Power assisting assembly, power assisting device and photovoltaic tracking system

Abstract

The utility model relates to the technical field of power assisting machinery of a rotating shaft, in particular to a power assisting assembly, a power assisting device and a photovoltaic tracking device.The power assisting assembly comprises a driving part, the driving part is provided with a through hole used for being connected with an external load, and the peripheral face of the driving part is provided with an avoiding groove; the retainer is provided with a through hole coaxial with the through hole, the retainer is rotatably connected to the driving part in a manner that the through hole is coaxial with the through hole, and the retainer comprises a first frame body arranged at one end of the driving part and a second frame body connected with the first frame body and arranged at the other end of the driving part; the end, away from the driving piece, of the first frame body and the end, away from the driving piece, of the second frame body are each provided with a first hooking part used for being connected with the head end of the elastic piece. The switching part is hinged to the first frame body and the second frame body; a plurality of balls are further included. The power assisting assembly has the advantages that the axial size of the power assisting assembly is reduced, the stability of the retainer is improved, and the using efficiency and the assembling efficiency of the power assisting assembly are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of power-assisted mechanism of rotating shaft, and specifically relates to a power-assisted assembly, a power-assisted device and a photovoltaic tracking device. BACKGROUND

[0002] Shaft transmission technology is widely used, for example, a window is installed on a window frame through a rotating shaft, for example, a car gull wing door or trunk door is installed on a car body through a rotating shaft, for example, in a photovoltaic tracking system, a photovoltaic panel is connected with a fixed support through a rotating shaft, and for example, a bicycle wheel is connected with a frame.

[0003] In such applications, the rotating shaft is usually horizontally arranged or arranged non-perpendicularly to the ground; at this time, a load driven by the rotating shaft, such as a window, a door or a photovoltaic panel, is arranged offset, so that the center of gravity of the load driven by the rotating shaft cannot coincide with the central axis of the rotating shaft, and thus, in the rotating process, the center of gravity of the load driven by the rotating shaft also rotates around the rotating shaft, and thus, when the rotating shaft drives the load to move, the following two situations may occur: first, the center of gravity moves from a high position to a low position, at this time, the torque output by the power source (such as a motor) for driving the load to move through the rotating shaft is usually maintained to prevent the load from rotating freely, that is, to overcome the effect of gravity; second, the center of gravity moves from a low position to a high position, at this time, the torque output by the power source needs to overcome the effect of gravity and also needs to drive the load to move.

[0004] In the above two situations, when the center of gravity of the load and the central axis of the rotating shaft are located at the same horizontal position, the effect of gravity of the load is the largest.

[0005] Therefore, when selecting a power source for driving a load driven by a non-perpendicularly arranged rotating shaft to rotate around the shaft, the torque output by the power source needs to meet the condition that the center of gravity of the load is located at the same horizontal position as the central axis of the rotating shaft, and after the power source drives the load to move around the shaft, the power of the power source will be excessive, which leads to an increase in cost.

[0006] To solve this problem, in the Chinese patent application with the application number CN202420797690.7 previously proposed by the applicant, a power-assisted device for a rotating shaft and a photovoltaic tracking system are disclosed, wherein the conversion structure is in rotary cooperation with the movable piece, and in order to improve efficiency and reduce friction, a bearing needs to be arranged between the conversion structure and the movable piece, and thus the axial space of the power-assisted assembly needs to be reserved for the bearing, which leads to an increase in the axial size of the power-assisted assembly, and when multiple power-assisted assemblies are arranged coaxially, the problem of large axial size is more prominent. How to reduce the size of the power-assisted assembly is a problem that needs to be solved at present. CONTENT OF THE UTILITY MODEL

[0007] The first object of the utility model is to provide a kind of power-assisted component, to solve the problem of the large axial dimension of existing power-assisted component.The second object of the utility model is to provide a kind of power-assisted device.The third object of the utility model is to provide a kind of photovoltaic tracking device.

