Automatic polishing production line for chair frame welding oxide layer

Abstract

The invention discloses an automatic polishing production line for a welding oxide layer of a chair frame. The workpiece comprises a back frame pipe and a foot pipe, the foot pipe comprises a first V-shaped avoiding part and a second V-shaped avoiding part which are symmetrically arranged, and the foot pipe is embedded and welded between the first V-shaped avoiding part and the second V-shaped avoiding part to form a welding part; the conveying system is installed on the machine base, the conveying system comprises a feeding conveying mechanism, an automatic feeding mechanism and a discharging conveying mechanism, the conveying system is used for conveying workpieces, and the automatic feeding mechanism comprises an ascending workshop section, a translation workshop section and a descending workshop section; and the grinding system is installed on the machine base, the grinding system comprises a first grinding mechanism comprising a first front face grinding assembly and a first back face grinding assembly, the second grinding mechanism comprises an upper surface grinding assembly, a side face grinding assembly and a lower surface grinding assembly, and the third grinding mechanism comprises a second back face grinding assembly and a second front face grinding assembly. The production efficiency can be improved, the labor intensity is reduced and the environmental pollution is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of furniture manufacturing equipment, and particularly relates to an automatic grinding production line for the oxide layer of chair frame welding. Background Art

[0002] In the metal furniture manufacturing industry, as one of the key components, the chair frame usually needs to go through a welding process to combine multiple steel pipes into the final structure. However, during the welding process, an oxide layer, namely the so-called "black skin", will inevitably be generated at the welding part. This oxide layer not only affects the appearance quality of the product, but may also have an adverse impact on subsequent surface treatment processes, such as spraying coatings. Therefore, it must be removed before spraying.

[0003] Traditional methods for removing black skin mainly rely on chemical pickling processes, such as treating with a phosphorus-free sulfuric acid solution. Although this method can effectively remove black skin to a certain extent, a large amount of wastewater and harmful gases will be generated during the chemical pickling process. If directly discharged without proper treatment, it will cause serious pollution to the surrounding environment. Long-term use of the pickling process will also increase the enterprise's sewage treatment cost, further squeezing the profit margin.

[0004] For chair legs with irregular shapes (special-shaped parts), existing grinding equipment often fails to meet the requirements of efficient and high-quality grinding. Traditional grinding tools or semi-automatic grinding equipment are usually designed to process relatively regular geometric shapes. When facing workpieces with complex contours, either the ideal grinding effect cannot be achieved, or the operation is extremely inconvenient, resulting in low production efficiency. At the same time, although manual grinding can flexibly handle workpieces of various shapes, there are problems such as high labor intensity, low work efficiency, and unstable grinding quality. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides an automatic grinding production line for the oxide layer of chair frame welding, which can improve production efficiency, reduce labor intensity, and reduce environmental pollution.

[0006] An automatic grinding production line for the oxide layer of chair frame welding according to an embodiment of the first aspect of the present invention includes: A machine base; A workpiece, including a backrest pipe and a leg pipe. The leg pipe includes a symmetrically arranged first V-shaped avoidance part and a second V-shaped avoidance part. The leg pipe is fitted and welded between the first V-shaped avoidance part and the second V-shaped avoidance part to form a welding part; A conveying system, installed on the machine base. The conveying system includes a feeding conveying mechanism, an automatic feeding mechanism, and a discharging conveying mechanism. The conveying system is used to convey the workpiece. The automatic feeding mechanism includes a rising section, a translation section, and a descending section; A grinding system is installed on the machine base. The grinding system includes a first grinding mechanism, a second grinding mechanism, and a third grinding mechanism. The first grinding mechanism is arranged corresponding to the rising section. The first grinding mechanism includes a first front grinding assembly and a first back grinding assembly. The second grinding mechanism is arranged corresponding to the translation section. The second grinding mechanism includes an upper surface grinding assembly, a side surface grinding assembly, and a lower surface grinding assembly. The third grinding mechanism is arranged corresponding to the descending section. The third grinding mechanism includes a second back grinding assembly and a second front grinding assembly.

