High-frequency welded pipe production equipment for automobile seat structural pipe and use method of high-frequency welded pipe production equipment

Abstract

The invention relates to high-frequency welded pipe production equipment for an automobile seat structural pipe and a using method thereof.The high-frequency welded pipe production equipment comprises a rack, a flattening mechanism, a rolling mechanism, a high-frequency welding mechanism, an outer removing mechanism, a cooling mechanism and a cutting mechanism are arranged at the side end of the rack, and an inner removing mechanism is arranged on the rack and comprises a fixing base; the fixing base is located on the side, close to the flattening mechanism, of an initial station of the roll pressing mechanism, the fixing base is detachably connected with a cutter handle base through a clamping assembly, the cutter handle base is arranged in the length direction of the rack, and a scraper is arranged at the end of the cutter handle base. The scraper extends to the side, close to the external removing mechanism, of a welding head of the high-frequency welding mechanism, and a blade of the scraper abuts against the inner side wall of the pipe blank to remove internal weld beading. The device has the effect of improving the steel pipe production efficiency.

Description

Technical Field

[0001] This application relates to the field of automotive parts manufacturing equipment, and in particular to a high-frequency welded pipe manufacturing equipment for automotive seat structural tubes and its usage method. Background Technology

[0002] As a component of the car interior, the car seat directly affects the comfort of passengers and driving safety. Its structural design and manufacturing process have a significant impact on the overall quality of the vehicle. The strength of the car seat frame mainly relies on the support of various structural tubes, including the inner backrest support tube, backrest curved tube, headrest backrest curved tube, and backrest frame. These structural tubes need to be processed into specific bending shapes and dimensions using specialized steel pipe production equipment according to the design requirements of different car models to achieve compatibility with the overall seat structure and ensure the structural stability and reliability of the seat during long-term use.

[0003] Chinese Patent Publication No. CN116423214A discloses a steel pipe forming device with a correction and positioning function. The device includes a leveling mechanism, a pretreatment mechanism, a coiling mechanism, a high-frequency welding mechanism, a surface treatment mechanism, a cooling mechanism, a sizing mechanism, and a length-fixing mechanism. The working process of the device is as follows: the steel strip raw material passes through the leveling mechanism for flatness correction, the pretreatment mechanism for position correction and positioning, and the coiling mechanism for continuous coiling into a tubular billet. Then the billet enters the high-frequency welding mechanism to complete welding and forming. At this time, the surface of the welded steel pipe will carry weld beads. When the weld beads on the steel pipe pass through the surface treatment mechanism, the weld beads on the surface of the steel pipe are removed by the second cutter on the second cutter holder. Finally, the pipe is sent to the cooling mechanism, the sizing mechanism, and the length-fixing mechanism to obtain a steel pipe product that meets the specifications. In the actual production process of high-frequency welding of steel pipes, weld beads not only form on the outer surface of the pipe blank at the weld seam, but also on the inner surface due to the accumulation of molten metal at high welding temperature. The presence of internal weld beads reduces the effective cross-section inside the steel pipe, leading to stress concentration and affecting the load-bearing strength and assembly accuracy of the structural pipe. However, the existing steel pipe forming equipment can only remove weld beads on the outer surface of the steel pipe online, and cannot complete the cleaning of internal weld beads in the production process at the same time. It can only be further processed by using a special internal weld bead scraping device or manual grinding after the steel pipe is formed and removed from the production line. This prolongs the production cycle of the steel pipe, reduces the production efficiency of the steel pipe, and has obvious technical deficiencies. Summary of the Invention

[0004] To improve the production efficiency of steel pipes, this application provides a high-frequency welded pipe production equipment for automotive seat structural tubes and its usage method.

[0005] This application provides a high-frequency welded pipe production equipment for automotive seat structural tubes and its usage method, which adopts the following technical solution: A high-frequency welded pipe production equipment for automotive seat structural tubes and its usage method are disclosed. The equipment includes a frame, a leveling mechanism, a coiling mechanism, a high-frequency welding mechanism, an external removal mechanism, a cooling mechanism, and a cutting mechanism, all located on the side of the frame. An internal removal mechanism is also provided on the frame. The internal removal mechanism includes a fixed seat located at the starting position of the coiling mechanism near the leveling mechanism. A tool holder is detachably connected to the fixed seat via a clamping assembly. The tool holder is arranged parallel to the length of the frame and has a scraper at its end. When the tool holder is fixed to the fixed seat via the clamping assembly, the scraper extends to the welding head of the high-frequency welding mechanism near the external removal mechanism. The blade of the scraper abuts against the inner wall of the tube blank to remove the internal weld beads.

[0006] By adopting the above technical solution, before the steel strip is released, the tool holder is fixed on the fixed seat by the clamping assembly. At this time, the scraper extends to the back of the welding head of the high-frequency welding mechanism. Since the fixed seat is set at the starting position of the coiling mechanism, when the steel strip enters the starting position of the coiling mechanism after being straightened by the leveling mechanism, the tool holder passes through the opening of the steel strip just as it is unrolled and enters the interior of the steel strip. As the coiling mechanism gradually rolls the steel strip into an open tubular billet, the opening gap of the billet gradually approaches the scraper. After the billet is welded by the high-frequency welding mechanism, the internal weld bead generated on the inner surface of the billet will directly contact the scraper blade. With the continuous conveying of the steel strip, the scraper moves horizontally relative to the internal weld bead, thereby cutting the internal weld bead through the edge of the scraper blade and peeling it off from the inner wall of the billet. This achieves online real-time scraping of the internal weld bead, eliminating the need for additional cleaning processes after steel pipe production, shortening the steel pipe production cycle and reducing steel pipe production efficiency.

