A welding assembly apparatus for EGR pipes and its method of use.

Abstract

This invention belongs to the technical field of welding equipment, specifically referring to a welding assembly device for EGR pipes and its usage method. It includes a pre-clamping assembly, a convergence clamping assembly, a planetary drive assembly, a unidirectional rotation assembly, a welding assembly, a feeding assembly, a synchronization assembly, a first welding pipe, and a frame. The pre-clamping assembly is rotatably mounted within the planetary drive assembly, the convergence clamping assembly is rotatably mounted on the pre-clamping assembly, the planetary drive assembly is located within the welding assembly, and the unidirectional rotation assembly is located at one end of the planetary drive assembly. This invention uses a drive gear and a clamping gear ring to drive the rotating sleeve to rotate, thereby clamping and fixing the first welding pipe. After clamping is complete, the planetary gear set automatically synchronizes internally and is driven to rotate as a whole by the drive motor. At this time, the pre-clamping pipe and the rotating sleeve rotate synchronously, thus achieving the technical objective of driving the first welding pipe to rotate during the clamping process.

Description

Technical Field

[0001] This invention belongs to the field of welding equipment technology, specifically referring to a welding assembly device for EGR pipes and its usage method. Background Technology

[0002] EGR (Exhaust Gas Recirculation) pipes are specialized pipelines that draw a portion of high-temperature exhaust gas from the exhaust manifold or exhaust pipe, cool it, and then return it to the intake manifold. The main structure of the EGR pipe is made of straight and bent pipes welded together. Traditional automatic welding is mostly done by welding robots, which is expensive. Furthermore, the axial positioning and clamping of the pipes are cumbersome, resulting in significant efficiency losses during mass production. Summary of the Invention

[0003] In view of the above situation and to overcome the defects of the prior art, the present invention provides a welding assembly device for EGR pipe and its usage method. The planetary drive assembly can automatically switch its drive mode according to whether the clamping screw block and the first welding pipe are in contact. First, it drives the rotating sleeve to rotate through the drive gear and the clamping gear ring to achieve clamping and fixing of the first welding pipe. After clamping is completed, the internal parts of the planetary gear set will automatically synchronize and be driven to rotate as a whole by the drive motor. At this time, the pre-clamped pipe and the rotating sleeve rotate synchronously, thereby achieving the technical purpose of driving the first welding pipe to rotate during the clamping process.

[0004] Furthermore, in order to control the automatic start and stop of the welding head, the swing amplitude of the pawl is sensed by a status sensor switch to determine whether it is currently in the clamping, welding or unlocking stage. It can also identify the number of ratchet teeth that have passed and provide feedback on the welding angle.

[0005] The technical solution adopted by the present invention is as follows: The present invention proposes a welding assembly device for EGR pipes, including a pre-clamping assembly, a gathering clamping assembly, a planetary drive assembly, a unidirectional rotation assembly, a welding assembly, a feeding assembly, a synchronization assembly, a first welding pipe, and a frame. The pre-clamping assembly is rotatably disposed in the planetary drive assembly, the gathering clamping assembly is rotatably disposed on the pre-clamping assembly, the planetary drive assembly is disposed in the welding assembly, the unidirectional rotation assembly is disposed at one end of the planetary drive assembly, the welding assembly and the feeding assembly are disposed on the frame, the synchronization assembly is disposed on one side of the welding assembly, and the first welding pipe is located in the pre-clamping assembly.

[0006] The clamping and fixing of the first welded pipe can be achieved by the relative rotation of the clamping assembly and the pre-clamping assembly.

[0007] Furthermore, the pre-clamping assembly includes a pre-clamping tube, elastic pre-clamping pieces, and a rotating sleeve. One end of the pre-clamping tube is provided with a limiting flange and a clearance notch. The elastic pre-clamping pieces are evenly distributed in a ring on the inner wall of the pre-clamping tube. The first welded pipe is located in the elastic pre-clamping pieces. The rotating sleeve is rotatably mounted on the pre-clamping tube. Guide bosses are evenly distributed in a ring on the rotating sleeve.

[0008] By using the elastic limit of the elastic pre-clamping plate, the relative positions of the pre-clamping pipe and the first welded pipe can be kept stationary when the clamping screw block does not clamp the first welded pipe, thereby ensuring that the position of the first welded pipe will not shift secondary during the clamping and locking process.

