Positioning mechanism and welding device

Abstract

The utility model provides a locating mechanism which is used for locating a workpiece and a small piece so as to improve the welding quality, the workpiece is provided with a welding groove, the side wall of the welding groove is provided with a welding position used for placing the small piece, and the locating mechanism comprises a bearing seat, a locating block and a locating block, the pressing and holding assembly comprises a pressing and holding piece and a clamping piece, the clamping piece is arranged on the bearing seat, and the pressing and holding piece is rotationally connected with the bearing seat and matched with the clamping piece in a clamping mode to press and hold the workpiece to the bearing seat; the positioning assembly comprises a mounting part, a positioning part, an abutting and pushing part and a rotating part, the mounting part is arranged on the bearing seat, the positioning part is rotationally connected with the mounting part and comprises a positioning part, when the small part is arranged on the welding position, the positioning part is used for stretching into the welding groove and is located on the side, away from the welding position, of the small part, and the abutting and pushing part is movably arranged on the mounting part; the rotating piece is rotationally connected with the mounting piece and matched with the tooth groove of the abutting piece, and the rotating piece is used for driving the abutting piece to abut against the workpiece so that the workpiece can abut against the small piece to the positioning part. The utility model further provides a welding device comprising the positioning mechanism and the welding mechanism.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding technical field, concretely relates to a positioning mechanism and welding device. BACKGROUND

[0002] It is necessary to ensure that the position of the small piece relative to the workpiece is fixed during welding, so as to improve the quality of welding the small piece to the workpiece. At present, when welding the small piece and the workpiece, the workpiece is usually positioned first, then the small piece is placed on the workpiece, and the elasticity of the spring is used to resist the small piece to the workpiece, finally, the small piece and the workpiece are welded by the welding mechanism. However, the size of the small piece is small, the spring force corresponding to the spring used is small, and there will be a gap between the small piece and the workpiece during welding, which leads to a decrease in welding quality. SUMMARY

[0003] In view of the above, it is necessary to provide a positioning mechanism and welding device to improve the welding quality.

[0004] The utility model embodiment provides a positioning mechanism for positioning workpiece and small piece, the workpiece is equipped with welding groove, the side wall of welding groove is equipped with welding position for placing small piece, the positioning mechanism includes:

[0005] Bearing seat for bearing workpiece;

[0006] Pressing assembly, including pressing piece and clamping piece, the clamping piece is equipped in the bearing seat, the pressing piece is rotatably connected with the bearing seat and is used for clamping cooperation with the clamping piece to press the workpiece to the bearing seat;

[0007] Positioning assembly, including mounting, positioning piece, push piece and rotating piece, the mounting is equipped in the bearing seat, the positioning piece is rotatably connected with the mounting, and includes positioning part;When the small piece is equipped in the welding position, the positioning part is used to extend into the welding groove and is located on the side of the small piece away from the welding position, the push piece is movably equipped in the mounting, the rotating piece is rotatably connected with the mounting and is in gear slot cooperation with the push piece, and the rotating piece is used to drive the push piece to push the workpiece, so that the workpiece pushes the small piece to the positioning part.

[0008] In some embodiments, one side of the push piece is provided with a plurality of gear slots spaced along the movement direction of the push piece, and the rotating piece includes:

[0009] Rotating shaft, movably arranged in the mounting;

[0010] Gear, fixedly sleeved on the rotating shaft and engaged with a plurality of gear slots;

[0011] A rotating handle is connected to the rotating shaft and used to drive the gear to rotate through the rotating shaft, and the gear drives the pushing piece to push the workpiece to make the workpiece abut against the small piece to the positioning part or drives the pushing piece to move away from the workpiece.

[0012] In some embodiments, the mounting member comprises:

[0013] A mounting body is connected to the bearing seat and has a mounting slot, and the gear is accommodated in the mounting slot.

[0014] A fixed body is connected to the mounting body and has a movable through hole communicating with the mounting slot, and the pushing piece is movably inserted into the movable through hole and the mounting slot.

