A sheet metal part production welding device of an intelligent door lock

Abstract

The application relates to the field of door lock processing, in particular to a sheet metal part production welding device for an intelligent door lock, which comprises a rectangular welding table, lifting frames are arranged at each corner position of the welding table, movable cross beams are arranged between two lifting frames along the length direction of the welding table, cross rods are arranged between the cross beams, the cross rods are arranged close to the lifting frames, and welding heads are symmetrically arranged on each cross rod; two adjacent welding heads are arranged at the same corner part, the welding of outer corner joints and inner corner joints is sequentially completed through the one-time downward movement and upward movement circulation of the cross beam, the corner part of the door lock shell sheet metal part forms inner and outer double-sided welds, and an approximately closed box-shaped welding structure is formed, compared with the traditional single-sided welding mode of only the outer corner joint, the double welding of the application greatly increases the effective weld thickness and bearing cross-sectional area of the corner part, improves the welding thickness and strength of the joint, and even if subsequent polishing is carried out, the welding strength of the joint can still be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of door lock processing, specifically a sheet metal welding device for intelligent door lock production. Background Technology

[0002] As a core entry point device in smart home systems, smart door locks typically employ sheet metal processing techniques for their outer casing. Specifically, thin metal sheets (such as cold-rolled steel, stainless steel, or galvanized steel) are first laser-cut or CNC punched, then bent sequentially using a CNC bending machine to form a lidless rectangular box-like structure. Due to limitations in the bending process, seams are left at the joints of adjacent side panels of this box-like structure. To ensure the overall strength and sealing of the casing, these seams must be welded.

[0003] In existing technologies, due to limitations in tooling structure, welding space, and appearance consistency requirements, welding is often performed on the outer corner joints, i.e., continuous or intermittent welding is carried out along the outer edge. This welding method is more common in actual production and has the advantages of simple operation and relatively low requirements for positioning accuracy.

[0004] However, long-term practice has revealed certain limitations of this type of single corner welding: First, the corner welds are mainly distributed on the outer surface of the workpiece, and the weld penetration and fusion area are limited, resulting in insufficient strengthening of the inner joint surface. When subjected to external impact or torsional load, stress concentration is easily generated at the root of the joint, thus affecting the overall structural strength.

[0005] Secondly, in order to meet the product appearance quality requirements, the outer corner welds usually need to be ground after welding to make the transition smooth. However, the grinding process inevitably removes some weld metal, which reduces the original weld cross-sectional area, further weakens the connection strength, and may even form a weak area in some places. The load-bearing capacity of the joint will decrease for a second time, reducing the durability and reliability of the product.

[0006] Therefore, a sheet metal welding device for smart door locks is proposed to address the above problems. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0008] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a sheet metal part production welding device for a smart door lock, including a rectangular welding table, a lifting frame is provided at each corner of the welding table, a horizontal beam that can move up and down is provided between two lifting frames along the length of the welding table, a horizontal bar is provided between the horizontal beams, the horizontal bar is set close to the lifting frame, a welding head is symmetrically provided on each horizontal bar, a welding head is provided at the end of each horizontal beam, and two adjacent welding heads are used to weld the outer corner joints and inner corner joints of the sheet metal parts; Two sets of guide wheels are symmetrically arranged on the welding platform. Each set of guide wheels is arranged along the length of the welding platform. Multiple guide wheels near the material inlet end of the welding platform are arranged in a flared shape. A position limiting plate is located near the material outlet end of the welding platform and is fixed to the outer wall of the welding platform.

[0009] Preferably, a feeding assembly is provided on one side of the welding table inlet end. The feeding assembly includes a pallet, the upper surface of which is flush with the upper surface of the welding table. A notch is opened on one side of the pallet, and a feeding conveyor belt is provided in the notch. The upper surface of the feeding conveyor belt is higher than the upper surface of the pallet. A push plate is provided at one end of the pallet. A push rod is provided on the side wall of the push plate opposite to the welding table inlet end. The push rod is slidably connected to a groove opened on the other side of the pallet, and the push rod is used to push the sheet metal parts on the feeding conveyor belt onto the welding table.

[0010] Preferably, each of the crossbeams is provided with a feeding assembly, which includes L-shaped rods symmetrically arranged on the crossbeams, and a lifting plate is rotatably connected to the lower end of the L-shaped rods; a plurality of clearance grooves are provided on the welding table, and each clearance groove is provided corresponding to a lifting plate. The push plate is equipped with a feeding rod, the end of which extends above the material inlet of the welding table.