[0009] Furthermore, the convergence clamping assembly includes a clamping screw block, a convergence sleeve, and a clamping gear ring. The clamping screw block has an elastic portion and is positioned in a clearance notch through the elastic portion. The inner wall of the convergence sleeve has a guide groove that matches the guide boss. The convergence sleeve is engaged and slidably mounted on the rotating sleeve. The end of the convergence sleeve has an internal thread that matches the clamping screw block. The clamping gear ring is fixedly connected to the rotating sleeve.

[0010] By means of the threaded connection on the two inclined surfaces of the clamping screw block and the internal thread, the tightening sleeve can move closer to or further away from the first welded pipe during rotation, thereby achieving clamping and fixing or unlocking and releasing of the first welded pipe.

[0011] Furthermore, the planetary drive assembly includes a drive gear, a rotating gear ring, and a support base. The support base is disposed on the welding assembly, and the clamping gear ring and the rotating gear ring are rotatably disposed in the support base. The drive gear and the clamping gear ring mesh and transmit power to each other, and the rotating gear ring is fixedly connected to the pre-clamping tube.

[0012] Preferably, the planetary drive assembly further includes a drive motor and a planetary gear set. The drive motor and the pawl are both located in the feeding assembly of the planetary drive assembly. The input shaft of the planetary gear set is connected to the drive shaft of the drive motor. The drive gear is located on the output shaft of the planetary gear set. The outer gear ring of the planetary gear set meshes with the rotating gear ring.

[0013] The planetary gear set has two drive modes that can be automatically switched. During the continuous rotation of the drive motor, the first welded pipe can be clamped and fixed first, and after the fixing is completed, the clamp will automatically drive the first welded pipe to rotate together.

[0014] Furthermore, the unidirectional rotating assembly includes an inner ratchet ring, a pawl, a swing pin, and a status sensing switch. The inner ratchet ring is rotatably mounted in the support base, the swing pin is fixed to the rotating ring, the pawl is hinged to the swing pin, the fixed part of the status sensing switch is mounted on the rotating ring, and the pawl abuts against the moving part of the status sensing switch.

[0015] The unidirectional rotation component not only restricts the rotation direction of the pre-clamped tube, providing the necessary preconditions for unlocking during reversal, but also uses the compression amplitude of the status sensing switch to feedback the swing amplitude of the swing pin, thereby determining the number of ratchet teeth passed by the pawl and controlling the automatic start and stop of the welding head.

[0016] Furthermore, the welding assembly includes a base plate, a welding head, and a frame bracket, wherein the welding head is disposed on the base plate, the support base is disposed on the base plate, and the frame bracket is disposed on the base plate.

[0017] Furthermore, the feeding assembly includes a feeder and a second welding pipe, the feeder being mounted on the frame and the second welding pipe being disposed within the feeder.

[0018] The feeder has guide rollers inside that roll into contact with the second welding pipe. The rollers inside the feeder have the ability to drive the second welding pipe to move axially, but the second welding pipe can rotate freely in the feeder.

[0019] Furthermore, the synchronization component includes a synchronization bracket, a synchronization wheel, and a synchronization shaft. The synchronization bracket is fixed to the side of the welding head, the synchronization shaft is rotatably disposed in the synchronization bracket, the synchronization wheel is fixed to the synchronization shaft, the synchronization shaft has rolling contact with the first welding pipe, and the synchronization shaft has rolling contact with the second welding pipe.

[0020] The present invention also proposes a method for using a welding assembly device for EGR pipes, specifically including the following steps:

[0021] Step 1: First, the second welded pipe is transported to the designated position by the feeder. The rollers inside the feeder have the ability to drive the second welded pipe to move axially, but the second welded pipe can rotate freely in the feeder. Then, the first welded pipe is inserted into the pre-clamping pipe and axially positioned by the limiting flange. The first welded pipe is elastically pre-clamped by the elastic pre-clamping piece, so that it is temporarily stationary relative to the pre-clamping pipe. At this time, the first welded pipe and the second welded pipe are in contact, and the weld head is located below the joint between the two.

[0022] Step 2: Start the drive motor and drive the input shaft of the planetary gear set to rotate. Due to the large rotational resistance between the rotating gear ring and the support seat, and the resistance of the pawl sliding along the inner ratchet ring, the outer gear ring and the rotating gear ring of the planetary gear set will remain stationary in the initial state. The drive motor drives the planet carrier of the planetary gear set to rotate, and then drives the rotating sleeve to rotate through the drive gear and the clamping gear ring.

