Positioning device and welding equipment thereof

Abstract

The utility model relates to a positioning device and welding equipment. The positioning device comprises: a first positioning mechanism and a second positioning mechanism. The first positioning mechanism comprises a first positioning member, and the second positioning mechanism comprises a second positioning member and a three-claw clamping member. The three-claw clamping member is used to clamp the second connecting member to ensure the concentricity between the second connecting member and the three-claw clamping member, and the cooperation of the first positioning member and the second positioning member can ensure the relative position relationship between the first positioning mechanism and the second positioning mechanism, thereby ensuring the concentricity between the first connecting member and the second connecting member.

Description

Technical Field

[0001] The utility model relates to the technical field of positioning, in particular to a welding device for a connecting piece. Background Art

[0002] During the assembly process of cylindrical batteries, the cylindrical shell and the connecting piece need to be connected together to output the current inside the battery. During the assembly process, the concentricity of the cylindrical shell and the connecting piece needs to be relatively high, but it is difficult to ensure the concentricity of the two in the existing technology. Utility Model Content

[0003] Based on this, it is necessary to provide a positioning device and welding equipment to improve the above defects in order to solve the problem that the concentricity of the cylindrical shell and the connecting piece is difficult to ensure in the prior art.

[0004] On one hand, the present application provides a positioning device for positioning a first connecting member and a second connecting member, the positioning device comprising:

[0005] A first positioning mechanism, the first positioning mechanism comprising a first positioning member;

[0006] A second positioning mechanism, the second positioning mechanism comprising a second positioning member and a three-claw clamping member;

[0007] During positioning, the first connecting member is placed in the first positioning mechanism, the second connecting member is clamped in the three-jaw clamp, and the first positioning member and the second positioning member are arranged in cooperation to ensure the concentricity of the first connecting member and the second connecting member.

[0008] Using a three-jaw clamp to clamp the second connecting member can ensure the concentricity between the second connecting member and the three-jaw clamp. At the same time, using the cooperation of the first positioning member and the second positioning member can ensure the relative position relationship between the first positioning mechanism and the second positioning mechanism, thereby ensuring the concentricity between the first connecting member and the second connecting member.

[0009] In some embodiments, the positioning device further includes a first driving member, which includes a moving part and a rotating part, the moving part drives the three-jaw clamp to tighten or loosen, and the rotating part drives the three-jaw clamp to rotate.

[0010] In some embodiments, the second positioning mechanism further includes a detection member, and the detection member is disposed corresponding to the second connecting member.

[0011] In some embodiments, a suction member is disposed between the three jaws of the three-jaw clamp.

[0012] In some embodiments, the adsorbing member is a magnetic member, and the second connecting member is a magnet.

[0013] In some embodiments, the second positioning mechanism further includes a mounting member, and the second positioning member and the three-jaw clamping member are mounted on the mounting member.

[0014] In some embodiments, the first positioning member is a pin shaft, and the second positioning member is a pin hole matching with the pin shaft.

[0015] In some embodiments, a surface of the first positioning mechanism facing the second connecting member is provided with an abutment portion, a surface of the abutment portion facing the second connecting member is an abutment surface, and the first connecting member is placed on the abutment surface.

[0016] In some embodiments, the first positioning mechanism further includes a negative pressure portion, and the negative pressure portion is communicated with the abutting surface to absorb the first connecting member.

[0017] In some embodiments, a communication channel is provided on the first positioning mechanism, one end of the communication channel is communicated with the negative pressure portion, and the other end of the communication channel is communicated with the abutting surface.

[0018] In some embodiments, the positioning device further includes a second driving member, and the second driving member is drivingly connected to the first positioning mechanism and / or the second positioning mechanism.

[0019] On the other hand, the present application provides a welding device, including: the positioning device and the welding device, wherein the welding device is used to weld the first connecting member and the second connecting member together.

[0020] The concentricity of the first connecting member and the second connecting member is ensured by positioning the positioning device, and then the first connecting member and the second connecting member are welded together using a welding device.

