Bed frame automatic welding system

Abstract

This invention discloses an automatic welding system for bed frames, relating to the field of bed frame processing. The system includes a drive frame and a rotating frame. The output end of the drive frame is fixedly connected to the middle of the rotating frame. A limiting fixture is provided on the outer side of the rotating frame. A locking mechanism is used to detachably and fixedly connect the rotating frame and the limiting fixture. Multiple limiting mechanisms are provided on the top of the limiting fixture to prevent the bed frame members from shifting or loosening when the limiting fixture rotates with the rotating frame. This automatic welding system achieves a stable connection between the rotating frame and the limiting fixture through the locking mechanism, eliminating the need for manual intervention and significantly reducing the harm of welding fumes and arc light to the human body. The limiting mechanism and welding fixture are controlled collaboratively by a control system. Angle blocks combined with locking components allow for flexible adjustment of the positioning position, adapting to the processing of multiple bed frame specifications and exhibiting strong versatility. The clamping process is simplified, the production cycle is shortened, and efficient and standardized bed frame welding is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bed frames, in particular to an automatic welding system for bed frames. BACKGROUND

[0002] As a core load-bearing component in the fields of furniture and medical equipment, the welding quality of a bed frame directly determines the stability and service life of the product. The market demand for batch production efficiency and welding precision of bed frames is increasing. At present, bed frame welding still generally relies on manual welding or semi-automatic welding mode, which has many technical bottlenecks. Manual welding is greatly influenced by the experience of the operator, and defects such as pores and slag inclusion are prone to occur in the weld, which has poor consistency, high scrap rate, high labor intensity, poor working environment, and harmfulness of welding fume and arc light to the health of the operator.

[0003] To address the aforementioned issues, reference can be made to the bed frame welding device and method disclosed in an existing patent (Chinese patent application number CN202210482747.X, application date May 5, 2022). This welding device involves symmetrically distributing several main welding frames on the left and right sides of the bed frame. During welding, the middle sections of both sides of the bed frame assembly are welded first, and then the welding proceeds outwards from the middle welding points until all welding points are completed. Once all welding points on both sides of the bed frame assembly are completed, the control system continues to control the bed frame assembly. The auxiliary welding frames on both the front and rear sides further fix the position of the middle part of the front and rear edges of the bed frame assembly. This structural welding method achieves fully automated welding of all weld points on the bed frame assembly, and allows for simultaneous and continuous welding of multiple weld points. The weld points exhibit good uniformity in appearance, high welding quality and efficiency, and have significant market potential. Furthermore, a welding device for an electric folding bed frame can be disclosed in an existing patent (Chinese patent application number CN202321437046.0, application date June 7, 2023). This device, by incorporating an air supply pipe, fastening sleeve, connecting pipe, and nozzle, can... This design allows the gas supply pipe to be fixed to both sides of the machine base via fastening sleeves. After the bed frame is welded, the connecting pipe is connected to the external gas supply equipment. Cooling gas enters the gas supply pipe through the connecting pipe and is sprayed out from the nozzle to cool the bed frame. This solves the problem in the prior art where the bed frame still retains the high temperature generated during welding, making it difficult for workers to move due to the extremely high temperature. Finally, please refer to the existing patent (Chinese patent application number CN202021627619.2, application date August 7, 2020). The disclosed automatic welding device for bed frames utilizes a welding robot in conjunction with a reversible welding machine frame to automate the welding process. The welding machine frame consists of an outer frame and connecting rods, with multiple mounting holes on the outer frame allowing for various mounting combinations of the connecting rods and the outer frame. The mounting position of the connecting rods can be adjusted according to the actual size of the bed frame. When placing the workpiece, it is positioned by a positioning component and locked by a quick-locking device. The equipment is easy to use and highly versatile. This invention is rationally designed and suitable for large-scale promotion.

[0004] Although the above-mentioned device has certain shortcomings in use, when welding the bed frame, it is necessary to adjust the angle of the bed frame. However, after the angle is rotated, the bed frame after tooling may fall off and become loose later, which is not conducive to the subsequent welding work.

