Connecting bracket, connecting structure and working machine

Abstract

The present application relates to the technical field of working machine, provide a kind of connecting bracket, connecting structure and working machine, connecting bracket includes support plate, first connecting plate, second connecting plate and torsion portion;First connecting plate and second connecting plate are located at the both ends of support plate respectively;The board surface of support plate and the board surface of first connecting plate and second connecting plate all exist angle, and support plate and first connecting plate and second connecting plate are connected by torsion portion;Torsion portion is formed by twisting a certain angle with respect to the plane where support plate is located as reference;When adjusting the connecting position, the board of different parts of connecting bracket is deformed along its thickness direction or the direction of pre-twisting, the rigidity of board in deformation direction is smaller, and deformation is easier;And the thickness direction of support plate and the thickness direction of first connecting plate, second connecting plate all exist angle, so three degrees of freedom of front and back, left and right, rotation can be realized, and the adjustment of connecting position is easier, improve the convenience of cover assembly.

Description

Technical Field

[0001] This invention relates to the technical field of work machinery, and more particularly to a connecting bracket, a connecting structure, and work machinery. Background Technology

[0002] Currently, slewing platforms are an important component of operating machinery such as excavators and cranes. Slewing platforms allow equipment to rotate 360 ​​degrees for operation, thus achieving a wider operating range and higher work efficiency. Slewing platform covers are components used to cover and protect the slewing platform of the operating machinery, enabling the machinery to adapt to harsh working environments.

[0003] In related technologies, the connection between the rotary platform and the cover is mainly achieved by a straight plate bracket. The two ends of the straight plate bracket are connected to the rotary platform and the cover through bolts and nuts, respectively, so as to realize the connection of the cover on the rotary platform.

[0004] Regarding the aforementioned technologies, the slewing platform of the construction machinery is generally manufactured using a welding process. This results in significant deformation after welding, making it difficult to guarantee dimensional accuracy and prone to positioning deviations. When positioning deviations occur, the connection position of the straight plate support needs to be adjusted. However, the straight plate support has high rigidity, making dimensional adjustments in the parallel direction extremely difficult. Furthermore, to cope with the harsh working environment of construction machinery, the covers installed on the platform are mostly made using a thin-plate stretching forming process. After forming, they have good rigidity and are not easily deformed, thus making it difficult to adjust the connection position of the covers. This leads to significant difficulties in adjustment when the slewing platform and the covers are misaligned, hindering assembly and making rectification time-consuming and labor-intensive. Summary of the Invention

[0005] This invention provides a connecting bracket, a connecting structure, and a working machine to solve the problem of difficulty in adjusting the connection position of the rotary platform and the cover in the prior art, which leads to time-consuming and laborious assembly and rectification. It enables more convenient adjustment of the connection position and improves the ease of assembly of the cover on the rotary platform.

[0006] This invention provides a connecting bracket suitable for connecting two surfaces to be connected;

[0007] The connecting bracket includes a support plate, a first connecting plate, a second connecting plate, and a torsion section;

[0008] The first connecting plate and the second connecting plate are respectively located at both ends of the support plate;

[0009] The surface of the support plate forms an angle with the surfaces of the first connecting plate and the second connecting plate, and the support plate is connected to the first connecting plate and the second connecting plate by a torsion joint.

[0010] The torsion section is formed by twisting a certain angle relative to the plane where the support plate is located.

[0011] According to a connecting bracket provided by the present invention, the torsion angle of the torsion portion relative to the plane of the support plate is 90 degrees.

[0012] According to a connecting bracket provided by the present invention, one end of the first connecting plate is connected to the torsion portion, and the other end extends along the length direction L of the support plate.

[0013] According to a connecting bracket provided by the present invention, one end of the second connecting plate is connected to the torsion portion, and the extension direction of the other end forms an angle with the length direction L of the support plate.

[0014] According to a connecting bracket provided by the present invention, both the first connecting plate and the second connecting plate are provided with connecting holes, and,

[0015] A locking nut is fixedly connected to at least one of the first connecting plate and the second connecting plate, and the locking nut corresponds to the position of the connecting hole.

