Central pivot apparatus and working machine

Abstract

The utility model discloses a central pivot device and operation machine, central pivot device includes connecting axle and connecting assembly, and one end of connecting axle is used for with the rotary platform of operation machine is connected, and the other end of connecting axle is used for setting through the chassis of operation machine, connecting assembly includes connecting key and compression ring, and connecting key is used for setting through connecting axle and chassis transversely, and compression ring is set on connecting axle, and the side of compression ring and connecting key is away from chassis abuts. Connecting key transversely extends and sets and sets through chassis and connecting axle in proper order to limit connecting axle relative to chassis, prevent connecting axle from rotating relative to chassis, and the assembly convenience has been improved greatly, and the compression ring is set on connecting axle, and connecting key is located between chassis and compression ring, so that compression ring can press connecting key on chassis, effectively prevent connecting axle axial movement, and then can stably fix connecting axle on chassis, improve the assembly stability of connecting axle and chassis.

Description

Technical Field

[0001] This utility model belongs to the field of central pivot installation technology, specifically relating to a central pivot device and operating machinery. Background Technology

[0002] In operating machinery, the central pivot, as the core rotating component connecting the slewing platform and the base frame, is crucial to the overall performance of the machine. Currently, to enhance connection strength, interference fits are commonly used when connecting the central pivot to the base frame. However, interference fits present significant challenges in actual assembly, requiring a freezing process to shrink the central pivot's dimensions for installation. This assembly process is cumbersome and complex, demanding high technical standards and presenting significant installation difficulties. Furthermore, existing technologies typically use clamp structures for auxiliary fixation of the central pivot. However, because clamp structures require pre-installed assembly gaps, the gap between the clamp and the central pivot is relatively large. This not only weakens the central pivot's fixing effect but also affects the overall assembly stability. After prolonged operation, the central pivot is prone to loosening, thus impacting the operating reliability and service life of the operating machinery. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies, this utility model provides a central pivot device and working machine, which aims to solve the technical problems of cumbersome and complex assembly of the central pivot and poor assembly stability.

[0004] To achieve the above objectives, this utility model provides a central pivot device, which includes: A connecting shaft, one end of which is used to connect to the rotary platform of the working machinery, and the other end of which is used to pass through the base frame of the working machinery; The connecting assembly includes a connecting key and a clamping ring. The connecting key is used to pass laterally through the connecting shaft and the base frame. The clamping ring is sleeved on the connecting shaft and abuts against the side of the connecting key facing away from the base frame.

[0005] In this embodiment of the utility model, the connecting shaft includes an extension section and a first threaded section. One end of the extension section is used to connect with the rotary platform, and the other end of the extension section is connected with the first threaded section. The extension section is used for the base frame to be fitted. The first threaded section extends out relative to the base frame. The connecting key is used to pass laterally through the extension section and the base frame. The clamping ring is a clamping nut. The clamping nut is fitted on the first threaded section and threadedly connected to the first threaded section.

[0006] In this embodiment of the utility model, a connecting hole is provided on the extension section, and a connecting key is used to pass through the connecting groove on the base frame and extend into the connecting hole.

[0007] In this embodiment of the invention, the connecting assembly further includes a connecting screw, which passes through the connecting key and is used for threaded connection in a threaded hole on the bottom wall of the connecting groove.

[0008] In this embodiment of the utility model, the connecting shaft further includes a second threaded section, which is connected to the end of the extension section away from the first threaded section, and the extension section is used for the rotary platform to be fitted. The second threaded section extends out relative to the rotary platform. The central pivot device further includes a mounting component, which includes a limiting nut, which is fitted onto the second threaded section and threadedly connected to the second threaded section.

[0009] In this embodiment of the utility model, the mounting assembly further includes a spherical washer, which is sleeved on the second threaded section and located between the limiting nut and the rotating platform. The limiting nut has a spherical clearance groove on the side facing the spherical washer, and the groove wall of the spherical clearance groove is adapted to the spherical side of the spherical washer.

[0010] In this embodiment of the utility model, the mounting assembly further includes a thrust washer and a mounting pin. The thrust washer is sleeved on the extension section, and the mounting pin passes through the thrust washer and is used to connect with the rotary platform. The spherical washer abuts against the thrust washer.