[0008] The utility model is realized by the following technical solutions:

[0009] As the first aspect of the utility model, a kind of power-assisted component, comprising:

[0010] Driving part, the driving part is equipped with the through hole for being connected with external load, the outer circumferential surface of the driving part is equipped with avoiding slot;

[0011] Retainer, the retainer is equipped with the through hole coaxial with the through hole, the retainer is rotatably connected to the driving part with the through hole coaxial with the through hole, and the retainer includes:

[0012] First frame body, be equipped in one end of the driving part,

[0013] Second frame body, connected with the first frame body, equipped in the other end of the driving part,

[0014] The first frame body is away from the one end of the driving part and the second frame body is away from the one end of the driving part, and the first frame body is equipped with the first hanging part for connecting the first end of elastic member;

[0015] Adapter, between the first frame body and the second frame body, articulated to the first frame body and second frame body, the adapter is equipped with the combination part for cooperating with the outer circumferential surface of the driving part;

[0016] Further comprising a plurality of ball bearings, and,

[0017] The both ends of the driving part are equipped with the first ring groove coaxial with the through hole, and / or, the one end of the first frame body close to the driving part and the one end of the second frame body close to the driving part are equipped with the second ring groove coaxial with the through hole,

[0018] The ball bearing array is arranged in the first ring groove and / or second ring groove.

[0019] Optionally, the power-assisted component further includes connecting seat, the connecting seat is from the one end of the first frame body away from the driving part, and / or, the connecting seat is from the one end of the second frame body away from the driving part, extend along the axial direction of the through hole and form away from the driving part direction;

[0020] The first hanging part is equipped in the connecting seat.

[0021] Optionally, the connecting seat is annular, and an inner annular surface of the annular connecting seat coincides with an inner wall surface of the through hole.

[0022] Optionally, an extension end of the connecting seat extends along a radial direction of the through hole to the axial direction of the through hole to form a first reinforcing part.

[0023] Optionally, the first hanging part is a reserved port provided on a cylinder wall of the connecting seat, or the first hanging part is a hanging groove provided on an outer peripheral surface of the connecting seat.

[0024] Optionally, the power-assisted assembly further comprises a second hanging part for presetting a tail end of the elastic member, the second hanging part is formed by extending, from one end of the first frame body away from the driving member and / or the connecting seat away from the driving member, along an axial direction of the through hole to a direction away from the driving member.

[0025] Optionally, an outer peripheral surface of the first frame body is folded along an axial direction of the through hole to a direction away from the driving member to form a second reinforcing part,

[0026] and / or,

[0027] an outer peripheral surface of the second frame body is folded along an axial direction of the through hole to a direction away from the driving member to form a third reinforcing part.

[0028] As a second aspect of the utility model, the power-assisted device comprises at least one power-assisted unit, and a plurality of power-assisted units are coaxially arranged;

[0029] Each power-assisted unit comprises two elastic members and a power-assisted assembly as described above, and one end of each elastic member is connected to the first hanging part of the first frame body and the first hanging part of the second frame body, respectively.

[0030] Further comprising a fixing member in the shape of a cylinder, which is sleeved on the power-assisted unit, the fixing member is provided with a retaining groove matched with the adapter part, and the fixing member is further provided with a connecting part for connecting the other end of the elastic member.

[0031] As a third aspect of the utility model, the power-assisted device is used in a photovoltaic tracking device.

[0032] The embodiment has the advantages of reducing the axial dimension of the power-assisted assembly, increasing the stability of the retaining frame, improving the use efficiency and assembly efficiency of the power-assisted assembly, and making the power-assisted device adaptable to different external loads.

[0033] First, the first annular groove arranged on the driving member and the second annular groove arranged on the retainer, and the plurality of balls are used to realize the rotation cooperation between the retainer and the driving member, the friction force of the retainer relative to the driving member is reduced, the working efficiency of the power-assisted assembly is improved, compared with the existing bearing, the driving member and the retainer are more compact, and the axial size of the power-assisted assembly is reduced.