[0016] The present invention also provides a connection structure suitable for connecting two surfaces to be connected, the connection structure including a first connector, a second connector, and the connection bracket described above;

[0017] The first connecting plate of the connecting bracket is attached to one of the surfaces to be connected and fixedly connected by the first connecting piece;

[0018] The second connecting plate of the connecting bracket is attached to another surface to be connected and fixedly connected by the second connecting member.

[0019] According to a connection structure provided by the present invention, the first connecting member includes a first bolt and a first nut; the first bolt passes through one of the surfaces to be connected and the first connecting plate in sequence and is then locked by the first nut.

[0020] According to a connection structure provided by the present invention, the second connecting member includes a second bolt and a second nut; the second bolt passes through another surface to be connected and the second connecting plate in sequence and is then locked by the second nut.

[0021] According to a connection structure provided by the present invention, the first nut is fixedly connected to the first connecting plate, and / or the second nut is fixedly connected to the second connecting plate.

[0022] According to a connection structure provided by the present invention, the first connector further includes a first washer disposed between the surface to be connected and the first connecting plate.

[0023] According to a connection structure provided by the present invention, a second washer is further provided on the second bolt.

[0024] The present invention also provides a connection structure, including a rotating platform, a cover, and the connection bracket or the connection structure described above.

[0025] The two surfaces to be connected are formed on the rotary platform and the cover, respectively.

[0026] Beneficial effects:

[0027] I. The present invention provides a connecting bracket, connecting structure, and working machinery. When positioning deviations occur between the rotating platform and the cover, the connection position can be adjusted along the thickness direction of the first connecting plate or the thickness direction of the second connecting plate, the thickness direction of the support plate, and the torsion direction of the torsion part. Compared with the straight plate bracket in related technologies, the adjustment of the connection position is achieved by deforming the plates of different parts of the connecting bracket along their thickness direction or the pre-torsion direction, without deformation parallel to the plate surface. The plate stiffness is small in the deformation direction, and deformation is easier, making the adjustment of the connection position relatively simple. Since the thickness direction of the support plate has an angle with the thickness directions of the first and second connecting plates, it can be adjusted in three degrees of freedom: front-back, left-right, and rotation. The connection position can be conveniently adjusted in multiple directions, providing assembly convenience for the installation of the cover with good rigidity and improving production efficiency.

[0028] Second, by pre-fixing the locking nuts connected to the first connecting plate and / or the second connecting plate, the assembly difficulty can be reduced and the convenience of connecting the connecting bracket to the surface to be connected can be improved.

[0029] Third, the first and second connectors can improve the ease of connecting the connecting bracket to the rotating platform and the cover. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the connecting bracket provided in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the connection structure provided in an embodiment of the present invention.

[0033] Figure label:

[0034] 1. Support plate; 2. First connecting plate; 3. Second connecting plate; 4. Torsion part; 5. Rotating platform; 6. Cover; 7. First connecting piece; 70. First bolt; 71. First nut; 72. First washer; 8. Second connecting piece; 80. Second bolt; 81. Second nut; 82. Second washer. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0036] It should be noted that, in this embodiment, when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in the embodiments of this invention are for illustrative purposes only and are not intended to limit the invention.

[0037] To facilitate understanding of the connecting bracket, connecting structure, and working machinery provided by this invention, its application background is first explained. The rotary platform is an important component of the working machinery, and the cover is a component used to cover and protect the rotary platform, enabling the working machinery to adapt to harsh working environments. In related technologies, the rotary platform and the cover are mainly connected by a straight plate bracket. The parts of the straight plate bracket near both ends are respectively attached to the rotary platform and the cover, and are connected to the two by bolts and nuts to realize the assembly of the cover on the rotary platform.

