Laser welding device for electric tool accessories

Abstract

The present application relates to a laser welding device for electric tool accessories, belonging to the technical field of welding equipment, which includes: a positioning tool for positioning and clamping a driving connecting rod; a rotating driving assembly for driving the positioning tool to rotate so as to weld different positions of the driving connecting rod; a three-axis cantilever module welding mechanism, including a laser welding gun head located above the positioning tool, a cantilever linear module for driving the laser welding gun head to move in the front-back direction, a vertical linear module for driving the cantilever linear module to move in the vertical direction, and a horizontal linear module for driving the vertical linear module to move in the left-right direction; the positioning tool includes a base plate for placing the driving connecting rod, a clamping assembly for clamping and positioning the driving connecting rod in cooperation with the base plate, an abutment block at one end of the driving connecting rod in the horizontal length direction, and a clamping adjustment assembly for clamping the driving connecting rod at the other end of the driving connecting rod in the horizontal length direction. The present application has the effect of improving the welding quality when welding electric tool accessories.

Description

Technical Field

[0001] The present application relates to the technical field of welding equipment, and in particular to a laser welding device for electric tool accessories. Background Art

[0002] The driving connecting rod is an important accessory in electric tools. It is mainly used to connect the driving connecting rod of electric tools and mainly includes a cylindrical rod and a driving connecting plate. A slot with a length of 1 cm is opened at one end of the cylindrical rod. The slot penetrates the cylindrical rod itself in two opposite directions along the radial direction of the cylindrical rod. One side of the driving connecting plate is inserted into the slot, and the opposite sides of the driving connecting plate protrude from the slot along the direction in which the slot penetrates the cylindrical rod and are exposed to the outside. When welding and fixing the cylindrical rod and the driving connecting plate, the staff uses a laser welding gun to weld the two sides of the driving connecting plate protruding from the slot.

[0003] In the related technology, the staff will clamp the cylindrical rod on the vise in the vertical direction, then insert the driving connecting plate into the slot, and finally weld the driving connecting plate by hand with the welding gun of the laser welding machine. However, due to the short length of the slot, it is difficult for the staff to accurately control the welding length during the welding process, and it is easy to weld the welding wire at the rest of the cylindrical rod due to the long welding length, resulting in low welding accuracy, which leads to uneven welding quality of driving connecting rods in the same batch. Summary of the invention

[0004] In order to improve the welding quality when welding power tool accessories, the present application provides a laser welding device for power tool accessories.

[0005] The present application provides a laser welding device for electric tool accessories, which adopts the following technical solution:

[0006] A laser welding device for electric tool accessories, comprising:

[0007] Positioning fixture, for horizontal placement of the driving connecting rod and positioning and clamping the driving connecting rod;

[0008] A rotation drive assembly, located on one side of the positioning fixture, is used to drive the positioning fixture to rotate so as to perform welding on different positions of the driving connecting rod;

[0009] A three-axis cantilever module welding mechanism, comprising a laser welding gun head located above the positioning fixture, a cantilever linear module driving the laser welding gun head to move in the front-rear direction, a vertical linear module driving the cantilever linear module to move in the vertical direction, and a horizontal linear module driving the vertical linear module to move in the left-right direction;

[0010] The positioning tooling includes a base plate for placing the driving connecting rod, a clamping assembly that cooperates with the base plate to clamp and position the driving connecting rod, an abutment block located at one end of the driving connecting rod in the horizontal length direction for the driving connecting rod to abut, and a clamping adjustment assembly located at the end of the driving connecting rod in the horizontal length direction away from the abutment block for clamping the driving connecting rod.

[0011] Preferably, a lower positioning clamping block is provided on the top of the substrate, and the lower positioning clamping block is located below the clamping assembly. A lower positioning clamping groove is opened on the top of the lower positioning clamping block for the middle part of the cylindrical rod to be placed therein, and one side of the cylindrical rod close to the clamping assembly protrudes out of the lower positioning clamping groove, and the clamping assembly presses the cylindrical rod to limit its position in the lower positioning clamping groove.

[0012] Preferably, the clamping assembly includes an overhanging plate, an upper positioning clamping block and a driving spring, one side of the overhanging plate is installed on the base plate, and the other side is located above the lower positioning clamping block and is in a cantilevered state, a square column is provided on the portion of the overhanging plate located above the lower positioning clamping block, the square column extends in a direction close to the lower positioning clamping block, the upper positioning clamping block is sleeved on the square column and slides directionally on the square column to clamp or release the cylindrical rod, and the driving spring is sleeved on the square column to drive the upper positioning clamping block to always have a tendency to move close to the lower positioning clamping block.

[0013] Preferably, the clamping adjustment assembly includes a fixed block located at the end of the driving connecting plate away from the cylindrical rod, a threaded driving column threadedly mounted on the fixed block, and a clamping push rod fixedly mounted on the threaded driving column at one end close to the driving connecting plate, the clamping push rod passes through the fixed block and abuts against the driving connecting plate, and the length direction of the driving connecting rod is clamped and limited by the abutting block and the clamping push rod.

[0014] Preferably, a clamping linkage assembly is provided on the base plate; when the driving connecting rod is not clamped and limited by the abutment block and the clamping top rod, the upper positioning clamping block can be spaced apart from the lower positioning clamping block through the clamping linkage assembly to allow a cylindrical rod to be placed in the lower positioning clamping groove;

[0015] When the threaded driving column is rotated to allow the abutment block and the clamping push rod to clamp the driving connecting rod to a limited position, the upper positioning clamping block can automatically descend through the clamping linkage assembly and press the cylindrical rod to a limited position in the lower positioning clamping groove.

