Adjustable welding device and welding method for automobile exhaust pipe

Abstract

The present invention discloses an adjustable welding device for automobile exhaust pipes and a welding method thereof, which relates to the technical field of automobile exhaust pipe welding. In order to solve the problem that the existing device, during use, adopts the method of positioning the pipeline and driving the pipeline to rotate to complete the welding work, when welding the bent pipe, the deflection range of the bent part of the pipeline is large, there are limitations, resulting in inconvenience in processing, and the device lacks a loading and unloading mechanism, which affects the processing efficiency. A straight pipe loading platform is arranged at the rear end of the annular welding mechanism, and a straight pipe loader is installed on one side of the straight pipe loading platform; a bent pipe loading platform is arranged at the front end of the annular welding mechanism, and a first electric guide rail is embedded in the interior of the bent pipe loading platform; a transfer mechanism is installed on the slider of the first electric guide rail.

Description

Technical Field

[0001] The invention relates to the technical field of automobile exhaust pipe welding, in particular to an adjustable welding device for an automobile exhaust pipe and a welding method thereof. Background Art

[0002] During the production process of automobile exhaust pipes, welding equipment is required to weld two raw material pipes;

[0003] For example, the application number CN113103082A is named a post-processing equipment and post-processing method for automobile exhaust pipe welding, which includes a base, a fixing device and a grinding device. The lower end of the base is connected to the existing ground, and the upper end of the base is equipped with a fixing device and a grinding device in sequence from front to back. The present invention can fix the automobile exhaust pipe through the cooperation between the fixing ring, the limit bolt and the arc block to prevent the automobile exhaust pipe from being offset and shaking during the grinding process after welding, and the distance between the arc blocks can be adjusted by adjusting the limit bolt, so that the equipment can fix exhaust pipes of different diameters, and then grind exhaust pipes of different diameters.

[0004] Since the automobile exhaust pipe consists of two parts, a bent pipe and a straight pipe, the above-mentioned device, during use, adopts the method of positioning the pipe and driving the pipe to rotate to complete the welding work. When welding the bent pipe, the deflection range of the bent part of the pipe is large, which is limited, resulting in inconvenience in processing, and the device lacks a loading and unloading mechanism, which affects the processing efficiency. Therefore, we propose an adjustable welding device and a welding method for automobile exhaust pipes to solve the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide an adjustable welding device and a welding method for automobile exhaust pipes, so as to solve the problem that the existing device proposed in the above background technology adopts the method of positioning the pipe and driving the pipe to rotate during use to complete the welding work. When welding the bent pipe, the deflection range of the bent part of the pipe is large and there are limitations, which makes the processing inconvenient, and the device lacks a loading and unloading mechanism, which affects the processing efficiency.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: an adjustable welding device for automobile exhaust pipe, comprising a ring welding mechanism;

[0007] Also includes:

[0008] A straight tube loading platform is arranged at the rear end of the annular welding mechanism, and a straight tube loading machine is installed on one side of the straight tube loading platform;

[0009] A bent pipe loading platform, which is arranged at the front end of the annular welding mechanism, and a first electric guide rail is embedded in the interior of the bent pipe loading platform;

[0010] A transfer mechanism, which is mounted on a slider of the first electric guide rail;

[0011] A bent pipe loading machine, which is installed on one side of the front end of the bent pipe loading platform;

[0012] A feeder is installed on the other side of the front end of the bent pipe loading platform. The lower ends of the bent pipe loading machine and the feeder are both installed with bases, and the bases are fixedly connected by a connecting bottom plate.

[0013] Preferably, cylinder platforms are installed at both ends of both sides of the bending pipe loading machine and the unloading machine, a first cylinder is installed at the upper end of the cylinder platform, and a mesh limiting plate is installed at the output end of the first cylinder.

[0014] Preferably, a first pulley is installed at one end inside the bending pipe loading machine and the unloading machine, and a second pulley is installed at the other end inside the bending pipe loading machine and the unloading machine, the first pulley is connected to the second pulley through a conveyor belt, and partition blocks are equidistantly arranged on the outside of the conveyor belt, and the partition blocks are integrally formed with the conveyor belt, and a stepper motor is installed on the outer wall of one end of the bending pipe loading machine and the unloading machine, and the output end of the stepper motor is connected to the first pulley.