[0007] Optionally, the top wall of the fixed seat is provided with a sliding groove, and the clamping assembly includes a bidirectional lead screw rotatably connected in the sliding groove. Clamping rods are respectively threaded to the two ends of the bidirectional lead screw with opposite thread directions. The ends of the clamping rods are slidably connected in the sliding groove, and the outer surface of the tool holder seat is provided with clamping holes that are inserted and engaged with the clamping rods.

[0008] By adopting the above technical solution, when fixing the tool holder, the worker holds the tool holder so that the clamping hole and the clamping rod are aligned. Then, the double-acting screw is rotated. Under the guidance and limitation of the sliding groove, the double-acting screw drives the clamping rod to slide towards each other along the sliding groove until the clamping rod is inserted into the clamping hole of the tool holder. In this way, the tool holder and the fixed seat are fixed. And under the opposite movement of the two clamping rods, the scraper blade is aligned with the preset trajectory of the weld inner surface of the subsequent formed tube blank.

[0009] Optionally, a rotating disk is rotatably connected to one end of the tool holder near the high-frequency welding mechanism. The scraper is disposed on the rotating disk, and a drive shaft is coaxially fixedly connected to the rotating disk. The tool holder has a cavity along its length to accommodate the drive shaft. The drive shaft extends along the length of the tool holder to the side near the fixed base. A drive motor is disposed on the fixed base. Synchronous pulleys are coaxially disposed at the ends of the output shaft of the drive motor and the drive shaft. A synchronous belt is fitted on the outer surface of the two synchronous pulleys.

[0010] By adopting the above technical solution, during the production of steel strip, the drive motor starts and drives the drive shaft to rotate through the synchronous pulley and synchronous transmission, which in turn drives the rotating disk and scraper to rotate. When the inner weld bead comes into contact with the rotating scraper blade, the rotating scraper generates a radial shearing force on the inner weld bead, thereby cutting the inner weld bead into fine particles. This avoids large weld bead residues or blockage of the internal channels of the tube blank. At the same time, the granular weld bead is easily discharged from the tube blank, which is convenient for subsequent centralized collection and cleaning.

[0011] Optionally, the scraper can be detachably connected to the rotating disk by connecting screws.

[0012] By adopting the above technical solution, the scraper and the rotating disk can be separated by connecting screws during steel strip production, which facilitates quick replacement of the scraper according to the inner diameter of the tube blank or the wear of the tool.

[0013] Optionally, the cavity is provided with a first partition and a second partition. The first partition and the inner wall of the cavity enclose a chip-collecting cavity. Chip-collecting grooves communicating with the chip-collecting cavity are evenly distributed circumferentially on the side wall of the tool holder. Chip-collecting holes communicating with the outside are formed on the side wall of the chip-collecting grooves. The second partition and the inner wall of the cavity enclose a negative pressure cavity. A negative pressure assembly is provided inside the negative pressure cavity. Multiple connecting pipes are provided between the first partition and the second partition, and each connecting pipe connects to the negative pressure cavity and the... The chip suction chamber is equipped with a first one-way valve, which limits the flow direction from the chip suction chamber to the negative pressure chamber. A loading seat is provided on the frame, and a collection box is provided on the loading seat. The top wall of the collection box has an exhaust hole communicating with the atmosphere, and the bottom surface is provided with a chip discharge pipe. A flange connecting pipe communicating with the negative pressure chamber is provided on the outer surface of the tool holder seat. The flange connecting pipe and the chip discharge pipe are connected. A second one-way valve is provided on the chip discharge pipe, which limits the flow direction from the negative pressure chamber to the collection box.

[0014] By adopting the above technical solution, during steel strip production, the negative pressure component creates a negative pressure environment in the negative pressure chamber, and this negative pressure environment is transmitted to the inside of the chip suction chamber through the connecting pipe. This creates a continuous suction force at the opening of the chip suction groove. Weld beads cut by the rotating scraper are drawn into the chip suction groove through the chip suction holes under the suction of the negative pressure airflow. At the same time, the first one-way valve opens, and the chip-carrying airflow enters the inside of the negative pressure chamber along the connecting pipe. When a positive pressure environment is formed inside the negative pressure chamber, the first one-way valve closes and the second one-way valve opens. At this time, the chip-carrying airflow enters the collection box through the flange connecting pipe and the chip discharge pipe. This achieves centralized collection of internal weld beads, eliminating the need for workers to separately remove weld beads and impurities inside the steel pipe after production, thereby further improving the production efficiency of the steel pipe.

[0015] Optionally, the first check valve and the second check valve have the same structure, both including a mounting plate disposed on the inner side wall of the connecting pipe and the chip discharge pipe. The mounting plate has an opening, and a valve shaft is rotatably connected to the mounting plate. A valve plate is disposed on the outer surface of the valve shaft. Torsion springs are sleeved on opposite sides of the valve shaft. One end of the torsion spring is disposed on the outer surface of the valve shaft, and the other end is disposed on the surface of the valve plate. In the natural state, the valve plate blocks the opening.

[0016] By adopting the above technical solution, when a negative pressure environment is formed inside the negative pressure chamber, the air pressure on the valve plate of the first one-way valve near the chip suction chamber is greater than that on the other side. The gas pressure overcomes the elastic force of the torsion spring and pushes the valve plate to rotate toward the negative pressure chamber, thereby opening the opening. The chip-carrying airflow enters the negative pressure chamber through the connecting pipe. At this time, the valve plate of the second one-way valve is tightly pressed against the abutment plate under atmospheric pressure, and the chip discharge pipe is in a blocked state. When the air pressure inside the negative pressure chamber gradually increases, the air pressure on the valve plate of the first one-way valve near the negative pressure chamber is greater than that on the other side. Under the synergistic action of the torsion spring and the gas pressure, the connecting pipe is reset and blocked. The air pressure on the side of the valve plate of the second one-way valve near the negative pressure chamber is greater than that on the other side. The valve plate of the second one-way valve opens under the drive of the gas pressure difference, and the chip-carrying airflow in the negative pressure chamber enters the collection box through the flange connecting pipe and the chip discharge pipe.