[0021] In some embodiments, the welding device includes a welding channel, and the welding channel passes through the first positioning mechanism along the welding direction.

[0022] The above-mentioned positioning device and welding equipment use a three-jaw clamp to clamp the second connecting member to ensure the concentricity between the second connecting member and the three-jaw clamp. At the same time, the cooperation of the first positioning member and the second positioning member can ensure the relative position relationship between the first positioning mechanism and the second positioning mechanism, thereby ensuring the concentricity between the first connecting member and the second connecting member. Subsequently, the welding device can be used to weld the first connecting member and the second connecting member together. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the welding equipment in the embodiment of the utility model;

[0024] Figure 2 for Figure 1A partial enlarged view of position A in the middle;

[0025] Figure 3 This is a schematic diagram of the structure of the first positioning mechanism in the embodiment of the utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the second positioning mechanism in the embodiment of the utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the three-claw clamp in the embodiment of the utility model;

[0028] Figure 6 It is a cross-sectional view of the first positioning mechanism in the embodiment of the utility model;

[0029] Figure 7 It is a structural schematic diagram of the abutment portion in an embodiment of the utility model.

[0030] Description of reference numerals:

[0031] 1 positioning device; 11 first positioning mechanism, 111 first positioning member, 112 abutting portion, 1121 abutting surface, 1122 communication channel, 113 negative pressure portion; 12 second positioning mechanism, 121 second positioning member, 122 three-claw clamping member, 123 adsorption member, 124 detection member, 125 installation member; 13 first driving member, 131 moving portion, 132 rotating portion; 14 second driving member;

[0032] 2 welding device;

[0033] 3 first connecting member;

[0034] 4 second connecting member;

[0035] 5 welding channels;

[0036] 6. Protective devices;

[0037] 7 Gas transmission channels. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0044] In order to more clearly understand the embodiments of the present application, the following Figures 1 to 7 The embodiments of the present application are described in detail.

[0045] like Figures 1 to 4 As shown, the present application provides a positioning device 1 for positioning a first connecting member 3 and a second connecting member 4, and the positioning device 1 includes a first positioning mechanism 11 and a second positioning mechanism 12. The first positioning mechanism 11 includes a first positioning member 111, and the second positioning mechanism 12 includes a second positioning member 121 and a three-claw clamping member 122; during positioning, the first connecting member 3 is placed in the first positioning mechanism 11, and the second connecting member 4 is clamped in the three-claw clamping member 122, and the first positioning member 111 and the second positioning member 121 are arranged in cooperation to ensure the concentricity of the first connecting member 3 and the second connecting member 4.

[0046] The first connector 3 and the second connector 4 can be any parts that need to ensure concentricity, such as a battery housing and a connecting piece. The first connector 3 can be clamped on the first positioning mechanism 11 by a clamping mechanism, or can be adsorbed on the first positioning mechanism 11 by adsorption, so as to determine the relative position of the first connector 3 on the first positioning mechanism 11.

[0047] like Figure 4 As shown, the second connecting member 4 is clamped in the second positioning mechanism 12 by the three-jaw clamp 122 , which can realize quick clamping on the one hand and improve the concentricity between the three-jaw clamp 122 and the second connecting member 4 on the other hand.

[0048] In some embodiments, the surface of the three-jaw clamp 122 close to the second connecting member 4 is configured as an arc surface adapted to the surface of the second connecting member 4 to improve the positioning accuracy and clamping stability of both.

[0049] The first positioning member 111 is arranged in cooperation with the second positioning member 121. In some embodiments, the first positioning member 111 is a convex portion, and the second positioning member 121 is a concave portion. The relative position of the first positioning mechanism 11 and the second positioning mechanism 12 is determined by inserting the first positioning member 111 into the second positioning member 121. In some embodiments, the first positioning member 111 is a concave portion, and the second positioning member 121 is a convex portion. The relative position of the first positioning mechanism 11 and the second positioning mechanism 12 is determined by inserting the second positioning member 121 into the first positioning member 111.

