Wide-seam continuous automatic welding equipment and welding process for electric bicycle transmission shafts

Abstract

The present invention relates to the technical field related to workpiece welding, specifically to wide-seam continuous automatic welding equipment for electric bicycle drive shafts and a welding process thereof. The wide-seam continuous automatic welding equipment for electric bicycle drive shafts includes a base, a three-jaw chuck installed on the base for clamping the drive shaft, and an assembly plate movably arranged on the base and connected to a bidirectional driving mechanism installed on the base. A detector and a welding gun are also movably provided on the assembly plate, and a linkage structure is connected between the detector and the welding gun. When welding, the reciprocating rotation mechanism can drive the drive shaft to reciprocate according to the detection result of the detector, so that when the welding gun is in different positions, the reciprocating rotation amplitude of the drive shaft corresponds to the width of the wide seam at that position, thereby realizing a comprehensive continuous automatic welding function for the wide seam, ensuring the accuracy of welding, avoiding the occurrence of missed welding or multiple welding, and providing effective protection for the service life and safety of the drive shaft.

Description

Technical Field

[0001] The present invention relates to the technical field related to workpiece welding, in particular to wide-slit continuous automatic welding equipment for an electric bicycle transmission shaft and a welding process thereof. Background Art

[0002] An electric bicycle is a vehicle that uses a battery as an auxiliary energy source and is based on an ordinary bicycle and is equipped with a motor, controller, battery, handlebar, brake handle and other operating components and a display instrument system. The drive shaft, as a common component in mechanical equipment, is used to transmit power and rotational force and is an indispensable part of an electric bicycle.

[0003] The driveshaft is a key component connecting the power unit and the wheels, so strict requirements are placed on the welds on the driveshaft. Common driveshaft welding methods include TIG welding, MIG / MAG welding, and manual arc welding. Weld parameters also have strict calculation requirements. Weld size calculation refers to calculating the weld size, including length, width, and depth, based on the operating conditions and requirements of the driveshaft. The calculation formula for weld size generally includes the following aspects:

[0004] 1. Weld length calculation formula;

[0005] The calculation formula for weld length is generally L=K1*P.

[0006] Where L is the weld length, Kl is the coefficient, and Р is the circumference of the drive shaft.

[0007] 2. Weld width calculation formula;

[0008] The calculation formula for weld width is generally W=K2*D.

[0009] Where W is the weld width, K2 is the coefficient, and D is the diameter of the drive shaft.

[0010] 3. Weld depth calculation formula;

[0011] The calculation formula for weld depth is generally H=K3*T.

[0012] Among them, H is the weld depth, K3 is the coefficient, and T is the wall thickness of the drive shaft.

[0013] The coefficients K1, K2 and K3 in the above three formulas need to be determined according to the specific drive shaft material and usage conditions.

[0014] In actual production, the length and depth of the weld can generally be calculated through measurement, but the width of the weld is greatly affected by the heat of welding, especially for wide seams with larger spans. The wide seam welding of the drive shaft is particularly important; the welding quality will directly affect the service life and safety of the drive shaft. The existing welding device usually fixes the drive shaft and completes the welding by controlling the movement of the welding gun. However, this welding method is difficult to ensure the accuracy of welding when there is inconsistency in the width of the wide seam, and is prone to cold welding or over-welding, making it difficult to ensure that the weld can achieve the designed torsional strength. Summary of the Invention

[0015] The purpose of the present invention is to provide a wide-seam continuous automatic welding device for an electric bicycle transmission shaft and a welding process thereof, so as to solve the problems raised in the above-mentioned background technology.

[0016] To achieve the above object, the present invention provides the following technical solutions:

[0017] Wide-seam continuous automatic welding equipment for electric bicycle transmission shafts, comprising a base, a three-jaw chuck mounted on the base for clamping the transmission shaft, and further comprising:

[0018] An assembly plate is movably mounted on the base and connected to a bidirectional drive mechanism mounted on the base. A detector and a welding gun are also movably mounted on the assembly plate, and a linkage structure is connected between the detector and the welding gun.