[0017] Optionally, the negative pressure assembly includes a piston ring slidably sleeved on the outer surface of the drive shaft. The drive shaft surface is provided with a drive groove, which includes a left helical groove and a right helical groove connected end to end. The inner circumferential sidewall of the piston ring is provided with a ball slidably connected in the drive groove. A limit rod is provided in the negative pressure chamber along the length direction, and the piston ring slidably passes through the limit rod.

[0018] By adopting the above technical solution, during the process of the drive motor driving the transmission shaft to rotate, under the guidance and limitation of the limit rod, the drive groove on the surface of the transmission shaft drives the piston ring to reciprocate along the length of the negative pressure chamber through the ball bearings. When the transmission shaft moves away from the chip suction chamber, the gas volume in the negative pressure chamber increases to form a negative pressure. When the transmission shaft moves closer to the chip suction chamber, the gas volume in the negative pressure chamber decreases, and the gas pressure inside the negative pressure chamber gradually increases to form a positive pressure. In this way, gas driving force is provided for the directional flow of internal weld bead debris.

[0019] In summary, this application includes at least one of the following beneficial technical effects: This application utilizes an internal removal mechanism. The cutter holder is inserted into the steel strip from the opening where the coiling begins. As the coiling mechanism gradually rolls the steel strip into an open tubular blank, the opening of the blank gradually approaches the scraper. After the blank is welded by the high-frequency welding mechanism, the internal weld beads generated on the inner surface of the blank will directly contact the scraper's cutting edge. With the continuous conveying of the steel strip, the scraper moves horizontally relative to the internal weld beads, thereby cutting the internal weld beads through the edge of the scraper's cutting edge and peeling them off from the inner wall of the blank. This achieves online real-time removal of internal weld beads, eliminating the need for additional cleaning processes after steel pipe production, shortening the steel pipe production cycle, and reducing steel pipe production efficiency. This application sets up a rotating disk, a drive motor, and a transmission shaft. During the steel strip production process, the drive motor starts and drives the transmission shaft to rotate through the synchronous pulley and synchronous transmission action. This, in turn, drives the rotating disk and the scraper to rotate. When the inner weld bead comes into contact with the rotating scraper blade, the rotating scraper generates a radial shearing force on the inner weld bead, thereby cutting the inner weld bead into fine granular debris. This avoids large weld bead residues or blockage of the internal channels of the tube blank. At the same time, the granular weld bead is easily discharged from the tube blank, which is convenient for subsequent centralized collection and cleaning. This application, by setting up a negative pressure component, a first one-way valve, a second one-way valve, and a collection box, creates alternating negative and positive pressures inside the negative pressure chamber. When the negative pressure chamber is under negative pressure, the first one-way valve opens, and the negative pressure is transmitted to the chip suction chamber through the connecting pipe. The chip suction groove generates a continuous suction force at the chip suction hole, which gathers fine weld beads into the negative pressure chamber through the chip suction chamber and the connecting pipe. When the negative pressure chamber is under positive pressure, the second one-way valve opens, and the weld beads move to the collection box through the chip discharge pipe. This achieves online synchronous cleaning of weld beads and collection of debris, eliminating the need for workers to separately remove weld beads and impurities inside the steel pipe after production, thereby further improving the production efficiency of steel pipes. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this application.

[0021] Figure 2This is a schematic diagram of the internal removal mechanism in Embodiment 1 of this application.

[0022] Figure 3 This is a cross-sectional view of the fixing seat in Embodiment 1 of this application.

[0023] Figure 4 This is a schematic diagram of the tool holder in Embodiment 1 of this application.

[0024] Figure 5 This is a cross-sectional view of the tool holder in Embodiment 1 of this application.

[0025] Figure 6 yes Figure 5 Enlarged view of point A in the middle.

[0026] Figure 7 This is a schematic diagram of the structure of the first check valve and the second check valve when they are open in the embodiments of this application.

[0027] Explanation of reference numerals in the attached drawings: 01. Frame; 02. Unwinding mechanism; 03. Leveling mechanism; 04. Coiling mechanism; 05. High-frequency welding mechanism; 06. External removal mechanism; 07. Cooling mechanism; 08. Shaping mechanism; 09. Cutting mechanism; 1. Internal removal mechanism; 2. Fixed base; 21. Sliding groove; 22. Drive motor; 23. Synchronous pulley; 24. Synchronous belt; 3. Clamping assembly; 31. Bidirectional lead screw; 32. Clamping rod; 4. Tool holder; 41. Clamping hole; 42. Scraper; 43. Hard rubber tube; 44. Rotating disk; 45. Connecting screw; 46. ​​Chip suction groove; 47. Chip suction hole; 48. Flange connecting pipe; 5. Cavity; 51. First partition; 52. Second partition; 53. Chip suction chamber; 54. Negative pressure chamber; 55. Connecting pipe; 551. First one-way valve; 6. Drive shaft; 61. Drive groove; 7. Negative pressure assembly; 71. Piston ring; 72. Limiting rod; 73. Sealing ring; 8. Loading seat; 9. Collection box; 91. Chip discharge pipe; 911. Second one-way valve; 92. Vent hole; 10. Mounting plate; 101. Opening; 102. Valve shaft; 103. Valve plate; 104. Torsion spring. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0029] This application discloses a high-frequency welded pipe production equipment for automotive seat structural tubes and its usage method. Example

[0030] Reference Figure 1 and Figure 2A high-frequency welded pipe production equipment for automotive seat structural tubes includes a frame 01. The side end of the frame 01 is provided with an unwinding mechanism 02 for releasing steel strip. The frame 01 is sequentially equipped with a leveling mechanism 03, a coiling mechanism 04, an inner removal mechanism 1, a high-frequency welding mechanism 05, an outer removal mechanism 06, a cooling mechanism 07, a shaping mechanism 08, and a cutting mechanism 09 along the steel strip conveying direction.

