connecting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0028] Figure 1 is a schematic diagram of a first state of a rotating shaft device provided in an embodiment of the present application;

[0029] Figure 2 yes Figure 1 The schematic diagram of the rotating shaft device shown is after removing a connecting rod;

[0030] Figure 3 is a schematic diagram of a second state of the rotating shaft device provided in an embodiment of the present application;

[0031] Figure 4 is a partial schematic diagram of an electronic device provided in an embodiment of the present application;

[0032] Figures 5 to 8 is a schematic diagram of a process in which a first body and a second body of an electronic device provided by an embodiment of the present application open to each other;

[0033] Fig. 9 The electronic device provided by the embodiment of the present application reaches the state where the first body and the second body are opened mutually. Figure 7 A partial schematic diagram of the state shown;

[0034] Fig.10 is with Fig. 9 The three-dimensional structure shown corresponds to the front view.

[0035] The markings in the figure are:

[0036] 1. First shaft; 11. Limiting platform; 2. Transmission belt; 21. First belt body; 22. Second belt body; 23. Envelope; 3. Connecting rod; 31. First connecting part; 32. Second connecting part; 33. First limiting structure; 4. Second shaft; 5. First connecting member; 51. First winding sheet; 6. Second connecting member; 61. Second winding sheet; 7. First body; 8. Second body; 81. Accommodating groove. DETAILED DESCRIPTION

[0037] The present application provides a hinge device, which can achieve large-angle opening and closing with a smaller thickness, which is conducive to the lightweight design of electronic equipment.

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] See also Figure 1 to Figure 3 The embodiment of the present application provides a shaft device, including a first shaft body 1, a second shaft body 4, a connecting rod 3 and a transmission belt 2, wherein the first shaft body 1 and the second shaft body 4 meet the parallel condition, that is, the axis of the first shaft body 1 and the axis of the second shaft body 4 are parallel to each other, the first shaft body 1 and the second shaft body 4 are connected by both the connecting rod 3 and the transmission belt 2, the first shaft body 1 is fixedly connected to the connecting rod 3, and the second shaft body 4 is rotationally connected to the connecting rod 3, and the first shaft body 1 and the second shaft body 4 can rotate synchronously in opposite directions based on the transmission belt 2, that is, at least in a certain movement stage of the complete opening and closing movement realized by the shaft device, the first shaft body 1 and the second shaft body 4 rotate simultaneously but in opposite directions under the transmission action of the transmission belt 2. The shaft device of the present application is a double-axis structure, which can easily realize large-angle opening and closing. At the same time, the transmission belt 2 can be arranged in a smaller space more conveniently, so the overall size of the shaft device can be made thinner. In this way, the shaft device of the present application can realize large-angle opening and closing with a smaller thickness, which is conducive to the lightweight design of electronic equipment.

[0040] like Figure 2 As shown, in order to realize the fixed connection between the first shaft body 1 and the connecting rod 3, a limiting platform 11 is provided at the end of the first shaft body 1 in this embodiment. The setting of the limiting platform 11 makes the cross section of the end of the first shaft body 1 non-circular, as shown in FIG. Figure 3 As shown, the first connecting portion 31 of the connecting rod 3 is provided with a mounting hole matching the non-circular end of the first shaft body 1. After the connecting rod 3 is assembled to the first shaft body 1, the connecting rod 3 and the first shaft body 1 cannot rotate relative to each other, thereby achieving the desired fixed connection between the first shaft body 1 and the connecting rod 3 of the present application. Of course, in other embodiments, the fixed connection between the first shaft body 1 and the connecting rod 3 can also be achieved by other means, such as welding the first shaft body 1 and the connecting rod 3, or integrally forming the first shaft body 1 and the connecting rod 3.

