Shaft suitable for power assisting device, power assisting device and photovoltaic tracking system

Abstract

The utility model discloses a shaft suitable for a power assisting device, the power assisting device and a photovoltaic tracking system, and relates to the technical field of power assisting machinery of rotating shafts, in particular to the shaft suitable for the power assisting device, which comprises a driving section used for being connected with an external power source; the connecting section extends along the axis of the driving section from one end of the driving section, and the connecting section is provided with a connecting part used for installing a power assisting unit in the power assisting device; and the first limiting part is used for limiting the position, relative to the connecting part, of the power assisting unit mounted on the connecting part. The power assisting device has the advantages that the power assisting device can be conveniently, rapidly and stably assembled, and meanwhile the working stability of the power assisting device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power-assisting machinery of rotating shafts, and in particular to a shaft suitable for a power-assisting device, a power-assisting device and a photovoltaic tracking system. Background Art

[0002] Shaft transmission technology is widely used. In such applications, the rotating shaft is usually set horizontally, or in other words, it is not set vertically. At this time, the load driven by the rotating shaft, such as windows, car doors, photovoltaic panels, etc., is offset, resulting in the center of gravity of the load driven by the rotating shaft and the central axis of the rotating shaft cannot coincide with each other. Therefore, during the rotation process, the center of gravity of the load driven by the rotating shaft will also rotate around the rotating shaft. Therefore, when the rotating shaft drives the load to move, the following two situations will occur: First, the center of gravity moves from a high place to a low place. At this time, the torque output by the power source (such as a motor) used to drive the load to move through the rotating shaft is usually to keep the load from rotating freely, that is, to overcome the influence of gravity; second, the center of gravity moves from a low place to a high place. At this time, the torque output by the power source must not only overcome the effect of gravity, but also be able to drive the load to move.

[0003] In the above two cases, when the center of gravity of the load and the central axis of the rotating shaft are at the same horizontal position, the gravity influence of the load is the greatest.

[0004] As a result, when selecting a power source for driving a load driven by a non-vertically arranged transmission shaft to rotate around the axis, the selection of the power source must consider the situation where the torque it outputs can satisfy the situation when the center of gravity of the load is at the same horizontal position as the central axis of the rotating shaft. When the load rotates around the axis, the power source will have excess power, thereby increasing costs.

[0005] To solve this problem, our company previously proposed a patent with application number 2024207976907, which disclosed a power assist device and a photovoltaic tracking system for a rotating shaft. The power assist device is connected to the power source through a rotating shaft to provide assistance for the power source to drive the load to move around the axis.

[0006] In the above application, the rotating shaft and the power-assisting device are directly connected through a spline to form a transmission connection. When the rotating shaft drives the load to rotate through the auxiliary power source of the power-assisting device, the elastic parts in the power-assisting device need to be deformed, thereby causing uncontrollable displacement of different groups of power-assisting units on the rotating shaft. Therefore, how to achieve the transmission connection between the rotating shaft and the power-assisting device is a problem that needs to be solved urgently. Utility Model Content

[0007] The first object of the utility model is to provide a shaft suitable for a power-assisting device to solve the problem of transmission connection between the shaft and the power-assisting device. The second object of the utility model is to provide a power-assisting device. The third object of the utility model is to provide a photovoltaic tracking system.

[0008] The implementation of the utility model is completed by the following technical solutions:

[0009] As a first aspect of the utility model, a shaft suitable for a power assist device comprises:

[0010] A driving section, used for connecting to an external power source;

[0011] A connecting section extends from one end of the driving section and along the axis of the driving section, and is provided with:

[0012] A connecting part, used for installing a power-assisting unit in a power-assisting device;

[0013] The first limiting portion is used to limit the position of the power-assisting unit installed on the connecting portion relative to the connecting portion.

[0014] Optionally, the connecting section is further provided with a second limiting portion, and the second limiting portion is provided at an end of the connecting section close to the driving section.

