A metal A-frame ladder front ladder assembly device

Abstract

The application discloses a metal A-frame ladder front ladder assembling device, which comprises a ladder pipe feeding mechanism, a horizontal drilling mechanism, a foot sleeve installing mechanism, a front ladder accessory shaping mechanism and a front ladder accessory shaping mechanism; the ladder pipe is horizontally transferred to a horizontal drilling station, the horizontal drilling mechanism clamps, horizontally transfers and clamps and fixes the ladder pipe, drills and / or punches the inner side of the ladder pipe; the foot sleeve installing mechanism pushes the foot sleeve into the end of the ladder pipe, then applies external force to extrude and deform, so as to fix and limit the foot sleeve at the end of the ladder pipe; the front ladder accessory shaping mechanism respectively clamps, inclines and turns the ladder pipe, the cross rod and the top pedal, and places them in a figure-eight shape on a preset position, so that the frame installation of the front ladder is completed; the vertical drilling mechanism transfers the front ladder to a vertical drilling station, locks the cross rod and the top pedal on the ladder pipe, and completes the overall fixation of the frame of the front ladder. The assembling device has the advantages of reasonable structure, simple operation, high automation degree, high efficiency and maximized production benefit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal piece processing and assembling, in particular to an automatic feeding, drilling, extruding and deforming production line for the front ladder leg of a metal folding ladder. BACKGROUND

[0002] With the development of society and industry, people's living and office space is relatively reduced, and most of the general household appliances require simple operation and easy folding and moving to reduce the occupied space. The metal folding ladder is widely used by the public due to its simple structure and easy storage and carrying after folding.

[0003] In combination Figure 1 , the metal folding ladder includes a front ladder A and a rear ladder B movably connected to the front ladder. The front ladder and the rear ladder are usually switched between an unfolded state and a folded state to meet the use needs of people at different periods. The front ladder refers to a climbable structure with several steps connected and supported between two ladder pipes, which is the core component of the metal ladder. The two ladder pipes are arranged in a figure-eight shape to support the two sides of the front ladder. The step refers to a horizontal rod on the front ladder for stepping, which is usually composed of multiple inconsistent horizontal rods with gradually narrowing lengths. The bottom of the front ladder is usually provided with a non-slip foot cover for protecting the foot pipe and preventing the ladder from sliding. The middle and upper part of the front ladder is usually provided with a top step for providing a place for the user to sit or step on a large area. The top of the front ladder is usually provided with a tool box for placing work accessories.

[0004] Due to the unique shape and structure of the front ladder, it often needs to go through metal surface treatment processes such as ladder pipe figure-eight feeding arrangement, drilling, punching, extruding and deforming, and needs to install a non-slip foot cover at the bottom of the two ladder pipes, a top step at the middle and upper part of the two ladder pipes, and a tool box at the top of the two ladder pipes. In production practice, these processes are usually completed by manual operation. Some automatic processing methods are used in individual processes, but multiple people are still needed for operations such as feeding and discharging, manual drilling and punching, extruding and deforming, pre-assembly of accessories such as horizontal rods and top steps, and installation of accessories such as non-slip foot covers, horizontal rods, top steps and tool boxes.

[0005] To further reduce costs and improve processing efficiency, an automatic processing equipment is designed to realize pre-installation of accessories, automatic figure-eight feeding arrangement of ladder pipes, automatic drilling and punching, automatic extruding and deforming, and automatic installation of various accessories. The equipment production line has simple structure, less manual participation, simple operation, high automation and high efficiency, and can maximize production efficiency.

[0006] Therefore, we propose a metal ladder front ladder assembly device to solve the problems mentioned above. SUMMARY

[0007] In order to overcome the deficiencies of the prior art, the purpose of the present application is to provide a metal ladder front ladder assembly device.

[0008] The purpose of the present application is achieved by the following technical scheme: a metal ladder front ladder assembly device, comprising,

[0009] The ladder pipe feeding mechanism is used to horizontally transfer the ladder pipe to the front of the horizontal drilling station, and then overturn the ladder pipe at the end of the conveying end from the horizontal state to the vertical state;

[0010] The horizontal drilling mechanism is used to clamp, horizontally transfer and clamp the ladder pipe in the vertical state in the ladder pipe limiting seat, and drill or / and punch the inside of the ladder pipe;

[0011] The foot sleeve installation mechanism is used to push the foot sleeve into the end of the ladder pipe, and then apply external force to the preset position of the ladder pipe to extrude and deform the local concave of the ladder pipe, so as to fix and limit the foot sleeve at the end of the ladder pipe;

[0012] The front ladder accessory shaping mechanism is used to respectively grab and tilt the two ladder pipes after installing the foot sleeve, and place them in the eight-shaped position of the front ladder limiting jig preset position, and then place the cross bar and top pedal between the two ladder pipes according to the preset position of the front ladder limiting jig, to complete the frame installation of the front ladder;

[0013] The vertical drilling mechanism is used to transfer the entire front ladder limiting jig to the vertical drilling station, lock the cross bar and top pedal on the ladder pipe, and complete the overall fixation of the front ladder frame.

[0014] Further, the ladder pipe feeding mechanism comprises an X-axis conveying device for horizontally conveying the ladder pipe, a turning device for turning the ladder pipe horizontally by 90°, and a first mechanical hand mechanism for transferring the ladder pipe from the feeding station to the drilling station, the turning device is arranged at the end of the conveying direction of the X-axis conveying device; the first mechanical hand mechanism is arranged above the X-axis conveying device;

[0015] When the ladder pipes are placed horizontally side by side on the X-axis conveying device, when the X-axis conveying device conveys the ladder pipes to the turning device, the turning device rotates to make the short side of the ladder pipe section face upward; the first mechanical hand mechanism transfers the ladder pipe from the feeding station to the drilling station.