[0023] As the rotating sleeve drives the coiling sleeve to rotate, due to the threaded connection between the internal thread and the clamping screw, the coiling sleeve will slide laterally relative to the rotating sleeve. As the coiling sleeve approaches the limiting flange, the clamping screw will gradually contract and squeeze the first welded pipe, thus completing the clamping and fixing between the pre-clamped pipe and the first welded pipe.

[0024] Step 3: After the first welded pipe is clamped, it will be coaxial with the pre-clamped pipe. At this time, the wheel rims at both ends of the synchronous pulley will abut against the first welded pipe and the second welded pipe respectively. The diameter of the middle part of the synchronous pulley is smaller to avoid interference with the weld.

[0025] Step 4: After the clamping screw block is pressed against the first welded pipe, the rotating sleeve and the pre-clamping pipe cannot rotate relative to each other. At this time, the pre-clamping pipe and the rotating sleeve rotate synchronously as a whole. In this stage, the planetary gear set also acts as a whole. The planetary carrier of the planetary gear set drives the clamping gear ring to rotate through the drive gear. The outer gear ring of the planetary gear set drives the rotating gear ring to rotate. At this time, the first welded pipe gradually rotates while maintaining the clamping state.

[0026] Step 5: At this point, since both the first and second welded pipes are in rolling contact with the synchronous pulley, the rotation of the first welded pipe will drive the second welded pipe to rotate as well.

[0027] Step 6: When the pre-clamping tube is not rotating, the pawl is located at the deepest part of the inner ratchet ring. At this time, the status sensor switch is in the off state. When the pre-clamping tube starts to rotate, the end of the pawl slides along the ratchet surface of the inner ratchet ring. The status sensor switch changes from the off state to the on state under the pressure of the pawl.

[0028] As the pre-clamping tube rotates continuously, the compression amplitude of the status sensor switch changes as the pawl disengages from one ratchet tooth and contacts the next. However, it remains in the "on" state. When the status sensor switch is in the "on" state, the welding head starts to weld the first and second welding pipes. Welding is completed after the pre-clamping tube rotates one revolution. Because the number of ratchet teeth in the inner ratchet ring is fixed, the rotation angle of the pre-clamping tube can be fed back through the periodic change of the compression amplitude of the status sensor switch.

[0029] Step 7: After welding is completed, the drive motor reverses. First, the pre-clamping tube will reverse slightly until the pawl touches the deepest part of the ratchet of the inner ratchet ring. At this time, the status sensor switch changes from the on state to the off state, and the pre-clamping tube can no longer rotate.

[0030] Then the drive motor continues to rotate, the outer gear ring of the planetary gear set remains stationary like the pre-clamping tube, and the planet carrier of the planetary gear set drives the rotating sleeve to rotate in the opposite direction through the drive gear and the clamping gear ring. The clamping screw gradually separates from the first welded pipe, and then the first welded pipe and the second welded pipe after welding are pulled out as a whole.

[0031] The beneficial effects achieved by the present invention using the above structure are as follows:

[0032] (1) By using the elastic limit of the elastic pre-clamping plate, the relative position of the pre-clamping pipe and the first welded pipe can be kept stationary when the clamping screw block does not clamp the first welded pipe, thereby ensuring that the position of the first welded pipe will not shift twice during the clamping and locking process.

[0033] (2) By means of the threaded connection on the two inclined surfaces of the clamping screw block and the internal thread, the coiling sleeve can move closer or further away from the clamping screw block and the first welded pipe during rotation, thereby achieving clamping and fixing or unlocking and releasing of the first welded pipe.

[0034] (3) The planetary gear set has two drive modes that can be automatically switched. During the continuous rotation of the drive motor, the first welded pipe can be clamped and fixed first, and after the fixing is completed, the first welded pipe will be automatically rotated together by the clamp.

[0035] (4) The unidirectional rotation component can not only limit the rotation direction of the pre-clamped tube and provide the necessary preconditions for unlocking when reversing, but also use the compression amplitude of the status sensing switch to feedback the swing amplitude of the swing pin, thereby determining the number of ratchet teeth passed by the pawl and controlling the automatic start and stop of the welding head.

