Positioning mechanism, device and method

Abstract

The present invention relates to the technical field of positioning devices, and specifically to a positioning mechanism, device and method. The positioning mechanism of the present invention includes: a base and a roller assembly, the base is provided with a connecting structure, the roller assembly is connected to the connecting structure, the base is provided with a positioning surface, and a channel for the passage of the part to be positioned is formed between the positioning surface and the roller assembly; the connecting structure includes a proximal connecting portion close to the positioning surface, and a distal connecting portion relatively far away from the positioning surface, when the positioning mechanism is in an unpositioned state, the roller assembly is provided at the distal connecting portion, and the cross-sectional size of the channel is larger than the part to be positioned, and when the positioning mechanism is in a positioned state, the roller assembly is provided at the proximal connecting portion, and the cross-sectional size of the channel is smaller than or equal to the part to be positioned. The positioning mechanism of the present invention positions the part to be positioned by the positioning mechanism, thereby facilitating welding for operators and improving welding efficiency and welding effect.

Description

Technical Field

[0001] The present invention relates to the technical field of positioning devices, and in particular to a positioning mechanism, device and method. Background Art

[0002] Gas water heaters have become a common household appliance in people's daily lives. During the manufacturing process of gas water heaters, it is necessary to connect the various pipes in the gas water heaters. The outlet pipes and inlet pipes of existing gas water heaters mostly use copper joints and copper pipes. When connecting the copper joints and copper pipes, sometimes it is necessary to connect the copper joints and copper pipes by welding. In the prior art, when welding, the copper joints and copper pipes are pressed down by heavy objects before welding. Due to the lack of effective positioning means, it is difficult for operators to accurately position the copper joints and copper pipes, resulting in inconvenient welding, low welding efficiency, and poor welding effect. Summary of the Invention

[0003] The present invention provides a positioning mechanism, device and method to solve the problem in the prior art that it is difficult for operators to accurately position copper joints and copper pipes, resulting in inconvenient welding, low welding efficiency and poor welding effect.

[0004] The technical solution of the present invention is:

[0005] A positioning mechanism comprises: a base and a roller assembly, wherein a connecting structure is provided on the base, and the roller assembly is connected to the connecting structure; a positioning surface is provided on the base, and a channel for a part to be positioned to pass through is formed between the positioning surface and the roller assembly; the connecting structure comprises a proximal connecting portion close to the positioning surface, and a distal connecting portion relatively far away from the positioning surface; when the positioning mechanism is in an unpositioned state, the roller assembly is provided at the distal connecting portion, and the cross-sectional size of the channel is larger than the part to be positioned; when the positioning mechanism is in a positioned state, the roller assembly is provided at the proximal connecting portion, and the cross-sectional size of the channel is smaller than or equal to the part to be positioned so as to clamp the part to be positioned.

[0006] Preferably, the roller assembly is slidably connected to the connecting structure to form a sliding path, and the normal of the positioning surface is arranged at an angle to the normal of the straight line where the sliding path is located.

[0007] Preferably, a blocking portion is provided on the base, and the blocking portion is provided at the proximal connecting portion of the connecting structure for blocking the roller assembly.

[0008] Preferably, the connecting structure is a slide rail provided on the base, and the slide rail and the blocking portion form a U-shaped groove structure.

[0009] Preferably, the positioning surface includes: an adapter portion, which is arranged corresponding to the channel and whose outer contour is adapted to the size of the part to be positioned.

[0010] Preferably, the base comprises: a base plate and a support plate, there is at least one support plate, the positioning surface is provided on the base plate, and the connecting structure is provided on the support plate.

[0011] Preferably, two support plates are provided, the two support plates are arranged opposite to each other on the base plate, and the channel is provided between the two support plates.

[0012] Preferably, the roller assembly includes: at least two positioning wheels, the channel is formed between the two positioning wheels and the positioning surface, when the positioning mechanism is in the positioning state, the positioning wheels are against the part to be positioned, and the cross-sectional size of the channel is smaller than or equal to that of the part to be positioned.

[0013] Preferably, the positioning wheel includes a hemispherical portion, and the channel is formed between the hemispherical portion and the positioning surface.