[0015] In some embodiments, the pushing piece comprises:

[0016] A pushing body is movably inserted into the movable through hole and the mounting slot, and one end of the pushing body is used to push the workpiece, and a plurality of gear grooves are arranged on a side of the pushing body facing the gear.

[0017] A stop body is connected to the pushing body and located on a side of the mounting slot away from the movable through hole, and used to abut against the mounting body to limit the pushing body.

[0018] In some embodiments, the positioning member comprises:

[0019] A turnover shaft is movably inserted into the mounting member.

[0020] A linkage body is connected to the turnover shaft.

[0021] A positioning body is detachably connected to the linkage body and comprises the positioning part.

[0022] In some embodiments, the positioning body further comprises:

[0023] A dismounting part, one end of the dismounting part is detachably connected to the linkage body, and the positioning part is vertically connected to an end of the dismounting part away from the linkage body.

[0024] A protruding part is connected to the positioning part and encloses the dismounting part and the positioning part to form a limiting slot, and the limiting slot is used to limit the small piece.

[0025] In some embodiments, the clamping member comprises:

[0026] A base block is arranged on the bearing seat.

[0027] A clamping body, one end of the clamping body is rotatably connected to the base block, and the other end of the clamping body is used to stop the pressing member.

[0028] An elastic body, two ends of the elastic body are respectively abutted to the base block and the clamping body.

[0029] In some embodiments, the pressing member comprises:

[0030] A turning body, one end of the turning body is rotationally connected to the bearing seat, and the clamping member is used to stop the other end of the turning body;

[0031] A pressing handle, connected to the turning body, is used to drive the turning body to rotate;

[0032] A flexible body, connected to the side of the turning body away from the pressing handle, is used to flexibly abut the workpiece.

[0033] In some embodiments, the bearing seat comprises:

[0034] A bottom plate;

[0035] A support frame, provided on the bottom plate and provided with a support slope relative to the bottom plate;

[0036] A bearing member, provided on the support slope, the pressing member is rotationally connected to the bearing member, and the clamping member and the mounting member are both provided on the bearing member.

[0037] The utility model embodiment further provides a welding device for welding a workpiece and a small piece, comprising:

[0038] The above-mentioned positioning mechanism;

[0039] A welding mechanism, adjacent to the positioning mechanism, is used to weld the small piece to the workpiece when the workpiece abuts the small piece to the positioning part.

[0040] In the above-mentioned positioning mechanism and welding device, the pressing member and the clamping member are clamped and matched to press the workpiece to the bearing seat, when the small piece is provided in the welding position, the positioning part extends into the welding groove and is located on the side of the small piece away from the welding position, the rotating member drives the abutting member to abut the workpiece when rotating, so as to abut the workpiece to the small piece to the positioning part, realizing the positioning of the small piece, after the positioning is completed, the rotating member is fixed, so that the position of the small piece relative to the workpiece is fixed in the welding process, thereby being beneficial to improving the welding quality of the small piece and the workpiece. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 The assembly diagram of the workpiece and the small piece suitable for the utility model embodiment.

[0042] Figure 2 The structural diagram of the positioning mechanism of the utility model embodiment.

[0043] Figure 3 The structural diagram of the positioning mechanism of the utility model embodiment. Figure 2A structural schematic view of the positioning assembly in the positioning mechanism shown.

[0044] Figure 4 For Figure 3 An exploded schematic view of the positioning assembly shown.

[0045] Figure 5 For Figure 2 An exploded schematic view of the clamping piece in the positioning mechanism shown.

[0046] Figure 6 For Figure 2 A structural schematic view of the bottom plate and the support frame in the positioning mechanism shown.

[0047] Figure 7 A structural schematic view of the welding device of the embodiment of the utility model.