[0011] Preferably, a groove is formed on the welding platform at a position corresponding to the guide wheel, a slider is provided in the groove, the guide wheel is set on the slider, and each slider is connected to the inner side of the groove by a spring. When the sheet metal part moves between the two sets of guide wheels, the guide wheel is pressed against the sheet metal part by the elastic force of the spring of each slider.

[0012] Preferably, the lower half of the vertical portion of each L-shaped rod is provided with a concave corner; Multiple sliders on the same side of the welding station are connected to a connecting rod. A roller is rotatably connected to the part of the connecting rod opposite to the relief groove. When the L-shaped rod moves down, it presses against the roller. The roller drives the connecting rod to pull the slider outward, and the guide wheel loses its pressure on the sheet metal part.

[0013] Preferably, each spring has an inner ring with a branch pipe fixed to the slider, and an oil passage is opened on the inner side wall of the slider. The oil outlet of the oil passage is connected to the rotation connection point between the guide wheel and the slider, and the oil inlet of the oil passage is connected to the branch pipe. The end of the branch pipe is sealed and slidably connected to the insertion hole opened inside the welding table, and the insertion hole is connected to the external oil pump through an oil pipe.

[0014] Preferably, the top of the two lifting frames at the material inlet end of the welding table is provided with a support frame, the end of the support frame extends downward and is fixedly connected with a sleeve for sliding the material feed rod, the sleeve is used to stabilize the horizontal movement of the material feed rod.

[0015] Preferably, the top of the two lifting frames at the feeding end of the welding table is provided with a horizontal plate, the upper surface of the horizontal plate is provided with a sleeve, the sleeve is provided with an insert tube, the insert tube has an inlet and an outlet, the lower end of the insert tube passes through the horizontal plate and is connected to the lower surface of the horizontal plate by a compression spring; the sleeve is connected to an oil supply pipe and an oil outlet pipe, and the inlet and outlet of the insert tube are used to connect the oil supply pipe and the oil outlet pipe; The oil outlet pipe is laid along the support frame, and the end of the oil outlet pipe extends to the surface of the inner ring of the casing.

[0016] Preferably, the discharge end of the welding station is provided with a guide plate, which is located above the limiting plate, and the end of the guide plate extends downward at an angle.

[0017] Preferably, each of the lifting plates has multiple rotating grooves on its upper surface, and each rotating groove contains ball bearings.

[0018] The advantages of this invention are: 1. In this invention, by arranging two adjacent welding heads at the same corner and using the alternating downward and upward movement of the crossbeam, the welding of the outer corner joint and the inner corner joint are completed sequentially, so that the corner of the door lock shell sheet metal part forms double-sided welds, forming an approximately closed box-shaped welding structure. Compared with the traditional method of welding only one side of the outer corner joint, the double welding of this invention significantly increases the effective weld thickness and load-bearing cross-sectional area of ​​the corner, improves the weld thickness and strength at the joint, and even if it is subsequently ground, the weld strength at the connection can still be guaranteed.

[0019] 2. In this invention, sequential welding effectively avoids the thin plate burning through. The sequential welding method of first welding the outer corners and then the inner corners, rather than welding the inner and outer corners simultaneously, is adopted. Since the thickness of the sheet metal parts of the smart door lock shell is usually only 0.8 mm to 1.5 mm, if the inner and outer corners are welded at the same time, the corner area will be subjected to double heat input superposition. Excessive heat accumulation can easily lead to the thin plate burning through, collapsing, or even melting through. However, the sequential welding mode of this invention allows the outer corners to be welded and then allowed to undergo a short period of heat dissipation and cooling before the inner corners are welded. This effectively disperses the heat input, avoids local overheating, reduces the risk of the thin-walled sheet metal parts burning through, and ensures the quality of the weld formation. Attached Figure Description

[0020] Figure 1 This is a first-view perspective perspective view of the welding device in this invention; Figure 2 This is a second-view perspective perspective view of the welding device in this invention; Figure 3 This is a front view of the welding apparatus in this invention; Figure 4 This is a top view of the welding apparatus in this invention; Figure 5 This is a perspective view of the sheet metal parts welded in this invention; Figure 6 This is a schematic diagram of the blank material for the sheet metal part in this invention; Figure 7 This is a perspective view of the cooperation between the crossbeam and the L-shaped rod in this invention; Figure 8 This is a schematic diagram illustrating the cooperation between the support frame and the lifting frame in this invention; Figure 9 This is a cross-sectional view of the sleeve in this invention; Figure 10 This is a perspective view of the welding station in this invention; Figure 11 This is a top view of the welding station in this invention; Figure 12 This is a perspective view of the feeding component in this invention. Figure 13 This is a schematic diagram of the cooperation between the slider and the guide wheel in this invention.