[0041] like Figure 3As shown, in this embodiment, the second connecting portion 32 of the connecting rod 3 is provided with a mounting hole matching the circular end of the second shaft body 4. After the connecting rod 3 is assembled on the second shaft body 4, the connecting rod 3 and the second shaft body 4 can rotate relative to each other. In a preferred embodiment, the transmission belt 2 includes a first belt body 21 and a second belt body 22 arranged crosswise between the first shaft body 1 and the second shaft body 4. It is easy to understand that the transmission belt 2 relies on tension to achieve transmission. When the second shaft body 4 rotates clockwise around its own axis as an active member, the second shaft body 4 drives the first shaft body 1 to rotate counterclockwise around its own axis through the first belt body 21, and when the second shaft body 4 rotates counterclockwise around its own axis as an active member, the second shaft body 4 drives the first shaft body 1 to rotate clockwise around its own axis through the second belt body 22. In this way, whether the second shaft body 4 rotates clockwise around its own axis or counterclockwise around its own axis, it can drive the first shaft body 1 to rotate synchronously in the opposite direction.

[0042] On the basis that the transmission belt 2 includes the first belt body 21 and the second belt body 22 arranged in a cross pattern, it is further preferred that the transmission belt 2 includes a coating body 23 that is coated and connected with the second shaft body 4, and the end of the first belt body 21 away from the first shaft body 1 and the end of the second belt body 22 away from the first shaft body 1 are connected through the coating body 23, that is, the first belt body 21 and the second belt body 22 are connected as a whole through the coating body 23. The second shaft body 4 can drive the first belt body 21 and the second belt body 22 through the action force between the second shaft body 4 and the coating body 23, for example, the second shaft body 4 drives the first belt body 21 and the second belt body 22 by the friction between the second shaft body 4 and the coating body 23, or the transmission belt 2 can be set as a toothed belt structure, and the second shaft body 4 drives the first belt body 21 and the second belt body 22 by the tooth meshing structure between the second shaft body 4 and the coating body 23. In other embodiments, the end of the first belt body 21 away from the first shaft body 1 and the end of the second belt body 22 away from the first shaft body 1 can also be fixedly connected to the second shaft body 4 respectively, so that when the second shaft body 4 rotates, a pulling force is directly applied to the first belt body 21 or the second belt body 22 to achieve driving.

[0043] like Figure 3As shown, in this embodiment, the connection mode between the transmission belt 2 and the first shaft body 1 is different from the connection mode between the transmission belt 2 and the second shaft body 4, and the end of the first belt body 21 away from the second shaft body 4 and the end of the second belt body 22 away from the second shaft body 4 are both fixedly connected to the first shaft body 1. Of course, in other embodiments, the transmission belt 2 can be configured to be connected to the first shaft body 1 and the second shaft body 4 respectively through the same connection mode, for example, the transmission belt 2 and the first shaft body 1 and the second shaft body 4 are both connected in a wrapping manner, that is, the first part of the transmission belt 2 is wrapped around the first shaft body 1, and the second part of the transmission belt 2 (such as the aforementioned wrapping body 23) is wrapped around the second shaft body 4. For another example, the transmission belt 2 and the first shaft body 1 and the second shaft body 4 are both connected in a directly fixed manner, that is, the two ends of the first belt body 21 are directly fixedly connected to the first shaft body 1 and the second shaft body 4, respectively, and the two ends of the second belt body 22 are directly fixedly connected to the first shaft body 1 and the second shaft body 4, respectively.

[0044] On the basis that the first belt body 21 and the second belt body 22 are both fixedly connected to the first shaft body 1 at one end away from the second shaft body 4, it is further preferred that the end of the first belt body 21 away from the second shaft body 4 is fixedly connected to the first area of ​​the surface of the first shaft body 1, and the end of the second belt body 22 away from the second shaft body 4 is fixedly connected to the second area of ​​the surface of the first shaft body 1. For example, a portion of the first belt body 21 is attached to the first area of ​​the surface of the first shaft body 1 and fixed to the first area with glue or rivets, and a portion of the second belt body 22 is attached to the second area of ​​the surface of the first shaft body 1 and fixed to the second area with glue or rivets. Specifically, there are multiple options for the positions of the first area and the second area on the surface of the first shaft body 1, such as Figure 3 As shown, in a preferred embodiment, the first region and the second region are staggered in the axial direction of the first shaft body 1, that is, the first region and the second region have no overlapping portion in a direction parallel to the axis of the first shaft body 1. Further preferably, the first region and the second region are located at the same position in the circumferential direction of the first shaft body 1, that is, the first region and the second region are located on the same side of the axis of the first shaft body 1.