[0016] Preferably, the clamping linkage assembly comprises a linkage sliding block located at one side of the lower positioning clamping block, the linkage sliding block is slidably installed on the base plate, an inclined surface is provided on the side of the linkage sliding block away from the base plate, a downward pressing inclined surface abutting against the inclined surface is provided at the bottom of one side of the upper positioning clamping block, a clamping strip is provided on the downward pressing inclined surface, and a clamping groove for the clamping strip to be clamped into is provided on the inclined surface;

[0017] The clamping linkage assembly also includes a linkage sleeve and a linkage connecting rod. A through hole for inserting the linkage sleeve is provided on a side of the abutment block close to the cylindrical rod. An extension guide column is connected to a side of the abutment block away from the cylindrical rod. The linkage sleeve is sleeved on the extension guide column and slides on the extension guide column. The linkage connecting rod is used to connect the linkage sleeve and the linkage sliding block. The linkage sleeve moves synchronously with the linkage sliding block.

[0018] When the cylindrical rod is not pressed against the abutment block, the clamping strip is clamped in the clamping groove, and there is a clearance gap d between the upper positioning clamping block and the lower positioning clamping block for the cylindrical rod to be placed in the lower positioning clamping groove. At this time, the end of the linkage sleeve close to the cylindrical rod protrudes from the through hole and is located on the side of the abutment block close to the cylindrical rod;

[0019] When the cylindrical rod is pressed against the abutment block, the part of the linkage sleeve protruding from the through hole is completely pushed into the through hole, and the linkage sliding block will move synchronously with the linkage sleeve, so that the clamping strip is disengaged from the clamping groove. At this time, the linkage sliding block will continue to move and make way under the action of the driving spring and the upper positioning clamping block until the upper positioning clamping block is pressed against the cylindrical rod.

[0020] Preferably, it also includes an error adjustment component that can drive the base plate and the driving connecting rod to move when the threaded driving column is rotated, thereby offsetting the error of the cylindrical rod length during welding;

[0021] The positioning fixture further comprises a rotating plate, the rotating plate is driven by the rotating drive assembly to rotate, the base plate is slidably mounted on the rotating plate, and the base plate rotates synchronously with the rotating plate, and the sliding direction of the base plate is consistent with the length direction of the driving connecting rod;

[0022] The error adjustment component is partially rotatably mounted on the rotating plate to drive the substrate to move, and is partially mounted on the clamping mandrel to move synchronously with the clamping mandrel;

[0023] When the error of the cylindrical rod is a negative number, the error adjustment assembly drives the base plate to drive the driving connecting rod to move from the initial position toward the fixed block by a distance equal to the negative number during the process of the clamping push rod clamping the driving connecting rod;

[0024] When the error of the cylindrical rod is a positive number, during the process of the clamping push rod clamping the driving connecting rod, the error adjustment component drives the base plate to drive the driving connecting rod to move from the initial position in a direction away from the fixed block by a distance equal to the positive number.

[0025] Preferably, the error adjustment assembly includes a rotating column, the rotating column is located between the base plate and the fixed block, the rotating column is rotatably mounted on the rotating plate, a linkage driving column is fixedly mounted on a side of the base plate close to the rotating column, and an eccentric driving groove is provided on the rotating column for the linkage driving column to be inserted to drive the base plate to move;

[0026] As the rotating column rotates, the base plate first moves in a direction away from the rotating column, and then moves in a direction close to the rotating column until the driving connecting rod is clamped.

[0027] Preferably, the error adjustment assembly also includes a gear that rotates synchronously with the rotating column and a rack that meshes with the gear to drive the gear to rotate, a rotating sleeve is sleeved on the clamping top rod, the rotating sleeve is rotatably installed on the clamping top rod, and the rotating sleeve moves synchronously with the clamping top rod, the rack is connected to the rotating sleeve, and the rack moves synchronously with the rotating sleeve.

[0028] Preferably, the rotating sleeve is connected to a limit strip, and the fixed block is provided with a limit slot for the limit strip to be inserted and slide.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] The driving connecting rod is placed on the positioning fixture and clamped in position. Then the rotating driving assembly drives the positioning fixture to rotate. The three-axis cantilever module welding mechanism drives the laser welding gun head to move to the position where the welding machine is required for welding. Since there are four positions on the driving connecting rod for welding, the rotating driving assembly can drive the positioning fixture to drive the driving connecting rod to rotate a specific angle each time it is welded to cooperate with the three-axis cantilever module welding mechanism to complete the welding. The entire welding process is controlled by a computer program. The distance that the laser welding gun head moves for welding each time is a fixed value, and it is not easy to exceed the required welding distance during welding to affect the parts, thereby improving the quality of welding the workpiece;

[0031] The cylindrical rod in the driving connecting rod may have errors during the processing due to old processing equipment. When the threaded driving column is rotated to clamp the clamping top rod to the driving connecting rod, the base plate will first move away from the fixed block under the action of the error adjustment component, and then move towards the fixed block. During this process, if the error of the cylindrical rod is a negative number, the base plate will drive the driving connecting rod to move from the initial position to the direction close to the fixed block by a distance equal to the negative value. If the error of the cylindrical rod is a positive number, the base plate will drive the driving connecting rod to move towards the fixed block by a distance equal to the positive value of the initial position of the base plate. As a result, the driving connecting rod can be welded from the end of the welding point even if there is an error in the cylindrical rod, thereby ensuring the welding quality of this batch of driving connecting rods.

[0032] When clamping and positioning the driving connecting rod, it is only necessary to place the driving connecting rod on the base plate and then rotate the threaded driving column. During this process, the part of the linkage sleeve protruding from the through hole is completely pushed into the through hole, and the linkage sliding block will move synchronously with the linkage sleeve, so that the clamping strip is disengaged from the clamping groove. At this time, the linkage sliding block will continue to move and make way under the action of the driving spring and the lower positioning clamping block until the lower positioning clamping block is pressed against the cylindrical rod, thereby making it more convenient to install the driving connecting rod on the positioning tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of the driving connecting rod of the electric tool accessory in the embodiment of the present application.