[0034] Second, the first frame body and the second frame body are arranged at two ends of the driving member, and are in rotation cooperation with the driving member, when the driving member is matched with the adapter, the driving member drives the elastic member to deform through the retainer, under the action of the first frame body and the second frame body, the elastic members on both sides are deformed at the same time, the deflection of the retainer relative to the driving member caused by uneven stress is avoided, the friction force is increased, and the efficiency of the power-assisted assembly is further improved.

[0035] Third, the second reinforcing edge, the convex rib and the first reinforcing edge arranged on the first frame body and the second frame body can increase the strength of the retainer, avoid deformation of the retainer, and increase the stability of the retainer.

[0036] Fourth, when the power-assisted assembly is installed, the elastic member is arranged on the connecting seat, the first end of the elastic member is hung on the first hanging position, then the elastic member is pre-tightened, and after the pre-tightening is adapted to the external load, the tail end of the elastic member is pre-installed in the second hanging position, finally, when the power-assisted assembly is arranged in the fixing member, the tail end of the elastic member is connected to the fixing member, the whole assembling process of the power-assisted assembly is simple and fast, and the assembling efficiency of the power-assisted device is improved; at the same time, under the action of the second hanging part, the initial pre-tightening force of the elastic member is convenient to set, so that it is adapted to different external loads. BRIEF DESCRIPTION OF DRAWINGS

[0037] The following drawings describe the exemplary embodiments disclosed in the application in detail. Same reference numerals in several views of the drawings represent similar structures. Those skilled in the art will understand that these embodiments are non-limiting, exemplary embodiments, the drawings are only for the purpose of illustration and description, and are not intended to limit the scope of the application, and other embodiments can also achieve the application intent in the application. It should be understood that the drawings are not drawn to scale. Among them:

[0038] Figure 1 It is a schematic view of the power-assisted assembly in the embodiments of the application;

[0039] Figure 2 It is an exploded schematic view of Figure 1 ;

[0040] Figure 3 It is a schematic view of Figure 2Schematic view of the middle driving member;

[0041] Figure 4 For Figure 2 Schematic view of the first perspective of the first frame body;

[0042] Figure 5 For Figure 2 Schematic view of the second perspective of the first frame body;

[0043] Figure 6 Schematic view of the power-assisted device in the embodiment of the present application.

[0044] The respective marks in the figures are as follows:

[0045] 1, driving member; 11, through hole; 12, first annular groove; 13, avoiding groove;

[0046] 2, retainer; 21, first frame body; 211, first hanging part; 212, second annular groove; 213, connecting seat; 2131, first reinforcing edge; 214, second reinforcing edge; 215, second hanging part; 22, second frame body; 23, adapter; 24, connecting member; 25, through hole;

[0047] 3, elastic member;

[0048] 4, ball;

[0049] 5, fixing member; 51, retaining groove. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the scope of protection of the present application. It can be understood that some technical means of the various embodiments described herein can be replaced or combined with each other without conflict.

[0051] In the description of the present application, if there are terms such as “first”, “second”, etc., they are only used to distinguish the described objects, and do not have any order or technical meaning. Therefore, the objects defined with “first”, “second”, etc. can be explicitly or implicitly included one or more objects. And, “one” or “a” and the like do not represent a quantity limit, but represent the existence of at least one, and “multiple” represents no less than two.

[0052] In the description of the present application, if there are terms such as "connection", "abutment", "installation", "fixation", "contact", "support", "accommodation" and the like, they should be understood in a broad sense. For example, "connection" can be separate connection or integral connection; can be direct connection or indirect connection through an intermediate medium; can be non-detachable connection or detachable connection; can be mechanical connection or electrical connection; or can be internal communication of two elements or interaction relationship between two elements. For another example, "abutment" can be direct abutment or indirect abutment through an intermediate medium. For another example, "accommodation" does not necessarily mean complete accommodation of the whole, and the concept also includes partial accommodation with part protruding externally. For those skilled in the art, the specific meaning of the foregoing terms in the present application can be understood according to the specific circumstances.