[0045] In specific practical applications, the first shaft body 1 and the second shaft body 4 are respectively used to connect with the first external object and the second external object (such as the first body 7 and the second body 8 of the electronic device described later) that realize relative opening and closing movements through the rotating shaft device. In a preferred embodiment, the connecting rod 3 and / or the first shaft body 1 are provided with a first limiting structure 33. In the first process segment of the relative opening movement, the rotation direction of the connecting rod 3 relative to the first external object is opposite to the rotation direction of the second external object relative to the first external object. The first limiting structure 33 is used to engage with the first external object at the end of the first process segment. It should be noted that the complete process of the relative opening movement may include only the above-mentioned first process segment, or may include other process segments in addition to the above-mentioned first process segment, that is, the stroke of the first process segment is less than or equal to the opening and closing stroke that the rotating shaft device can provide. The end end of the first process segment refers to the end point of the opening movement in this process segment (i.e., the movement stage). Figures 5 to 8 The process of opening the second body 8 relative to the first body 7 is shown as an example. Figure 5 The status shown opens to Figure 7 The state shown can be called the first process stage, then Figure 5 The state shown is the beginning of the first process segment. Figure 7 The state shown is the end of the first process segment. It is easy to understand that since the opening movement and the closing movement are in opposite directions, Figure 7 The status shown is closed to Figure 5 During the closing process of the state shown, Figure 7 The state shown becomes the beginning of this movement phase. Figure 5 The state shown becomes the end of this movement phase.

[0046] like Figure 3 and Figure 4 As shown, in this embodiment, the first limiting structure 33 is arranged on the first connecting portion 31 of the connecting rod 3. At the end of the first process section of the relative opening movement, the first limiting structure 33 and the first body 7 connected to the first shaft body 1 form a Fig. 9 and Fig.10 The illustrated snap-fit ​​will limit the movement of the connecting rod 3 relative to the first body 7. Fig.10 It is easy to understand that, since the connecting rod 3 and the first shaft body 1 are fixedly connected together, the first limiting structure 33 can also be arranged on the first shaft body 1, as long as it can play the above-mentioned clamping role.

[0047] Further preferably, the connecting rod 3 is provided with a second limiting structure, and the second limiting structure is used to engage with the second external object at the end of the first process segment; in the second process segment of the relative opening movement, the connecting rod 3 does not rotate relative to the second external object, and the starting end of the second process segment is the end end of the first process segment. That is, the starting end of the second process segment corresponds to the same position as the end end of the first process segment, so that Figures 5 to 8 The process of opening the second body 8 relative to the first body 7 is shown as an example. Figure 5 The status shown opens to Figure 7 The state shown can be called the first process stage, which is composed of Figure 7 The status shown opens to Figure 8 The state shown can be called the second process stage, then Figure 7 The state shown is both the end of the first process segment and the beginning of the second process segment. Since the second limiting structure provided on the connecting rod 3 forms a clamping connection with the second external object at the end of the first process segment, the clamping connection will limit the second external object connected to the second shaft body 4 from continuing to rotate relative to the connecting rod 3 in the opening direction, so in the subsequent second process segment, the connecting rod 3 does not rotate relative to the second external object. In other words, Figure 7 The status shown opens to Figure 8 During the state shown, the second body 8, the second shaft body 4, the connecting rod 3 and the first shaft body 1 rotate clockwise around the axis of the first shaft body 1 as a whole. Figure 4 The second limiting structure can be the side surface of the connecting rod 3, which abuts against the edge of the second body 8 close to the first body 7, so as to achieve the clamping connection between the second limiting structure and the second body 8. Of course, the second limiting structure can also be adaptively set to other forms according to the specific structure of the second external object connected to the second shaft body 4, as long as it can play the above-mentioned clamping role.

[0048] See also Figures 4 to 10 The present application also provides an electronic device, including a first body 7, a second body 8, and a hinge device connecting the first body 7 and the second body 8, wherein the hinge device is a hinge device as disclosed in any of the above embodiments, and the first body 7 and the second body 8 realize relative opening and closing movements based on the hinge device.