[0015] Preferably, a plurality of negative pressure adsorption holes are provided on the outer wall of the conveyor belt, a negative pressure chamber partition is installed inside the bending pipe loader and the unloader, a negative pressure cavity is provided between the negative pressure chamber partition and the conveyor belt, a roller is provided inside the negative pressure cavity, and a negative pressure pipe joint is provided on one side of the bending pipe loader and the unloader, and three negative pressure pipe joints are provided.

[0016] Preferably, the transfer mechanism includes a sliding bottom plate, a side support plate and a top plate, the sliding bottom plate is installed on the slider of the first electric guide rail, the side support plates are installed on both sides of the upper end of the sliding bottom plate, and the top plate is installed on the upper end of the side support plate. Second cylinders are installed on the outer walls of the side support plates on both sides, the output end of the second cylinder passes through and extends to the interior of the side support plate, and is installed with a splint, a flexible rubber pad is provided on the outer wall of the splint, and a plurality of second balls are provided on the upper surface of the sliding bottom plate.

[0017] Preferably, an extension plate is provided at the rear end of the top plate, a hydraulic telescopic rod is installed at the upper end of the extension plate, the output end of the hydraulic telescopic rod passes through the lower end of the extension plate and is installed with a limit rod, and a laser sensor is installed below the rear end of the extension plate.

[0018] Preferably, a hydraulic cylinder mounting plate is installed at the rear end of the straight tube loading platform, and a first hydraulic cylinder is installed at the rear end of the hydraulic cylinder mounting plate. The output end of the first hydraulic cylinder passes through and extends to the front end of the hydraulic cylinder mounting plate, and is installed with a push plate. A plurality of first balls are installed on the lower surface of the push plate. Arc-shaped guide strips are provided on both sides of the upper surface of the straight tube loading platform, and a guide column is installed below the rear end of the push plate, and one end of the guide column passes through and extends to the outside of the hydraulic cylinder mounting plate.

[0019] Preferably, an inner ring frame is provided inside the annular welding mechanism, a bearing is provided at the connection between the inner ring frame and the annular welding mechanism, a rack is provided on the outer wall of the inner ring frame, a gear chamber is installed on one side of the annular welding mechanism, a driving gear is installed inside the gear chamber, and the driving gear is meshed and transmission-connected with the rack on the outer wall of the inner ring frame, a second electric guide rail is installed on the inner wall of the inner ring frame, a second hydraulic cylinder is installed on the output end of the second electric guide rail, and a welding head is installed on the output end of the second hydraulic cylinder.

[0020] Preferably, a support plate is installed at the connection between the output end of the second hydraulic cylinder and the welding head, an electric push rod is installed above the rear end of the support plate, a spring is installed on the output end of the electric push rod, a damping rod is installed inside the spring, and an ultrasonic welding probe is installed at one end of the spring.

[0021] Preferably, the welding method of the automobile exhaust pipe with an adjustable welding device comprises the following steps:

[0022] Step 1: Place the bent pipe part and the straight pipe part of the exhaust pipe on the bent pipe feeder and the straight pipe feeder respectively by manual or mechanical hands. When feeding the bent pipes, place the bent part of each bent pipe against the partition block of the conveyor belt, and drive the mesh limit plates on both sides of the bent pipe feeder to extend to limit the bent pipes;

[0023] Step 2: During transportation, the straight tube feeder steps forward and feeds a section of the straight tube to the space between the two arc-shaped guide strips and then waits for its position. The bent tube feeder is connected to an external negative pressure mechanism to generate negative pressure in the internal negative pressure chamber, and absorbs the bent tube through the negative pressure absorption holes on the conveyor belt. When the bent tube reaches the edge of the conveyor belt, it leaves the negative pressure chamber range, continues to be transported forward, and moves to the transfer mechanism.

[0024] Step 3: When the bent pipe is transferred to the transfer mechanism, the laser sensor at the rear end of the mechanism can detect the approach of the pipe. When the pipe leaves the detection range of the laser sensor, it means that the transfer mechanism successfully receives the bent pipe. At this time, the laser sensor sends a signal to the controller to drive the second cylinders on both sides of the mechanism and the hydraulic telescopic rod on the top to operate. The second cylinder drives the clamp to extend and clamp the bent pipe, and the hydraulic telescopic rod drives the limit rod to extend to limit the rear end of the bent pipe.