[0015] Optionally, the connecting section further comprises a limiting member, and the limiting member is arranged at one end of the connecting section close to the driving section.

[0016] Optionally, the connecting portion extends in a ring shape along the circumference of the connecting section.

[0017] Optionally, the first limiting portion extends in a ring shape along the circumference of the connecting section.

[0018] Optionally, a first avoidance groove is provided on the outer peripheral surface of the connecting section, and the first avoidance groove starts from an end of the connecting section away from the driving section and extends along the axial direction of the connecting section toward the driving section.

[0019] Optionally, a second avoidance groove is further included, and the second avoidance groove is arranged along the circumference of the connecting section.

[0020] Optionally, the number of the connecting parts and the second avoidance grooves is equal and at least one. When the number of the connecting parts is more than two, the number of the second avoidance grooves is consistent with the number of the connecting parts. After a plurality of the connecting parts and a plurality of the second avoidance grooves are combined in a one-to-one correspondence, they are sequentially arranged along the axial direction of the connecting section.

[0021] As a second aspect of the present utility model, a power assist device includes:

[0022] A fixing member, used for fixing and connecting with the outside, wherein the fixing member is provided with a through hole;

[0023] The shaft suitable for the power-assisting device as described above is passed through the through hole of the fixing member;

[0024] At least one group of power-assisting units is arranged between the shaft and the fixing member. When there are more than two groups of power-assisting units, the multiple groups of power-assisting units are coaxially arranged along the axis of the connecting section.

[0025] The power assist unit comprises:

[0026] A movable member, sleeved on the shaft and connected to the connecting portion, wherein the movable member is provided with a limiting member for cooperating with the first limiting portion;

[0027] A coil spring, the coil spring comprising an outer end and an inner end, the outer end of the coil spring being connected to the fixing member;

[0028] A follower is connected to the inner end of the coil spring. The follower is arranged on one side of the movable member and forms a rotational fit with the movable member. The follower includes a transition portion, which is arranged between the fixed member and the movable member. The transition portion is used to connect with the fixed member to maintain the deformation of the coil spring or to connect with the movable member to allow the coil spring to deform.

[0029] As a third aspect of the present utility model, a photovoltaic tracking system includes the above-mentioned power assisting device.

[0030] The utility model has the advantages of being convenient for assembling the power-assisting device quickly and stably and improving the working stability of the power-assisting device at the same time.

[0031] First, when installing the power-assisting unit in the power-assisting device to the connecting section of the shaft proposed in the present application, the power-assisting unit is sleeved on the connecting section and connected to the corresponding connecting part. The power-assisting unit is confined to the connecting part by the first limiting part, so that the power-assisting unit can be installed quickly and accurately to the predetermined position.

[0032] Second, when there are multiple connecting parts in the shaft proposed in the present application, power-assisting units with the same number of connecting parts can be set, and the power-assisting units can be connected to the connecting parts one by one. Through the first limiting part corresponding to the connecting part, the position of the corresponding power-assisting unit can be limited, which prevents the power-assisting unit from sliding freely relative to the shaft, thereby improving the stability of the power-assisting device during use.

[0033] Third, to ensure the connection between the inner end of the coil spring and the follower, optimally, the inner end of the coil spring should protrude from the connection point. As a result, during installation, the inner end of the coil spring is very likely to interfere with the shaft proposed in the present application. By providing a first avoidance groove, interference between the inner end of the coil spring and the shaft proposed in the present application can be avoided during assembly of the power assist device, which also makes assembly of the power assist device more convenient. Furthermore, by providing a second avoidance groove, interference between the inner end of the coil spring and the shaft can be avoided when the power assist device is working and the follower in the power assist unit rotates relative to the shaft, thereby avoiding deformation of the inner end of the coil spring or the inner end of the coil spring falling off the follower.

[0034] Fourthly, a second limiting portion is provided at one end of the connecting section near the driving section of the shaft proposed in the present application, so as to avoid squeezing and interference of the power assisting unit by the fixing parts in the power assisting device.