[0019] The detector is connected to a threaded lifting mechanism provided on the assembly plate, and the bidirectional driving mechanism can drive the assembly plate to drive the detector and the welding gun to move along the axial direction of the transmission shaft, so that the detector detects the width of the wide seam on the transmission shaft and the welding gun performs welding on the wide seam;

[0020] a reciprocating rotation mechanism, mounted on the base and connected to the rotating shaft of the three-jaw chuck; the reciprocating rotation mechanism is triggered during the welding process of the welding gun on the wide seam, and can drive the three-jaw chuck to drive the transmission shaft to reciprocate; the reciprocating rotation mechanism establishes communication with the detector and can adjust the amplitude of the reciprocating rotation of the transmission shaft according to the width of the wide seam;

[0021] The assembly plate is provided with a guide arm, a sleeve plate is slidably fitted on the guide arm, the detector is mounted on the sleeve plate, the threaded lifting mechanism includes a first screw rod rotatably mounted on the assembly plate and a first threaded sleeve provided on the sleeve plate and threadedly connected to the first screw rod, the first screw rod is connected to a two-stage trigger structure;

[0022] The two-stage trigger structure includes two ratchets rotatably mounted on the assembly plate and coaxially arranged, the rotating shafts of the two ratchets are connected to the first screw rod through a first transmission belt, and a frame is also installed on the base. Two ratchet plates are provided on the inner wall of the frame, and the two ratchet plates respectively cooperate with the two ratchets.

[0023] As a further solution of the present invention: a first slider is also slidably provided on the assembly plate, the welding gun is installed on the side of the first slider, the linkage structure includes two wheels rotatably installed on the assembly plate and a connecting belt connecting the two wheels, the connecting belt rolls with the two wheels, and the two sides of the connecting belt are respectively connected to the first threaded sleeve and the first slider through a first connecting member and a second connecting member.

[0024] As a further solution of the present invention: the reciprocating rotation mechanism includes a sliding fit assembly installed on the base, a circumferential drive assembly connected to the sliding fit assembly, and an electric control assembly connected to the circumferential drive assembly, and the electric control assembly communicates with the detector.

[0025] As a further solution of the present invention: a connecting frame is provided on the side of the assembly plate, the connecting frame is connected to the bidirectional drive mechanism, and the sliding fitting assembly includes a driven shaft rotatably mounted on the base and a driving pipe member slidably sleeved on the driven shaft and fixed to the connecting frame;

[0026] In which, a second slider is slidably provided on the connecting frame, the second slider is fixed to the first slider through a connecting arm, a column is fixed on the second slider, and a through hole and a groove adapted to the column are respectively provided on the driving pipe and the driven shaft, and the groove includes two first groove sections axially arranged along the driven shaft and a second groove section connecting the two first groove sections, the second groove section is arranged along a spiral, and the two first groove sections are collinear.

[0027] As a further embodiment of the present invention, the circumferential drive assembly includes a rotating plate rotatably mounted on the base, a driven block slidably mounted on the rotating plate, and a matching column provided on the driven block, a second transmission belt being connected between the rotating shafts of the rotating plate and the driven shaft, the driven block being connected to the electronic control assembly, a connecting shaft being rotatably mounted on the base, and the connecting shaft being connected to the rotating shaft of the three-jaw chuck via a bevel gear set;

[0028] The connecting shaft is slidably sleeved with a sleeve, the inner wall of the sleeve is provided with a boss, the outer wall of the connecting shaft is provided with a slide groove adapted to the boss, the slide groove is spirally arranged on the outer wall of the connecting shaft, and the boss extends into the slide groove and is slidably connected to the connecting shaft, the sleeve is also fixedly connected to a long rod, the long rod is provided with a through groove adapted to the matching column, the matching column passes through the through groove and is slidably connected to the long rod.

[0029] As a further solution of the present invention: the electronic control component includes an electric push rod installed on the base, a connecting plate arranged at the movable end of the electric push rod, and a transmission tube slidably sleeved on the rotating shaft of the rotating plate. The transmission tube is rotatably connected to the connecting plate and connected to the driven block through a push-pull rod. The two ends of the push-pull rod are respectively hinged to the driven block and the transmission tube.

[0030] The wide seam welding process of the electric bicycle transmission shaft adopts the wide seam continuous automatic welding equipment of the electric bicycle transmission shaft, and includes the following steps:

[0031] Step 1: Use the three-jaw chuck to fix the transmission shaft so that the wide slit faces upward;

[0032] Step 2: The bidirectional driving mechanism works in the forward direction, driving the detector to move along the axial direction of the transmission shaft to detect the width of the wide gap;

[0033] Step 3: After the detection is completed, the bidirectional drive mechanism works in the reverse direction, the detector is lifted, the welding gun is lowered, and the welding gun moves along the axial direction of the transmission shaft to weld the wide seam. The reciprocating rotation mechanism is triggered, and the three-jaw chuck is controlled to drive the transmission shaft to reciprocate according to the detection results of the detector;

[0034] Step 4: After welding is completed, the detector is lowered and reset, the welding gun is raised and reset, and the welded drive shaft is removed from the three-jaw chuck.