[0011] In this embodiment of the utility model, the connecting component further includes a first limiting block, a first fixing groove is provided on the clamping nut, a first limiting groove is provided on the first threaded section, and the first limiting block is disposed through the first fixing groove and extends into the first limiting groove; And / or, the mounting assembly also includes a second limiting block, a second fixing groove on the limiting nut, a second limiting groove on the second threaded section, and the second limiting block passing through the second fixing groove and extending into the second limiting groove.

[0012] In this embodiment of the utility model, the number of connection keys is set to multiple, and the multiple connection keys are arranged in a circumferential interval.

[0013] To achieve the above objectives, this utility model also provides a working machine, which includes a frame and a central pivot device according to the above description.

[0014] Through the above technical solutions, the central pivot device and working machinery provided by this utility model embodiment have the following beneficial effects: In the technical solution of this utility model, one end of the connecting shaft passes through the rotary platform and is connected to the rotary platform, while the other end of the connecting shaft passes through the base frame and extends out relative to the base frame. The connecting key extends laterally and passes through the base frame and the connecting shaft in sequence to limit the connecting shaft relative to the base frame and prevent the connecting shaft from rotating relative to the base frame. The connecting shaft and the base frame can be connected without interference fit, which greatly improves the ease of assembly. In addition, a clamping ring is sleeved on the connecting shaft, and the connecting key is located between the base frame and the clamping ring, so that the clamping ring can press the connecting key on the base frame, effectively preventing the axial movement of the connecting shaft, thereby stably fixing the connecting shaft on the base frame and improving the assembly stability of the connecting shaft and the base frame.

[0015] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of the assembly structure of the central pivot device according to an embodiment of the present invention from one perspective; Figure 2 This is a schematic diagram of the assembly structure of the central pivot device according to an embodiment of the present invention from another perspective; Figure 3 This is a cross-sectional structural schematic diagram of a central pivot device according to an embodiment of the present invention; Figure 4 yes Figure 3 Enlarged structural diagram of region A in the middle; Figure 5 yes Figure 3 A magnified structural diagram of region B in the middle; Figure 6 This is an exploded structural diagram of the central pivot device according to an embodiment of the present invention from one perspective; Figure 7 This is an exploded structural diagram of the central pivot device according to an embodiment of the present invention from another perspective.

[0017] Explanation of reference numerals in the attached figures Detailed Implementation

[0018] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0019] The central pivot device of this utility model is described below with reference to the accompanying drawings.

[0020] like Figure 1 , Figure 3 and Figure 4 As shown, this utility model provides a central pivot device, which includes a connecting shaft 10 and a connecting assembly 20. One end of the connecting shaft 10 is used to connect to the rotary platform 200 of the working machinery, and the other end of the connecting shaft 10 is used to pass through the base frame 300 of the working machinery. The connecting assembly 20 includes a connecting key 21 and a clamping ring 22. The connecting key 21 is used to pass laterally through the connecting shaft 10 and the base frame 300. The clamping ring 22 is sleeved on the connecting shaft 10, and the clamping ring 22 abuts against the side of the connecting key 21 facing away from the base frame 300.

[0021] It should be noted that the central pivot device of this utility model can be used in working machinery to connect the slewing platform 200 and the underframe 300. The working machinery can be an excavator, a crane or other working machinery with a slewing platform 200 and an underframe 300. This utility model does not limit the type of working machinery to which the central pivot device is applied. This utility model embodiment only uses the application of the central pivot device to a front shovel excavator as an example for illustration.

[0022] Specifically, the upper end of the connecting shaft 10 passes through and connects to the rotary platform 200, and the lower end of the connecting shaft 10 passes through the base frame 300 and extends out relative to the base frame 300. The connecting key 21 extends laterally and passes through the base frame 300 and the connecting shaft 10 in sequence to limit the connecting shaft 10 relative to the base frame 300 and prevent the connecting shaft 10 from rotating relative to the base frame 300. The connecting shaft 10 and the base frame 300 can be connected without interference fit, which greatly improves the ease of assembly. In addition, a clamping ring 22 is sleeved on the connecting shaft 10, and the connecting key 21 is located between the base frame 300 and the clamping ring 22, so that the clamping ring 22 can press the connecting key 21 on the base frame 300, effectively preventing the axial movement of the connecting shaft 10, and thus stably fixing the connecting shaft 10 on the base frame 300, improving the assembly stability of the connecting shaft 10 and the base frame 300.