[0014] Preferably, the positioning wheel is an elastic member, or the positioning wheel is provided with a deformation layer that abuts against the member to be positioned.

[0015] Preferably, a plurality of concave portions are provided on the hemispherical portion along the axial direction of the hemispherical portion.

[0016] Preferably, the plurality of concave portions are all arranged on the spherical surface of the hemispherical portion and are distributed in a stepped manner.

[0017] Preferably, the roller assembly further includes a connecting shaft, the positioning wheel is arranged on the connecting shaft, and the connecting shaft is connected to the connecting structure.

[0018] A positioning device comprises the positioning mechanism described above.

[0019] Preferably, the positioning device comprises at least two positioning mechanisms, and the two positioning mechanisms are arranged opposite to each other.

[0020] Preferably, the positioning device comprises a detection mechanism and a correction mechanism, wherein the detection mechanism is used to detect whether the two positioning mechanisms are aligned, and the correction mechanism is used to correct the positioning mechanisms according to feedback values from the detection mechanism.

[0021] A positioning method, used for the positioning mechanism described above, comprises: moving the member to be positioned in a direction away from the distal connection portion.

[0022] The technical solution of the present invention has the following advantages:

[0023] The positioning mechanism of the present invention includes: a base and a roller assembly, the base is provided with a connecting structure, and the roller assembly is connected to the connecting structure. The base is also provided with a positioning surface, and a channel is formed between the positioning surface and the roller assembly; the connecting structure includes a proximal connecting portion close to the positioning surface, and a distal connecting portion relatively far away from the positioning surface. When in use, the positioning mechanism is first in an unpositioned state, the roller assembly is provided at the distal connecting portion, the cross-sectional size of the channel is larger than the part to be positioned, and then the part to be positioned is passed through the channel, and the roller assembly is provided at the proximal connecting portion. When the roller assembly is provided at the proximal connecting portion, the cross-sectional size of the channel is smaller than or equal to the part to be positioned, thereby clamping the part to be positioned and achieving positioning, that is, the positioning mechanism is in a positioning state. The positioning mechanism of the present invention positions the part to be positioned by the positioning mechanism, thereby facilitating welding for operators, improving welding efficiency, and improving welding effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 is a schematic diagram of a three-dimensional view of the positioning mechanism of the present invention;

[0026] Figure 2 is a schematic diagram of a side view of the positioning mechanism of the present invention;

[0027] Figure 3 for Figure 1 Schematic diagram of the enlarged view of part A shown.

[0028] Description of reference numerals:

[0029] 1-base; 2-roller assembly; 3-positioning surface; 4-connecting structure; 5-blocking part; 6-adapting part; 7-base plate; 8-support plate; 9-positioning wheel; 10-hemispherical part; 11-concave part; 12-connecting shaft. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Example 1

[0035] This embodiment provides a positioning mechanism, such as Figure 1-Figure 3 As shown, the apparatus comprises a base 1 and a roller assembly 2. The base 1 is provided with a connecting structure 4, and the roller assembly 2 is connected to the connecting structure 4. The base 1 is also provided with a positioning surface 3, and a channel is formed between the positioning surface 3 and the roller assembly 2 for the positioning member to pass through. The connecting structure 4 includes a proximal connecting portion close to the positioning surface 3 and a distal connecting portion relatively far from the positioning surface 3.

[0036] The base 1 includes: a base plate 7 and a support plate 8, the positioning surface 3 is provided on the base plate 7, the connecting structure 4 is provided on the support plate 8, the two support plates 8 are provided on the base plate 7 relative to each other, and the channel is provided between the two support plates 8. In this embodiment, the base plate 7 and the support plates 8 are both rectangular structures, the lateral dimension of the base plate 7 matches the distance between the two support plates 8, and the longitudinal dimension of the base plate 7 matches the support plates 8. Specifically, as Figure 1 and Figure 2 As shown, the positioning surface 3 refers to the upper surface of the substrate 7. The positioning mechanism of this embodiment is used to Figure 2 The base 1 is placed on a horizontal workbench or ground. The description of the directions in other parts of this embodiment are based on the Figure 2The position shown is used for illustration. It should be noted that those skilled in the art may change the orientation of the positioning mechanism of this embodiment according to specific circumstances. As a convertible embodiment, in this embodiment, a support plate 8 may be provided, and the roller assembly 2 is connected to the support plate 8 via a connecting structure 4 provided on the support plate 8.