[0035] Sixth, when the power-assisting device includes a group of power-assisting units, one end of the power-assisting unit is a driven part, and the other end is a movable part. Similarly, when the power-assisting device includes multiple groups of power-assisting units, after the multiple groups of power-assisting units are coaxially arranged in sequence, one end of the combined whole is a driven part, and the other end is a movable part. Since the coil spring in the power-assisting device is connected to the driven part, and the driven part is rotatably connected to the movable part, it is necessary to prevent the driven part located at the end of the power-assisting device from moving axially. Therefore, the limit member set in the shaft proposed in the present application can effectively limit the follower, prevent the follower from unexpected movement, and improve the working stability of the power-assisting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The following drawings describe in detail the exemplary embodiments disclosed in this application. The same reference numerals represent similar structures in several views of the drawings. Those skilled in the art will understand that these embodiments are non-limiting, exemplary embodiments, and the drawings are only for the purpose of illustration and description, and are not intended to limit the scope of this application. Other embodiments may also accomplish the application intent in this application. It should be understood that the drawings are not drawn to scale. Among them:

[0037] Figure 1 This is a schematic diagram of a shaft suitable for a power assist device in an embodiment of the present application;

[0038] Figure 2 for Figure 1 Schematic diagram of the middle limiter;

[0039] Figure 3 This is a schematic diagram of a power assist device in an embodiment of the present application;

[0040] Figure 4 for Figure 3 Explosion diagram of

[0041] Figure 5 for Figure 4 Schematic diagram of the central assist unit.

[0042] The marks in the figure are:

[0043] 1. shaft; 11. connecting section; 111. connecting part; 112. first avoidance groove; 113. second avoidance groove; 114. first limiting part; 115. second limiting part; 12. driving section; 13. limiting member; 131. plug-in interface;

[0044] 2. Fixing member; 21. Retaining groove;

[0045] 3. Power assist unit; 31. Movable member; 311. Third avoidance groove; 312. Limiting member; 32. Follower member; 33. Coil spring. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the embodiment of the present application will be clearly and completely described below in conjunction with the drawings of the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application. It can be understood that, in the absence of conflict, some technical means of the various embodiments described herein can be replaced or combined with each other.

[0047] In the description of this application, if there are terms such as "first", "second", etc., they are only used to distinguish the objects described and do not have any order or technical meaning. Therefore, an object defined as "first", "second", etc. may explicitly or implicitly include one or more of the objects. In addition, "one" or "a" and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one, and "multiple" means no less than two.

[0048] In the description of this application, if there are terms such as "connection", "abutment", "installation", "fixation", "contact", "support", "housing", etc., they should be understood in a broad sense. For example, "connection" can be a split connection or an integrated connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a non-detachable connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can also be the internal connection of two elements or the interaction relationship between two elements. For another example, "abutment" can be a direct abutment or an indirect abutment through an intermediate medium. For another example, "housing" does not necessarily mean complete housing as a whole. The concept also includes the situation where a part protrudes from the outside. For those skilled in the art, the specific meanings of the aforementioned terms in this application can be understood according to the specific circumstances.

[0049] In the description of this application, if there are similar terms such as “A is connected to B in a rotatable manner”, it means that A and B are directly or indirectly connected, and A can rotate relative to B.

[0050] In the description of the specification of the present application, reference to "one embodiment" or "some embodiments" etc. means that one or more embodiments of the present application include a specific feature, structure or characteristic described in conjunction with the embodiment. Therefore, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in the specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0051] As a first aspect of this embodiment, Figures 1 to 5 As shown, a shaft suitable for a power assist device is disclosed, comprising:

[0052] A driving section 12, used to connect to an external power source;

[0053] The connecting section 11 extends from one end of the driving section 12 along the axis of the driving section 12, and is provided with:

[0054] The connecting portion 111 is used for installing the power-assisting unit 3 in the power-assisting device;

[0055] The first limiting portion 114 is used to limit the position of the power-assisting unit 3 installed on the connecting portion 111 relative to the connecting portion 111 .