[0007] An automatic grinding production line for the oxide layer of chair frame welding according to an embodiment of the present invention has at least the following beneficial effects: Through the combination of an integrated conveying system and a multi-stage grinding system, the whole process of automatic operation from workpiece feeding, automatic positioning, precise grinding to finished product discharging is realized. Compared with the traditional manual grinding method or semi-automatic equipment, the production efficiency and production capacity are greatly improved. The production line is designed with a first grinding mechanism, a second grinding mechanism, and a third grinding mechanism specifically for the welding part of the chair legs. Each grinding mechanism is further divided into grinding assemblies for the front, back, upper surface, side surface, and lower surface, which can comprehensively cover all areas of the special-shaped workpiece that need to be processed, ensuring the consistency and high efficiency of the grinding quality; The mechanical grinding method is used to remove the black skin at the welding part, effectively avoiding the pollution to the environment caused by the waste water and harmful gases generated during the pickling process, meeting the requirements of modern green manufacturing; Through the automatic grinding of the system, not only can the black skin generated by welding be effectively removed, but also the smoothness and flatness of the surface of the welding part can be improved, facilitating the adhesion of subsequent coatings.

[0008] According to some embodiments of the present invention, the first front grinding assembly is arranged on the radial outer side of the rising section, and the first back grinding assembly is arranged on the radial inner side of the rising section. The first front grinding assembly and the second back grinding assembly perform cooperative grinding operations corresponding to the front and back of the welding part respectively. By grinding the welding part from the front and back respectively, it can ensure that all oxide layers are removed and the surface of the welding part is more uniform and smooth. Such a design helps to improve the appearance quality and service performance of the final product, meeting the high-standard requirements of furniture manufacturing.

[0009] According to some embodiments of the present invention, the upper surface grinding assembly and the lower surface grinding assembly are respectively arranged on the upper and lower sides of the translation section in the height direction, and are used for synchronously grinding the upper surface and the lower surface of the welded part. The side surface grinding assembly is arranged on the radial outer side of the translation section, and is used for laterally grinding the area of the backrest pipe close to the welded part. Integrating multiple grinding functions into one section simplifies the operation process and equipment structure, reduces the number of transfers of workpieces between different processes, reduces the complexity and error rate in the production process, saves space at the same time, and is beneficial to reducing the plant layout cost.

[0010] According to some embodiments of the present invention, the second back surface grinding assembly is arranged on the radial outer side of the descending section, and the second front surface grinding assembly is arranged on the radial inner side of the descending section to perform secondary grinding on the back surface and the front surface of the welded part. The side surface grinding assembly is located on the radial outer side of the translation section and is specifically used for laterally grinding the area of the backrest pipe close to the welded part. Such a layout can not only process areas that are difficult to reach by the front and back surface grinding assemblies, but also further optimize the appearance quality around the welded part to ensure overall consistency.

[0011] According to some embodiments of the present invention, the grinding system is further provided with a compensation assembly, and the first grinding mechanism, the second grinding mechanism and the third grinding mechanism are all installed on the machine base through the compensation assembly. The grinding system can quickly adapt to the requirements of different types and sizes of workpieces without large-scale adjustment of the equipment, improving the versatility and flexibility of the production line, and enabling the enterprise to respond more quickly to changes in market demand.

[0012] According to some embodiments of the present invention, the compensation assembly includes a hinge assembly and a screw assembly. The first grinding mechanism, the second grinding mechanism and the third grinding mechanism are respectively installed on the machine base through three hinge assemblies, and the screw assembly drives the first grinding mechanism, the second grinding mechanism and the third grinding mechanism to approach or move away from the automatic feeding mechanism. The design of the hinge assembly and the screw assembly simplifies the maintenance process of the equipment and is easy to operate. Technicians can optimize the grinding parameters through simple adjustments, reduce downtime and maintain production continuity, and also reduce the risk of equipment damage caused by misoperation.

[0013] According to some embodiments of the present invention, the first front grinding assembly, the upper surface grinding assembly, the side surface grinding assembly, the lower surface grinding assembly, and the second back grinding assembly are each provided with two grinding wheels, and the two grinding wheels rotate in opposite directions. The grinding wheels rotating in opposite directions generate relatively balanced forces when contacting the workpiece, avoiding the problem of uneven surface that may be caused by single-direction grinding. The balanced action of this bidirectional force helps to achieve a more uniform grinding effect, ensuring that the surface of the welded part is smooth and has no obvious traces.

