Shaft sleeve positioning welding device for welding production line

Abstract

A shaft sleeve positioning and welding device for a welding production line comprises a workbench, a welding mechanism erected above the workbench, a conveying mechanism installed on the workbench and a feeding mechanism installed on one side of the workbench. The workbench is sequentially divided into a material preparation area for placing a chair leg body, a first welding area for positioning and welding a shaft sleeve and a second welding area for completely welding the shaft sleeve, the shaft sleeve is welded in steps, firstly, the shaft sleeve is preliminarily positioned on the chair leg body through three-point positioning and welding, so that the generation of internal stress can be effectively reduced; according to the chair leg, the shaft sleeve is arranged on the chair leg body, the matching degree between the shaft sleeve and the chair leg body is improved, then the shaft sleeve is completely welded to the chair leg body through segmented arc welding, internal stress generated in the arc welding process can be kept relatively balanced, stress deformation is reduced, and therefore the size and shape changes are avoided; and the welding steps can be synchronously connected in series through synchronous transfer of the conveying mechanism, so that the welding efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chair leg production, in particular to a shaft sleeve positioning welding device used in a welding production line. Background Art

[0002] The applicant has previously developed a molding process for one-piece chair legs. Referring to the Chinese patent application document with patent application number CN202211288191.7, the molding process includes a plate cutting process and a stamping process arranged in sequence, and a fixing seat and a plurality of supporting legs are simultaneously stamped and bent using the same first metal plate by stamping, so that the fixing seat and the plurality of supporting legs are integrally formed. The processing flow of the chair legs also includes an accessory welding process located after the stamping process; it is necessary to weld a bushing for inserting a pneumatic rod in the middle position of the chair leg body, and weld an inner bone for improving the supporting strength in the five supporting legs of the chair leg body to obtain a complete chair leg.

[0003] In the traditional sleeve welding process, the connection between the sleeve and the chair foot body is usually completed in one step around the sleeve. Although this welding process can ensure welding efficiency and thus increase production, the one-step welding forming method will affect the welding quality and yield rate. During the welding process, due to the effects of thermal stress and residual stress, the sleeve and the chair foot body may change in size and shape, thereby affecting the fit between the sleeve and the chair foot body, and also affecting the normal use of the chair foot. However, if the sleeve is welded in sections, the welding efficiency will be greatly reduced, affecting the production schedule. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a shaft sleeve positioning welding device for a welding production line.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A shaft sleeve positioning welding device for a welding production line comprises a workbench, a welding mechanism mounted above the workbench, a conveying mechanism installed on the workbench and a loading mechanism installed on one side of the workbench, wherein the workbench is sequentially divided into a preparation area for placing a chair foot body, a first welding area for positioning welding of the shaft sleeve and a second welding area for completely welding the shaft sleeve, wherein the loading mechanism is installed on one side of the first welding area, wherein the first welding area and the second welding area both comprise a welding turntable, a frame and a clamping mechanism with the same structure, wherein the welding turntable is rotatably mounted on the workbench, the clamping mechanism is mounted above the workbench, the clamping mechanism is mounted on the frame, and the clamping mechanism clamps the shaft sleeve onto the chair foot body; wherein the welding mechanism comprises a positioning welding machine respectively mounted in the first welding area and an arc welding machine mounted in the second welding area, wherein the welding turntable in the first welding area cooperates with the positioning welding machine to perform three-point positioning welding on the shaft sleeve, and the welding turntable in the second welding area cooperates with the arc welding machine to perform arc welding on the shaft sleeve.

[0007] In the utility model, the welding turntable in the first welding zone pauses for 2-3s after each rotation of 120°, during which the positioning welding machine spot welds the shaft sleeve and repeats this three times; the welding turntable in the second welding zone rotates 120° at a uniform speed and then accelerates to rotate 120°, during which the arc welding machine performs arc continuous welding on the shaft sleeve and repeats this three times.

[0008] In the utility model, the conveying mechanism includes at least three lifting rods fixed on the workbench, a lifting frame horizontally installed on the top of the lifting rods, a mobile frame slidably fitted on the lifting frame, and three groups of supporting frames fixed on the mobile frame. The three groups of supporting frames are respectively installed in the material preparation area, the first welding area and the second welding area. It also includes a driving mechanism for driving the mobile frame to move horizontally along the lifting frame. The driving mechanism drives the mobile frame to move by means of a screw transmission.

[0009] In the utility model, the clamping mechanism includes a connecting seat fixedly connected to the frame, a push rod installed on the connecting seat and a pressing shaft connected to the push rod. The pressing shaft is located directly above the welding turntable and is driven to move up and down by the push rod.

