Positioning tool for spot welding in elevator door plate machining

Abstract

The invention relates to the technical field of spot welding of elevator door plates, in particular to a spot welding positioning tool for elevator door plate machining, which comprises a supporting base, the supporting base is positioned at the spot welding position of a lower component of the elevator door plate, and a lower component preliminary positioning mechanism is mounted on the supporting base and is used for positioning the lower component; a moving plate is further arranged on one side of the lower component preliminary positioning mechanism, and a moving part used for driving the moving plate is arranged on the supporting base. A telescopic piece is installed on the movable plate, a connecting frame is installed on the telescopic piece, and a component fixing mechanism is arranged at the position of the connecting frame; through the synergistic effect of the lower component preliminary positioning mechanism and the component fixing mechanism, the millimeter-level positioning precision (the positioning deviation is smaller than or equal to 0.1 mm) of the lower component at the end of the elevator door plate is achieved, deformation of a thin plate (the thickness is smaller than or equal to 2 mm) is avoided through the flexible clamping design, and the welding yield is increased.

Description

Technical Field

[0001] This invention relates to the field of elevator door panel spot welding technology, specifically to a positioning fixture for spot welding in elevator door panel processing. Background Technology

[0002] The welding of elevator door panels mainly involves the connection between the main body of the elevator door panel (flat structure) and reinforcing structural components (such as U-shaped steel, L-shaped steel or bent parts).

[0003] Furthermore, during the spot welding of the elevator door panel, the elevator door panel is conveyed to the upper component position via the assembly line. The robot arm clamps the upper component and places it stably on the elevator door panel. Then, spot welding is performed between the upper component and the elevator door panel. After the upper component is spot welded, the elevator door panel is conveyed to the middle component and lower component positions via the assembly line. One robot arm clamps and places the middle component, and another robot arm places the lower component, followed by welding.

[0004] Furthermore, due to the existing assembly line setup, when the lower component is being welded, the elevator door panel moves along with the assembly line. The existing system uses a support plate to support the lower component. When the elevator door panel moves to the position of the lower component, the support plate places the lower component on the elevator door panel, and at the same time, the protruding part of the support plate positions the elevator door panel.

[0005] The protruding part of the support plate is usually a thin plate or profile with weak rigidity. The elevator is prone to deformation under the impact of the door panel movement, resulting in positioning deviation. At the same time, the protruding part of the support plate is prone to wear due to long-term friction with the door panel, resulting in uneven positioning surface and frequent replacement. To address this, we propose a spot welding positioning fixture for elevator door panel processing. Summary of the Invention

[0006] The purpose of this invention is to provide a positioning fixture for spot welding in elevator door panel processing, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a positioning fixture for spot welding of elevator door panels, comprising a support base, wherein the support base is located at the spot welding position of the lower component of the elevator door panel, and a preliminary positioning mechanism for the lower component is installed on the support base, and the preliminary positioning mechanism for the lower component is used to position the lower component.

[0008] The lower component preliminary positioning mechanism is also provided with a movable plate on one side, and the support base is provided with a movable component for driving the movable plate.

[0009] The movable plate is equipped with a telescopic component, and a connecting frame is installed on the telescopic component. A component fixing mechanism is provided at the connecting frame, which is used to fix the lower component during spot welding.

[0010] An end positioning mechanism is also connected to the component fixing mechanism, which is used to position the end of the elevator door panel during welding.

[0011] Furthermore, the preliminary positioning mechanism for the lower component includes a lifting push rod, the output end of which is fixedly connected to a positioning base plate, and the positioning base plate is provided with a positioning groove, which is used for preliminary positioning of the lower component.

[0012] Furthermore, the component fixing mechanism includes an electric push rod, a synchronous plate, a lower pressure plate, a lower pressure block, a support guide, and a lifting component. The electric push rod is fixedly installed at the center of the top of the connecting frame, and the output end of the electric push rod is fixedly connected to the synchronous plate. There are two lower pressure plates, and the two lower pressure plates are respectively fixedly installed at both ends of the synchronous plate.

[0013] One end of the lower pressure plate is fixedly connected to a support rod, and the bottom of the support rod is fixedly connected to the lower pressure block. The lower pressure plate is used to press and fix the surface of the lower component.

[0014] Two support guides are provided, located on both sides of the synchronization plate and mounted on the connecting frame. The lifting member is connected to the support guides, and the lifting member cooperates with the lower pressure block to lift and clamp the top of the lower component.