[0037] During use, the positioning mechanism is initially in an unpositioned state. The roller assembly 2 is positioned at the distal connection portion, and the channel cross-sectional dimensions are larger than the part to be positioned. The part to be positioned is then passed through the channel, and the roller assembly 2 is then positioned at the proximal connection portion. When the roller assembly 2 is positioned at the proximal connection portion, the channel cross-sectional dimensions are smaller than or equal to the part to be positioned, thereby clamping the part to be positioned and achieving positioning. This means that the positioning mechanism is in a positioned state. In other words, when the roller assembly 2 is positioned at the distal connection portion, the positioning mechanism is in an unpositioned state; when the roller assembly 2 is positioned at the proximal connection portion, the positioning mechanism is in a positioned state. After the welding process is completed, the roller assembly 2 is switched from the proximal connection portion to the distal connection portion of the connection structure, switching the positioning mechanism from a positioned state to an unpositioned state. In this embodiment, the distal connection portion and the proximal connection portion of the connection structure 4 are relative terms, referring to the position of the positioning surface 3. Therefore, the positions of the distal connection portion and the proximal connection portion can be variable or fixed. In this embodiment, the part to be positioned is a copper pipe or a copper joint. The positioning mechanism of this embodiment can be used to clamp and position the copper pipe or copper joint in the gas water heater, facilitating welding for operators, improving welding efficiency, and enhancing welding results. It should be noted that the part to be positioned in this embodiment can be any component that can be positioned using the positioning mechanism of this embodiment, and no further details will be given here.

[0038] The roller assembly 2 is slidably connected to the connecting structure 4 to form a linear sliding path, such as Figure 2As shown, the angle formed by the normal line L1 of the positioning surface 3 and the normal line L2 of the straight line where the sliding path is located is α, and 90°<α<180°. The movement process of the roller assembly 2 is continuous. When positioning the part to be positioned, the roller assembly 2 slides from the distal connection part of the connecting structure 4 to the proximal connection part. When welding is completed, the roller assembly 2 slides from the proximal connection part of the connecting structure 4 to the distal connection part. In this embodiment, the positions of the distal connection part and the proximal connection part are variable. Parts to be positioned of different sizes have different distances from the positioning surface 3 when in the positioning state and different distances from the positioning surface 3 when in the non-positioning state. As an embodiment in which the connecting structure 4 is convertible, the roller assembly 2 is snap-fitted or fixedly connected to the connecting structure 4. The position of the roller assembly 2 switches between the proximal connection part and the distal connection part of the connecting structure 4. In this variable embodiment, the positions of the distal connection part and the proximal connection part are fixed and unchanged. The movement process of the roller assembly 2 is discrete. It should be noted that the clamping or fixed connection between the roller assembly 2 and the connecting structure 4 can adopt any existing technical means, and a bolt structure is preferably used to facilitate disassembly.

[0039] In this embodiment, Figure 2 As shown, the roller assembly 2 is slid from the distal connection part of the connecting structure 4 to the proximal connection part by moving the part to be positioned. Specifically, after the roller assembly 2 is connected to the distal connection part of the connecting structure 4, the roller assembly 2 slides from the distal connection part to the proximal connection part along the sliding path under the action of its own gravity until it hits the part to be positioned, stops sliding after being blocked by the part to be positioned, and then moves the part to be positioned in the direction away from the distal connection part of the connecting structure 4. Due to the friction between the part to be positioned and the roller assembly 2, the part to be positioned can drive the roller assembly 2 to slide toward the proximal connection part of the connecting structure 4, so that the cross-sectional size of the channel is smaller than or equal to the part to be positioned, thereby clamping the part to be positioned.

