A chair leg automatic welding forming mechanical device

Abstract

The present invention relates to the field of automated welding technology, and discloses an automated welding and forming mechanical device for chair legs, comprising a welding head; a placement portion, the placement portion comprising a base, the base being equipped with a placement plate through a driving unit arranged on its upper surface, the placement plate being fitted with an external desktop through a placement groove provided inside the placement plate, and the notch of the placement groove being fixedly connected with an inclined plate, and a loading portion, the loading portion comprising a loading table. The automated welding and forming mechanical device for chair legs can effectively solve the problem in the prior art that the small-angle tilt welding between the chair legs and the desktop is generally performed by manual support or a specially designed welding fixture to fix the chair legs, which can keep the welding parts in the correct position and angle, and for the welding of the entire chair, the chair legs need to be individually subjected to four angle corrections and positioning clamps, which is labor-intensive and not conducive to the automated production rhythm.

Description

Technical Field

[0001] The invention relates to the technical field of automated welding, and in particular to an automated welding and forming mechanical device for chair legs. Background Art

[0002] Chair leg welding refers to connecting the components of the chair legs together through a welding process, which can be summarized as: the process of using welding technology to connect the metal components of the chair legs into a solid and stable overall structure, aiming to meet the structural strength and aesthetic requirements of the chair during use.

[0003] During the welding process of chair legs, it is usually necessary to perform a small angle welding between the chair legs and the table top in order to improve the overall stability of the subsequent chair. Generally, manual support or a special welding fixture is used to fix the chair legs to keep the welded parts in the correct position and angle. For the welding of the entire chair, the chair legs need to be individually angle-corrected and positioned four times, which is labor-intensive and not conducive to the automated production rhythm. Summary of the invention

[0004] Technical issues solved In view of the above-mentioned shortcomings of the prior art, the present invention provides an automatic welding and forming mechanical device for chair legs, which can effectively solve the problem in the prior art that the small-angle tilt welding between the chair legs and the table top is generally fixed by manual support or a specially designed welding fixture to keep the welding parts in the correct position and angle. For the welding of the entire chair, the chair legs need to be individually angle-corrected and positioned four times, which is labor-intensive and not conducive to the automated production rhythm. Technical Solution

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a chair leg automatic welding and forming mechanical device, comprising: Welding head; A placement portion, the placement portion comprising a base, the base being provided with a placement plate through a driving unit arranged on an upper surface thereof, the placement plate being fitted with an external desktop through a placement groove provided inside the base, and a notch of the placement groove being fixedly connected with an inclined plate; A loading part, the loading part includes a loading platform, the bottom of the loading platform is fixedly connected to the upper surface of the base, the upper surface of the loading platform is fixedly connected to a loading rack assembly that can be used to guide the external chair legs to slide through a mounting plate, and the interior of the loading rack assembly is slidably connected to a clamp that can be used to clamp the external chair legs for loading; Wherein, the main body of the clamp adopts a detachable structure.

[0006] Furthermore, the loading rack assembly includes a material guide rack, a connecting rack and a material storage rack. The lower surface of the material guide rack is fixedly connected to the upper surface of the loading platform via a mounting plate, the lower surface of the material storage rack is fixedly connected to the upper surface of the loading platform, the material guide rack and the material storage rack are connected via a connecting rack, and the placement directions of the material guide rack and the material storage rack are parallel, and a material guide hole is opened on the top of the connecting rack close to the placement plate.

[0007] Furthermore, the material guide frame and the connecting frame are rotatably connected to a limit plate through a side groove provided therein, the top of the limit plate is connected to the inside of the connecting frame through a torsion spring, and the bottom of the limit plate is connected to the inside of the material guide frame through a torsion spring. In an initial state, the limit plate coincides with the channel center line of the connecting frame.

[0008] Furthermore, the fixture includes a first right-angle die and a second right-angle die, the bottom of the first right-angle die is slidably connected to the inner wall of the material guide frame, the upper surface of the loading platform is fixedly connected with a telescopic unit, the output end of the telescopic unit is equipped with a universal rod connected to the outer surface of the first right-angle die, and the universal rod is connected to the outer surface of the first right-angle die through a bending spring arranged on its outer surface, and the bending spring is provided with two and is symmetrically distributed up and down with the universal rod as the center.

