Pin shaft connecting structure and mixing tower

Abstract

The application provides a pin shaft connecting structure and a mixing tower, and the pin shaft connecting structure is used for connecting an ear plate of the mixing tower; the pin shaft connecting structure comprises a pin shaft and a plurality of buffer pieces; the pin shaft is used for penetrating through an assembly hole of the ear plate, a side wall of the pin shaft is provided with a plurality of annular grooves, the plurality of annular grooves are arranged at intervals along an axial direction of the pin shaft, a through hole penetrating through the pin shaft is arranged on the pin shaft, and an extension direction of the through hole is perpendicular to the axial direction of the pin shaft; the buffer piece is in a ring structure, the plurality of buffer pieces are respectively sleeved on the pin shaft, and the plurality of buffer pieces correspondingly extend into the plurality of annular grooves; wherein, a bottom wall of at least part of the annular grooves is provided with an annular protrusion, an inner periphery of at least part of the buffer pieces is provided with an annular groove, and the annular protrusion extends into the annular groove. The pin shaft connecting structure provided by the application can reduce vibration of the mixing tower directly transmitted to the pin shaft, and improve the connection reliability and the service life of the pin shaft.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and in particular to a pin shaft connection structure and a hybrid tower. Background Technology

[0002] A hybrid tower is a tower structure that combines concrete and steel, used as a key support component for wind turbine generators. The pins play a crucial role in transmitting loads and ensuring structural stability during the assembly of various hybrid tower sections, the connection between the tower and the foundation, and the nacelle.

[0003] Currently, the two components of the mixing tower are each equipped with lugs, and pins pass through the mounting holes of the two lugs. The pins are fixed to the lugs by interference fit or friction between the mating surfaces, and are press-fitted using pressure equipment during installation. However, the vibration of the mixing tower is directly transmitted to the pins, which not only accelerates pin fatigue damage, reduces connection reliability and pin lifespan, but also increases the overall noise and vibration levels of the unit, affecting the unit's operational stability and environmental adaptability. Utility Model Content

[0004] This application provides a pin connection structure and a mixing tower, which can reduce the vibration directly transmitted from the mixing tower to the pin, and improve the connection reliability and the service life of the pin.

[0005] In a first aspect, embodiments of this application provide a pin connection structure for connecting the lugs of a mixing tower; including a pin and multiple buffer components;

[0006] The pin is used to pass through the mounting hole of the ear plate. The side wall of the pin has multiple annular grooves, which are spaced apart along the axial direction of the pin. The pin has a through hole that passes through the pin, and the extension direction of the through hole is perpendicular to the axial direction of the pin.

[0007] The buffer is a ring structure, with multiple buffers respectively sleeved on the pin shaft, and each buffer extending into a ring groove in a corresponding manner.

[0008] In this design, at least a portion of the bottom wall of the annular groove has an annular protrusion, and at least a portion of the buffer member has an annular groove on its inner circumference, with the annular protrusion extending into the annular groove.

[0009] In one embodiment, buffers are provided between both ends of the assembly hole and the pin.

[0010] In one embodiment, the buffer is a rubber ring.

[0011] In one embodiment, the pin includes a first connecting segment and a second connecting segment connected in sequence. The diameter of the first connecting segment is smaller than the diameter of the second connecting segment. Annular grooves are respectively provided on the first connecting segment and the second connecting segment. Buffer members are respectively fitted on the first connecting segment and the second connecting segment, and each buffer member extends into the corresponding annular groove.

[0012] In one embodiment, a through hole is provided on the pin, and the extension direction of the through hole is perpendicular to the axial direction of the pin.

[0013] In one embodiment, the pin includes a main body and a limiting part disposed at one end of the main body. The diameter of the limiting part is larger than the diameter of the main body. An annular groove is formed on the main body. A mounting part is disposed at the end of the main body away from the limiting part.

[0014] The pin connection structure also includes a limiting member, which is installed on the mounting part, and the ear plate is located between the limiting part and the limiting member.