[0005] Therefore, we proposed an automated bed frame welding system to address the problems mentioned above. Summary of the Invention

[0006] The purpose of this invention is to provide an automatic bed frame welding system to solve the problem mentioned in the background art that when welding bed frames on the market, the angle of the bed frame needs to be adjusted, but after the angle is rotated, the bed frame after tooling will fall off and loosen later, which is not conducive to the subsequent welding work.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an automatic bed frame welding system, comprising a drive frame and a rotating frame, wherein the output end of the drive frame is fixedly connected to the middle of the rotating frame, a limiting fixture is provided on the outer side of the rotating frame, a welding fixture is provided on one side of the limiting fixture, a connecting member is provided at the output end of the drive frame, and the end of the connecting member away from the drive frame is fixedly connected to the side wall of the rotating frame; a locking mechanism is provided on the side wall of the rotating frame, the locking mechanism being used to detachably and fixedly connect the rotating frame and the limiting fixture; multiple sets of limiting mechanisms are provided on the top of the limiting fixture, the limiting mechanisms pressing and positioning from the outside of the bed frame members, so that the bed frame members do not shift or loosen when the limiting fixture rotates with the rotating frame.

[0008] Preferably, the connecting member is a protruding rod, one end of which is fixedly connected to the output end of the drive frame, and the other end of which is fixedly connected to the side wall of the rotating frame by bolts.

[0009] Preferably, the bottom of the welding fixture is rotatably mounted on the top of the drive base, and a transmission component is connected to one side of the drive base. The transmission component drives the drive base to reciprocate along the sides of the two sets of rotating frames. The transmission component includes a servo motor and a transmission screw, and the transmission screw is in transmission engagement with the bottom of the drive base.

[0010] Preferably, the welding fixture is electrically connected to the control system, and the control system is also electrically connected to the limiting mechanism for coordinated control of welding and positioning actions.

[0011] Preferably, the locking mechanism includes a positioning bolt, the outer side of the limiting fixture is rotatably connected to the positioning bolt, the bottom of the positioning bolt is threadedly connected to a positioning hole, and the positioning hole is equally spaced through and opened at the top of the limiting fixture.

[0012] Preferably, the limiting mechanism includes a push-tightening cylinder fixedly installed on the top of the limiting fixture. The piston rod of the push-tightening cylinder abuts against the outer wall of the bed frame member. The other side of the bed frame member is attached to the side of the corner block. A corner cylinder is provided on the top outer side of the bed frame member. The piston rod of the corner cylinder presses the bed frame member from the top.

[0013] Preferably, the push-tightening cylinder and the corner cylinder are respectively connected to air pipes, and the two air pipes pass through the first through hole and the second through hole on the surface of the limiting fixture and are connected to the control system.

[0014] Preferably, a sliding groove is provided on the side of the angular block that fits with the limiting fixture, and a locking component is installed in the sliding groove; the locking component includes a locking bolt, the bottom of the locking bolt is threadedly connected to the limiting fixture, a locking washer is fixed in the middle of the locking bolt, and the bottom surface of the locking washer is pressed against the top surface of the limiting fixture.

[0015] Preferably, multiple sets of the angular blocks are evenly arranged on the top of the limiting fixture along the arrangement direction of the bed frame members.

[0016] The method of using an automatic bed frame welding system, specifically the method of using an automatic bed frame welding system, is characterized by the following: S1: Place the bed frame rod on the limiting fixture, so that one side of the rod fits against the corner block, and fix the corner block on the limiting fixture by the locking device; S2: Activate the limit mechanism, push the cylinder to tighten the bed frame rods from the side, and press the bed frame rods from the top with the corner cylinder to complete the positioning and locking of the rods; S3: The limiting fixture is fixedly connected to the rotating frame by a locking mechanism; S4: The drive frame rotates the rotating frame and the limit fixture to the welding angle, keeping the bed frame members from shifting or loosening; S5: The drive base moves the welding fixture to the welding position for automatic welding of the bed frame members; S6: After welding is completed, release the limiting mechanism and locking mechanism, and remove the welded bed frame.