[0009] Furthermore, the second right-angle mold is connected to the side of the connecting frame by a reset telescopic rod arranged on its outer surface, and the reset telescopic rod is provided with two and distributed up and down on the outer surface of the second right-angle mold, the output length of the reset telescopic rod located at the bottom is greater than the output length of the reset telescopic rod located at the top, the output end of the reset telescopic rod located at the top is rotatably connected to the outer surface of the second right-angle mold, and the second right-angle mold is slidably connected inside with a mounting seat that rotates with the output end of the reset telescopic rod located at the bottom.

[0010] Furthermore, the bottom damping sliding connection of the first right-angle mold is provided with an anti-slip plate, the anti-slip plate is designed with an oblique opening on the side close to the second right-angle mold, the anti-slip plate passes through the first right-angle mold on the side away from the oblique opening and is fixedly connected with a counterweight block, and the inner wall of the material guide frame is fixedly connected with a magnetic block that repels the counterweight block with magnetic force.

[0011] Furthermore, a V-shaped groove is provided on the inner side of the second right-angle mold, a V-shaped strip engaged with the V-shaped groove is fixedly connected to the side of the first right-angle mold away from the universal rod, and the inclined surface of the first right-angle mold fits with the inclined surface of the second right-angle mold. Beneficial Effects

[0012] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The present invention is provided with a feeding part, the output end of the telescopic unit drives the universal rod, the bending spring, and the first right-angle mold to move forward synchronously, the first right-angle mold slides forward, drives the counterweight block and the anti-slip plate to move forward synchronously, the anti-slip plate can be quickly inserted into the bottom of the chair leg, and drives the chair leg to move forward synchronously. After a short-distance sliding, the inclined surface of the first right-angle mold drives the chair leg to quickly snap into the second right-angle mold, the first right-angle mold and the second right-angle mold are quickly combined into a whole with the help of the "inclined surface", V-shaped strips, and V-shaped grooves, and the chair leg is "circumferentially wrapped", and the anti-slip plate is cooperated to drive the chair leg to move horizontally. Subsequently, the first right-angle mold, the second right-angle mold and the chair leg move synchronously, and the upper reset telescopic rod and the lower reset telescopic rod extend and retract synchronously. When the upper reset telescopic rod is extended to the maximum value, the top of the chair leg stops moving. With the further push of the universal rod, the lower reset telescopic rod is further extended for a distance, and the chair leg moves to the specified position and completes the angle correction. Under the action of gravity, the counterweight block drives the anti-slip plate to slowly separate from the bottom end of the first right-angle mold, completing the angle correction and positioning clamping of the chair leg at one time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention; Figure 2 It is a schematic diagram of a three-dimensional multi-angle structure of an embodiment of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the placing plate and the tilting plate according to an embodiment of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the placement part and the loading part of an embodiment of the present invention; Figure 5 It is a structural schematic diagram of a three-dimensional partial cross-section of a material guide frame according to an embodiment of the present invention; Figure 6 It is a structural schematic diagram of a front view of a clamp according to an embodiment of the present invention; Figure 7 This is a schematic structural diagram of a second right-angle mold solid according to an embodiment of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the first right-angle mold, the bending spring and the universal rod according to an embodiment of the present invention.

[0015] The numbers in the figure represent: 1. welding head; 2. placement part; 21. base; 22. driving unit; 23. placement plate; 24. tilting plate; 3. loading part; 31. loading platform; 32. loading rack assembly; 321. material guide rack; 3211. magnetic block; 322. connecting rack; 3221. material guide hole; 323. material storage rack; 324. limiting plate; 33. clamp; 331. first right-angle mold; 3311. anti-drop plate; 3312. counterweight block; 3313. V-shaped bar; 332. second right-angle mold; 3321. mounting seat; 3322. V-shaped groove; 4. telescopic unit; 41. universal rod; 42. bending spring; 43. resetting telescopic rod. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The present invention will be further described below in conjunction with the embodiments. Example

[0018] See also Figure 1-Figure 8 The present invention provides a technical solution: a chair leg automatic welding and forming mechanical device, comprising: Welding head 1; The placing part 2 includes a base 21, and the base 21 is provided with a placing plate 23 through a driving unit 22 arranged on the upper surface thereof. The placing plate 23 is fitted with the external desktop through a placing groove provided inside the placing plate 23, and the notch of the placing groove is fixedly connected with an inclined plate 24; The loading part 3 includes a loading platform 31, the bottom of which is fixedly connected to the upper surface of the base 21, and a loading frame assembly 32 for guiding the external chair legs to slide is fixedly connected to the upper surface of the loading platform 31 through a mounting plate, and a clamp 33 for clamping the external chair legs for loading is slidably connected inside the loading frame assembly 32; The main body of the clamp 33 adopts a detachable structure.