[0040] The positioning mechanism of this embodiment also includes: a blocking portion 5 provided on the base 1. In this embodiment, the connecting structure 4 is a slide rail provided on the base 1. The blocking portion 5 closes the proximal connecting portion of the connecting structure 4 to prevent the roller assembly 2 from being separated from the connecting structure 4 when there is no part to be positioned in the channel. The slide rail and the blocking portion form a U-shaped groove structure, and the sliding path is parallel to the length direction of the U-shaped groove. It should be pointed out that the distal connecting portion of the connecting structure 4 is in an open state to facilitate the installation and disassembly of the roller assembly 2, and the structure of the connecting structure 4 is simple and easy to process. As a convertible embodiment, the distal connecting portion of the connecting structure 4 can also be closed.

[0041] Specifically, the positioning surface 3 includes: an adapter part 6, which is arranged corresponding to the channel, and the outer contour of the adapter part 6 is adapted to the size of the part to be positioned. When in use, one end of the part to be positioned is passed through the channel along the adapter part 6, and the adapter part 6 plays a positioning role for the part to be positioned; when the roller assembly 2 is at the proximal connection part of the connecting structure 4, it clamps the part to be positioned, and the adapter part 6 makes the force-bearing area of the part to be positioned larger and the force more uniform, thereby avoiding local deformation caused by excessive force.

[0042] The roller assembly 2 includes at least two positioning wheels 9, wherein the channel is formed between the two positioning wheels 9 and the positioning surface 3. When the positioning mechanism is in the positioning state, the positioning wheels 9 abut against the part to be positioned, and the cross-sectional size of the channel is smaller than or equal to the part to be positioned. The two positioning wheels 9 can position the part to be positioned from two directions, making the positioning more stable and reliable. As a convertible embodiment of the roller assembly 2, a positioning wheel 9 is provided, which is arranged between the two support plates 8 and corresponding to the channel.

[0043] As a further improvement to the roller assembly 2, the positioning wheel 9 includes a hemispherical portion 10. The hemispherical portions 10 on the two positioning wheels 9 are correspondingly disposed and form the channel with the positioning surface 3. In other words, the hemispherical portions 10 are disposed adjacent to the channel. The spherical surface of the hemispherical portion 10 can abut against various sized positioning parts, providing a wider range of applicability compared to flat or multi-segment surfaces.

[0044] A plurality of concave portions 11 are provided on the hemispherical portion 10 along the axial direction of the hemispherical portion 10. It should be noted that in this embodiment, the positioning wheel 9 adopts a symmetrical structure, that is, each positioning wheel 9 includes two mirror-imaged hemispherical portions 10. After one hemispherical portion 10 has been used for a long time, the position of the positioning wheel 9 can be swapped and the other hemispherical portion 10 can be used to extend the service life of the positioning wheel 9.

[0045] Specifically, the plurality of concave portions 11 are all arranged on the spherical surface of the hemispherical portion 10 and are distributed in a stepped manner. In this embodiment, when the positioning wheel 9 is an elastic member, the outer layer of the positioning wheel 9 is provided with a concave portion 11 corresponding to the adapter portion. As a convertible embodiment, the positioning wheel 9 can use a hard roller, and add a deformation layer outside the hard roller. The deformation layer is provided with a concave portion 11 corresponding to the adapter portion. The deformation layer achieves the same effect as setting the positioning wheel 9 as an elastic member. When the roller assembly 2 is at the proximal connection portion of the connecting structure 4 to clamp the part to be positioned, the concave portion 11 is extended and deformed, so that the force area of the part to be positioned is larger and the friction force is greater, which makes it easier for the part to be positioned to drive the roller assembly 2 to slide toward the proximal connection portion of the connecting structure 4, thereby clamping the part to be positioned. In addition, the force on the part to be positioned is more uniform, avoiding local excessive force on the part to be positioned and deformation.

[0046] Specifically, the roller assembly 2 also includes a connecting shaft 12, the positioning wheel 9 is arranged on the connecting shaft 12, and the connecting shaft 12 is connected to the connecting structure 4. As a preferred embodiment, the positioning wheel 9 is detachably connected to the connecting shaft 12 to facilitate the replacement of the position of the positioning wheel 9.