[0023] In this embodiment of the utility model, the connecting shaft 10 includes an extension section 11 and a first threaded section 12. One end of the extension section 11 is used to connect with the rotary platform 200, and the other end of the extension section 11 is connected with the first threaded section 12. The extension section 11 is used for the base frame 300 to be fitted. The first threaded section 12 extends out relative to the base frame 300. The connecting key 21 is used to pass laterally through the extension section 11 and the base frame 300. The clamping ring 22 is a clamping nut 22a, which is fitted on the first threaded section 12 and threadedly connected to the first threaded section 12.

[0024] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the upper end of the extension section 11 is connected to the rotary platform 200, and the first threaded section 12 is connected to the lower end of the extension section 11 and has an external thread. The extension section 11 passes through the base frame 300 so that the first threaded section 12 extends out relative to the base frame 300. The connecting key 21 passes through the base frame 300 and the extension section 11 in sequence to limit the extension section 11 within the base frame 300, effectively preventing the connecting shaft 10 from rotating relative to the base frame 300. The clamping ring 22 is a clamping nut 22a with an internal thread. The clamping nut 22a is threadedly connected to the first threaded section 12 to press the connecting key 21 onto the base frame 300. In this way, the axial movement of the extension section 11 is restricted by the connecting key 21. The assembly is convenient, quick, stable and reliable. The threaded connection between the clamping nut 22a and the first threaded section 12 further reduces the assembly difficulty and has a high connection strength, effectively preventing the connecting shaft 10 from loosening.

[0025] In this embodiment of the utility model, a connecting hole 111 is provided on the extension section 11, and a connecting key 21 is provided to pass through the connecting groove 3011 on the base frame 300 and extend into the connecting hole 111. Figure 4 , Figure 6 and Figure 7 As shown, the extension section 11 has a horizontally extending connecting hole 111, and the base frame 300 has a connecting groove 3011 at the corresponding position of the connecting hole 111, so that the connecting key 21 can be installed in the connecting groove 3011 and extend through the connecting groove 3011 into the connecting hole 111, thereby limiting the extension section 11 to the base frame 300. The connecting groove 3011 and the connecting hole 111 cooperate to position and install the connecting key 21. Moreover, by limiting the extension section 11 by the connecting key 21, there is no need to perform interference fit of the connecting shaft 10, which reduces the requirements for the machining accuracy of the connecting shaft 10 and makes the assembly convenient and quick.

[0026] Furthermore, the base frame 300 is provided with a surrounding plate 301, which surrounds the outer periphery of the extension section 11. The surrounding plate 301 is provided with a connecting groove 3011 that communicates with the connecting hole 111. The connecting key 21 passes through the connecting groove 3011 and extends into the connecting hole 111.

[0027] like Figure 4 , Figure 6 and Figure 7 As shown, the extension section 11 has a horizontally extending connecting hole 111. The lower end of the base frame 300 is provided with a surrounding plate 301, which extends along the outer periphery of the extension section 11. A connecting groove 3011 is provided on the surrounding plate 301 at the position corresponding to the connecting hole 111, so that the connecting key 21 can be installed in the connecting groove 3011 and extend through the connecting groove 3011 into the connecting hole 111, thereby limiting the extension section 11 to the base frame 300. The connecting groove 3011 and the connecting hole 111 cooperate to position and install the connecting key 21. Furthermore, by limiting the extension section 11 with the connecting key 21, there is no need to perform interference fit on the connecting shaft 10, which reduces the requirements for the machining accuracy of the connecting shaft 10 and makes assembly convenient and quick.

[0028] In the embodiments of this utility model, such as Figure 4 , Figure 6 and Figure 7 As shown, the connecting assembly 20 also includes a connecting screw 23, which passes through the connecting key 21 and is used to thread it onto the base frame 300 to fix the connecting key 21 on the base frame 300. This effectively prevents the connecting key 21 from coming loose in the event of the pressure nut 22a coming loose, thus improving assembly stability and reliability.