[0036] (5) The feeder has a guide wheel inside that rolls in contact with the second welded pipe. The roller inside the feeder has the ability to drive the second welded pipe to move axially, but the second welded pipe can rotate freely in the feeder. Attached Figure Description

[0037] Figure 1 This is a perspective view of a welding and assembly apparatus for EGR pipes proposed in this invention;

[0038] Figure 2 This is a front view of a welding assembly apparatus for EGR pipes proposed in this invention;

[0039] Figure 3 This is a left view of a welding assembly apparatus for EGR pipes proposed in this invention;

[0040] Figure 4 for Figure 3 A cross-sectional view along section line AA;

[0041] Figure 5 for Figure 4 A cross-sectional view along the cutting line BB;

[0042] Figure 6 This is an exploded structural diagram of a welding assembly device for EGR pipes proposed in this invention.

[0043] Figure 7 for Figure 4 A magnified view of a section at point I;

[0044] Figure 8 for Figure 4 Enlarged view of a section at point II;

[0045] Figure 9 for Figure 4 Enlarged view of a section at point III;

[0046] Figure 10 for Figure 5 Enlarged view of a section at point IV;

[0047] Figure 11 for Figure 6 A magnified view of section V.

[0048] The components include: 1. Pre-clamping assembly; 2. Retraction clamping assembly; 3. Planetary drive assembly; 4. Unidirectional rotation assembly; 5. Welding assembly; 6. Feeding assembly; 7. Synchronization assembly; 8. First welding pipe; 9. Frame; 11. Pre-clamping tube; 12. Elastic pre-clamping piece; 13. Rotating sleeve; 21. Clamping screw block; 22. Retraction sleeve; 23. Clamping gear ring; 31. Drive motor; 32. Planetary gear set; 33. Drive gear; 34. Rotating gear. 35. Ring, Support base, 41. Internal ratchet ring, 42. Pawl, 43. Swing pin, 44. Status sensor switch, 51. Base plate, 52. Welding head, 53. Frame bracket, 61. Feeder, 62. Second welding pipe, 71. Synchronous bracket, 72. Synchronous wheel, 73. Synchronous shaft, 111. Limit flange, 112. Alternating notch, 131. Guide boss, 211. Elastic part, 221. Guide groove, 222. Internal thread part.

[0049] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0050] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0051] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] like Figures 1-11 As shown, the present invention proposes a welding assembly device for EGR pipes, including a pre-clamping assembly 1, a gathering clamping assembly 2, a planetary drive assembly 3, a unidirectional rotation assembly 4, a welding assembly 5, a feeding assembly 6, a synchronization assembly 7, a first welding pipe 8, and a frame 9. The pre-clamping assembly 1 is rotatably disposed in the planetary drive assembly 3, the gathering clamping assembly 2 is rotatably disposed on the pre-clamping assembly 1, the planetary drive assembly 3 is disposed in the welding assembly 5, the unidirectional rotation assembly 4 is disposed at one end of the planetary drive assembly 3, the welding assembly 5 and the feeding assembly 6 are disposed on the frame 9, the synchronization assembly 7 is disposed on one side of the welding assembly 5, and the first welding pipe 8 is located in the pre-clamping assembly 1.

[0053] The clamping and fixing of the first welded pipe 8 can be achieved by the relative rotation of the clamping assembly 2 and the pre-clamping assembly 1.

[0054] The pre-clamping assembly 1 includes a pre-clamping tube 11, elastic pre-clamping pieces 12, and a rotating sleeve 13. One end of the pre-clamping tube 11 is provided with a limiting flange 111 and a clearance notch 112. The elastic pre-clamping pieces 12 are evenly distributed in a ring on the inner wall of the pre-clamping tube 11. The first welded pipe 8 is located in the elastic pre-clamping pieces 12. The rotating sleeve 13 is rotatably mounted on the pre-clamping tube 11. Guide bosses 131 are evenly distributed in a ring on the rotating sleeve 13.

[0055] By using the elastic pre-clamping piece 12 to limit the movement, the relative positions of the pre-clamping pipe 11 and the first welded pipe 8 can be kept stationary when the clamping screw block 21 does not clamp the first welded pipe 8, thereby ensuring that the position of the first welded pipe 8 will not shift secondary during the clamping and locking process.

[0056] The clamping assembly 2 includes a clamping screw block 21, a clamping sleeve 22, and a clamping gear ring 23. The clamping screw block 21 is provided with an elastic part 211 and is disposed in the clearance notch 112 through the elastic part 211. The inner wall of the clamping sleeve 22 is provided with a guide groove 221 that matches the guide boss 131. The clamping sleeve 22 is engaged and slidably disposed on the rotating sleeve 13. The end of the clamping sleeve 22 is provided with an internal thread 222 that matches the clamping screw block 21. The clamping gear ring 23 is fixedly connected to the rotating sleeve 13.