[0010] Furthermore, a detachable pressure block is provided at the bottom of the pressure shaft, and the pressure block includes a pressure plate with a diameter greater than the outer diameter of the sleeve and a limit block with a diameter equal to the inner diameter of the sleeve. The limit block is connected to the bottom of the pressure plate and the two are integrally formed. When the pressure shaft moves downward, it drives the pressure block downward, and the limit block extends into the sleeve to limit it in the horizontal direction, and the pressure plate presses against the upper end surface of the sleeve to limit it in the vertical direction.

[0011] In the utility model, the feeding mechanism includes a vibration plate for arranging and feeding the shaft sleeves, an arrangement groove connected to the discharge port of the vibration plate, and a grabbing mechanism installed on a frame. The vibration plate outputs the scattered shaft sleeves to the arrangement groove for vertical arrangement, and the grabbing mechanism delivers the shaft sleeves in the arrangement groove to the center of the chair foot body in sequence.

[0012] Furthermore, the grabbing mechanism includes a guide plate fixed on the frame, a slider mounted on the guide plate for horizontal sliding, a connecting plate mounted on the slider for vertical sliding, and a pneumatic finger mounted on the lower end of the connecting plate. The guide plate extends horizontally from the outside to the inside into the first welding area. Under normal circumstances, the slider is located on the outside of the first welding area. When the sleeve is loaded, the connecting plate drives the pneumatic fingers to move downward, and the pneumatic fingers extend into the inner side of the sleeve and stretch outward to grab the sleeve. The connecting plate rises to lift the sleeve, and the slider moves along the guide plate to the first welding area. When the sleeve is sent to the center position of the welding turntable, the connecting plate moves downward to control the pneumatic fingers to release and place the sleeve on the chair foot body.

[0013] Furthermore, the slider is driven on the guide plate by a screw drive, and the connecting plate is driven on the slider by an electric push rod.

[0014] The utility model has the following advantages and beneficial effects:

[0015] The welding of the sleeve is carried out in steps. First, the sleeve is initially positioned on the chair foot body through three-point positioning welding. This can effectively reduce the generation of internal stress and improve the fit between the sleeve and the chair foot body. Then, the sleeve is completely welded to the chair foot body through segmented arc welding. The internal stress generated during arc welding can maintain a relative balance, reducing stress deformation and avoiding changes in size and shape. Not only that, the synchronous transfer of the conveying mechanism can realize the synchronous series connection of the welding steps, thereby improving the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0017] Figure 1 Schematic diagram of the welding production line in this embodiment;

[0018] Figure 2 is a top view of the second welding area in this embodiment;

[0019] Figure 3 Schematic diagram of the conveying mechanism in this embodiment;

[0020] Figure 4 is a schematic diagram of the clamping device in this embodiment;

[0021] Figure 5Schematic diagram of the grabbing mechanism in this embodiment. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model, but the utility model is not limited to the following embodiments.

[0023] like Figures 1 to 5 As shown, this embodiment discloses a sleeve positioning welding device for a welding production line, comprising a workbench 1, a welding mechanism 2 mounted above the workbench 1, a conveying mechanism 3 installed on the workbench 1, and a loading mechanism 4 installed on one side of the workbench 1, wherein the workbench 1 is sequentially divided into a preparation area 5 for placing a chair foot body, a first welding area 6 for positioning welding of the sleeve, and a second welding area 7 for complete welding of the sleeve, wherein the loading mechanism 4 is installed on one side of the first welding area 6 for loading the sleeve, wherein the first welding area 6 and the second welding area 7 both include a welding turntable 11, a frame 12, and a clamping mechanism 13 having the same structure, wherein the welding turntable 11 is rotatably mounted on the workbench 1, the clamping mechanism 13 is mounted above the workbench 1, and the clamping mechanism 13 is installed on the frame 12. When the chair foot body is placed on the welding turntable 11, the bushing is pressed onto the chair foot body by the clamping mechanism 13 for welding; the welding mechanism 2 includes a positioning welding machine 21 installed in the first welding area 6 and an arc welding machine 22 installed in the second welding area 7, the welding turntable 11 in the first welding area 6 cooperates with the positioning welding machine 21 to perform three-point positioning welding on the bushing, and the welding turntable 11 in the second welding area 7 cooperates with the arc welding machine 22 to perform arc complete welding on the bushing; when the welding work in the corresponding area is completed, the conveying mechanism 3 synchronously moves the chair foot body in the preparation area 5 to the first welding area 6, moves the chair foot body in the first welding area 6 to the second welding area 7, and outputs the chair foot body in the second welding area 7 for unloading.