[0017] Compared with existing technologies, the beneficial effects of this invention are as follows: This automatic welding system for bed frames achieves a stable connection through the locking mechanism of the rotating frame and the limiting fixture. Multiple sets of limiting mechanisms provide multi-directional clamping and positioning of the bed frame members, structurally preventing member displacement during fixture rotation and ensuring stable welding posture throughout the process. The drive frame can precisely rotate the workpiece, enabling automatic welding at all angles without manual intervention, significantly reducing the harm of welding fumes and arc light to the human body. The limiting mechanism and welding fixture are coordinated and controlled by the control system, ensuring precise action connection, uniform welds free of porosity and slag inclusions, and significantly improving welding quality and product consistency. The corner blocks, combined with locking components, allow for flexible adjustment of the positioning position, adapting to the processing of multiple bed frame specifications, and offering strong versatility. The clamping process is simplified, production cycle time is shortened, and bed frame welding becomes highly efficient and standardized. Specific details are as follows: 1. Employing a bidirectional clamping structure using both push-type and corner-type cylinders, coupled with corner block positioning references, the bed frame members are double-locked laterally and from the top, ensuring gapless and secure clamping and completely resolving the issues of member offset and detachment during rotation. The locking mechanism, through the engagement of positioning bolts and equally spaced positioning holes, enables rapid locking between the rotating frame and the limiting fixture, resulting in high connection strength, no relative displacement during rotation, and consistently accurate welding references. This positioning and locking structure requires no complex adjustments, is easy to assemble and disassemble, improves workpiece positioning accuracy, ensures continuous equipment operation stability, and allows for precise alignment of the bed frame members during welding, effectively enhancing the overall structural strength and service life of the bed frame. Simultaneously, it reduces manual correction processes, lowers operational difficulty, adapts to high-intensity continuous production, and significantly improves the reliability of welding operations.

[0018] 2. The servo motor and transmission screw drive the welding fixture to move smoothly. Combined with the fixture's rotation function, it covers all weld seams of the bed frame, eliminating welding dead angles. The angle blocks are position-adjustable via sliding grooves and locking mechanisms, allowing for adaptation to bed frames of different sizes and structures without tooling changes, making the equipment highly versatile. Automated control eliminates human error, ensuring uniform welding parameters and stable, controllable weld quality. It also shortens the welding cycle of a single bed frame, improving production efficiency. The entire system reduces labor and equipment investment for enterprises, improves the working environment, and possesses excellent practical value and market potential. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the rotating state structure of the present invention; Figure 3 This is a top view of the limiting tooling and rotating frame of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram of the rotating frame and the limiting fixture in the separated state of the present invention; Figure 6 This is a top view of the limiting tooling structure of the present invention; Figure 7 This is a schematic diagram of the main structure of the locking component of the present invention; Figure 8 This is a schematic diagram of the main structure of the rotating frame of the present invention.

[0020] In the diagram: 1. Drive frame; 2. Rotating frame; 201. Protruding rod; 3. Limiting fixture; 4. Drive base; 5. Welding fixture; 6. Positioning bolt; 7. Pushing cylinder; 8. Corner cylinder; 9. First through hole; 10. Second through hole; 11. Positioning hole; 12. Angle block; 1201. Slide groove; 13. Locking component; 1301. Locking bolt; 1302. Locking washer. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-8 The present invention provides the following technical solution: an automatic welding system for bed frames.

[0023] The system comprises a drive frame 1, a rotating frame 2, a limiting fixture 3, a drive base 4, a welding fixture 5, a locking mechanism, a limiting mechanism, and a control system. The drive frame 1 provides rotational power for the entire system and employs a servo-driven rotary drive mechanism, enabling precise positioning and self-locking at any angle within a wide range, preventing backlash or wobbling after rotation. The rotating frame 2 is a rigid frame structure, with its middle end fixedly connected to the output end of the drive frame 1, and symmetrically arranged on both sides. It supports the limiting fixture 3 and drives its synchronous rotation. The limiting fixture 3 serves as the support and positioning carrier for the bed frame members, and is connected to the rotating frame 2 via a locking mechanism. The system features a detachable rigid fixation mechanism to ensure no relative displacement during rotation. Multiple limiting mechanisms are arranged on the top of the limiting fixture 3 to provide multi-directional, high-strength clamping to the bed frame members, preventing displacement or loosening during rotation. The welding fixture 5 is mounted on the drive base 4, enabling horizontal movement and rotation. Combined with the angle adjustment of the rotating frame 2, it facilitates automatic welding of all positions of the bed frame welds. The control system, the core of the entire system, uses a PLC programmable logic controller, electrically connected to the drive frame 1, welding fixture 5, limiting mechanisms, and transmission components to achieve coordinated actions and automated processes.