[0016] Furthermore, the horizontal drilling mechanism includes a ladder tube limiting seat, a horizontal drilling and tapping device, a horizontal drilling device, and a clamping assembly; the horizontal drilling and tapping device and the horizontal drilling device are located on one side of the ladder tube limiting seat, and the clamping assembly is located on the other side of the ladder tube limiting seat; when the ladder tube is placed on the ladder tube limiting seat, the clamping assembly clamps the ladder tube within the ladder tube limiting seat, and the horizontal drilling and tapping device and the horizontal drilling device perform drilling and tapping or / and drilling at the preset drilling position of the ladder tube.

[0017] Furthermore, the foot cover installation mechanism includes a material box groove for conveying the foot cover, a reciprocating pusher for pushing the foot cover to the outlet of the material box groove, a power device for driving the reciprocating pusher to slide within the material box groove, a pushing component for pushing the foot cover out of the material box groove and into the bottom end of the ladder tube, and a compression deformation mechanism for applying external force to a preset position of the ladder tube to compress and deform it, thereby fixing and limiting the foot cover at the end of the ladder tube; the material box groove is provided with at least one outlet and one inlet, the reciprocating pusher is disposed within the material box groove, the power device is connected to the reciprocating pusher in a transmission connection, the pushing component is disposed on the outlet side of the material box groove, and the compression deformation mechanism is disposed on the ladder tube being processed;

[0018] When the foot cover enters the material box groove from the feed inlet, it is pushed to the discharge outlet by the reciprocating pusher. When the discharge outlet is detected to be in place, the pusher component extends and pushes the foot cover out of the material box groove and into the bottom end of the ladder tube. When the foot cover is installed at the bottom end of the ladder tube, the extrusion deformation mechanism moves to a preset position above the ladder tube and then extrudes downward. The ladder tube is partially concave and deformed at the preset position to fix and limit the foot cover at the bottom end of the ladder tube.

[0019] Furthermore, the extrusion deformation mechanism includes an extrusion block, an extrusion block Z-axis telescopic device that drives the extrusion block to extend and retract up and down along the Z-axis, and an extrusion block Y-axis sliding device that drives the extrusion block Z-axis telescopic device to move left and right along the Y-axis. The extrusion block is located above the foot cover mounting mechanism.

[0020] Furthermore, the front ladder component shaping mechanism includes a Y-axis transport device and a front ladder limiting fixture mounted on the Y-axis transport device; the front ladder limiting fixture includes a base plate, a first ladder tube limiting seat, a second ladder tube limiting seat, a crossbar limiting seat, a foot cover positioning seat, a tread limiting seat, and a locking element; the first ladder tube limiting seat and the second ladder tube limiting seat are arranged in a V-shape on the base plate, and the crossbar limiting seat and the tread limiting seat are located between the first ladder tube limiting seat and the second ladder tube limiting seat; the first ladder tube limiting seat is fixedly mounted on the base plate, and the second ladder tube limiting seat is movably mounted on the base plate at a position close to or far from the first ladder tube limiting seat; the ends of the first ladder tube limiting seat and the second ladder tube limiting seat are provided with foot cover positioning seats to limit the starting position of the bottom foot cover of the front ladder;

[0021] After the foot covers are installed, the ladder tubes are installed on the first ladder tube limiting seat and the second ladder tube limiting seat, arranged in a figure-eight shape. Then, the crossbar and the top step are installed between the two ladder tubes. Finally, the second ladder tube limiting seat is slid close to the first ladder tube limiting seat and the position of the second ladder tube limiting seat is fixed by the locking fastener, so that the front ladder is installed completely at the preset angle and position and is limited on the front ladder limiting fixture.

[0022] Furthermore, the vertical drilling and tapping mechanism includes a top clamping assembly, a side clamping assembly, at least one vertical drilling and tapping assembly, and a guide seat; the top clamping assembly and the side clamping assembly are respectively disposed on the top and sides of the front foot ladder limiting fixture, and the vertical drilling and tapping assembly is symmetrically installed above and below the front foot ladder limiting fixture via the guide seat; the top clamping assembly is driven by a power drive component one to move along the Z-axis direction, the side clamping assembly is driven by a power drive component two to move along the X-axis and Z-axis directions, and the vertical drilling and tapping assembly is driven by a power drive component three to move along the Y-axis and Z-axis directions.

[0023] Furthermore, the metal A-frame ladder front leg assembly device also includes a toolbox mounting mechanism, which includes a toolbox feeding device for conveying the toolbox, a third robotic arm for gripping the toolbox, a toolbox positioning fixture for fixing the position of the toolbox, a toolbox clamp for clamping the toolbox on the toolbox positioning fixture, a toolbox pushing device for pushing the toolbox to the top of the two ladder tubes, and a toolbox drilling and tapping device for locking the toolbox on the two ladder tubes; if it is necessary to adjust the direction of the toolbox, the toolbox mounting mechanism also includes a rotating fixture for adjusting the direction of the toolbox;

[0024] The third robotic arm is driven by a power drive unit to move along the X and Z axes, so that it transfers the loading device or rotating fixture onto the toolbox limiting fixture, and the toolbox gripper fixes it onto the toolbox limiting fixture. The toolbox pushing device is driven by a power drive unit to move along the Y and Z axes. At this time, after adjusting the height direction of the Z axis by the toolbox pushing device, the toolbox is transported along the Y axis until it is inserted into the top of the two ladder tubes. The toolbox drilling and tapping device is located at the top of the ladder tubes and the toolbox. The toolbox drilling and tapping device rotates downward along the Z axis and locks the toolbox onto the two ladder tubes with fasteners, thus completing the installation of the toolbox.

[0025] Furthermore, the metal A-frame ladder front leg assembly device also includes a crossbar pre-assembly mechanism, wherein the two ends of the crossbar are provided with concave connectors for quick installation, and the concave connectors are fixed to the two ends of the crossbar by the crossbar pre-assembly mechanism;

[0026] The crossbar pre-assembly mechanism includes a crossbar limiting fixture for fixing the crossbar, a crossbar pressing device for pressing the crossbar, a connector feeding device for conveying the concave connector, a connector limiting seat for limiting the position of the concave connector, an anti-disengagement device for preventing the concave connector from slipping off, and a connector pushing device for pushing and fixing the concave connector to both ends of the crossbar.

