A follower, a transmission assembly, and a photovoltaic tracking device

Abstract

This utility model first proposes a driven component, including a lead screw nut and a mounting portion, wherein the lead screw nut is fixedly connected to the mounting portion, and the mounting portion has a groove A on its circumferential surface for connection with external components. Secondly, this utility model proposes a transmission assembly including the aforementioned driven component. This utility model also proposes a photovoltaic tracking device including the aforementioned transmission assembly. The advantages of this application are: simple installation, easy disassembly, and suitability for space-constrained or highly integrated environments; furthermore, it is more practical and applicable to various application scenarios.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic tracking, and in particular to a follower, a transmission assembly, and a photovoltaic tracking device. Background Technology

[0002] In a lead screw drive system, the relative motion between the lead screw and the lead screw nut constitutes the basic mode of power transmission. Typically, a flange is installed on the lead screw nut, connecting it to external components to efficiently transmit power to the desired location.

[0003] However, in applications requiring high integration, such as transmission systems within cylindrical structures using lead screw drives, the radial dimension of the flange is larger than the radial dimension of the main body of the lead screw nut that only mates with the lead screw. This increases the overall size of the transmission system. Consequently, the application of the driven component is limited in space-constrained environments or environments requiring high integration. Utility Model Content

[0004] The primary objective of this invention is to provide a driven component to address the problems caused by the driven component in space-constrained or highly integrated environments where screw drives are used. Secondly, this invention also provides a transmission assembly. Thirdly, this invention further provides a photovoltaic tracking device.

[0005] To achieve the above objectives, the main contents of this utility model are as follows:

[0006] A follower, comprising,

[0007] Screw nut

[0008] It also includes a cylindrical mounting part, which is connected to the lead screw nut, and the mounting part has at least one slot A for connecting external components on its circumferential surface.

[0009] Preferably, the mounting part includes a connecting part A, the cross-section of the connecting part A is non-circular, the lead screw nut is provided with a connecting part B that cooperates with the connecting part A, and the lead screw nut is fixedly connected to the connecting part A of the mounting part through the connecting part B;

[0010] or,

[0011] The mounting part includes a bending part, and the outer peripheral surface of the lead screw nut is provided with a groove B that mates with the bending part. The lead screw nut is embedded in the mounting part, and the bending part is embedded in the groove B.

[0012] or,

[0013] The connection between the lead screw nut and the mounting part is welding or riveting.

[0014] or,

[0015] The lead screw nut and the mounting part are integrally formed.

[0016] Preferably, at least one of the lead screw nut and the mounting part is made of polymer.

[0017] Preferably, the mounting portion includes a front portion, a middle portion, and a rear portion distributed along the axis, and the lead screw nut is located in the middle portion of the mounting portion.

[0018] Preferably, it further includes a snap-fit ​​component, wherein one end of the snap-fit ​​component that is adapted to the slot A is a snap-fit ​​end; when the slot A is a through slot, the snap-fit ​​end does not protrude from the threaded portion of the lead screw nut when the snap-fit ​​component is embedded in the slot A.

[0019] Preferably, the snap-fit ​​component is connected to the slot A by an interference fit.

[0020] Preferably, the other end of the snap-fit ​​component opposite to the snap-fit ​​end is a connecting end, and the connecting end is provided with an anti-detachment part A for preventing detachment when connected to an external component.

[0021] Preferably, the anti-detachment part A is a wedge-shaped protrusion formed from the end face of the connecting end, and the top surface of the protrusion is not parallel to the end face.

[0022] Preferably, when the number of card slots A is not less than two, the plurality of card slots A are arranged in an array in the circumferential direction of the mounting portion.

[0023] Preferably, the device includes the driven member as described above, as well as a fixed shaft, a lead screw, an inner cylinder, and an outer cylinder. A hole extending from one end of the fixed shaft to the other end is provided, and a through groove is provided on the wall of the hole along the radial direction of the fixed shaft. The driven member is sleeved on the lead screw through the lead screw nut, and the driven member is located in the hole. The inner cylinder is sleeved on the fixed shaft, and the inner cylinder and the driven member are connected by a snap-fit ​​member passing through the through groove. The outer cylinder is sleeved on the inner cylinder.