[0014] According to some embodiments of the present invention, the grinding wheel adopts a wire wheel structure. The wire wheel has strong grinding ability, but its relatively soft wire material can complete the grinding task without damaging the metal frame.

[0015] According to some embodiments of the present invention, the automatic feeding mechanism includes a closed-loop conveyor belt and a clamping seat. The clamping seat is installed on the closed-loop conveyor belt. The clamping seat includes a first limit block and a second limit block with a height difference. An accommodation cavity for the workpiece is formed between the two limit blocks, and the low height of the first limit block forms an introduction channel for the workpiece. This reduces the shaking or deviation of the workpiece on the closed-loop conveyor belt, improves the accuracy and consistency of feeding. The design combining the closed-loop conveyor belt and the clamping seat realizes the continuous automatic feeding function, greatly shortening the time interval between the feeding of the workpiece and the grinding process.

[0016] According to some embodiments of the present invention, the automatic feeding mechanism is arranged symmetrically with double conveyor belts. Two sets of the closed-loop conveyor belts and the clamping seats are symmetrically distributed along the conveying path of the workpiece. The symmetrical arrangement of the double conveyor belts can provide more stable support for the workpiece. Since there are conveyor belts and clamping seats acting together on both sides, this greatly reduces the inclination or shaking phenomenon that may occur during the conveying of the workpiece, ensuring that the workpiece can move smoothly and accurately along the predetermined path.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Brief Description of the Drawings

[0018] The following further describes the present invention in conjunction with the drawings and embodiments, where: Figure 1 is a schematic diagram of an automatic grinding production line for the oxide layer of a chair frame welding according to an embodiment of the present invention; Figure 2 is a schematic diagram of a grinding mechanism according to an embodiment of the present invention; Figure 3 is a schematic diagram of a conveying system according to an embodiment of the present invention; Figure 4 is a schematic diagram of a workpiece according to an embodiment of the present invention.

[0019] Reference numerals: first front grinding assembly 100; first back grinding assembly 110; upper surface grinding assembly 120; lower surface grinding assembly 130; side surface grinding assembly 140; second back grinding assembly 150; second front grinding assembly 160; grinding wheel 170; screw assembly 180; hinge assembly 190; rising section 200; translation section 210; descending section 220; first limit block 230; second limit block 240; closed-loop conveyor belt 250; foot tube 260; backrest tube 270; welding part 280. Detailed implementation manners

[0020] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0021] In the description of the present invention, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0022] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the number itself, and above, below, within, etc. are understood as including the number itself. If the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0023] In the description of the present invention, unless otherwise clearly defined, terms such as "arrangement", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution. In the description of the present invention, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0024] Referring to Figures 1 to 4 , an automatic grinding production line for the oxide layer of chair frame welding, comprising: A machine base; Workpieces, including a backrest tube 270 and a foot tube 260, the foot tube 260 includes a symmetrically arranged first V-shaped avoidance portion and a second V-shaped avoidance portion, and the foot tube 260 is fitted and welded between the first V-shaped avoidance portion and the second V-shaped avoidance portion to form a welding portion 280; A conveying system, installed on the machine base, the conveying system includes a feeding conveying mechanism, an automatic feeding mechanism, and a discharging conveying mechanism, the conveying system is used to convey workpieces, and the automatic feeding mechanism includes a rising section 200, a translation section 210, and a descending section 220; A grinding system, installed on the machine base, the grinding system includes a first grinding mechanism, a second grinding mechanism, and a third grinding mechanism, the first grinding mechanism is arranged corresponding to the rising section 200, the first grinding mechanism includes a first front grinding component 100 and a first back grinding component 110, the second grinding mechanism is arranged corresponding to the translation section 210, the second grinding mechanism includes an upper surface grinding component 120, a side surface grinding component 140, and a lower surface grinding component 130, the third grinding mechanism is arranged corresponding to the descending section 220, and the third grinding mechanism includes a second back grinding component 150 and a second front grinding component 160.