[0021] In the diagram: 101, Sheet metal part; 102, Outer corner joint; 103, Inner corner joint; 1, Welding table; 2, Lifting frame; 3, Crossbeam; 4, Welding head; 5, Guide wheel; 6, Limiting plate; 7, Servo motor; 8, Support plate; 9, Feeding conveyor belt; 10, Push plate; 11, Push rod; 12, Slide groove; 13, L-shaped rod; 14, Lifting plate; 15, Clearance groove; 16, Discharge rod; 17, Groove; 18, Slider; 19, Concave corner; 20, Connecting rod; 21, Roller; 22, Spring; 23, Branch pipe; 24, Support frame; 25, Sleeve; 26, Horizontal plate; 27, Sleeve; 28, Insertion pipe; 29, Inlet; 30, Outlet; 31, Oil supply pipe; 32, Oil outlet pipe; 33, Guide plate; 34, Ball bearing; 35, Insertion hole. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] Reference Figure 1 - Figure 11A welding device for producing sheet metal parts for smart door locks, the welding device being used for welding such as Figure 5 A rectangular sheet metal part 101 of the shape shown, and the sheet metal part 101 as... Figure 6 The blank shown is bent by a CNC machine tool, forming an outer corner joint 102 and an inner corner joint 103 at the bend. To achieve welding of the outer corner joint 102 and the inner corner joint 103, a welding device is set up, including a rectangular welding table 1 and a control system located at the bottom of the welding table 1. The control system is used to control the entire welding device to achieve intelligent welding. A lifting frame 2 is set at each corner of the welding table 1. A horizontal beam 3 that can move up and down is set between two lifting frames 2 along the length of the welding table 1. A crossbar is set between the crossbeams 3. The crossbar is set close to the lifting frame 2. A welding head 4 is symmetrically set on each crossbar. A welding head 4 is set at the end of each crossbeam 3. Welding head 4, and two adjacent welding heads 4 are used to weld the outer corner joint 102 and inner corner joint 103 of the sheet metal part 101. In this embodiment, the welding is laser welding and is operated by the control system to realize automatic intelligent welding. Two sets of guide wheels 5 are symmetrically arranged on the welding table 1. Each set of guide wheels 5 is arranged along the length direction of the welding table 1. Multiple guide wheels 5 near the material inlet end of the welding table 1 are arranged in a flared shape. A position limiting plate 6 is located near the material outlet end of the welding table 1. The position limiting plate 6 is fixed on the outer wall of the welding table 1. The guide wheels 5 are used to guide and initially position the pushed sheet metal part 101. The position limiting plate 6 is used to precisely limit the sheet metal part 101. In this embodiment of the invention, the crossbeam 3 is driven to move by a drive assembly, which includes a servo motor 7 mounted on the top of the lifting frame 2. The output shaft of the servo motor 7 is connected to a vertically arranged lead screw, the lower end of which is rotatably connected to the welding table 1 via a bearing. The lead screw is threadedly engaged with a threaded hole at the end of the crossbeam 3. The servo motors 7 on the top of the four lifting frames 2 are synchronously controlled by the same control system to ensure that the two ends of the crossbeams 3 rise and fall synchronously, preventing the crossbeams 3 from tilting. During welding, the sheet metal part 101 is pushed in and guided by the flared guide wheel 5 before sliding to the limit plate 6 for positioning. Specifically, a touch switch can be installed on the limit plate 6. When the sheet metal part 101 presses against the touch switch, it indicates that the sheet metal part 101 is ready for welding. Afterwards, the control system starts the servo motor 7 to drive the lead screw to rotate forward. The crossbeam 3 drives the two adjacent welding heads 4 to move downwards at a uniform speed. During this downward movement, the welding heads 4 on the outer side of the sheet metal part 101 emit laser beams, first targeting the outer corner joint 102 of the sheet metal part 101. Welding is performed; after the outer corner joint 102 is welded, the servo motor 7 reverses, and the crossbeam 3 drives the welding head 4 to move upward at a constant speed. During the upward movement, the welding head 4 on the inner side of the sheet metal part 101 emits a laser beam to weld the inner corner joint 103 of the same corner. One downward and upward cycle can complete the double welding of the outer and inner corners of the corner. The crossbeam 3 moves upward to complete the welding of the inner corner joint 103, and then continues to move upward to complete the reset. After that, the welded sheet metal part 101 is removed, and then the next sheet metal part 101 is pushed into the welding table 1 to perform the above operation. This invention arranges two adjacent welding heads 4 at the same corner and completes the welding of the outer corner joint 102 and the inner corner joint 103 in sequence by means of a downward and upward cycle of the crossbeam 3. This makes the corner of the door lock shell sheet metal part 101 form double-sided welds, forming an approximately closed box-shaped welding structure. Compared with the traditional method of welding only one side of the outer corner joint 102, the double welding of this invention greatly increases the effective weld thickness and load-bearing cross-sectional area of ​​the corner, improves the weld thickness and strength at the joint, and ensures that the weld strength at the connection can still be guaranteed even after subsequent grinding. This invention effectively avoids the problem of thin plates burning through by welding sequentially. It adopts a sequential welding method, welding the outer corners first and then the inner corners, instead of welding the inner and outer corners simultaneously. Since the thickness of the sheet metal part 101 of the smart door lock shell is usually only 0.8 mm to 1.5 mm, if the inner and outer corners are welded at the same time, the corner area will be subjected to double heat input superposition. Excessive heat accumulation can easily lead to the thin plate burning through, collapsing, or even melting through. The sequential welding mode of this invention allows the outer corners to be welded and then allowed to cool down briefly before the inner corners are welded. This effectively disperses the heat input, avoids local overheating, reduces the risk of the thin-walled sheet metal part 101 burning through, and ensures the quality of the weld formation.