[0015] Furthermore, the support guide includes a support base and a slider. The support base is fixedly installed on the connecting frame and has a sliding groove. The slider slides through the top of the sliding groove, and one end of the lower pressure plate is fixedly connected to the slider. The support base also has a moving opening, and the slider slides through the moving opening. Through the provided support guide, the lower pressure plate is supported and guided.

[0016] Furthermore, the lifting component includes an extension rod, a guide plate, a guide block, a connector, a push rod, a push inclined block, a roller, a lifting block, and a support component. The extension rod is fixedly installed at one end of the slider, and a vertical opening is provided on one side of the support base. The vertical opening communicates with the slide groove. The guide plate is slidably connected to one side of the support base, and a guide opening is provided on the guide plate. One end of the extension rod slides through the vertical opening and the guide opening. The connector is provided on the outside of the support base and is connected to the guide plate.

[0017] One end of the push rod is fixedly connected to the guide plate, and the other end of the push rod is fixedly connected to the push inclined block. The roller is installed at the bottom of the lifting block, and the inclined surface of the push inclined block is slidably connected to the roller. One end of the lifting block is connected to the support member, and the support member is installed on the guide plate. Through the provided lifting member, the internal top of the lower component is lifted.

[0018] Furthermore, the bottom of the lower pressure block is provided with a contoured pressing surface that is complementary to the contour of the upper surface of the lower component. The contoured pressing surface is formed by CNC milling and has a surface roughness Ra≤0.8μm.

[0019] The top of the lifting block is provided with a positioning boss that matches the shape of the inner top end of the lower component. The dimensional tolerance of the positioning boss is ±0.05mm, and it is in clearance fit with the inner top end of the lower component.

[0020] The projection positions of the pressing block and the lifting block in the horizontal direction coincide, and when the pressing block is pressed down, the resultant force applied by the positioning boss and the contour pressing surface to the lower component is perpendicular to the upper surface of the lower component.

[0021] Furthermore, the end positioning mechanism includes a rotating shaft, a positioning roller, and a synchronous adjustment component. There are two rotating shafts, which are respectively located at both ends of the connecting frame, and one end of the rotating shaft is rotatably connected to the connecting frame.

[0022] The positioning roller is fixedly sleeved on the outside of the rotating shaft. The outer surface of the positioning roller is surrounded by multiple vertical contact surfaces, and the positioning is achieved by the vertical contact surfaces at one end of the elevator door panel.

[0023] The synchronization adjustment component is located at the other end of the rotating shaft and is connected to the slider.

[0024] Furthermore, the synchronization adjustment component includes an adjustment plate, a limiting plate, a driving component, and a rotating component. The adjustment plate is slidably connected to the outside of the vertical opening and is fixedly installed on one side of the slider. The adjustment plate is provided with an oblique opening.

[0025] The limiting plate is U-shaped, and both ends of the limiting plate are fixedly connected to the support base. The adjusting plate is slidably connected to the inner side of the limiting plate. The limiting plate is provided with a limiting port. The driving component is connected to the limiting plate and is used to drive the rotating component. The rotating component is connected to the rotating shaft. Through the provided synchronous adjusting component, the state of the positioning roller is adjusted.

[0026] Furthermore, the driving component includes a driving rod, a driving block, a ratchet, a connecting spring, a ratchet wheel, a rotating shaft, and a fixing component. The driving rod slides through the oblique opening and the limiting opening, and one end of the driving rod is fixedly connected to the driving block. The driving block has an opening, and one end of the ratchet is rotatably connected to the opening through the rotating shaft. One end of the connecting spring is fixedly connected to the opening, and the other end of the connecting spring is fixedly connected to the back of the ratchet.

[0027] The ratchet meshes with the ratchet wheel, and the ratchet wheel is fixedly mounted on the top of the rotating shaft. The connecting frame is provided with a receiving shell, and the rotating shaft is rotatably connected to the top of the receiving shell. The bottom of the rotating shaft is connected to the rotating component. The fixing component is mounted on the receiving shell and is used to fix the ratchet. Through the provided driving component, the rotating component is driven.

[0028] Furthermore, the fixing component includes a fixing sleeve and an elastic member. The fixing sleeve is rotatably sleeved on the outside of the rotating shaft and is fixedly installed on the top of the receiving shell. The elastic member is installed on the top of the fixing sleeve and is used to position the ratchet. The fixing component is provided to achieve the function of positioning the ratchet.

[0029] This invention has at least the following beneficial effects:

[0030] 1. This invention achieves millimeter-level positioning accuracy (positioning deviation ≤ 0.1mm) of the lower component at the end of the elevator door panel through the synergistic action of the lower component preliminary positioning mechanism and the component fixing mechanism, and adopts a flexible clamping design to avoid deformation of thin plates (thickness ≤ 2mm), thereby improving the welding yield.