[0031] Reference Figure 1 and Figure 2 In this embodiment, the leveling mechanism 03 consists of multiple sets of leveling rollers arranged vertically and vertically to correct the flatness of the uncoiled steel strip and eliminate internal stress and warping deformation generated during the rolling and storage of the steel strip; the coiling mechanism 04 uses multiple sets of gradient pressure roller assemblies to continuously coil the steel strip, and through the gradient design of the pressure roller profile, the steel strip is gradually formed into an open 101 tubular blank; the high-frequency welding mechanism 05 uses high-frequency induced current to act on the edge of the tube blank opening 101, so that the steel strip joint is rapidly heated to a molten state, and the metallurgical bonding of the weld is achieved by means of the tube blank forming tension, thus completing the welding and forming of the steel pipe; the external scraping mechanism 06 adopts the external scraper 42 assembly in the prior art, and the scraper is used to scrape the outer surface of the steel pipe. The bonding and scraping process removes the weld beads generated after welding, ensuring the smoothness of the outer surface of the steel pipe. The cooling mechanism 07 uses a spray cooling method to rapidly cool the high-temperature welded steel pipe through circulating cooling water. The shaping mechanism 08 consists of multiple sets of circumferentially evenly distributed sizing rollers. By pressing the roller surface against the outer surface of the steel pipe, the outer diameter of the cooled steel pipe is shaped to obtain automotive structural tubes with different cross-sectional shapes. The cutting mechanism 09 consists of a length detection module and a hydraulic cutting tool. It is used to cut the shaped steel pipe to length according to the preset size of the automotive seat structural tube. All of the above mechanisms are existing technologies in steel pipe production equipment, and their specific composition and operating principle will not be further described in this embodiment.

[0032] Reference Figure 2 and Figure 3 The internal removal mechanism 1 includes a fixed seat 2 fixedly mounted on the frame 01. The fixed seat 2 is located on the side of the starting position of the coiling mechanism 04 near the leveling mechanism 03. A tool holder 4 is installed on the fixed seat 2 through a clamping assembly 3. Specifically, a sliding groove 21 is provided on the inner top wall of the fixed seat 2. The sliding groove 21 is perpendicular to the steel strip conveying direction. The clamping assembly 3 includes a bidirectional lead screw 31 rotatably connected in the sliding groove 21. Clamping rods 32 are threadedly connected to the two ends of the bidirectional lead screw 31 with opposite thread directions. The clamping rods 32 are L-shaped and slidably connected inside the sliding groove 21. A clamping hole 41 is provided on the side of the tool holder 4 near the clamping seat to engage with the clamping rods 32.

[0033] Reference Figure 2 and Figure 3The axis of the tool holder 4 is parallel to the direction of the steel belt conveyor. A scraper 42 for removing internal weld beads is installed at the end of the tool holder 4. A hard rubber tube 43 is installed on the outer surface of the tool holder 4 away from the scraper 42. It has good rigidity and wear resistance. The axial position of the tool holder 4 can be manually adjusted by pulling the hard rubber tube 43, which facilitates equipment debugging and scraper 42 maintenance.

[0034] Before the steel strip is released, the tool holder 4 is pulled by the rigid rubber tube 43 to move the tool holder 4 to the bottom of the fixed seat 2, and the clamping hole 41 of the tool holder 4 is aligned with the clamping rod 32. Then, the double-acting screw 31 is rotated. Under the guidance and limit of the sliding groove 21, the double-acting screw 31 drives the clamping rod 32 to slide towards each other along the sliding groove 21 until the clamping rod 32 is inserted into the clamping hole 41 of the tool holder 4. In this way, the tool holder 4 is fixed to the fixed seat 2. At this time, the scraper 42 extends to the rear of the welding head of the high-frequency welding mechanism 05. Under the opposite movement of the two clamping rods 32, the cutting edge of the scraper 42 is aligned with the preset trajectory of the inner surface of the weld of the subsequent formed tube blank.

[0035] Since the fixed seat 2 is set at the starting position of the coiling mechanism 04, when the steel strip enters the starting position of the coiling mechanism 04 after being straightened by the leveling mechanism 03, the knife holder 4 passes through the opening 101 of the steel strip just as it is being rolled and enters the interior of the steel strip. As the coiling mechanism 04 gradually rolls the steel strip into a tubular blank with the opening 101, the gap of the opening 101 of the tube blank gradually approaches the scraper 42. After the tube blank is welded by the high-frequency welding mechanism 05, the internal weld bead generated on the inner surface of the tube blank will directly contact the cutting edge of the scraper 42. As the steel strip is continuously conveyed, the scraper 42 moves horizontally relative to the internal weld bead, thereby cutting the internal weld bead through the edge of the cutting edge of the scraper 42 and peeling the internal weld bead off the inner wall of the tube blank. This achieves online real-time scraping of the internal weld bead, eliminating the need for additional cleaning processes after steel pipe production, shortening the steel pipe production cycle and reducing the steel pipe production efficiency.