[0015] In one embodiment, the mounting part is a threaded segment disposed on the pin, and the limiting member is sleeved on the threaded segment and threadedly connected to the threaded segment.

[0016] In one embodiment, the pin connection structure further includes a bushing that passes through the assembly hole, through which the pin passes, and where the outer wall of the buffer abuts against the inner wall of the bushing.

[0017] In one embodiment, the surface of the pin is provided with a protective layer.

[0018] In one embodiment, the pin has a tensile strength greater than 1000 MPa.

[0019] Secondly, embodiments of this application also provide a mixing tower, including the aforementioned pin connection structure.

[0020] The pin connection structure and mixing tower provided in this application embodiment are used to connect the ear plates of the mixing tower. The pin connection structure includes a pin and multiple buffer members. The pin passes through the assembly hole of the ear plate, and the multiple buffer members are respectively sleeved on the pin, with each buffer member extending into an annular groove on the pin. The annular groove can limit the movement of the buffer members relative to the pin along the axial direction of the pin, ensuring reliable contact between the buffer members and the wall of the assembly hole. The through hole on the pin can change the stress distribution path inside the pin, dispersing concentrated stress to the periphery of the through hole, thereby reducing the stress peak value of the key section of the pin and avoiding the risk of fatigue damage or fracture of the pin due to excessive stress. The annular protrusion on the bottom wall of the annular groove on the pin extends into the annular groove on the inner circumference of the buffer member, and the cooperation between the annular protrusion and the annular groove improves the reliability of the connection between the buffer member and the pin. In this way, when the pin connection structure connects the two lugs, the buffer can reduce the vibration directly transmitted from the mixing tower to the pin, improve the connection reliability and the service life of the pin, and at the same time reduce the overall noise and vibration level, ensuring the stability of unit operation and environmental adaptability. Attached Figure Description

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

[0022] Figure 1 This is a schematic diagram of the connection between the pin and the lug provided in an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the structure of a pin provided in an embodiment of this application;

[0024] Figure 3 This is a schematic diagram of another pin structure provided in an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the connection between the pin and the bushing provided in an embodiment of this application.

[0026] Figure label:

[0027] 100. Pin; 110. Annular groove; 111. Annular protrusion; 120. Main body; 121. First connecting section; 122. Second connecting section; 123. Third connecting section; 124. Threaded section; 130. Limiting part; 140. Through hole;

[0028] 200. Buffer element; 210. Annular groove;

[0029] 300. Bushing;

[0030] 400. Earplate. Detailed Implementation

[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0032] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0035] Currently, the two components of the hybrid power tower are each equipped with lugs, and the pins pass through the mounting holes of the two lugs. The pins are fixed to the lugs by interference fit or friction between the mating surfaces, and are press-fitted using pressure equipment during installation. However, the vibrations generated by wind and unit operation are directly transmitted to the pins through the tower frame, causing the pins and surrounding structures to endure high-frequency, high-amplitude vibrations for extended periods. This not only accelerates pin fatigue damage, reduces connection reliability and service life, but also increases the overall noise and vibration levels of the unit, affecting its operational stability and environmental adaptability.

[0036] To address the aforementioned problems, this application provides a pin-shaft connection structure and a mixing tower, which is used to connect the ear plates of the mixing tower. The pin-shaft connection structure includes a pin and multiple buffer members. The pin passes through an assembly hole in the ear plate, and the multiple buffer members are respectively sleeved on the pin, extending one-to-one into annular grooves on the pin. The annular grooves limit the movement of the buffer members relative to the pin along the pin's axial direction, ensuring reliable contact between the buffer members and the wall of the assembly hole. Through holes on the pin alter the stress distribution path within the pin, dispersing concentrated stress around the through holes, thereby reducing the stress peak at critical sections of the pin and preventing fatigue damage or breakage due to excessive stress. An annular protrusion on the bottom wall of the annular groove on the pin extends into an annular groove on the inner circumference of the buffer member, improving the reliability of the connection between the buffer member and the pin through the fit between the annular protrusion and the annular groove. In this way, when the pin connection structure connects the two lugs, the buffer can reduce the vibration directly transmitted from the mixing tower to the pin, improving connection reliability and pin lifespan, while also reducing overall unit noise and vibration levels, ensuring unit operational stability and environmental adaptability. Furthermore, using multiple buffers can further reduce the vibration directly transmitted from the mixing tower to the pin, further improving connection reliability and pin lifespan.