[0034] Figure 2 It is an exploded schematic diagram of the driving connecting rod of the electric tool accessory in the embodiment of the present application.

[0035] Figure 3 It is a schematic diagram of the overall structure of the laser welding device in the embodiment of the present application.

[0036] Figure 4 It is a schematic diagram of the state when the positioning tooling clamps the driving connecting rod in the embodiment of the present application.

[0037] Figure 5 It is a schematic diagram of the state when the positioning tool does not clamp the driving connecting rod in the embodiment of the present application.

[0038] Figure 6 It is an exploded schematic diagram of the clamping linkage assembly in the embodiment of the present application.

[0039] Figure 7 It is an exploded schematic diagram of the rotating plate and the base plate in the embodiment of the present application.

[0040] Figure 8 It is a schematic diagram of the coordination structure of the rotating plate, the base plate, the clamping adjustment component and the error adjustment component in the embodiment of the present application.

[0041] Fig. 9 It is a schematic diagram of the coordination structure of the clamping adjustment component and the error adjustment component in the embodiment of the present application.

[0042] 1. Base plate; 2. Positioning fixture; 21. Rotating plate; 211. Dovetail groove; 212. Fixed column; 22. Base plate; 221. Dovetail strip; 222. Linkage drive column; 23. Clamping assembly; 231. Overhanging plate; 232. Upper positioning clamping block; 2321. Lower pressing inclined surface; 2322. Snap-on strip; 233. Drive spring; 234. Square column; 24. Abutment block; 241. Through hole; 25. Clamping adjustment assembly; 251. Fixed block; 2511. Limiting through groove; 252. Threaded drive column; 253. Clamping ejector rod; 26. Lower positioning clamping block; 261. Lower positioning clamping groove; 3. Clamping linkage assembly; 31. Linkage sliding block; 311. Inclined surface; 3111. Snap-on groove; 32. Linkage sleeve; 33. Extension Extension guide column; 34, linkage connecting rod; 35, extension plate; 36, auxiliary reset spring; 37, guide column; 4, error adjustment assembly; 41, rotating column; 411, eccentric drive slot; 412, drive away slot; 413, drive close slot; 42, gear; 43, rack; 44, rotating sleeve; 45, limit strip; 46, connecting column; 47, limit ring; 5, rotary drive assembly; 51, reduction motor group; 52, three-jaw chuck; 53, rotating support seat; 6, three-axis cantilever module welding mechanism; 61, laser welding gun head; 62, cantilever linear module; 63, vertical linear module; 64, horizontal linear module; 7, driving connecting rod; 71, cylindrical rod; 711, slot; 712, docking slot; 72, driving connecting plate; 721, docking column. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1-9 This application is described in further detail.

[0044] Reference Figure 1 and Figure 2The electric tool accessory is a driving connecting rod 7, which mainly includes a cylindrical rod 71 and a driving connecting plate 72. A slot 711 with a length of 1 cm is provided at one end of the cylindrical rod 71, and the slot 711 penetrates the cylindrical rod 71 itself along two radially opposite directions of the cylindrical rod 71. A docking slot 712 is provided at the bottom of the slot 711, and a docking column 721 is formed integrally at one end of the driving connecting plate 72 close to the cylindrical rod 71, which is inserted into the driving connecting plate 72 and protrudes from the docking slots 712 on both sides of the slot 711. One side of the driving connecting plate 72 provided with the docking column 721 is inserted into the slot 711, and the opposite sides of the driving connecting plate 72 protrude from the slot 711 along the direction in which the slot 711 penetrates the cylindrical rod 71 and are exposed to the outside. When welding, it is necessary to weld the two sides of the driving connecting plate 72 protruding from the slot 711, that is, weld the four places where the driving connecting plate 72 protrudes from the two sides of the slot 711 and is perpendicular to the cylindrical rod 71. The axial direction of the cylindrical rod 71 is assumed to be the length direction of the driving connecting rod 7 .

[0045] The present application embodiment discloses a laser welding device for electric tool accessories. Figure 3 and Figure 4 The laser welding device for electric tool accessories includes a base plate 1, a positioning fixture 2, a clamping linkage component 3, an error adjustment component 4, a rotation drive component 5 and a three-axis cantilever module welding mechanism 6. The driving connecting rod is installed on the positioning fixture 2 and is clamped and limited. The clamping linkage component 3 is installed on the positioning fixture 2, so that the driving connecting rod has a linkage effect when it is clamped, thereby improving the convenience of installing the driving connecting rod. The error adjustment component 4 is also installed on the positioning fixture 2. Through the error adjustment component 4, the error formed during the processing of the cylindrical rod can be adaptively adjusted during the welding process, so that the driving connecting rods in the same batch will be welded from the same welding starting point even if there are errors, thereby improving the welding quality. The rotation drive component 5 and the three-axis cantilever module welding mechanism 6 are both installed on the base plate 1. The rotation drive component 5 is used to drive the positioning fixture 2 to rotate, so that the three-axis cantilever module welding mechanism 6 welds the four positions that need to be welded.