[0053] In the description of the present application, if there are terms such as "A is connected to B in a rotatable manner" and the like, it means that A is connected to B directly or indirectly, and A can rotate relative to B.

[0054] In the description of the present application, reference to "one embodiment" or "some embodiments" and the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Therefore, the appearance of the phrases "in one embodiment", "in some embodiments", "in other some embodiments", "in yet some embodiments" and the like in different places in the specification does not necessarily all refer to the same embodiment, but means "one or more but not all embodiments", unless otherwise specifically emphasized.

[0055] A first aspect of the present embodiment is shown in Figures 1 to 5 A power-assisted assembly, comprising:

[0056] A driving member 1, which is provided with a through hole 11 for connecting with an external load, and an outer circumferential surface of the driving member 1 is provided with a relief groove 13;

[0057] A retainer 2, which is provided with a through hole 25 coaxial with the through hole 11, and the retainer 2 is rotationally connected to the driving member 1 in a manner that the through hole 25 is coaxial with the through hole 11, and the retainer 2 comprises:

[0058] A first frame body 21, which is arranged at one end of the driving member 1,

[0059] A second frame body 22, which is connected with the first frame body 21 and arranged at the other end of the driving member 1,

[0060] The first frame body 21 away from one end of the driving member 1 and the second frame body 22 away from one end of the driving member 1 are both provided with a first hanging part 211 for connecting a first end of an elastic member 3.

[0061] The adapter 23 is located between the first frame 21 and the second frame 22 and is hinged to the first frame 21 and the second frame 22, and the adapter 23 is provided with a combination part for cooperating with the outer circumferential surface of the driving part 1;

[0062] Further comprising a plurality of balls 4, and

[0063] The driving part 1 is provided with a first annular groove 12 coaxial with the through hole 11 at both ends, and / or the first frame 21 is provided with a second annular groove 212 coaxial with the through hole 11 near one end of the driving part 1, and the second frame 22 is provided with a second annular groove 212 coaxial with the through hole 11 near one end of the driving part 1,

[0064] The balls 4 are arranged in the first annular groove 12 and / or the second annular groove 212.

[0065] It should be noted that in the present example, the driving part 1 is used to connect with the external load, and forms a rotating cooperation with the retainer 2, and under the cooperation of the adapter 23, the driving part 1 rotates synchronously with the retainer 2, and under the premise of meeting the action of the driving part 1, the driving part 1 is provided with a through hole 11, and the inner wall surface of the through hole 11 is provided with a spline or a key groove connected with an external shaft; and the outer circumferential surface of the driving part 1 is further provided with an avoiding groove 13, when the adapter 23 cooperates with the avoiding groove 13, the adapter 23 rotates synchronously with the retainer 2.

[0066] It should be noted that in the present example, the adapter 23 is used to connect the retainer 2 and the driving part 1, so that the external load can drive the elastic part 3 connected to the retainer 2 to deform through the driving part 1; and under the premise of meeting the action of the adapter 23, the adapter 23 in the present embodiment is located between the first frame 21 and the second frame 22 and is hinged to the first frame 21 and the second frame 22, and the adapter 23 is provided with a combination part for embedding in the avoiding groove 13 of the driving part 1, under external pressure, the combination part of the adapter 23 is embedded in the retaining groove 51 on the driving part 1, so as to realize the synchronous rotation of the driving part 1 and the retainer 2.

[0067] It should be noted that the elastic part 3 mentioned in the present embodiment refers to a component that can deform under external force and can restore to the state before the external force disappears after the external force disappears; therefore, a coil spring, a torsion spring, a tension spring or other components made of materials such as rubber with elasticity that can meet the requirements of the elastic part 3 proposed in the present application can be used as the elastic part 3 of the present embodiment, or a combination of coil springs, torsion springs, tension springs or other components with elasticity.