[0057] By means of the threaded connection on the two inclined surfaces of the clamping screw block 21 and the internal thread part 222, the tightening sleeve 22 can move closer or further away from the clamping screw block 21 and the first welded pipe 8 during rotation, thereby achieving clamping and fixing or unlocking and releasing of the first welded pipe 8.

[0058] The planetary drive assembly 3 includes a drive gear 33, a rotating gear ring 34, and a support base 35. The support base 35 is mounted on the welding assembly 5. The clamping gear ring 23 and the rotating gear ring 34 are rotatably mounted in the support base 35. The drive gear 33 and the clamping gear ring 23 mesh and transmit power. The rotating gear ring 34 is fixedly connected to the pre-clamping tube 11.

[0059] The planetary drive assembly 3 also includes a drive motor 31 and a planetary gear set 32. The drive motor 31 and the pawl 42 are both located in the feeding assembly 6 of the planetary drive assembly 3. The input shaft of the planetary gear set 32 ​​is connected to the drive shaft of the drive motor 31. The drive gear 33 is located on the output shaft of the planetary gear set 32. The outer gear ring of the planetary gear set 32 ​​meshes with the rotating gear ring 34 for transmission.

[0060] The planetary gear set 32 ​​has two drive modes that can be automatically switched. During the continuous rotation of the drive motor 31, it can first clamp and fix the first welded pipe 8, and after the fixing is completed, it automatically drives the first welded pipe 8 to rotate together through the clamp.

[0061] The one-way rotating assembly 4 includes an inner ratchet ring 41, a pawl 42, a swing pin 43, and a status sensing switch 44. The inner ratchet ring 41 is rotatably mounted in the support base 35. The swing pin 43 is fixedly connected to the rotating ring 34. The pawl 42 is hinged to the swing pin 43. The fixed part of the status sensing switch 44 is located on the rotating ring 34. The pawl 42 abuts against the moving part of the status sensing switch 44.

[0062] The unidirectional rotation component 4 can not only limit the rotation direction of the pre-clamping tube 11 and provide the necessary preconditions for unlocking during reversal, but also use the compression amplitude of the status sensing switch 44 to feedback the swing amplitude of the swing pin 43, thereby determining the number of ratchet teeth passed by the pawl 42 and controlling the automatic start and stop of the welding head 52.

[0063] The welding assembly 5 includes a base plate 51, a welding head 52, and a frame bracket 53. The welding head 52 is located on the base plate 51, the support base 35 is located on the base plate 51, and the frame bracket 53 is located on the base plate 51.

[0064] The feeding assembly 6 includes a feeder 61 and a second welding pipe 62. The feeder 61 is mounted on the frame 9, and the second welding pipe 62 is located in the feeder 61.

[0065] The feeder 61 has a guide wheel inside that rolls into contact with the second welding pipe 62. The roller inside the feeder 61 has the ability to drive the second welding pipe 62 to move axially, but the second welding pipe 62 can rotate freely in the feeder 61.

[0066] The synchronization component 7 includes a synchronization bracket 71, a synchronization wheel 72, and a synchronization shaft 73. The synchronization bracket 71 is fixed to the side of the welding head 52, the synchronization shaft 73 is rotatably disposed in the synchronization bracket 71, the synchronization wheel 72 is fixed to the synchronization shaft 73, the synchronization shaft 73 has rolling contact with the first welding pipe 8, and the synchronization shaft 73 has rolling contact with the second welding pipe 62.

[0067] In practical use, the user first needs to feed the second welded pipe 62 to the designated position through the feeder 61. The rollers inside the feeder 61 have the ability to drive the second welded pipe 62 to move axially, but the second welded pipe 62 can rotate freely in the feeder 61. Then, the first welded pipe 8 is inserted into the pre-clamping tube 11 and axially positioned by the limiting flange 111. The first welded pipe 8 is elastically pre-clamped by the elastic pre-clamping piece 12, so that it is temporarily stationary relative to the pre-clamping tube 11. At this time, the first welded pipe 8 and the second welded pipe 62 are in contact, and the welding head 52 is located below the joint between the two.

[0068] Then, the drive motor 31 is started and drives the input shaft of the planetary gear set 32 ​​to rotate. Since there is a large rotational resistance between the rotating gear ring 34 and the support seat 35, and there is also resistance when the pawl 42 slides along the inner ratchet ring 41, the outer gear ring and the rotating gear ring 34 of the planetary gear set 32 ​​will remain stationary in the initial state. The drive motor 31 drives the planet carrier of the planetary gear set 32 ​​to rotate, and then drives the rotating sleeve 13 to rotate through the drive gear 33 and the clamping gear ring 23.