[0046] Reference Figure 4 and Figure 5The positioning fixture 2 includes a rotating plate 21, a base plate 22, a clamping assembly 23, an abutment block 24 and a clamping adjustment assembly 25. The base plate 22 is slidably mounted on the rotating plate 21. The base plate 22 can slide on the rotating plate 21 through the drive of the error adjustment assembly 4. The rotating plate 21 is connected to the rotation drive assembly 5 to realize rotation, and the base plate 22 rotates synchronously with the rotating plate 21. The clamping assembly 23 and the abutment block 24 are both mounted on the base plate 22 and move synchronously with the base plate 22. The clamping adjustment assembly 25 is mounted on the rotating plate 21, and the clamping adjustment assembly 25 and the abutment block 24 are arranged at intervals. After the driving connecting rod is placed on the base plate 22, the clamping adjustment assembly 25 drives the driving connecting rod to move in the direction close to the abutment block 24, and the clamping adjustment assembly 25 cooperates with the abutment block 24 to clamp the driving connecting rod in the length direction (i.e., the axial direction of the cylindrical rod). The clamping assembly 23 will move towards the base plate 22 under the action of the clamping linkage assembly 3 to press the driving connecting rod onto the base plate 22 .

[0047] Reference Figure 4 and Figure 5 The lower positioning clamping block 26 is welded on the side of the base plate 22 away from the rotating plate 21. The lower positioning clamping block 26 has a lower positioning clamping groove 261 on the top (the side away from the base plate 22). The lower positioning clamping groove 261 penetrates the lower positioning clamping block 26 along the length direction of the driving connecting rod. The cylindrical rod will be placed in the lower positioning clamping groove 261, and both ends of the cylindrical rod axially protrude from the lower positioning clamping groove 261, and the side of the cylindrical rod away from the base plate 22 also protrudes from the lower positioning clamping groove 261, so that when the clamping adjustment component 25 and the abutment block 24 clamp the driving connecting rod in the length direction, the clamping component 23 can press the cylindrical rod into the lower positioning clamping groove 261. The driving connecting plate is a plate body, so the plane of the driving connecting rod close to the base plate 22 can be directly placed on the base plate 22, so that the cylindrical rod will not rotate in the circumferential direction after being placed in the lower positioning clamping groove 261.

[0048] Reference Figure 4 and Figure 5The clamping assembly 23 includes an overhanging plate 231, an upper positioning clamping block 232, and a driving spring 233. The overhanging plate 231 is a plate body in the shape of a number "7". One side of the overhanging plate 231 is mounted on the base plate 22, and the other side is located above the lower positioning clamping block 26 in an overhanging state. A square column 234 is welded to the portion of the overhanging plate 231 located above the lower positioning clamping block 26. The square column 234 extends in a direction close to the lower positioning clamping block 26. The upper positioning clamping block 232 is sleeved on the square column 234 and can slide in a directional manner on the square column 234 to clamp or release the cylindrical rod. The driving spring 233 is sleeved on the square column 234, and one end of the driving spring 233 abuts against the part of the overhanging plate 231 located above the lower positioning clamping block 26; the other end abuts against the side of the upper positioning clamping block 232 away from the lower positioning clamping block 26, so that the upper positioning clamping block 232 can have a tendency to move closer to the lower positioning clamping block 26 under the driving spring 233, so that the cylindrical rod can be clamped and limited in the lower positioning clamping groove 261.

[0049] The upper positioning clamping block 232 is provided with an arc-shaped groove that matches the cylindrical rod on one side close to the lower positioning clamping block 26. When the cylindrical rod is clamped, the contact area between the cylindrical rod and the upper positioning clamping block 232 is larger, and the cylindrical rod is clamped more stably. In order to prevent the upper positioning clamping block 232 from scratching the surface of the cylindrical rod when it falls and presses the cylindrical rod, an arc-shaped rubber buffer gasket is installed in the arc-shaped groove.

[0050] The abutment block 24 is located at the end of the base plate 22 close to the cylindrical rod, and the abutment block 24 is fixed to the base plate 22 by bolts. The end of the cylindrical rod away from the driving connecting plate will abut against the abutment block 24.

[0051] Reference Figure 4 and Figure 5 The clamping and adjusting assembly 25 includes a fixed block 251, a threaded driving column 252 and a clamping push rod 253. The fixed block 251 is located on the side of the base plate 22 away from the abutment plate, and the fixed block 251 and the base plate 22 are arranged at intervals. A threaded hole penetrating the fixed block 251 is provided on the side of the fixed block 251 close to the base plate 22, and the threaded driving column 252 is inserted into the threaded hole and installed on the fixed block 251. The clamping push rod 253 is located at one end of the threaded driving column 252 close to the base plate 22, and one end of the clamping push rod 253 away from the threaded driving column 252 protrudes from the threaded hole and abuts against one end of the driving connecting plate away from the cylindrical rod. The clamping push rod 253 is integrally formed with the threaded driving column 252, and then as the threaded driving column 252 rotates, the clamping push rod 253 can cooperate with the abutment block 24 to clamp or loosen the driving connecting rod.

[0052] Combination Figure 4 Reference Figure 5 and Figure 6The clamping linkage assembly 3 is slidably mounted on the base plate 22 and is used to realize linkage control with the clamping top rod 253 to drop the upper positioning clamping block 232 to press the cylindrical rod. When the driving connecting rod is not clamped and limited by the abutment block 24 and the clamping top rod 253, the upper positioning clamping block 232 can be separated from the lower positioning clamping block 26 by the clamping linkage assembly 3 to allow the cylindrical rod to be placed in the lower positioning clamping groove 261; when the threaded driving column 252 is rotated to allow the abutment block 24 and the clamping top rod 253 to clamp the driving connecting rod, the upper positioning clamping block 232 can automatically drop through the clamping linkage assembly 3 and press the cylindrical rod to the lower positioning clamping groove 261.