[0050] Using the three-jaw clamp 122 to clamp the second connecting member 4 can ensure the concentricity between the second connecting member 4 and the three-jaw clamp 122. At the same time, the cooperation of the first positioning member 111 and the second positioning member 121 can ensure the relative position relationship between the first positioning mechanism 11 and the second positioning mechanism 12, thereby ensuring the concentricity between the first connecting member 3 and the second connecting member 4.

[0051] like Figure 4 , 5 As shown, in some embodiments, the positioning device 1 further includes a first driving member 13, the first driving member 13 includes a moving part 131 and a rotating part 132, the moving part 131 drives the three-jaw clamp 122 to tighten or loosen, and the rotating part 132 drives the three-jaw clamp 122 to rotate.

[0052] The moving part 131 can be a driving device such as an electric cylinder, a pneumatic cylinder, or a hydraulic cylinder, which drives the three claws of the three-claw clamp 122 to move closer or farther from each other, so as to achieve the clamping and releasing of the second connecting member 4 by the three-claw clamp 122. Of course, in some embodiments, the moving part 131 can also be a motor to drive the three-claw clamp 122. The rotating part 132 can be a motor, which drives the three-claw clamp 122 to rotate while rotating.

[0053] The second connecting member 4 is clamped while driving the three-jaw clamp 122 to rotate. On the one hand, the concentricity between the second connecting member 4 and the three-claw clamp 122 can be improved. On the other hand, the surface quality of the connecting member 4 can be monitored during the rotation process, and unqualified products can be removed in time.

[0054] like Figure 4 As shown, in some embodiments, the second positioning mechanism 12 further includes a detection member 124 , and the detection member 124 is disposed corresponding to the second connecting member 4 .

[0055] The detection member 124 can be a two-dimensional code recognition device, which is set corresponding to the second connection member 4 and is used to detect and recognize the two-dimensional code on the second connection member 4, and can complete the binding of the second connection member 4 and the first connection member 3 and the storage of production process parameters, which is convenient for the backtracking of the production process and the troubleshooting of problems. The detection member 124 can also be an image recognition device, which is set corresponding to the second connection member 4 and is used to identify defects on the second connection member 4.

[0056] In some embodiments, the three-jaw clamp 122 is rotatable, which, on the one hand, facilitates the detection member 124 to perform all-round defect monitoring on the connecting member 4; on the other hand, the surface of the connecting member 4 with the QR code can be rotated to face the detection member 4, so that the surface of the connecting member 4 with the QR code can face any direction when loading, thereby simplifying the loading process.

[0057] like Figure 5 As shown, in some embodiments, a suction member 123 is disposed between the three jaws of the three-jaw clamp 122 .

[0058] The adsorbent 123 may be a negative pressure device, which forms negative pressure to adsorb the connector 4 between the three claws of the three-claw clamp 122. The adsorbent 123 may also be a magnetic member, which magnetically attracts the connector 4 between the three claws of the three-claw clamp 122.

[0059] By providing the adsorption member 123 , the connection member 4 can be pre-positioned before being clamped by the three-jaw clamping member 122 , thereby improving the position accuracy of the connection member 4 when being clamped.

[0060] In some embodiments, the adsorption member 123 is a magnetic member, and the second connecting member 4 is a magnet.

[0061] The adsorption member 123 may be a magnetic member made of a permanent magnet, and may be magnetically attached to the second connection member 4 made of a magnet to fix the relative position of the two. The adsorption member 123 may also be a magnetic member made of an electromagnet, and when the power is on, the adsorption member 123 may be magnetic and adsorb the connection member 4, and when the power is off, it is convenient to remove the connection member 4, thereby facilitating the placement and removal of the connection member 4.