[0024] A docking component is fixedly installed at the output end of the drive frame 1. In this embodiment, the docking component is a rigid protruding rod 201. The protruding rod 201 is made of high-strength alloy steel, and its torsional and bending resistance meets the requirements of heavy-load rotation. The end of the protruding rod 201 closest to the drive frame 1 is rigidly fixed to the output end of the drive frame 1 through a flange surface to ensure that the power transmission is seamless. A bolt hole is opened in the middle of the end of the protruding rod 201 away from the drive frame 1, and it is fixedly connected to the side wall of the rotating frame 2 by a high-strength fastening bolt. Anti-slip pads are provided on the connection surface to prevent the bolts from loosening after long-term use. This structure can stably transmit the rotational torque of the drive frame 1 to the rotating frame 2 and avoid transmission failure.

[0025] The locking mechanism is used to rigidly fix the rotating frame 2 and the limiting fixture 3. It includes a positioning bolt 6 and a positioning hole 11. The positioning bolt 6 is a cylindrical pin with external threads and a rotating handle on the top for easy and quick manual operation. The outer wall of the limiting fixture 3 rotates with the inner side of the positioning bolt 6. The bottom of the positioning bolt 6 is provided with external threads. The positioning hole 11 is a through hole with internal threads, which is opened at equal intervals through the top edge of the limiting fixture 3. The thread specification of the positioning hole 11 is completely matched with that of the positioning bolt 6. During installation, the limiting fixture 3 is placed against the preset installation position of the rotating frame 2, and the positioning bolt 6 is rotated so that its bottom is screwed into the corresponding positioning hole 11 until the end face of the positioning bolt 6 presses against the surface of the limiting fixture 3, thereby achieving a gapless fixation between the rotating frame 2 and the limiting fixture 3. The equally spaced positioning holes 11 can adapt to the installation requirements of different specifications of the limiting fixture 3, improving the versatility of the equipment.

[0026] The limiting mechanism is the core structure to prevent the bed frame members from shifting or loosening. It includes a push-tightening cylinder 7, a corner cylinder 8, an angle block 12, and a locking component 13. The push-tightening cylinder 7 is fixedly installed on the top of the limiting fixture 3 by bolts, with the piston rod facing the bed frame member. It is used to press the outer wall of the member from the horizontal side. The corner cylinder 8 is also fixed on the top of the limiting fixture 3, located above the bed frame member. The piston rod can rotate and press down, pressing the top of the member from the vertical direction. It forms a bidirectional pressing with the push-tightening cylinder 7 to prevent the member from moving up and down or left and right. The side of the bed frame member away from the push-tightening cylinder 7 is attached to the side of the angle block 12. The angle block 12 is an L-shaped rigid positioning block, which serves as the positioning reference for the member and ensures that the member is placed in a uniform position.

