Welding equipment for sliding door production

Abstract

The invention relates to the technical field of sliding door assembly, in particular to welding equipment for sliding door production, which comprises a welding frame, a six-axis mechanical arm, a welding gun fixedly mounted on the six-axis mechanical arm, an aligning mechanism for aligning a door frame, and a positioning mechanism for auxiliary positioning, according to the welding equipment for sliding door production, by arranging the aligning mechanism, space positioning and aligning operation on the four edges of a door frame can be achieved, so that the preparation time before welding is remarkably shortened, and the operation complexity is remarkably reduced. And meanwhile, when alignment and positioning of the door frame are completed, rigid constraint is carried out on all edges, the shaking phenomenon caused by thermal stress, mechanical vibration and other factors in the welding process is effectively restrained, then the stability of the welding process and the welding seam forming quality are guaranteed, and the comprehensive efficiency of welding operation is comprehensively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sliding door assembly, and particularly relates to a welding device for sliding door production. Background Art

[0002] A sliding door is a type of door that opens and closes by horizontal sliding. Its door leaf moves left and right or up and down along a fixed track, without occupying the space in the opening and closing direction of the door leaf. It has the characteristics of saving space, convenient operation, and flexible design, and is widely used in residential, commercial, and industrial buildings.

[0003] Among them, when welding the sliding door frame, as a key component for structural load-bearing and sealing, the welding quality of the sliding door frame directly affects the durability, sealing performance, and safety of the product. Currently, the door frame welding technology faces the dual challenges of material diversity (such as aluminum alloy, stainless steel, carbon steel, etc.) and special-shaped structures (such as corner splicing, multi-segment combination), and needs to balance strength, precision, and corrosion resistance.

[0004] Patent Application No. CN202410778442.2 provides a decorative door frame welding device, which relates to the technical field of door frame welding, including: the driving wheel is used for rotating forward and backward to drive the four T-shaped sliding rods to slide in and out to tighten and loosen the door frame; a driving ring is welded on the top part of the right vertical support rod, a notch is opened on the driving ring, and both the head and tail ends near the notch on the driving ring are in an inclined cutting structure. When the door frame combination rack is in a horizontal upward state, the head end of the longitudinal driving rod is located in the notch; when the door frame combination rack is flipped to weld the door frame on the reverse side, the longitudinal driving rod rotates along the driving ring and abuts against the inclined cutting part of the head end or the tail end of the driving ring. Through the power transmission of the longitudinal driving rod and the driving ring, the four L-shaped blocking rods can use the flipping power of the door frame combination rack to drive the sliding in and out to tighten and loosen, saving the trouble of manually operating the four L-shaped blocking rods to tighten and loosen the door frame additionally before and after each flipping of the door frame combination rack, which helps to simplify the operation steps of the device.

[0005] Although this patent realizes the rapid clamping of the four beams of the door frame through a mechanical fixing device, it still relies on manual operation to complete the high-precision alignment and positioning of the beam on the welding rack, resulting in a significant increase in the time-consuming of the welding preparation process and being difficult to meet the beat efficiency requirements in large-scale production. In addition, during the clamping process, the contact points between the blocking rods and the beam are prone to micro-displacements due to uneven stress distribution or positioning deviation, resulting in the alignment error of the welding joints of adjacent beams exceeding the tolerance range (such as the gap > 0.2mm or the misalignment > 0.1mm), thereby causing welding seam forming defects (such as lack of fusion, undercut) or weakening of the structural strength, ultimately affecting the overall mechanical properties and sealing reliability of the door frame.

[0006] Therefore, it is necessary to provide a new technical solution to overcome the above defects. Summary of the Invention

[0007] The object of the present invention is to provide a welding device for the production of sliding doors that can effectively solve the above technical problems.

[0008] To achieve the object of the present invention, the following technical solutions are adopted: A welding device for the production of sliding doors, comprising: a welding frame, a six-axis robotic arm, a welding torch fixedly installed on the six-axis robotic arm, an alignment mechanism for aligning door frames, and a positioning mechanism for auxiliary positioning; The alignment mechanism includes: a placement plate slidably installed on the welding frame, a hinged rod hinged to the placement plate, a driving rod hinged to the other end of the hinged rod, a driving motor for driving the driving rod to rotate, and a fixing component for fixing the door frame; the driving rod is fixedly connected to the output shaft of the motor.

[0009] Further, four groups of alignment mechanisms are provided on the mounting frame to separately fix each side of the door frame; the placement plate is an L-shaped placement plate.