[0027] First, the crossbar is pressed and fixed on the crossbar limiting fixture. The connecting part feeding device conveys the concave connecting part to the connecting part limiting seat through the feeding chute. Then, the connecting part pushing device pushes the concave connecting part and fixes it to both ends of the crossbar, completing the pre-installation process of the crossbar.

[0028] Furthermore, the metal A-frame ladder front foot assembly device also includes a top tread tube-through and marking mechanism. The top tread is provided with a pivot tube for pivotally connecting between the two ladder tubes. The pivot tube is passed through the top tread tube-through and marking mechanism and is rotatably limited and installed on the top tread.

[0029] The top pedal tube-passing and marking mechanism includes a pedal limiting fixture, a guide groove, a rotating frame, a guiding device, and a pressing limiting device. The top pedal is placed and limited on the pedal limiting fixture, and the top pedal has a mounting hole for installing the pivot tube. The guide groove has a discharge port for a pivot tube to pass through and a guiding inclined surface that provides gravity power to the discharge port. The rotating frame is located on one side of the discharge port and is used to rotate and transport the pivot tube of the discharge port to a preset height of the mounting hole. The guiding device inserts the pivot tube on the rotating frame horizontally into the mounting hole of the top pedal and leaves tube openings of the same length on both sides of the top pedal. The pressing device presses down vertically to the tube openings on both sides of the top pedal to deform the tube openings and limit the range of motion of the top pedal on the pivot tube.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] 1. To further reduce costs and improve processing efficiency, an automated processing equipment has been designed. This equipment enables pre-installation of parts, automatic figure-eight feeding and arrangement of ladder tubes, automatic drilling and tapping, automatic extrusion deformation, and automated assembly of various parts. This production line features a simple structure, easy operation, high automation, and high efficiency, maximizing production benefits.

[0032] 2. Specifically, in this invention, two ladder tubes are arranged in a figure-eight shape on the front ladder limiting fixture, and other accessories such as crossbars and foot covers are also pre-installed on the front ladder limiting fixture. The front ladder limiting fixture is pre-set with each limiting seat of the accessories required for the front ladder A, which facilitates the implementation of subsequent drilling and fixing processes. Through the operation of various mechanisms on the production line of this invention, the above-mentioned accessories are pre-installed in position, pre-drilled, and extruded and deformed to realize the automated installation of scattered accessories and improve production efficiency.

[0033] 3. In this application, the material is conveyed horizontally side by side to the notch inside the rotating disc via a belt conveyor at the loading station. Then, the turning device rotates, and the horizontally lying ladder tube is turned at a certain angle to flip it into an upright state. On the one hand, this facilitates the gripping of the second robotic arm mechanism, and on the other hand, the direction of the ladder tube is pre-flipped to facilitate direct construction at the drilling station.

[0034] 4. According to the installation requirements of the crossbar and top tread, fastening holes or mounting holes are pre-drilled on the ladder tube. Specifically, several horizontal drilling and tapping devices and / or horizontal drilling devices are set in the middle of the mounting platform. In order to improve the adaptability of assembling different A-frame ladder products, the horizontal drilling and tapping devices and / or horizontal drilling devices of this invention can be equipped with multiple axial moving devices such as X-axis, Y-axis, Z-axis, etc. (not shown in the figure), which are used to drive the horizontal drilling and tapping devices and / or horizontal drilling devices to move to the required position for drilling, thereby improving the processing adaptability and efficiency of this workstation.

[0035] 5. Existing ladder legs typically require manual installation, involving repeated adjustments to the installation position. After installation, an additional manual pressing and shaping process is needed, resulting in extremely low assembly efficiency. Furthermore, the large length of the ladder tubes makes installation and transportation inconvenient, requiring larger processing spaces and hindering mass production. Therefore, this invention incorporates automated ladder leg assembly during the drilling process. This allows the entire ladder leg assembly to be completed before being transferred to the V-shaped front ladder assembly station. Specifically, it includes two steps: inserting the ladder legs and pressing and deforming the ladder tubes. These processing steps are entirely automated, requiring no manual intervention, significantly improving production efficiency and avoiding the tolerance errors inherent in manual assembly. In addition, this mechanism is located on the upper side of one side of the mounting platform, making efficient use of the space on both sides of the drilling station, improving site utilization and overall production and assembly efficiency.

[0036] 6. In order to further improve efficiency and make reasonable use of factory processing space, the present invention specifically improves the feeding efficiency of the foot cover by designing the material inlet and outlet positions in the material box slot in conjunction with the reciprocating pusher structure. At the same time, combined with the ladder tube flipping device, the overall installation time of the foot cover of a single A-frame ladder can be shortened, greatly reducing manpower and improving assembly efficiency.

[0037] 7. The present invention provides an angle adjustment device in the second robotic arm mechanism. After the gripping device picks up the ladder tube, it rotates it outward or inward by a certain preset angle. This angle adjustment is achieved and completed by setting the cylinder stroke and the pivotal relationship between the two mounting plates. The structure is simple and can realize bidirectional adjustment, realizing the automated assembly of the figure-eight ladder legs.

[0038] 8. This invention designs a Y-axis transport device. The figure-eight front leg ladder shaping station and the vertical drilling station share the same Y-axis transport device. The Y-axis transport device has two layers of conveyor belts. The front leg ladder limiting fixture is transported back and forth between the two layers of conveyor belts in a cyclic manner, realizing the cyclic installation of the figure-eight front leg ladder, improving the transport efficiency of the limiting fixture, and improving production efficiency.

[0039] 9. This application designs a toolbox installation mechanism to clamp and transfer the toolbox to a preset toolbox limiting fixture. The left and right pusher mechanisms on the toolbox limiting fixture clamp and fix the toolbox. The toolbox limiting fixture is pushed to the side of the front ladder limiting fixture that has completed the vertical drilling and tapping process, and the toolbox is inserted into the top of two ladder tubes arranged in a figure-eight shape. The toolbox is fixed to the top of the ladder tube by fasteners on the drilling and tapping device, thus completing the installation of the toolbox.