[0038] However, in practical applications, it has been found that rotary platforms are generally manufactured using a welding process, which results in large deformation after welding, making it difficult to guarantee the accuracy of positioning dimensions and easily leading to positioning deviations. When positioning deviations occur, it is necessary to adjust the connection position of the straight plate bracket. In order to cope with the harsh working environment of the machinery, the cover parts are mostly made of thin plate stretching, which has high rigidity after forming and is not easily deformed. Therefore, it is not possible to adjust the connection position by changing the shape of the cover parts, but only by changing the shape of the straight plate bracket.

[0039] Straight plate brackets are relatively easy to deform along the direction perpendicular to their plate surface, and the connection position can be adjusted by bending the straight plate brackets back and forth. However, the stiffness is very high along the direction parallel to its plate surface, making deformation very difficult. Therefore, the straight plate brackets in related technologies can only adjust the connection position along one degree of freedom, that is, along the direction perpendicular to the plate surface of the straight plate bracket, which is difficult to meet the adjustment requirements. When the rotating platform and the cover are not aligned in the direction parallel to the plate surface of the straight plate bracket, the deformation of the straight plate bracket is very difficult, which makes adjustment very difficult, not conducive to assembly, and rectification is time-consuming and laborious.

[0040] Based on the above, the present invention provides a connecting bracket, a connecting structure, and a working machine to facilitate the adjustment of the connecting position and improve the ease of assembling the cover on the rotary platform.

[0041] The following is combined Figures 1-2 The present invention describes the connecting bracket, connecting structure, and operating machinery.

[0042] Reference Figure 1 and Figure 2 A connecting bracket is used to connect two surfaces to be connected. It includes a support plate 1, a first connecting plate 2, a second connecting plate 3, and a torsion part 4. The first connecting plate 2 and the second connecting plate 3 are located at opposite ends of the support plate 1, respectively, for attaching and connecting the two surfaces to be connected. The surface of the support plate 1 forms an angle with the surfaces of the first connecting plate 2 and the second connecting plate 3, such that the thickness direction of the support plate 1 forms an angle with the thickness directions of the first connecting plate 2 and the second connecting plate 3. The support plate 1 is connected to the first connecting plate 2 and the second connecting plate 3 via the torsion part 4. The torsion part 4 is formed by twisting at a certain angle relative to the plane of the support plate 1.

[0043] In practice, when connecting the rotary platform 5 and the cover 6, two surfaces to be connected are formed on the rotary platform 5 and the cover 6 respectively, so that the first connecting plate 2 is attached to and connects one of the rotary platform 5 and the cover 6, and the second connecting plate 3 is attached to and connects the other of the rotary platform 5 and the cover 6.

[0044] When there is a positioning deviation between the rotating platform 5 and the cover 6, bending the first connecting plate 2 or the second connecting plate 3 along the thickness direction can adjust the connection position in the thickness direction of the first connecting plate 2 or the second connecting plate 3; bending the support plate 1 along the thickness direction can adjust the connection position in the thickness direction of the first support plate 1; by rotating the torsion part 4, the first connecting plate 2 or the second connecting plate 3 can be rotated around the axis of the torsion part 4, thereby adjusting the connection position around the axis of the torsion part 4, and conveniently installing the cover 6 at different angles.

[0045] Compared to the straight plate brackets in related technologies, the adjustment of the connection position is achieved by deforming the plates of different parts of the connecting bracket along their thickness direction or in a pre-twisted direction, without deformation parallel to the plate surface. The plate stiffness is small in the deformation direction, making deformation easier and the adjustment of the connection position relatively simple. Since the thickness direction of the support plate 1 is at an angle to the thickness directions of the first connecting plate 2 and the second connecting plate 3, it can be adjusted in three degrees of freedom: front-back, left-right, and rotation. This allows for convenient adjustment of the connection position in multiple directions, providing assembly convenience for the installation of the rigid cover 6 and improving production efficiency.

[0046] It should be noted that, in order to ensure the support strength, the first connecting plate 2, the second connecting plate 3, the support plate 1 and the torsion part 4 of the connecting bracket all have a certain strength. Therefore, when adjusting the connection position, it is necessary to use manpower or tools to deform the plate at the corresponding position of the connecting bracket. The specific adjustment method can be selected according to the actual needs, and no specific restrictions are made in the embodiments of the present invention.