[0068] It should be noted that in the present example, in order to connect the first frame body 21 and the second frame body 22 arranged on both sides of the driving member 1, at least one connecting member 24 is arranged between the first frame body 21 and the second frame body 22, one end of the connecting member 24 is connected with the first frame body 21, and the other end of the connecting member 24 is connected with the second frame body 22. The connecting member 24 not only keeps the first frame body 21 and the second frame body 22 in a connected state, but also supports the first frame body 21 and the second frame body 22, thereby avoiding affecting the rotation cooperation between the first frame body 21 and the driving member 1 and between the second frame body 22 and the driving member 1, and avoiding deformation of the first frame body 21 and the second frame body 22.

[0069] Further, in the present embodiment, the connection mode between the connecting member 24 and the first frame body 21 or the second frame body 22 is as follows:

[0070] Fixed connection, for example: both ends of the connecting member 24 are welded with the first frame body 21 and the second frame body 22 respectively.

[0071] Detachable connection, including but not limited to riveting, buckle connection or flange connection and the like.

[0072] As preferred, as shown in Figures 2 to 5 , in order to increase the stability of the connection of the first frame body 21 and the second frame body 22, the number of the connecting member 24 is three, the three connecting members 24 are distributed on the outer periphery of the second ring groove 212, the spacing of the first frame body 21 and the second frame body 22 at each position is kept consistent, and a triangle is formed between the three connecting members 24, so that the connection of the first frame body 21 and the second frame body 22 is more stable.

[0073] It should be noted that the first frame body 21 and the second frame body 22 in the present embodiment are symmetrically arranged at both ends of the driving member 1, in order to save space, in the present embodiment, only the structure of the first frame body 21 is described, and in fact, in order to facilitate processing, the structures of the first frame body 21 and the second frame body 22 are basically the same, and are symmetrically arranged, or are completely the same.

[0074] It should be noted that in the present embodiment, in order to more conveniently arrange the elastic member 3 and also to avoid interference of the elastic member 3 with the shaft arranged in the through hole 11 and the through hole 25 during deformation, as shown in Figure 2 , Figure 4 and Figure 5 , a connecting seat 213 is arranged, the connecting seat 213 extends from one end of the first frame body 21 away from the driving member 1 and / or from one end of the second frame body 22 away from the driving member 1 along the axial direction of the through hole 25 to the direction away from the driving member 1, and the first hanging portion 211 is arranged on the connecting seat 213.

[0075] Further, in the embodiment, the connecting seat 213 extends along the axial direction of the through hole 25 away from the driving part 1, and the extending end can be in the same plane or not. The connecting seat 213 is used for arranging the elastic part 3, and the extending length can be greater than or equal to the width of the elastic part 3 for the convenience of arranging the elastic part 3. Alternatively, the extending length can be less than the width of the elastic part 3 for reducing the self weight.

[0076] Further, in the embodiment, when the extending length of the connecting seat 213 is less than the width of the elastic part 3, the extending length of the connecting seat 213 at the position for arranging the first hanging part 211 is greater than the width of the elastic part 3 for the convenience of hanging the head end of the elastic part 3.

[0077] Further, in the embodiment, the connecting seat 213 is annular, and the inner annular surface of the connecting seat 213 coincides with the inner wall surface of the through hole 25 under the premise of meeting the function of the connecting seat 213.

[0078] As shown in Figure 4 and Figure 5 , when the connecting seat 213 is annular, the extending end of the connecting seat 213 extends along the radial direction of the through hole 25 to the axial direction of the through hole 25 to form the first reinforcing part.

[0079] Further, in the embodiment, as shown in Figure 4 and Figure 5 , the first hanging part 211 is a reserved port arranged on the cylinder wall of the connecting seat 213, or the first hanging part 211 is a hanging groove arranged on the outer circumferential surface of the connecting seat 213.

