An adjustable center distance structure

Abstract

The utility model discloses a kind of adjustable center distance structures, it is related to electric tool field, including first component and second component, multiple different first connecting units are equipped on first component, second component is equipped with one second connecting unit, any one first connecting unit can be matched, first connecting unit includes two first connectors, which are arranged on first component and spaced along the vertical direction of the central axis of first component, second connecting unit includes two second connectors, which are arranged on second component and spaced along the vertical direction of the central axis of second component, first connector can be matched with second connector. The center distance between the two components of the present application can be adjusted in a specific direction, which not only helps to balance the centrifugal force and the centrifugal torque, effectively suppresses its adverse effects, but also enables flexible regulation and control of output performance. Without the need to replace components, it can adapt to different output requirements, effectively avoiding the trouble brought by diversified processing.

Description

Technical Field

[0001] This utility model relates to the field of power tools, specifically to an adjustable center distance structure. Background Technology

[0002] Center distance refers to the straight-line distance between the geometric centers, axes of rotation, or centers of symmetry of two components. It is an important geometric parameter used to describe the positional relationship between components. In statics and dynamics, center distance can be used to calculate moment of inertia, angular momentum, and kinetic energy, thus helping us better understand the laws of motion and interactions of objects. Furthermore, center distance can also be applied in engineering to design the balance and stability of mechanical structures and systems.

[0003] Centrifugal force and centrifugal torque are inevitably generated during component rotation, and these forces and torques are often closely related to the center distance. By adjusting the relative positions of the rotating components, the center distance can effectively suppress additional vibrations caused by assembly errors, misalignment, looseness, etc., thereby indirectly reducing the negative impact of centrifugal force and torque, and significantly improving the overall dynamic balance.

[0004] In existing technologies, center distance adjustment is usually free-direction adjustment, that is, adjustment without a specific direction. Although this adjustment method brings flexibility to assembly, it lacks control over the adjustment direction. For asymmetric structures with dynamic balance requirements, such as asymmetric fans in round sand, this non-directional adjustment is difficult to effectively optimize mass distribution, which will cause significant vibration due to the generation of centrifugal force and centrifugal torque. If center distance adjustment along a specific direction can be achieved, the mass distribution can be actively adjusted, the influence of centrifugal force and centrifugal torque can be effectively suppressed, and the vibration characteristics can be significantly improved.

[0005] Currently, to obtain different center distances, it is often necessary to perform diversified processing on the components, that is, the processing of each component is different. This method of obtaining center distance not only leads to complex processing technology and high manufacturing costs, but also makes the components lack interchangeability and adjustment flexibility, making it difficult to adapt to different working conditions. Utility Model Content

[0006] Purpose of this utility model: The purpose of this utility model is to provide an adjustable center distance structure, which solves the problems caused by the free direction adjustment of the center distance and the difficulty in obtaining the center distance through diversified processing. The center distance between the two components of this application can be adjusted along a specific direction, which not only helps to balance centrifugal force and centrifugal torque and effectively suppress their adverse effects, but also enables flexible control of output performance. It can adapt to different output requirements without replacing components, effectively avoiding the troubles caused by diversified processing.

[0007] Technical solution: An adjustable center distance structure, including a first component and a second component, wherein the first component is provided with a plurality of different first connecting units, and the second component is provided with a second connecting unit that can cooperate with any one of the first connecting units; The first component can cooperate with the second connection unit based on multiple different first connection units, which can change the center distance between the first component and the second component.

[0008] Furthermore: Each of the first connecting units includes two first connecting members disposed on the first component and spaced apart in a direction perpendicular to the central axis of the first component; The second connecting unit includes two second connecting members disposed on the second component and spaced apart in a direction perpendicular to the central axis of the second component; In this embodiment, any two first connectors on the first connecting unit can cooperate with the two second connectors on the second connecting unit; The first component can be based on any two first connectors on the first connecting unit and can cooperate with two second connectors on the second connecting unit, so that the center distance between it and the second component can be changed along the direction of the center line connecting the first component and the second component.