[0069] As the rotating sleeve 13 drives the coiling sleeve 22 to rotate, the coiling sleeve 22 will slide laterally relative to the rotating sleeve 13 due to the threaded connection between the internal thread 222 and the clamping screw block 21. As the coiling sleeve 22 moves closer to the limiting flange 111, the clamping screw block 21 will gradually contract and squeeze the first welded pipe 8, thus completing the clamping and fixing between the pre-clamped pipe 11 and the first welded pipe 8.

[0070] After the first welded pipe 8 is clamped, it will be coaxial with the pre-clamped pipe 11. At this time, the wheel rims at both ends of the synchronous wheel 72 will abut against the first welded pipe 8 and the second welded pipe 62 respectively. The diameter of the middle position of the synchronous wheel 72 is small to avoid interference with the weld.

[0071] After the clamping screw block 21 presses against the first welded pipe 8, the rotating sleeve 13 and the pre-clamping pipe 11 cannot rotate relative to each other. At this time, the pre-clamping pipe 11 and the rotating sleeve 13 rotate synchronously as a whole. During this stage, the planetary gear set 32 ​​also acts as a whole. The planet carrier of the planetary gear set 32 ​​drives the clamping gear ring 23 to rotate through the drive gear 33. The outer gear ring of the planetary gear set 32 ​​drives the rotating gear ring 34 to rotate. At this time, the first welded pipe 8 gradually rotates while maintaining the clamping state.

[0072] At this time, since both the first welding pipe 8 and the second welding pipe 62 are in rolling contact with the synchronous wheel 72, the first welding pipe 8 will rotate while the second welding pipe 62 rotates together.

[0073] When the pre-clamping tube 11 is not rotating, the pawl 42 is located at the deepest part of the inner ratchet ring 41. At this time, the status sensing switch 44 is in the off state. When the pre-clamping tube 11 starts to rotate, the end of the pawl 42 slides along the ratchet surface of the inner ratchet ring 41. The status sensing switch 44 changes from the off state to the on state under the pressure of the pawl 42.

[0074] As the pre-clamping tube 11 rotates continuously, during the process of the pawl 42 disengaging from one ratchet tooth and contacting the next ratchet tooth, the compression amplitude of the status sensing switch 44 will change, but it will still remain in the on state. When the status sensing switch 44 is in the on state, the welding head 52 starts to weld the first welding pipe 8 and the second welding pipe 62. Welding can be completed after the pre-clamping tube 11 rotates one revolution. Because the number of ratchet teeth in the inner ratchet ring 41 is fixed, the rotation angle of the pre-clamping tube 11 can be fed back through the periodic change of the compression amplitude of the status sensing switch 44.

[0075] After welding is completed, the drive motor 31 reverses. First, the pre-clamping tube 11 will reverse slightly until the pawl 42 abuts against the deepest part of the ratchet of the inner ratchet ring 41. At this time, the status sensing switch 44 changes from the on state to the off state, and the pre-clamping tube 11 can no longer rotate.

[0076] Then the drive motor 31 continues to rotate, the outer gear ring of the planetary gear set 32 ​​remains stationary like the pre-clamping tube 11, the planet carrier of the planetary gear set 32 ​​drives the rotating sleeve 13 to rotate in the opposite direction through the drive gear 33 and the clamping gear ring 23, the clamping screw block 21 gradually separates from the first welded pipe 8, and then the first welded pipe 8 and the second welded pipe 62 after welding are pulled out as a whole.

[0077] As another new embodiment of the present invention, the number of unidirectional rotating components 4 can be arranged in a ring evenly in several groups, but only one group of unidirectional rotating components 4 needs to have a status sensing switch 44, and the status sensing switches 44 in the other unidirectional rotating components 4 can be replaced with ordinary springs.

[0078] As another new embodiment of the present invention, the clamping assembly 2 and the planetary drive assembly 3 can also be replaced with a structure similar to a three-rotor chuck, in which the disk is driven to rotate by gears. Before the jaws abut against the workpiece, the chuck does not rotate and the jaws continue to extend; after the jaws abut against the workpiece, the jaws stop extending and the chuck and the workpiece rotate together as a whole.