[0024] This invention further proposes a photovoltaic tracking device, including the aforementioned transmission component.

[0025] The beneficial effects of this utility model are:

[0026] 1. Simple installation and easy disassembly, suitable for space-constrained or highly integrated environments: By providing a slot A on the mounting part for connecting with external components, the external component can be connected to the driven component by inserting the snap-fit ​​part into the slot A during use, thus making installation simple and disassembly easy; at the same time, since the slot A is provided on the outer circumference of the mounting part, the radial dimension of the mounting part or the radial dimension of the lead screw nut is the maximum dimension of the driven component proposed in this application. Compared with existing lead screw nuts, since no mounting flange is required, the radial dimension can be smaller. Therefore, the driven component proposed in this application is suitable for space-constrained or highly integrated environments.

[0027] 2. Enhanced practicality and applicability to various application scenarios: When the lead screw nut and mounting part are detachable, it facilitates the replacement, repair, or upgrading of components, thereby extending the product's service life and reducing maintenance costs; while when the lead screw nut and mounting part are not detachable, the structural connection strength between the two is better, thus ensuring better reliability and safety when using the follower proposed in this application, whether for long-term continuous use or under high load or extreme environmental conditions; therefore, the follower proposed in this application is more practical and applicable to more application scenarios.

[0028] 3. Smoother and more reliable transmission: Through multiple arrayed slots A, and in conjunction with multiple locking components, the force distribution on the driven component during operation is more uniform. When the driven component is subjected to uniform force, it can operate more smoothly, reducing wear and damage caused by uneven force, and extending the service life of mechanical components.

[0029] 4. Self-lubricating and lightweight: The lead screw nut is made of specific polymer materials (such as nylon, PTFE, etc.), giving it excellent corrosion resistance, self-lubricating properties, and lightweight advantages. Combined with a metal mounting section, this combination not only ensures the lightweight nature of the connection system but also provides the necessary mechanical strength and durability through the metal mounting section, thereby optimizing the overall structural performance. This material combination strategy effectively balances weight and strength requirements, making it suitable for various applications requiring corrosion resistance and self-lubrication, while maintaining the overall durability and reliability of the system. In some implementations, both the lead screw nut and the mounting section are integrally injection-molded polymers. This material combination provides sufficient performance to meet application requirements while improving transmission self-lubrication capabilities, reducing costs, and lightening weight. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the first embodiment of the follower in this example.

[0031] Figure 2 for Figure 1A schematic diagram of its breakdown.

[0032] Figure 3 This is a schematic diagram of the second implementation of the follower in this embodiment.

[0033] Figure 4 This is a schematic diagram of the third implementation of the follower in this embodiment.

[0034] Figure 5 This is a schematic diagram of the driven member and the snap-fit ​​member in this embodiment.

[0035] Figure 6 for Figure 5 A schematic diagram of its breakdown.

[0036] Figure 7 for Figure 5 A cross-sectional schematic diagram.

[0037] Figure 8 A schematic diagram of the transmission assembly in this embodiment.

[0038] Figure 9 for Figure 8 A schematic diagram of its breakdown.

[0039] Figure 10 This is a schematic diagram of the photovoltaic tracking device in this embodiment.

[0040] in:

[0041] 1. Driven component;

[0042] 11. Lead screw nut; 111. Connecting part B; 112. Slot B; 113. Nut part;

[0043] 12. Mounting part; 121. Slot A; 122. Connecting part A; 123. Bending part; 124. Riveting part; 125. Bayonet position; 126. Pipe sleeve; 127. Reinforcing rib;

[0044] 13. Snap-fit ​​connector; 131. Anti-slip part A; 132. Anti-slip part B;

[0045] 2. Transmission assembly; 21. Lead screw; 22. Fixed shaft; 23. Inner cylinder; 24. Outer cylinder;

[0046] 3. Photovoltaic panels;

[0047] 4. Columns; Detailed Implementation

[0048] The present invention will be further described in detail below with reference to the accompanying drawings.