[0053] Combination Figure 4 Reference Figure 5 and Figure 6 The clamping linkage assembly 3 includes a linkage sliding block 31, a linkage sleeve 32, an extension guide column 33 and a linkage connecting rod 34. The linkage sliding block 31 is located on one side of the lower positioning clamping block 26, and the linkage sliding block 31 is located below the upper positioning clamping block 232. The linkage sliding block 31 can support the upper positioning clamping block 232 so that the length of the driving connecting rod is not easy to fall automatically when the upper positioning clamping block 232 is not clamped. A through hole 241 for inserting the linkage sleeve 32 is provided on the side of the abutment block 24 close to the cylindrical rod, and an L-shaped extension plate 35 is welded on the side of the abutment block 24 away from the cylindrical rod. The extension plate 35 extends in a direction away from the cylindrical rod. An extension guide column 33 is welded on the side of the extension plate 35 away from the abutment block 24. The extension guide column 33 is inserted into the through hole 241, but the end of the extension guide column 33 close to the cylindrical rod does not protrude from the through hole 241. The linkage sleeve 32 is sleeved on the extension guide post 33 and slides on the extension guide post 33. One side of the linkage connecting rod 34 is connected to the outer wall of the linkage sleeve 32; the other side is fixedly connected to the linkage sliding block 31, so that the linkage sleeve 32 can move synchronously with the linkage sliding block 31.

[0054] An auxiliary reset spring 36 is sleeved on the extended guide column 33. The auxiliary reset spring 36 is located on the side of the linkage sleeve 32 away from the abutment block 24. One end of the auxiliary reset spring 36 abuts against the linkage sleeve 32, and the other end abuts against the extension plate 35. Therefore, when the linkage sleeve 32 is reset after being driven to slide, the auxiliary reset spring 36 can apply an elastic force, making it easier and more convenient to reset the linkage sleeve 32 and the linkage sliding block 31.

[0055] A fixing plate is welded to one side of the positioning clamping block 26 provided on the base plate 22, and a guide column 37 is welded to the fixing plate. The linkage sliding block 31 is sleeved on the guide column 37 and can slide in a directional manner on the guide column 37. The side of the linkage sliding block 31 close to the base plate 22 abuts against the base plate 22, so that the linkage sliding block 31 is not easy to rotate when moving.

[0056] Combination Figure 4 Reference Figure 5 and Figure 6 The side of the linkage sliding block 31 facing away from the base plate 22 is provided with an inclined surface 311, and the inclined surface 311 gradually inclines toward the base plate 22 along the direction from the abutting block 24 to the fixing block 251. The bottom of one side of the upper positioning clamping block 232 is provided with a downward pressing inclined surface 2321 that fits with the inclined surface 311, and a clamping strip 2322 with a semicircular cross section is integrally formed on the downward pressing inclined surface 2321. A clamping groove 3111 for the clamping strip 2322 to be clamped is provided on the inclined surface 311, and the cross section of the clamping groove 3111 is also semicircular, so that the clamping strip 2322 can be easily dropped out of the clamping groove 3111.

[0057] When the cylindrical rod is not tightly against the abutment block 24, the clamping strip 2322 is clamped in the clamping groove 3111, and there is a gap between the upper positioning clamping block 232 and the lower positioning clamping block 26 for the cylindrical rod to be placed in the lower positioning clamping groove 261. At this time, the end of the linkage sleeve 32 close to the cylindrical rod protrudes out of the through hole 241 and is located on the side of the abutment block 24 close to the cylindrical rod; when the cylindrical rod is tightly against the abutment block 24, the part of the linkage sleeve 32 protruding from the through hole 241 is completely pushed into the through hole 241, and the linkage sliding block 31 will move synchronously with the linkage sleeve 32, so that the clamping strip 2322 is disengaged from the clamping groove 3111. At this time, the linkage sliding block 31 will continue to move and make way under the action of the driving spring 233 and the upper positioning clamping block 232 until the upper positioning clamping block 232 is tightly against the cylindrical rod.

[0058] Reference Figure 7 and Figure 8 The side of the base plate 22 close to the rotating plate 21 is integrally formed with a dovetail bar 221, and the extension direction of the dovetail bar 221 is consistent with the length direction of the driving connecting rod. The side of the rotating plate 21 close to the base plate 22 is provided with a dovetail groove 211 for the dovetail bar 221 to be inserted and slided. The side of the dovetail groove 211 close to the abutment block 24 penetrates the rotating plate 21, thereby facilitating the dovetail bar 221 to be inserted into the dovetail groove 211. The error adjustment component 4 will drive the base plate 22 to slide along the extension direction of the dovetail bar 221 as the clamping push rod 253 moves.

[0059] Reference Figure 8 and Fig. 9The error adjustment assembly 4 includes a rotating column 41, a gear 42, a rack 43, a rotating sleeve 44 and a limit bar 45. The rotating column 41 and the gear 42 are both located between the fixed block 251 and the base plate 22, and the rotating column 41 and the gear 42 share a rotating shaft. The rotating shafts of the rotating column 41 and the gear 42 are rotatably mounted on the rotating plate 21, and the rotating column 41 and the gear 42 rotate synchronously. The rotating sleeve 44 is also located between the fixed block 251 and the base plate 22. The rotating sleeve 44 is sleeved on the clamping top rod 253. The rotating sleeve 44 and the clamping top rod 253 can rotate relative to each other. A connecting column 46 is welded on the outer wall of the rotating sleeve 44. The connecting column 46 extends toward the direction of the rotating plate 21. The limit bar 45 is welded on the connecting column 46, and the rack 43 is welded on the limit bar 45. Two limiting ring pieces 47 are sleeved on the clamping top rod 253. The two limiting ring pieces 47 are respectively located at the two ends of the axial direction of the rotating sleeve 44, and the two limiting ring pieces 47 are welded to the clamping top rod 253, so that when the clamping top rod 253 moves, the rotating sleeve 44 and the rack 43 can move synchronously with the clamping top rod 253. The rack 43 and the gear 42 are meshed with each other. When the clamping top rod 253 clamps the driving connecting rod during the movement, the rack 43 rotates the driving gear 42, so that the rotating column 41 drives the base plate 22 to drive the driving connecting rod to move synchronously. It is worth noting that as the rotating column 41 rotates, the base plate 22 first moves away from the rotating column 41, and then moves toward the rotating column 41 until the driving connecting rod is clamped.