[0029] Furthermore, a threaded hole 3012 is provided on the bottom wall of the connecting groove 3011. The connecting screw 23 passes through the connecting key 21 and is used for threaded connection into the threaded hole 3012 on the bottom wall of the connecting groove 3011. Figure 4 , Figure 6 and Figure 7 As shown, the bottom wall of the connecting groove 3011 is provided with a threaded hole 3012 for the connecting screw 23 to be inserted. The connecting screw 23 passes through the connecting key 21 and is threadedly connected to the wall of the threaded hole 3012. The connection is convenient, quick and strong, and the connection key 21 is positioned and installed, effectively preventing the connecting key 21 from loosening.

[0030] In this embodiment of the utility model, the connecting shaft 10 further includes a second threaded section 13, which is connected to the end of the extension section 11 away from the first threaded section 12. The extension section 11 is used for the rotary platform 200 to be fitted. The second threaded section 13 extends out relative to the rotary platform 200. The central pivot device also includes a mounting component 30, which includes a limiting nut 31. The limiting nut 31 is fitted onto the second threaded section 13 and threadedly connected to the second threaded section 13.

[0031] like Figure 3 , Figures 5 to 7As shown, the second threaded section 13 is connected to the upper end of the extension section 11 and has an external thread. The extension section 11 passes through the rotary platform 200 so that the second threaded section 13 extends relative to the rotary platform 200. The limiting nut 31 is threadedly connected to the second threaded section 13 to fix the extension section 11 relative to the rotary platform 200. This realizes the connection between the rotary platform 200 and the base frame 300 through the connecting shaft 10. The connection between the limiting nut 31 and the second threaded section 13 restricts the axial movement of the extension section 11, improving the assembly stability of the connecting shaft 10. The threaded connection between the limiting nut 31 and the second threaded section 13 makes assembly convenient and quick, simplifies the assembly steps, increases the connection strength, and improves the connection reliability.

[0032] In this embodiment of the utility model, the mounting component 30 further includes a spherical washer 32, which is sleeved on the second threaded section 13 and located between the limiting nut 31 and the rotating platform 200. The limiting nut 31 has a spherical clearance groove 311 on the side facing the spherical washer 32, and the groove wall of the spherical clearance groove 311 is adapted to the spherical side of the spherical washer 32.

[0033] like Figures 5 to 7 As shown, a spherical washer 32 is sandwiched between the limiting nut 31 and the rotating platform 200. The spherical washer 32 has a planar side and a spherical side arranged opposite to each other. The planar side of the spherical washer 32 abuts against the rotating platform 200, and the spherical side of the spherical washer 32 faces the limiting nut 31. A spherical clearance groove 311 is provided on the lower side of the limiting nut 31 to avoid the spherical washer 32, so that the spherical side of the spherical washer 32 can fit against the groove wall of the spherical clearance groove 311, thereby making the spherical side... The spherical side of the washer 32 serves to adjust the installation angle deviation to ensure that the limit nut 31 is perpendicularly connected to the second threaded section 13, and to distribute the pressure of the limit nut 31 on the second threaded section 13, thereby protecting the second threaded section 13 and extending the service life of the connecting shaft 10. Furthermore, by setting the spherical washer 32 between the limit nut 31 and the rotary platform 200, the friction force of the limit nut 31 during assembly is increased, thereby preventing the limit nut 31 from loosening and further improving the assembly stability.

[0034] In this embodiment of the utility model, the mounting assembly 30 further includes a thrust washer 33 and a mounting pin 34. The thrust washer 33 is sleeved on the extension section 11, and the mounting pin 34 passes through the thrust washer 33 and is used to connect with the rotary platform 200. The spherical washer 32 abuts against the thrust washer 33.

[0035] like Figures 5 to 7As shown, the thrust washer 33 is sandwiched between the rotary platform 200 and the spherical washer 32 to bear axial load, reduce friction and wear, and extend service life. In addition, the mounting pin 34 can pass through the thrust washer 33 and connect to the rotary platform 200, thereby fixing the thrust washer 33 on the rotary platform 200, which plays the role of positioning and installing the thrust washer 33, and effectively prevents the thrust washer 33 from rotating relative to the extension section 11, further improving assembly stability.

[0036] Furthermore, the rotary platform 200 has a mounting groove 201 at one end facing the spherical washer 32, and a mounting hole 202 is provided on the bottom wall of the mounting groove 201. The thrust washer 33 is located in the mounting groove 201, and the mounting pin 34 passes through the thrust washer 33 and extends into the mounting hole 202. The spherical washer 32 extends into the mounting groove 201 and abuts against the thrust washer 33.