[0024] In this embodiment, the welding turntable 11 of the first welding area 6 pauses for 2-3 seconds after each rotation of 120°. During the pause, the positioning welding machine 21 spot-welds the sleeve. After three spot weldings, a set of welding processes is completed. At this time, the sleeve is preliminarily positioned on the chair foot body. The uniform three-point positioning can effectively reduce the generation of internal stress and improve the fit between the sleeve and the chair foot body; the welding turntable 11 of the second welding area 7 rotates 120° at a uniform speed and then accelerates to rotate 120°. During the uniform rotation, the arc welding machine 22 performs arc continuous welding on the sleeve. After repeating three times, the sleeve is completely welded to the chair foot body. By decomposing the welding parts and performing welding in steps, the internal stress generated during welding can be kept relatively balanced, thereby reducing stress deformation.

[0025] In this embodiment, the conveying mechanism 3 includes at least three lifting rods 30 fixed on the workbench 1, a lifting frame 31 horizontally installed on the top of the lifting rod 30, a mobile frame 32 slidably fitted on the lifting frame 31 and three groups of supporting frames 33 fixed on the mobile frame 32. The three groups of supporting frames 33 are respectively installed in the preparation area 5, the first welding area 6 and the second welding area 7. It also includes a driving mechanism 34 for driving the mobile frame 32 to move horizontally along the lifting frame 31. The driving mechanism 34 includes a driving motor 341 fixed on the lifting frame 31, a screw rod 342 connected to the driving motor 341 and a slider 343 sleeved on the screw rod 342. The slider 343 is threadedly fitted with the screw rod 342. The slider 343 is fixedly connected to the mobile frame 32. When the driving motor 341 rotates, the slider 343 is driven to move horizontally through the screw rod 342, and the slider 343 drives the mobile frame 32 to move.

[0026] In this embodiment, the clamping mechanism 13 includes a connecting seat 131 fixedly connected to the frame 12, a push rod 132 installed on the connecting seat 131, and a pressing shaft 133 connected to the push rod 132. The pressing shaft 133 is located directly above the welding turntable 11. The pressing shaft 133 is driven to move up and down by the push rod 132. The push rod 132 is a common electric push rod on the market.

[0027] Furthermore, a detachable pressing block 134 is provided at the bottom of the pressing shaft 133, and the pressing block 134 includes a pressing plate 135 with a diameter larger than the outer diameter of the sleeve and a limiting block 136 with a diameter equal to the inner diameter of the sleeve. The limiting block 136 is connected to the bottom of the pressing plate 135 and the two are integrally formed. When the pressing shaft 133 moves downward, it drives the pressing block 134 to be pressed downward. At this time, the limiting block 136 extends into the sleeve to limit it in the horizontal direction, and the pressing plate 135 presses against the upper end surface of the sleeve to limit it in the vertical direction. By arranging the pressing plate 135 and the limiting block 136 on the pressing block 134 to limit the sleeve in all directions, the positioning effect can be improved. At the same time, the detachable pressing block 134 can also be matched and replaced according to the size of the sleeve.

[0028] In this embodiment, the feeding mechanism 4 includes a vibration plate 41 for arranging and feeding the sleeves, an arrangement groove 42 connected to the discharge port of the vibration plate 41, and a grabbing mechanism 43 installed on the frame 12. The vibration plate 41 continuously outputs the scattered sleeves to the arrangement groove 42 for vertical arrangement through orderly vibration, and the grabbing mechanism 43 delivers the sleeves in the arrangement groove 42 to the center of the chair foot body in sequence.

[0029] Furthermore, the gripping mechanism 43 includes a guide plate 431 fixed on the frame 12, a moving block 432 horizontally slidably mounted on the guide plate 431, a connecting plate 433 vertically slidably mounted on the moving block 432, and a pneumatic finger 434 mounted at the lower end of the connecting plate 433. The guide plate 431 horizontally extends from the outside to the inside into the first welding area 6. Under normal circumstances, the moving block 432 is located on the outside of the first welding area 6. When the sleeve is loaded, the connecting plate 433 drives the pneumatic finger 434 to move downward. The movable finger 434 extends into the inner side of the sleeve and grabs the sleeve by spreading the fingers outward, then the connecting plate 433 rises to lift the sleeve, and the moving block 432 moves along the guide plate 431 to the first welding area 6. When the sleeve is sent to the center position of the welding turntable 11, the connecting plate 433 moves down to place the sleeve on the chair foot body. Specifically, the moving block 432 is driven on the guide plate 431 by the screw rod 342, and the connecting plate 433 is driven up and down on the moving block 432 by the electric push rod.