[0036] Reference Figure 3 and Figure 4 To improve the cleaning effect of internal weld beads, a rotating disk 44 is rotatably connected to the end of the tool holder 4 near the high-frequency welding mechanism. The scraper 42 is detachably mounted on the rotating disk 44 by connecting screws 45, which facilitates quick replacement of the scraper 42 according to the inner diameter of the tube blank or the wear of the tool. A cavity 5 is opened along the length direction of the tool holder 4. A drive shaft 6 is coaxially fixedly connected to the rotating disk 44 and rotatably set in the mounting cavity. The drive shaft 6 extends along the length direction of the tool holder 4 to the end near the coiling mechanism 04. A drive motor 22 is fixedly mounted on the outer surface of the fixed base 2. The output shaft of the drive motor 22 and the end of the drive shaft 6 near the coiling mechanism 04 are both fixedly connected to synchronous pulleys 23. A synchronous belt 24 is sleeved on the outer surface of the two pulleys.

[0037] During the production of steel strip, the drive motor 22 starts and drives the drive shaft 6 to rotate through the synchronous pulley 23 and synchronous transmission. This drives the rotating disk 44 and the scraper 42 to rotate. When the inner weld bead comes into contact with the cutting edge of the rotating scraper 42, the rotating scraper 42 generates a radial shearing force on the inner weld bead, thereby cutting the inner weld bead into fine particles. This avoids large weld bead residues or blockage of the internal channels of the tube blank. At the same time, the granular weld bead is easily discharged from the tube blank, which is convenient for subsequent centralized collection and cleaning.

[0038] Reference Figure 3 and Figure 5 Inside the cavity 5, a first partition 51 and a second partition 52 are fixedly connected in sequence along the conveying direction of the steel belt. The first partition 51 and the inner side wall of the mounting cavity near the rotating disk 44 form a chip suction cavity 53. The inner side wall of the tool holder 4 near the rotating disk 44 is evenly provided with multiple chip suction grooves 46 that communicate with the chip suction cavity 53. The outer surface of the tool holder 4 is provided with chip suction holes 47 that communicate with the multiple chip suction grooves 46. The second partition 52 and the inner side wall of the mounting cavity near the coiling mechanism form a negative pressure cavity 54. A negative pressure component 7 is provided inside the negative pressure cavity 54. Multiple connecting pipes 55 are fixedly connected between the first partition 51 and the second partition 52. Each connecting pipe connects the negative pressure cavity 54 and the chip suction cavity 53.

[0039] During steel strip production, the negative pressure component 7 creates a negative pressure environment in the negative pressure chamber 54, and transmits this negative pressure environment to the inside of the chip suction chamber 53 through the connecting pipe 55. This causes a continuous suction force to be generated at the opening of the chip suction groove 46. Weld beads cut off by the rotating scraper 42 are drawn into the inside of the chip suction groove 46 through the chip suction hole 47 under the suction of the negative pressure airflow, and finally flow into the chip suction chamber 53. This achieves centralized collection of internal weld beads, eliminating the need for workers to separately remove weld beads and impurities inside the steel pipe after production, thereby further improving the production efficiency of the steel pipe.

[0040] Reference Figure 5 and Figure 6Each connecting pipe 55 is equipped with a first one-way valve 551. The first one-way valve 551 restricts the airflow carrying weld spatter to flow only through the chip suction chamber 53 to the negative pressure chamber 54. When the negative pressure chamber 54 is in a negative pressure environment, the first one-way valve 551 opens. A loading seat 8 is fixedly mounted on the frame 01. The loading seat 8 is located in the middle section of the coiling mechanism 04. A collection box 9 is fixedly mounted on the loading seat 8. A chip discharge pipe 91 is installed on the outer surface of the collection box 9. A flange connecting pipe 48 for quick docking with the chip discharge pipe 91 is installed on the surface of the tool holder 4. The flange connecting pipe 48 is connected to the negative pressure chamber 54. The connection port of cavity 54 is located on the side close to the chip suction cavity 53, ensuring that the airflow inside the negative pressure cavity 54 can be directly guided to the chip discharge pipe 91. A second one-way valve 911 is installed on the chip discharge pipe 91. The second one-way valve 911 restricts the airflow carrying weld bead debris to flow only through the negative pressure cavity 54 toward the collection box 9. When the negative pressure cavity 54 is in a positive pressure environment, the second one-way valve 911 is opened. The collection box 9 is provided with a vent hole 92 communicating with the atmosphere. Each vent hole 92 is equipped with a filter screen (not shown in the figure) for intercepting weld bead debris, preventing debris from being discharged into the external environment with the airflow.

[0041] Reference Figure 6 and Figure 7 It should be noted that the first one-way valve 551 and the second one-way valve 911 have the same structure in this embodiment. Both include a mounting plate 10 fixedly connected to the inner wall of the connecting pipe 55 and the chip discharge pipe 91. The mounting plate 10 has an opening 101 for the airflow carrying particles to pass through. A valve shaft 102 is rotatably connected to the mounting plate 10. A valve plate 103 for sealing the opening 101 is fixedly connected to the outer surface of the valve shaft 102. It should be noted that the axis of the valve shaft 102 is coaxial with the diameter of the connecting pipe 55 or the chip discharge pipe 91. The valve plate 103 is positioned so that it can rotate smoothly inside the pipeline. The valve plate 103 of the first one-way valve 551 is located on the side near the negative pressure chamber 54, and the valve plate 103 of the second one-way valve 911 is located on the side near the collection box 9. Torsion springs 104 are sleeved on both opposite sides of the valve shaft 102. One end of the torsion spring 104 is fixedly connected to the outer surface of the valve shaft 102, and the other end is fixedly connected to the surface of the valve plate 103. In its natural state, the valve plate 103 abuts against the surface of the mounting plate 10, thereby blocking the opening 101.