[0024] Reference Figure 1 - Figure 12The welding table 1 has a feeding assembly on one side of the feeding end. The feeding assembly includes a pallet 8. The upper surface of the pallet 8 is flush with the upper surface of the welding table 1. A notch is opened on one side of the pallet 8, and a feeding conveyor belt 9 is provided in the notch. The upper surface of the feeding conveyor belt 9 is higher than the upper surface of the pallet 8. A push plate 10 is provided at one end of the pallet 8. A push rod 11 is provided on the side wall of the push plate 10 opposite to the feeding end of the welding table 1. The push rod 11 is slidably connected in a groove 12 opened on the other side of the pallet 8. The groove 12 is arranged along the length of the pallet 8. The push rod 11 is slidably connected in the groove 12. The groove 12 guides and limits the push rod 11, ensuring that the push rod 11 and the push plate 10 reciprocate in a straight line. The push rod 11 is driven by a linear drive element (such as a cylinder, an electric push rod 11, or a linear module) to push the sheet metal part 101 on the feeding conveyor belt 9 to the welding table 1 along the length of the pallet 8. During the loading operation, the operator or the robot arm of the previous process places the sheet metal part 101 on the loading conveyor belt 9. The bottom of the sheet metal part 101 is slightly lifted by the upper surface of the conveyor belt. At this time, the loading conveyor belt 9 can remain stationary or run at low speed, initially conveying the sheet metal part 101 to a position close to the push plate 10. Subsequently, the linear drive element drives the push rod 11 to move along the slide 12 towards the welding table 1. The push plate 10 contacts the end face of the sheet metal part 101 and pushes it smoothly onto the welding table 1. After the sheet metal part 101 enters the welding table 1, it continues to slide to the limit plate 6 under the guidance of the flared guide wheel 5 to complete the fine positioning. Then the push rod 11 drives the push plate 10 back to its original position, waiting for the next loading. In conjunction with the control system, automated feeding is achieved, reducing the proportion of manual intervention and improving production safety and efficiency. The push rod 11 is driven by a linear drive element and works with the feeding conveyor belt 9 to achieve automatic feeding of sheet metal parts 101. There is no need for manual handling of sheet metal parts 101 one by one onto the welding table 1, which reduces the labor intensity of operators, avoids the safety hazards caused by manual approach to the welding station, and shortens the feeding cycle time, thereby improving the automation level and production efficiency of the entire production line. After the feeding component pushes the sheet metal part 101 to the welding table 1, the flared guide wheel 5 guides and coarsely positions the sheet metal part 101, and the limiting plate 6 achieves precise stopping. The feeding component, guide wheel 5 and limiting plate 6 work together to make the entire positioning process of the sheet metal part 101 from placement to welding smooth and continuous, without the need for secondary manual adjustment, which further improves the level of automated production in the intelligent manufacturing equipment industry.