[0010] Further, the fixing component includes: a limiting plate fixedly installed on the welding frame, a limiting hole opened on the limiting plate, a limiting rod slidably installed in the limiting hole, a butting plate fixedly connected to the limiting rod, and an elastic member elastically connecting the limiting plate and the butting plate; the butting plate is located on the travel of the placement plate.

[0011] Further, the positioning mechanism includes: a corner limiting member slidably installed on the welding frame, a cylinder for driving the corner limiting member to approach the aligned door frame, and an inner support block fixedly installed on the welding frame; the cylinder is fixedly installed on the welding frame; the telescopic rod of the cylinder is fixedly connected to the corner limiting member; the inner support block is located on the travel of the corner limiting block.

[0012] Further, a limiting groove is opened inside the corner limiting member; the limiting groove matches the angle of the corner of the aligned door frame.

[0013] Further, a welding groove is also opened on the corner limiting member.

[0014] Further, a bladder is sleeved outside the inner support block, and an extraction assembly for filling hot water into the bladder; The extraction assembly includes: an extraction chamber, a piston slidably installed in the extraction chamber, a liquid outlet opened on the extraction chamber, and the piston is fixedly connected to the corner limiting member; the liquid outlet is communicated with the water inlet of the bladder through a pipe fitting.

[0015] Further, a heater is fixedly installed around the outside of the extraction chamber.

[0016] Compared with the prior art, the present invention has the following beneficial effects: By setting an alignment mechanism, the welding equipment for producing sliding doors of the present invention can achieve spatial positioning and alignment operations on the four sides of the door frame, thus significantly reducing the pre-welding preparation time and operation complexity. At the same time, while completing the alignment and positioning of the door frame, rigid constraints are imposed on each side, effectively suppressing the jitter phenomenon caused by factors such as thermal stress and mechanical vibration during the welding process, thereby ensuring the stability of the welding process and the quality of the weld formation, and comprehensively improving the comprehensive efficiency of the welding operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention.

[0018] Figure 1 is a schematic structural diagram of a welding equipment for producing sliding doors of the present invention; Figure 2 is a schematic structural diagram of the door frame in the present invention; Figure 3 is a schematic structural diagram of the alignment mechanism in the present invention; Figure 4 is Figure 3 a schematic structural diagram of part A in Figure 5 is a front view of the alignment structure in the present invention; Figure 6 is a schematic structural diagram of the positioning mechanism in the present invention; Figure 7 is a schematic structural diagram of the extraction component in the present invention; Figure 8 is a cross-sectional view of the extraction component in the present invention; Figure 9 is a schematic structural diagram of the corner limiting member in the present invention.

[0019] In the figure: 1, welding frame; 2, six-axis robotic arm; 3, welding torch; 4, alignment mechanism; 5, positioning mechanism; 6, door frame; 41, placement plate; 42, hinge rod; 43, driving rod; 44, driving motor; 45, fixing component; 451, limiting plate; 452, limiting hole; 453, limiting rod; 454, abutting plate; 455, elastic member; 51, corner limiting member; 52, cylinder; 53, inner support block; 511, limiting groove; 512, welding groove; 54, bladder; 55, extraction component; 551, extraction chamber; 552, piston; 553, liquid outlet; 554, pipe fitting. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "transverse", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the protection scope of the present invention. When a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0022] As Figures 1 to 9 shown, a welding device for the production of a sliding door of the present invention includes: a welding frame 1, a six-axis robotic arm 2, a welding torch 3 fixedly installed on the six-axis robotic arm 2, an alignment mechanism 4 for aligning the door frame 6, and a positioning mechanism 5 for auxiliary positioning. The alignment mechanism 4 includes: a placement plate 41 slidably installed on the welding frame 1, a hinge rod 42 hinged to the placement plate 41, a driving rod 43 hinged to the other end of the hinge rod 42, a driving motor 44 for driving the driving rod 43 to rotate, and a fixing component 45 for fixing the door frame 6; the driving rod 43 is fixedly connected to the output shaft of the motor. Four groups of alignment mechanisms 4 are provided on the mounting frame to separately fix each side of the door frame 6; the placement plate 41 is an L-shaped placement plate 41.

[0023] When performing welding operations on the sliding door frame 6, the operator manually positions the cross beam and longitudinal beam that have been pre-processed with a groove on the placement plate 41 of the welding frame 1. Subsequently, the driving motor 44 is started, and the motor drives the driving rod 43 to perform a rotational motion; the rotation of the driving rod 43 pulls the hinge rod 42 through a mechanical linkage mechanism to generate a translational motion, and the translation of the hinge rod 42 further drives the placement plate 41 to move towards the motor axis direction.