[0060] Among them, a limiting groove 2511 for the limiting bar 45 to be inserted and slide is opened on the side of the fixed block 251 close to the base plate 22, and the side of the limiting bar 45 away from the gear 42 will abut against the groove wall of the limiting groove 2511, and as the clamping top rod 253 moves, the side of the limiting bar 45 away from the base plate 22 is always abutted against the groove wall of the limiting groove, so that the rack 43 is not easy to rotate during the movement, thereby making the rack 43 more stable after meshing with the gear 42.

[0061] Reference Figure 8 and Fig. 9A linkage drive column 222 is welded on one side of the base plate 22 close to the rotating column 41. The linkage drive column 222 is a "7"-shaped round rod. An eccentric drive groove 411 is provided on the rotating column 41 for the linkage drive column 222 to be inserted to drive the base plate 22 to move. The eccentric drive groove 411 includes a drive away groove 412 and a drive approach groove 413. The drive away groove 412 gradually extends in a direction away from the central axis of the rotating column 41 along the circumference of the rotating column 41. The drive approach groove 413 is located at one end of the drive away groove 412 away from the central axis of the rotating column 41. The drive approach groove 413 is connected to the drive away groove 412, and the drive approach groove 413 gradually extends in a direction close to the central axis of the rotating column 41 along the circumference of the rotating column 41. The distance between the end of the drive approach groove 413 close to the central axis of the rotating column 41 and the central axis of the rotating column 41 is smaller than the distance between the end of the drive away groove 412 close to the central axis of the rotating column 41 and the central axis of the rotating column 41.

[0062] Reference Figure 8 and Fig. 9 When the base plate 22 is located at the initial position, the linkage drive column 222 is located at the end of the driving away groove 412 close to the central axis of the rotating column 41. When the error of the cylindrical rod is a negative number, the rack 43 drives the gear 42 and the rotating column 41 to rotate during the process of the clamping top rod 253 clamping the driving connecting rod. The linkage drive column 222 first drives the base plate 22 to drive the driving connecting rod to move away from the fixed block 251 under the action of the driving away groove 412. Then, the linkage drive column 222 moves back to the direction close to the fixed block 251 under the action of the driving approaching groove 413. In the process of the base plate 22 moving back to the direction close to the fixed block 251, the base plate 22 will move from the initial position to the direction close to the fixed block 251 by the same distance as the negative number, thereby offsetting the negative error value of the cylindrical rod.

[0063] When the error of the cylindrical rod is a positive number, in the process of clamping the driving connecting rod by the clamping top rod 253, the movable column first causes the substrate 22 to drive the driving connecting rod to move in the direction away from the fixed block 251 under the action of the driving away groove 412, and then the linkage driving column 222 moves back in the direction close to the fixed block 251 under the action of the driving approaching groove 413. In the process of the substrate 22 moving back to the fixed block 251, the substrate 22 cannot move to the initial position, and the substrate 22 will be separated from the initial position by the same positive distance, thereby offsetting the positive error value of the cylindrical rod.

[0064] Reference Figure 3 and Figure 4The rotary drive assembly 5 includes a reduction motor group 51, a three-jaw chuck 52 and a rotating support seat 53 installed on the base plate 1. The three-jaw chuck 52 is installed on the reduction motor group 51, and the three-jaw chuck 52 can rotate under the drive of the reduction motor group 51. The rotating plate 21 is located between the three-jaw chuck 52 and the rotating support seat 53, that is, the three-jaw chuck 52 and the rotating support seat 53 are located at both ends of the length direction of the driving connecting rod. The side of the rotating plate 21 close to the three-jaw chuck 52 and the side close to the rotating support seat 53 are fixedly installed with fixed columns 212, and the fixed columns 212 on the side of the rotating plate 21 close to the three-jaw chuck 52 are clamped by the claws on the three-jaw chuck 52; the fixed columns 212 on the side of the rotating plate 21 close to the rotating support seat 53 are inserted into the rotating support seat 53 and are rotatably connected with the rotating support seat 53. In this way, the three-jaw chuck 52 can drive the rotating plate 21 and the base plate 22 to drive the driving connecting rod to rotate.

[0065] Reference Figure 3 and Figure 4 The three-axis cantilever module welding mechanism 6 includes a laser welding gun head 61, a cantilever linear module 62, a vertical linear module 63 and a transverse linear module 64. The transverse linear module 64 is located on one side of the reduction motor group 51, and the transverse linear module 64 is installed on the bottom plate 1, and the extension direction of the transverse linear module 64 is consistent with the length direction of the driving connecting rod. The vertical linear module 63 is installed on the slider on the transverse linear module 64, and the transverse linear module 64 can drive the vertical linear module 63 to slide along the length direction of the driving connecting rod. The cantilever linear module 62 is installed on the slider of the vertical linear module 63, and the cantilever linear module 62 can move and lift in the vertical direction under the drive of the vertical linear module 63. The cantilever linear module 62 is located above the upper positioning clamping block 232, and the laser welding gun head 61 is installed on the slider on the cantilever linear module 62, and the laser welding gun head 61 can move in the front and rear direction under the drive of the cantilever linear module 62. That is, the cantilever linear module 62, the vertical linear module 63 and the horizontal linear module 64 form an XYZ three-axis linear module mechanism, which can drive the laser welding gun head 61 to move a specified length to complete the welding work.