[0040] 10. This invention designs a crossbar pre-installation mechanism and a top pedal tube-through-pointing mechanism to complete the pre-installation of the crossbar, the connecting parts on the top pedal, and the pivot. The automation of the equipment solves this problem, freeing up manpower and improving production efficiency. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of a metal folding A-frame ladder in the prior art;

[0042] Figure 2 This is a schematic diagram of the front leg of the metal folding A-frame ladder of the present invention;

[0043] Figure 3 This is a schematic diagram of the structure of the metal A-frame ladder front leg assembly device according to a preferred embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of the structure of the ladder tube feeding mechanism, horizontal drilling mechanism, foot cover mounting mechanism, extrusion deformation mechanism, and second robotic arm mechanism in a preferred embodiment of the present invention.

[0045] Figure 5 This is a schematic diagram of the ladder tube feeding mechanism according to a preferred embodiment of the present invention;

[0046] Figure 6 for Figure 5 Enlarged view of point a in the middle;

[0047] Figure 7This is a schematic diagram of the structure of the horizontal drilling mechanism, the foot cover mounting mechanism, the extrusion deformation mechanism, and the second robotic arm mechanism in a preferred embodiment of the present invention;

[0048] Figure 8 This is an enlarged schematic diagram of the first robotic arm mechanism according to a preferred embodiment of the present invention;

[0049] Figure 9 for Figure 8 Enlarged view of point b in the middle;

[0050] Figure 10 This is an enlarged schematic diagram of the second robotic arm mechanism according to a preferred embodiment of the present invention;

[0051] Figure 11 This is a schematic diagram of the drilling mechanism and the foot sleeve installation mechanism according to a preferred embodiment of the present invention;

[0052] Figure 12 for Figure 11 Enlarged view of point c in the middle;

[0053] Figure 13 for Figure 12 Enlarged view of a portion of the image;

[0054] Figure 14 for Figure 13 Enlarged view of point d in the middle;

[0055] Figure 15 This is a schematic diagram of the drilling mechanism and foot cover mounting mechanism from another angle, representing a preferred embodiment of the present invention.

[0056] Figure 16 for Figure 15 Enlarged view of a portion of the image;

[0057] Figure 17 This is a schematic diagram of the structure of the front foot ladder limiting fixture according to a preferred embodiment of the present invention;

[0058] Figure 18 This is a schematic diagram of the vertical drilling mechanism according to a preferred embodiment of the present invention;

[0059] Figure 19 This is a schematic diagram of the toolbox mounting mechanism according to a preferred embodiment of the present invention;

[0060] Figure 20 This is a schematic diagram of the missing drill tapping device of the tool box mounting mechanism according to a preferred embodiment of the present invention;

[0061] Figure 21 for Figure 20 Enlarged view of point e in the middle;

[0062] Figure 22 This is a schematic diagram of the toolbox drilling and tapping device and the toolbox gripper according to a preferred embodiment of the present invention;

[0063] Figure 23 This is a schematic diagram of the crossbar structure according to a preferred embodiment of the present invention;

[0064] Figure 24 This is a schematic diagram of the crossbar pre-assembly mechanism according to a preferred embodiment of the present invention;

[0065] Figure 25 for Figure 24 Enlarged view of point f in the middle;

[0066] Figure 26 This is a schematic diagram of the structure of the top pedal tube-through-marking mechanism according to a preferred embodiment of the present invention;

[0067] Figure 27 This is a schematic diagram of the top pedal tube-through-marking mechanism of a preferred embodiment of the present invention from another angle;

[0068] In the diagram: 1. Ladder tube feeding mechanism; 11. X-axis conveying device; 12. Steering device; 121. Rotating disk; 122. Notch; 13. First robotic arm mechanism; 131. First gripper device; 132. First gripper Z-axis lifting device; 133. First gripper Y-axis moving device;

[0069] 2. Horizontal drilling mechanism; 21. Ladder tube limit seat; 22. Horizontal drilling and tapping device; 23. Horizontal drilling device; 24. Clamping assembly; 241. Clamping block; 242. Spinning device;

[0070] 3. Foot cover installation mechanism; 31. Material box trough; 311. Discharge port; 312. Inlet port; 32. Reciprocating pusher; 33. Power unit; 34. Pushing assembly; 35. Ladder tube flipping device; 351. Rotating arm; 352. Movable gripper; 353. Rotating arm Z-axis lifting device;

[0071] 4. Extrusion deformation mechanism; 41. Extrusion block; 42. Extrusion block Z-axis telescopic device; 43. Extrusion block Y-axis sliding device;

[0072] 5. Second robotic arm mechanism; 51. Second gripper device; 52. Second gripper Z-axis lifting device; 53. Second gripper Y-axis moving device; 54. Angle adjustment device; 541. First mounting plate; 542. Second mounting plate; 543. Adjusting cylinder; 544. Pivot; 55. Position sensor;

[0073] 6. Front step ladder limiting fixture; 61. Base plate; 62. First ladder tube limiting seat; 63. Second ladder tube limiting seat; 64. Crossbar limiting seat; 65. Foot cover positioning seat; 66. Step limiting seat; 67. Locking fastener;

[0074] 7. Vertical drilling and tapping mechanism; 71. Side clamping assembly; 72. Vertical drilling and tapping assembly; 73. Guide seat;

[0075] 8. Toolbox mounting mechanism; 81. Toolbox feeding device; 82. Third robotic arm; 83. Toolbox limiting fixture; 84. Toolbox gripper; 85. Toolbox pushing device; 86. Toolbox drilling and tapping device; 87. Rotary tooling;

[0076] 9. Crossbar pre-assembly mechanism; 91. Crossbar limiting fixture; 92. Crossbar clamping device; 93. Connector feeding device; 94. Connector limiting seat; 95. Anti-displacement device; 96. Connector pushing device;

[0077] 10. Top pedal tube insertion and marking mechanism; 101. Pedal limiting fixture; 102. Guide chute; 103. Rotating frame; 104. Guiding device; 105. Downward limiting device;