[0024] It should be specifically noted that a sliding seat structure is fixedly installed at the bottom of the placement plate 41, and a slide rail assembly is correspondingly arranged on the welding frame 1. When the driving motor 44 drives the placement plate 41 to move, the placement plate 41 realizes stable guiding movement along the laying direction of the slide rail by means of the cooperation between the sliding seat and the slide rail. In view of the fact that there are four groups of independent and collaborative alignment mechanisms 4 configured on the welding frame 1, during the process of the motor driving the placement plate 41 to move, the four placement plates 41 carrying the four sides of the bearing door frame 6 can synchronously move closer to each other, so as to realize the rapid and accurate feeding of the door frame 6, and automatically complete the alignment operation of the four sides of the door frame 6 after feeding. This design significantly shortens the preparation time before welding and effectively improves the overall efficiency of the welding operation.

[0025] The fixing component 45 includes: a limiting plate 451 fixedly installed on the welding frame 1, a limiting hole 452 opened on the limiting plate 451, a limiting rod 453 slidably installed in the limiting hole 452, a contact plate 454 fixedly connected to the limiting rod 453, and the limiting plate 451 and the contact plate 454 are elastically connected by an elastic member 455; the contact plate 454 is located on the travel path of the placement plate 41.

[0026] When the placement plate 41 moves inward along the preset path (the laying direction of the slide rail) under the action of the motor drive system, the side of the door frame 6 carried by it moves accordingly and gradually comes into contact with and closely abuts against the contact plate 454. Furthermore, through the cooperative action of the placement plate 41 and the contact plate 454, effective clamping and positioning of the side of the door frame 6 are realized; in view of the fact that the contact plate 454 is elastically connected to the limiting plate 451 through an elastic member 455 (such as a spring), after the placement plate 41 and the contact plate 454 are in contact, the contact plate 454 will synchronously move inward together under the drive of the placement plate 41. This dynamic cooperation process effectively ensures the stability of the alignment operation of the side of the door frame 6; at the same time, this elastic clamping can also significantly reduce the risk of the door frame 6 shaking due to external disturbances during the welding process, avoid the deviation of the weld seam, and thus ensure the reliability and consistency of the welding quality.

[0027] It should be emphasized that by setting the alignment mechanism 4, the spatial positioning and alignment operation of the four sides of the door frame 6 can be realized. Based on this design, in the manual feeding link, only the sides of the door frame 6 need to be roughly placed in the designated area of the placement plate 41, and there is no need to perform high-precision pre-alignment operations, thus significantly reducing the preparation time and operation complexity before welding. At the same time, while completing the alignment and positioning of the door frame 6, rigid constraints are imposed on each side, effectively suppressing the jitter phenomenon caused by factors such as thermal stress and mechanical vibration during the welding process, and then ensuring the stability of the welding process and the quality of the weld formation, and comprehensively improving the comprehensive efficiency of the welding operation.

[0028] By mechanically aligning the edges of the door frame 6, alignment errors of adjacent beam welding joints often exceed the tolerance range due to various problems, which in turn cause weld forming defects (such as lack of fusion and undercut) or weakening of structural strength, ultimately affecting the overall mechanical properties and sealing reliability of the door frame 6.

[0029] The positioning mechanism 5 includes: a corner limiting member 51 slidably mounted on the welding rack 1, a cylinder 52 driving the corner limiting member 51 to approach the aligned door frame 6, and an inner support block 53 fixedly mounted on the welding rack 1; the cylinder 52 is fixedly mounted on the welding rack 1; the telescopic rod of the cylinder 52 is fixedly connected to the corner limiting member 51; the inner support block 53 is located on the travel path of the corner limiting block.

[0030] A limiting groove 511 is formed inside the corner limiting member 51; the limiting groove 511 matches the angle of the corner of the aligned door frame 6; a welding groove 512 is also formed on the corner limiting member 51.

[0031] After the door frame 6 completes the spatial positioning and centering operations implemented by the alignment mechanism 4, the cylinder 52 is driven to move. The cylinder 52 drives the corner limiting member 51 to approach the corner area of the aligned door frame 6 along a predetermined movement path through the linear retraction movement of its piston 552 rod until the corner limiting block is tightly sleeved with the corner of the door frame 6; at this time, the preset limiting groove 511 inside the corner limiting member 51 performs secondary spatial correction on the docking edge of the door frame 6, and further eliminates potential alignment errors at the welding joints of adjacent beams through a physical constraint mechanism, ensuring that they are strictly controlled within the preset process tolerance range, thereby effectively preventing forming defects such as lack of fusion and undercut of the weld caused by alignment deviation.