[0037] The pin connection structure and the specific structure of the mixing tower provided in the embodiments of this application will be described below with reference to the accompanying drawings.

[0038] Reference Figure 1 and Figure 2 As shown in the figure, this application embodiment provides a pin connection structure for connecting the lugs of a mixing tower. The pin connection structure includes a pin 100 and a plurality of buffer members 200.

[0039] The pin 100 is used to pass through the mounting hole of the ear plate 400. The side wall of the pin 100 is provided with a plurality of annular grooves 110, which are arranged at intervals along the axial direction of the pin 100. The pin 100 is provided with a through hole 140, which extends through the pin 100 and the extension direction of the through hole 140 is perpendicular to the axial direction of the pin 100.

[0040] As an illustration, the ear plate 400 and components of the mixing tower, such as the mixing tower wall, can be fixed by full penetration welding. After welding, flaw detection is performed to ensure the connection strength. The thickness of the ear plate 400 and the diameter of the mounting holes can be designed according to the unit load requirements and are not limited here.

[0041] The pin 100 can be a columnar structure, which passes through the mounting holes of the two ear plates 400 to fix the two ear plates 400. For example... Figure 1 As shown, the lugs 400 of the two components of the mixing tower can be connected by multiple pins 100, which are arranged at intervals. The diameter of each pin 100 matches the diameter of the mounting hole. Schematally, an annular groove 110 is arranged around the axis of the pin 100.

[0042] The specific number of annular grooves 110 on pin 100 can be set according to actual needs and is not limited here. Through holes 140 on pin 100 can act as stress holes. When the tower of the hybrid tower undergoes torsional deformation during operation, pin 100 will be subjected to combined forces such as shear and bending. Through holes 140 on pin 100 can change the stress distribution path inside pin 100, dispersing concentrated stress to the periphery of the through holes 140, thereby reducing the stress peak at critical sections of pin 100 and avoiding fatigue damage or fracture risk due to excessive stress. Optionally, a structural diagram of pin 100 can be drawn using simulation software. The stress distribution of pin 100 can be determined through simulation software, and the specific location and number of through holes 140 can be determined based on the stress distribution.

[0043] The buffer element 200 has a ring-shaped structure, and multiple buffer elements 200 are respectively sleeved on the pin 100. The multiple buffer elements 200 extend into multiple annular grooves 110 in a one-to-one correspondence. The number of buffer elements 200 is the same as the number of annular grooves 110. After the multiple buffer elements 200 are installed on the pin 100, they are arranged at intervals along the axial direction of the pin 100.

[0044] Along the axial direction of the pin 100, the dimensions of the buffer member 200 match the dimensions of the annular groove 110. After the buffer member 200 extends into the annular groove 110, the annular groove 110 can limit the buffer member 200, preventing it from moving along the axial direction of the pin 100. Illustratively, the buffer member 200 can undergo elastic deformation when subjected to external force. This elastic deformation absorbs and attenuates vibration energy, preventing the load from being directly and rigidly transmitted to the pin 100, thus improving the connection reliability between the two ear plates 400 and the service life of the pin 100. In one possible implementation, the buffer member 200 includes two arc-shaped connecting parts that interlock to form a ring structure. During assembly, the two connecting parts of the buffer member 200 can be respectively inserted into the same annular groove 110 and interlocked to fix the buffer member 200.

[0045] Among them, at least a portion of the bottom wall of the annular groove 110 is provided with an annular protrusion 111, and at least a portion of the buffer member 200 is provided with an annular groove 210 on its inner periphery, with the annular protrusion 111 extending into the annular groove 210.