[0049] In a preferred embodiment, the first body 7 is hinged to the first shaft body 1, and the second body 8 is fixedly connected to the second shaft body 4. The process of the first body 7 and the second body 8 opening from the first relative angle to the maximum relative angle passes through the second relative angle. In the process from the first relative angle to the second relative angle, the first shaft body 1 and the second shaft body 4 rotate synchronously and in opposite directions relative to the first body 7. When the second relative angle is reached, the first stop structure provided on the connecting rod 3 abuts against the first body 7, and the second stop structure provided on the second body 8 (for example, the edge of the second body 8 close to the first body 7) abuts against the connecting rod 3. In the process from the second relative angle to the maximum relative angle, the second body 8 and the connecting rod 3 rotate synchronously and in the same direction relative to the first body 7 based on the abutment between the second stop structure and the connecting rod 3. Figures 5 to 8 As shown, the first relative angle can be set to be such that the first body 7 and the second body 8 are Figure 5 The second relative angle can be set to be such that the first body 7 and the second body 8 are in a closed state. Figure 7 The angle between the two in the open state is, for example, 90° or 110°. The maximum relative angle is set to the first body 7 and the second body 8 are Figure 8 The angle between the two in the open state is, for example, 135°, 150° or 160°.

[0050] Figure 6 The operation principle of the process from the first relative angle to the second relative angle is shown. In a specific application scenario, the second body 8 is the screen part of the laptop computer, and the first body 7 is the host part of the laptop computer. When the user opens the second body 8, the second body 8 and the second shaft body 4 are rotated around the axis of the second shaft body 4. Figure 6 The first shaft body 1 and the second shaft body 4 are connected by the transmission belt 2, so the second shaft body 4 rotating clockwise drives the first shaft body 1 to rotate counterclockwise through the transmission belt 2, that is, the first shaft body 1 and the second shaft body 4 rotate synchronously and in opposite directions relative to the first body 7. At the same time, since the connecting rod 3 is fixedly connected to the first shaft body 1, the connecting rod 3 rotates counterclockwise with the first shaft body 1. When the second body 8 is opened to Figure 7 In the state shown, the first stop structure of the connecting rod 3 abuts against the first body 7 in the manner as shown in FIG. Fig. 9 and Fig.10 Moreover, the edge of the second body 8 close to the first body 7 is now in contact with the connecting rod 3, and the contact method is as follows Figure 4 As shown, in the process from the second relative angle to the maximum relative angle, the second body 8, the second shaft body 4, the connecting rod 3 and the first shaft body 1 as a whole are relative to the first body 7 along Figure 7The second body 8 and the connecting rod 3 rotate in the clockwise direction relative to the first body 7, that is, the second body 8 and the connecting rod 3 rotate synchronously and in the same direction relative to the first body 7. The closing movement of the second body 8 and the first body 7 is the reverse process of the above-mentioned opening process. The movement of each component during the closing movement can be understood by referring to the above description of the opening movement, which will not be repeated in this article.

[0051] In specific practical applications, the second body 8 can be set as a bracket of an electronic device. For example, the electronic device is a tablet computer, the first body 7 is the host part of the tablet computer, and the second body 8 is a foldable bracket set on the back of the host part.

[0052] like Figure 3 , Figure 4 and Fig.10 As shown, in order to facilitate the connection with the first body 7 and the second body 8, the rotating shaft device includes a first connecting member 5 and a second connecting member 6, wherein the first connecting member 5 is used to connect the first shaft body 1 and the first body 7, and the second connecting member 6 is used to connect the second shaft body 4 and the second body 8. Specifically, the first connecting member 5 can be provided with a first flat plate and a first winding plate 51, the first winding plate 51 is sleeved on the first shaft body 1 to form a pivot connection with the first shaft body 1, and the first flat plate is fixedly connected to the first body 7 by fasteners such as screws. The second connecting member 6 can be provided with a second flat plate and a second winding plate 61, the second winding plate 61 is sleeved on the second shaft body 4 and presses the second shaft body 4 to form a fixed connection, and the second flat plate is fixedly connected to the second body 8 by fasteners such as screws. As shown Figure 3 As shown, in order to make the movement of the rotating shaft device more stable and reliable, in this embodiment, a transmission belt 2 and a connecting rod 3 are provided on both sides of the first winding plate 51 and the second winding plate 61. Figure 4 As shown, in a preferred embodiment, the first body 7 and / or the second body 8 is provided with a receiving groove 81. When the first body 7 and the second body 8 are buckled together, the hinge device is hidden in the receiving groove 81, so that the thickness of the electronic device in the closed state can be smaller.