[0009] Furthermore: the total span of the first connecting unit along the direction perpendicular to the central axis of the first component is equal; The maximum distance between the first connecting unit and the central axis of the first component along the vertical direction of the central axis of the first component is not equal; The maximum distance between the two first connectors in the first connecting unit along the vertical direction of the central axis of the first component is the total span of the first connecting unit along the vertical direction of the central axis of the first component.

[0010] Furthermore: the second connector has a connecting groove on one side of the corresponding side along the vertical direction of the central axis of the second component; The second connector mates with the first connector based on the connecting groove; The first component can be matched with the two first connectors on any one of the first connecting units and the two connecting slots on the second connecting unit, so that the center distance between the first component and the second component can be changed along the direction of the center line connecting the first component and the second component.

[0011] Furthermore: a hole is made at the center of the second component, and the central axis of the hole coincides with the central axis of the second component; The second connector is disposed on the inner wall of the hole and is arranged at intervals along the central axis of the hole. One end of the first component can be inserted into the hole, and the first connecting unit is disposed on the outer end wall of the insertion end of the first component.

[0012] Further: The hole is a circular hole, and the second connector is disposed on the inner wall of the circular hole and is arranged at intervals along the diameter direction of the circular hole. The second connector has a connecting groove on the corresponding side along the diameter direction of the circular hole. The first component insertion end has a circular cross-section, and the first connectors in the first connecting unit are arranged at intervals along the radial direction of the first component insertion end on the outer end wall of the first component insertion end.

[0013] Furthermore: the total span of the first connecting unit along the radial direction of the insertion end of the first component is equal; The maximum distance between the two first connectors in the first connecting unit along the radial direction of the insertion end of the first component is the total span of the first connecting unit along the radial direction of the insertion end of the first component.

[0014] Furthermore, the maximum distance between the first connecting unit and the center of the cross-section of the first component insertion end along the radial direction of the first component insertion end is not equal.

[0015] Furthermore, all the first connecting members are arranged perpendicular to the central axis of the first component.

[0016] Further: The first connecting units are arranged at circumferential intervals.

[0017] The beneficial effects of this utility model are: 1. This application can match multiple different first connection units with a second connection unit, thereby changing the center distance between the two components. Different output effects can be obtained without replacing the components, effectively avoiding the troubles caused by diversified processing.

[0018] 2. This application designs the first connecting unit and the second connecting unit such that the first connecting members in the first connecting unit are arranged at intervals along the vertical direction of the central axis of the first component, and the second connecting members in the second connecting unit are arranged at intervals along the vertical direction of the central axis of the second component. The total span of the first connecting unit along the vertical direction of the central axis of the first component is equal, and the maximum distance between the first connecting unit and the central axis of the first component along the vertical direction of the central axis of the first component is unequal. This design allows the center distance between the first component and the second component of this application to be changed along the direction of the line connecting the centers of the two components.

[0019] 3. The center distance between the two components of this application can be adjusted along the line connecting the centers of the two components. This specific directional adjustment not only helps to balance centrifugal force and centrifugal torque and effectively suppress their adverse effects, but also enables flexible control of output performance. It can adapt to different output requirements without replacing components, effectively avoiding the troubles caused by diversified processing and having good adaptability to working conditions. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an adjustable center distance structure according to this application.

[0021] Figure 2 This is a simplified diagram of the main frame of an existing sander.

[0022] Figure 3 This is a partial cross-sectional view of an adjustable center distance structure applied to an existing sander according to this application.

[0023] Figure 4 This is a schematic diagram showing the location of the card slot.

[0024] Figure 5 This is a schematic diagram showing the location of the rib.

[0025] In the diagram: 1. First component; 2. Second component; 3. First connector; 4. Second connector; 5. Connecting groove; 6. Hole; 7. Chassis; 8. Fan; 9. Motor; 10. First through hole; 11. Protrusion; 12. Motor rotor; 13. Rib; 14. Snap-fit ​​component; 15. Snap-fit ​​groove; 16. Bearing; 17. Second through hole. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0027] Those skilled in the art will understand that, without conflict, the features in the following embodiments and implementations can be combined with each other.

[0028] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear," which indicate orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0029] As used herein, the singular forms “a,” “an,” and “the” include plural objects, and the plural form “multiple” includes two or more objects, unless otherwise expressly indicated. As used herein, the term “or” is generally used to include the meaning of “and / or,” unless otherwise expressly indicated, and the terms “install,” “connect,” and “link” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Connections can be direct or indirect through an intermediate medium, and can be internal communication between two components or an interaction between two components.