[0049] like Figures 1 to 3As shown, a driven member 1 includes a lead screw nut 11 extending along an axis and a cylindrical mounting portion 12. The lead screw nut 11 is fixedly connected to the mounting portion 12, and the circumferential surface of the mounting portion 12 is provided with at least one slot A121 for connecting an external component.

[0050] When there are at least two slots A121, the multiple slots A121 are arranged in an array on the circumferential surface of the mounting part. This design ensures that the force distribution on the driven member 1 during operation is more uniform, reducing wear and damage caused by uneven force and extending the service life of mechanical parts.

[0051] The fixed connection between the lead screw nut 11 and the mounting part 12 can be in two ways: the first is a detachable connection; the second is a non-detachable connection. These are described below:

[0052] When the lead screw nut 11 and the mounting part 12 are detachably connected, this can be achieved in at least the following ways:

[0053] In the first embodiment, to ensure that the mounting part and the lead screw nut cannot rotate relative to each other circumferentially along the lead screw nut, and to ensure that the lead screw nut and the mounting part cannot move relative to each other axially along the lead screw nut, it is necessary to provide protrusions or recesses on the lead screw nut. For example... Figure 2 As shown, the mounting part 12 includes a bent portion 123. The outer circumferential surface of the lead screw nut 11 has a groove B112 that matches the bent portion 123. By pressing the bent portion 123 into the groove B112, the mounting part 12 and the lead screw nut 11 are fixedly connected. This bent connection method requires no special tools, is easy to install, and is convenient to disassemble. In some embodiments, the bent portion 123 is not present; after the connecting portion A122 and the connecting portion B111 are fitted together, the lead screw nut 11 and the mounting part 12 are fixedly connected by welding or other methods.

[0054] To further enhance the circumferential holding force between the mounting part and the lead screw nut, in some embodiments, the mounting part 12 further includes a connecting part A122. The connecting part A122 has a non-circular cross-section, and the lead screw nut 11 has a connecting part B111 that mates with the connecting part A122. Through the cooperation of the connecting parts A122 and B111, the lead screw nut 11 and the mounting part 12 can only move axially after connection. The cross-sectional shapes of the connecting parts A122 and B111 are not limited to... Figure 2 The octagonal shape can be a polygon or an ellipse, etc. The non-circular cross-section design prevents relative rotation between the mounting part 12 and the lead screw nut 11, while also facilitating disassembly, making its application more flexible and versatile. It can be directly applied in some implementations that require unidirectional movement of the lead screw nut 11.

[0055] The second implementation method, such as Figure 3 As shown (only mounting part 12), mounting part 12 is made of a flexible and deformable material. Mounting part 12 includes a bayonet position 125 and a riveting part 124. The bayonet position 125 can be opened and closed. It can be fixedly connected to the lead screw nut 11 through the opening and closing of the bayonet position 125 and the engagement of the riveting part 124. This connection method facilitates assembly and disassembly, enhancing the flexibility of the connection. Its wide adaptability makes it suitable for various application scenarios, especially in environments requiring rapid assembly and disassembly or where space is limited.

[0056] The use of detachable connections offers greater flexibility and ease of maintenance. However, this isn't limited to the combination of connectors A122 and B111; other methods can achieve the same result. For example, threaded connections, riveting, and snap-fit ​​connections allow for easy separation of the lead screw nut 11 and mounting part 12 when needed, facilitating component replacement, maintenance, or upgrades, ensuring interchangeability, extending product lifespan, and reducing maintenance costs. Furthermore, detachable connections can accommodate adjustments during assembly and disassembly, improving assembly flexibility.

[0057] When the lead screw nut 11 and the mounting part 12 are non-detachably connected: For example Figure 4 As shown, in the third embodiment of this invention, the lead screw nut 11 and the mounting portion 12 are integrally formed, and a sleeve 126 is also included. The sleeve 126 is fitted onto the mounting portion 12 and / or the lead screw nut 11, and when the sleeve 126 is fitted onto the mounting portion 12, the sleeve 126 has a through hole corresponding to the position of the slot A121. The sleeve 126, which wraps around the outer peripheral surface of the driven member 1, improves the overall strength of the driven member 1.