[0025] Step 4: After the limiting is completed, the first electric guide rail at the bottom of the transfer mechanism is driven to drive the bent pipe to move to the front end of the annular welding mechanism on the left. After completion, the first hydraulic cylinder at the rear end of the straight pipe loading platform is driven to drive the push plate to extend, and push the straight pipe to be positioned to the annular welding mechanism, so that one end of the straight pipe is pressed against the butt end of the bent pipe;

[0026] Step 5: After both the straight pipe and the bent pipe reach the welding position, the second electric guide rail on the inner wall of the annular welding mechanism is driven back and forth, and at the same time, the second hydraulic cylinder and the electric push rod are operated, first driving the ultrasonic weld probe to move down, attach to the pipe, and identify the weld position. After the identification is completed, the electric push rod retracts, driving the ultrasonic weld probe to withdraw, and the second electric guide rail continues to drive, driving the welding head to move to the weld position;

[0027] Step 6: The motor drives the active gear to mesh with the rack on the inner ring frame of the annular welding mechanism, driving the welding head to rotate one circle to weld the joints of the curved pipe and the straight pipe. After completion, the hydraulic telescopic rod at the upper end of the transfer mechanism drives the limit rod to retract, and at the same time, the second cylinder on the side drives the clamping plate to move slightly backward, only limiting the side of the pipe, and then the first hydraulic cylinder continues to drive the push plate forward to push the welded pipe to the unloading machine for unloading. After completion, each mechanism is reset, and this process is repeated to complete the welding of the automobile exhaust pipe in an orderly manner.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The welding process of the present invention is completed by an annular welding mechanism. During welding, the curved pipe section is positioned by the pressure plates on both sides of the transfer mechanism and the limit rod at the rear end, and the straight pipe is pressed and fixed with the curved pipe section by a hydraulically driven push plate, thereby ensuring the welding stability. During welding, the motor drives the active gear to run, and meshes with the rack on the inner ring frame of the annular welding mechanism to drive the welding head to rotate one circle, and the connection between the curved pipe and the straight pipe is welded. During the process, the straight pipe and the curved pipe themselves do not need to rotate, thereby ensuring the welding accuracy. This solves the problem that the existing device, during use, adopts the method of positioning the pipeline and driving the pipeline to rotate to complete the welding work. When welding the curved pipe, the deflection range of the curved part of the pipeline is large, which is limited, resulting in inconvenient processing.

[0030] 2. By setting a bent pipe loader, a transfer mechanism, a straight pipe loader and a blanking machine, when the device is in operation, the bent pipe part and the straight pipe part of the exhaust pipe are placed on the bent pipe loader and the straight pipe loader respectively by manual or mechanical arms, wherein the straight pipe loader steps forward to transport the straight pipe section to a waiting position between two arc-shaped guide strips, and the bent pipe loader is externally connected to a negative pressure mechanism, which relies on the negative pressure to stably transfer the bent pipe to the transfer mechanism, and then the transfer mechanism and the push plate respectively move the bent pipe and the straight pipe to the annular welding mechanism. After welding is completed, the push plate continues to advance to push the welded pipe into the blanking machine. The two conveying lines for loading and unloading are arranged in parallel, with high space utilization, reducing the overall footprint of the welding device, and can complete the loading and unloading work in an orderly manner, with a high degree of automation, solving the problem that the existing welding device lacks loading and unloading mechanisms, affecting the processing efficiency.

[0031] 3. By setting mesh limit plates driven by cylinders on both sides of the bending pipe loader and unloader, and using hydraulic cylinders to connect the welding heads, the settings of the cylinders and hydraulic cylinders can flexibly adjust the spacing of the mesh limit plates and the distance between the welding heads and the pipes, so that the welding device has a certain degree of adjustability and is suitable for welding of automobile exhaust pipes of various specifications and sizes, thereby improving versatility.

[0032] 4. By setting an ultrasonic weld probe controlled by an electric push rod at the rear end of the welding head, when the pipeline enters the welding range, the second electric guide rail on the inner wall of the annular welding mechanism is driven back and forth, and the electric push rod runs at the same time, driving the ultrasonic weld probe to move down and stick to the pipeline, quickly identifying the weld position and improving the subsequent welding accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 It is a schematic diagram of the internal structure of the bending pipe loading machine and the unloading machine of the present invention;

[0035] Figure 3 It is a partial structural schematic diagram of the bending pipe loading machine and the unloading machine of the present invention;

[0036] Figure 4 It is a schematic diagram of the structure of the bent pipe loading platform and the annular welding mechanism of the present invention;