[0078] 111. Y-axis transport device;

[0079] A. Front ladder; A1. Ladder tube; A2. Horizontal bar; A21. Concave connector; A3. Foot cover; A4. Top step; A5. Tool box; B. Rear ladder. Detailed Implementation

[0080] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0081] like Figure 1 As shown, the metal folding A-frame ladder referred to in this technology includes a front ladder A and a rear ladder B movably connected to the front ladder A. The front ladder A and the rear ladder B can typically switch between an unfolded and a folded state to meet people's usage needs at different times. Figure 2 As shown, the front ladder A of this invention refers to a climbable structure that connects and supports several steps between two ladder tubes, and is the core component of a metal A-frame ladder. The two ladder tubes A1 are arranged in a V-shape, serving as the side support parts of the front ladder. The steps refer to the crossbars A2 on the front ladder A used for stepping, and are typically composed of multiple crossbars of varying lengths that gradually narrow. The bottom of the front ladder A is usually equipped with foot covers A3 to protect the foot tubes and prevent the ladder from slipping. The upper part of the front ladder A is usually equipped with a top step A4, and the top of the front ladder A is usually equipped with a tool box A5 for storing work accessories.

[0082] The metal A-frame ladder front leg assembly device of this invention is the core processing device for the front leg A of the metal A-frame ladder. The main components and structure of the front leg A are pre-assembled through the production line of this invention, which facilitates the subsequent assembly of the rear leg ladder and avoids excessive tolerances or low efficiency caused by manual assembly of all components.

[0083] like Figures 3-27 As shown, a metal A-frame ladder front leg assembly device is used for assembly. The metal A-frame ladder front leg assembly device is provided with a crossbar pre-installation station, a tread tube insertion and marking pre-installation station, a ladder tube loading station, a horizontal drilling station, a foot cover installation station, an eight-shaped front leg shaping station, a vertical drilling station, and a tool box installation station.

[0084] The figure-eight front ladder shaping station and the vertical drilling station share a Y-axis transport device. The Y-axis transport device has two conveyor belts, which circulate and transfer the front ladder limit fixture between the two conveyor belts to realize the cyclic installation of the figure-eight front ladder, improve the transfer efficiency of the limit fixture, and improve production efficiency.

[0085] The present invention provides a metal A-frame ladder front leg assembly device, comprising at least:

[0086] The ladder tube feeding mechanism is used to horizontally transfer the ladder tube to the horizontal drilling station, and then flip the ladder tube at the end of the conveyor from the horizontal state to the vertical state.

[0087] A horizontal drilling mechanism is used to clamp, horizontally transfer, and clamp the vertical ladder tube into the ladder tube limiting seat, and to drill and / or punch holes in the inner side of the ladder tube.

[0088] The foot cover installation mechanism is used to push the foot cover into the end of the ladder tube, and then apply external force to the preset position of the ladder tube to squeeze it, causing the ladder tube to be locally concave and deformed, so as to fix and limit the foot cover at the end of the ladder tube.

[0089] The front ladder accessory shaping mechanism is used to grab and tilt the two ladder tubes after the foot covers are installed, and place them in a figure-eight shape at the preset position of the front ladder limit fixture. The crossbar and top step are placed between the two ladder tubes according to the preset position of the front ladder limit fixture to complete the frame installation of the front ladder.

[0090] The vertical drilling and tapping mechanism is used to transfer the entire front ladder limiting fixture to the vertical drilling and tapping station, lock the crossbar and top step onto the ladder tube, and complete the overall fixation of the front ladder frame.

[0091] The horizontal drilling mechanism, foot cover installation mechanism, and front ladder accessory shaping mechanism share a second robotic arm mechanism, which is used to grab, transfer, and turn the ladder tube A1 according to the needs of each workstation.

[0092] This invention arranges two ladder tubes A1 in a figure-eight shape on the front ladder limiting fixture 6, and simultaneously pre-installs other accessories such as crossbars A2, foot covers A3, top pedals A4, and tool boxes A5 on the front ladder limiting fixture 6. The front ladder limiting fixture 6 is pre-set with various limiting seats for the accessories required for the front ladder A, which facilitates the implementation of subsequent drilling and fixing processes. Through the operation of various mechanisms on the production line of this invention, the above-mentioned accessories complete the pre-installation of positions, pre-drilling, and extrusion deformation to realize the automated installation of scattered accessories and improve production efficiency.

[0093] In this embodiment, the ladder tube loading mechanism 1 includes an X-axis conveying device 11 for horizontally conveying the ladder tube A1, a turning device 12 for turning the ladder tube A1 horizontally by 90°, and a first robotic arm mechanism 13 for transferring the ladder tube A1 from the loading station to the drilling station. The turning device 12 is located at the end of the X-axis conveying device 11 in the conveying direction; the first robotic arm mechanism is located above the X-axis conveying device.

[0094] When the ladder tube A1 is placed horizontally side by side on the X-axis conveying device 11, and the X-axis conveying device 11 conveys the ladder tube A1 to the turning device 12, the turning device 12 rotates so that the short side of the cross section of the ladder tube A1 faces upward; the first robotic arm mechanism 13 transfers the ladder tube A1 from the loading station to the drilling station.

[0095] As a further preferred embodiment, the steering device 12 is provided with a rotating disk 121. The periphery of the rotating disk 121 is provided with a plurality of notches 122 for accommodating the ladder tube A1. When the ladder tube is pushed into the notch 122 by the X-axis conveying device 11, the rotating disk 121 is driven to rotate by the power device, thereby flipping the ladder tube A1 from a horizontal state to an upright state. The power device includes, but is not limited to, existing transmission devices such as motors and belt drives.

[0096] The first robotic arm mechanism 13 includes a first gripper device 131, a first gripper Z-axis lifting device 132 that drives the gripper device to move along the Z-axis direction, and a first gripper Y-axis moving device 133 that drives the gripper Z-axis lifting device to move left and right along the Y-axis direction.