[0031] 2. The end positioning mechanism in this invention uses multiple vertical contact surfaces of the positioning rollers to rotate alternately. High-strength alloy steel (HRC45-50) and hard chrome-plated surfaces (≥800HV) enhance impact resistance (no deformation at 200N) and wear resistance. The positioning deviation is ≤0.05mm. The overall modular structure supports rapid model changeover and is compatible with multiple specifications of elevator door panels (thickness 5-15mm, width 50-200mm). The overall operating cost of the equipment is reduced. This invention effectively solves the problems of positioning deviation and frequent maintenance caused by the weak rigidity and easy wear of traditional support plates, and significantly improves the stability and economy of elevator door panel welding. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a side view of the overall structure of the present invention;

[0034] Figure 3 This is a schematic diagram of the telescopic component structure of the present invention;

[0035] Figure 4 This is a schematic diagram of the movable plate structure of the present invention;

[0036] Figure 5 This is a schematic diagram of the lower pressure block structure of the present invention;

[0037] Figure 6 This is a schematic diagram of the lower pressure plate structure of the present invention;

[0038] Figure 7 This is a schematic diagram of the push rod structure of the present invention;

[0039] Figure 8 This is a schematic diagram of the lifting block structure of the present invention;

[0040] Figure 9 This is a schematic diagram of the support structure of the present invention;

[0041] Figure 10 This is a schematic diagram of the synchronous adjustment component structure of the present invention;

[0042] Figure 11 For the present invention Figure 10 Enlarged structural diagram of region A in the middle;

[0043] Figure 12 This is a schematic diagram of the limiting plate structure of the present invention;

[0044] Figure 13 This is a schematic diagram of the rotating component structure of the present invention;

[0045] Figure 14 This is a schematic diagram of the positioning roller structure of the present invention.

[0046] In the diagram: 1-Support base; 2-Preliminary positioning mechanism for lower component; 21-Lifting push rod; 22-Positioning base plate; 3-Moving plate; 4-Moving component; 5-Telescopic component; 6-Connecting frame; 7-Component fixing mechanism; 71-Electric push rod; 72-Synchronous plate; 73-Lower pressure plate; 74-Lower pressure block; 75-Support guide component; 751-Support seat; 752-Slider; 76-Lifting component; 761-Extension rod; 762-Guide plate; 7621-Guide opening; 763-Vertical opening; 764-Connecting component; 7641-Connecting plate; 7642-Buffer spring; 7643-Connecting rod; 765-Push rod; 766-Pushing inclined block; 767-Roller; 768-Lifting block; 77-Support component; 771 - Support frame; 772- Lifting rod; 773- Support spring; 8- End positioning mechanism; 81- Rotating shaft; 82- Positioning roller; 821- Vertical contact surface; 83- Synchronous adjustment component; 84- Adjusting plate; 841- Slanted opening; 85- Limiting plate; 851- Limiting port; 86- Driving component; 861- Driving rod; 862- Driving block; 863- Ratchet; 864- Connecting spring; 865- Ratchet; 866- Rotating shaft; 867- Fixing component; 868- Fixing sleeve; 869- Elastic component; 8691- Lifting rod; 8692- Reset spring; 87- Rotating component; 871- First helical gear; 872- Second helical gear; 873- Synchronous gear; 874- Gear chain; 88- Receiving shell. Detailed Implementation

[0047] 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.

[0048] Example 1

[0049] Please see Figures 1 to 4 A positioning fixture for spot welding of elevator door panel processing includes a support base 1, which is located at the spot welding position of the lower component of the elevator door panel. A preliminary positioning mechanism 2 for the lower component is installed on the support base 1 and is used to position the lower component.

[0050] The lower component preliminary positioning mechanism 2 includes a lifting push rod 21, and a positioning base plate 22 is fixedly connected to the output end of the lifting push rod 21. The positioning base plate 22 is provided with a positioning groove, and the positioning groove is used to perform preliminary positioning of the lower component.

[0051] Specifically: In this application, the positioning groove matches the bottom contour of the lower component (such as a V-groove, U-groove, or stepped groove). The groove is embedded with a polyurethane buffer pad (hardness Shore A 80-90), which absorbs the impact force when the lower component is placed through elastic deformation, and at the same time provides a friction force of ≥30N to prevent slippage. In this application, the lower component is a U-shaped steel. The robot arm suspends the lower component 5-10mm above the positioning base plate 22. The lifting push rod 21 drives the positioning base plate 22 to rise. The guide slope of the positioning groove (such as the 15° inclination angle of the V-groove) guides the lower component to automatically center until it is fully embedded in the positioning groove, thereby achieving preliminary positioning of the lower component.