[0037] Figure 5 It is a schematic diagram of the internal structure of the annular welding mechanism of the present invention;

[0038] Figure 6 It is a schematic diagram of the side structure of the welding head of the present invention;

[0039] Figure 7 This is a schematic diagram of the structure of the straight tube loading platform of the present invention;

[0040] Figure 8 It is a schematic diagram of the bottom surface structure of the push plate of the present invention;

[0041] In the figure: 1. Bending pipe loading machine; 2. Unloading machine; 3. Bending pipe loading platform; 4. Ring welding mechanism; 5. Straight pipe loading platform; 6. Straight pipe loading machine; 7. Base; 8. Connecting bottom plate; 9. Conveying belt; 10. Stepping motor; 11. Cylinder carrier; 12. First cylinder; 13. Mesh limit plate; 14. First electric guide rail; 15. Transfer mechanism; 16. Hydraulic cylinder mounting plate; 17. First hydraulic cylinder; 18. Push plate; 181. First ball bearing; 19. First pulley; 20. Second pulley; 21. Negative pressure chamber partition; 22. Negative pressure chamber; 23. Roller; 24. Separator; 25. Negative pressure adsorption hole; 26, negative pressure pipe joint; 27, sliding bottom plate; 28, second ball; 29, side support plate; 30, second cylinder; 31, clamping plate; 32, flexible rubber pad; 33, top plate; 34, extension plate; 35, hydraulic telescopic rod; 36, laser sensor; 37, inner ring frame; 38, rack; 39, bearing; 40, gear chamber; 41, driving gear; 42, second electric guide rail; 43, second hydraulic cylinder; 44, welding head; 45, support plate; 46, electric push rod; 47, spring; 48, damping rod; 49, ultrasonic welding probe; 50, arc guide strip; 51, guide column. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0043] See also Figure 1-8 , an embodiment provided by the present invention: an adjustable welding device for automobile exhaust pipe, comprising a ring welding mechanism 4;

[0044] Also includes:

[0045] A straight tube loading platform 5 is arranged at the rear end of the annular welding mechanism 4, and a straight tube loading machine 6 is installed on one side of the straight tube loading platform 5;

[0046] The bent pipe loading platform 3 is arranged at the front end of the annular welding mechanism 4, and a first electric guide rail 14 is embedded in the bent pipe loading platform 3;

[0047] A transfer mechanism 15, which is mounted on a slider of the first electric guide rail 14;

[0048] The bent pipe loading machine 1 is installed on one side of the front end of the bent pipe loading platform 3;

[0049] The feeder 2 is installed on the other side of the front end of the bent pipe loading platform 3. Bases 7 are installed at the lower ends of the bent pipe loading platform 1 and the feeder 2. The bases 7 are fixedly connected by a connecting bottom plate 8.

[0050] See also Figure 1 Cylinder platforms 11 are installed at both ends of the bending pipe loading machine 1 and the unloading machine 2. The upper end of the cylinder platform 11 is installed with a first cylinder 12. The output end of the first cylinder 12 is installed with a mesh limiting plate 13. The first cylinder 12 can adjust the spacing of the mesh limiting plate 13 through telescopic action to adapt to the transportation of bending pipes of different specifications.

[0051] See also Figure 1 and Figure 2 A first pulley 19 is installed at one end of the bending tube loading machine 1 and the unloading machine 2, and a second pulley 20 is installed at the other end of the bending tube loading machine 1 and the unloading machine 2. The first pulley 19 is connected to the second pulley 20 through a conveyor belt 9. The outside of the conveyor belt 9 is equidistantly provided with partition blocks 24, and the partition blocks 24 are integrally formed with the conveyor belt 9. A stepper motor 10 is installed on the outer wall of one end of the bending tube loading machine 1 and the unloading machine 2, and the output end of the stepper motor 10 is connected to the first pulley 19. The setting of the partition block 24, on the one hand, when placing the bent tube, the bent part of the bent tube can be easily leaned on, thereby improving a certain stability. On the other hand, it can ensure the spacing between each bent tube, which is convenient for subsequent mechanical interval loading.