[0025] Reference Figure 1 - Figure 8Each of the crossbeams 3 is provided with a feeding assembly, which includes L-shaped rods 13 symmetrically arranged on the crossbeams 3, and a lifting plate 14 is rotatably connected to the lower end of the L-shaped rods 13; a plurality of clearance grooves 15 are provided on the welding table 1, and the clearance grooves 15 are respectively provided with the lifting plates 14; a feeding rod 16 is provided on the push plate 10, and the end of the feeding rod 16 extends to the top of the feeding end of the welding table 1; The lifting plate 14 is rotatably connected to the lower end of the L-shaped rod 13 via a torsion spring. The lifting plate 14 moves down and presses against the edge of the sheet metal part 101, then deflects and moves into the clearance groove 15. Then, under the torsion of the torsion spring, it automatically rotates horizontally. When welding the inner corner joint 103, the crossbeam 3 first moves upward in the first stroke to complete the welding of the inner corner joint 103. At this time, the lifting plate 14 is still below the sheet metal part 101. Then, the crossbeam 3 moves upward in the second stroke, the lifting plate 14 contacts the sheet metal part 101, and lifts the sheet metal part 101, separating it from the welding table 1, and raising it to the same horizontal height as the unloading rod 16. Then, the loading component is operated. The push rod 11 cooperates with the push plate 10 to push the new sheet metal part 101 onto the welding table 1. At the same time, the push plate 10 drives the unloading rod 16 to move. The unloading rod 16 pushes the sheet metal part 101 that has been welded above the welding table 1 away to realize unloading. The crossbeam 3 moves upward in two strokes, and the welding and unloading actions are carried out in a timely and orderly manner without interference. Specifically, when the crossbeam 3 moves upward in the first stroke to complete the welding of the inner corner joint 103, the lifting plate 14 is located below the sheet metal part 101 and does not contact it, ensuring that the welding process is not interfered with by the unloading mechanism. After the welding is completed, the crossbeam 3 continues to move upward in the second stroke, and only then does the lifting plate 14 contact the sheet metal part 101 and lift it away from the welding table 1. The double-stroke design of welding first and then lifting makes the welding operation and the unloading preparation action orderly connected on the same lifting mechanism, avoiding motion interference between mechanisms and ensuring welding quality. The push rod 11, in conjunction with the push plate 10, pushes the new sheet metal part 101 for feeding, while simultaneously driving the unloading rod 16 to move synchronously. The unloading rod 16 pushes the already welded sheet metal part 101, which has been lifted to the same horizontal height by the lifting plate 14, away from the welding table 1. The feeding and unloading actions are completed in the same cycle, eliminating the need for a separate unloading drive device and additional unloading cycle, which significantly shortens the production cycle and improves equipment utilization and the overall capacity of the automated production line.