[0035] Compared with the prior art, the beneficial effects of the present invention are: the present invention is novel in design. When the transmission shaft is welded, the bidirectional drive mechanism drives the detector and the welding gun to move along the axial direction of the transmission shaft, and the width of the wide seam is detected by the detector. The welding gun performs the welding action. When the welding is performed, the reciprocating rotation mechanism can drive the transmission shaft to rotate back and forth according to the detection result of the detector, so that when the welding gun is in different positions, the amplitude of the reciprocating rotation of the transmission shaft corresponds to the width of the wide seam at that location, thereby realizing the continuous automatic welding function of the wide seam in a comprehensive manner, ensuring the accuracy of welding, avoiding the occurrence of missed welding or multiple welding, and providing effective protection for the service life and safety of the transmission shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1The present invention is a structural schematic diagram of an embodiment of wide-seam continuous automatic welding equipment for electric bicycle drive shafts.

[0037] Figure 2 The present invention is a structural schematic diagram from another angle of an embodiment of wide-seam continuous automatic welding equipment for electric bicycle drive shafts.

[0038] Figure 3 The present invention is a structural schematic diagram from another angle of an embodiment of a wide-seam continuous automatic welding device for an electric bicycle transmission shaft.

[0039] Figure 4 for Figure 3 A magnified view of the structure at point A in the middle.

[0040] Figure 5 The figure is a schematic diagram of the connection relationship between the linkage structure and the thread lifting mechanism in one embodiment of the wide-seam continuous automatic welding equipment for the electric bicycle drive shaft.

[0041] Figure 6 This is a schematic diagram of the connection state of the linkage structure and the thread lifting mechanism in one embodiment of the wide-seam continuous automatic welding equipment for the electric bicycle drive shaft.

[0042] Figure 7 This is a structural explosion diagram of the linkage structure in one embodiment of wide-seam continuous automatic welding equipment for electric bicycle drive shafts.

[0043] Figure 8 This is an exploded view of the structure of the reciprocating rotating mechanism in one embodiment of the wide-seam continuous automatic welding equipment for electric bicycle drive shafts.

[0044] In the figure: 1, base; 2, three-jaw chuck; 3, assembly plate; 4, detector; 5, welding gun; 6, guide arm; 7, sleeve plate; 8, first screw rod; 9, first threaded sleeve; 10, rotating wheel; 11, connecting belt; 1101, first connecting member; 1102, second connecting member; 12, first slider; 13, connecting arm; 14, second slider; 1401, column; 15, connecting frame; 16, second threaded sleeve; 17, guide sleeve; 18, drive motor; 19, second screw rod; 20, guide Directional rod; 21. Frame; 22. Ratchet plate; 23. Ratchet; 24. First transmission belt; 25. Driving pipe; 26. Driven shaft; 2601. First slot section; 2602. Second slot section; 27. Second transmission belt; 28. Rotating plate; 29. ​​Driven block; 2901. Matching column; 30. Long rod; 3001. Through slot; 31. Connecting shaft; 3101. Slide slot; 32. Bevel gear set; 33. Sleeve; 34. Electric push rod; 35. Connecting plate; 36. Transmission pipe; 37. Push-pull rod. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0047] See also Figures 1-8 In an embodiment of the present invention, a wide-seam continuous automatic welding device for an electric bicycle transmission shaft comprises a base 1, a three-jaw chuck 2 mounted on the base 1 for clamping the transmission shaft, and further comprising:

[0048] An assembly plate 3 is movably mounted on the base 1 and connected to a bidirectional drive mechanism mounted on the base 1. A detector 4 and a welding gun 5 are also movably mounted on the assembly plate 3. A linkage structure is connected between the detector 4 and the welding gun 5.

[0049] The detector 4 is connected to a threaded lifting mechanism provided on the assembly plate 3. The bidirectional driving mechanism can drive the assembly plate 3 to drive the detector 4 and the welding gun 5 to move along the axial direction of the transmission shaft, so that the detector 4 can detect the width of the wide seam on the transmission shaft, and the welding gun 5 can weld the wide seam.