[0097] In this application, the material is conveyed horizontally side by side to the notch 122 inside the rotating disc 121 via a belt conveyor at the loading station. Then, the turning device 12 rotates, and the horizontally lying ladder tube A1 is turned at a certain angle to flip it into an upright state. On the one hand, this facilitates the gripping of the first robotic arm mechanism 13, and on the other hand, it pre-flips the direction of the ladder tube A1 to facilitate direct construction at the drilling station.

[0098] As a further preferred embodiment, the horizontal drilling mechanism 2 includes a ladder tube limiting seat 21, a horizontal drilling and tapping device 22, a horizontal drilling device 23, and a clamping assembly 24; the horizontal drilling and tapping device 22 and the horizontal drilling device 23 are located on one side of the ladder tube limiting seat 21, and the clamping assembly 24 is located on the other side of the ladder tube limiting seat 21. When the horizontal drilling mechanism 2 detects that the ladder tube A1 is placed on the ladder tube limiting seat 21, the clamping assembly 24 clamps the ladder tube A1 in the ladder tube limiting seat 21, and the horizontal drilling and tapping device 22 and the horizontal drilling device 23 perform drilling and tapping or / and drilling at the preset drilling position of the ladder tube A1;

[0099] The clamping assembly 24 includes a clamping block 241 and a spinning device 242 that is pulsatingly connected to the clamping block 241. The spinning device 242 drives the clamping block 241 to switch between a clamping state and a loosened state away from the ladder tube.

[0100] According to the installation requirements of the crossbar A2 and the top step A4, fastening holes or mounting holes are pre-drilled on the ladder tube A1. Specifically, several horizontal drilling and tapping devices 22 and / or horizontal drilling devices 23 are set in the middle of the mounting platform. In order to improve the adaptability of assembling different products of the A-frame ladder, the horizontal drilling and tapping devices 22 and / or horizontal drilling devices 23 of the present invention can be equipped with multiple axial moving devices such as X-axis, Y-axis, Z-axis, etc. (not shown in the figure), which are used to drive the horizontal drilling and tapping devices 22 and / or horizontal drilling devices 23 to move to the required position for drilling, thereby improving the processing adaptability and efficiency of this workstation.

[0101] As a further preferred embodiment, the foot cover installation mechanism 3 includes a material box groove 31 for conveying the foot cover A3, a reciprocating pusher 32 for pushing the foot cover A3 to the outlet of the material box groove 31, a power device 33 for driving the reciprocating pusher 32 to slide within the material box groove 31, a pushing component 34 for pushing the foot cover A3 out of the material box groove 31 and into the bottom end of the ladder tube A1, and a compression deformation mechanism 4 for applying external force to the ladder tube at a preset position to compress and deform it, thereby fixing and limiting the foot cover at the end of the ladder tube; the material box groove 31 is provided with at least one outlet 311 and an inlet 312, the reciprocating pusher is disposed within the material box groove, the power device is connected to the reciprocating pusher in a transmission manner, the pushing component is disposed on the outlet side of the material box groove, and the compression deformation mechanism is disposed on the ladder tube being processed;

[0102] Specifically, the extrusion deformation mechanism 4 includes an extrusion block 41, an extrusion block Z-axis telescopic device 42 that drives the extrusion block 41 to extend and retract up and down along the Z-axis, and an extrusion block Y-axis sliding device 43 that drives the extrusion block Z-axis telescopic device 42 to move left and right along the Y-axis. The extrusion block 41 is located above the foot cover mounting mechanism 3.

[0103] When the foot sleeve A3 enters the material box groove 31 from the feed port 312, it is pushed to the discharge port 311 by the reciprocating pusher 32. When the discharge port 311 is detected to be in place with the ladder tube A1, the pusher assembly 34 extends and pushes the foot sleeve A3 out of the material box groove 31 and pushes it into the bottom end of the ladder tube A1. When the foot sleeve A3 is installed at the bottom end of the ladder tube A1, the extrusion block 41 is moved to a preset position above the ladder tube A1 by the extrusion block Y-axis sliding device 43, and then driven by the extrusion block Z-axis telescopic device 42 to extrude downward. The ladder tube A1 is partially concave and deformed at the preset position to fix and limit the foot sleeve at the bottom end of the ladder tube A1.

[0104] Existing foot covers (A3) typically require manual installation, involving repeated adjustments to the installation position, and an additional manual pressing and shaping process after installation. This results in extremely low assembly efficiency. Furthermore, the long length of the ladder tube (A1) makes installation and transportation inconvenient, requiring a larger processing area and hindering mass production. Therefore, this invention incorporates automated assembly of the foot covers (A3) during the drilling process. This allows the entire foot cover (A3) to be assembled before being transferred to the figure-eight front ladder assembly station. Specifically, this includes two steps: inserting the foot cover (A3) and pressing and deforming the ladder tube (A1). These processing steps are entirely automated, requiring no manual intervention, significantly improving production efficiency and avoiding the tolerance errors inherent in manual assembly. In addition, this mechanism is located on the upper side of one side of the mounting platform, making efficient use of the space on both sides of the drilling station, improving site utilization and overall production and assembly efficiency.

[0105] In this embodiment, the foot cover installation mechanism 3 further includes a ladder tube flipping device 35, which is disposed between the two ladder tube limiting seats 21. It is used to remove the ladder tube A1 that has completed the drilling process in the ladder tube limiting seat 21 and flip it into the other ladder tube limiting seat 21 to wait for the foot cover installation process. Specifically, the ladder tube flipping device 35 includes a rotating arm 351, a movable gripper 352 installed at the end of the rotating arm 351, and a rotating arm Z-axis lifting device 353 that drives the rotating arm 351 to move up and down along the Z-axis.

[0106] To further improve efficiency and make better use of factory processing space, this invention specifically improves the feeding efficiency of the foot cover A3 by designing the material inlet and outlet positions in the material box groove 31 in conjunction with the reciprocating pusher 32 structure. At the same time, combined with the ladder tube flipping device 35, the overall installation time of the foot cover of a single A-frame ladder can be shortened, greatly reducing manpower and improving assembly efficiency.