[0026] Reference Figure 10 - Figure 13 A groove 17 is provided on the welding table 1 at a position corresponding to the guide wheel 5. A slider 18 is provided in the groove 17. The guide wheel 5 is set on the slider 18. Each slider 18 is connected to the inner side of the groove 17 by a spring 22. The sheet metal part 101 moves between the two sets of guide wheels 5. Each slider 18 causes the guide wheel 5 to be pressed against the sheet metal part 101 by the elastic force of the spring 22. When sheet metal part 101 enters from the flared guide end, its sidewall first contacts the guide wheel 5, pushing the slider 18 outward to stretch the spring 22. The guide wheel 5 provides a smooth feeding channel for the sheet metal part 101, avoiding rigid jamming. When the sheet metal part 101 continues to slide to the welding station and is precisely positioned by the limiting plate 6, the spring 22 rebounds, pushing the slider 18 and guide wheel 5 back inward, elastically clamping the sheet metal part 101 between the two sets of guide wheels 5. This achieves a seamless switch between flexible yielding in the feeding stage and elastic locking in the welding stage, ensuring both smooth feeding and stability of the sheet metal part 101 during welding. Reference Figure 1 - Figure 13 Each L-shaped rod 13 has a concave corner 19 in the lower half of its vertical part; multiple sliders 18 on the same side of the welding table 1 are connected to a connecting rod 20 on their outer sides; a roller 21 is rotatably connected to the part of the connecting rod 20 opposite to the relief groove 15; the L-shaped rod 13 moves down to squeeze the roller 21; the roller 21 drives the connecting rod 20 to pull the slider 18 outward; the guide wheel 5 loses its squeezing of the sheet metal part 101. The crossbeam 3 has its power reused, and the guide wheel 5 is released without the need for an additional drive source. The L-shaped rod 13 moves down synchronously with the crossbeam 3. The downward movement is divided into two strokes. In the first stroke, the lower end of the L-shaped rod 13 presses against the roller 21. The roller 21 rotates and simultaneously pulls the slider 18 outward through the connecting rod 20. The slider 18 drives the guide wheel 5 to move outward and no longer presses against the sheet metal part 101. At this time, the sheet metal part 101 is in a relaxed state and can adjust its state on its own. For example, the sheet metal part 101 enters the pressing guide wheel 5, and the guide wheel 5 contacts the burrs on the surface of the sheet metal part 101. The sheet metal part 101 tilts to one side, and when the guide wheel 5 disengages from the sheet metal part 101, the sheet metal part 101 can adjust itself to a horizontal state, which provides strong support for subsequent high-quality welding. In the second stroke, the concave corner 19 is opposite to the roller 21. At this time, the roller 21 loses the pressure of the L-shaped rod 13, the slider 18 and the guide wheel 5 are reset, and the guide wheel 5 presses against the sheet metal part 101 again, stabilizing the sheet metal part 101 for welding. Within the second stroke, the welding head 4 can complete the welding of the outer corner joint 102 of the sheet metal part 101. When the L-shaped rod 13 moves upward, it is divided into two strokes. The first stroke is the first stroke of the crossbeam 3, which completes the welding of the inner corner joint 103. At this time, the roller 21 is still opposite to the concave corner 19. Then the second stroke is carried out, which is the second stroke of the crossbeam 3. The lifting plate 14 lifts the sheet metal part 101, and at the same time, the L-shaped rod 13 squeezes the roller 21. The roller 21 drives the slider 18 and the guide wheel 5 to move outward through the connecting rod 20. The guide wheel 5 no longer squeezes the sheet metal part 101. At this time, the sheet metal part 101 is in a free state and is lifted, which improves the smoothness of the upward movement of the sheet metal part 101. It forms a linkage structure with the up and down movement of the crossbeam 3, and completely reuses the original lifting power of the crossbeam 3. There is no need to configure a separate cylinder, motor or electromagnet or other drive components to release the guide wheel 5. This significantly simplifies the structure and control logic of the welding equipment and reduces manufacturing costs and energy consumption.

[0027] Reference Figure 1 - Figure 13 Each spring 22 has an inner ring with a branch pipe 23, which is fixed to the slider 18. An oil passage is opened on the inner side wall of the slider 18. The oil outlet of the oil passage is connected to the rotation connection point between the guide wheel 5 and the slider 18. The oil inlet of the oil passage is connected to the branch pipe 23. The end of the branch pipe 23 is sealed and slidably connected to the insertion hole 35 opened inside the welding table 1. The insertion hole 35 is connected to the external oil pump through an oil pipe. During the movement of slider 18, the oil circuit remains continuously connected, achieving automatic lubrication throughout the entire stroke. The end of branch pipe 23 is connected to the insertion hole 35 inside welding table 1 with a sealed sliding connection. When slider 18 reciprocates within groove 17, branch pipe 23 slides in a piston-like manner within insertion hole 35. The sealed fit between the two always keeps the oil circuit unobstructed. Whether slider 18 is in the clamped position of spring 22 or pulled to the released position by connecting rod 20, lubricating oil can be continuously delivered to the rotating connection point of guide wheel 5 through insertion hole 35, branch pipe 23, and oil passage. This achieves uninterrupted automatic lubrication of guide wheel 5 throughout the entire stroke range of clamping and releasing. The oil passage is located on the inner side wall of slider 18, and the oil outlet is directly connected to the rotating connection point (bearing or shaft) between guide wheel 5 and slider 18. Lubricating oil is precisely delivered to the friction pair surface by oil supply pump through a closed oil circuit, reducing lubricating oil waste and improving the utilization efficiency and lubrication effect of lubricant.