[0052] See also Figure 2 and Figure 3 A plurality of negative pressure adsorption holes 25 are arranged on the outer wall of the conveyor belt 9, a negative pressure chamber partition 21 is installed inside the bent pipe loader 1 and the unloader 2, a negative pressure chamber 22 is arranged between the negative pressure chamber partition 21 and the conveyor belt 9, and a roller 23 is arranged inside the negative pressure chamber 22. A negative pressure pipe joint 26 is arranged on one side of the bent pipe loader 1 and the unloader 2, and three negative pressure pipe joints 26 are arranged. The roller 23 ensures the bearing capacity of the conveyor belt 9, and a negative pressure chamber 22 is arranged inside it. A negative pressure device can be connected to an external negative pressure device through multiple negative pressure pipe joints 26 to make the negative pressure chamber 22 evenly generate negative pressure. By utilizing the plurality of negative pressure adsorption holes 25 on the conveyor belt 9, the bottom of the bent pipe can be adsorbed during the conveying process to ensure the conveying stability.

[0053] See also Figure 4The transfer mechanism 15 includes a sliding bottom plate 27, a side support plate 29 and a top plate 33. The sliding bottom plate 27 is installed on the slider of the first electric guide rail 14, the side support plates 29 are installed on both sides of the upper end of the sliding bottom plate 27, and the top plate 33 is installed on the upper end of the side support plates 29. Second cylinders 30 are installed on the outer walls of the side support plates 29 on both sides. The output end of the second cylinder 30 passes through and extends to the inside of the side support plates 29, and is installed with a clamping plate 31. A flexible rubber pad 32 is arranged on the outer wall of the clamping plate 31. A plurality of second balls 28 are arranged on the upper surface of the sliding bottom plate 27. The transfer mechanism 15 can receive the bent pipe on the bent pipe loader 1. After receiving it, the second cylinders 30 on both sides can be driven to extend, and the clamping plate 31 is used to position the bent pipe to ensure the stability of movement and subsequent welding. The flexible rubber pad 32 on the outer wall of the clamping plate 31 can avoid wear on the outer wall of the pipeline.

[0054] See also Figure 4 An extension plate 34 is provided at the rear end of the top plate 33, and a hydraulic telescopic rod 35 is installed at the upper end of the extension plate 34. The output end of the hydraulic telescopic rod 35 passes through the lower end of the extension plate 34 and is installed with a limit rod. A laser sensor 36 is installed below the rear end of the extension plate 34. The laser sensor 36 can detect the approach of the pipeline. When the pipeline is out of the detection range of the laser sensor 36, it means that the transfer mechanism 15 successfully takes over the bent pipe. At this time, the laser sensor 36 sends a signal to the controller to drive the limit mechanism to operate.

[0055] See also Figure 7 A hydraulic cylinder mounting plate 16 is installed at the rear end of the straight tube loading platform 5, and a first hydraulic cylinder 17 is installed at the rear end of the hydraulic cylinder mounting plate 16. The output end of the first hydraulic cylinder 17 passes through and extends to the front end of the hydraulic cylinder mounting plate 16, and a push plate 18 is installed. A plurality of first balls 181 are installed on the lower surface of the push plate 18. Arc guide strips 50 are arranged on both sides of the upper surface of the straight tube loading platform 5. A guide column 51 is installed below the rear end of the push plate 18, and one end of the guide column 51 passes through and extends to the outside of the hydraulic cylinder mounting plate 16. The straight tube portion is transported by the straight tube loader 6 to between the two arc guide strips 50 on the surface of the straight tube loading platform 5. The first hydraulic cylinder 17 can drive the push plate 18 to move forward and push the straight tube between the arc guide strips 50 to the annular welding mechanism 4. The first ball 181 at the bottom of the push plate 18 and the guide column 51 at the rear end both improve the stability of its movement process.

[0056] See also Figure 5An inner ring frame 37 is arranged inside the annular welding mechanism 4, a bearing 39 is arranged at the connection between the inner ring frame 37 and the annular welding mechanism 4, a rack 38 is arranged on the outer wall of the inner ring frame 37, a gear chamber 40 is installed on one side of the annular welding mechanism 4, a driving gear 41 is installed inside the gear chamber 40, and the driving gear 41 is meshed and driven with the rack 38 on the outer wall of the inner ring frame 37, a second electric guide rail 42 is installed on the inner wall of the inner ring frame 37, a second hydraulic cylinder 43 is installed on the output end of the second electric guide rail 42, a welding head 44 is installed on the output end of the second hydraulic cylinder 43, before welding, the height of the welding head 44 can be adjusted by the second hydraulic cylinder 43, so that it can be suitable for welding pipes of different diameters, the motor drives the driving gear 41 to run, meshes and drives with the rack 38 on the inner ring frame 37 of the annular welding mechanism 4, and can drive the welding head 44 to rotate one circle, so as to weld the joints of the curved pipe and the straight pipe.