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments: like Figure 1 As shown, an adjustable center distance structure includes a first component 1 and a second component 2. The first component 1 has multiple first connecting units, each of which is different. The second component 2 has a second connecting unit, and any one of the first connecting units can cooperate with the second connecting unit. In this application, the first component 1, based on the fact that multiple different first connecting units can cooperate with the second connecting unit, allows the center distance between the first component 1 and the second component 2 to be changed. This enables different output effects to be obtained without changing the components, meeting different output requirements and effectively avoiding the trouble caused by diverse component processing to obtain different center distances.

[0031] This application's first connecting unit includes two first connecting members 3 disposed on the first component 1 and spaced apart perpendicularly to the central axis of the first component 1. The second connecting unit includes two second connecting members 4 disposed on the second component 2 and spaced apart perpendicularly to the central axis of the second component 2. The two first connecting members 3 on any one of the first connecting units can cooperate with the two second connecting members 4 on the second connecting unit. Based on the fact that the two first connecting members 3 on any one of the first connecting units can cooperate with the two second connecting members 4 on the second connecting unit, this application allows the center distance between the first component 1 and the second component 2 to change along the line connecting their centers.

[0032] The central axis is a virtual straight line used to represent the symmetry, main extension direction or rotation center of an object. To facilitate the determination of the central axis of the first component 1 and the second component 2 of this application, the first component 1 and the second component 2 of this application can preferably be set as regular shapes such as circular shaft, disk, or rectangle.

[0033] Each first connecting unit in this application has two first connecting pieces 3, but each first connecting unit is different. Specifically, the total span of the first connecting unit in the direction perpendicular to the central axis of the first component 1 is equal, and the maximum distance between the first connecting unit in the direction perpendicular to the central axis of the first component 1 and the central axis of the first component 1 is unequal. The maximum distance between the two first connecting pieces 3 in the first connecting unit in the direction perpendicular to the central axis of the first component 1 is the total span of the first connecting unit in the direction perpendicular to the central axis of the first component 1.

[0034] The maximum distance between the first connecting unit and the central axis of the first component 1 in the vertical direction along the first connecting unit of this application is not equal. Specifically, each first connecting unit has two first connecting parts 3, and the maximum distance between the two first connecting parts 3 and the central axis of the first component 1 in the vertical direction along the first connecting part 1 will also have two values, of which the larger value is the maximum distance between the first connecting unit and the central axis of the first component 1 in the vertical direction along the first connecting part 1. In this application, the maximum distance between the two first connecting pieces 3 in the same first connecting unit and the central axis of the first component 1 along the vertical direction can preferably be unequal, but they can also be equal. For example, if the total span of the first connecting unit along the vertical direction of the central axis of the first component 1 is 2D, and the total span of the first connecting unit consists of D-1 and D+1, then D+1 should be selected as the maximum distance between the first connecting piece 3 and the central axis of the first component 1 along the vertical direction. If the total span of the first connecting unit consists of D and D, then D should be selected as the maximum distance between the first connecting piece 3 and the central axis of the first component 1 along the vertical direction. Here, D-1, D+1, and D all refer to the maximum distance between the first connecting piece 3 and the central axis of the first component 1 along the vertical direction. This design allows the center distance between the first component 1 and the second component 2 to be changed, while also achieving alignment of the central axes.

[0035] The second connector 4 of this application has a connecting groove 5 on one side of the corresponding side in the vertical direction of the central axis of the second component 2. The second connector 4 cooperates with the first connector 3 based on the connecting groove 5, that is, the first connector 3 can be inserted into the connecting groove 5. The first component 1 and the second component 2 of this application can be connected by the first connector 3 being inserted into the connecting groove 5. The second component 2 of this application has a hole 6 at its center, and the central axis of the hole 6 coincides with the central axis of the second component 2. The second connector 4 is provided on the inner wall of the hole 6 and is arranged at intervals in the vertical direction of the central axis of the hole 6. One end of the first component 1 of this application can be inserted into the hole 6, and the first connecting unit can also be provided on the outer end wall of the insertion end of the first component 1. The two first connectors 3 on any one of the first connecting units of this application can cooperate with the two connecting grooves 5 in the second connecting unit, so that the center distance between the first component 1 and the second component 2 can be changed along the direction of the center line connecting the first component 1 and the second component 2.