[0058] The main implementation methods of this approach include casting, injection molding, welding, or riveting, providing high structural stability and durability. This connection method ensures reliability and safety under long-term use, high load, or extreme environmental conditions by permanently fixing the screw nut 11 and mounting part 12 (forced disassembly may damage the structure). For example, fixing certain structural components reduces maintenance needs and improves the overall structural stability; the connection method needs to be determined based on the specific application scenario and circumstances.

[0059] Regarding the materials of the lead screw nut 11 and the mounting part 12, there are multiple options depending on the application scenario:

[0060] Option 1: The lead screw nut 11 is made of polymer, and the mounting part 12 is made of metal. For example... Figures 1 to 3As shown, the lead screw nut 11 is made of a specific polymer material (such as nylon, PTFE, etc.), which has excellent corrosion resistance, self-lubricating properties, and lightweight advantages. Combined with a metal mounting part 12, this combination not only ensures the lightweight nature of the connection system but also provides the necessary mechanical strength and durability through the metal mounting part 12, thereby optimizing the overall structural performance. This material combination strategy effectively balances the requirements of weight and strength, making it suitable for various applications requiring corrosion resistance and self-lubricating properties, while maintaining the overall durability and reliability of the system.

[0061] The second option involves a metal lead screw nut 11 and a polymer mounting part 12. In this embodiment, a certain strength is usually required for the lead screw nut 11. Metal is chosen to manufacture the lead screw nut 11, utilizing its excellent mechanical strength and wear resistance to ensure the stability and durability of the connection point. Meanwhile, the mounting part 12 is made of a polymer material, such as nylon or PTFE. This configuration not only significantly reduces the overall weight but also provides corrosion resistance. It can be further adjusted to meet specific application requirements, achieving both high structural efficiency and cost-effectiveness.

[0062] The third option: Both the lead screw nut 11 and the mounting part 12 are made of metal. This material combination provides high mechanical strength, wear resistance, and thermal stability, enabling it to withstand complex working conditions and long-term use. Applications include aerospace, automotive manufacturing, and heavy industry.

[0063] The fourth option: Both the lead screw nut 11 and the mounting part 12 are made of polymer, and can be either separately connected or integrally injection molded. This material combination provides sufficient performance to meet application requirements while improving the transmission's self-lubricating ability, and also reduces cost and weight.

[0064] It should be noted that various polymer materials can be selected for the use of lead screw nuts 11 to meet different performance requirements and application environments. Commonly used polymers include polytetrafluoroethylene (PTFE), polyimide (PI), nylon (such as PA6, PA66), polycarbonate (PC), and polyoxymethylene (POM). PTFE is widely used in applications requiring self-lubrication due to its excellent chemical stability and extremely low coefficient of friction. Polyimide has excellent high-temperature resistance and is suitable for high-temperature environments. Nylon is suitable for most ordinary load conditions due to its good mechanical properties and economy. Polycarbonate and polyoxymethylene are used in precision machinery due to their good strength, rigidity, and dimensional stability. These polymers each have their own characteristics, and by selecting the appropriate material type, the material can be chosen according to the specific working conditions and performance requirements.

[0065] like Figures 5 to 7In the illustrated embodiment, the lead screw nut 11 and the mounting portion 12 are integrally molded polymers. The lead screw nut 11 includes a threaded portion 113, and the mounting portion 12 includes a front portion, a middle portion, and a rear portion distributed along the axis, with the nut portion 113 located in the middle of the mounting portion. The threaded portion 113 does not extend through the entire driven member 1. This arrangement facilitates machining, and because the threaded portion 113 is not excessively long, the engagement between the driven member 1 and the lead screw 21 is smoother, preventing deformation of the threaded portion 113 during use.