[0048] Main element symbol explanation: positioning mechanism 100, bearing seat 110, bottom plate 111, support frame 112, support inclined surface 112a, bearing piece 113, bearing position 113a, positioning rod 114, positioning column 115, pressing assembly 120, pressing piece 121, overturning body 1211, pressing handle 1212, flexible body 1213, clamping piece 122, base block 1221, main body part 1221a, extension part 1221b, elastic groove 1221c, clamping body 1222, rotating column 1222a, clamping block 1222b, bending part 1222c, guide inclined surface 1222d, elastic body 1223, clamping screw 1224, positioning assembly 130, mounting piece 131, mounting body 1311, mounting groove 1311a, fixed body 1312, movable through hole 1312a, positioning piece 132, overturning shaft 1321, linkage body 1322, horizontal part 1322a, vertical part 1322b, positioning body 1323, positioning part 1323a, dismounting part 1323b, protruding part 1323c, limiting groove 1323d, pushing piece 133, gear slot 133a, pushing body 1331, stop body 1332, rotating piece 134, rotating shaft 1341, gear wheel 1342, rotating handle 1343, bearing 1344, workpiece 200, welding groove 200a, welding position 200b, small piece 300, welding mechanism 400, welding device 1000. DETAILED DESCRIPTION

[0049] The embodiments of the utility model are described in detail below, examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0050] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "connect" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connect, can be mechanical connection, also can be electric connection or can communicate with each other, can be directly connected, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements or the interaction of two elements.In the description of the utility model, it needs to explain, "multiple" the meaning is two or two or more, unless another explicit specific limitation.For the ordinary skill of the person of the art, can understand the specific meaning of the above-mentioned term in the utility model according to specific circumstances.

[0051] The embodiments of the present application are described in detail below with reference to the drawings.

[0052] Please see Figure 1 , Figure 1 The assembly diagram suitable for small parts and workpieces of the utility model embodiment is shown in the figure.Specifically, the workpiece 200 is provided with a welding groove 200a, and the side wall of the welding groove 200a is provided with a welding site 200b for placing the small part 300.Exemplarily, the workpiece 200 is a mobile phone middle frame, and the small part 300 is a spring piece.

[0053] Please see Figure 2 and Figure 3 The utility model embodiment provides a positioning mechanism 100 for positioning the workpiece 200 and the small part 300, and the positioning mechanism 100 comprises a bearing seat 110, a pressing and holding assembly 120 and a positioning assembly 130.The bearing seat 110 is used for bearing the workpiece 200, the pressing and holding assembly 120 comprises a pressing and holding piece 121 and a clamping piece 122, the clamping piece 122 is arranged on the bearing seat 110, and the pressing and holding piece 121 is rotatably connected to the bearing seat 110 and is used for clamping cooperation with the clamping piece 122 to press and hold the workpiece 200 to the bearing seat 110.The positioning assembly 130 comprises a mounting piece 131, a positioning piece 132, a pushing piece 133 and a rotating piece 134, the mounting piece 131 is arranged on the bearing seat 110, the positioning piece 132 is rotatably connected to the mounting piece 131 and comprises a positioning part 1323a.When the small part 300 is arranged on the welding site 200b, the positioning part 1323a is used for extending into the welding groove 200a and is located on the side of the small part 300 away from the welding site 200b, the pushing piece 133 is movably arranged on the mounting piece 131, the rotating piece 134 is rotatably connected to the mounting piece 131 and is in gear groove cooperation with the pushing piece 133, and the rotating piece 134 is used for driving the pushing piece 133 to push the workpiece 200, so that the workpiece 200 abuts against the small part 300 to the positioning part 1323a.

[0054] The positioning mechanism 100 is used to cooperate with the welding mechanism to weld the small piece 300 to the welding position 200b of the workpiece 200, so as to ensure that the position of the small piece 300 relative to the workpiece 200 is fixed during the welding process, thereby improving the welding quality of the small piece 300 and the workpiece 200.