[0056] It should be noted that, in this embodiment, the driving section 12 is used to connect to an external power source. When in use, the driving section 12 can be directly connected to the power source, or the driving section 12 can be connected to a load driven by the power source. The driving section 12 can be connected to the external power source in the following ways, including but not limited to:

[0057] First, the shaft 1 disclosed in this embodiment is coaxially arranged with the output end of the power source through the driving section 12 and then welded;

[0058] Second, the shaft 1 disclosed in this embodiment is connected to the output end of the power source through the driving section 12 through a flange;

[0059] The third type is that a tooth block or a gear is provided on the driving section 12, and a tooth block or a gear matching with the driving section 12 is provided at the output end of the power source. The shaft 1 disclosed in this embodiment forms a gear transmission with the output end of the power source through the driving section 12.

[0060] It should be noted that, in this embodiment, the first limiting portion 114 may be a protrusion or a depression on the connecting portion 111 , or a protrusion or a depression extending in a ring shape along the circumference of the connecting portion 111 .

[0061] It should be noted that, in this embodiment, the connecting portion 111 on the connecting section 11 is used to connect with the power-assisting device. To facilitate the connection between the connecting portion 111 and the power-assisting device to achieve transmission, as a preferred embodiment, Figure 1 and Figure 4 As shown, the connection portion 111 is an external spline.

[0062] like Figure 1 and Figure 4 As shown, it should be noted that, in this embodiment, the shaft 1 disclosed in this embodiment is further provided with a second limiting portion 115 , and the second limiting portion 115 is provided at one end of the connecting section 11 close to the driving section 12 .

[0063] Furthermore, in this embodiment, the shaft 1 disclosed in this embodiment further includes a limit member 13 , and the limit member 13 is disposed at one end of the connecting section 11 close to the driving section 12 .

[0064] Furthermore, in this embodiment, the connection method of the limiting member 13 and the connecting section 11 is as follows:

[0065] Fixed connection, for example, the limiting member 13 is welded on the connecting section 11;

[0066] Or a detachable connection, for example, a plug-in port 131 is provided on the limiting member 13, and the limiting member 13 is sleeved on the connecting section 11 through the plug-in port 131, so as to facilitate the disassembly or installation of the limiting member 13; when the limiting member 13 is plugged into the connecting section 11, one end of the limiting member 13 abuts against the second limiting portion 115.

[0067] like Figure 1 and Figure 4 As shown, it should be noted that, in this embodiment, a first avoidance groove 112 is provided on the outer peripheral surface of the connecting section 11, and the first avoidance groove 112 extends from one end of the connecting section 11 away from the driving section 12 along the axial direction of the connecting section 11 toward the driving section 12.

[0068] like Figure 1 and Figure 4 As shown, it should be noted that, in this embodiment, the shaft 1 disclosed in this embodiment further includes a second avoidance groove 113 , and the second avoidance groove 113 is arranged along the circumferential direction of the connecting section 11 .

[0069] Furthermore, in this embodiment, the number of the connecting parts 111 and the second avoidance grooves 113 is equal and there is at least one. When the number of the connecting parts 111 and the second avoidance grooves 113 is two or more, a plurality of the connecting parts 111 and a plurality of the second avoidance grooves 113 are combined one by one and are arranged in sequence along the axial direction of the connecting section 11.

[0070] As a second aspect of this embodiment, Figures 3 to 5 As shown, this embodiment also discloses a power assist device, including:

[0071] A fixing member 2, used for fixing and connecting with the outside, and the fixing member 2 is provided with a through hole;

[0072] The shaft 1 suitable for the power-assisting device as described above is passed through the through hole of the fixing member 2;

[0073] At least one group of power-assisting units 3 is disposed between the shaft 1 and the fixing member 2 disclosed in this embodiment. When there are two or more groups of power-assisting units 3, the multiple groups of power-assisting units 3 are coaxially disposed along the axis of the connecting section 11.