[0052] The lower component preliminary positioning mechanism 2 is also provided with a movable plate 3 on one side, and a movable component 4 for driving the movable plate 3 is provided on the support base 1.

[0053] In this application, the moving part 4 is a telescopic cylinder, which is fixedly installed on the support base 1, and the output end of the telescopic cylinder is fixedly connected to the moving plate 3. The support base 1 is also provided with a linear guide rail for guiding the moving plate 3. The stability of the moving plate 3 is ensured by the linear guide rail.

[0054] A telescopic component 5 is installed on the movable plate 3, and a connecting frame 6 is installed on the telescopic component 5. A component fixing mechanism 7 is provided at the connecting frame 6. As a further supplementary explanation, the telescopic component 5 includes a connecting push rod, a guide rod, and a guide sleeve. The connecting push rod is installed on the movable plate 3, and the output end of the connecting push rod is fixedly connected to the connecting frame 6. There are two guide rods, which are respectively fixedly installed at both ends of the bottom of the connecting frame 6. The bottom of the guide rod slides through the guide sleeve, and the guide sleeve is fixedly installed on the movable plate 3.

[0055] Thus, by operating the connecting push rod, the connecting frame 6 moves upward or downward relative to the vertical direction under the limitation of the two guide rods in the guide sleeve.

[0056] The component fixing mechanism 7 is used to fix the lower component during spot welding;

[0057] Please see Figures 4 to 7 The component fixing mechanism 7 includes an electric push rod 71, a synchronous plate 72, a lower pressure plate 73, a lower pressure block 74, a support guide 75, and a lifting member 76. The electric push rod 71 is fixedly installed at the center of the top of the connecting frame 6. The output end of the electric push rod 71 is fixedly connected to the synchronous plate 72. There are two lower pressure plates 73, which are respectively fixedly installed at both ends of the synchronous plate 72.

[0058] A support rod is fixedly connected to one end of the lower pressure plate 73, and the bottom of the support rod is fixedly connected to the lower pressure block 74. The lower pressure plate 73 is used to press and fix the surface of the lower component.

[0059] There are two support guides 75, which are located on both sides of the synchronous plate 72 and are mounted on the connecting frame 6. The lifting member 76 is connected to the support guides 75 and cooperates with the lower pressure block 74 to lift and clamp the top of the lower component.

[0060] Please see Figures 8 to 10 The support guide 75 includes a support base 751 and a slider 752. The support base 751 is fixedly installed on the connecting frame 6 and has a groove. The slider 752 slides through the top of the groove, and one end of the lower pressure plate 73 is fixedly connected to the slider 752. The support base 751 also has a moving opening, and the slider 752 slides through the moving opening.

[0061] The lifting member 76 includes an extension rod 761, a guide plate 762, a guide block 763, a connector 764, a push rod 765, a push inclined block 766, a roller 767, a lifting block 768, and a support member 77. The extension rod 761 is fixedly installed at one end of the slider 752, and a vertical opening 763 is provided on one side of the support base 751. The vertical opening 763 communicates with the slide groove. The guide plate 762 is slidably connected to one side of the support base 751, and a guide opening 7621 is provided on the guide plate 762. One end of the extension rod 761 slides through the vertical opening 763 and the guide opening 7621. The connector 764 is provided on the outside of the support base 751 and is connected to the guide plate 762. In this application, the guide opening 7621 is inclined at the bottom, and the entire guide opening 7621 is L-shaped.

[0062] When the extension rod 761 moves down to the bottom of the guide opening 7621, the guide plate 762 is pushed due to the inclined setting of the bottom of the guide opening 7621. Under the support of the connector 764, the guide plate 762 causes the push rod 765 to drive the push block 766 to move towards the roller 767.

[0063] As a further explanation, the connector 764 includes a connecting plate 7641, a buffer spring 7642, and a connecting rod 7643. The connecting plate 7641 is fixedly installed at the bottom of the guide plate 762, and the connecting rod 7643 slides through the connecting plate 7641, with both ends of the connecting rod 7643 fixedly connected to the outside of the support base 751.

[0064] One end of the buffer spring 7642 is fixedly connected to the guide plate 762, and the other end of the buffer spring 7642 is fixedly connected to the support base 751;

[0065] Thus, under the support of the connecting rod 7643 and the buffer spring 7642, the guide plate 762 is relatively stably distributed on one side outside the support base 751.