[0032] During the welding implementation stage, the six-axis robotic arm 2 drives the welding torch 3 to perform high-precision trajectory tracking welding operations according to the welding groove 512 path pre-planned on the corner limiting member 51. The design of the welding groove 512 is highly coupled with the kinematic model of the robotic arm, ensuring that when the welding torch 3 moves along the welding groove 512 path, the weld quality meets the requirements. At the same time, the six-axis robotic arm 2 is integrated with a high-resolution CCD vision detection module. When the corner limiting member 51 completes the sleeving action with the corner of the door frame 6, this module uses image recognition algorithms to real-time monitor the exposure state of the adjacent beam connection seam in the welding groove 512. Under ideal alignment conditions, the connection seam should be completely exposed within the detection field of view of the welding groove 512; if the detection system determines that the connection seam is not normally exposed in the welding groove 512, it can be determined as an alignment deviation of the door frame 6 or a bevel processing error. The CCD vision detection module realizes real-time data interaction with the control system through a digital communication interface. When an abnormal state is detected, the system automatically triggers an alarm mechanism and prompts the operator for manual intervention, significantly improving the overall accuracy and reliability of the welding process through a closed-loop feedback mechanism.

[0033] During the welding and assembly process of the door frame 6, when the two adjacent sides of the door frame 6 are approaching and aligning in space, the inner support block 53 makes rigid contact support with the inner cavity of the door frame 6 through its structured support surface, forming a stable internal structure constraint; at the same time, the corner position-limiting member and the inner support block 53 jointly construct an "inner-outer" two-way collaborative composite positioning system. This system significantly improves the spatial positioning accuracy and attitude maintenance ability during the welding process by eliminating the dynamic deformation caused by welding thermal stress.

[0034] The positioning mechanism 5 is provided with four groups and is respectively arranged on the welding frame 1 at the four corners of the door frame 6. The door frame 6 can be better welded through the synchronous fixation of the four corners.

[0035] In the welding manufacturing process of the push door, in order to improve the corrosion resistance (anti-corrosion property) and long-term service reliability (durability) of the door frame 6, aluminum alloy is widely used in the structure manufacturing of the door frame 6 due to its light weight, high strength, excellent corrosion resistance and other characteristics. However, the unique physical metallurgical characteristics of aluminum alloy lead to significant technical challenges in its welding process: on the one hand, the high thermal conductivity (heat conductivity) of aluminum alloy promotes the rapid diffusion of welding heat input, and the cooling rate of the weld area increases significantly, which easily leads to the coarsening of the crystal structure of the weld metal and the concentration of residual stress.

[0036] A bladder 54 is sleeved outside the inner support block 53, and an extraction assembly 55 for filling hot water into the bladder 54 is provided; The extraction assembly 55 includes: an extraction chamber 551, a piston 552 slidably installed in the extraction chamber 551, a liquid outlet 553 opened on the extraction chamber 551, and a heater fixedly installed around the outside of the extraction chamber 551; the piston 552 is fixedly connected to the corner position-limiting member 51; the liquid outlet 553 is communicated with the water inlet of the bladder 54 through a pipe 554; During the process of the cylinder 52 actuator pushing the corner position-limiting member to perform a linear displacement movement, the piston 552 in the extraction chamber 551 is synchronously driven to reciprocate along the axial direction of the extraction chamber 551. Based on the principle of positive-displacement hydraulic transmission, the axial displacement of the piston 552 causes the internal volume of the extraction chamber 551 to change periodically, thereby forming a pressure gradient to drive the directional flow of the hydraulic medium (such as an incompressible fluid) in the chamber. This hydraulic medium is transported through the pipe 554 to the flexible bladder 54 structure built in the inner support block 53, causing it to undergo a controllable elastic expansion deformation to adapt to the complex geometric features inside the door frame 6. It should be noted that the inner side of the door frame 6 is usually designed with a special-shaped groove structure (such as Figure 2 shown) to adapt to the assembly requirements of components such as door panels or glass. After the bladder 54 expands and deforms, it can form a highly fitting contact with the special-shaped groove features on the inner wall of the door frame 6 through the adaptive surface fitting technology, significantly improving the rigidity and stability of the positioning and clamping system.