[0047] Understandably, in practical applications, one of the first connecting plate 2 and the second connecting plate 3 is often used as a reference to adjust the connection position of the other, without having to adjust the connection positions of both simultaneously. For example, when the first connecting plate 2 is used as a reference, the first connecting plate 2 is first connected to one of the surfaces to be connected. Then, based on the relative position of the connection point between the second connecting plate 3 and the other surface to be connected, the position of the second connecting plate 3 is adjusted so that the second connecting plate 3 fits and connects to the other surface to be connected. Conversely, the position of the first connecting plate 2 is adjusted.

[0048] Specifically, the material of the connecting bracket can be selected according to actual needs, as long as it meets the required support strength.

[0049] The method of forming the torsion part 4, its location, and its torsion angle can be selected according to actual needs. For example, a torsion machine or twister can be used to apply torque to a specific part of the connecting bracket, causing that specific part to rotate and twist, thus forming the torsion part 4. In addition, heat treatment processes can be combined to achieve the specific processing and performance requirements of the torsion part 4.

[0050] By controlling the position of the screw, the required rigidity of the connecting bracket in different directions can be obtained, which facilitates installation while ensuring the strength of the bracket during use.

[0051] By controlling the torsion angle, cover parts 6 at different angles can be easily installed.

[0052] Therefore, the formation method, formation position and torsion angle of the torsion part 4 can be flexibly adjusted according to the actual stiffness and connection angle requirements.

[0053] In this embodiment, the torsion angle of the torsion part 4 relative to the plane of the support plate 1 is 90 degrees, so that the first connecting plate 2 and the second connecting plate 3 are both connected by a 90-degree torsion relative to the support plate 1.

[0054] Specifically, the structure of the first connecting plate 2 and the second connecting plate 3 and their positions relative to the support plate 1 can be adapted to the arrangement of the two surfaces to be connected. It is only necessary to make the first connecting plate 2 and the second connecting plate 3 fit into the two surfaces to be connected respectively.

[0055] In this embodiment, refer to Figure 1 One end of the first connecting plate 2 is connected to the torsion part 4, and the other end extends along the length direction L of the support plate 1; one end of the second connecting plate 3 is connected to the torsion part 4, and the extension direction of the other end is at an angle to the length direction L of the support plate 1. In this way, the first connecting plate 2 and the second connecting plate 3 can be attached and connected to two surfaces to be connected that are arranged at an angle.

[0056] Of course, based on the specific shape and structure of the surfaces to be connected, as well as the space constraints between the two surfaces to be connected, the specific shapes of the first connecting plate 2 and the second connecting plate 3 can be adaptively adjusted, as long as the connection requirements are met.

[0057] Specifically, refer to Figure 1 Both the first connecting plate 2 and the second connecting plate 3 are provided with connecting holes, which are used to correspond to the mounting holes reserved on the surfaces to be connected, so as to facilitate the connection using bolts and other connecting components.

[0058] Specifically, a locking nut can be fixed on at least one of the first connecting plate 2 and the second connecting plate 3, and the nut should be aligned with the position of the connecting hole. In this way, during connection, the connection between the connecting bracket and the surface to be connected can be completed simply by passing the bolt through the surface to be connected and the connecting hole and then threading it with the nut.

[0059] Specifically, the locking nut is welded and fixed to the corresponding first connecting plate 2 or second connecting plate 3.

[0060] The connection structure provided by the present invention is described below. The connection structure described below can be referred to in correspondence with the connection bracket described above.

[0061] Reference Figure 1 and Figure 2A connection structure is suitable for connecting two surfaces to be connected, such as two surfaces formed on a rotary platform 5 and a cover 6 respectively; the connection structure includes a first connector 7, a second connector 8, and the aforementioned connection bracket; the first connecting plate 2 of the connection bracket is attached to one of the surfaces to be connected and fixedly connected by the first connector 7; the second connecting plate 3 of the connection bracket is attached to the other surface to be connected and fixedly connected by the second connector 8.