[0066] The implementation principle of a laser welding device for an electric tool accessory in an embodiment of the present application is: when welding the driving connecting rod, the driving connecting rod is placed on the base plate 22 and the cylindrical rod is located in the lower positioning clamping groove 261, and then the threaded driving column 252 is screwed to drive the clamping top rod 253 to move and clamp the driving connecting rod on the abutment block 24.

[0067] When the driving clamping push rod 253 is moved to clamp the driving connecting rod, if the error of the cylindrical rod is a negative number, the rack 43 drives the gear 42 and the rotating column 41 to rotate during the process of the clamping push rod 253 clamping the driving connecting rod, and the linkage driving column 222 first drives the base plate 22 to drive the driving connecting rod to move in the direction away from the fixed block 251 under the action of the driving away groove 412, and then the linkage driving column 222 moves back in the direction close to the fixed block 251 under the action of the driving approaching groove 413. In the process of the base plate 22 moving back to the direction close to the fixed block 251, the base plate 22 will move more from the initial position to the direction close to the fixed block 251. The moving column moves a distance equal to the negative number, thereby offsetting the negative error value of the cylindrical rod; if the error of the cylindrical rod is a positive number, in the process of the clamping top rod 253 clamping the driving connecting rod, the moving column first causes the substrate 22 to drive the driving connecting rod to move in the direction away from the fixed block 251 under the action of the driving away groove 412, and then the linkage driving column 222 moves back in the direction close to the fixed block 251 under the action of the driving approaching groove 413. In the process of the substrate 22 moving back to the fixed block 251, the substrate 22 cannot move to the initial position, and the substrate 22 will be separated from the initial position by a distance equal to the positive number, thereby offsetting the positive error value of the cylindrical rod.

[0068] Through the above structure, the initial position of each welding of cylindrical rods with errors in the same batch is located at one end of the place where welding is required, which makes it less likely that the two ends are not welded in place or are welded to the outer wall of the cylindrical rod due to errors, thereby improving the welding quality.

[0069] In addition, when clamping and positioning the driving connecting rod, it is only necessary to place the driving connecting rod on the base plate 22 and then rotate the threaded driving column 252. During this process, the part of the linkage sleeve 32 protruding from the through hole 241 is completely pushed into the through hole 241, and the linkage sliding block 31 will move synchronously with the linkage sleeve 32, so that the clamping strip 2322 is disengaged from the clamping groove 3111. At this time, the linkage sliding block 31 will continue to move and make way under the action of the driving spring 233 and the lower positioning clamping block 26 until the lower positioning clamping block 26 is pressed against the cylindrical rod, thereby making it more convenient to install the driving connecting rod on the positioning tooling 2.

[0070] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A laser welding device for electric tool accessories, characterized in that: include: A positioning fixture (2) is used to place the driving connecting rod horizontally and to position and clamp the driving connecting rod; A rotation drive assembly (5), located on one side of the positioning fixture (2) and used to drive the positioning fixture (2) to rotate so as to perform welding on different positions of the driving connecting rod; A three-axis cantilever module welding mechanism (6), comprising a laser welding gun head (61) located above the positioning fixture (2), a cantilever linear module (62) driving the laser welding gun head (61) to move in a front-to-rear direction, a vertical linear module (63) driving the cantilever linear module (62) to move in a vertical direction, and a horizontal linear module (64) driving the vertical linear module (63) to move in a left-to-right direction; The positioning tool (2) comprises a base plate (22) for placing the driving connecting rod, a clamping assembly (23) for cooperating with the base plate (22) to clamp and position the driving connecting rod, an abutment block (24) located at one end of the driving connecting rod in the horizontal length direction for the driving connecting rod to abut against, and a clamping adjustment assembly (25) located at one end of the driving connecting rod in the horizontal length direction away from the abutment block (24) for clamping the driving connecting rod; A lower positioning clamping block (26) is arranged on the top of the base plate (22), and the lower positioning clamping block (26) is located below the clamping assembly (23). A lower positioning clamping groove (261) is provided on the top of the lower positioning clamping block (26) for the middle part of the cylindrical rod to be placed therein, and a side of the cylindrical rod close to the clamping assembly (23) protrudes from the lower positioning clamping groove (261), and the clamping assembly (23) presses the cylindrical rod tightly and limits it to be located in the lower positioning clamping groove (261); The clamping assembly (23) comprises an overhanging plate (231), an upper positioning clamping block (232) and a driving spring (233); one side of the overhanging plate (231) is mounted on the base plate (22), and the other side is located above the lower positioning clamping block (26) in an overhanging state; a square column (234) is provided on the portion of the overhanging plate (231) located above the lower positioning clamping block (26); the square column (234) extends in a direction approaching the lower positioning clamping block (26); the upper positioning clamping block (232) is sleeved on the square column (234) and slides on the square column (234) in a directional manner to clamp or release the cylindrical rod; the driving spring (233) is sleeved on the square column (234) to drive the upper positioning clamping block (232) to always have a tendency to move toward the lower positioning clamping block (26); The clamping adjustment assembly (25) comprises a fixed block (251) located at an end of the driving connecting plate away from the cylindrical rod, a threaded driving column (252) threadedly mounted on the fixed block (251), and a clamping push rod (253) fixedly mounted on an end of the threaded driving column (252) close to the driving connecting plate, the clamping push rod (253) passes through the fixed block (251) and abuts against the driving connecting plate, and the length direction of the driving connecting rod is clamped and limited by the abutting block (24) and the clamping push rod (253); It also includes an error adjustment component (4) that can drive the base plate (22) and the driving connecting rod to move when the threaded driving column (252) is rotated, thereby offsetting the error in the length of the cylindrical rod during welding; The positioning fixture (2) further comprises a rotating plate (21), the rotating drive assembly (5) drives the rotating plate (21) to rotate, the base plate (22) is slidably mounted on the rotating plate (21), and the base plate (22) rotates synchronously with the rotating plate (21), and the sliding direction of the base plate (22) is consistent with the length direction of the driving connecting rod; The error adjustment component (4) is partially rotatably mounted on the rotating plate (21) to drive the base plate (22) to move, and is partially mounted on the clamping top rod (253) to move synchronously with the clamping top rod (253); When the error of the cylindrical rod is a negative number, during the process in which the clamping top rod (253) clamps the driving connecting rod, the error adjustment component (4) drives the base plate (22) to drive the driving connecting rod to move from an initial position toward a direction close to the fixed block (251) by a distance equal to the negative number; When the error of the cylindrical rod is a positive number, during the process in which the clamping top rod (253) clamps the driving connecting rod, the error adjustment component (4) drives the base plate (22) to drive the driving connecting rod to move from an initial position in a direction away from the fixed block (251) by a distance equal to the positive number; The error adjustment assembly (4) comprises a rotating column (41), the rotating column (41) being located between the base plate (22) and the fixed block (251), the rotating column (41) being rotatably mounted on the rotating plate (21), a linkage drive column (222) being fixedly mounted on a side of the base plate (22) close to the rotating column (41), and an eccentric drive groove (411) being provided on the rotating column (41) for the linkage drive column (222) to be inserted so as to drive the base plate (22) to move; The eccentric driving groove (411) comprises a driving away groove (412) and a driving approaching groove (413), wherein the distance between an end of the driving approaching groove (413) close to the central axis of the rotating column (41) and the central axis of the rotating column (41) is smaller than the distance between an end of the driving away groove (412) close to the central axis of the rotating column (41) and the central axis of the rotating column (41); As the rotating column (41) rotates, the base plate (22) first moves in a direction away from the rotating column (41), and then moves in a direction close to the rotating column (41) until the driving connecting rod is clamped; The error adjustment assembly (4) further comprises a gear (42) which rotates synchronously with the rotating column (41) and a rack (43) which meshes with the gear (42) to drive the gear (42) to rotate; a rotating sleeve (44) is sleeved on the clamping top rod (253); the rotating sleeve (44) is rotatably mounted on the clamping top rod (253), and the rotating sleeve (44) moves synchronously with the clamping top rod (253); the rack (43) is connected to the rotating sleeve (44), and the rack (43) moves synchronously with the rotating sleeve (44).

