Automatic welding production line for chair legs

Abstract

An automatic welding production line for chair legs comprises a rack, a transfer mechanism installed on the rack, a feeding device, a shaft sleeve welding device and an inner frame welding device, wherein the feeding device, the shaft sleeve welding device and the inner frame welding device are sequentially installed on the rack at intervals. The mounting distance between two adjacent groups of devices is L; the feeding device turns over the unwelded chair leg body and then places the unwelded chair leg body on the bearing frame at the front end, the bearing frame moves the middle chair leg body with shaft sleeve welding completed to the inner frame welding device, and the rear chair leg body with shaft sleeve and inner frame welding completed to the discharging area for discharging. Manual feeding is replaced by the feeding device, manual welding is replaced by the shaft sleeve welding device and the inner bone welding device, and the three devices are connected in series through the transfer mechanism to achieve synchronous welding, so that the automatic process of a welding production line is achieved, the consistency of welded finished products can be improved, and the yield is increased; and meanwhile, synchronous welding is achieved through the transfer mechanism, the welding efficiency can be improved, the labor cost is reduced, and production accidents are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of chair leg production, in particular to an automatic welding production line for chair legs. 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 process, the welding steps of the sleeve and the inner frame are relatively cumbersome, requiring manual loading, positioning and welding. This manual welding method cannot guarantee the consistency of the finished welded product, has low welding efficiency and yield rate, and requires higher professionalism from welders, and has higher labor costs. Not only that, in long-term welding work, safety accidents may occur due to negligence, resulting in poor safety. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides an automatic welding production line for chair legs.

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

[0006] An automated welding production line for chair legs, comprising a frame and a transfer mechanism mounted on the frame, and also comprising a feeding device, a sleeve welding device and an inner frame welding device which are sequentially installed on the frame at intervals; the installation distance between two adjacent groups of devices is L; the transfer mechanism comprises a lifting frame for driving the chair leg body to move up and down, a transfer frame for driving the chair leg body to move horizontally and a supporting frame for supporting the chair leg body, the transfer frame is horizontally slidably mounted on the top of the lifting frame, and the supporting frame is provided with three groups, the three groups of the supporting frames are correspondingly installed at the positions of the three groups of devices, and the installation positions of the three groups of the supporting frames correspond to the front end, middle part and rear end of the transfer frame;

[0007] The loading device flips the unwelded chair foot body over and places it on the front support frame with the bottom facing upward. The lifting frame lifts the chair foot body through the support frame. The support frame moves a distance L to the end away from the loading device to move the chair foot body with the sleeve welding completed in the middle to the internal frame welding device, and the chair foot body with the sleeve and internal frame welding completed at the rear end is moved to the unloading area for unloading.

[0008] In the utility model, the transfer mechanism is provided with two groups, and the two groups of transfer mechanisms are respectively and parallelly and symmetrically arranged on both sides of the feeding device, the shaft sleeve welding device and the inner bone welding device.

[0009] In the utility model, a lifting cylinder for driving the lifting frame to rise and fall is provided at the bottom of the lifting frame, and a horizontal driving mechanism for driving the transfer frame to move horizontally is also provided on the lifting frame. The horizontal driving mechanism includes a driving motor arranged on the lifting frame, a screw rod connected to the driving motor, and a slider sleeved on the screw rod. The slider is threadedly matched with the screw rod, and the slider is fixedly connected to the transfer frame. When the driving motor rotates, the slider is driven to move horizontally through the screw rod, and the slider drives the transfer frame to move.

[0010] In the utility model, the sleeve welding device includes a first workbench rotatably mounted on a frame for placing a chair foot body, a sleeve feeding mechanism mounted on one side of the first workbench, and a sleeve clamping mechanism mounted above the first workbench. The sleeve feeding mechanism clamps the sleeve and delivers it to the center of the chair foot body on the first workbench. The sleeve clamping mechanism presses and positions the sleeve and then welds the connection position through a welding robot. The first workbench rotates while welding.