[0080] It should be noted that, in the embodiment, as shown in Figures 2 to 5 , in order to adapt to different loads, the elastic part 3 needs to have different pre-tightening forces, as shown in Figure 4 and Figure 5 , a second hanging part 215 can be arranged, which is used for presetting the tail end of the elastic part 3. The second hanging part 215 extends along the axial direction of the through hole 25 away from the driving part 1 from the end of the first frame body 21 away from the driving part 1 and / or from the end of the connecting seat 213 away from the driving part 1.

[0081] It should be noted that the second hanging part 215 for presetting the tail end of the elastic part 3 means that the tail end of the elastic part 3 is pre-tightened, the pre-tightened tail end of the elastic part 3 is hung in the second hanging part, and finally the power-assisted assembly is assembled, and the other end of the hung elastic part 3 is connected to the external fixed structure.

[0082] It should be noted that, in this embodiment, in order to avoid the deformation and folding of the first frame body 21, the strength of the first frame body 21 needs to be increased, which can be achieved in at least one of the following ways:

[0083] First, the outer periphery of the first frame body 21 is folded away from one end of the driving member 1 along the axial direction of the through hole 25 to form a second reinforcing part,

[0084] and / or,

[0085] the outer periphery of the second frame body 22 is folded away from one end of the driving member 1 along the axial direction of the through hole 25 to form a third reinforcing part.

[0086] Second, one end of the first frame body 21 protrudes to the other end to form a first protruding rib,

[0087] and / or,

[0088] one end of the second frame body 22 protrudes to the other end to form a second protruding rib.

[0089] As a second aspect of the present embodiment, as shown in Figure 6 the power assisting device comprises at least one set of power assisting units, and a plurality of sets of power assisting units are coaxially arranged;

[0090] Each set of power assisting units comprises two elastic members 3 and a power assisting assembly as described above, and one end of each of the two elastic members 3 is connected to the first hanging part 211 of the first frame body 21 and the first hanging part 211 of the second frame body 22, respectively.

[0091] It further comprises a fixing member 5 in the shape of a cylinder, which is sleeved on the power assisting unit, and the fixing member 5 is provided with a retaining groove 51 matched with the adapter 23, and the fixing member 5 is further provided with a connecting part for connecting the other end of the elastic member 3.

[0092] As a third aspect of the present embodiment, a photovoltaic tracking device comprises the power assisting device as described above.

[0093] The advantages of the present embodiment are: reducing the axial size of the power assisting assembly, increasing the stability of the retainer 2, improving the use efficiency and assembly efficiency of the power assisting assembly, and making the power assisting device adapt to different external loads.

[0094] First, the first ring groove 12 provided on the driving member 1 and the second ring groove 212 provided on the retainer 2, and a plurality of balls 4 are used to realize the rotational cooperation between the retainer 2 and the driving member 1, which reduces the friction between the retainer 2 and the driving member 1 during rotation, improves the working efficiency of the power assisting assembly, and compared with the use of existing bearings, not only reduces the cost, but also makes the driving member 1 and the retainer 2 more compact, and reduces the axial size of the power assisting assembly.

[0095] Secondly, the first frame body 21 and the second frame body 22 are arranged at two ends of the driving member 1 and are in rotation cooperation with the driving member 1. When the driving member 1 is in cooperation with the adapter 23, the driving member 1 drives the elastic member 3 to deform through the retainer 2. Under the action of the first frame body 21 and the second frame body 22, the elastic member 3 on both sides deforms at the same time, which avoids the deflection of the retainer 2 relative to the driving member 1 caused by uneven stress, and the increase of friction force, and further improves the efficiency of the power-assisted assembly.

[0096] Thirdly, the second reinforcing edge 214, the convex rib and the first reinforcing edge 2131 arranged on the first frame body 21 and the second frame body 22 can increase the strength of the retainer 2, avoid the deformation of the retainer 2, and increase the stability of the retainer 2.