[0025] Through the combination of an integrated conveying system and a multi-stage grinding system, the whole process of automatic operation from workpiece feeding, automatic positioning, precise grinding to finished product discharging is realized. Compared with the traditional manual grinding method or semi-automatic equipment, the production efficiency and production capacity are greatly improved. The production line is designed with the first grinding mechanism, the second grinding mechanism and the third grinding mechanism specifically for the welding part 280 of the chair leg. Each grinding mechanism is further subdivided into grinding components for the front, back, upper surface, side surface and lower surface, which can comprehensively cover all areas of the special-shaped workpiece that need to be processed, ensuring the consistency and high efficiency of the grinding quality; The mechanical grinding method is used to remove the black skin at the welding part 280, effectively avoiding the pollution of the environment caused by the waste water and harmful gases generated during the pickling process, meeting the requirements of modern green manufacturing; Through the automatic grinding of the system, not only can the black skin generated by welding be effectively removed, but also the smoothness and flatness of the surface of the welding part 280 can be improved, facilitating the adhesion of the subsequent coating.

[0026] The first front grinding component 100 is arranged on the radial outer side of the rising section 200, the first back grinding component 110 is arranged on the radial inner side of the rising section 200, and the first front grinding component 100 and the second back grinding component 150 carry out cooperative grinding operations corresponding to the front and back of the welding part 280 respectively. By grinding the welding part 280 from both the front and back sides respectively, all oxide layers can be ensured to be removed, and the surface of the welding part 280 is made more uniform and smooth. Such a design helps to improve the appearance quality and service performance of the final product, meeting the requirements of high-standard furniture manufacturing.

[0027] The upper surface grinding component 120 and the lower surface grinding component 130 are respectively arranged on the upper and lower sides of the translation section 210 in the height direction, for synchronously grinding the upper surface and the lower surface of the welding part 280, and the side surface grinding component 140 is arranged on the radial outer side of the translation section 210, for laterally grinding the area of the backrest tube 270 close to the welding part 280. Integrating multiple grinding functions into one section simplifies the operation process and equipment structure, reduces the number of transfers of the workpiece between different processes, reduces the complexity and error rate in the production process, and also saves space, which is beneficial to reducing the cost of the factory building layout.

[0028] The second back grinding component 150 is arranged on the radial outer side of the descending section 220, and the second front grinding component 160 is arranged on the radial inner side of the descending section 220 to perform secondary grinding on the back and front of the welding part 280. The side surface grinding component 140 is located on the radial outer side of the translation section 210, specifically for laterally grinding the area of the backrest tube 270 close to the welding part 280. Such a layout can not only process the areas that are difficult to reach by the front and back grinding components, but also further optimize the appearance quality around the welding part 280 to ensure overall consistency.

[0029] The grinding system is also provided with a compensation component. The first grinding mechanism, the second grinding mechanism, and the third grinding mechanism are all installed on the machine base through the compensation component. The grinding system can quickly adapt to the needs of workpieces of different types and sizes without large-scale adjustment of the equipment, improving the versatility and flexibility of the production line, enabling the enterprise to respond more quickly to changes in market demand.

[0030] The compensation component includes a hinge component 190 and a screw component 180. The first grinding mechanism, the second grinding mechanism, and the third grinding mechanism are respectively installed on the machine base through three hinge components 190. The screw component 180 drives the first grinding mechanism, the second grinding mechanism, and the third grinding mechanism to approach or move away from the automatic feeding mechanism. The design of the hinge component 190 and the screw component 180 simplifies the maintenance process of the equipment and is easy to operate. Technicians can optimize the grinding parameters through simple adjustments, reduce downtime and maintain production continuity, and also reduce the risk of equipment damage caused by misoperation.

[0031] Both the first front grinding component 100, the upper surface grinding component 120, the side surface grinding component 140, the lower surface grinding component 130, and the second back grinding component 150 are provided with two grinding wheels 170, and the two grinding wheels 170 rotate in opposite directions. The grinding wheels 170 rotating in opposite directions will generate relatively balanced forces when contacting the workpiece, avoiding the problem of surface unevenness that may be caused by grinding in a single direction. The balanced effect of this two-way force helps to achieve a more uniform grinding effect, ensuring that the surface of the welded part 280 is smooth and has no obvious traces.

[0032] The grinding wheel 170 adopts a wire wheel structure. The wire wheel has strong grinding ability, but its relatively soft wire material can complete the grinding task without damaging the metal frame.