2. The laser welding device for electric tool accessories according to claim 1, characterized in that: A clamping linkage assembly (3) is provided on the base plate (22); When the driving connecting rod is not clamped and limited by the abutment block (24) and the clamping top rod (253), the upper positioning clamping block (232) can be spaced apart from the lower positioning clamping block (26) via the clamping linkage assembly (3) to allow a cylindrical rod to be placed in the lower positioning clamping groove (261); When the threaded drive column (252) is rotated to allow the abutment block (24) and the clamping top rod (253) to clamp the drive connecting rod to a limited position, the upper positioning clamping block (232) can automatically descend through the clamping linkage assembly (3) and press the cylindrical rod to a limited position in the lower positioning clamping groove (261).

3. The laser welding device for electric tool accessories according to claim 2, characterized in that: The clamping linkage assembly (3) comprises a linkage sliding block (31) located on one side of the lower positioning clamping block (26); the linkage sliding block (31) is slidably mounted on the base plate (22); a side of the linkage sliding block (31) facing away from the base plate (22) is provided with an inclined surface (311); a bottom of one side of the upper positioning clamping block (232) is provided with a downward pressing inclined surface (2321) that is in contact with the inclined surface (311); a clamping strip (2322) is provided on the downward pressing inclined surface (2321); and a clamping groove (3111) is provided on the inclined surface (311) for the clamping strip (2322) to be clamped into. The clamping linkage assembly (3) further comprises a linkage sleeve (32) and a linkage connecting rod (34); a through hole (241) for inserting the linkage sleeve (32) is provided on a side of the abutment block (24) close to the cylindrical rod; an extension guide column (33) is connected to a side of the abutment block (24) away from the cylindrical rod; the linkage sleeve (32) is sleeved on the extension guide column (33) and slides on the extension guide column (33); the linkage connecting rod (34) is used to connect the linkage sleeve (32) and the linkage sliding block (31); the linkage sleeve (32) moves synchronously with the linkage sliding block (31); When the cylindrical rod is not pressed against the abutment block (24), the clamping strip (2322) is clamped in the clamping groove (3111), and a clearance is provided between the upper positioning clamping block (232) and the lower positioning clamping block (26) for the cylindrical rod to be placed in the lower positioning clamping groove (261). At this time, the end of the linkage sleeve (32) close to the cylindrical rod protrudes out of the through hole (241) and is located on a side of the abutment block (24) close to the cylindrical rod; When the cylindrical rod is pressed against the abutment block (24), the portion of the linkage sleeve (32) protruding from the through hole (241) is completely pushed into the through hole (241), and the linkage sliding block (31) moves synchronously with the linkage sleeve (32), so that the clamping strip (2322) is disengaged from the clamping groove (3111). At this time, the linkage sliding block (31) continues to move to make way under the action of the driving spring (233) and the upper positioning clamping block (232) until the upper positioning clamping block (232) is pressed against the cylindrical rod.

4. The laser welding device for electric tool accessories according to claim 1, characterized in that: The rotating sleeve (44) is connected to a limit strip (45), and the fixed block (251) is provided with a limit slot (2511) for the limit strip (45) to be inserted and slided.

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