[0036] In this application, the two first connectors 3 on any first connecting unit can cooperate with the two second connectors 4 or the two connecting slots 5 in the second connecting unit. Specifically, each first connecting unit is different, but the two first connectors 3 on each first connecting unit can cooperate with the two second connectors 4 or the two connecting slots 5 in the second connecting unit.

[0037] The hole 6 on the second component 2 of this application is a circular hole, and the corresponding cross-section of the insertion end of the first component 1 is also circular, which can also be regarded as the insertion end of the first component 1 being a circular shaft design. The second connector 4 is provided on the inner wall of the circular hole and is arranged at intervals along the diameter direction of the circular hole. The second connector 4 has a connecting groove 5 on the corresponding side along the diameter direction of the circular hole. The first connectors 3 in the first connecting unit are arranged at intervals along the radial direction of the insertion end of the first component 1 on the outer end wall of the insertion end of the first component 1. The total span of the first connecting unit along the radial direction of the insertion end of the first component 1 is equal. The maximum distance between the first connecting unit and the center of the cross-section of the insertion end of the first component 1 along the radial direction of the first connecting unit is unequal. The maximum distance between the two first connectors 3 in the first connecting unit along the radial direction of the insertion end of the first component 1 is the total span of the first connecting unit along the radial direction of the insertion end of the first component 1. The statement in this application that "the maximum distance between the first connecting unit and the center of the cross-section of the first component 1 along the radial direction of the insertion end of the first component 1 is not equal" can be referred to the above statement that "the maximum distance between the first connecting unit and the center axis of the first component 1 along the perpendicular direction of the central axis of the first component 1 is not equal". Details will not be repeated here. The distances mentioned in this application refer to straight-line distances.

[0038] The first connector 3 of this application can be arranged vertically along the central axis of the first component 1. For example, when one end of the first component 1 is inserted into the circular hole and its insertion end cross-section is designed to be circular, the first connector 3 can be arranged on the outer end wall of the insertion end of the first component 1 and arranged radially along the insertion end of the first component 1.

[0039] The first connecting unit of this application is preferably arranged circumferentially. For example, when one end of the first component 1 is inserted into the circular hole and its insertion end cross-section is designed to be circular, the first connecting unit can be arranged circumferentially on the outer end wall of the insertion end of the first component 1, that is, the first connecting member 3 is arranged circumferentially on the outer end wall of the insertion end of the first component 1.

[0040] The first connecting unit of this application can also be arranged axially at intervals. For example, when the insertion end of the first component 1 is designed as a round shaft, the first connecting member 3 can be arranged at intervals along the axial direction of the insertion end of the first component 1 on the outer end wall of the insertion end of the first component 1.

[0041] The rotation of components generates centrifugal force and centrifugal torque. If these cannot be balanced, vibration will occur. To control vibration, this application controls the direction of the centrifugal force to a straight line, that is, the direction of the line connecting the centers of the two components. This makes it much easier to balance the centrifugal force and the torque it generates, thus effectively suppressing the effects of centrifugal force and centrifugal torque.

[0042] The adjustable center distance structure of this application can be widely used in fields such as power tools. The following example uses a sander: Figure 2-5 The application of this application is illustrated in detail below: Existing sanders generally include a chassis 7, a fan 8 located directly above the chassis 7, and a motor 9 located directly above the fan 8. The fan 8 has a vertically opening circular first through hole 10 at its center, and a cylindrical protrusion 11 at the lower end of the fan 8. It can also be considered as a design where the protrusion 11 and the fan 8 are integrally formed. A vertically opening circular second through hole 17 is provided on the protrusion 11. The upper end of the chassis 7 is provided with a bearing seat, and a bearing 16 is provided inside the bearing seat. The bearing 16 is fitted onto the protrusion 11. The motor rotor 12 can vertically pass through the first through hole 10 and be inserted into the second through hole 17. Since the existing sander technology is already very mature, the details here will not be elaborated.