[0019] The loading rack assembly 32 includes a guide rack 321, a connecting rack 322 and a storage rack 323. The lower surface of the guide rack 321 is fixedly connected to the upper surface of the loading platform 31 through a mounting plate, and the lower surface of the storage rack 323 is fixedly connected to the upper surface of the loading platform 31. The guide rack 321 and the storage rack 323 are connected through the connecting rack 322, and the placement directions of the guide rack 321 and the storage rack 323 are parallel. A guide hole 3221 is provided on the top of the connecting rack 322 close to the placement plate 23.

[0020] The guide frame 321 and the connecting frame 322 are rotatably connected to the limit plate 324 through the side grooves opened therein. The top of the limit plate 324 is connected to the inside of the connecting frame 322 through a torsion spring, and the bottom of the limit plate 324 is connected to the inside of the guide frame 321 through a torsion spring. In the initial state, the channel center lines of the limit plate 324 and the connecting frame 322 coincide.

[0021] The fixture 33 includes a first right-angle die 331 and a second right-angle die 332. Since the structures of the first right-angle die 331 and the second right-angle die 332 are both designed at a right angle, the first right-angle die 331 can be detached from the second right-angle die 332 first. Then, the driving unit 22 drives the placement plate 23 and the chair legs to rotate synchronously to detach from the second right-angle die 332. The "right-angle design will not interfere with the rotation of the chair legs". Then, the second right-angle die 332 begins to reset. The bottom of the first right-angle die 331 is slidingly connected to the inner wall of the guide frame 321. The upper surface of the loading platform 31 is fixedly connected to the telescopic unit 4. The output end of the telescopic unit 4 is equipped with a universal rod 41 connected to the outer surface of the first right-angle die 331, and the universal rod 41 is connected to the outer surface of the first right-angle die 331 through a bending spring 42 arranged on its outer surface. Two bending springs 42 are provided and are symmetrically distributed up and down with the universal rod 41 as the center.

[0022] The second right-angle mold 332 is connected to the side of the connecting frame 322 through a reset telescopic rod 43 arranged on its outer surface. Two reset telescopic rods 43 are provided and are distributed up and down on the outer surface of the second right-angle mold 332. The output length of the reset telescopic rod 43 located at the bottom is greater than the output length of the reset telescopic rod 43 located at the top. The output end of the reset telescopic rod 43 located at the top is rotatably connected to the outer surface of the second right-angle mold 332. The second right-angle mold 332 is slidably connected inside with a mounting seat 3321 that rotates with the output end of the reset telescopic rod 43 located at the bottom.

[0023] The bottom damping sliding connection of the first right-angle mold 331 is provided with an anti-slip plate 3311, and the anti-slip plate 3311 is designed with an oblique opening on the side close to the second right-angle mold 332. The anti-slip plate 3311 penetrates the first right-angle mold 331 on the side away from the oblique opening and is fixedly connected with a counterweight block 3312. The inner wall of the material guide frame 321 is fixedly connected with a magnetic block 3211 that magnetically repels the counterweight block 3312.

[0024] A V-shaped groove 3322 is formed inside the second right-angle mold 332 . A V-shaped strip 3313 engaged with the V-shaped groove 3322 is fixedly connected to the first right-angle mold 331 away from the universal rod 41 . The inclined surface of the first right-angle mold 331 fits with the inclined surface of the second right-angle mold 332 .

[0025] refer to Figure 1-Figure 8 Usually, it is necessary to weld the chair legs to the tabletop at a small angle to improve the overall stability of the subsequent chair. Generally, manual support or a special welding fixture is used to fix the chair legs to keep the welded parts in the correct position and angle. For the welding of the entire chair, the chair legs need to be individually corrected and positioned four times, which is labor-intensive and not conducive to automated production rhythm. In order to overcome the above-mentioned defects, the present invention designs an automatic welding and forming mechanical device for chair legs.

[0026] Pre-loading process: The loading rack assembly 32 of the present invention includes three parts, namely, a guide rack 321, a connecting rack 322, and a storage rack 323. The storage rack 323 stores chair legs to be welded. When welding is required, the driving unit in the storage rack 323 first pushes the chair legs into the connecting rack 322. Then, the driving unit in the connecting rack 322 further pushes the chair legs forward (perpendicular to the movement direction in the storage rack 323) until the chair legs are pushed to the outer surface of the limiting plate 324 (fitting with the inner wall of the connecting rack 322), and the limiting plate 324 limits them. Since the bottom end of the chair leg adopts the "inclined mouth" design, the outer surface of the chair leg fits with the inner wall of the connecting rack 322. Under the action of gravity, the chair leg has a tendency to tilt toward the "inclined mouth", which is opposite to the opening direction of the guide hole 3221. At this time, the chair leg is stably located in the guide rack 321.