[0011] In the utility model, the internal bone welding device includes a second workbench rotatably installed on a frame for placing a chair foot body, an internal bone loading mechanism installed on one side of the second workbench, and an internal bone pressing mechanism mounted above the second workbench. The internal bone loading mechanism places the internal bone on the supporting feet of the chair foot body, and then rotates the second workbench to move the supporting feet downward to align with the internal bone loading mechanism. The internal bone loading mechanism repeats the loading action until all the supporting feet of the chair foot body are placed. After placement, the internal bone pressing mechanism presses all the internal bones on the chair foot body for welding.

[0012] Furthermore, the rotation angle of the second workbench is equal to 360° divided by the number of supporting legs.

[0013] Furthermore, the internal bone loading mechanism includes a material-forming mechanism for placing the internal bones and a mechanical arm for clamping the internal bones and feeding them. The material-forming mechanism includes a material-forming box with an inclined surface and a lifting block arranged at the bottom point of the inclined surface. A plurality of internal bones facing the same direction are arranged and placed on the inclined surface of the material-forming box. When the internal bones slide to the low point of the inclined surface, the lifting block is driven by the telescopic cylinder to lift the internal bones to the top of the material-forming box.

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

[0015] The loading device replaces manual loading, the sleeve welding device and the inner frame welding device replace manual welding, and the transfer mechanism connects the three devices in series to achieve synchronous welding. This not only realizes the automation process of the welding production line, but also improves the consistency of the welded products and the yield rate. At the same time, the synchronous welding achieved by the transfer mechanism can also improve the welding efficiency, reduce labor costs and avoid the occurrence of production accidents. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 1 is a top view of the welding production line in this embodiment;

[0018] Figure 2 Schematic diagram of the transfer mechanism in this embodiment;

[0019] Figure 3 Schematic diagram of the shaft sleeve welding device in this embodiment;

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

[0021] Figure 5 Schematic diagram of the material-forming 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 5As shown, this embodiment discloses an automated welding production line for chair legs, comprising a frame 1, a feeding device 2 installed on the frame 1, a sleeve welding device 3 and an inner frame welding device 4, the three groups of devices are sequentially connected by a transfer mechanism 5 installed on the frame 1, and the installation distance between two adjacent groups of devices in the three groups of devices is L, the sleeve welding device 3 and the inner frame welding device 4 both use welding robots instead of manual welding to improve consistency; the transfer mechanism 5 is provided with two groups, the two groups of transfer mechanisms 5 are respectively arranged in parallel and symmetrically on both sides of the three groups of devices, and each group of the transfer mechanism The seat foot body comprises a lifting frame 51 for driving the seat foot body to move up and down, a transfer frame 52 for driving the seat foot body to move horizontally, and a support frame 53 for supporting the seat foot body. The transfer frame 52 is horizontally slidably installed on the top of the lifting frame 51. Three groups of support frames 53 are provided corresponding to the interval positions of the above three groups of devices. The installation positions of the three groups of support frames 53 correspond to the front end, middle part and rear end of the transfer frame 52. When the sleeve welding device 3 and the inner bone welding device 4 complete the corresponding welding work, the feeding device 2 turns over the unwelded seat foot body and places it on the front end support frame 53 with the bottom facing upward. When the transfer mechanism 5 rises, the support frame 53 in the middle and the support frame 53 at the rear end rise synchronously, and respectively lift the chair foot body on the sleeve welding device 3 and the chair foot body on the inner frame welding device 4, and then the transfer frame 52 drives the chair foot bodies on the three support frames 53 to move a distance L to the end away from the feeding device 2. At this time, the chair foot body that has not been welded at the front end is moved to the sleeve welding device 3 for sleeve welding, the chair foot body in the middle that has completed sleeve welding is moved to the inner frame welding device 4 for inner frame welding, and the chair foot body that has completed sleeve and inner frame welding at the rear end is moved to the inner frame welding device 4 for inner frame welding. The body is moved to the unloading area for unloading; it should be noted that the moving distance L is the same as the installation distance L, and the length of L can be set according to the installation position of the three groups of devices. The loading device 2 replaces manual loading, the sleeve welding device 3 and the inner bone welding device 4 replace manual welding, and the transfer mechanism 5 connects the three devices in series to achieve synchronous welding. This not only realizes the automation process of the welding production line, but also improves the consistency of the welded products and the yield. At the same time, the synchronous welding achieved by the transfer mechanism 5 can also improve the welding efficiency, reduce labor costs, and avoid the occurrence of production accidents.