[0046] Specifically, the annular protrusion 111 is arranged around the axis of the pin 100, and is located in the middle of the annular groove 110 along the axial direction of the pin 100. Optionally, the cross-sectional shape of the annular protrusion 111 can be rectangular. For example, the annular groove 210 can be formed in one piece on the inner circumference of the buffer member 200. When the annular protrusion 111 extends into the annular groove 210, the engagement between the annular protrusion 111 and the annular groove 210 can further limit the buffer member 200, further preventing the buffer member 200 from moving along the axial direction of the pin 100.

[0047] In one possible implementation, such as Figures 2-4 As shown, along the axial direction of the pin 100, the annular protrusion 111 has an annular limiting groove in the middle, and the annular groove 210 has an annular limiting protrusion in the middle of the groove bottom. The annular limiting protrusion extends into the annular limiting groove. Through the cooperation between the annular limiting groove and the annular limiting protrusion, the buffer 200 on the pin 100 is further limited.

[0048] In one embodiment, buffer elements 200 are provided at both ends of the mounting hole and between the mounting pin and the pin. The deformation of the buffer elements 200 can also serve as a seal, preventing external moisture or salt from entering between the pin 100 and the mounting hole, thus extending the service life of the pin 100 and the ear plate 400.

[0049] In one embodiment, the buffer 200 is a rubber ring.

[0050] Schematic illustration: The material of the buffer component 200 can be weather-resistant nitrile butadiene rubber (NBR). NBR possesses excellent elasticity, oil resistance, and abrasion resistance, making it suitable for contact with metal components. NBR also exhibits good weather resistance, ozone resistance, and high and low temperature resistance (it can operate stably within a range of -40℃ to 150℃), adapting to different regional climates and preventing the buffer component 200 from failing due to aging, thus maintaining its cushioning effect. During assembly, the buffer component 200 can be fitted onto the pin 100 and extend into the annular groove 110 through the elastic deformation of the rubber.

[0051] With the above configuration, the buffer 200 has good elastic deformation capability. When the tower is slightly displaced or twisted due to wind load or unit operation vibration, the buffer 200 can absorb some energy through its own compression and rebound, playing a role in buffering and shock absorption, while reducing rigid collisions and wear between metal components.

[0052] In one embodiment, such as Figure 3 As shown, the pin 100 includes a first connecting segment 121 and a second connecting segment 122 connected in sequence. The diameter of the first connecting segment 121 is smaller than the diameter of the second connecting segment 122. Annular grooves 110 are respectively formed on the first connecting segment 121 and the second connecting segment 122. Buffer members 200 are respectively fitted onto the first connecting segment 121 and the second connecting segment 122, with each buffer member 200 extending into its corresponding annular groove 110.

[0053] Schematic illustration: the first connecting segment 121 and the second connecting segment 122 are coaxially arranged. The length and diameter of each of the first connecting segment 121 and the second connecting segment 122 can be set according to actual needs and are not limited here. Optionally, the pin 100 can be integrally formed to form the first connecting segment 121 and the second connecting segment 122, which are shaft segments of the pin 100 with different diameters. It is understood that a shoulder is defined between the first connecting segment 121 and the second connecting segment 122. Figure 3 As shown, the pin 100 may further include a third connecting segment 123, the diameter of which is larger than the diameter of the second connecting segment 122, and the end of the third connecting segment 123 is connected to the end of the second connecting segment 122 away from the first connecting segment 121. A shoulder is also defined between the second connecting segment 122 and the third connecting segment 123.

[0054] When using the pin 100 to connect the two ear plates 400, the first connecting section 121 of the pin 100 passes through the mounting holes of the two ear plates 400, or the second connecting section 122 of the pin 100 passes through the mounting holes of the two ear plates 400.