[0047] As a convertible embodiment, Figure 1 As shown, the plurality of concave portions 11 may be arranged in a gradual manner on the spherical surface of the hemispherical portion 10, that is, the plurality of concave portions 11 are denser near the channel, and along the channel, the plurality of concave portions 11 are denser. Figure 1 In the direction indicated by the middle arrow, the distance between the plurality of concave portions 11 gradually increases. In addition, the size of the plurality of concave portions 11 is the smallest at the position close to the channel. Figure 1 In the direction indicated by the middle arrow, the single concave portion 11 gradually increases in size, thereby being better used for positioning parts to be positioned of different sizes.

[0048] Example 2

[0049] This embodiment provides a positioning device, such as Figure 1-Figure 3 As shown, it includes the positioning mechanism described in embodiment 1.

[0050] The positioning device of this embodiment includes at least two positioning mechanisms, which are arranged opposite each other. The two positioning mechanisms can respectively position the two parts to be welded, freeing the operator's hands. For example, using a gas water heater of this embodiment as an example, the positioning device can position the copper pipe and copper joint in the gas water heater to facilitate welding.

[0051] The positioning device of this embodiment includes a detection mechanism and a correction mechanism. The detection mechanism is used to detect whether the two positioning mechanisms are aligned, and the correction mechanism is used to correct the positioning mechanisms according to the feedback value of the detection mechanism.

[0052] As an example of the detection mechanism, the detection mechanism includes a signal sending module, a signal receiving module and a processing module. The signal sending module is set on one of the positioning mechanisms, and the signal receiving module is set on the other positioning mechanism. When the sending module and the signal receiving module are connected, the two positioning mechanisms are aligned, otherwise they are not aligned.

[0053] As an example of a correction mechanism, the correction mechanism includes a transverse correction motor and a longitudinal correction motor connected to the positioning mechanism. The processing module is connected to the transverse correction motor and the longitudinal correction motor. The correction mechanism corrects the positioning device via the transverse correction motor and the longitudinal correction motor based on the feedback value from the detection mechanism. It should be noted that the detection mechanism and the correction mechanism in this embodiment can be implemented using other existing technical means and will not be further described here.

[0054] Example 3

[0055] This embodiment provides a positioning method, such as Figure 1-Figure 3 As shown, the positioning mechanism described in Example 1 includes: moving the part to be positioned in a direction away from the distal connection portion of the connecting structure 4. After the roller assembly 2 is connected to the distal connection portion of the connecting structure 4, the roller assembly 2 slides along the sliding path under the action of its own weight until it hits the part to be positioned, stops sliding after being blocked by the part to be positioned, and then moves the part to be positioned in a direction away from the distal connection portion of the connecting structure 4. Due to the friction between the part to be positioned and the roller assembly 2, the part to be positioned can drive the roller assembly 2 to slide toward the proximal connection portion of the connecting structure 4, so that the cross-sectional size of the channel is less than or equal to the part to be positioned, thereby clamping the part to be positioned and achieving positioning of the part to be positioned. It should be noted that, in this embodiment, the positioning state of the part to be positioned by the positioning mechanism includes three situations: insufficient positioning, moderate positioning and excessive positioning. Moderate positioning refers to the situation where the positioning mechanism clamps and positions the part to be positioned and does not cause deformation of the part to be positioned. During the positioning process, the operator should pay attention to the deformation of the part to be positioned and the force during the pulling process, so as to achieve appropriate positioning and avoid insufficient positioning and excessive positioning.

[0056] As an improved implementation method, a pulling mechanism can be set to pull the part to be positioned instead of manual pulling. The pulling mechanism includes a telescopic mechanism and a tension sensor. The telescopic mechanism is connected to the part to be positioned through the tension sensor. When the set tension value is reached, the telescopic mechanism stops moving, and then the tension sensor is separated from the part to be positioned, and the telescopic mechanism contracts. At this time, the positioning mechanism is in a moderate positioning state.