[0027] An elongated groove 1201 is formed on the side of the angle block 12 that mates with the limiting fixture 3. A locking element 13 is installed in the groove 1201. The locking element 13 includes a locking bolt 1301 and a locking washer 1302. The bottom of the locking bolt 1301 is provided with an external thread, which is threaded to the threaded hole at the top of the limiting fixture 3. The locking washer 1302 is fixed in the middle of the locking bolt 1301, and its outer diameter is larger than the width of the groove 1201. When adjusting the position of the angle block 12, the locking is released. Bolt 1301 and corner block 12 can move horizontally along slide groove 1201 to adapt to bed frame rods of different lengths and widths; after the position is determined, tighten bolt 1301, and the bottom surface of locking washer 1302 is tightly pressed against the top surface of limiting fixture 3 to completely fix corner block 12 and prevent positioning reference from shifting; multiple sets of corner blocks 12 are evenly arranged on the top of limiting fixture 3 along the arrangement direction of bed frame rods to achieve multi-point positioning of rods and further improve positioning stability; Both the push-tightening cylinder 7 and the corner cylinder 8 are connected to pneumatic pipelines. The surface of the limiting fixture 3 is provided with a first through hole 9 and a second through hole 10. The pneumatic pipelines pass through the first through hole 9 and the second through hole 10 respectively and are connected to the pneumatic unit of the control system. The control system controls the extension and retraction of the cylinders to ensure the synchronicity of pressing and releasing.

[0028] The bottom of the welding fixture 5 is rotatably mounted on the top of the drive base 4 via a rotary bearing, enabling it to rotate and adapt to welding seams at different angles. The bottom of the drive base 4 is connected to a transmission component, which includes a servo motor and a lead screw. The output end of the servo motor is rigidly connected to the lead screw, which is horizontally arranged along the sides of the two sets of rotating frames 2. A threaded sleeve is provided on the bottom of the drive base 4, which is threadedly engaged with the lead screw. When the servo motor starts, it drives the lead screw to rotate, thereby driving the drive base 4 to reciprocate along the lead screw axis, moving the welding fixture 5 to the designated welding position. The welding fixture 5 integrates a welding power source and a welding torch, which are electrically connected to the control system. It can automatically perform arc initiation, welding, and arc termination actions. Weld parameters can be preset to ensure stable welding quality.

[0029] The operating method of the automatic bed frame welding system is as follows: Loading and positioning: The operator places the bed frame rod to be welded stably on the top of the limiting fixture 3, adjusts the position of the angle block 12 according to the rod specifications, moves the angle block 12 along the slide groove 1201 to the rod fitting position, tightens the locking bolt 1301, and fixes the angle block 12 by the locking washer 1302 to form a stable positioning reference.

[0030] Rod clamping: The control system activates the limit mechanism, pushing the piston rod of cylinder 7 to extend and clamp the outer wall of the bed frame rod from the horizontal side; the piston rod of corner cylinder 8 rotates and presses down, clamping the top of the rod from the vertical direction, completing the bidirectional locking of the bed frame rod and ensuring that the rod has no movement gap.

[0031] Fixture locking: The operator rotates the positioning bolt 6 so that its bottom is screwed into the positioning hole 11 of the limiting fixture 3, which rigidly fixes the limiting fixture 3 and the rotating frame 2 into one piece, ensuring that there is no relative displacement during the rotation.

[0032] Angle adjustment: The control system controls the start of the drive frame 1. The drive frame 1 drives the rotating frame 2, the limit fixture 3 and the bed frame rods to rotate synchronously through the protrusion 201 until the preset welding angle is reached. The drive frame 1 then locks itself to maintain a stable posture.

[0033] Automatic welding: The servo motor of the transmission component is started, which drives the base 4 to move through the transmission screw, and moves the welding fixture 5 to the weld position; the welding fixture 5 rotates to adjust the angle of the welding gun, and the control system controls the welding gun to perform automatic welding and complete the weld processing.

[0034] Unloading: After welding is completed, welding fixture 5 is reset, drive frame 1 drives the workpiece to rotate back to the initial position; control system controls the limit mechanism to release, push cylinder 7 and corner cylinder 8 piston rods to retract; rotation positioning bolt 6 releases the lock between limit fixture 3 and rotating frame 2, and the operator removes the welded bed frame to complete a single operation cycle.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic bed frame welding system, comprising a drive frame (1) and a rotating frame (2), wherein the output end of the drive frame (1) is fixedly connected to the middle of the rotating frame (2), a limiting fixture (3) is provided on the outer side of the rotating frame (2), and a welding fixture (5) is provided on one side of the limiting fixture (3), characterized in that: The output end of the drive frame (1) is provided with a docking part, and the end of the docking part away from the drive frame (1) is fixedly connected to the side wall of the rotating frame (2); the side wall of the rotating frame (2) is provided with a locking mechanism, which is used to detachably and fixedly connect the rotating frame (2) with the limiting fixture (3); the top of the limiting fixture (3) is provided with multiple sets of limiting mechanisms, which press and position the bed frame rods from the outside, so that the bed frame rods do not shift or loosen when the limiting fixture (3) rotates with the rotating frame (2).