[0057] See also Figure 6 A support plate 45 is installed at the connection between the output end of the second hydraulic cylinder 43 and the welding head 44, and an electric push rod 46 is installed above the rear end of the support plate 45. A spring 47 is installed on the output end of the electric push rod 46, and a damping rod 48 is installed inside the spring 47. An ultrasonic weld probe 49 is installed at one end of the spring 47. The electric push rod 46 can drive the ultrasonic weld probe 49 to move downward to identify the weld. The spring 47 and the damping rod 48 at the upper end of the ultrasonic weld probe 49 give it a certain expansion and contraction space, allowing it to adhere more closely to the pipe wall.

[0058] See also Figure 1-8 , a welding method for an automobile exhaust pipe with an adjustable welding device, comprising the following steps:

[0059] Step 1: manually or mechanically place the bent pipe part and the straight pipe part of the exhaust pipe on the bent pipe feeder 1 and the straight pipe feeder 6 respectively. When feeding the bent pipe, the bent part of each bent pipe is placed against the partition block 24 of the conveyor belt 9, and the mesh limiting plates 13 on both sides of the bent pipe feeder 1 are driven to extend to limit the bent pipe;

[0060] Step 2: During transportation, the straight tube feeder 6 steps forward, transports a section of the straight tube to between the two arc-shaped guide strips 50 and then waits for a position, and the bent tube feeder 1 is externally connected to a negative pressure mechanism, so that the internal negative pressure chamber 22 generates negative pressure, and the bent tube is adsorbed through the negative pressure adsorption holes 25 on the conveyor belt 9. When the bent tube reaches the edge of the conveyor belt 9, it leaves the range of the negative pressure chamber 22, continues to be transported forward, and moves to the transfer mechanism 15;

[0061] Step 3: When the bent pipe is transferred to the transfer mechanism 15, the laser sensor 36 at the rear end of the mechanism can detect the approach of the pipe. When the pipe is out of the detection range of the laser sensor 36, it means that the transfer mechanism 15 successfully receives the bent pipe. At this time, the laser sensor 36 sends a signal to the controller to drive the second cylinders 30 on both sides of the mechanism and the hydraulic telescopic rod 35 on the top to operate. The second cylinder 30 drives the clamping plate 31 to extend and clamp the bent pipe, and the hydraulic telescopic rod 35 drives the limit rod to extend to limit the rear end of the bent pipe.

[0062] Step 4: After the limiting is completed, the first electric guide rail 14 at the bottom of the transfer mechanism 15 is driven to drive the bent pipe to move to the front end of the annular welding mechanism 4 on the left. After completion, the first hydraulic cylinder 17 at the rear end of the straight pipe loading platform 5 is driven to drive the push plate 18 to extend, and push the straight pipe to be positioned to the annular welding mechanism 4, so that one end of the straight pipe is pressed against the butt end of the bent pipe;

[0063] Step 5: After both the straight pipe and the bent pipe have reached the welding position, the second electric guide rail 42 on the inner wall of the annular welding mechanism 4 is driven back and forth, and at the same time, the second hydraulic cylinder 43 and the electric push rod 46 are operated, firstly driving the ultrasonic welding probe 49 to move downward, adhere to the pipe, and identify the welding position. After the identification is completed, the electric push rod 46 retracts, driving the ultrasonic welding probe 49 to withdraw, and the second electric guide rail 42 continues to drive, driving the welding head 44 to move to the welding position;

[0064] Step 6: The motor drives the active gear 41 to run, meshing with the rack 38 on the inner ring frame 37 of the annular welding mechanism 4, driving the welding head 44 to rotate one circle, and welding the joints of the curved pipe and the straight pipe. After completion, the hydraulic telescopic rod 35 at the upper end of the transfer mechanism 15 drives the limit rod to retract, and at the same time, the second cylinder 30 on the side drives the clamping plate 31 to move slightly backward, only limiting the side of the pipeline, and then the first hydraulic cylinder 17 continues to drive the push plate 18 forward to push the welded pipeline to the unloading machine 2 to unload the pipeline. After completion, each mechanism is reset, and this reciprocating process is repeated to complete the welding work of the automobile exhaust pipe in an orderly manner.