[0037] like Figures 5 to 7 As shown, the upper end of the rotary platform 200 is provided with a mounting groove 201. The mounting groove 201 is used for mounting the thrust washer 33 and for the spherical washer 32 to extend into, thereby positioning and installing the thrust washer 33 and the spherical washer 32. The thrust washer 33 is sandwiched between the bottom wall of the mounting groove 201 and the spherical washer 32 to bear axial load, reduce friction and wear, and extend service life. In addition, the bottom wall of the mounting groove 201 is provided with a mounting hole 202 for the mounting pin 34 to extend into, so that the mounting pin 34 can pass through the thrust washer 33 and extend into the mounting hole 202, thereby fixing the thrust washer 33 in the mounting groove 201, which serves to position and install the thrust washer 33 and effectively prevents the thrust washer 33 from rotating relative to the extension section 11, further improving assembly stability.

[0038] In this embodiment of the utility model, the connecting component 20 further includes a first limiting block 24, a first fixing groove 221 is provided on the clamping nut 22a, a first limiting groove 121 is provided on the first threaded section 12, and the first limiting block 24 passes through the first fixing groove 221 and extends into the first limiting groove 121.

[0039] like Figure 1 , Figure 6 and Figure 7As shown, when the clamping nut 22a is connected to the first threaded section 12, the first fixing groove 221 communicates with the first limiting groove 121. The first limiting block 24 is installed in the first fixing groove 221 and extends into the first limiting groove 121, thereby fixing the first threaded section 12 relative to the clamping nut 22a. This prevents the clamping nut 22a from rotating relative to the first threaded section 12, effectively preventing the clamping nut 22a from loosening and improving the connection stability and reliability. Furthermore, the number of the first fixing groove 221 and the first limiting groove 121 can be set to multiple. Multiple first fixing grooves 221 are arranged circumferentially on the clamping nut 22a, and multiple first limiting grooves 121 are arranged circumferentially on the outer periphery of the first threaded section 12, so that the first limiting block 24 can pass through the interconnected first fixing groove 221 and the first limiting groove 121, improving the ease of installation.

[0040] In this embodiment of the utility model, the installation component 30 further includes a second limiting block 35, a second fixing groove 312 is provided on the limiting nut 31, a second limiting groove 131 is provided on the second threaded section 13, and the second limiting block 35 is set through the second fixing groove 312 and extends into the second limiting groove 131.

[0041] like Figure 2 , Figure 6 and Figure 7 As shown, when the limiting nut 31 is connected to the second threaded section 13, the second fixing groove 312 communicates with the second limiting groove 131. The second limiting block 35 is installed in the second fixing groove 312 and extends into the second limiting groove 131, thereby fixing the second threaded section 13 relative to the limiting nut 31. This prevents the limiting nut 31 from rotating relative to the second threaded section 13, effectively preventing the limiting nut 31 from loosening and improving the connection stability and reliability. Furthermore, the number of the second fixing groove 312 and the second limiting groove 131 can be multiple. Multiple second fixing grooves 312 are arranged circumferentially on the limiting nut 31, and multiple second limiting grooves 131 are arranged circumferentially on the outer periphery of the second threaded section 13, so that the second limiting block 35 can pass through the interconnected second fixing groove 312 and the second limiting groove 131, improving the ease of installation.

[0042] In the embodiments of this utility model, such as Figure 3 , Figure 6 and Figure 7 As shown, a sleeve 112 is fitted on the extension section 11, and the sleeve 112 is located between the rotary platform 200 and the extension section 11. The sleeve 112 reduces friction, effectively prevents the rotary platform 200 from directly contacting the extension section 11, greatly slows down the wear rate of the extension section 11, and extends the service life of the connecting shaft 10.

[0043] In the embodiments of this utility model, such as Figure 3 , Figure 6 and Figure 7 As shown, the number of connecting keys 21 is set to multiple, and the multiple connecting keys 21 are arranged circumferentially at intervals. Each connecting key 21 is arranged laterally through the base frame 300 and the connecting shaft 10 to limit the connecting shaft 10 relative to the base frame 300. The multiple connecting keys 21 all serve to limit the connecting shaft 10 and connect the base frame 300 and the connecting shaft 10, which greatly improves the connection stability between the base frame 300 and the connecting shaft 10, effectively prevents the connecting shaft 10 from loosening, and ensures stable and reliable assembly.