[0066] The driven member 1 also includes a snap-fit ​​member 13 that mates with the slot A121, wherein one end of the snap-fit ​​member 13 that is adapted to the slot A121 is a snap-fit ​​end. In embodiments where the slot A121 is a through slot, one end of the snap-fit ​​member 13 is embedded in the slot A121, and the embedded snap-fit ​​end does not protrude from the threaded portion of the lead screw nut 11, similar to the above, to avoid affecting the transmission fit between the lead screw nut 11 and the lead screw. The snap-fit ​​member 13 can be at least one of a pin, bolt, dowel, or key, and can be adjusted according to actual structural requirements. Figure 9 In the embodiment shown, the snap-fit ​​component 13 is in the form of a pin.

[0067] like Figures 5 to 7 In the illustrated embodiment, the snap-fit ​​member 13 and the slot A121 are connected by an interference fit. Furthermore, at the connection point between the snap-fit ​​member 13 and the slot A121, mutually cooperating protrusions and recesses are provided to make the connection between the two more secure. This prevents the connection between the snap-fit ​​member 13 and the mounting part 12 from becoming loose during movement, ensuring that the driven member 13 is more stable during transmission.

[0068] This utility model also proposes a transmission component 2, such as Figure 8 and Figure 9 As shown, the device includes the aforementioned driven member 1, as well as a fixed shaft 22, a lead screw 21, an inner cylinder 23, and an outer cylinder 24. A hole extending from one end of the fixed shaft 22 towards the other end is provided, and a through groove is provided on the hole wall along the radial direction of the fixed shaft 22. The driven member 1 is sleeved on the lead screw 21 via a lead screw nut 11, and is located within the hole. The inner cylinder 23 is sleeved on the fixed shaft 22, and the inner cylinder 23 and the driven member 1 are connected by a snap-fit ​​member 13 passing through the through groove. The outer cylinder 24 is sleeved on the inner cylinder 23.

[0069] The motion process is as follows: the rotation of the lead screw 21 drives the driven member 1 and the inner cylinder 23 to move linearly along the fixed shaft 22. The outer circumferential surface of the inner cylinder 23 and the inner circumferential surface of the outer cylinder 24 are provided with mutually cooperating helical splines. When the inner cylinder 23 moves along the fixed shaft 22, the outer cylinder 24 rotates around the axis of the inner cylinder 23 under the cooperation of the helical splines. The snap-fit ​​member 13 can slide within the stroke range of the through groove, and the through groove and the snap-fit ​​member 13 are tightly fitted. This design makes the transmission assembly 2 more stable and reliable during movement.

[0070] like Figure 9 In some embodiments shown, the inner circumferential surface of the inner cylinder 23 is provided with a groove C, and the other end of the snap fastener 13 is embedded in the groove C, thereby fixing the inner cylinder 23 and the driven member 1 together.

[0071] like Figures 5 to 7 In the illustrated embodiment, the other end of the snap-fit ​​member 13 opposite to the snap-fit ​​end is a connecting end. The connecting end is provided with an anti-detachment structure for external connection, including an anti-detachment part A131 and an anti-detachment part B132. The inner cylinder 23 is provided with a structure that mates with the anti-detachment parts A131 and B132. Furthermore, as... Figure 7 As shown, the anti-detachment part A131 is a wedge-shaped protrusion formed from the end face of the aforementioned connecting end, and the top surface of the protrusion is not parallel to the end face. In some embodiments, the end of the anti-detachment part B132 furthest from the edge is rectangular, so that when the wedge-shaped anti-detachment part A131 is pressed into the inner cylinder, it cooperates with the anti-detachment part B132 to fix the follower 1 and the inner cylinder 23. In other embodiments, only the anti-detachment part A131 and its cooperation with the slot C are needed to achieve a fixed connection between the two.

[0072] In other embodiments, one end of the slot C extends axially along the inner cylinder and to the end of the inner cylinder 23, and an anti-detachment structure is provided on the slot C and / or the locking member 13. At least one of the slot C or the anti-detachment structure has deformable capability. When the inner cylinder 23 is fitted onto the driven member 1, the slot C or the anti-detachment structure deforms until the inner cylinder 23 and the driven member 1 are installed in a predetermined position, at which point the slot C or the anti-detachment structure returns to its initial state, and the inner cylinder 23 and the driven member 1 are fixedly connected. When the lead screw 21 drives the driven member 1 and the inner cylinder 23 to move, the force N1 applied directly or indirectly to the slot C or the anti-detachment structure is less than the force required for the inner cylinder 23 and the driven member 1 to deform and separate. This ensures more stable and safer movement of the transmission assembly 2.