[0050] The reciprocating rotation mechanism is installed on the base 1 and is connected to the rotating shaft of the three-jaw chuck 2. The reciprocating rotation mechanism is triggered during the process of the welding gun 5 welding the wide seam, and can drive the three-jaw chuck 2 to drive the transmission shaft to rotate reciprocatingly. The reciprocating rotation mechanism establishes communication with the detector 4 and can adapt the amplitude of the reciprocating rotation of the transmission shaft according to the width of the wide seam.

[0051] Among them, it should be supplemented that the detector 4 is a sensor, which can detect the width of the width on the transmission shaft in real time during the axial movement along the transmission shaft, and send the detected vertical to the computer, which is recorded by the computer. After the wide seam width detection process is completed, the computer will send a control command to the reciprocating rotation mechanism, so that during the welding work of the welding gun 5 moving along the axial direction of the transmission shaft, the reciprocating rotation mechanism can change the amplitude of the reciprocating rotation of the transmission shaft, so that the welding of the wide seam on the transmission shaft can be fully welded.

[0052] In addition, during operation, the three-jaw chuck 2 clamps the transmission shaft to be processed. Taking the state shown in the accompanying figure as an example, initially, the detector 4 is close to the transmission shaft, and the bidirectional drive mechanism works in the forward direction, driving the assembly plate 3 to drive the detector 4 and the welding gun 5 to move along the axial direction of the transmission shaft toward the three-jaw chuck 2. During this process, the reciprocating rotation mechanism does not move, and the transmission shaft remains stationary. The detector 4 detects the width of the wide gap on the transmission shaft, so that the reciprocating rotation mechanism can subsequently control the amplitude of the reciprocating rotation of the transmission shaft.

[0053] Subsequently, after the detection process is completed, the bidirectional drive mechanism works in the reverse direction, and the assembly plate 3 drives the detector 4 and the welding gun 5 to move away from the three-jaw chuck 2. During this process, the threaded lifting mechanism is triggered to drive the detector 4 to lift up, and the welding gun 5 is prompted to descend through the linkage structure. At the same time, the reciprocating rotation mechanism is triggered to drive the three-jaw chuck 2 to drive the drive shaft to rotate back and forth, so that the welding gun 5 can perform comprehensive welding processing on the wide seam on the drive shaft.

[0054] In summary, when the transmission shaft is welded, the bidirectional drive mechanism drives the detector 4 and the welding gun 5 to move along the axial direction of the transmission shaft, and the width of the wide seam is detected by the detector 4, and the welding gun 5 performs the welding action. When the welding 5 is welding, the reciprocating rotation mechanism can drive the transmission shaft to rotate back and forth according to the detection result of the detector 4, so that when the welding gun 5 is in different positions, the amplitude of the reciprocating rotation of the transmission shaft corresponds to the width of the wide seam at that location, thereby realizing the continuous automatic welding function of the wide seam in a comprehensive manner, ensuring the accuracy of welding, avoiding the occurrence of missed welding or multiple welding, and providing effective protection for the service life and safety of the transmission shaft.

[0055] Please refer again Figure 5 、 Figure 6 as well as Figure 7The assembly plate 3 is provided with a guide arm 6, on which a sleeve plate 7 is slidably fitted. The detector 4 is mounted on the sleeve plate 7. The threaded lifting mechanism includes a first screw 8 rotatably mounted on the assembly plate 3 and a first threaded sleeve 9 provided on the sleeve plate 7 and threadedly connected to the first screw 8. The first screw 8 is connected to a two-stage trigger structure. The two-stage trigger structure includes two ratchets 23 rotatably mounted on the assembly plate 3 and coaxially arranged. The rotation axes of the two ratchets 23 are connected to the first screw 8 via a first transmission belt 24. A frame 21 is also mounted on the base 1. The inner wall of the frame 21 is provided with two ratchet plates 22. The two ratchet plates 22 cooperate with the two ratchets 23 respectively. The two ratchets 23 are placed in opposite directions, and the pawls on the two ratchet plates 22 face the same direction.