[0074] The booster unit 3 comprises:

[0075] The movable member 31 is sleeved on the shaft 1 disclosed in this embodiment and connected to the connecting portion 111. The movable member 31 is provided with a limiting member 312 for cooperating with the first limiting portion 114.

[0076] A coil spring 33, wherein the coil spring 33 comprises an outer end and an inner end, and the outer end of the coil spring 33 is connected to the fixing member 2;

[0077] The follower 32 is connected to the inner end of the coil spring 33. The follower 32 is arranged on one side of the movable part 31 and forms a rotational fit with the movable part 31. The follower 32 includes a transition portion, which is arranged between the fixed part 2 and the movable part 31. The transition portion is used to connect with the fixed part 2 to maintain the deformation of the coil spring 33 or to connect with the movable part 31 to allow the coil spring 33 to deform.

[0078] It should be noted that, in this embodiment, in order to facilitate the connection between the connecting part 111 and the power-assisting device to achieve transmission, the movable part 31 is provided with an internal spline that cooperates with the connecting part 111, and the movable parts 31 of each group of power-assisting units 3 respectively cooperate with the external splines of the connecting part 111 at the corresponding position in the shaft 1 disclosed in this embodiment.

[0079] It should be noted that, in this embodiment, the fixing member 2 is provided with a retaining groove 21 that cooperates with the adapter portion, and the movable member 31 is provided with a third avoidance groove 311 that cooperates with the adapter portion.

[0080] It should be noted that, in the initial state, the assisting device is abutted by the fixing member 2, and the adapter is embedded in the third avoidance groove 311;

[0081] When the center of gravity of the load moves from a high position to a low position, the assisting device accumulates force, the movable member 31 rotates in this direction, and drives the driven member 32 to rotate through the third avoidance groove 311. The driven member 32 pulls the inner end of the coil spring 33 to deform it until it reaches a predetermined position. The adapter is separated from the third avoidance groove 311 and is embedded in the retaining groove 21 under the action of the movable member 31, so that the coil spring 33 is in a stable energy storage state.

[0082] When the center of gravity of the load moves from a low position to a high position, the movable part 31 rotates, and when it reaches a predetermined position, the adapter separates from the retaining groove 21 and is re-engaged in the third avoidance groove 311, and the elastic force of the coil spring 33 acts on the third avoidance groove 311 through the adapter to release energy, thereby assisting the movable part 31 to rotate until the coil spring 33 returns to its initial state.

[0083] It should be noted that, in this embodiment, when the first limiting portion 114 is a protrusion on the connecting portion 111, the limiting member 312 is a depression provided on the movable member 31, and cooperates with the protrusion on the first limiting portion 114 to limit the position of the movable member 31, that is, to limit the axial position of the power-assisting unit 3 in the connecting section 11;

[0084] like Figure 1 and Figure 4 As shown, to facilitate the assembly of the power assist device, preferably, the first limiting portion 114 is a depression on the connecting portion 111, and the limiting member 312 is a bolt or a columnar body provided on the movable member 31. At this time, the limiting member 312 is movably connected to the movable member 31 along the radial direction of the movable member 31 to achieve cooperation with the first limiting portion 114, wherein the limiting member 312 is movably connected to the movable member 31 along the radial direction of the movable member 31, and a reserved hole may be provided in the radial direction of the movable member 31, and the limiting member 312 is snap-connected or threadedly connected to the reserved hole on the movable member 31.

[0085] When there are multiple connecting parts 111, a same number of power-assisting units 3 can be provided, and the power-assisting units 3 can be connected to the connecting parts 111 one by one. The position of the corresponding power-assisting units 3 can be limited by the first limiting part 114 corresponding to the connecting part 111, so as to avoid the power-assisting units 3 from sliding freely relative to the shaft 1 disclosed in this embodiment, thereby improving the stability of the power-assisting device during use.