[0062] The specific structure of the first connector 7 and the second connector 8 can be selected according to actual needs, as long as the connection between the first connecting plate 2 and the second connecting plate 3 and the two surfaces to be connected can be achieved.

[0063] In one specific embodiment, refer to Figure 1 and Figure 2 The first connecting member 7 includes a first bolt 70 and a first nut 71. The first bolt 70 passes through one of the surfaces to be connected and the first connecting plate 2 in sequence and is then locked by the first nut 71, thereby realizing the connection and fixation between the first connecting plate 2 and one of the surfaces to be connected.

[0064] Specifically, a first washer 72 is fitted on the first bolt 70 to ensure the connection effect between the first connecting plate 2 and the surface to be connected.

[0065] In one specific embodiment, refer to Figure 1 and Figure 2 The second connecting member 8 includes a second bolt 80 and a second nut 81. The second bolt 80 passes through the other surface to be connected and the second connecting plate 3 in sequence and is then locked by the second nut 81, thereby realizing the connection and fixation between the second connecting plate 3 and the other surface to be connected.

[0066] Specifically, a second washer 82 is fitted on the second bolt 80 to ensure the connection effect between the second connecting plate 3 and the surface to be connected.

[0067] Of course, the first connector 7 and the second connector 8 are not limited to the structures listed above. Based on the actual application scenario and connection requirements, other types of connecting elements can be used as long as they can achieve the connection between the connecting bracket and the surface to be connected.

[0068] Specifically, in order to improve the convenience of connection, the first nut 71 can be fixedly connected to the first connecting plate 2. In this way, the first nut 71 is formed as the locking nut described above. After the first bolt 70 passes through the surface to be connected and the connecting hole, it can be directly threaded to the first nut 71 to realize the connection and fixation between the first connecting plate 2 and the surface to be connected.

[0069] Alternatively, the second nut 81 can be fixedly connected to the second connecting plate 3. In this way, the second nut 81 is formed as the locking nut described above. After the second bolt 80 passes through the surface to be connected and the connecting hole, it can be directly threaded to the second nut 81 to realize the connection and fixation between the second connecting plate 3 and the other surface to be connected.

[0070] The working machinery provided by the present invention is described below. The working machinery described below can be referred to in correspondence with the connecting bracket and connecting structure described above.

[0071] Reference Figure 2 A working machine includes a rotary platform 5, a cover 6, and the aforementioned connecting bracket or connecting structure; two surfaces to be connected are respectively formed on the rotary platform 5 and the cover 6, the first connecting plate 2 of the connecting bracket is attached to the cover 6, and the second connecting plate 3 of the connecting bracket is attached to the rotary platform 5.

[0072] The first nut 71 is fixedly connected to the first connecting plate 2 to form the locking nut described above. The first bolt 70 passes through the cover 6 and the first connecting plate 2 in sequence and is threadedly connected to the first nut 71, thereby realizing the connection and fixation between the connecting bracket and the cover 6 and reducing the assembly difficulty of the connecting bracket and the cover 6.

[0073] The second nut 81 and the second connecting plate 3 are separately set. The second bolt 80 passes through the rotary platform 5 and the second connecting plate 3 in sequence and is then locked by the second nut 81, so as to realize the connection and fixation between the connecting bracket and the rotary platform 5 and reduce the assembly difficulty of the connecting bracket and the rotary platform 5.

[0074] In practical applications, mounting holes are drilled at the installation position of the rotary platform 5 with the rotation center as the positioning reference. Then, the second connecting plate 3 is aligned with the installation position of the rotary platform 5. The second bolt 80 is passed through the rotary platform and the second connecting plate 3 in sequence and then locked with the second nut 81. Then, the cover 6 is hoisted and the position of the first connecting plate 2 is adjusted according to the actual position of the mounting holes on the cover 6.