[0055] With the above-described design, the pin 100 adopts a stepped design, and its first connecting section 121 and second connecting section 122 can be matched with mounting holes of different diameters on the ear plate 400. The pin 100 can achieve precise positioning in the mounting holes, preventing installation misalignment. When the first connecting section 121 passes through the mounting hole, the shoulder between the first connecting section 121 and the second connecting section 122 can fit against the side of the ear plate 400, evenly transferring vertical and lateral loads to the ear plate 400, avoiding localized stress concentration, and improving the reliability of the connection.

[0056] In one embodiment, such as Figure 3 and Figure 4 As shown, the pin 100 includes a main body 120 and a limiting part 130 disposed at one end of the main body 120. The diameter of the limiting part 130 is larger than the diameter of the main body 120. An annular groove 110 is formed on the main body 120. A mounting part is provided at the end of the main body 120 away from the limiting part 130.

[0057] Indicatively, both the limiting part 130 and the main body 120 are columnar structures. The diameter of the limiting part 130 is larger than the diameter of the main body 120. When the pin 100 is in use, its main body 120 passes through the mounting hole of the ear plate, and the mounting part on the main body 120 extends out of the mounting hole. The limiting part 130 can abut against the side of the ear plate.

[0058] The pin connection structure also includes a limiting member, which is installed on the mounting part, and the ear plate is located between the limiting part 130 and the limiting member.

[0059] Specifically, after the main body 120 of the pin 100 passes through the mounting hole of the ear plate, the limiting member is installed on the mounting part of the pin 100. The limiting member abuts against the side of the ear plate. At this time, the limiting part 130 of the pin 100 and the limiting member are located on opposite sides of the ear plate. The limiting part 130 and the limiting member limit the pin 100, preventing it from falling off the ear plate and ensuring connection stability.

[0060] In one possible implementation, such as Figure 3 As shown, when the main body 120 of the pin 100 includes a first connecting section 121, a second connecting section 122 and a third connecting section 123, mounting portions can be provided at the ends of the first connecting section 121 away from the limiting portion 130, the ends of the second connecting section 122 away from the limiting portion 130 and the ends of the third connecting section 123 away from the limiting portion 130, respectively.

[0061] In one specific embodiment, the mounting part is a threaded section 124 disposed on the pin 100, and the limiting member is sleeved on the threaded section 124 and threadedly connected to the threaded section 124.

[0062] A nut can be used as a limiting element. After being fitted onto the threaded section 124, the position of the limiting element on the pin 100 can be adjusted by rotating the limiting element. In this way, by adjusting the position of the limiting element on the pin, the limiting element and the limiting part 130 of the pin 100 can reliably abut against the ear plate.

[0063] In other embodiments, the mounting portion can be a connecting hole formed on the pin 100, and the limiting member can be a limiting shaft. After the pin 100 passes through the mounting hole of the ear plate, the limiting shaft passes through the connecting hole of the pin 100, at which time the portion of the limiting shaft located outside the pin 100 abuts against the side of the ear plate.

[0064] In one embodiment, such as Figure 4 As shown, the pin connection structure also includes a bushing 300, which is inserted into the assembly hole. The pin 100 passes through the bushing 300, and the outer wall of the buffer 200 abuts against the inner wall of the bushing 300.

[0065] For example, the bushing 300 has a cylindrical structure, the outer wall of which abuts against the side wall of the mounting hole. When connecting the two ear plates 400 using the pin 100, pretreatment is performed first: the mounting holes of the ear plates 400 are cleaned and chamfered, the bushing 300 is installed, and the fit between the bushing 300 and the mounting hole is checked. After cleaning the surface of the pin 100, a small amount of grease is applied (to aid in insertion). Using a special lifting fixture, the pin 100 is slowly inserted into the bushing 300 to secure the two ear plates 400 together.

[0066] By setting a bushing 300 between the pin 100 and the assembly hole, the bushing 300 can play a wear-resistant role, reduce the wear between the pin 100 and the wall of the assembly hole, and improve the reliability of the connection.

[0067] In one embodiment, the surface of the pin 100 is provided with a protective layer.