[0079] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0080] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A welding assembly apparatus for EGR pipes, comprising a welding assembly (5), a feeding assembly (6), and a frame (9), characterized in that: It also includes a pre-clamping assembly (1), a convergence clamping assembly (2), a planetary drive assembly (3), a unidirectional rotation assembly (4), a synchronization assembly (7), and a first welding pipe (8). The pre-clamping assembly (1) is rotatably disposed in the planetary drive assembly (3), the convergence clamping assembly (2) is rotatably disposed on the pre-clamping assembly (1), the planetary drive assembly (3) is disposed in the welding assembly (5), the unidirectional rotation assembly (4) is disposed at one end of the planetary drive assembly (3), the welding assembly (5) and the feeding assembly (6) are disposed on the frame (9), the synchronization assembly (7) is disposed on one side of the welding assembly (5), and the first welding pipe (8) is located in the pre-clamping assembly (1); The clamping and fixing of the first welded pipe (8) can be achieved by the relative rotation of the clamping assembly (2) and the pre-clamping assembly (1).

2. The welding assembly apparatus for EGR pipes according to claim 1, characterized in that: The pre-clamping assembly (1) includes: A pre-clamping tube (11) is provided at one end with a limiting flange (111) and a clearance notch (112). Elastic pre-clamping pieces (12) are evenly distributed in a ring on the inner wall of the pre-clamping tube (11), and the first welded pipe (8) is located in the elastic pre-clamping pieces (12). Rotary sleeve (13), which is rotatably mounted on pre-clamping tube (11), and guide bosses (131) are evenly distributed in a ring on the rotating sleeve (13).

3. The welding assembly apparatus for EGR pipes according to claim 2, characterized in that: The planetary drive assembly (3) includes: A rotating gear ring (34) and a support base (35) are provided on the welding assembly (5), and the rotating gear ring (34) is rotatably disposed in the support base (35). A drive gear (33) meshes with a clamping gear ring (23), and the rotating gear ring (34) is fixed to the pre-clamping tube (11).

4. The welding assembly apparatus for EGR pipes according to claim 3, characterized in that: The unidirectional rotation component (4) includes: An internal ratchet ring (41) is rotatably mounted in a support base (35). A pawl (42) and a pivot pin (43), wherein the pivot pin (43) is fixed to a rotating gear ring (34), and the pawl (42) is hinged to the pivot pin (43). A status sensor switch (44) is fixed on a rotating gear ring (34), and a pawl (42) abuts against the moving part of the status sensor switch (44).

5. The welding assembly apparatus for EGR pipes according to claim 4, characterized in that: The gathering clamping assembly (2) includes a clamping screw block (21), a gathering sleeve (22), and a clamping toothed ring (23). The clamping screw block (21) is provided with an elastic part (211), and the clamping screw block (21) is provided in the clearance notch (112) through the elastic part (211). The inner wall of the gathering sleeve (22) is provided with a guide groove (221) that matches the guide boss (131). The gathering sleeve (22) is engaged and slidably disposed on the rotating sleeve (13). The end of the gathering sleeve (22) is provided with an internal thread (222) that matches the clamping screw block (21). The clamping tooth ring (23) is fixedly connected to the rotating sleeve (13). The clamping tooth ring (23) is rotatably disposed in the support seat (35).

6. The welding assembly apparatus for EGR pipes according to claim 5, characterized in that: The planetary drive assembly (3) also includes a drive motor (31) and a planetary gear set (32). The drive motor (31) and the pawl (42) are both located in the feeding assembly (6) of the planetary drive assembly (3). The input shaft of the planetary gear set (32) is connected to the drive shaft of the drive motor (31). The drive gear (33) is located on the output shaft of the planetary gear set (32). The outer gear ring of the planetary gear set (32) meshes with the rotating gear ring (34) for transmission.

7. The welding assembly apparatus for EGR pipes according to claim 6, characterized in that: The welding assembly (5) includes a base plate (51), a welding head (52) and a frame bracket (53). The welding head (52) is located on the base plate (51), the support base (35) is located on the base plate (51), and the frame bracket (53) is located on the base plate (51).

8. The welding assembly apparatus for EGR pipes according to claim 7, characterized in that: The feeding assembly (6) includes a feeder (61) and a second welding pipe (62). The feeder (61) is mounted on the frame (9), and the second welding pipe (62) is located in the feeder (61).