[0097] Fourthly, when the elastic member 3 is installed in the power-assisted assembly, the elastic member 3 is arranged on the connecting seat 213 first, the head end of the elastic member 3 is hung on the first hanging position, then the elastic member 3 is pre-tightened, and after the pre-tightening is adapted to the external load, the tail end of the elastic member 3 is preset on the second hanging position. Finally, when the power-assisted assembly is arranged in the fixing member 5, the tail end of the elastic member 3 is connected to the fixing member 5. The assembly process of the power-assisted assembly is simple and fast, and the assembly efficiency of the power-assisted device is improved. At the same time, under the action of the second hanging portion 215, the initial pre-tightening force of the elastic member 3 is convenient to set, which is adapted to different external loads.

Claims

1. A power assist assembly, characterized by, include: An active member, wherein the active member is provided with a through hole for connecting to an external load, and an outer peripheral surface of the active member is provided with an avoidance groove; A retainer, wherein the retainer is provided with a through hole coaxial with the through hole, and the retainer is rotatably connected to the active member in a manner that the through hole is coaxial with the through hole, and the retainer comprises: The first frame is provided at one end of the active member. The second frame is connected to the first frame and is provided at the other end of the active component. The end of the first frame away from the active member and the end of the second frame away from the active member are both provided with a first hanging portion for connecting to the head end of the elastic member; a transition portion, located between the first frame and the second frame, hinged to the first frame and the second frame, wherein the transition portion is provided with a coupling portion for cooperating with the outer peripheral surface of the active member; Also includes a number of balls, and, Both ends of the active member are provided with a first annular groove coaxial with the through hole, and / or one end of the first frame body close to the active member and one end of the second frame body close to the active member are provided with a second annular groove coaxial with the through hole, The ball array is arranged in the first annular groove and / or the second annular groove.

2. The assist assembly of claim 1, wherein, The retaining frame further includes a connecting piece, and the first frame body and the second frame body are connected through the connecting piece.

3. The assist assembly of claim 1, wherein, The device further includes a connecting seat, the connecting seat starting from an end of the first frame away from the active member, and / or the connecting seat starting from an end of the second frame away from the active member, and extending along the axial direction of the through hole in a direction away from the active member; The first hanging portion is arranged on the connecting seat.

4. The assist assembly of claim 3, wherein, The connecting seat is annular, and the inner annular surface of the annular connecting seat coincides with the inner wall surface of the through hole.

5. The assist assembly of claim 4, wherein, The extending end of the connecting seat extends along the radial direction of the through hole toward the axial direction of the through hole to form a first reinforcement portion.

6. An assist assembly according to any one of claims 3 to 5, wherein, The first hanging portion is a reserved opening provided on the wall of the connecting seat, or the first hanging portion is a hanging groove provided on the outer peripheral surface of the connecting seat.

7. The assist assembly of claim 6, wherein, It also includes a second hanging portion, which is used to pre-set the tail end of the elastic member. The second hanging portion starts from the end of the first frame away from the active member, and / or the connecting seat starts from the end of the second frame away from the active member and extends along the axial direction of the through hole in a direction away from the active member.

8. An assist assembly according to any one of claims 1-5, characterized in that The outer periphery of the first frame is folded along the axial direction of the through hole toward one end away from the active member to form a second reinforcement portion. and / or, The outer periphery of the second frame is folded along the axial direction of the through hole toward an end away from the active component to form a third reinforcement portion.

9. An assisting device, characterized in that It includes at least one group of power-assisting units, and multiple groups of power-assisting units are coaxially arranged; Each group of the power-assisting units includes two elastic members and the power-assisting assembly according to any one of claims 1 to 8, one end of the two elastic members being connected to the first hanging portion of the first frame and the first hanging portion of the second frame respectively; It also includes a fixing piece, which is cylindrical and sleeved on the power-assisting unit. The fixing piece is provided with a retaining groove that cooperates with the adapter part. The fixing piece is also provided with a connection point for connecting the other end of the elastic piece.

10. A photovoltaic tracking device, characterized by, Comprising the power assist device as claimed in claim 9.

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