[0066] One end of the push rod 765 is fixedly connected to the guide plate 762, and the other end of the push rod 765 is fixedly connected to the push inclined block 766. The roller 767 is installed at the bottom of the lifting block 768, and the inclined surface of the push inclined block 766 is slidably connected to the roller 767. One end of the lifting block 768 is connected to the support member 77, and the support member 77 is installed on the guide plate 762.

[0067] As a further supplementary explanation, the support member 77 includes a support frame 771, a lifting rod 772, and a support spring 773. One end of the support frame 771 is fixedly connected to the guide plate 762. There are two lifting rods 772, which slide through the other end of the support frame 771 respectively. The two lifting rods 772 are fixedly installed at the bottom of one end of the lifting plate. The support spring 773 is sleeved on the outside of the lifting rod 772, and both ends of the support spring 773 are fixedly connected to the lifting plate and the support frame 771 respectively.

[0068] The bottom of the lower pressure block 74 is provided with a contoured pressing surface that is complementary to the contour of the upper surface of the lower component. The contoured pressing surface is formed by CNC milling and has a surface roughness Ra≤0.8μm.

[0069] The top of the lifting block 768 is provided with a positioning boss that matches the shape of the inner top of the lower component. The dimensional tolerance of the positioning boss is ±0.05mm, and it is in clearance fit with the inner top of the lower component.

[0070] The projection positions of the pressing block 74 and the lifting block 768 in the horizontal direction coincide, and when the pressing block 74 presses down, the resultant force exerted by the positioning boss and the contour pressing surface on the lower component is perpendicular to the upper surface of the lower component.

[0071] In this application, the top of the lower component is provided with a downward concave surface. Therefore, the positioning boss of the lifting block 768 and the contour pressing surface of the lower pressing block 74 clamp the top of the lower component together, and at the same time, further realize the positioning function of the lower component.

[0072] Specific implementation process: After the lower component is stably placed on the positioning base plate 22, the telescopic cylinder is operated, causing the two lower pressing blocks 74 and the lifting blocks 768 to move towards the lower component until the lower pressing blocks 74 move above the lower component and the two lifting blocks 768 are located inside the lower component.

[0073] Subsequently, the electric push rod 71 operates, which in turn causes the synchronous plate 72 to drive the two lower pressure plates 73 to move down synchronously. The lower pressure plates 73 then drive the lower pressure block 74 to move down via the support rod. As the lower pressure plates 73 move down, the slider 752 moves down synchronously along the inside of the support base 751. At this time, the extension rod 761 at the slider 752 moves along the vertical opening 763 and the guide opening 7621 until the extension rod 761 approaches the inclined position at the bottom of the guide opening 7621. At this time, the lower pressure block 74 is about to approach the top of the lower component. Then, the guide plate 762 is pushed through the guide opening 7621. The guide plate 762 then drives the pusher block 766 to move towards the roller 767 via the push rod 765 until the lower pressure block 74 clamps the top of the component. At the same time, the lifting block 768 lifts the top of the lower component. The lower pressure block 74 and the lifting block 768 cooperate with each other to ensure stable clamping of the lower groove component.

[0074] At this point, the positioning base plate 22 is detached from the position of the lower component, and the elevator door panel is conveyed along the assembly line, so that one end of it is conveyed to the position of the lower component.

[0075] Example 2

[0076] Please see Figures 8 to 14 Example 2 is a further supplement to Example 1. Specifically, the component fixing mechanism 7 is also connected to an end positioning mechanism 8, which is used to position the end of the elevator door panel during welding.

[0077] The end positioning mechanism 8 includes a rotating shaft 81, a positioning roller 82, and a synchronous adjustment component 83. There are two rotating shafts 81, which are respectively located at both ends of the connecting frame 6, and one end of the rotating shaft 81 is rotatably connected to the connecting frame 6.

[0078] The positioning roller 82 is fixedly sleeved on the outside of the rotating shaft 81. The outer surface of the positioning roller 82 is surrounded by multiple vertical contact surfaces 821, and the vertical contact surfaces 821 are used to position one end of the elevator door panel.

[0079] The positioning roller 82 is made of high-strength alloy steel (hardness HRC45-50), replacing the thin plate or profile structure of the traditional support plate, which increases rigidity by more than 3 times and effectively resists the impact of elevator door panel movement (no deformation when the impact force is ≤200N). The surface of the positioning roller 82 is plated with hard chrome (surface hardness ≥800HV). The alternating use of the contact surface reduces wear in a single area, extends service life, and reduces maintenance costs.