[0055] Please refer to Figure 4 In some embodiments, one side of the pushing piece 133 is provided with a plurality of tooth grooves 133a which are arranged at intervals along the movement direction of the pushing piece 133, and the rotating piece 134 comprises a rotating shaft 1341, a gear 1342 and a rotating handle 1343. The rotating shaft 1341 is movably arranged in the mounting piece 131, the gear 1342 is sleeved and fixed on the rotating shaft 1341 and is engaged with the plurality of tooth grooves 133a, and the rotating handle 1343 is connected with the rotating shaft 1341 and is used to drive the gear 1342 to rotate through the rotating shaft 1341. When the gear 1342 rotates, the pushing piece 133 is driven to push the workpiece 200 so as to make the workpiece 200 abut against the small piece 300 to the positioning part 1323a, or the pushing piece 133 is driven to move away from the workpiece 200.

[0056] For example, when the rotating handle 1343 is rotated clockwise, the gear 1342 rotates with the rotating shaft 1341 to drive the pushing piece 133 to move close to the workpiece 200, and after the pushing piece 133 abuts against the workpiece 200, the rotating handle 1343 is continuously rotated, so that the workpiece 200 is pushed by the pushing piece 133 to abut against the small piece 300 to the positioning part 1323a, thereby realizing the positioning of the small piece 300. When the rotating handle 1343 is rotated counterclockwise, the gear 1342 rotates with the rotating shaft 1341 to drive the pushing piece 133 to move away from the workpiece 200, thereby realizing the separation of the pushing piece 133 and the workpiece 200. It can be understood that in other embodiments, the rotating handle 1343 can also be arranged to realize the positioning of the small piece 300 when it is rotated counterclockwise, and to realize the separation of the pushing piece 133 and the workpiece 200 when it is rotated clockwise.

[0057] In order to improve the rotating efficiency of the rotating shaft 1341 relative to the mounting piece 131, the rotating piece 134 further comprises a bearing 1344. The bearing 1344 is sleeved on the rotating shaft 1341 and is mounted on the mounting piece 131.

[0058] Please refer to Figure 3 and Figure 4 In some embodiments, the mounting piece 131 comprises a mounting body 1311 and a fixing body 1312. The mounting body 1311 is connected with the bearing seat 110 and is provided with a mounting groove 1311a, the gear 1342 is accommodated in the mounting groove 1311a, the fixing body 1312 is connected with the mounting body 1311 and is provided with a movable through hole 1312a which communicates with the mounting groove 1311a, and the pushing piece 133 is movably arranged in the movable through hole 1312a and the mounting groove 1311a.

[0059] In the embodiment, the two installation grooves 1311a, the two fixing bodies 1312, the two pushing members 133 and the two gears 1342 are one-to-one corresponding respectively. Therefore, the workpiece 200 can be pushed from two positions, which is beneficial to improve the stability of the position between the workpiece 200 and the small workpiece 300.

[0060] In some embodiments, the pushing member 133 comprises a pushing body 1331 and a stop body 1332. The pushing body 1331 is movably inserted into the movable through hole 1312a and the installation groove 1311a, and one end of the pushing body 1331 is used for pushing the workpiece 200. A plurality of gear grooves 133a are arranged on the side of the pushing body 1331 facing the gear 1342. The stop body 1332 is connected to the pushing body 1331 and located on the side of the installation groove 1311a away from the movable through hole 1312a, and is used for pushing the installation body 1311 to limit the movement range of the pushing body 1331.

[0061] Therefore, the movement range of the pushing body 1331 relative to the installation body 1311 can be limited by the stop body 1332.

[0062] For example, the pushing body 1331 and the stop body 1332 are an integral structure, so as to simplify the processing process of the pushing member 133.

[0063] Please refer to Figure 4 In some embodiments, the positioning member 132 comprises a turnover shaft 1321, a linkage body 1322 and a positioning body 1323. The turnover shaft 1321 movably penetrates the installation member 131. The linkage body 1322 is connected to the turnover shaft 1321. The positioning body 1323 is detachably connected to the linkage body 1322, and the positioning body 1323 comprises a positioning portion 1323a.

[0064] In the embodiment, the linkage body 1322 and the positioning body 1323 are both two, and the two linkage bodies 1322 are respectively sleeved on the turnover shaft 1321 and are spaced apart.