[0073] In some embodiments, the driven member 1 is further provided with a sliding part A, and the fixed shaft 22 is provided with a sliding part B that cooperates with the sliding part A. The sliding parts A and B allow the driven member 1 to move linearly on the fixed shaft 22. The sliding parts A and B can take various forms, such as guide grooves and guide pins, straight splines, etc.

[0074] This utility model also proposes a photovoltaic tracking device, such as Figure 7 As shown, the system includes the aforementioned transmission component 2, as well as a column 4 and a photovoltaic panel 3. The column 4, transmission component 2, and photovoltaic panel 3 are connected in sequence. Under the action of the transmission component 2, the photovoltaic panel 3 can rotate around the axis of the transmission component 2, thereby achieving solar tracking. Moreover, in the event of severe weather or emergencies, the photovoltaic panel 3 can be folded up to the vicinity of the column 4, reducing the overall size, mitigating the impact of wind, snow, etc., on the photovoltaic panel 3, and extending its service life.

[0075] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0076] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0077] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0078] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0079] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A driven member, characterized in that: include, Screw nut It also includes a cylindrical mounting part, which is fixedly connected to the lead screw nut, and the mounting part has at least one slot A for connecting external components on its circumferential surface.

2. The driven member as described in claim 1, characterized in that: The mounting part includes a connecting part A, the cross-section of which is non-circular. The lead screw nut is provided with a connecting part B that mates with the connecting part A. The lead screw nut is fixedly connected to the connecting part A of the mounting part through the connecting part B. or, The mounting part includes a bending part, and the outer peripheral surface of the lead screw nut is provided with a groove B that mates with the bending part. The lead screw nut is embedded in the mounting part, and the bending part is embedded in the groove B. or, The connection between the lead screw nut and the mounting part is welding or riveting. or, The lead screw nut and the mounting part are integrally formed.

3. The driven member as described in claim 1, characterized in that: At least one of the lead screw nut and the mounting part is made of polymer.

4. The driven member as described in claim 1, characterized in that: The mounting section includes a front section, a middle section, and a rear section distributed along the axis, with the lead screw nut located in the middle section of the mounting section.

5. The follower as described in any one of claims 1 to 4, characterized in that: It also includes a snap-fit ​​component, wherein one end of the snap-fit ​​component that is adapted to the slot A is a snap-fit ​​end; when the slot A is a through slot, the snap-fit ​​end does not protrude from the threaded portion of the lead screw nut when the snap-fit ​​component is embedded in the slot A.

6. The driven member as described in claim 5, characterized in that: The snap-fit ​​connector is connected to the slot A by an interference fit.

7. The driven member as described in claim 5, characterized in that: The other end of the snap-fit ​​component opposite to the snap-fit ​​end is the connecting end, and the connecting end is provided with an anti-detachment part A for preventing detachment when connected to an external component.

8. The driven member as described in claim 7, characterized in that: The anti-detachment part A is a wedge-shaped protrusion formed from the end face of the connecting end, and the top surface of the protrusion is not parallel to the end face.

9. The driven member as claimed in claim 1, characterized in that: When there are at least two card slots A, the plurality of card slots A are arranged in an array in the circumferential direction of the mounting part.

10. A transmission assembly, characterized in that: The device includes a driven member as described in any one of claims 1 to 9, and further includes a fixed shaft, a lead screw, an inner cylinder, and an outer cylinder. A hole extending from one end of the fixed shaft to the other end is provided, and a through groove is provided on the wall of the hole along the radial direction of the fixed shaft. The driven member is sleeved on the lead screw through the lead screw nut, and the driven member is located in the hole. The inner cylinder is sleeved on the fixed shaft, and the inner cylinder and the driven member are connected by a snap-fit ​​member passing through the through groove. The outer cylinder is sleeved on the inner cylinder.

11. A photovoltaic tracking device, characterized in that: Includes the transmission assembly as described in claim 10.

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