[0080] The positioning roller 82 has multiple vertical contact surfaces 821, such as 3-8, which can automatically adjust the contact angle according to the shape of the door panel end, and is compatible with elevator door panels of different specifications with a thickness of 5-15mm and a width of 50-200mm, with a positioning deviation of ≤0.05mm;

[0081] The synchronization adjustment component 83 is located at the other end of the rotating shaft 81, and the synchronization adjustment component 83 is connected to the slider 752.

[0082] The synchronous adjustment component 83 includes an adjustment plate 84, a limiting plate 85, a driving component 86, and a rotating component 87. The adjustment plate 84 is slidably connected to the outside of the vertical opening 763, and the adjustment plate 84 is fixedly installed on one side of the slider 752. The adjustment plate 84 is provided with a slanted opening 841.

[0083] The limiting plate 85 is U-shaped, and both ends of the limiting plate 85 are fixedly connected to the support base 751. The adjusting plate 84 is slidably connected to the inner side of the limiting plate 85. The limiting plate 85 is provided with a limiting port 851. The driving component 86 is connected to the limiting plate 85 and is used to drive the rotating component 87. The rotating component 87 is connected to the rotating shaft 81.

[0084] The driving component 86 includes a driving rod 861, a driving block 862, a ratchet 863, a connecting spring 864, a ratchet 865, a rotating shaft 866, and a fixing component 867. The driving rod 861 slides through the inclined opening 841 and the limiting opening 851, and one end of the driving rod 861 is fixedly connected to the driving block 862. The driving block 862 has an opening. One end of the ratchet 863 is rotatably connected to the opening through the rotating shaft. One end of the connecting spring 864 is fixedly connected to the opening, and the other end of the connecting spring 864 is fixedly connected to the back of the ratchet 863.

[0085] The ratchet 863 meshes with the ratchet 865, and the ratchet 865 is fixedly installed on the top of the rotating shaft 866. The connecting frame 6 is provided with a receiving shell 88, and the rotating shaft 866 is rotatably connected to the top of the receiving shell 88. The bottom of the rotating shaft 866 is connected to the rotating member 87. The fixing member 867 is installed on the receiving shell 88 and is used to fix the ratchet 863.

[0086] The fastener 867 includes a fixed sleeve 868 and an elastic member 869. The fixed sleeve 868 is rotatably sleeved on the outside of the rotating shaft 866 and is fixedly installed on the top of the receiving shell 88. The elastic member 869 is installed on the top of the fixed sleeve 868 and is used to position the ratchet 863.

[0087] The elastic component 869 is specifically composed of a push rod 8691 and a return spring 8692. A fixing block is also fixedly installed on the top of the fixing sleeve 868. The push rod 8691 slides through the fixing block, and the top of the push rod 8691 is rounded. The push rod 8691 limits the ratchet 865. The return spring 8692 is sleeved on the bottom of the push rod 8691. The top of the return spring 8692 is fixedly connected to the fixing block, and the bottom of the return spring 8692 is fixedly connected to the bottom of the push rod 8691.

[0088] As a further supplementary explanation, the rotating component 87 includes a first helical gear 871, a second helical gear 872, a synchronizing gear 873, and a gear chain 874. The first helical gear 871 is fixedly installed at the bottom of the rotating shaft 866 and is located inside the housing 88. The first helical gear 871 is meshed with the second helical gear 872. A synchronizing shaft is fixedly connected to the second helical gear 872 and is fixedly connected inside the housing 88. One end of the rotating shaft 81 is rotatably connected inside the housing 88. There are two synchronizing gears 873, which are respectively fixedly sleeved on the outside of the synchronizing shaft and one end of the rotating shaft 81. The gear chain 874 is driven between the two synchronizing gears 873.

[0089] Specific implementation process: In this application, when the slider 752 moves down relative to the support base 751, the drive rod 861 moves laterally along the limit port 851 under the guidance of the inclined port 841, thereby driving the drive block 862 to move synchronously.

[0090] When the drive block 862 moves synchronously, the ratchet 863 moves relative to the ratchet 865 due to the connection action of the connecting spring 864, and the ratchet 865 moves relative to the ratchet 865 due to the limiting action of the elastic member 869. The ratchet 865 does not rotate, thereby ensuring that the vertical contact surface 821 of the positioning roller 82 can contact one end of the elevator door panel, and at the same time, it plays the role of limiting the elevator door panel.