[0033] The automatic feeding mechanism includes a closed-loop conveyor belt 250 and a clamping seat. The clamping seat is installed on the closed-loop conveyor belt 250. The clamping seat includes a first limit block 230 and a second limit block 240 with a height difference. An accommodation cavity for the workpiece is formed between the two limit blocks, and the low height of the first limit block 230 forms an introduction channel for the workpiece. It reduces the shaking or offset of the workpiece on the closed-loop conveyor belt 250, improves the accuracy and consistency of feeding. The design of the combination of the closed-loop conveyor belt 250 and the clamping seat realizes the continuous automatic feeding function, greatly shortening the time interval between the feeding of the workpiece and the grinding process.

[0034] The automatic feeding mechanism adopts a symmetrical arrangement of double conveyor belts. Two sets of closed-loop conveyor belts 250 and clamping seats are symmetrically distributed along the conveying path of the workpiece. The symmetrical arrangement of the double conveyor belts can provide more stable support for the workpiece. Since there are conveyor belts and clamping seats acting together on both sides, this greatly reduces the inclination or shaking phenomenon that may occur during the conveying of the workpiece, ensuring that the workpiece can move forward smoothly and accurately along the predetermined path.

[0035] In this embodiment, the machine base serves as the basic structure of the entire production line and supports all components.

[0036] The workpiece includes a backrest tube 270 and a foot tube 260. The foot tube 260 is designed with symmetric first and second V-shaped avoidance portions to ensure that the foot tube 260 can be precisely fitted and welded onto the backrest tube 270 to form a welded portion 280.

[0037] The conveying system consists of a feeding conveying mechanism, an automatic feeding mechanism, and a discharging conveying mechanism. The automatic feeding mechanism particularly adopts the design of a closed-loop conveyor belt 250 and a clamping seat. The clamping seat is installed on the closed-loop conveyor belt 250 and includes a first limiting block 230 and a second limiting block 240 with a height difference therebetween, and a receiving cavity is formed therebetween for fixing the workpiece. The lower part of the first limiting block 230 forms an introduction channel for facilitating the entry of the workpiece. In addition, the double conveyor belts are symmetrically arranged, and the two sets of conveyor belts and clamping seats are symmetrically distributed along the conveying path of the workpiece, ensuring the stability and balance of the workpiece during the conveying process.

[0038] The grinding system includes a first grinding mechanism, a second grinding mechanism, and a third grinding mechanism, which are respectively arranged corresponding to the rising section 200, the translation section 210, and the descending section 220. Each grinding mechanism is equipped with specific grinding components, such as a first front grinding component 100, a first back grinding component 110, etc. These grinding components are both provided with two wire wheel structure grinding wheels 170 with opposite rotation directions, which can effectively remove the oxide layer without damaging the surface of the workpiece.

[0039] All the grinding mechanisms are installed on the machine base through a hinge assembly 190 and a screw assembly 180. The hinge assembly 190 allows the grinding mechanism to adjust the angle, while the screw assembly 180 drives the grinding mechanism to approach or move away from the automatic feeding mechanism to achieve precise distance control. This design not only improves the grinding accuracy but also enhances the adaptability and flexibility of the system.

[0040] The workpiece enters the production line through the feeding conveying mechanism.

[0041] The workpiece is placed in the clamping seat of the automatic feeding mechanism, accurately positioned through the accommodating cavity formed by the first limiting block 230 and the second limiting block 240, and smoothly conveyed to the next process through the closed-loop conveyor belt 250. In the ascending section 200, the first front grinding assembly 100 and the first back grinding assembly 110 simultaneously grind the front and back surfaces of the welding part 280. In the translation section 210, the upper surface grinding assembly 120 and the lower surface grinding assembly 130 synchronously grind the upper and lower surfaces of the welding part 280, and the side grinding assembly 140 laterally grinds the area of the back frame pipe 270 close to the welding part 280. In the descending section 220, the second back grinding assembly 150 and the second front grinding assembly 160 grind the back and front surfaces of the welding part 280 again to ensure the grinding effect. The workpiece after grinding leaves the production line through the discharging and conveying mechanism and is ready to enter the subsequent processing steps.