[0086] It should be noted that, in the present embodiment, the inner end of the coil spring 33 is connected to the follower 32, and the connection method may be a fixed connection, in which the inner end of the coil spring 33 is welded to the corresponding position of the follower 32; or, the connection method may be a detachable connection, in which a hook is provided at the inner end of the coil spring 33, and a hanging groove or a hanging column for cooperating with the hook is provided on the follower 32.

[0087] Furthermore, in this embodiment, if Figure 5 As shown, in order to ensure the stability of the connection between the inner end of the coil spring 33 and the follower 32, preferably, a hanging groove or a hanging column is provided on the follower 32, and the inner end of the coil spring 33 is hung on the hanging groove or the hanging column of the follower 32 through a hook, and the inner end of the coil spring 33 protrudes from the connection of the inner end of the follower 32, as shown in FIG. Figure 1 and Figure 4 As shown, by providing the first avoidance groove 112, interference between the inner end of the coil spring 33 and the shaft 1 disclosed in this embodiment is avoided when the power assist device is assembled, and the power assist device is more convenient to assemble; Figure 1 and Figure 4 As shown, by providing a second avoidance groove 113, interference between the inner end of the coil spring 33 and the disclosed shaft 1 is avoided when the assisting device is working and the driven member 32 in the assisting unit 3 rotates relative to the shaft 1 disclosed in this embodiment, thereby avoiding deformation of the inner end of the coil spring 33 or detachment of the inner end of the coil spring 33 from the driven member 32.

[0088] It should be noted that, in this embodiment, the shaft 1 and the fixing member 2 disclosed in this embodiment form a rotational fit, which can be a direct rotational fit or a rotational fit. Figure 4 As shown, the bearing on the fixing member 2 forms a rotational fit with the shaft 1 disclosed in this embodiment. In order to prevent the bearing on the fixing member 2 from squeezing the power assist unit 3, as shown in FIG. Figures 1 to 4 As shown, a second limiting portion 115 is further provided on the connecting section 11 in the shaft 1 disclosed in this embodiment. The second limiting portion 115 is used to limit the position of the bearing. Therefore, the second limiting portion 115 can be a protrusion provided on the connecting section 11, or a protruding ring, or a spline tooth like the connecting portion 111.

[0089] Furthermore, in the present embodiment, when the power-assisting device includes a group of power-assisting units 3, one end of the power-assisting unit 3 is a follower 32, and the other end is a movable part 31. Similarly, when the power-assisting device includes multiple groups of power-assisting units 3, after the multiple groups of power-assisting units 3 are coaxially arranged in sequence, one end of the combined whole is a follower 32, and the other end is a movable part 31. Since the coil spring 33 in the power-assisting device is connected to the follower 32, and the follower 32 is rotatably connected to the movable part 31, it is necessary to prevent the follower 32 located at the end of the power-assisting device from moving axially. Therefore, the limit member 13 provided in the shaft 1 proposed in the present application can effectively limit the follower 32, thereby preventing the follower 32 from having unexpected movement, thereby improving the working stability of the power-assisting device.

[0090] Furthermore, in this embodiment, the limiting member 13 can be connected to the bearing in the following manner:

[0091] First, the limiting member 13 is fixedly connected to the connecting section 11, for example, the limiting member 13 is welded to the connecting section 11;

[0092] Second, the stopper 13 is detachably connected to the connecting section 11, for example, Figure 1 and Figure 2 As shown, the limiting member 13 is provided with an inserting port 131 , and the limiting member 13 is clamped on the connecting section 11 through the inserting port 131 and abuts against the second limiting portion 115 .

[0093] As a third aspect of this embodiment, a photovoltaic tracking system includes a photovoltaic bracket and a photovoltaic panel, and the above-mentioned assisting device, wherein the fixed part 2 in the assisting device is connected to the photovoltaic bracket, and the movable part 31 in the assisting device is connected to the photovoltaic panel (ie, the load).