[0044] In addition, this utility model also provides a working machine, which includes a frame, and the frame includes a central pivot device as described above. Specifically, the frame also includes a slewing platform 200 and a base frame 300. The central pivot device is used to connect the slewing platform 200 and the base frame 300. The specific structure of the central pivot device is as described in the above embodiments. Since the working machine adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0045] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0048] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A central pivot device, characterized in that, The central pivot device includes: A connecting shaft (10) is provided, one end of which is used to connect to the rotary platform (200) of the working machinery, and the other end of which is used to pass through the base frame (300) of the working machinery. The connecting assembly (20) includes a connecting key (21) and a clamping ring (22). The connecting key (21) is configured to pass laterally through the connecting shaft (10) and the base frame (300). The clamping ring (22) is sleeved on the connecting shaft (10) and abuts against the side of the connecting key (21) facing away from the base frame (300).

2. The central pivot device according to claim 1, characterized in that, The connecting shaft (10) includes an extension section (11) and a first threaded section (12). One end of the extension section (11) is used to connect with the rotary platform (200), and the other end of the extension section (11) is connected with the first threaded section (12). The extension section (11) is used for the base frame (300) to be fitted. The first threaded section (12) extends out relative to the base frame (300). The connecting key (21) is used to pass laterally through the extension section (11) and the base frame (300). The clamping ring (22) is a clamping nut (22a). The clamping nut (22a) is fitted on the first threaded section (12) and threadedly connected to the first threaded section (12).

3. The central pivot device according to claim 2, characterized in that, The extension section (11) is provided with a connection hole (111), and the connection key (21) is used to pass through the connection groove (3011) on the base frame (300) and extend into the connection hole (111).

4. The central pivot device according to claim 3, characterized in that, The connecting assembly (20) further includes a connecting screw (23) which passes through the connecting key (21) and is used for threaded connection in a threaded hole (3012) on the bottom wall of the connecting groove (3011).

5. The central pivot device according to claim 2, characterized in that, The connecting shaft (10) further includes a second threaded section (13), which is connected to the end of the extension section (11) away from the first threaded section (12). The extension section (11) is used for the rotary platform (200) to be fitted. The second threaded section (13) extends out relative to the rotary platform (200). The central pivot device further includes a mounting assembly (30), which includes a limiting nut (31) that is fitted onto the second threaded section (13) and threadedly connected to the second threaded section (13).

6. The central pivot device according to claim 5, characterized in that, The mounting assembly (30) also includes a spherical washer (32), which is fitted onto the second threaded section (13) and located between the limiting nut (31) and the rotary platform (200). The limiting nut (31) has a spherical clearance groove (311) on the side facing the spherical washer (32), and the groove wall of the spherical clearance groove (311) is adapted to the spherical side of the spherical washer (32).

7. The central pivot device according to claim 6, characterized in that, The mounting assembly (30) further includes a thrust washer (33) and a mounting pin (34). The thrust washer (33) is fitted onto the extension section (11). The mounting pin (34) passes through the thrust washer (33) and is used to connect with the rotary platform (200). The spherical washer (32) abuts against the thrust washer (33).

8. The central pivot device according to claim 5, characterized in that, The connecting assembly (20) further includes a first limiting block (24), a first fixing groove (221) is provided on the clamping nut (22a), a first limiting groove (121) is provided on the first threaded section (12), and the first limiting block (24) passes through the first fixing groove (221) and extends into the first limiting groove (121); And / or, the mounting assembly (30) further includes a second limiting block (35), a second fixing groove (312) is provided on the limiting nut (31), a second limiting groove (131) is provided on the second threaded section (13), and the second limiting block (35) passes through the second fixing groove (312) and extends into the second limiting groove (131).

9. The central pivot device according to any one of claims 1 to 8, characterized in that, The number of the connection keys (21) is set to multiple, and the multiple connection keys (21) are arranged circumferentially.

10. A type of operating machinery, characterized in that, The working machinery includes a frame, and the frame includes a central pivot device according to any one of claims 1 to 9.

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