[0065] For example, the linkage body 1322 comprises a horizontal portion 1322a and a vertical portion 1322b. One end of the horizontal portion 1322a is sleeved on the turnover shaft 1321, and the other end of the horizontal portion 1322a is detachably connected to the positioning body 1323. The vertical portion 1322b is connected to the horizontal portion 1322a perpendicularly. The positioning member 132 can be rotated by pushing the vertical portion 1322b, which is beneficial to improve the convenience of turning over the positioning member 132.

[0066] Please refer to Figure 3 and Figure 4In some embodiments, the positioning body 1323 further comprises a dismounting portion 1323b and a protruding portion 1323c. One end of the dismounting portion 1323b is detachably connected with the linkage body 1322, the positioning portion 1323a is vertically connected with one end of the dismounting portion 1323b away from the linkage body 1322, the protruding portion 1323c is connected with the positioning portion 1323a and encloses the dismounting portion 1323b and the positioning portion 1323a to form a limiting slot 1323d, and the limiting slot 1323d is used for limiting the small piece 300.

[0067] Therefore, the limiting slot 1323d can limit the small piece 300, avoid the small piece 300 from deviating from the welding position 200b during the welding process, and be beneficial to improving the positioning stability of the small piece 300 relative to the welding position 200b.

[0068] For example, the protruding portion 1323c is vertically connected with the positioning portion 1323a and is parallel to the dismounting portion 1323b.

[0069] Please refer to Figure 2 and Figure 5 In some embodiments, the clamping piece 122 comprises a base block 1221, a clamping body 1222 and an elastic body 1223. The base block 1221 is arranged on the bearing seat 110, one end of the clamping body 1222 is rotationally connected with the base block 1221, the other end of the clamping body 1222 is used for stopping the pressing piece 121, and the two ends of the elastic body 1223 are respectively abutted against the base block 1221 and the clamping body 1222. For example, the elastic body 1223 is a spring.

[0070] In this embodiment, the base block 1221 comprises a main body portion 1221a and an extension portion 1221b, the main body portion 1221a is provided with an elastic slot 1221c, the extension portion 1221b is vertically connected with the main body portion 1221a and is located at the periphery of the elastic slot 1221c, the clamping body 1222 comprises a rotating column 1222a, a clamping block 1222b and a bent portion 1222c, the rotating column 1222a is accommodated in the elastic slot 1221c, and the two ends of the rotating column 1222a are respectively inserted into the opposite two side walls of the elastic slot 1221c, one end of the clamping block 1222b is movably sleeved on the rotating column 1222a, the bent portion 1222c is connected with the other end of the clamping block 1222b and is located on the side of the clamping block 1222b away from the extension portion 1221b, the side of the bent portion 1222c away from the clamping block 1222b is provided with a guide inclined surface 1222d, the guide inclined surface 1222d is used for guiding the pressing piece 121 to the lower side of the bent portion 1222c, so that the pressing piece 121 is stopped by the bent portion 1222c, and the two ends of the elastic body 1223 are respectively elastically abutted against the extension portion 1221b and the clamping block 1222b. For example, the clamping block 1222b and the bent portion 1222c are an integral structure.

[0071] Exemplarily, the main body 1221a is connected to the bearing seat 110 through the clamping screw 1224.

[0072] Please refer to Figure 2 In some embodiments, the pressing member 121 comprises a turnover body 1211, a pressing handle 1212 and a flexible body 1213. One end of the turnover body 1211 is rotationally connected to the bearing seat 110, the clamping member 122 is used to stop the other end of the turnover body 1211, the pressing handle 1212 is connected to the turnover body 1211 for driving the turnover body 1211 to rotate, and the flexible body 1213 is connected to the side of the turnover body 1211 away from the pressing handle 1212 for flexibly abutting against the workpiece 200. Wherein, the flexible body 1213 can be set with a specific number and position based on the structure of the workpiece 200. Exemplarily, the flexible body 1213 is two, and the two flexible bodies 1213 are spaced apart in the direction away from the mounting member 131.