[0062] By configuring the adsorption member 123 as a magnetic member and configuring the second connection member 4 as a magnet, the second connection member 4 and the three-claw clamping member 122 can be pre-positioned with a simple structure, and the operation is simple and the positioning is reliable.

[0063] In some embodiments, the second positioning mechanism 12 further includes a mounting member 125 , and the second positioning member 121 and the three-jaw clamping member 122 are mounted on the mounting member 125 .

[0064] The second positioning member 121 and the three-jaw clamping member 122 can be installed on the mounting member 125 by non-detachable means such as welding and gluing, or can be installed on the mounting member 125 by detachable means such as bolt connection and plug-in.

[0065] The relative position relationship between the second positioning member 121 and the three-jaw clamping member 122 can be determined by installing them on the mounting member 125, and then the relative position relationship between the first connecting member 3 and the second connecting member 4 can be determined by the cooperation between the first positioning member 111 and the second positioning member 121.

[0066] like Figure 3 and Figure 4 As shown, in some embodiments, the first positioning member 111 is a pin shaft, and the second positioning member 121 is a pin hole matched with the pin shaft.

[0067] The first positioning mechanism 11 and the second positioning mechanism 12 are positioned by the cooperation of the pin shaft and the pin hole. On the one hand, the pin shaft and the pin hole are easy to manufacture, and on the other hand, the positioning accuracy of the pin shaft and the pin hole is high.

[0068] The pin shaft can be cylindrical or square, and this embodiment of the application does not limit this.

[0069] In some embodiments, the end of the pin shaft is chamfered to facilitate the insertion of the pin shaft into the pin hole.

[0070] In some embodiments, the pin shaft is a tapered pin. On the one hand, the tapered pin is easy to guide into the pin hole. On the other hand, the tapered pin can still play a positioning role after the surface is worn, and the positioning accuracy is high and the reliability is strong.

[0071] like Figure 6 and Figure 7 As shown, in some embodiments, the surface of the first positioning mechanism 11 facing the second connecting member 4 is provided with an abutment portion 112 , the surface of the abutment portion 112 facing the second connecting member 4 is an abutment surface 1121 , and the first connecting member 3 is placed on the abutment surface 1121 .

[0072] The abutment portion 112 may be a boss formed by the first positioning mechanism 11 protruding toward the direction of the second connecting member 4, and the boss is integrally formed with the first positioning mechanism 12, which is convenient for production and manufacturing. Of course, in some embodiments, the abutment portion 112 may also be manufactured separately and then installed on the first positioning mechanism 11 in a detachable manner such as plug-in or bolt connection. With this design, on the one hand, when the abutment portion 112 is worn, only the abutment portion 112 needs to be replaced without replacing the entire first positioning mechanism 11; on the other hand, when the model and size of the first connecting member 3 change, the abutment portion 112 can be replaced to adapt to the production of first connecting members 3 of different models, thereby improving the compatibility of the positioning device.

[0073] like Figure 6 and Figure 7 As shown, in some embodiments, the first positioning mechanism 11 further includes a negative pressure portion 113 , and the negative pressure portion 113 is connected to the abutting surface 1121 to absorb the first connecting member 3 .

[0074] When the negative pressure part 113 is working, negative pressure can be drawn to the abutting surface 1211, so that the first connecting member 3 can be adsorbed on the abutting surface 1211, and the first connecting member 3 and the abutting portion 112 are fixed. After the negative pressure part 113 is disconnected, the negative pressure between the abutting surface 1211 and the first connecting member 3 disappears, and the first connecting member 3 can be separated from the abutting portion 112. The connection and separation of the first connecting member 3 and the abutting portion 112 are easily controlled by the negative pressure part 113, and the operation speed is fast and the reliability is strong.

[0075] like Figure 6 , Figure 7 As shown, in some embodiments, a positioning protrusion 1123 is provided on the abutting surface 1211 , and the positioning protrusion 1123 plays a pre-positioning role for the first connecting member 3 , thereby improving the concentricity of the first connecting member 3 and the first positioning mechanism 11 .