[0065] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An adjustable welding device for an automobile exhaust pipe, comprising a ring welding mechanism (4); Features: Also includes: A straight tube loading platform (5) is arranged at the rear end of the annular welding mechanism (4), and a straight tube loading machine (6) is installed on one side of the straight tube loading platform (5); A bent pipe loading platform (3) is arranged at the front end of the annular welding mechanism (4), and a first electric guide rail (14) is embedded in the bent pipe loading platform (3); A transfer mechanism (15) mounted on a slider of the first electric guide rail (14); A bent pipe loading machine (1), which is installed on one side of the front end of the bent pipe loading platform (3); A feeder (2) is installed on the other side of the front end of the bent pipe loading platform (3), and bases (7) are installed at the lower ends of the bent pipe loading platform (1) and the feeder (2), and the bases (7) are fixedly connected via a connecting bottom plate (8); Both ends of the bent pipe loading machine (1) and the unloading machine (2) are equipped with a cylinder platform (11), the upper end of the cylinder platform (11) is equipped with a first cylinder (12), and the output end of the first cylinder (12) is equipped with a mesh limit plate (13); The transfer mechanism (15) comprises a sliding bottom plate (27), a side support plate (29) and a top plate (33), wherein the sliding bottom plate (27) is mounted on a slider of the first electric guide rail (14), the side support plates (29) are mounted on both sides of the upper end of the sliding bottom plate (27), and the top plate (33) is mounted on the upper end of the side support plates (29). Second cylinders (30) are mounted on the outer walls of the side support plates (29) on both sides, and the output end of the second cylinder (30) penetrates and extends to the inside of the side support plates (29) and is mounted with a clamping plate (31), and a flexible rubber pad (32) is arranged on the outer wall of the clamping plate (31), and a plurality of second balls (28) are arranged on the upper surface of the sliding bottom plate (27); An extension plate (34) is provided at the rear end of the top plate (33), a hydraulic telescopic rod (35) is installed at the upper end of the extension plate (34), the output end of the hydraulic telescopic rod (35) passes through the lower end of the extension plate (34) and is installed with a limit rod, and a laser sensor (36) is installed below the rear end of the extension plate (34); A hydraulic cylinder mounting plate (16) is installed at the rear end of the straight tube loading platform (5), and a first hydraulic cylinder (17) is installed at the rear end of the hydraulic cylinder mounting plate (16). The output end of the first hydraulic cylinder (17) passes through and extends to the front end of the hydraulic cylinder mounting plate (16), and is installed with a push plate (18). A plurality of first balls (181) are installed on the lower surface of the push plate (18). Arc-shaped guide strips (50) are provided on both sides of the upper surface of the straight tube loading platform (5), and a guide column (51) is installed below the rear end of the push plate (18), and one end of the guide column (51) passes through and extends to the outside of the hydraulic cylinder mounting plate (16).

2. The adjustable welding device for automobile exhaust pipe according to claim 1, characterized in that: A first pulley (19) is installed at one end of the bending tube loading machine (1) and the blanking machine (2), and a second pulley (20) is installed at the other end of the bending tube loading machine (1) and the blanking machine (2). The first pulley (19) is connected to the second pulley (20) through a conveying belt (9). Spacer blocks (24) are equidistantly arranged outside the conveying belt (9), and the spacer blocks (24) are integrally formed with the conveying belt (9). A stepper motor (10) is installed on the outer wall of one end of the bending tube loading machine (1) and the blanking machine (2), and the output end of the stepper motor (10) is connected to the first pulley (19).

3. The adjustable welding device for automobile exhaust pipe according to claim 2, characterized in that: A plurality of negative pressure adsorption holes (25) are arranged on the outer wall of the conveyor belt (9); a negative pressure chamber partition (21) is installed inside the bending pipe loader (1) and the unloader (2); a negative pressure cavity (22) is arranged between the negative pressure chamber partition (21) and the conveyor belt (9); a roller (23) is arranged inside the negative pressure cavity (22); and a negative pressure pipe joint (26) is arranged on one side of the bending pipe loader (1) and the unloader (2), and three negative pressure pipe joints (26) are arranged.