[0073] Therefore, the damage to the workpiece 200 during the pressing of the workpiece 200 can be avoided through the flexible body 1213.

[0074] Please refer to Figure 2 and Figure 6 In some embodiments, the bearing seat 110 comprises a bottom plate 111, a support frame 112 and a bearing member 113. The support frame 112 is arranged on the bottom plate 111 and is provided with a support inclined surface 112a relative to the bottom plate 111, the bearing member 113 is arranged on the support inclined surface 112a, the pressing member 121 is rotationally connected to the bearing member 113, and the clamping member 122 and the mounting member 131 are both arranged on the bearing member 113.

[0075] Therefore, the workpiece 200 can be placed in an inclined state after being placed on the bearing member 113, so that the small piece 300 can be tightly attached to the side wall of the welding groove 200a under the action of its own gravity after being placed on the welding site 200b.

[0076] In the embodiment, the bearing member 113 is provided with a bearing site 113a, the bearing seat 110 further comprises a plurality of positioning rods 114 and a plurality of positioning columns 115, the plurality of positioning columns 115 are both connected to the bearing member 113 and arranged on the bearing site 113a for being inserted into the workpiece 200, and the plurality of positioning rods 114 are both connected to the bearing member 113 and spaced apart around the bearing site 113a along the bearing site 113a. Therefore, the accuracy of the positioning of the workpiece 200 can be improved through the plurality of positioning rods 114 and the plurality of positioning columns 115.

[0077] Please refer to Figure 7 The utility model embodiment further provides a welding device 1000 for welding the workpiece 200 and the small piece 300, comprising a positioning mechanism 100 and a welding mechanism 400, the welding mechanism 400 is arranged adjacent to the positioning mechanism 100, and is used for welding the small piece 300 to the workpiece 200 when the workpiece 200 abuts against the small piece 300 to the positioning part 1323a.

[0078] The working process of the welding device 1000 is as follows:

[0079] Firstly, the pressing member 121 is flipped by the pressing handle 1212 to be separated from the clamping member 122, at this time, the bearing position 113a is in an open state, the positioning member 1323 is rotated by the linkage body 1322 to make the positioning part 1323a away from the bearing position 113a, and the pushing member 1331 is away from the bearing position 113a by rotating the rotating handle 1343 through the gear 1342;

[0080] Secondly, the workpiece 200 is placed on the bearing position 113a, and the small piece 300 is placed on the welding position 200b in the workpiece 200;

[0081] Then, the pressing member 121 is flipped by the pressing handle 1212 to make the flipping body 1211 be stopped by the bending part 1222c of the clamping member 122, at this time, the flexible body 1213 presses the workpiece 200;

[0082] Subsequently, the positioning member 1323 is rotated by the linkage body 1322 to make the positioning part 1323a extend into the welding groove 200a and be located on the side of the small piece 300 away from the welding position 200b;

[0083] Then, the pushing member 1331 is pushed to the workpiece 200 by rotating the rotating handle 1343 through the gear 1342, so that the workpiece 200 is pushed to the small piece 300 to the positioning part 1323a;

[0084] Finally, the rotating handle 1343 is fixed, and the part of the small piece 300 not blocked by the positioning part 1323a is welded by the welding mechanism 400, so as to realize the welding of the small piece 300 and the workpiece 200.

[0085] Therefore, the positioning mechanism 100 and the welding device 1000 can fix the position of the small piece 300 relative to the workpiece 200 during welding, which is beneficial to improve the welding quality of the small piece 300 and the workpiece 200.

[0086] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalent elements of the claims are intended to be embraced therein.

[0087] Finally, it should be noted that the above examples are intended to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the present application.