[0057] The positioning method of this embodiment uses the friction between the to-be-positioned piece and the roller assembly 2 to achieve accurate positioning of pieces of different sizes. Specifically, because the positions of the roller assembly 2 at the proximal connection portion of the connecting structure 4 are different for pieces of different sizes, if the same position is used to position pieces of different sizes, insufficient positioning or excessive positioning may occur.

[0058] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A positioning mechanism, characterized in that: include: A base and a roller assembly, wherein a connecting structure is provided on the base, and the roller assembly is connected to the connecting structure. A positioning surface is provided on the base, and a channel for the part to be positioned to pass through is formed between the positioning surface and the roller assembly; the connecting structure includes a proximal connecting portion close to the positioning surface, and a distal connecting portion relatively far away from the positioning surface. When the positioning mechanism is in an unpositioned state, the roller assembly is provided at the distal connecting portion, and the cross-sectional size of the channel is larger than the part to be positioned. When the positioning mechanism is in a positioned state, the roller assembly is provided at the proximal connecting portion, and the cross-sectional size of the channel is smaller than or equal to the part to be positioned so as to clamp the part to be positioned.

2. The positioning mechanism according to claim 1, wherein: The roller assembly is slidably connected to the connecting structure to form a sliding path, and the normal line of the positioning surface is arranged at an angle to the normal line of the straight line where the sliding path is located.

3. The positioning mechanism according to claim 2, characterized in that: The base is provided with a blocking portion, which is provided at the proximal connecting portion of the connecting structure and is used to block the roller assembly.

4. The positioning mechanism according to claim 3, characterized in that: The connecting structure is a slide rail provided on the base, and the slide rail and the blocking portion form a U-shaped groove structure.

5. The positioning mechanism according to claim 1, characterized in that: The positioning surface includes: an adapter portion, which is arranged corresponding to the channel and whose outer contour is adapted to the size of the part to be positioned.

6. The positioning mechanism according to claim 1, wherein: The base includes: a base plate and a support plate, there is at least one support plate, the positioning surface is arranged on the base plate, and the connecting structure is arranged on the support plate.

7. The positioning mechanism according to claim 6, characterized in that: There are two support plates, which are arranged opposite to each other on the base plate, and the channel is arranged between the two support plates.

8. The positioning mechanism according to any one of claims 1 to 7, characterized in that: The roller assembly includes: at least two positioning wheels, the channel is formed between the two positioning wheels and the positioning surface, when the positioning mechanism is in the positioning state, the positioning wheels abut against the part to be positioned, and the cross-sectional size of the channel is smaller than or equal to that of the part to be positioned.

9. The positioning mechanism according to claim 8, characterized in that: The positioning wheel includes a hemispherical portion, and the channel is formed between the hemispherical portion and the positioning surface.

10. The positioning mechanism according to claim 8, characterized in that: The positioning wheel is an elastic member, or the positioning wheel is provided with a deformation layer that abuts against the member to be positioned.

11. The positioning mechanism according to claim 9, characterized in that: A plurality of concave portions are provided on the hemispherical portion along the axial direction of the hemispherical portion.

12. The positioning mechanism according to claim 11, characterized in that: The plurality of concave portions are all arranged on the spherical surface of the hemispherical portion and are distributed in a stepped manner.

13. The positioning mechanism according to claim 8, characterized in that: The roller assembly further includes a connecting shaft, the positioning wheel is arranged on the connecting shaft, and the connecting shaft is connected to the connecting structure.

14. A positioning device, characterized in that: The method comprises the positioning mechanism according to any one of claims 1 to 13.

15. The positioning device according to claim 14, characterized in that It comprises at least two positioning mechanisms, and the two positioning mechanisms are arranged opposite to each other.

16. The positioning device according to claim 15, characterized in that It comprises a detection mechanism and a correction mechanism, wherein the detection mechanism is used to detect whether the two positioning mechanisms are aligned, and the correction mechanism is used to correct the positioning mechanisms according to the feedback value of the detection mechanism.

17. A positioning method, characterized in that: The positioning mechanism according to any one of claims 2 to 13 comprises: moving the member to be positioned in a direction away from the distal connection portion.

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