[0056] During the process of the detector 4 detecting the wide seam, that is, when the two-way driving mechanism works forward and drives the assembly plate 3 toward the three-jaw chuck 2, the two ratchet wheels 23 do not rotate when passing through the two ratchet plates 22, and when the two-way driving mechanism works reversely, one of the ratchet wheels 23 will pass through the ratchet plate 22 close to the three-jaw chuck 2, and the ratchet wheel 23 will rotate, driving the first screw rod 8 to rotate through the first transmission belt 24, and the first threaded sleeve 9 is threadedly engaged with the first screw rod 8. The sleeve plate 7 slides upward on the guide arm 6, thereby prompting the detector 4 to rise. Accordingly, the first threaded sleeve 9 drives the welding gun 5 to descend through the linkage structure to enter the welding process. Subsequently, when the other ratchet wheel 23 passes through the ratchet plate 22 away from the three-jaw chuck 2, the ratchet wheel 23 will rotate, and the rotation direction is opposite to that of the previous ratchet wheel 23. Then, the detector 4 descends and resets, and the linkage structure drives the welding gun 5 to rise and reset.

[0057] A first slider 12 is also slidably provided on the assembly plate 3, and the welding gun 5 is installed on the side of the first slider 12. The linkage structure includes two wheels 10 rotatably installed on the assembly plate 3 and a connecting belt 11 connecting the two wheels 10. The connecting belt 11 rolls with the two wheels 10, and the two sides of the connecting belt 11 are respectively connected to the first threaded sleeve 9 and the first slider 12 through a first connecting member 1101 and a second connecting member 1102.

[0058] When the first threaded sleeve 9 drives the detector 4 to lift up through the sleeve plate 7, the first threaded sleeve 9 will drive the connecting belt 11 to move on the two rotating wheels 10 through the first connecting member 1101, so that the connecting belt 11 can drive the first slider 12 to slide downward through the second connecting member 1102, so as to prompt the welding gun 5 to descend to a height suitable for welding. On the contrary, when the detector 4 descends and resets, the welding gun 5 ascends and resets, thereby realizing the movement pattern of the detector 4 and the welding gun 5 rising and falling.

[0059] Please refer again Figure 4 、 Figure 5 as well as Figure 8 The reciprocating mechanism includes a sliding fit assembly mounted on the base 1, a circumferential drive assembly connected to the sliding fit assembly, and an electronic control assembly connected to the circumferential drive assembly, wherein the electronic control assembly communicates with the detector 4. A connecting frame 15 is provided on the side of the assembly plate 3. The connecting frame 15 is connected to the bidirectional drive mechanism. The sliding fit assembly includes a driven shaft 26 rotatably mounted on the base 1 and a drive pipe 25 slidably sleeved on the driven shaft 26 and fixed to the connecting frame 15.

[0060] In which, a second slider 14 is slidably provided on the connecting frame 15, and the second slider 14 is fixed to the first slider 12 through a connecting arm 13. A column 1401 is fixed on the second slider 14, and the driving pipe 25 and the driven shaft 26 are respectively provided with a through hole and a groove adapted to the column 1401, and the groove includes two first groove sections 2601 axially arranged along the driven shaft 26 and a second groove section 2602 connecting the two first groove sections 2601, the second groove section 2602 is arranged along a spiral, and the two first groove sections 2601 are collinear.

[0061] It should be pointed out that the purpose of the two first groove sections 2601 being colinear is that, during the movement of the assembly plate 3 toward the three-jaw chuck 2 (that is, when the detector 4 performs detection work), the transmission shaft needs to remain stationary. At this time, the column 1401 is separated from the driven shaft 26, and the column 1401 will subsequently enter the first groove section 2601 through the through hole on the driving pipe 25, so that the column 1401 can drive the driven shaft 26 to rotate when passing through the second groove section 2602, so that the transmission shaft rotates back and forth, cooperating with the welding gun 5 to complete the wide seam welding. After the welding process is completed, the column 1401 will be pulled out from the other first groove section 2601. At this time, the two first groove sections 2601 are facing upward, so that the column 1401 can smoothly enter the groove during subsequent processing.