Claims

1. A positioning mechanism for positioning a workpiece and a small piece, the workpiece being provided with a welding groove, a side wall of the welding groove being provided with a welding site for placing the small piece, characterized in that, The positioning mechanism comprises: a bearing seat for bearing the workpiece; a pressing assembly comprising a pressing member and a clamping member, the clamping member is arranged on the bearing seat, and the pressing member is rotatably connected to the bearing seat and is used for clamping cooperation with the clamping member to press the workpiece to the bearing seat; a positioning assembly comprising a mounting member, a positioning member, a pushing member and a rotating member, the mounting member is arranged on the bearing seat, the positioning member is rotatably connected to the mounting member and comprises a positioning portion, when the small workpiece is arranged at the welding position, the positioning portion is used for extending into the welding groove and is located at the side of the small workpiece away from the welding position, the pushing member is movably arranged on the mounting member, the rotating member is rotatably connected to the mounting member and is in gear slot cooperation with the pushing member, and the rotating member is used for driving the pushing member to push the workpiece, so that the workpiece pushes the small workpiece to the positioning portion.

2. The positioning mechanism of claim 1, wherein, One side surface of the pushing member is provided with a plurality of gear slots which are arranged at intervals along the movement direction of the pushing member, and the rotating member comprises: a rotating shaft movably penetrating the mounting member; a gear wheel which is sleeved and fixed on the rotating shaft and is in meshing cooperation with the plurality of gear slots; a rotating handle connected to the rotating shaft, used for driving the gear wheel to rotate through the rotating shaft, when the gear wheel rotates, the pushing member is driven to push the workpiece so that the workpiece pushes the small workpiece to the positioning portion, or the pushing member is driven to move away from the workpiece.

3. The positioning mechanism of claim 2, wherein The mounting member comprises: a mounting body connected to the bearing seat and provided with a mounting groove, and the gear wheel is accommodated in the mounting groove; a fixed body connected to the mounting body and provided with a movable through hole communicating with the mounting groove, and the pushing member is movably inserted into the movable through hole and the mounting groove.

4. The positioning mechanism of claim 3, wherein The pushing member comprises: a pushing body movably inserted into the movable through hole and the mounting groove, and one end of the pushing body is used for pushing the workpiece, and the plurality of gear slots are arranged on the side of the pushing body facing the gear wheel; a stop body connected to the pushing body and located at the side of the mounting groove away from the movable through hole, used for pushing the mounting body to limit the pushing body.

5. The positioning mechanism of claim 1, wherein The positioning member comprises: a turnover shaft movably penetrating the mounting member; a linkage body connected to the turnover shaft; a positioning body detachably connected to the linkage body and comprising the positioning portion.

6. The positioning mechanism of claim 5, wherein The positioning body further comprises: a dismounting portion, one end of the dismounting portion is detachably connected to the linkage body, and the positioning portion is perpendicularly connected to the end of the dismounting portion away from the linkage body; a protruding portion connected to the positioning portion and surrounding the dismounting portion and the positioning portion to form a limiting groove, and the limiting groove is used for limiting the small workpiece.

7. The positioning mechanism of claim 1, wherein The clamping member comprises: a base block arranged on the bearing seat; a clamping body, one end of the clamping body is rotatably connected to the base block, and the other end of the clamping body is used for stopping the pressing member; a resilient body, both ends of the resilient body are respectively pushed against the base block and the clamping body.

8. The positioning mechanism of claim 1, wherein, The pressing member comprises: a turnover body, one end of the turnover body is rotatably connected to the bearing seat, and the clamping member is used for stopping the other end of the turnover body; a pressing handle connected to the turnover body, used for driving the turnover body to rotate; A flexible body is connected to the side of the turnover body away from the pressing handle, and is used for flexibly abutting against the workpiece.

9. The positioning mechanism of claim 1, wherein, The bearing seat comprises: a bottom plate; a support frame provided on the bottom plate and provided with a support slope opposite to the bottom plate; a bearing member provided on the support slope, the pressing member is rotationally connected with the bearing member, and the clamping member and the mounting member are both provided on the bearing member.

10. A welding device for welding workpieces and small parts, characterized in that comprises: the positioning mechanism according to any one of claims 1 to 9; a welding mechanism provided adjacent to the positioning mechanism, and used for welding the small piece to the workpiece when the workpiece abuts against the small piece to the positioning portion.

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