[0043] The motor rotor 12 can be considered as the first component 1 of this application, and the fan 8 can be considered as the second component 2 of this application. Multiple fasteners are formed on the outer end wall of the motor rotor 12. Each fastener includes two ribs 13 spaced apart along the radial direction of the motor rotor 12 on the outer end wall of the motor rotor 12. Each fastener is different, and these multiple different fasteners can be considered as multiple different first connecting units of this application. The ribs 13 can be considered as first connecting members 3 of this application. The total span of each fastener along the radial direction of the motor rotor 12 is equal, and the maximum distance between the two ribs 13 in the fastener along the radial direction of the motor rotor 12 is the total span of the fastener along the radial direction of the motor rotor 12. The maximum distance between each clamp and the central axis of the motor rotor 12 along the radial direction of the motor rotor 12 is not equal. Each clamp has two ribs 13, and the maximum distance between these two ribs 13 and the central axis of the motor rotor 12 along the radial direction of the motor rotor 12 also has two values. If the two values ​​are not equal, the larger value is selected as the maximum distance between the clamp and the central axis of the motor rotor 12 along the radial direction of the motor rotor 12; if the two values ​​are equal, one of the values ​​is selected as the maximum distance between the clamp and the central axis of the motor rotor 12 along the radial direction of the motor rotor 12.

[0044] A pair of snap-fit ​​pieces 14 are spaced apart along the diameter direction on the inner wall of the first through hole 10 of the fan 8. Each snap-fit ​​piece 14 has a snap-fit ​​groove 15 on its corresponding side along the diameter direction. The pair of snap-fit ​​pieces 14 can be regarded as the second connecting unit in this application, and a single snap-fit ​​piece 14 can be regarded as the second connecting piece 4 in this application. The snap-fit ​​groove 15 can be regarded as the connecting groove 5 in this application. The motor rotor 12 can be vertically inserted through the first through hole 10 and inserted into the second through hole 17. The ribs 13 on it will also be inserted into the snap-fit ​​groove 15. Each snap-fit ​​piece is different. By selecting different snap-fit ​​pieces to cooperate with the snap-fit ​​pieces 14, the center distance between the motor rotor 12 and the fan 8 can be changed along the direction of the line connecting their centers.

[0045] The number of clips on the motor rotor 12 can be set to four. The total span of each clip along the radial direction of the motor rotor 12 can be set to 2L. Specifically, the maximum distance between the two ribs 13 of the first clip and the central axis of the motor rotor 12 along the radial direction can be set to La and L+a, respectively; the maximum distance between the two ribs 13 of the second clip and the central axis of the motor rotor 12 along the radial direction can be set to Lb and L+b, respectively; the maximum distance between the two ribs 13 of the third clip and the central axis of the motor rotor 12 along the radial direction can be set to Lc and L+c, respectively; and the maximum distance between the two ribs 13 of the fourth clip and the central axis of the motor rotor 12 along the radial direction can be set to L and L, respectively. In this way, by selecting different clips to cooperate with the locking slot 15, the center distance between the motor rotor 12 and the fan 8 can be changed along the direction of the line connecting their centers. That is, the center distance between the two can be -a, +a, -b, +b, -c, +c, and 0. When the center distance between the two is 0, it means that their central axes are aligned.

[0046] The rotation of the sander chassis 7 includes revolution and rotation. The revolution axis is the rotor axis, and the rotation axis is the bearing axis. The bearing 16 and the cam 11 are designed to be coaxial. Adjusting the center distance between the motor rotor 12 and the fan 8 is equivalent to adjusting the center distance between the revolution axis and the rotation axis of the chassis 7.

[0047] The rotation of components generates centrifugal force and centrifugal torque. If these cannot be balanced, vibration will occur. To control the vibration, the center distance between the motor rotor 12 and the fan 8 is changed along the line connecting their centers. This adjusts the center distance between the revolution axis and the rotation axis of the chassis 7 in a specific direction, making it much easier to balance the centrifugal force and the torque it generates. This effectively suppresses the effects of centrifugal force and centrifugal torque.