[0062] Furthermore, taking the state of the accompanying figure as an example, at this time, the column 1401 and the driven shaft 26 are in a separated state. When the staff uses the three-jaw chuck 2 to clamp the transmission shaft, it is easy to accidentally cause the three-jaw chuck 2 to rotate, and then, it may cause the driven shaft 26 to rotate, making it impossible for the first groove section 2601 to remain in an upward state. Subsequently, the column 1401 cannot smoothly enter the first groove section 2601. Therefore, every time the processing is completed, the driven shaft 26 needs to be rotated. To lock the driven shaft 26, specifically, a limit groove can be provided at the section where the driven shaft 26 is away from the first groove section 2601 of the three-jaw chuck 2, and a limit block adapted to the limit groove is provided on the inner wall of the driving pipe 25. In the latter stage of the welding process, after the column 1401 enters the first groove section 2601, the limit block will dock with the limit groove, thereby enabling the driven shaft 26 to be locked, thereby preventing the driven shaft 26 from accidentally rotating when the three-jaw chuck 2 is manually operated.

[0063] In detail, the bidirectional drive mechanism includes a second screw rod 19 rotatably mounted on the base 1, a second threaded sleeve 16 sleeved on the second screw rod 19 and threadedly connected to the second screw rod 19, and a drive motor 18 mounted on the base 1 and connected to the second screw rod 19 at the output end. The second threaded sleeve 16 is fixed to the connecting frame 15, and a guide sleeve 17 is also provided on the connecting frame 15. The guide sleeve 17 slides into engagement with a guide rod 20 mounted on the base 1.

[0064] When the driving motor 18 drives the second screw rod 19 to rotate, the threaded fit between the second screw rod 19 and the second threaded sleeve 16 can cause the assembly plate 3 to move horizontally, so that the detector 4 enters the detection process and the welding gun 5 enters the welding process. Moreover, since the threaded fit between the second screw rod 19 and the second threaded sleeve 16 has the characteristics of high precision and high stability, the detection accuracy of wide seams and the welding processing effect can be effectively improved.

[0065] The circumferential drive assembly includes a rotating plate 28 rotatably mounted on the base 1, a driven block 29 slidably arranged on the rotating plate 28, and a matching column 2901 arranged on the driven block 29. A second transmission belt 27 is connected between the rotating shafts of the rotating plate 28 and the driven shaft 26. The driven block 29 is connected to the electronic control assembly. A connecting shaft 31 is also rotatably mounted on the base 1. The connecting shaft 31 is connected to the rotating shaft of the three-jaw chuck 2 through a bevel gear set 32. A sleeve 33 is slidably sleeved on the connecting shaft 31, and a boss is provided on the inner wall of the sleeve 33. A groove 3101 adapted to the boss is provided on the outer wall of the connecting shaft 31. The groove 3101 is spirally arranged on the outer wall of the connecting shaft 31, and the boss extends into the groove 3101 and is slidably connected to the connecting shaft 31. The sleeve 33 is also fixedly connected to a long rod 30, and a through groove 3001 adapted to the matching column 2901 is provided on the long rod 30. The matching column 2901 passes through the through groove 3001 and is slidably connected to the long rod 30.

[0066] It should be emphasized that, taking the state shown in the accompanying drawings as an example, after the drive shaft to be processed is fixed, it is necessary to ensure that the wide gap on the drive shaft faces directly upward. At this time, the boss is located at the midpoint of the slide groove 3101.

[0067] When the welding gun 5 descends, the first slide 12 will drive the second slide 14 to descend through the connecting arm 13, so that the column 1401 enters the first groove section 2601 through the through hole on the driving pipe 25. Subsequently, when the welding gun 5 moves to weld, the column 1401 enters the second groove section 2602, which will cause the driven shaft 26 to rotate. The driven shaft 26 drives the rotating plate 28 to rotate through the second transmission belt 27. As a result, the matching column 2901 makes a circular motion and slides with the connecting shaft 31 through the through groove 3001, causing the sleeve 33 to slide back and forth on the connecting shaft 31. Correspondingly, the protruding column located on the inner wall of the sleeve 33 slides with the connecting shaft 31 through the sliding groove 3101, causing the connecting shaft 31 to rotate back and forth. The connecting shaft 31 drives the transmission shaft to rotate back and forth through the bevel gear set 32 ​​and the three-jaw chuck 2, so as to achieve comprehensive wide seam welding processing.

[0068] Furthermore, the bevel gear set 32 ​​includes a first bevel gear mounted on the connecting shaft 31 and a second bevel gear mounted on the rotating shaft of the three-jaw chuck 2 , and the second bevel gear is meshed with the first bevel gear.

[0069] Secondly, in order to ensure the stability of the cooperation between the boss and the slide groove 3101 and the cooperation column 2901 and the through groove 3001, the long rod 30 should be guided. Specifically, a corresponding guide rail can be set on the base 1 to ensure that the long rod 30 can only move axially along the connecting shaft 31.