[0042] Through the application of an integrated conveying system, a multi-stage grinding system, and a compensation component, the full-automatic operation from workpiece feeding to finished product discharging is realized, greatly improving the production efficiency and product quality, and at the same time reducing environmental pollution and labor costs.

[0043] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those of ordinary skill in the art.

Claims

1. An automatic grinding production line for the oxide layer of chair frame welding, characterized in that, Including: Machine base; Workpiece, including a backrest tube and a foot tube, the foot tube includes symmetrically arranged first V-shaped avoidance portions and second V-shaped avoidance portions, and the foot tube is fitted and welded between the first V-shaped avoidance portion and the second V-shaped avoidance portion to form a welded portion; Conveying system, installed on the machine base, the conveying system includes a feeding conveying mechanism, an automatic feeding mechanism and a discharging conveying mechanism, the conveying system is used to convey the workpiece, and the automatic feeding mechanism includes a rising section, a translation section and a descending section; Grinding system, installed on the machine base, the grinding system includes a first grinding mechanism, a second grinding mechanism and a third grinding mechanism, the first grinding mechanism is arranged corresponding to the rising section, the first grinding mechanism includes a first front grinding component and a first back grinding component, the second grinding mechanism is arranged corresponding to the translation section, the second grinding mechanism includes an upper surface grinding component, a side surface grinding component and a lower surface grinding component, the third grinding mechanism is arranged corresponding to the descending section, and the third grinding mechanism includes a second back grinding component and a second front grinding component.

2. The automatic grinding production line for chair frame welding oxide layer according to claim 1 is characterized in that: The first front grinding component is arranged on the radial outer side of the rising section, the first back grinding component is arranged on the radial inner side of the rising section, and the first front grinding component and the second back grinding component respectively perform cooperative grinding operations corresponding to the front and back of the welded portion.

3. An automatic grinding production line for the oxide layer of chair frame welding according to claim 1, characterized in that The upper surface grinding component and the lower surface grinding component are respectively arranged on the upper and lower sides of the translation section in the height direction, and are used for synchronously grinding the upper surface and the lower surface of the welded portion, and the side surface grinding component is arranged on the radial outer side of the translation section, and is used for laterally grinding the area of the backrest tube close to the welded portion.

4. An automatic grinding production line for the oxide layer of a chair frame welding, as described in claim 1, wherein The second back grinding component is arranged on the radial outer side of the descending section, and the second front grinding component is arranged on the radial inner side of the descending section to perform secondary grinding on the back and front of the welded portion.

5. An automatic grinding production line for the welding oxide layer of a chair frame according to claim 1, characterized in that, The grinding system is also provided with a compensation component, and the first grinding mechanism, the second grinding mechanism and the third grinding mechanism are all installed on the machine base through the compensation component.

6. The automatic grinding production line for the oxide layer of chair frame welding according to claim 5, characterized in that, The compensation component includes a hinge component and a screw component, the first grinding mechanism, the second grinding mechanism and the third grinding mechanism are respectively installed on the machine base through three hinge components, and the screw component drives the first grinding mechanism, the second grinding mechanism and the third grinding mechanism to approach or move away from the automatic feeding mechanism.

7. The automatic grinding production line for chair frame welding oxide layer according to claim 1 is characterized in that: The first front grinding component, the upper surface grinding component, the side surface grinding component, the lower surface grinding component and the second back grinding component are all provided with two grinding wheels, and the two grinding wheels rotate in opposite directions.

8. An automatic grinding production line for the welding oxide layer of a chair frame according to claim 7, characterized in that The grinding wheel adopts a wire wheel structure.

9. The automatic grinding production line for chair frame welding oxide layer according to claim 1 is characterized in that: The automatic feeding mechanism includes a closed-loop conveyor belt and a clamping seat, the clamping seat is installed on the closed-loop conveyor belt, the clamping seat includes a first limit block and a second limit block arranged with a height difference, and a placement cavity for the workpiece is formed between the two limit blocks, and the low height of the first limit block forms an introduction channel for the workpiece.

10. The automatic grinding production line for chair frame welding oxide layer according to claim 9 is characterized in that: The automatic feeding mechanism adopts a symmetrical arrangement of double conveyor belts, and the two sets of the closed-loop conveyor belts and the clamping seats are symmetrically distributed along the conveying path of the workpiece.

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