[0091] As the elevator door panel moves toward the lower component, the vertical contact surfaces 821 of the two positioning rollers 82 position one end of the elevator door panel, ensuring the positioning accuracy of the elevator door panel. Meanwhile, the lower component is stably placed on the elevator door panel, and the middle component is placed on the elevator door panel by a robotic arm and then spot welded.

[0092] After spot welding is completed, the electric push rod 71 moves in the reverse direction, and the two lower pressure blocks 74 and the lifting block 768 disengage. At the same time, the telescopic cylinder moves and the connecting push rod moves, so that the lower pressure blocks 74 and the lifting block 768 quickly disengage from the position of the lower component, without affecting the overall movement of the elevator door panel.

[0093] As the electric push rod 71 continues to operate, the slider 752 moves upward, causing the drive block 862 to move laterally along the limit port 851. While the drive block 862 moves, one end of the ratchet 863 pushes the ratchet 865 to rotate. As the ratchet 865 rotates, the rotating component 87 drives the rotating shaft 81 to rotate, which in turn causes the positioning roller 82 to rotate until the ratchet 865 stops rotating. This causes the positioning roller 82 to rotate an unused vertical contact surface 821, ensuring that the next vertical contact surface 821 contacts the elevator door panel when the positioning roller 82 performs the next positioning. This upgrades "static positioning" to "dynamic adjustable positioning." The rotating component 87 enables the space reuse of the vertical contact surface 821, further proposing the concept of "wear self-compensation," reducing downtime maintenance time, and improving the continuous operation capability of the production line.

[0094] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0095] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A positioning fixture for spot welding in elevator door panel processing, comprising a support base (1), wherein the support base (1) is located at the spot welding position of the lower component of the elevator door panel, characterized in that: The support base (1) is equipped with a lower component preliminary positioning mechanism (2), and the lower component preliminary positioning mechanism (2) is used to position the lower component; The lower component preliminary positioning mechanism (2) is also provided with a movable plate (3) on one side, and a movable part (4) for driving the movable plate (3) is provided on the support base (1). The movable plate (3) is equipped with a telescopic component (5), and a connecting frame (6) is installed on the telescopic component (5). A component fixing mechanism (7) is provided at the connecting frame (6). The component fixing mechanism (7) is used to fix the lower component when it is spot welded. An end positioning mechanism (8) is also connected to the component fixing mechanism (7), which is used to position the end of the elevator door panel during welding.

2. The positioning fixture for spot welding in elevator door panel processing according to claim 1, characterized in that: The lower component preliminary positioning mechanism (2) includes a lifting push rod (21), the output end of which is fixedly connected to a positioning base plate (22), and the positioning base plate (22) is provided with a positioning groove, which is used to perform preliminary positioning of the lower component.

3. The positioning fixture for spot welding in elevator door panel processing according to claim 1, characterized in that: The component fixing mechanism (7) includes an electric push rod (71), a synchronous plate (72), a lower pressure plate (73), a lower pressure block (74), a support guide (75), and a lifting member (76). The electric push rod (71) is fixedly installed at the center of the top of the connecting frame (6). The output end of the electric push rod (71) is fixedly connected to the synchronous plate (72). There are two lower pressure plates (73), and the two lower pressure plates (73) are respectively fixedly installed at both ends of the synchronous plate (72). One end of the lower pressure plate (73) is fixedly connected to a support rod, and the bottom of the support rod is fixedly connected to the lower pressure block (74). The lower pressure plate (73) is used to press and fix the surface of the lower component. Two support guides (75) are provided, and the two support guides (75) are located on both sides of the synchronous plate (72). The support guides (75) are installed on the connecting frame (6). The lifting member (76) is connected to the support guides (75), and the lifting member (76) cooperates with the lower pressure block (74) to lift and clamp the top of the lower component.

4. The positioning fixture for spot welding in elevator door panel processing according to claim 3, characterized in that: The support guide (75) includes a support base (751) and a slider (752). The support base (751) is fixedly installed on the connecting frame (6), and the support base (751) is provided with a sliding groove. The slider (752) slides through the top of the sliding groove, and one end of the lower pressure plate (73) is fixedly connected to the slider (752). The support base (751) is also provided with a moving opening, and the slider (752) slides through the moving opening.