[0070] The electronic control component includes an electric push rod 34 installed on the base 1, a connecting plate 35 arranged at the movable end of the electric push rod 34, and a transmission tube 36 slidably sleeved on the rotating shaft of the rotating plate 28. The transmission tube 36 is rotatably connected to the connecting plate 35 and is connected to the driven block 29 through a push-pull rod 37. The two ends of the push-pull rod 37 are respectively hinged to the driven block 29 and the transmission tube 36.

[0071] During the welding process, since the width of the wide seam may be different at different stages, the electric push rod 34 drives the transmission tube 36 to slide on the rotating axis of the rotating plate 28 according to the received instructions, and the transmission tube 36 drives the driven block 29 to slide on the rotating plate 28 through the push-pull rod 37. The trajectory radius of the circular motion of the matching column 2901 changes, and the matching range between the protruding column and the slide groove 3101 changes, that is, the amplitude of the reciprocating rotation of the connecting shaft 31 and the transmission shaft changes, so that the transmission shaft can adjust the rotation amplitude by itself according to the width of the wide seam, ensuring that the welding work is carried out comprehensively, effectively and continuously.

[0072] As another embodiment of the present invention, a wide seam welding process for an electric bicycle transmission shaft is also proposed, using the wide seam continuous automatic welding equipment for the electric bicycle transmission shaft, comprising the following steps:

[0073] Step 1: Use the three-jaw chuck 2 to fix the transmission shaft so that the wide slit faces upward;

[0074] Step 2: The bidirectional driving mechanism works in the forward direction, driving the detector 4 to move along the axial direction of the transmission shaft to detect the width of the wide gap;

[0075] Step 3: After the detection is completed, the bidirectional drive mechanism works in the reverse direction, the detector 4 is lifted, the welding gun 5 is lowered, and the welding gun 5 moves along the axial direction of the transmission shaft to weld the wide seam. The reciprocating rotation mechanism is triggered, and the three-jaw chuck 2 is controlled to drive the transmission shaft to reciprocate according to the detection result of the detector 4;

[0076] Step 4: After welding is completed, the detector 4 is lowered and reset, the welding gun 5 is raised and reset, and the welded transmission shaft on the three-jaw chuck 2 is removed.