2. The automatic bed frame welding system according to claim 1, characterized in that: The docking component is a protruding rod (201). One end of the protruding rod (201) is fixedly connected to the output end of the drive frame (1), and the other end of the protruding rod (201) is fixedly connected to the side wall of the rotating frame (2) by bolts.

3. The automatic bed frame welding system according to claim 1, characterized in that: The bottom of the welding fixture (5) is rotatably mounted on the top of the drive base (4). A transmission component is connected to one side of the drive base (4). The transmission component drives the drive base (4) to reciprocate along the sides of the two sets of rotating frames (2). The transmission component includes a servo motor and a transmission screw. The transmission screw is in transmission cooperation with the bottom of the drive base (4).

4. The automatic bed frame welding system according to claim 3, characterized in that: The welding fixture (5) is electrically connected to the control system, and the control system is also electrically connected to the limiting mechanism for coordinated control of welding and positioning actions.

5. The automatic bed frame welding system according to claim 1, characterized in that: The locking mechanism includes a positioning bolt (6), the outer side of the limiting fixture (3) is rotatably connected to the positioning bolt (6), the bottom of the positioning bolt (6) is threadedly connected to the positioning hole (11), and the positioning hole (11) is equally spaced through the top of the limiting fixture (3).

6. The automatic bed frame welding system according to claim 1, characterized in that: The limiting mechanism includes a push-tightening cylinder (7) fixedly installed on the top of the limiting fixture (3). The piston rod of the push-tightening cylinder (7) abuts against the outer wall of the bed frame member. The other side of the bed frame member is attached to the side of the corner block (12). A corner cylinder (8) is provided on the top outer side of the bed frame member. The piston rod of the corner cylinder (8) presses the bed frame member from the top.

7. The automatic bed frame welding system according to claim 6, characterized in that: The push cylinder (7) and the corner cylinder (8) are respectively connected to air pipes. The two air pipes pass through the first through hole (9) and the second through hole (10) on the surface of the limiting fixture (3) and are connected to the control system.

8. The automatic bed frame welding system according to claim 6, characterized in that: The corner block (12) has a sliding groove (1201) on one side that fits with the limiting fixture (3), and a locking component (13) is installed in the sliding groove (1201); the locking component (13) includes a locking bolt (1301), the bottom of the locking bolt (1301) is threadedly connected to the limiting fixture (3), and a locking washer (1302) is fixed in the middle of the locking bolt (1301), and the bottom surface of the locking washer (1302) is pressed against the top surface of the limiting fixture (3).

9. The automatic bed frame welding system according to claim 8, characterized in that: Multiple sets of the angular blocks (12) are evenly arranged on the top of the limiting fixture (3) along the arrangement direction of the bed frame members.

10. A method of using an automatic bed frame welding system, applicable to the method of using an automatic bed frame welding system according to any one of claims 1-9, characterized in that: The specific operation method is as follows: S1: Place the bed frame rod on the limiting fixture (3) so that one side of the rod fits against the corner block (12), and fix the corner block (12) on the limiting fixture (3) by the locking part (13); S2: Start the limit mechanism, push the cylinder (7) to tighten the bed frame rod from the side, and the corner cylinder (8) presses the bed frame rod from the top to complete the rod positioning and locking; S3: The limiting fixture (3) is fixedly connected to the rotating frame (2) by the locking mechanism; S4: The drive frame (1) drives the rotating frame (2) and the limiting fixture (3) to rotate to the welding angle, keeping the bed frame rods from shifting or loosening; S5: The drive base (4) drives the welding fixture (5) to move to the welding position and automatically welds the bed frame rods; S6: After welding is completed, release the limiting mechanism and locking mechanism, and remove the welded bed frame.

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