[0094] When the photovoltaic tracking system of this embodiment is working, the external power source drives the photovoltaic panel to rotate around the axis 1 disclosed in this embodiment to perform photovoltaic tracking. When the center of gravity of the photovoltaic panel moves from a high position to a low position, the coil spring 33 overcomes the influence of the photovoltaic panel's gravity on the output torque of the power source through the axis 1 disclosed in this embodiment when the photovoltaic panel moves from a high position to a low position, and energy storage is achieved through the deformation of the coil spring 33.

[0095] When the center of gravity moves from a low position to a high position, the coil spring 33 releases energy, and the energy stored in the coil spring 33 due to deformation is fully used to assist the power source to drive the photovoltaic panel to move from a low position to a high position, thereby reducing the pressure of the power source, reducing energy consumption, and being more economical and environmentally friendly.

Claims

1. A shaft suitable for a power assist device, characterized in that: include: A driving section, used for connecting to an external power source; A connecting section extends from one end of the driving section and along the axis of the driving section, and is provided with: A connecting part, used for installing a power-assisting unit in a power-assisting device; The first limiting portion is used to limit the position of the power-assisting unit installed on the connecting portion relative to the connecting portion.

2. The shaft suitable for a power assist device according to claim 1, characterized in that: A second limiting portion is also provided, and the second limiting portion is provided at one end of the connecting section close to the driving section.

3. The shaft suitable for a power assist device according to claim 1, characterized in that: It also includes a limiting member, which is arranged at one end of the connecting section close to the driving section.

4. The shaft suitable for a power assist device according to claim 1, characterized in that: The connecting portion extends in a ring shape along the circumference of the connecting section.

5. The shaft suitable for a power assist device according to claim 1, characterized in that: The first limiting portion extends in a ring shape along the circumference of the connecting section.

6. The shaft suitable for a power assist device according to claim 1, characterized in that: A first avoidance groove is provided on the outer peripheral surface of the connecting section. The first avoidance groove starts from an end of the connecting section away from the driving section and extends toward the driving section along the axial direction of the connecting section.

7. The shaft suitable for a power assist device according to any one of claims 1 to 6, characterized in that: It also includes a second avoidance groove, which is arranged along the circumference of the connecting section.

8. The shaft suitable for a power assist device according to claim 7, characterized in that: The number of the connecting parts and the second avoidance grooves is equal and there is at least one. When the number of the connecting parts is two or more, the number of the second avoidance grooves is consistent with the number of the connecting parts. After a plurality of the connecting parts and a plurality of the second avoidance grooves are combined in a one-to-one correspondence, they are arranged in sequence along the axial direction of the connecting section.

9. A power assist device, characterized in that: include: A fixing member, used for fixing and connecting with the outside, wherein the fixing member is provided with a through hole; The shaft suitable for the power assist device according to any one of claims 1 to 8, which is passed through the through hole of the fixing member; At least one group of power-assisting units is arranged between the shaft and the fixing member. When there are more than two groups of power-assisting units, the multiple groups of power-assisting units are coaxially arranged along the axis of the connecting section. The power assist unit comprises: A movable member, sleeved on the shaft and connected to the connecting portion, wherein the movable member is provided with a limiting member for cooperating with the first limiting portion; A coil spring, the coil spring comprising an outer end and an inner end, the outer end of the coil spring being connected to the fixing member; A follower is connected to the inner end of the coil spring. The follower is arranged on one side of the movable member and forms a rotational fit with the movable member. The follower includes a transition portion, which is arranged between the fixed member and the movable member. The transition portion is used to connect with the fixed member to maintain the deformation of the coil spring or to connect with the movable member to allow the coil spring to deform.

10. Photovoltaic tracking system, characterized in that, Comprising the power assist device as claimed in claim 9.

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