[0030] The above contents described in this specification are merely examples of the present invention. Technicians in the technical field to which the present invention belongs can make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the contents of the present invention specification or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A sleeve positioning welding device for a welding production line, characterized in that: The invention comprises a workbench (1), a welding mechanism (2) mounted above the workbench (1), a conveying mechanism (3) mounted on the workbench (1), and a loading mechanism (4) mounted on one side of the workbench (1), wherein the workbench (1) is divided into a preparation area (5) for placing a chair foot body, a first welding area (6) for positioning welding of a shaft sleeve, and a second welding area (7) for completely welding the shaft sleeve, wherein the loading mechanism (4) is mounted on one side of the first welding area (6), and the first welding area (6) and the second welding area (7) both comprise a welding turntable (11), a frame (12), and a clamping mechanism (13) of the same structure, wherein the welding turntable ( The seat frame (12) is provided with a plurality of seats, each of which is provided with a plurality of seats. The seat frame (12) is provided with a plurality of seats, each of which is provided with a plurality of seats. The seat frame (12) is provided with a plurality of seats, each of which is provided with a plurality of seats. The seat frame (12) is provided with a plurality of seats, each of which is provided with a plurality of seats. The seat frame (12) is provided with a plurality of seats, each of which is provided with a plurality of seats. The seat frame (12) is provided with a plurality of seats, each of which is provided with a plurality of seats.

2. The sleeve positioning welding device for a welding production line according to claim 1, characterized in that: The welding turntable (11) of the first welding zone (6) pauses for 2-3 seconds after each rotation of 120°, during which the positioning welding machine (21) spot welds the shaft sleeve and repeats this process three times; the welding turntable (11) of the second welding zone (7) rotates 120° at a constant speed and then accelerates to rotate 120°, during which the arc welding machine (22) performs arc continuous welding on the shaft sleeve and repeats this process three times.

3. The sleeve positioning welding device for a welding production line according to claim 1, characterized in that: The conveying mechanism (3) comprises at least three lifting rods (30) fixed on the workbench (1), a lifting frame (31) horizontally mounted on the top of the lifting rods (30), a moving frame (32) slidably engaged with the lifting frame (31), and three groups of supporting frames (33) fixed on the moving frame (32), wherein the three groups of supporting frames (33) are respectively mounted in the material preparation area (5), the first welding area (6), and the second welding area (7), and further comprises a driving mechanism (34) for driving the moving frame (32) to move horizontally along the lifting frame (31), wherein the driving mechanism (34) drives the moving frame (32) to move by means of a screw rod (342).

4. The sleeve positioning welding device for a welding production line according to claim 1, characterized in that: The clamping mechanism (13) comprises a connecting seat (131) fixedly connected to the frame (12), a push rod (132) mounted on the connecting seat (131), and a pressing shaft (133) connected to the push rod (132); the pressing shaft (133) is located directly above the welding turntable (11); and the pressing shaft (133) is driven to move up and down by the push rod (132).

5. The sleeve positioning welding device for a welding production line according to claim 4, characterized in that: A detachable pressing block (134) is provided at the bottom of the pressing shaft (133). The pressing block (134) comprises a pressing plate (135) having a diameter greater than the outer diameter of the shaft sleeve and a limiting block (136) having a diameter equal to the inner diameter of the shaft sleeve. The limiting block (136) is connected to the bottom of the pressing plate (135) and the two are integrally formed. When the pressing shaft (133) moves downward, it drives the pressing block (134) to press downward. The limiting block (136) extends into the shaft sleeve to limit it in the horizontal direction. The pressing plate (135) presses against the upper end surface of the shaft sleeve to limit it in the vertical direction.

6. The sleeve positioning welding device for a welding production line according to claim 1, characterized in that: The feeding mechanism (4) comprises a vibration plate (41) for arranging and feeding the shaft sleeves, an arrangement groove (42) connected to the discharge port of the vibration plate (41), and a gripping mechanism (43) mounted on the frame (12); the vibration plate (41) outputs the scattered shaft sleeves to the arrangement groove (42) for vertical arrangement; and the gripping mechanism (43) sequentially delivers the shaft sleeves in the arrangement groove (42) to the center of the seat foot body.

7. The sleeve positioning welding device for a welding production line according to claim 6, characterized in that: The gripping mechanism (43) comprises a guide plate (431) fixed on the frame (12), a moving block (432) mounted on the guide plate (431) for horizontal sliding, a connecting plate (433) mounted on the moving block (432) for vertical sliding, and a pneumatic finger (434) mounted on the lower end of the connecting plate (433), wherein the guide plate (431) extends horizontally from the outside to the inside into the first welding area (6), and under normal conditions, the moving block (432) is located outside the first welding area (6). The connecting plate (433) drives the pneumatic finger (434) to move downward, the pneumatic finger (434) extends into the inner side of the sleeve and stretches outward to grab the sleeve, the connecting plate (433) rises to lift the sleeve, and the moving block (432) moves along the guide plate (431) into the first welding area (6). When the sleeve is sent to the center position of the welding turntable (11), the connecting plate (433) moves downward to control the pneumatic finger (434) to release and place the sleeve on the chair foot body.

8. The sleeve positioning welding device for a welding production line according to claim 7, characterized in that: The moving block (432) is driven on the guide plate (431) by means of a screw rod (342), and the connecting plate (433) is driven on the moving block (432) by means of a push rod (132).

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