5. The positioning fixture for spot welding in elevator door panel processing according to claim 3, characterized in that: The lifting member (76) includes an extension rod (761), a guide plate (762), a vertical opening (763), a connector (764), a push rod (765), a push inclined block (766), a roller (767), a lifting block (768), and a support member (77). The extension rod (761) is fixedly installed at one end of the slider (752), and a vertical opening (763) is provided on one side of the support base (751). The vertical opening (763) is connected to the slide groove. The guide plate (762) is slidably connected to one side of the support base (751), and a guide opening (7621) is provided on the guide plate (762). One end of the extension rod (761) slides through the vertical opening (763) and the guide opening (7621). The connector (764) is provided on the outside of the support base (751), and the connector (764) is connected to the guide plate (762). One end of the push rod (765) is fixedly connected to the guide plate (762), and the other end of the push rod (765) is fixedly connected to the push inclined block (766). The roller (767) is installed at the bottom of the lifting block (768), and the inclined surface of the push inclined block (766) is slidably connected to the roller (767). One end of the lifting block (768) is connected to the support member (77), and the support member (77) is installed on the guide plate (762).

6. The positioning fixture for spot welding in elevator door panel processing according to claim 3, characterized in that: The bottom of the lower pressure block (74) is provided with a contoured pressing surface that is complementary to the contour of the upper surface of the lower component. The contoured pressing surface is formed by CNC milling and has a surface roughness Ra≤0.8μm. The top of the lifting block (768) is provided with a positioning boss that matches the shape of the inner top end of the lower component. The dimensional tolerance of the positioning boss is ±0.05mm, and it is in clearance fit with the inner top end of the lower component. The projection positions of the pressing block (74) and the lifting block (768) in the horizontal direction coincide, and when the pressing block (74) presses down, the resultant force applied by the positioning boss and the contour pressing surface to the lower component is perpendicular to the upper surface of the lower component.

7. The positioning fixture for spot welding in elevator door panel processing according to claim 1, characterized in that: The end positioning mechanism (8) includes a rotating shaft (81), a positioning roller (82), and a synchronous adjustment component (83). There are two rotating shafts (81), which are respectively located at both ends of the connecting frame (6), and one end of the rotating shaft (81) is rotatably connected to the connecting frame (6). The positioning roller (82) is fixedly sleeved on the outside of the rotating shaft (81). The outer surface of the positioning roller (82) is surrounded by multiple vertical contact surfaces (821), and one end of the elevator door panel is positioned by the vertical contact surfaces (821). The synchronization adjustment member (83) is located at the other end of the rotating shaft (81), and the synchronization adjustment member (83) is connected to the slider (752).

8. The positioning fixture for spot welding in elevator door panel processing according to claim 7, characterized in that: The synchronous adjustment component (83) includes an adjustment plate (84), a limiting plate (85), a driving component (86), and a rotating component (87). The adjustment plate (84) is slidably connected to the outside of the vertical opening (763), and the adjustment plate (84) is fixedly installed on one side of the slider (752). The adjustment plate (84) is provided with a slanted opening (841). The limiting plate (85) is U-shaped, and both ends of the limiting plate (85) are fixedly connected to the support base (751). The adjusting plate (84) is slidably connected to the inner side of the limiting plate (85). The limiting plate (85) is provided with a limiting port (851). The driving member (86) is connected to the limiting plate (85) and is used to drive the rotating member (87). The rotating member (87) is connected to the rotating shaft (81).

9. The positioning fixture for spot welding in elevator door panel processing according to claim 8, characterized in that: The driving component (86) includes a driving rod (861), a driving block (862), a ratchet (863), a connecting spring (864), a ratchet wheel (865), a rotating shaft (866), and a fixing component (867). The driving rod (861) slides through the oblique opening (841) and the limiting opening (851), and one end of the driving rod (861) is fixedly connected to the driving block (862). The driving block (862) has an opening. One end of the ratchet (863) is rotatably connected to the opening through the rotating shaft. One end of the connecting spring (864) is fixedly connected to the opening, and the other end of the connecting spring (864) is fixedly connected to the back of the ratchet (863). The ratchet (863) meshes with the ratchet (865), and the ratchet (865) is fixedly installed on the top of the rotating shaft (866). The connecting frame (6) is provided with a receiving shell (88), and the rotating shaft (866) is rotatably connected to the top of the receiving shell (88). The bottom of the rotating shaft (866) is connected to the rotating part (87). The fixing part (867) is installed on the receiving shell (88), and the fixing part (867) is used to fix the ratchet (863).

10. The positioning fixture for spot welding in elevator door panel processing according to claim 9, characterized in that: The fastener (867) includes a fixed sleeve (868) and an elastic member (869). The fixed sleeve (868) is rotatably sleeved on the outside of the rotating shaft (866) and is fixedly installed on the top of the receiving shell (88). The elastic member (869) is installed on the top of the fixed sleeve (868) and is used to position the ratchet (863).

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