[0028] Reference Figure 7 and Figure 8 The welding table 1 has two lifting frames 2 at the feeding end with a support frame 24 on top. The end of the support frame 24 extends downward and is fixedly connected to a sleeve 25 for sliding the unloading rod 16. The sleeve 25 is used to stabilize the horizontal movement of the unloading rod 16. The sleeve 25 provides rigid guidance, effectively suppressing the cantilever sway of the unloading rod 16, ensuring precise and stable pushing action. Specifically, when the unloading rod 16 reciprocates horizontally under the drive of the push plate 10, its long length and the fact that one end is connected to the push plate 10 while the other end extends cantilevered above the welding table 1 make it prone to bending deformation and vertical swaying due to its own weight or pushing resistance during the pushing process. The sleeve 25, fixed to the end of the support frame 24 and extending downward, forms a sliding wrapping guide constraint on the unloading rod 16 throughout its entire stroke, transforming the cantilever beam into a simple and stable support and guide structure. This improves the horizontal stiffness and linear motion accuracy of the unloading rod 16, ensuring that the end of the unloading rod 16 is stable and does not skew when pushing the sheet metal part 101, thus avoiding incomplete pushing or collision damage to the sheet metal part 101 caused by rod vibration.

[0029] Reference Figure 7 - Figure 9 The welding table 1 has two lifting frames 2 at the feeding end with a horizontal plate 26 on top. The upper surface of the horizontal plate 26 is provided with a sleeve 27. The sleeve 27 is provided with a tube 28. The tube 28 has an inlet 29 and an outlet 30. The lower end of the tube 28 passes through the horizontal plate 26 and is connected to the lower surface of the horizontal plate 26 by a compression spring. The sleeve 25 is connected to the oil supply pipe 31 and the oil outlet pipe 32. The inlet 29 and the outlet 30 on the tube 28 are used to connect the oil supply pipe 31 and the oil outlet pipe 32. The oil outlet pipe 32 is laid along the support frame 24 and the end of the oil outlet pipe 32 extends to the inner surface of the sleeve 25. The lubrication is mechanically triggered by the reciprocating motion of the feed rod 16, eliminating the need for additional electrically controlled valves. The structure is simple and reliable. Specifically, the insert 28 is normally in a low position under the action of a compression spring, with its inlet 29 and outlet 30 misaligned with the oil supply pipe 31 and outlet pipe 32 on the sleeve 25. When the welding head 4 moves upward and resets, the upper end of the welding head 4 presses upward against the insert 28, precisely connecting the inlet 29 and outlet 30 on the insert 28 with the oil supply pipe 31 and outlet pipe 32 respectively. The oil circuit is instantly opened, and lubricating oil is directly delivered through the insert 28 and outlet pipe 32 to the sliding friction interface between the feed rod 16 and the sleeve 25. This achieves targeted, directional, and quantitative lubrication of the guide friction pair, resulting in a uniform and precise oil film distribution, effectively reducing the friction of the feed rod 16 on the sleeve 25. The frictional resistance and wear rate during internal sliding; the lubrication triggering mechanism relies entirely on the mechanical switching control of the welding head 4's own movement stroke, eliminating the need for solenoid valves, sensors, or additional control circuits, greatly simplifying the structure of the lubrication system and reducing failure rate and maintenance costs; at the same time, it provides intermittent oil supply on demand, avoiding continuous dripping, resulting in high lubricant utilization and a clean work surface. The insertion tube 28 only conducts oil passages during a short stroke under compression. When the welding head 4 moves down, the insertion tube 28 resets under the action of the compression spring, and the oil passage is automatically cut off. The intermittent lubrication mode of follow-up triggering and immediate oil supply avoids the problems of excessive lubricant accumulation and dripping contamination of the welding table 1 and the surface of the sheet metal part 101, significantly improving the utilization rate of lubricant while maintaining the cleanliness of the welding environment.

[0030] Reference Figure 1 - Figure 4 The welding station 1 has a guide plate 33 at its discharge end. The guide plate 33 is located above the limiting plate 6, and the end of the guide plate 33 extends downward at an angle. It receives and guides the sheet metal part 101 to slide down automatically, realizing unpowered material feeding, reducing equipment costs, and preventing the sheet metal part 101 from falling directly, thus preventing collision deformation and surface damage.

[0031] Reference Figure 7 Each of the lifting plates 14 has multiple rotating grooves on its upper surface, and each rotating groove is provided with a ball bearing 34. After the sheet metal part 101 is lifted, it falls on top of the ball bearing 34. When the unloading rod 16 pushes the sheet metal part 101, a rolling contact is formed between the bottom of the sheet metal part 101 and the ball bearing 34, which reduces the rolling friction coefficient. The unloading rod 16 only needs a small pushing force to push the sheet metal part 101 away smoothly, which improves the smoothness of unloading.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sheet metal welding device for producing smart door locks, characterized in that: It includes a rectangular welding table, with a lifting frame at each corner of the welding table. A horizontal beam that can move up and down is provided between two lifting frames along the length of the welding table. A crossbar is provided between the cross beams and is located close to the lifting frame. A welding head is symmetrically provided on each crossbar. A welding head is provided at the end of each cross beam, and two adjacent welding heads are used to weld the outer corner joints and inner corner joints of the sheet metal parts. Two sets of guide wheels are symmetrically arranged on the welding platform. Each set of guide wheels is arranged along the length of the welding platform. Multiple guide wheels near the material inlet end of the welding platform are arranged in a flared shape. A position limiting plate is located near the material outlet end of the welding platform and is fixed to the outer wall of the welding platform.