[0068] Indicatively, a protective layer is formed on the surface of the pin 100 through surface treatment. Specifically, the pin 100 can be hot-dip galvanized or nitrided. Hot-dip galvanizing forms a uniform and dense zinc layer on the surface of the pin 100, which acts as a protective layer, isolating it from air and moisture and effectively preventing atmospheric corrosion. Nitriding, on the other hand, forms a high-hardness nitrided layer on the surface of the pin 100. This nitrided layer, as a protective layer, not only improves the surface wear resistance of the pin 100 but also enhances its fatigue resistance and corrosion resistance.

[0069] By providing a protective layer on the surface of the pin 100, the service life of the pin 100 is improved.

[0070] In one embodiment, the tensile strength of the pin 100 is greater than 1000 MPa.

[0071] As an illustration, the material of pin 100 can be high-strength alloy structural steel, such as 42CrMo, and pin 100 can undergo quenching and tempering treatment (quenching + high-temperature tempering). This configuration ensures that the tensile strength of pin 100 exceeds 1000 MPa, and that pin 100 has sufficient load-bearing capacity to withstand combined forces. Through this configuration, pin 100 possesses high impact toughness, enabling it to withstand instantaneous impact loads, while its good fatigue strength guarantees its service life under long-term alternating loads.

[0072] This application also provides a mixing tower, including the above-described pin connection structure.

[0073] The mixing tower provided in this embodiment adopts the above-mentioned pin connection structure, which makes the connection between the two components of the mixing tower more reliable, which helps to improve the service life of the mixing tower, while reducing the overall noise and vibration level, and ensuring the stability of unit operation and environmental adaptability.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A pin-shaft connection structure for connecting the lugs of a mixing tower; characterized in that, Includes pins and multiple buffer components; The pin is used to pass through the mounting hole of the ear plate. The side wall of the pin has a plurality of annular grooves, which are spaced apart along the axial direction of the pin. The pin has a through hole that passes through the pin, and the extension direction of the through hole is perpendicular to the axial direction of the pin. The buffer is a ring structure, and multiple buffers are respectively sleeved on the pin shaft, with each buffer extending into a corresponding annular groove. Wherein, at least a portion of the bottom wall of the annular groove is provided with an annular protrusion, and at least a portion of the inner circumference of the buffer member is provided with an annular groove, the annular protrusion extending into the annular groove.

2. The pin connection structure according to claim 1, characterized in that, The buffer is provided between both ends of the assembly hole and the pin.

3. The pin connection structure according to claim 1, characterized in that, The buffer element is a rubber ring.

4. The pin connection structure according to claim 1, characterized in that, The pin includes a first connecting segment and a second connecting segment connected in sequence. The diameter of the first connecting segment is smaller than the diameter of the second connecting segment. Annular grooves are respectively formed on the first connecting segment and the second connecting segment. The buffer members are respectively fitted on the first connecting segment and the second connecting segment, and each buffer member extends into the corresponding annular groove.

5. The pin connection structure according to claim 1, characterized in that, The pin includes a main body and a limiting part disposed at one end of the main body. The diameter of the limiting part is larger than the diameter of the main body. The annular groove is formed on the main body. A mounting part is disposed at the end of the main body away from the limiting part. The pin connection structure also includes a limiting member, which is installed on the mounting part, and the ear plate is located between the limiting part and the limiting member.

6. The pin connection structure according to claim 5, characterized in that, The mounting part is a threaded section provided on the pin shaft, and the limiting member is sleeved on the threaded section and threadedly connected to the threaded section.

7. The pin connection structure according to any one of claims 1-6, characterized in that, The pin connection structure also includes a bushing, which passes through the assembly hole, and the pin passes through the bushing. The outer wall of the buffer abuts against the inner wall of the bushing.

8. The pin connection structure according to any one of claims 1-6, characterized in that, The surface of the pin is provided with a protective layer.

9. The pin connection structure according to any one of claims 1-6, characterized in that, The tensile strength of the pin is greater than 1000 MPa.

10. A mixing tower, characterized in that, The pin connection structure includes any one of claims 1-9.

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