[0107] As a further preferred embodiment, the front step ladder component shaping mechanism includes a Y-axis transport device 11 and a front step ladder limiting fixture 6 disposed on the Y-axis transport device; the front step ladder limiting fixture 6 includes a base plate 61, a first ladder tube limiting seat 62, a second ladder tube limiting seat 63, a crossbar limiting seat 64, a foot cover positioning seat 65, a pedal limiting seat 66, and a locking fastener 67.

[0108] The first ladder tube limiting seat 62 and the second ladder tube limiting seat 63 are arranged in a figure-eight shape on the base plate 61. The crossbar limiting seat 64 and the step limiting seat 66 are located between the first ladder tube limiting seat 62 and the second ladder tube limiting seat 63. The first ladder tube limiting seat 62 is fixedly installed on the base plate 61, and the second ladder tube limiting seat 63 is movably installed on the base plate 61 at a position close to or far from the first ladder tube limiting seat 62. The ends of the first ladder tube limiting seat 62 and the second ladder tube limiting seat 63 are provided with foot cover positioning seats 65, which are used to limit the starting position of the foot cover A3 at the bottom of the front ladder.

[0109] After the foot covers A3 are installed, the ladder tube A1 is automatically installed on the first ladder tube limiting seat 62 and the second ladder tube limiting seat 63 by the second robotic arm mechanism 5, arranged in a figure-eight shape. Then, accessories such as the crossbar A2 and the top step A4 are installed between the two ladder tubes A1 by manual means. The crossbar A2 has a U-shaped opening at each end for locking onto the ladder tubes A1 at both ends. Then, the second ladder tube limiting seat 63 is slid close to the first ladder tube limiting seat 62 and the position of the second ladder tube limiting seat 63 is fixed by the locking device, so that the front ladder A is installed completely according to the preset angle and position and limited on the front ladder limiting fixture 6, which facilitates the subsequent vertical drilling and tapping process. That is, the crossbar A2 and the ladder tube A1 are drilled and locked by the existing vertical drilling and tapping mechanism 7, realizing the transformation of the cumbersome fastener positioning process into a simple direct drilling and tapping process.

[0110] In this embodiment, specifically, the second robotic arm mechanism 5 includes a second gripper device 51, a second gripper Z-axis lifting device 52 that drives the second gripper device 51 to move along the Z-axis direction, a second gripper Y-axis moving device 53 that drives the second gripper Z-axis lifting device 52 to move left and right along the Y-axis direction, and an angle adjustment device 54 for adjusting the gripper device to a preset angle.

[0111] The angle adjustment device 54 includes a first mounting plate 541, a second mounting plate 542, and an adjusting cylinder 543. The first mounting plate 541 is pivotally connected to the second mounting plate 542 via a pivot 544. One end of the first mounting plate 541 away from the pivot 544 is fixed to the gripper device, and one end of the second mounting plate 542 away from the pivot 544 is fixed to the gripper Z-axis lifting device. The adjusting cylinder 543 is located on the side away from the pivot 544. One end of the adjusting cylinder 543 is pivotally connected to the gripper device, and the other end of the adjusting cylinder 543 is pivotally connected to the gripper Z-axis lifting device.

[0112] The present invention incorporates an angle adjustment device 54 in the robotic arm mechanism. When the gripper picks up the ladder tube A1, it rotates it outward or inward by a certain preset angle. This angle adjustment is achieved and completed by setting the cylinder stroke and the pivotal relationship between the two mounting plates. This structure is simple, enables bidirectional adjustment, and realizes the automated assembly of the figure-eight ladder legs.

[0113] In a preferred embodiment, to achieve high-precision automated control of the second robotic arm mechanism 5, the gripper Z-axis lifting device is equipped with several vertically arranged position sensors 55. These vertically arranged position sensors 55 provide height position control, enabling high-precision alignment, gripping, and transfer operations.

[0114] As a further preferred option, in the vertical drilling and tapping process, the Y-axis transport device 111 transfers the entire front foot ladder limiting fixture 6 to the vertical drilling and tapping station. At this time, the ladder tube A1 located on the front foot ladder limiting fixture 6 is distributed in a figure-eight shape. The crossbar A2 and the top step A4 are locked onto the ladder tube A1 by the vertical drilling and tapping mechanism 7, thus completing the overall fixation of the front foot ladder A frame.

[0115] Specifically, two vertical drilling and tapping mechanisms 7 form a group, and at least one group of vertical drilling and tapping mechanisms 7 is provided on the Y-axis transport device 111. In order to improve the vertical drilling and tapping efficiency of this production line, this preferred embodiment provides three groups of vertical drilling and tapping mechanisms 7. Each group of vertical drilling and tapping mechanisms 7 is respectively set on both sides of a front foot ladder limiting fixture 6. Each vertical drilling and tapping mechanism 7 includes a top clamping assembly (not shown in the figure), a side clamping assembly 71, at least one vertical drilling and tapping assembly 72, and a guide seat 73. The top clamping assembly and the side clamping assembly 71 are respectively set on the top and both sides of the front foot ladder limiting fixture. The vertical drilling and tapping assembly 72 is symmetrically installed above and below the front foot ladder limiting fixture through the guide seat 73. The top clamping assembly is driven by a power drive component one to move along the Z-axis direction, the side clamping assembly is driven by a power drive component two to move along the X-axis and Z-axis directions, and the vertical drilling and tapping assembly is driven by a power drive component three to move along the Y-axis and Z-axis directions. In order to match the angle of the ladder tubes A1 distributed in a figure-eight shape on the front ladder limit fixture 6, the guide seat 73 is designed to be distributed in a figure-eight shape. The vertical drilling and tapping components 72 are respectively installed on the guide seat 73, which greatly improves the efficiency of the vertical drilling and tapping process and eliminates the need for steering adjustments.