[0024] In this embodiment, a lifting cylinder 54 is provided at the bottom of the lifting frame 51 for driving the lifting frame 51 to rise and fall. The lifting frame 51 is also provided with a horizontal driving mechanism 55 for driving the transfer frame 52 to move horizontally. The horizontal driving mechanism 55 includes a driving motor 551 arranged on the lifting frame 51, a screw rod 552 connected to the driving motor 551 and a slider 553 sleeved on the screw rod 552. The slider 553 is threadedly matched with the screw rod 552. The slider 553 is fixedly connected to the transfer frame 52. When the driving motor 551 rotates, the slider 553 is driven to move horizontally through the screw rod 552, and the slider 553 drives the transfer frame 52 to move. The transfer frame 52 is driven to move by transmitting power through the screw rod 552, which can improve stability.

[0025] In this embodiment, the sleeve welding device 3 includes a first workbench 31 rotatably mounted on a frame for placing a chair foot body, a sleeve feeding mechanism 32 connected to one side of the first workbench 31, and a sleeve clamping mechanism 33 mounted above the first workbench 31. The sleeve feeding mechanism 32 arranges the sleeves in sequence through a vibration plate 34, and then clamps the sleeves through a manipulator 35 and sends them to the center of the chair foot body placed on the first workbench 31. Preferably, the manipulator 35 can extend into the inner ring of the sleeve through pneumatic fingers, clamp the sleeve by spreading the pneumatic fingers, and then drive the pneumatic fingers to move through a telescopic gas rod. After the sleeve clamping mechanism clamps and positions the sleeve, the welding robot welds the connection position. While welding, the first workbench 31 rotates, so that the welding robot maintains one welding action to completely weld the sleeve to the chair foot body, and completes one circle of welding by active rotation, rather than welding around the sleeve by the welding robot. This can reduce the degree of freedom of the welding robot, thereby reducing costs.

[0026] In this embodiment, the internal bone welding device 4 includes a second workbench 41 rotatably mounted on a frame for placing a chair foot body, an internal bone loading mechanism 42 connected to one side of the second workbench 41, and an internal bone pressing mechanism 43 mounted above the second workbench 41. The internal bone loading mechanism 42 clamps the internal bone and places it on the supporting feet of the chair foot body. Subsequently, the second workbench 41 rotates a certain angle to align the supporting feet without the internal bone with the internal bone loading mechanism 42, and the internal bone loading mechanism 42 repeats the loading action until all supporting feet of the chair foot body have internal bones. After placement, the internal bone pressing mechanism 43 presses all the internal bones on the chair foot body for welding. It can be determined that the rotation angle of the second workbench 41 is determined according to the number of supporting feet of the chair foot body. The specific formula is: the rotation angle is equal to 360° divided by the number of supporting feet. The chair foot body in this embodiment has five supporting feet, so the second workbench 41 rotates by 72° each time.

[0027] Furthermore, the internal bone loading mechanism 42 includes a material collection mechanism 421 for placing internal bones and a robotic arm 422 for clamping and feeding. The material collection mechanism 421 includes a material collection box 423 with an inclined surface and a lifting block 424 arranged at the bottom point of the inclined surface. A plurality of internal bones facing the same direction are arranged in the inclined surface of the material collection box 423. When the internal bones slide to the low point of the inclined surface, the lifting block 424 is driven to lift by the telescopic cylinder, thereby lifting the internal bones to the top of the material collection box 423, which makes it more convenient for the robotic arm 422 to clamp.