[0075] When there is a positioning deviation between the rotating platform 5 and the cover 6, different parts of the connecting bracket are adjusted according to different application scenarios to achieve the adjustment of the connection position: the direction facing or away from the cover 6 is set as the front-back direction, and the other direction perpendicular to the front-back direction is the left-right direction. When the first connecting plate 2 is bent along the thickness direction, the first connecting plate 2 can move towards or away from the cover 6 to achieve the front-back adjustment of the connection position; when the support plate 1 is bent along the thickness direction, the first connecting plate 2 can swing left and right to achieve the left-right adjustment of the connection position; by rotating the torsion part 4, the first connecting plate 2 can be rotated around the central axis of the torsion part 4 to adjust the relative angle between the first connecting plate 2 and the cover 6, which is suitable for convenient installation of the cover 6 at different angles.

[0076] With the connecting bracket, connecting structure, and operating machinery provided by the embodiments of the present invention, when the rotating platform 5 and the cover 6 have positioning deviations, the connection position can be adjusted along the thickness direction of the first connecting plate 2, the thickness direction of the second connecting plate 3, the thickness direction of the support plate 1, and the torsion direction of the torsion part 4. Compared with the straight plate bracket in the related technology, the adjustment of the connection position is achieved by deforming the plates of different parts of the connecting bracket along their thickness direction or the direction of pre-torsion, without deformation parallel to the plate surface. The stiffness of the plate in the deformation direction is small, making the adjustment of the connection position relatively convenient. Since the thickness direction of the support plate 1 has an angle with the thickness directions of the first connecting plate 2 and the second connecting plate 3, it can be adjusted in three degrees of freedom: front and back, left and right, and rotation. This enables convenient adjustment of the connection position, provides assembly convenience for the installation of the cover 6 with good stiffness, and improves production efficiency.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A connecting bracket, characterized in that, Suitable for connecting two surfaces to be connected; The connecting bracket includes a support plate, a first connecting plate, a second connecting plate, and a torsion section; The first connecting plate and the second connecting plate are respectively located at both ends of the support plate; The surface of the support plate forms an angle with the surfaces of the first connecting plate and the second connecting plate, and the support plate is connected to the first connecting plate and the second connecting plate by a torsion joint. The torsion section is formed by twisting at a certain angle relative to the plane where the support plate is located, so that the connecting bracket has three degrees of freedom of adjustment: front-back, left-right, and rotation.

2. The connecting bracket according to claim 1, characterized in that, One end of the first connecting plate is connected to the torsion part, and the other end extends along the length direction L of the support plate.

3. The connecting bracket according to claim 2, characterized in that, One end of the second connecting plate is connected to the torsion part, and the extension direction of the other end forms an angle with the length direction L of the support plate.

4. The connecting bracket according to claim 1, characterized in that, The torsion angle of the torsion part relative to the plane of the support plate is 90 degrees.

5. The connecting bracket according to claim 1, characterized in that, Both the first connecting plate and the second connecting plate are provided with connecting holes, and, A locking nut is fixedly connected to at least one of the first connecting plate and the second connecting plate, and the locking nut corresponds to the position of the connecting hole.

6. A connection structure, characterized in that, Suitable for connecting two surfaces to be connected, the connection structure includes a first connector, a second connector, and a connection bracket as described in any one of claims 1-4; The first connecting plate of the connecting bracket is attached to one of the surfaces to be connected and fixedly connected by the first connecting piece; The second connecting plate of the connecting bracket is attached to another surface to be connected and fixedly connected by the second connecting piece.

7. The connection structure according to claim 6, characterized in that, The first connector includes a first bolt and a first nut; the first bolt passes through one of the surfaces to be connected and the first connecting plate in sequence and is then locked by the first nut.

8. The connection structure according to claim 7, characterized in that, The second connector includes a second bolt and a second nut; the second bolt passes through another surface to be connected and the second connecting plate in sequence and is then locked by the second nut.

9. The connection structure according to claim 8, characterized in that, The first nut is fixedly connected to the first connecting plate, and / or the second nut is fixedly connected to the second connecting plate.

10. A type of operating machinery, characterized in that, It includes a rotating platform, a cover, and a connecting bracket as described in any one of claims 1-5 or a connecting structure as described in any one of claims 6-9; The two surfaces to be connected are formed on the rotary platform and the cover, respectively.

Images