[0042] Reference Figure 5 and Figure 6The negative pressure assembly 7 includes a piston ring 71 that is slidably sleeved on the outer surface of the drive shaft 6. The outer surface of the piston ring 71 is tightly fitted to the inner wall of the negative pressure chamber 54. The portion of the drive shaft 6 located in the negative pressure chamber 54 has a drive groove 61. The drive groove 61 includes a left helical groove and a right helical groove connected end to end. A ball (not shown in the figure) is fixedly connected to the inner circumferential surface of the piston ring 71 and slidably connected in the drive groove 61. The ball is tightly fitted to the groove wall of the drive groove 61. A limit rod 72 is fixedly connected along the length direction inside the negative pressure chamber 54. The piston ring 71 is slidably sleeved on the outside of the limit rod 72.

[0043] Reference Figure 5 and Figure 6 The piston ring 71 has a sealing ring 73 fixedly connected to the opposite surface of the transmission shaft 6 and the limiting rod 72. The sealing ring 73 is slidably sleeved on the outer surface of the transmission shaft 6 and the limiting rod 72 to achieve dynamic sealing between the negative pressure chamber 54 and the transmission shaft 6 and prevent airflow from leaking from the gap.

[0044] During the process of the drive motor 22 driving the transmission shaft 6 to rotate, under the guidance and limitation of the limit rod 72, the drive groove 61 on the surface of the transmission shaft 6 drives the piston ring 71 to reciprocate along the length direction of the negative pressure chamber 54 through the ball. When the transmission shaft 6 moves away from the chip suction chamber 53, the gas volume in the negative pressure chamber 54 increases to form a negative pressure. At this time, the gas pressure on the valve plate 103 of the first one-way valve 551 near the chip suction chamber 53 is greater than that on the other side. The gas pressure overcomes the elastic force of the torsion spring 104 and pushes the valve plate 103 to rotate towards the negative pressure chamber 54, thereby opening the opening 101 in the connecting pipe 55. The chip-carrying airflow enters the interior of the negative pressure chamber 54 through the connecting pipe. At this time, the valve plate 103 of the second one-way valve 911 is tightly pressed against the abutment plate under atmospheric pressure, and the chip discharge pipe 91 is in a blocked state. When the drive shaft 6 moves toward the direction close to the chip suction chamber 53, the gas volume in the negative pressure chamber 54 decreases, and the gas pressure inside the negative pressure chamber 54 gradually increases. At this time, the gas pressure on the valve plate 103 of the first one-way valve 551 near the negative pressure chamber 54 is greater than that on the other side. Under the combined action of the torsion spring 104 and the gas pressure, the connecting pipe is reset and blocked. The gas pressure on the side of the valve plate 103 of the second one-way valve 911 near the negative pressure chamber 54 is greater than that on the other side. The valve plate 103 of the second one-way valve 911 opens under the action of gas pressure. The chip-carrying airflow in the negative pressure chamber 54 enters the collection box 9 through the flange connecting pipe 48 and the chip discharge pipe 91. The airflow entering the collection box 9 passes through the filter screen at the vent 92 and is discharged to the atmosphere. In this way, the gas is circulated, and the welding debris is intercepted by the filter screen and stored in the collection box 9, thus realizing the collection of debris.

[0045] The implementation principle of a high-frequency welded pipe production equipment for automotive seat structure tubes in this application embodiment is as follows: Before the steel strip is released, the tool holder 4 is pulled by the connecting pipe 55 to move the tool holder 4 to the bottom of the fixed seat 2, and the clamping hole 41 of the tool holder 4 is aligned with the clamping rod 32. Then, the tool holder 4 and the fixed seat 2 are fixed by the clamping assembly 3. At this time, the scraper 42 extends to the rear of the welding head of the high-frequency welding mechanism 05, and under the opposite movement of the two clamping rods 32, the cutting edge of the scraper 42 is aligned with the preset trajectory of the weld inner surface of the subsequent formed tube blank. Since the fixed seat 2 is set at the starting position of the coiling mechanism 04, when the steel strip enters the starting position of the coiling mechanism 04 after being straightened by the leveling mechanism 03, the knife holder 4 passes through the opening 101 of the steel strip just as it is being rolled and enters the interior of the steel strip. As the coiling mechanism 04 gradually rolls the steel strip into a tubular blank with the opening 101, the gap of the opening 101 of the tube blank gradually approaches the scraper 42. After the tube blank is welded by the high-frequency welding mechanism 05, the internal weld bead generated on the inner surface of the tube blank will directly contact the cutting edge of the scraper 42. As the steel strip is continuously conveyed, the scraper 42 moves horizontally relative to the internal weld bead, thereby cutting the internal weld bead through the edge of the cutting edge of the scraper 42 and peeling the internal weld bead off the inner wall of the tube blank. This achieves online real-time scraping of the internal weld bead, eliminating the need for additional cleaning processes after steel pipe production, shortening the steel pipe production cycle and reducing the steel pipe production efficiency. Example