[0077] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0078] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A wide-seam continuous automatic welding device for an electric bicycle transmission shaft, comprising a base (1), a three-jaw chuck (2) mounted on the base (1) for clamping the transmission shaft, and characterized in that: Also includes: An assembly plate (3) is movably mounted on the base (1) and connected to a bidirectional drive mechanism mounted on the base (1). A detector (4) and a welding gun (5) are also movably mounted on the assembly plate (3). A linkage structure is connected between the detector (4) and the welding gun (5); The detector (4) is connected to a threaded lifting mechanism provided on the assembly plate (3), and the bidirectional driving mechanism can drive the assembly plate (3) to drive the detector (4) and the welding gun (5) to move along the axial direction of the transmission shaft, so that the detector (4) detects the width of the wide seam on the transmission shaft, and the welding gun (5) performs welding processing on the wide seam; A reciprocating rotating mechanism is mounted on the base (1) and connected to the rotating shaft of the three-jaw chuck (2). The reciprocating rotating mechanism is triggered during the process of the welding gun (5) welding the wide seam, and can drive the three-jaw chuck (2) to drive the transmission shaft to reciprocate. The reciprocating rotating mechanism establishes communication with the detector (4) and can change the amplitude of the reciprocating rotation of the transmission shaft according to the width of the wide seam. The assembly plate (3) is provided with a guide arm (6), a sleeve plate (7) is slidably fitted on the guide arm (6), the detector (4) is mounted on the sleeve plate (7), the threaded lifting mechanism comprises a first screw rod (8) rotatably mounted on the guide arm (6) and a first threaded sleeve (9) provided on the sleeve plate (7) and threadedly connected to the first screw rod (8), the first screw rod (8) being connected to a two-stage trigger structure; The two-stage trigger structure comprises two ratchets (23) rotatably mounted on the assembly plate (3) and coaxially arranged, the rotation axes of the two ratchets (23) being connected to the first screw rod (8) via a first transmission belt (24), a frame (21) being further mounted on the base (1), two ratchet plates (22) being provided on the inner wall of the frame (21), the two ratchet plates (22) being respectively engaged with the two ratchets (23); A first slider (12) is also slidably provided on the assembly plate (3), and the welding gun (5) is mounted on the side of the first slider (12). The linkage structure includes two rotating wheels (10) rotatably mounted on the assembly plate (3) and a connecting belt (11) connecting the two rotating wheels (10). The connecting belt (11) is in rolling cooperation with the two rotating wheels (10), and both sides of the connecting belt (11) are connected to the first threaded sleeve (9) and the first slider (12) through a first connecting member (1101) and a second connecting member (1102) respectively. The reciprocating rotation mechanism comprises a sliding fit assembly mounted on the base (1), a circumferential drive assembly connected to the sliding fit assembly, and an electric control assembly connected to the circumferential drive assembly, wherein the electric control assembly communicates with the detector (4); A connecting frame (15) is provided on the side of the assembly plate (3), and the connecting frame (15) is connected to the bidirectional drive mechanism. The sliding fitting assembly includes a driven shaft (26) rotatably mounted on the base (1) and a driving pipe (25) slidably sleeved on the driven shaft (26) and fixed to the connecting frame (15); wherein a second slider (14) is slidably provided on the connecting frame (15), the second slider (14) is fixed to the first slider (12) via a connecting arm (13), a column (1401) is fixed on the second slider (14), a through hole and a groove adapted to the column (1401) are respectively provided on the driving pipe (25) and the driven shaft (26), the groove comprising two first groove sections (2601) axially arranged along the driven shaft (26) and a second groove section (2602) connecting the two first groove sections (2601), the second groove section (2602) being arranged along a spiral, and the two first groove sections (2601) being collinear; The circumferential drive assembly includes a rotating plate (28) rotatably mounted on the base (1), a driven block (29) slidably mounted on the rotating plate (28), and a matching column (2901) arranged on the driven block (29); a second transmission belt (27) is connected between the rotating shafts of the rotating plate (28) and the driven shaft (26); the driven block (29) is connected to the electronic control assembly; a connecting shaft (31) is also rotatably mounted on the base (1); the connecting shaft (31) is connected to the rotating shaft of the three-jaw chuck (2) through a bevel gear set (32); The connecting shaft (31) is provided with a sleeve (33) for sliding, and the inner wall of the sleeve (33) is provided with a boss, and the outer wall of the connecting shaft (31) is provided with a slide groove (3101) adapted to the boss, and the slide groove (3101) is spirally arranged on the outer wall of the connecting shaft (31), and the boss extends into the slide groove (3101) and is slidably connected to the connecting shaft (31), and the sleeve (33) is also fixedly connected to a long rod (30), and the long rod (30) is provided with a through groove (3001) adapted to the matching column (2901), and the matching column (2901) passes through the through groove (3001) and is slidably connected to the long rod (30); a guide rail is provided on the base (1) to ensure that the long rod (30) can only move along the axial direction of the connecting shaft (31); The electric control component includes an electric push rod (34) installed on the base (1), a connecting plate (35) arranged at the movable end of the electric push rod (34), and a transmission tube (36) slidably sleeved on the rotating shaft of the rotating plate (28), the transmission tube (36) is rotatably connected to the connecting plate (35), and is connected to the driven block (29) through a push-pull rod (37), and the two ends of the push-pull rod (37) are respectively hinged to the driven block (29) and the transmission tube (36).

2. The wide seam welding process of the electric bicycle transmission shaft adopts the wide seam continuous automatic welding equipment of the electric bicycle transmission shaft as claimed in claim 1, characterized in that: The following steps are involved: Step 1: Use the three-jaw chuck (2) to fix the transmission shaft so that the wide slit faces upwards; Step 2: The bidirectional driving mechanism works in the forward direction, driving the detector (4) to move along the axial direction of the transmission shaft to detect the width of the wide gap; Step 3: After the detection is completed, the bidirectional driving mechanism works in the reverse direction, the detector (4) is lifted, the welding gun (5) is lowered, and the welding gun (5) moves along the axial direction of the transmission shaft to weld the wide seam. The reciprocating rotation mechanism is triggered, and the three-jaw chuck (2) is controlled to drive the transmission shaft to reciprocate according to the detection result of the detector (4); Step 4: After welding is completed, the detector (4) is lowered and reset, the welding gun (5) is raised and reset, and the welded transmission shaft on the three-jaw chuck (2) is removed.

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