[0027] Positioning loading process: The telescopic unit 4 is started, and the output end of the telescopic unit 4 drives the universal rod 41, the bending spring 42, and the first right-angle mold 331 to move forward synchronously. In the initial state, the counterweight block 3312 is subjected to the magnetic repulsion of the magnetic block 3211, and the counterweight block 3312 fits the outer surface of the first right-angle mold 331 (the two are magnetically attracted together). As the first right-angle mold 331 slides forward, the counterweight block 3312 and the anti-slip plate 3311 are driven to move forward synchronously. Since the anti-slip plate 3311 is designed with an oblique opening on the side close to the second right-angle mold 332, and the bottom end of the chair leg is designed with an "inclined opening", the anti-slip plate 3311 can be quickly inserted into the bottom end of the chair leg and drive the chair leg to move forward synchronously. It should be noted that, in the initial state, the second right-angle mold 332 is in a reset state under the elastic force of the reset telescopic rod 43 (the upper and lower sets of reset telescopic rods 43 are completely reset), and the second right-angle mold 332 is in a vertical state. When the first right-angle mold 331, the anti-slip plate 3311, the counterweight block 3312 and the chair legs move forward synchronously, the limit plate 324 rotates under the thrust thereof, and the limit plate 324 can be quickly reset after being disengaged (the upper and lower ends of the limit plate 324 are respectively provided with two sets of torsion springs in opposite directions, which can realize bidirectional rotation or reset). After a short-distance sliding, the inclined surface of the first right-angle mold 331 drives the chair legs to quickly snap into the second right-angle mold 332. The first right-angle mold 331 and the second right-angle mold 332 are quickly combined into a whole with the help of the "inclined surface", the V-shaped strip 3313 and the V-shaped groove 3322, and the chair legs are "circumferentially wrapped", and the anti-slip plate 3311 is cooperated to drive the chair legs to move horizontally.

[0028] Subsequently, the first right-angle die 331, the second right-angle die 332 and the chair leg move synchronously, and the upper reset telescopic rod 43 and the lower reset telescopic rod 43 are retracted synchronously. When the upper reset telescopic rod 43 is extended to the maximum value, the top of the chair leg stops moving. With the further push of the universal rod 41, the lower reset telescopic rod 43 is further extended for a distance. At this time, the first right-angle die 331, the second right-angle die 332 and the chair leg as a whole begin to rotate at a small angle around the top of the upper reset telescopic rod 43, and the output end of the second right-angle die 332 rotates at a small angle around the mounting seat 3321 (the mounting seat 3321 is also short-circuited along the inside of the second right-angle die 332). The first right-angle die 331 is rotated at a small angle by means of the universal rod 41 and the bending spring 42 until the first right-angle die 331, the second right-angle die 332 and the chair leg stop moving. At this time, the chair leg moves to the specified position and the angle correction is completed. At the same time, after the first right-angle die 331 follows the tilt, the counterweight block 3312 drives the anti-slip plate 3311 to slowly separate from the bottom end of the first right-angle die 331 under the action of gravity, and the limit on the chair leg disappears. The first right-angle die 331 and the second right-angle die 332 slowly move downward along the cavity wrapped by the first right-angle die 331 and the second right-angle die 332 until the "inclined mouth" at the bottom end of the chair leg is tightly fitted on the upper surface of the desktop, completing the angle correction and positioning clamping of the chair leg at one time.

[0029] Cycle welding process: As can be seen from the above, the feeding part 3 can realize one-time angle correction and positioning clamping of the chair legs, and cooperate with the welding head 1 to quickly realize rapid automatic welding of the chair legs (it is still clamped during the welding process), and then cooperate with the reset cycle feeding of the feeding part 3 (after welding, since the structures of the first right-angle die 331 and the second right-angle die 332 are both designed at right angles, the first right-angle die 331 can be preferentially separated from the second right-angle die 332, and then, the driving unit 22 drives the placement plate 23 and the chair legs to rotate synchronously and separate from the second right-angle die 332, "the right-angle design will not interfere with the rotation of the chair legs", and then, the second right-angle die 332 begins to reset), the feeding part 3 cooperates with the placement part 2 to realize the automatic rotation loading and welding of the chair legs in sequence, eliminating the trouble of separate angle correction and positioning clamping, and has a high degree of automation.