9. A welding assembly apparatus for EGR pipes according to claim 8, characterized in that: The synchronization component (7) includes a synchronization bracket (71), a synchronization wheel (72), and a synchronization shaft (73). The synchronization bracket (71) is fixed to the side of the welding head (52). The synchronization shaft (73) is rotatably disposed in the synchronization bracket (71). The synchronization wheel (72) is fixed to the synchronization shaft (73). The synchronization shaft (73) is in rolling contact with the first welding pipe (8) and the synchronization shaft (73) is in rolling contact with the second welding pipe (62).

10. A method of using the welding assembly apparatus for EGR pipes according to claim 9, characterized in that, Includes the following steps: Step 1: First, the second welded pipe (62) is transported to the designated position by the feeder (61). The second welded pipe (62) can rotate freely in the feeder (61). Then, the first welded pipe (8) is inserted into the pre-clamping pipe (11) and axially positioned by the limiting flange (111). The first welded pipe (8) is elastically pre-clamped by the elastic pre-clamping piece (12). At this time, the first welded pipe (8) and the second welded pipe (62) abut against each other, and the welding head (52) is located below the joint between the two. Step 2: Start the drive motor (31) and drive the input shaft of the planetary gear set (32) to rotate. In the initial state, the outer gear ring and the rotating gear ring (34) of the planetary gear set (32) will remain stationary. The drive motor (31) drives the planet carrier of the planetary gear set (32) to rotate, and then drives the rotating sleeve (13) to rotate through the drive gear (33) and the clamping gear ring (23). As the rotating sleeve (13) drives the coiling sleeve (22) to rotate, due to the threaded connection between the internal thread (222) and the clamping screw block (21), the coiling sleeve (22) will slide laterally relative to the rotating sleeve (13). As the coiling sleeve (22) approaches the limiting flange (111), the clamping screw block (21) will gradually shrink and squeeze the first welded pipe (8), thus completing the fixation between the pre-clamped pipe (11) and the first welded pipe (8). Step 3: After the first welded pipe (8) is fixed, it will be coaxial with the pre-clamping pipe (11). At this time, the wheel rims at both ends of the synchronous pulley (72) will abut against the first welded pipe (8) and the second welded pipe (62) respectively. Step 4: After the clamping screw block (21) abuts against the first welded pipe (8), the rotating sleeve (13) and the pre-clamping pipe (11) cannot rotate relative to each other. At this time, the pre-clamping pipe (11) and the rotating sleeve (13) rotate synchronously as a whole. In this stage, the planetary gear set (32) also acts as a whole. The planet carrier of the planetary gear set (32) drives the clamping gear ring (23) to rotate through the drive gear (33). The outer gear ring of the planetary gear set (32) drives the rotating gear ring (34) to rotate. At this time, the first welded pipe (8) also gradually rotates. Step 5: At this time, since both the first welding pipe (8) and the second welding pipe (62) are in rolling contact with the synchronous wheel (72), the first welding pipe (8) will rotate while the second welding pipe (62) rotates together; Step 6: When the pre-clamping tube (11) is not rotating, the pawl (42) is located at the deepest part of the inner ratchet ring (41). At this time, the status sensor switch (44) is in the off state. When the pre-clamping tube (11) starts to rotate, the end of the pawl (42) slides along the ratchet surface of the inner ratchet ring (41). The status sensor switch (44) changes from the off state to the on state under the pressure of the pawl (42). When the pre-clamping tube (11) rotates continuously, during the process of the pawl (42) disengaging from one ratchet tooth and contacting the next ratchet tooth, the compression amplitude of the state sensing switch (44) will change, but it will still remain in the on state. When the state sensing switch (44) is in the on state, the welding head (52) is started to weld the first welding pipe (8) and the second welding pipe (62). The welding can be completed after the pre-clamping tube (11) rotates one revolution. Step 7: After welding is completed, the drive motor (31) reverses. First, the pre-clamping tube (11) will reverse until the pawl (42) abuts against the deepest part of the ratchet of the inner ratchet ring (41). At this time, the status sensor switch (44) changes from the on state to the off state, and the pre-clamping tube (11) can no longer rotate. Then the drive motor (31) continues to rotate, the outer gear ring of the planetary gear set (32) remains stationary like the pre-clamping tube (11), the planet carrier of the planetary gear set (32) drives the rotating sleeve (13) to rotate in the opposite direction through the drive gear (33) and the clamping gear ring (23), the clamping screw block (21) gradually separates from the first welded pipe (8), and then the first welded pipe (8) and the second welded pipe (62) after welding are pulled out as a whole.

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