[0046] A method of using a high-frequency welded pipe production equipment for automotive seat structural tubes, comprising the high-frequency welded pipe production equipment for automotive seat structural tubes as described in Example 1, and further comprising the following steps: S1, Equipment debugging: Install the steel strip to be processed onto the unwinding mechanism 02, rotate the double-acting screw 31 on the fixed seat 2, the double-acting screw 31 drives the two clamping rods 32 to slide towards each other until they are inserted into the clamping hole 41, thereby fixing the fixed seat 2 and the tool holder seat 4, and connecting the flange connecting pipe 48 to the chip removal pipe 91. S2, Leveling: Start the unwinding mechanism 02 to release the steel belt, and the steel belt enters the leveling mechanism 03 along the conveying direction for flatness correction; S3, Coiling into a blank: The leveled steel strip enters the coiling mechanism 04 and is continuously rolled by multiple sets of gradient pressure roller assemblies. With the help of the gradient design of the pressure roller profile, the steel strip is gradually formed into an open 101 tubular blank. During this process, the cutter holder 4 is simultaneously inserted into the blank from the opening 101 where the steel strip just begins to be rolled. S4, Welding: The tubular billet with opening 101 enters the high-frequency welding mechanism 05. The high-frequency induced current acts on the edge of the billet opening 101, causing the steel strip joint to heat up rapidly to a molten state and complete the steel pipe welding. S5, Internal weld bead treatment: The drive motor 22 drives the transmission shaft 6 to rotate, and the transmission shaft 6 drives the rotating disk 44 and scraper 42 to rotate, cutting the internal weld bead generated on the inner surface of the tube blank after welding into fine particles. The drive motor 22 synchronously drives the negative pressure component 7 to run. The negative pressure component 7 forms alternating negative and positive pressure inside the negative pressure chamber 54. When the negative pressure chamber 54 is under negative pressure, the negative pressure is transmitted to the chip suction chamber 53 through the connecting pipe. The chip suction groove 46 generates a continuous suction force at the chip suction hole 47, which gathers the fine weld bead particles into the negative pressure chamber 54 through the chip suction chamber 53 and the connecting pipe. When the negative pressure chamber 54 is under positive pressure, the second one-way valve 911 opens, and the weld bead particles move to the inside of the collection box 9 through the chip discharge pipe 91, realizing online synchronous cleaning of internal weld bead and chip collection. S6, External weld bead treatment: After welding, the steel pipe enters the external removal mechanism 06, and the external scraper 42 is attached to the outer surface of the steel pipe to remove the external weld bead generated during the welding process. S7, Cooling: The steel pipe after the external weld bead treatment enters the cooling mechanism 07, where the steel pipe is rapidly cooled by cooling water spray. S8, Shaping: After cooling, the steel pipe enters the shaping mechanism 08, where multiple sets of sizing rollers press against the outer surface of the steel pipe to calibrate and shape the outer diameter of the steel pipe, resulting in a structural pipe with the required cross-sectional shape. S9, Cutting: The shaped steel pipe enters the cutting mechanism 09 for cutting. When the preset size of the automotive seat structure tube is reached, the hydraulic cutting tool is activated to cut the steel pipe to the specified length, and the finished automotive seat structure tube that meets the specifications is obtained.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-frequency welded pipe production equipment for automotive seat structural tubes, comprising a frame (01), wherein the side end of the frame (01) is provided with a leveling mechanism (03), a coiling mechanism (04), a high-frequency welding mechanism (05), an external removal mechanism (06), a cooling mechanism (07), and a cutting mechanism (09), characterized in that, The frame (01) is provided with an internal removal mechanism (1). The internal removal mechanism (1) includes a fixed seat (2). The fixed seat (2) is located on the side of the starting position of the coiling mechanism (04) near the leveling mechanism (03). A tool holder (4) is detachably connected to the fixed seat (2) through a clamping assembly (3). The tool holder (4) is arranged parallel to the length direction of the frame (01) and has a scraper (42) at its end. When the tool holder (4) is fixed to the fixed seat (2) through the clamping assembly (3), the scraper (42) extends to the side of the welding head of the high-frequency welding mechanism (05) near the external removal mechanism (06). The blade of the scraper (42) abuts against the inner wall of the tube blank to remove the internal weld beads.

2. The high-frequency welded pipe production equipment for automotive seat structural tubes according to claim 1, characterized in that, The top wall of the fixed base (2) is provided with a sliding groove (21). The clamping assembly (3) includes a bidirectional lead screw (31) rotatably connected in the sliding groove (21). The two ends of the bidirectional lead screw (31) with opposite thread directions are respectively threaded with clamping rods (32). The ends of the clamping rods (32) are slidably connected in the sliding groove (21). The outer surface of the tool holder (4) is provided with a clamping hole (41) that is inserted and engaged with the clamping rods (32).

3. The high-frequency welded pipe production equipment for automotive seat structural tubes according to claim 1, characterized in that, The tool holder (4) is rotatably connected to a rotating disk (44) near the end of the high-frequency welding mechanism. The scraper (42) is mounted on the rotating disk (44). A drive shaft (6) is coaxially fixedly connected to the rotating disk (44). The tool holder (4) has a cavity (5) along its length to accommodate the drive shaft (6). The drive shaft (6) extends along the length of the tool holder (4) to the side near the fixed seat (2). A drive motor (22) is mounted on the fixed seat (2). The output shaft of the drive motor (22) and the end of the drive shaft (6) are both coaxially mounted with synchronous pulleys (23). The outer surfaces of the two synchronous pulleys (23) are fitted with a synchronous belt (24).

4. The high-frequency welded pipe production equipment for automotive seat structural tubes according to claim 3, characterized in that, The scraper (42) is detachably connected to the rotating disk (44) by connecting screws (45).