[0028] 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. An automated welding production line for chair legs, characterized in that: It comprises a frame (1) and a transfer mechanism (5) installed on the frame (1), and also comprises a loading device (2), a sleeve welding device (3) and an inner frame welding device (4) which are installed on the frame (1) in sequence and at intervals; the installation distance between two adjacent groups of devices is L; the transfer mechanism (5) comprises a lifting frame (51) for driving the chair foot body to move up and down, a transfer frame (52) for driving the chair foot body to move horizontally, and a supporting frame (53) for supporting the chair foot body, the transfer frame (52) is horizontally slidably installed on the top of the lifting frame (51), and the supporting frame (53) is provided with three groups, and the three groups of the supporting frames (53) are installed at the positions of the three groups of devices respectively, and the installation positions of the three groups of the supporting frames (53) correspond to the front end, middle part and rear end of the transfer frame (52); The loading device (2) turns over the unwelded chair foot body and places it on the front support frame (53) with the bottom facing upwards; the lifting frame (51) lifts the chair foot body via the support frame (53); the support frame (53) moves a distance L to the end away from the loading device (2) to move the chair foot body with the sleeve welded in the middle to the inner frame welding device (4); and the chair foot body with the sleeve and inner frame welded at the rear end is moved to the unloading area for unloading.

2. The automatic welding production line for chair legs according to claim 1, characterized in that: The transfer mechanism (5) is provided with two groups, and the two groups of transfer mechanisms (5) are respectively arranged in parallel and symmetrically on both sides of the loading device (2), the shaft sleeve welding device (3) and the internal bone welding device (4).

3. The automatic welding production line for chair legs according to claim 1 is characterized in that: A lifting cylinder (54) for driving the lifting frame (51) to move up and down is provided at the bottom of the lifting frame (51). A horizontal driving mechanism (55) for driving the transfer frame (52) to move horizontally is also provided on the lifting frame (51). The horizontal driving mechanism (55) comprises a driving motor (551) arranged on the lifting frame (51), a screw rod (552) connected to the driving motor (551), and a slider (553) sleeved on the screw rod (552). The slider (553) is threadedly matched with the screw rod (552). The slider (553) is fixedly connected to the transfer frame (52). When the driving motor (551) rotates, the slider (553) is driven to move horizontally through the screw rod (552), and the slider (553) drives the transfer frame (52) to move.

4. The automatic welding production line for chair legs according to claim 1, characterized in that: The shaft sleeve welding device (3) comprises a first workbench (31) rotatably mounted on a frame for placing a chair foot body, a shaft sleeve feeding mechanism (32) mounted on one side of the first workbench (31), and a shaft sleeve pressing mechanism (33) mounted above the first workbench (31), wherein the shaft sleeve feeding mechanism (32) clamps the shaft sleeve and delivers it to the center of the chair foot body on the first workbench (31), and the shaft sleeve pressing mechanism presses the shaft sleeve into position and then welds the connection position through a welding robot, while the first workbench (31) rotates while welding.

5. The automatic welding production line for chair legs according to claim 1, characterized in that: The internal bone welding device (4) comprises a second workbench (41) rotatably mounted on a frame for placing a chair foot body, an internal bone loading mechanism (42) mounted on one side of the second workbench (41), and an internal bone pressing mechanism (43) mounted above the second workbench (41). The internal bone loading mechanism (42) places the internal bone on the supporting feet of the chair foot body, then rotates the second workbench (41) to align the lowered supporting feet with the internal bone loading mechanism (42), and the internal bone loading mechanism (42) repeats the loading action until all the supporting feet of the chair foot body are placed. After placement, the internal bone pressing mechanism (43) presses all the internal bones on the chair foot body for welding.

6. The automatic welding production line for chair legs according to claim 5, characterized in that: The rotation angle of the second workbench (41) is equal to 360° divided by the number of supporting legs.

7. The automatic welding production line for chair legs according to claim 5, characterized in that: The internal bone loading mechanism (42) comprises a material-forming mechanism (421) for placing the internal bones and a mechanical arm (422) for clamping the internal bones and feeding them. The material-forming mechanism (421) comprises a material-forming box (423) with an inclined surface and a lifting block (424) arranged at the bottom point of the inclined surface. A plurality of internal bones facing the same direction are arranged in the inclined surface of the material-forming box (423). When the internal bones slide to the bottom point of the inclined surface, the lifting block (424) is driven by a telescopic cylinder to lift the internal bones to the top of the material-forming box (423).

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