[0076] like Figure 6 , Figure 7 As shown, in some embodiments, a communication channel 1122 is provided on the abutting portion 112, one end of the communication channel 1122 is connected to the negative pressure portion 113, and the other end is connected to the abutting surface 1121. Providing the communication channel 1122 on the abutting portion can reduce the provision of additional pipelines, improve the integration of the device, and facilitate the maintenance of the device.

[0077] Of course, in some embodiments, the negative pressure portion 113 and the abutment surface 1121 may be connected via an external pipeline, which can avoid punching the abutment portion 112 , thereby increasing the strength of the abutment portion 112 and improving the machinability of the abutment portion 112 .

[0078] In some embodiments, the positioning device 1 further includes a second driving member 14 , which is drivingly connected to the first positioning mechanism 11 and / or the second positioning mechanism 12 .

[0079] The second driving member 14 can be a cylinder, an electric cylinder, or a motor, as long as it can drive the first positioning mechanism 11 and the second positioning mechanism 12 to move closer to or farther from each other. In some embodiments, the second driving member 14 is drivingly connected to the first positioning mechanism 11 to drive the first positioning mechanism 11 to move closer to or farther from the second positioning mechanism 12; in some embodiments, the second driving member 14 is drivingly connected to the second positioning mechanism 12 to drive the second positioning mechanism 12 to move closer to or farther from the first positioning mechanism 11; in some embodiments, the second driving member 14 is drivingly connected to the first positioning mechanism 11 and the second positioning mechanism 12 to drive the first positioning mechanism 11 and the second positioning mechanism 12 to move closer to or farther from each other.

[0080] like Figure 1 and Figure 2 As shown, the present application provides a welding device on the other hand, including: a positioning device 1 and a welding device 2, the welding device 2 is used to weld a first connecting member 3 and a second connecting member 4 together.

[0081] The concentricity of the first connecting member 3 and the second connecting member 4 is ensured by the positioning of the positioning device, and then the first connecting member and the second connecting member are welded together using the welding device 2.

[0082] like Figure 7 As shown, in some embodiments, the welding device includes a welding channel 5, and the welding channel 5 passes through the first positioning mechanism 11 along the welding direction.

[0083] In some embodiments, the welding channel 5 is formed by a through hole formed in the abutment portion 112. In some embodiments, the welding channel 5 can also be formed by a relief portion formed by the concave portion of the abutment portion 112. By providing the welding channel 5, the welding laser emitted by the welding device 2 can be smoothly irradiated on the first connecting member 3, thereby ensuring the welding quality of the first connecting member 3 and the second connecting member 4.

[0084] like Figure 1 As shown, in some embodiments, the welding equipment also includes a protective device 6, which delivers a protective gas such as carbon dioxide to the welding parts of the first connecting member 3 and the second connecting member 4 through a gas supply channel 7. On the one hand, the protective device 6 can blow away the welding slag, smoke, etc. generated by the welding to prevent them from blocking the laser and affecting the welding quality; on the other hand, the protective gas can prevent the welding surface from oxidizing and blackening, thereby improving the welding quality.

[0085] Specifically, Figures 1 to 7As shown, the first positioning mechanism 11 moves to the loading position, and the negative pressure part 113 starts to work, pumping negative pressure on the abutment surface 1211, so that the first connecting member 3 can be adsorbed on the abutment surface 1211, and the loading of the first connecting member 3 is realized. At the same time, the second connecting member 4 is loaded to the second positioning mechanism 12, and is pre-positioned on the second positioning mechanism 12 under the adsorption action of the adsorption member 123, and then the three-claw clamping member 122 rotates and holds the second connecting member 4 under the drive of the first driving member 13, completing the loading of the second connecting member and the detection of the second connecting member by the detection member 124.