[0053] In this specification, each part of the structure is described in a progressive manner, and the structure of each part focuses on the differences from the existing structure. The overall and partial structures of the hinge device and the electronic device can be obtained by combining the structures of the above multiple parts.

[0054] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rotating shaft device, characterized in that: include: The first axis; A second axis that is parallel to the first axis; A connecting rod connecting the first shaft body and the second shaft body; A transmission belt connecting the first shaft and the second shaft; The first shaft is fixedly connected to the connecting rod, the second shaft is rotatably connected to the connecting rod, and the first shaft and the second shaft can rotate synchronously in opposite directions based on the transmission belt.

2. The rotating shaft device according to claim 1, characterized in that: The first shaft body and the second shaft body are respectively used to connect with a first external object and a second external object to achieve relative opening and closing movements through the rotating shaft device, and the connecting rod and / or the first shaft body are provided with a first limiting structure; In the first process section of the relative opening movement, the rotation direction of the connecting rod relative to the first external object is opposite to the rotation direction of the second external object relative to the first external object, and the first limiting structure is used to engage with the first external object at the end end of the first process section.

3. The rotating shaft device according to claim 2, characterized in that: The connecting rod is provided with a second limiting structure, and the second limiting structure is used to be clamped with the second external object at the end of the first process section; In the second process section of the relative opening movement, the connecting rod does not rotate relative to the second external object, and the starting end of the second process section is the ending end of the first process section.

4. The rotating shaft device according to any one of claims 1 to 3, characterized in that: The transmission belt includes a first belt body and a second belt body which are arranged crosswise between the first shaft body and the second shaft body.

5. The rotating shaft device according to claim 4, characterized in that: The transmission belt comprises a covering body which is connected to the second shaft body, and an end of the first belt body away from the first shaft body and an end of the second belt body away from the first shaft body are connected through the covering body.

6. The rotating shaft device according to claim 5, characterized in that: One end of the first belt body away from the second shaft body and one end of the second belt body away from the second shaft body are both fixedly connected to the first shaft body.

7. The rotating shaft device according to claim 6, characterized in that: One end of the first belt body away from the second shaft body is fixedly connected to a first area on the surface of the first shaft body, and one end of the second belt body away from the second shaft body is fixedly connected to a second area on the surface of the first shaft body; the first area and the second area are staggered in the axial direction of the first shaft body, or the first area and the second area are located at the same position on the circumference of the first shaft body.

8. An electronic device, characterized in that: include: first ontology; Second entity; A rotating shaft device, connecting the first body and the second body, so that the first body and the second body can realize relative opening and closing movements; Wherein, the rotating shaft device is the rotating shaft device as described in any one of claims 1 to 7.

9. The electronic device according to claim 8, characterized in that: The first body and / or the second body is provided with a receiving groove, and when the first body and the second body are buckled together, the rotating shaft device is hidden in the receiving groove.

10. The electronic device according to claim 8, characterized in that: The first body is hinged to the first shaft, the second body is fixedly connected to the second shaft, and the first body and the second body pass through a second relative angle during the process of opening from a first relative angle to a maximum relative angle; In the process from the first relative angle to the second relative angle, the first shaft body and the second shaft body rotate synchronously and in opposite directions relative to the first body, and when reaching the second relative angle, the first stop structure provided on the connecting rod abuts against the first body, and the second stop structure provided on the second body abuts against the connecting rod; In the process from the second relative angle to the maximum relative angle, the second body and the connecting rod rotate synchronously and in the same direction relative to the first body based on the abutment between the second stop structure and the connecting rod.

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