4. The adjustable welding device for automobile exhaust pipe according to claim 3, characterized in that: An inner ring frame (37) is arranged inside the annular welding mechanism (4), a bearing (39) is arranged at the connection between the inner ring frame (37) and the annular welding mechanism (4), a rack (38) is arranged on the outer wall of the inner ring frame (37), a gear chamber (40) is installed on one side of the annular welding mechanism (4), a driving gear (41) is installed inside the gear chamber (40), and the driving gear (41) is meshed and transmission-connected with the rack (38) on the outer wall of the inner ring frame (37), a second electric guide rail (42) is installed on the inner wall of the inner ring frame (37), a second hydraulic cylinder (43) is installed on the output end of the second electric guide rail (42), and a welding head (44) is installed on the output end of the second hydraulic cylinder (43).

5. The adjustable welding device for automobile exhaust pipe according to claim 4, characterized in that: A support plate (45) is installed at the connection between the output end of the second hydraulic cylinder (43) and the welding head (44), an electric push rod (46) is installed above the rear end of the support plate (45), a spring (47) is installed on the output end of the electric push rod (46), a damping rod (48) is installed inside the spring (47), and an ultrasonic welding probe (49) is installed at one end of the spring (47).

6. The welding method of the adjustable welding device for automobile exhaust pipe according to claim 5, characterized in that: The following steps are involved: Step 1: manually or mechanically placing the bent pipe part and the straight pipe part of the exhaust pipe on a bent pipe loading machine (1) and a straight pipe loading machine (6) respectively. When loading the bent pipes, the bent part of each bent pipe is placed against a partition block (24) of a conveyor belt (9), and the mesh limiting plates (13) on both sides of the bent pipe loading machine (1) are driven to extend to limit the bent pipes. Step 2: During transportation, the straight tube feeding machine (6) steps forward and feeds a section of the straight tube to between the two arc-shaped guide strips (50) and then waits for a position. The bent tube feeding machine (1) is externally connected to a negative pressure mechanism, so that the internal negative pressure chamber (22) generates negative pressure, and the bent tube is adsorbed through the negative pressure adsorption holes (25) on the conveying belt (9). When the bent tube reaches the edge of the conveying belt (9), it leaves the range of the negative pressure chamber (22), continues to be transported forward, and moves to the transfer mechanism (15); Step 3: When the bent pipe is transferred to the transfer mechanism (15), the laser sensor (36) at the rear end of the mechanism can detect that the pipe is approaching. When the pipe is out of the detection range of the laser sensor (36), it means that the transfer mechanism (15) has successfully taken over the bent pipe. At this time, the laser sensor (36) sends a signal to the controller to drive the second cylinders (30) on both sides of the mechanism and the hydraulic telescopic rod (35) on the top to operate. The second cylinder (30) drives the clamping plate (31) to extend and clamp the bent pipe, and the hydraulic telescopic rod (35) drives the limit rod to extend and limit the rear end of the bent pipe. Step 4: After the limiting is completed, the first electric guide rail (14) at the bottom of the transfer mechanism (15) is driven to drive the bent pipe to move to the front end of the annular welding mechanism (4) on the left side. After completion, the first hydraulic cylinder (17) at the rear end of the straight pipe loading platform (5) is driven to drive the push plate (18) to extend, and push the straight pipe to be positioned to the annular welding mechanism (4), so that one end of the straight pipe is pressed against the butt end of the bent pipe; Step 5: After the straight pipe and the curved pipe have both reached the welding position, the second electric guide rail (42) on the inner wall of the annular welding mechanism (4) is driven back and forth, and at the same time, the second hydraulic cylinder (43) and the electric push rod (46) are operated, first driving the ultrasonic welding probe (49) to move downward, adhere to the pipe, and identify the welding position. After the identification is completed, the electric push rod (46) retracts, driving the ultrasonic welding probe (49) to withdraw, and the second electric guide rail (42) continues to drive, driving the welding head (44) to move to the welding position; Step 6: The motor drives the driving gear (41) to run, meshing with the rack (38) on the inner ring frame (37) of the annular welding mechanism (4), driving the welding head (44) to rotate one circle, and welding the joint of the curved pipe and the straight pipe is performed. After completion, the hydraulic telescopic rod (35) at the upper end of the transfer mechanism (15) drives the limit rod to retract, and at the same time, the second cylinder (30) on the side drives the clamping plate (31) to move slightly backward, and only the side of the pipeline is limited. After that, the first hydraulic cylinder (17) continues to drive the push plate (18) to move forward, and the welded pipeline is pushed to the unloading machine (2) to unload the pipeline. After completion, each mechanism is reset, and this reciprocating operation is carried out to orderly complete the welding work of the automobile exhaust pipe.

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