5. The high-frequency welded pipe production equipment for automotive seat structural tubes according to claim 3, characterized in that, The cavity (5) is provided with a first partition (51) and a second partition (52). The first partition (51) and the inner wall of the cavity (5) enclose a chip suction cavity (53). The side wall of the tool holder is provided with chip suction grooves (46) that communicate with the chip suction cavity (53) evenly in the circumferential direction. The side wall of the chip suction groove (46) is provided with chip suction holes (47) that communicate with the outside. The second partition (52) and the inner wall of the cavity (5) enclose a negative pressure cavity (54). The negative pressure cavity (54) is provided with a negative pressure component (7). A plurality of connecting pipes (55) are provided between the first partition (51) and the second partition (52). Each connecting pipe (55) connects the negative pressure cavity (54) and the chip suction cavity (53). 3) A first one-way valve (551) is provided, which limits the flow direction from the chip suction chamber (53) to the negative pressure chamber (54). A loading seat (8) is provided on the frame (01), and a collection box (9) is provided on the loading seat (8). The top wall of the collection box (9) is provided with an exhaust hole communicating with the atmosphere, and a chip discharge pipe (91) is provided on the bottom surface. A flange connecting pipe (48) communicating with the negative pressure chamber (54) is provided on the outer surface of the tool holder seat (4). The flange connecting pipe (48) is used to communicate with the chip discharge pipe (91). A second one-way valve (911) is provided on the chip discharge pipe (91), which limits the flow direction from the negative pressure chamber (54) to the collection box (9).

6. The high-frequency welded pipe production equipment for automotive seat structural tubes according to claim 5, characterized in that, The first check valve (551) and the second check valve (911) have the same structure, both including a mounting plate (10) disposed on the inner side wall of the connecting pipe (55) and the chip discharge pipe (91). An opening (101) is provided on the mounting plate (10). A valve shaft (102) is rotatably connected to the mounting plate (10). A valve plate (103) is provided on the outer surface of the valve shaft (102). Torsion springs (104) are sleeved on both opposite sides of the valve shaft (102). One end of the torsion spring (104) is disposed on the outer surface of the valve shaft (102), and the other end is disposed on the surface of the valve plate (103). In the natural state of the torsion spring (104), the valve plate (103) blocks the opening (101).

7. The high-frequency welded pipe production equipment for automotive seat structural tubes according to claim 5, characterized in that, The negative pressure assembly (7) includes a piston ring (71) slidably sleeved on the outer surface of the transmission shaft (6). The transmission shaft (6) has a drive groove (61) on its surface. The drive groove (61) includes a left helical groove and a right helical groove connected end to end. The inner circumferential sidewall of the piston ring (71) is provided with a ball that is slidably connected in the drive groove (61). A limit rod (72) is provided in the negative pressure cavity (54) along the length direction. The piston ring (71) slides through the limit rod (72).

8. A method of using a high-frequency welded pipe production equipment for automotive seat structural tubes, characterized in that, The high-frequency welded pipe production equipment for automotive seat structural tubes according to any one of claims 1 to 7 includes the following steps: S1, Equipment debugging: Install the steel strip to be processed onto the unwinding mechanism (02), connect the tool holder (4) and the fixed seat (2) using the clamping assembly (3), and then connect the flange connecting pipe (48) to the chip discharge pipe (91); S2, Leveling: Start the unwinding mechanism (02) to release the steel belt, and the steel belt enters the leveling mechanism (03) along the conveying direction for flatness correction; S3, Pressing and rolling into a blank: The leveled steel strip enters the pressing and rolling mechanism (04) to gradually form the steel strip into an open (101) tubular blank. During this process, the cutter holder (4) is simultaneously inserted into the blank from the opening (101) where the steel strip just begins to be rolled. S4, Welding: The tubular blank with opening (101) enters the high-frequency welding mechanism (05). The high-frequency induced current acts on the edge of the blank opening (101), causing the steel strip joint to heat up rapidly to the melting state and complete the steel pipe welding. S5, Internal weld bead treatment: The drive motor (22) drives the transmission shaft (6) to rotate, and the transmission shaft (6) drives the rotating disk (44) and scraper (42) to rotate, cutting the internal weld bead generated on the inner surface of the tube blank after welding into fine particles; The drive motor (22) synchronously drives the negative pressure component (7) to run, and the negative pressure component (7) forms alternating negative pressure and positive pressure inside the negative pressure chamber (54). When the negative pressure chamber (54) is under negative pressure, the first one-way valve (551) opens, and the negative pressure is transmitted to the chip suction chamber (53) through the connecting pipe. Through the chip suction groove (46), a continuous suction force is generated at the chip suction hole (47), and the fine weld bead particles are gathered into the negative pressure chamber (54) through the chip suction chamber (53) and the connecting pipe. When the negative pressure chamber (54) is under positive pressure, the second one-way valve (911) opens, and the weld bead particles move to the collection box (9) through the chip discharge pipe (91), realizing online synchronous cleaning of internal weld bead and chip collection; S6, External weld bead treatment: After welding, the steel pipe enters the external removal mechanism (06), and the external scraper (42) is attached to the outer surface of the steel pipe to remove the external weld bead generated during the welding process; S7, Cooling: The steel pipe after the external weld bead treatment enters the cooling mechanism (07), and the steel pipe is rapidly cooled by the spray of cooling water; S8, Shaping: The cooled steel pipe enters the shaping mechanism (08), and is pressed against the outer surface of the steel pipe by multiple sets of sizing rollers to calibrate and shape the outer diameter of the steel pipe, so as to obtain the structural pipe with the required cross-sectional shape. S9, Cutting: The shaped steel pipe enters the cutting mechanism (09) for cutting. When the preset size of the car seat structure tube is reached, the hydraulic cutting tool is started to cut the steel pipe to a fixed length and obtain the finished car seat structure tube that meets the specifications.

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