2. The sheet metal welding device for intelligent door lock production according to claim 1, characterized in that: The welding table has a feeding assembly on one side of the inlet end. The feeding assembly includes a pallet, the upper surface of which is flush with the upper surface of the welding table. A notch is opened on one side of the pallet, and a feeding conveyor belt is installed in the notch. The upper surface of the feeding conveyor belt is higher than the upper surface of the pallet. A push plate is provided at one end of the pallet. A push rod is provided on the side wall of the push plate opposite to the inlet end of the welding table. The push rod is slidably connected to a groove opened on the other side of the pallet, and the push rod is used to push the sheet metal parts on the feeding conveyor belt onto the welding table.

3. The sheet metal welding device for intelligent door lock production according to claim 2, characterized in that: Each of the crossbeams is provided with a feeding assembly, which includes L-shaped rods symmetrically arranged on the crossbeams, and a lifting plate is rotatably connected to the lower end of the L-shaped rods; multiple clearance grooves are provided on the welding table, and each clearance groove is provided in a corresponding manner to the lifting plate. The push plate is equipped with a feeding rod, the end of which extends above the material inlet of the welding table.

4. The sheet metal welding device for intelligent door lock production according to claim 3, characterized in that: A groove is made on the welding platform at a position corresponding to the guide wheel. A slider is provided in the groove, and the guide wheel is set on the slider. Each slider is connected to the inner side of the groove by a spring. When the sheet metal part moves between the two sets of guide wheels, the guide wheel is pressed against the sheet metal part by the elastic force of the spring of each slider.

5. The sheet metal welding device for intelligent door lock production according to claim 3, characterized in that: The lower half of the vertical portion of each L-shaped rod is provided with a concave corner; Multiple sliders on the same side of the welding station are connected to a connecting rod. A roller is rotatably connected to the part of the connecting rod opposite to the relief groove. When the L-shaped rod moves down, it presses against the roller. The roller drives the connecting rod to pull the slider outward, and the guide wheel loses its pressure on the sheet metal part.

6. The sheet metal welding device for producing intelligent door locks according to claim 4, characterized in that: Each spring has an inner ring with a branch pipe fixed to the slider. An oil passage is opened on the inner wall of the slider. The oil outlet of the oil passage is connected to the rotation connection point between the guide wheel and the slider. The oil inlet of the oil passage is connected to the branch pipe. The end of the branch pipe is sealed and slidably connected to the insertion hole opened inside the welding table. The insertion hole is connected to the external oil pump through an oil pipe.

7. The sheet metal welding device for intelligent door lock production according to claim 6, characterized in that: The welding table has two lifting frames at the top of which are equipped with support frames. The ends of the support frames extend downward and are fixed with sleeves for sliding the unloading rod. The sleeves are used to stabilize the horizontal movement of the unloading rod.

8. The sheet metal welding device for intelligent door lock production according to claim 7, characterized in that: The welding table has two lifting frames at the top of a horizontal plate. A sleeve is provided on the upper surface of the horizontal plate, and an insert is provided inside the sleeve. The insert has an inlet and an outlet. The lower end of the insert passes through the horizontal plate and is connected to the lower surface of the horizontal plate by a compression spring. The sleeve is connected to an oil supply pipe and an oil outlet pipe. The inlet and outlet of the insert are used to connect the oil supply pipe and the oil outlet pipe. The oil outlet pipe is laid along the support frame, and the end of the oil outlet pipe extends to the surface of the inner ring of the casing.

9. The sheet metal welding device for producing intelligent door locks according to claim 8, characterized in that: The welding station has a guide plate at the discharge end, which is located above the limiting plate and extends downward at its end.

10. The sheet metal welding device for producing intelligent door locks according to claim 3, characterized in that: Multiple slots are formed on the upper surface of each lifting plate, and each slot contains ball bearings.

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