[0048] Although the mechanical balancing of the sander is calculated during the overall machine design, in the actual manufacturing process, due to differences in raw material density or molding environment, there are significant differences between different batches of parts, resulting in a discrepancy between the actual product and the theoretical value, which in turn causes obvious vibration. At this time, the adjustable center distance structure of this application is applied to the sander. By cooperating with different clamps and clamping slots 15, the vibration effect of the sander can be changed. The optimal vibration scheme can be selected according to the design requirements.

[0049] To improve vibration in existing sanders, a balancing machine is typically used to correct the balance for each machine, which is very costly. However, by applying the adjustable center distance structure of this application to sanders, the imbalance can be controlled along a straight line, such as centrifugal force. Adjustments can then be made only in this straight line to achieve vibration reduction, significantly saving costs. Furthermore, applying the adjustable center distance structure of this application to sanders can effectively avoid the problems associated with obtaining different center distances for diverse component processing.

[0050] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the above specific embodiments. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. An adjustable center distance structure, characterized in that, It includes a first component and a second component. The first component is provided with a plurality of different first connection units, and the second component is provided with a second connection unit that can cooperate with any one of the first connection units. The first component can cooperate with the second connection unit based on multiple different first connection units, which can change the center distance between the first component and the second component.

2. The adjustable center distance structure according to claim 1, characterized in that, Each of the first connecting units includes two first connecting members disposed on the first component and spaced apart in a direction perpendicular to the central axis of the first component; The second connecting unit includes two second connecting members disposed on the second component and spaced apart in a direction perpendicular to the central axis of the second component; In this embodiment, any two first connectors on the first connecting unit can cooperate with the two second connectors on the second connecting unit; The first component can be based on any two first connectors on the first connecting unit and can cooperate with two second connectors on the second connecting unit, so that the center distance between it and the second component can be changed along the direction of the center line connecting the first component and the second component.

3. The adjustable center distance structure according to claim 2, characterized in that, The total span of the first connecting unit is equal along the direction perpendicular to the central axis of the first component. The maximum distance between the first connecting unit and the central axis of the first component along the vertical direction of the central axis of the first component is not equal; The maximum distance between the two first connectors in the first connecting unit along the vertical direction of the central axis of the first component is the total span of the first connecting unit along the vertical direction of the central axis of the first component.

4. The adjustable center distance structure according to claim 3, characterized in that, The second connector has a connecting groove on one side of the corresponding side along the vertical direction of the central axis of the second component; The second connector mates with the first connector based on the connecting groove; The first component can be matched with the two first connectors on any one of the first connecting units and the two connecting slots on the second connecting unit, so that the center distance between the first component and the second component can be changed along the direction of the center line connecting the first component and the second component.

5. The adjustable center distance structure according to claim 4, characterized in that, A hole is made at the center of the second component, and the central axis of the hole coincides with the central axis of the second component; The second connector is disposed on the inner wall of the hole and is arranged at intervals along the central axis of the hole. One end of the first component can be inserted into the hole, and the first connecting unit is disposed on the outer end wall of the insertion end of the first component.

6. The adjustable center distance structure according to claim 5, characterized in that, The hole is a circular hole, and the second connector is disposed on the inner wall of the circular hole and is spaced apart along the diameter of the circular hole. The second connector has a connecting groove on the corresponding side along the diameter of the circular hole. The first component insertion end has a circular cross-section, and the first connectors in the first connecting unit are arranged at intervals along the radial direction of the first component insertion end on the outer end wall of the first component insertion end.

7. The adjustable center distance structure according to claim 6, characterized in that, The total span of the first connecting unit along the radial direction of the insertion end of the first component is equal; The maximum distance between the two first connectors in the first connecting unit along the radial direction of the insertion end of the first component is the total span of the first connecting unit along the radial direction of the insertion end of the first component.

8. The adjustable center distance structure according to claim 6, characterized in that, The maximum distance between the first connecting unit and the center of the cross-section of the first component insertion end along the radial direction of the first component insertion end is not equal.

9. The adjustable center distance structure according to claim 2, characterized in that, The first connecting parts are all arranged perpendicularly to the central axis of the first component.

10. An adjustable center distance structure according to claim 1, characterized in that, The first connecting units are arranged at circumferential intervals.

Images