[0030] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A chair leg automatic welding and forming mechanical device, characterized in that: include: Welding head (1); A placement portion (2), the placement portion (2) comprising a base (21), the base (21) being provided with a placement plate (23) via a drive unit (22) arranged on its upper surface, the placement plate (23) being fitted with an external desktop via a placement groove provided inside the placement plate, and a notch of the placement groove being fixedly connected to a tilting plate (24); A loading portion (3), the loading portion (3) comprising a loading platform (31), the bottom of the loading platform (31) being fixedly connected to the upper surface of the base (21), the upper surface of the loading platform (31) being fixedly connected to a loading rack assembly (32) for guiding the external chair legs to slide via a mounting plate, the interior of the loading rack assembly (32) being slidably connected to a clamp (33) for clamping the external chair legs for loading; Wherein, the main body of the clamp (33) adopts a detachable structure.

2. The automatic welding and forming mechanical device for chair legs according to claim 1, characterized in that: The loading rack assembly (32) comprises a material guide rack (321), a connecting rack (322) and a material storage rack (323); the lower surface of the material guide rack (321) is fixedly connected to the upper surface of the loading platform (31) via a mounting plate; the lower surface of the material storage rack (323) is fixedly connected to the upper surface of the loading platform (31); the material guide rack (321) and the material storage rack (323) are connected via the connecting rack (322); the placement directions of the material guide rack (321) and the material storage rack (323) are parallel; a material guide hole (3221) is provided on the top of the connecting rack (322) close to the placement plate (23).

3. The automatic welding and forming mechanical device for chair legs according to claim 2, characterized in that: The guide frame (321) and the connecting frame (322) are rotatably connected to a limit plate (324) via side grooves provided therein; the top of the limit plate (324) is connected to the inside of the connecting frame (322) via a torsion spring; the bottom of the limit plate (324) is connected to the inside of the guide frame (321) via a torsion spring; in an initial state, the channel center lines of the limit plate (324) and the connecting frame (322) coincide with each other.

4. The automatic welding and forming mechanical device for chair legs according to claim 2, characterized in that: The clamp (33) comprises a first right-angle die (331) and a second right-angle die (332); the bottom of the first right-angle die (331) is slidably connected to the inner wall of the material guide frame (321); the upper surface of the loading platform (31) is fixedly connected to a telescopic unit (4); the output end of the telescopic unit (4) is provided with a universal rod (41) connected to the outer surface of the first right-angle die (331); and the universal rod (41) is connected to the outer surface of the first right-angle die (331) via a bending spring (42) arranged on its outer surface; two bending springs (42) are provided and are symmetrically distributed up and down with the universal rod (41) as the center.

5. The automatic welding and forming mechanical device for chair legs according to claim 4, characterized in that: The second right-angle mold (332) is connected to the side of the connecting frame (322) via a reset telescopic rod (43) arranged on its outer surface. Two reset telescopic rods (43) are provided and are distributed up and down on the outer surface of the second right-angle mold (332). The output length of the reset telescopic rod (43) located at the bottom is greater than the output length of the reset telescopic rod (43) located at the top. The output end of the reset telescopic rod (43) located at the top is rotatably connected to the outer surface of the second right-angle mold (332). The second right-angle mold (332) is slidably connected to a mounting seat (3321) rotatable with the output end of the reset telescopic rod (43) located at the bottom.

6. The automatic welding and forming mechanical device for chair legs according to claim 4, characterized in that: The bottom of the first right-angle die (331) is connected to an anti-slip plate (3311) in a damping sliding manner; the anti-slip plate (3311) has an oblique opening design on a side close to the second right-angle die (332); the anti-slip plate (3311) penetrates the first right-angle die (331) on a side away from the oblique opening and is fixedly connected to a counterweight (3312); and a magnetic block (3211) that repel the counterweight (3312) is fixedly connected to an inner wall of the material guide frame (321).

7. The automatic welding and forming mechanical device for chair legs according to claim 4, characterized in that: A V-shaped groove (3322) is provided on the inner side of the second right-angle mold (332); a V-shaped strip (3313) engaging with the V-shaped groove (3322) is fixedly connected to the side of the first right-angle mold (331) away from the universal rod (41); and the inclined surface of the first right-angle mold (331) fits with the inclined surface of the second right-angle mold (332).

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