[0037] During the welding operation stage, the hydraulic medium (such as circulating water) filled inside the bladder 54 dynamically regulates the welding heat input through the heat capacity effect and the convective heat transfer mechanism. Specifically, the transient high temperature generated during the welding process is transferred to the surface of the bladder 54 through heat conduction. The liquid medium inside the bladder 54 delays the attenuation rate of the temperature field in the welding area through the phase change energy storage and heat buffer effects, thereby overcoming the problem of excessive welding heat loss caused by the high thermal conductivity of aluminum alloy materials. This welding temperature field control technology based on thermo-mechanical coupling regulation can significantly improve the thermal cycle characteristics of aluminum alloy welded joints, inhibit the generation of defects such as welding cold cracks and pores, optimize the microstructure of the weld metal, and enhance the mechanical properties and durability of the welded joints.

[0038] Since liquid aluminum has a very high solubility for hydrogen, hydrogen rapidly precipitates to form pores during solidification; As a further technical optimization solution of this patent, a high-precision resistive heater assembly is integrally installed on the side wall of the extraction chamber 551. The heater precisely regulates the temperature of the circulating water medium in the extraction chamber 551 through the heat conduction and convective heat transfer mechanisms. When the system starts the preheating program, the heater heats the water medium to the target temperature range (such as 60°C to 150°C, determined according to the specific welding process requirements) according to the preset process parameters. The piston 552 conveys the heated water medium to the flexible bladder 54 structure built in the inner support block 53 through a positive displacement pushing action. After the bladder 54 expands due to heat, its surface temperature acts on the aluminum alloy base material in the weld area of the door frame 6 through heat conduction, realizing pre-welding heat treatment. By aligning the preheating, the welding residual stress is reduced, the formation of hydrogen-induced pores is inhibited, the fluidity of the molten pool is improved to optimize the weld formation, and at the same time, the aging process in the heat-affected zone is slowed down and intergranular corrosion is prevented, thereby significantly improving the welding quality and structural reliability.

[0039] After the welding of the door frame 6 is completed, the cylinder 52 drives the angle limit to move in the reverse direction. At this time, the piston 552 moves in the reverse direction, and the water in the bladder 54 is pumped back into the extraction chamber 551 again. The volume of the bladder 54 decreases, reducing the contact with the door frame 6 after welding, which is convenient for the staff to take the material.

[0040] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art. Details are not described herein. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0041] It should be understood that those of ordinary skill in the art can make improvements or modifications based on the above description, and all such improvements and modifications shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A welding device for the production of sliding doors, characterized in that, Including: A welding frame, a six-axis robotic arm, a welding torch fixedly installed on the six-axis robotic arm, an alignment mechanism for aligning the door frame, and a positioning mechanism for auxiliary positioning; The alignment mechanism includes: a placement plate slidably installed on the welding frame, a hinge rod hinged to the placement plate, a driving rod hinged to the other end of the hinge rod, a driving motor for driving the driving rod to rotate, and a fixing component for fixing the door frame; the driving rod is fixedly connected to the output shaft of the motor.

2. The welding equipment for producing sliding doors according to claim 1, characterized in that, There are four groups of alignment mechanisms on the installation frame to separately fix each side of the door frame; the placement plate is an L-shaped placement plate.

3. The welding equipment for producing sliding doors according to claim 2, characterized in that, The fixing component includes: a limiting plate fixedly installed on the welding frame, a limiting hole opened on the limiting plate, a limiting rod slidably installed in the limiting hole, a butting plate fixedly connected to the limiting rod, and the limiting plate and the butting plate are elastically connected by an elastic member; the butting plate is located on the travel of the placement plate.

4. A welding device for the production of sliding doors according to claim 1, characterized in that, The positioning mechanism includes: a corner limiting member slidably installed on the welding frame, a cylinder for driving the corner limiting member to approach the aligned door frame, and an inner support block fixedly installed on the welding frame; the cylinder is fixedly installed on the welding frame; the telescopic rod of the cylinder is fixedly connected to the corner limiting member; the inner support block is located on the travel of the corner limiting block.

5. The welding equipment for producing sliding doors according to claim 4, characterized in that, A limiting groove is opened inside the corner limiting member; the limiting groove matches the angle of the corner of the aligned door frame.

6. The welding device for producing sliding doors according to claim 5, characterized in that, A welding groove is also opened on the corner limiting member.

7. The welding device for producing sliding doors according to claim 6, characterized in that, A bladder is sleeved outside the inner support block, and an extraction component for filling hot water into the bladder; The extraction component includes: an extraction chamber, a piston slidably installed in the extraction chamber, a liquid outlet opened on the extraction chamber, and the piston is fixedly connected to the corner limiting member; the liquid outlet is communicated with the water inlet of the bladder through a pipe fitting.

8. A welding device for the production of sliding doors according to claim 7, characterized in that, A heater is fixedly installed around the outside of the extraction chamber.

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