[0086] Then, the second driving member 14 drives the first positioning mechanism 11 and the second positioning mechanism 12 to approach each other, and in this process, the first positioning member 111 is inserted into the second positioning member 121 to realize the positioning of the first positioning mechanism 11 and the second positioning mechanism 12. When the first positioning mechanism 11 and the second positioning mechanism 12 move to the welding position, the welding device 2 and the protective device 6 are started to complete the welding of the first connecting member 3 and the second connecting member 4.

[0087] After welding is completed, the negative pressure portion 113 stops working, the negative pressure between the abutting surface 1211 and the first connecting member 3 disappears, and the first connecting member 3 is separated from the abutting portion 112. Then, the second driving member 14 drives the first positioning mechanism 11 and the second positioning mechanism 12 to move away from each other. Finally, the three-claw clamping member 122 releases the second connecting member 4 under the drive of the first driving member 13, and the first connecting member 3 and the second connecting member 4 are unloaded.

[0088] The above-mentioned positioning device 1 and welding equipment use the three-jaw clamp 122 to clamp the second connecting member 4 to ensure the concentricity between the second connecting member 4 and the three-jaw clamp 122. At the same time, the cooperation of the first positioning member 111 and the second positioning member 121 can ensure the relative position relationship of the first positioning mechanism 11 and the second positioning mechanism 12, thereby ensuring the concentricity between the first connecting member 3 and the second connecting member 4. Subsequently, the welding device 2 can be used to weld the first connecting member 3 and the second connecting member 4 together.

[0089] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A positioning device for positioning a first connecting member and a second connecting member, characterized in that: The positioning device comprises: A first positioning mechanism, the first positioning mechanism comprising a first positioning member; A second positioning mechanism, the second positioning mechanism comprising a second positioning member and a three-claw clamping member; During positioning, the first connecting member is placed in the first positioning mechanism, the second connecting member is clamped in the three-jaw clamp, and the first positioning member and the second positioning member are arranged in cooperation to ensure the concentricity of the first connecting member and the second connecting member.

2. The positioning device according to claim 1, characterized in that: The positioning device further comprises a first driving member, which comprises a moving part and a rotating part. The moving part drives the three-jaw clamping member to tighten or loosen, and the rotating part drives the three-jaw clamping member to rotate.

3. The positioning device according to claim 2, characterized in that: The second positioning mechanism further includes a detection member, and the detection member is arranged corresponding to the second connecting member.

4. The positioning device according to any one of claims 1 to 3, characterized in that: A suction piece is arranged between the three claws of the three-claw clamp.

5. The positioning device according to claim 4, characterized in that: The adsorption member is a magnetic member, and the second connecting member is a magnet.

6. The positioning device according to claim 1, characterized in that: The second positioning mechanism also includes a mounting member, and the second positioning member and the three-claw clamping member are mounted on the mounting member.

7. The positioning device according to claim 1, characterized in that: The first positioning member is a pin shaft, and the second positioning member is a pin hole matched with the pin shaft.

8. The positioning device according to claim 1, characterized in that: A surface of the first positioning mechanism facing the second connecting member is provided with an abutment portion, and a surface of the abutment portion facing the second connecting member is an abutment surface, and the first connecting member is placed on the abutment surface.

9. The positioning device according to claim 8, characterized in that: The first positioning mechanism further includes a negative pressure portion, which is communicated with the abutting surface to absorb the first connecting member.

10. The positioning device according to claim 9, characterized in that: The abutting portion is provided with a communication channel, one end of the communication channel is communicated with the negative pressure portion, and the other end of the communication channel is communicated with the abutting surface.

11. The positioning device according to claim 1, characterized in that: The positioning device further comprises a second driving member, which is drivingly connected to the first positioning mechanism and / or the second positioning mechanism.

12. A welding device, characterized in that: include The positioning device according to claim 1, and A welding device is used to weld the first connecting member and the second connecting member together.

13. The welding device according to claim 12, characterized in that The welding device comprises a welding channel, and the welding channel penetrates the first positioning mechanism along a welding direction.

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