[0116] As a further preferred embodiment, the metal A-frame ladder front leg assembly device also includes a toolbox mounting mechanism. Specifically, the toolbox mounting mechanism 8 includes a toolbox loading device 81 for conveying the toolbox A5, a third robotic arm 82 for gripping the toolbox A5, a toolbox limiting fixture 83 for fixing the position of the toolbox A5, a toolbox gripper 84 for clamping the toolbox A5 onto the toolbox limiting fixture 83, a toolbox pushing device 85 for pushing the toolbox A5 to the top of the two ladder tubes A1, and a toolbox drilling and tapping device 86 for locking the toolbox A5 onto the two ladder tubes A1. If it is necessary to adjust the direction of the toolbox A5, the toolbox mounting mechanism 8 also includes a rotating fixture 87 for adjusting the direction of the toolbox A5. The third robotic arm 82 is driven by the power drive component four to move along the X and Z axes, so that it transfers the material from the loading device or rotating fixture 87 to the tool box limiting fixture 83, and is fixed on the tool box limiting fixture 83 by the tool box gripper 84; the tool box pushing device 85 is driven by the power drive component five to move along the Y and Z axes. At this time, after adjusting the height direction of the Z axis by the tool box pushing device 85, the tool box A5 is conveyed along the Y axis until it is inserted into the top of the two ladder tubes A1. In order to further fix the position of the tool box A5, the tool box drilling and tapping device 86 is located at the top of the ladder tubes A1 and the tool box A5. The tool box drilling and tapping device 86 rotates downward along the Z axis and locks the tool box A5 on the two ladder tubes A1 by fasteners, thus completing the installation of the tool box A5.

[0117] The toolbox installation process is as follows: The toolbox A5 is clamped and transferred to the preset toolbox limiting fixture 83 by the toolbox installation mechanism 8. The left and right pusher mechanisms on the toolbox limiting fixture 83 clamp and fix the toolbox A5. The toolbox limiting fixture 83 is pushed to the side of the front ladder limiting fixture 6 that has completed the vertical drilling and tapping process, and the toolbox A5 is inserted into the top of the two figure-eight arranged ladder tubes A1. The toolbox A5 is fixed to the top of the ladder tubes A1 by the fasteners on the drilling and tapping device, thus completing the installation of the toolbox A5.

[0118] As a further preferred embodiment, the metal A-frame ladder front foot assembly device also includes a crossbar pre-assembly mechanism. The two ends of the crossbar A2 are provided with concave connectors A21 for quick installation. The concave connectors are fixed to the two ends of the crossbar A2 by the crossbar pre-assembly mechanism 9.

[0119] Specifically, the crossbar pre-assembly mechanism 9 includes a crossbar limiting fixture 91 for fixing the crossbar A2, a crossbar pressing device 92 for pressing the crossbar A2, a connector feeding device 93 for conveying the concave connector A21, a connector limiting seat 94 for limiting the position of the concave connector A21, an anti-displacement device 95 for preventing the concave connector A21 from slipping, and a connector pushing device 96 for pushing and fixing the concave connector A21 to both ends of the crossbar.

[0120] First, the crossbar A2 is pressed and fixed on the crossbar limiting fixture 91. The connecting part feeding device 93 conveys the concave connecting part A21 to the connecting part limiting seat 94 through the feeding groove. Then, the connecting part pushing device 96 pushes the concave connecting part A21 and fixes it to both ends of the crossbar A2, completing the pre-installation process of the crossbar A2.

[0121] As a further preferred embodiment, the metal A-frame ladder front foot assembly device also includes a top tread tube insertion and marking mechanism. The top tread A4 is provided with a pivot tube for pivotally connecting between the two ladder tubes A1. The pivot tube is inserted into the top tread A4 by the top tread tube insertion and marking mechanism 10 and is rotatably limited and installed on the top tread A4.

[0122] The top pedal tube-passing and marking mechanism 10 includes a pedal limiting fixture 101, a guide groove 102, a rotating frame 103, a guide device 104, and a pressing limiting device 105. The top pedal A4 is placed and limited on the pedal limiting fixture 101, and the top pedal A4 has a mounting hole for installing the pivot tube. The guide groove 102 has a discharge port for a pivot tube to pass through and a guide slope for providing gravity power to the discharge port. The rotating frame 103 is located on one side of the discharge port and is used to rotate and transport the pivot tube of the discharge port to a preset height of the mounting hole. The guide device 104 inserts the pivot tube on the rotating frame 103 horizontally into the mounting hole of the top pedal A4 and leaves tube openings of the same length on both sides of the top pedal A4. The pressing device presses down vertically to the tube openings on both sides of the top pedal A4 to deform the tube openings and limit the range of motion of the top pedal A4 on the pivot tube.

[0123] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A metal A-frame ladder front leg assembly device, characterized in that, include The ladder tube feeding mechanism is used to horizontally transfer the ladder tube to the horizontal drilling station, and then flip the ladder tube at the end of the conveyor from the horizontal state to the vertical state. A horizontal drilling mechanism is used to clamp, horizontally transfer, and clamp the vertical ladder tube into the ladder tube limiting seat, and to drill and / or punch holes in the inner side of the ladder tube. The foot cover installation mechanism is used to push the foot cover into the end of the ladder tube, and then apply external force to the preset position of the ladder tube to squeeze it, causing the ladder tube to be locally concave and deformed, so as to fix and limit the foot cover at the end of the ladder tube. The front ladder fitting shaping mechanism is used to grab and tilt the two ladder tubes after the foot covers are installed, and place them in a figure-eight shape on the preset position of the front ladder limit fixture. Then, the crossbar and top step are placed between the two ladder tubes according to the preset position of the front ladder limit fixture to complete the frame installation of the front ladder. The vertical drilling and tapping mechanism is used to transfer the entire front ladder limiting fixture to the vertical drilling and tapping station, lock the crossbar and top step onto the ladder tube, and complete the overall fixation of the front ladder frame.

2. The metal A-frame ladder front leg assembly device as described in claim 1, characterized in that, The ladder tube loading mechanism includes an X-axis conveying device for horizontally conveying ladder tubes, a turning device for turning the ladder tubes horizontally by 90°, and a first robotic arm mechanism for transferring the ladder tubes from the loading station to the drilling station. The turning device is located at the end of the conveying direction of the X-axis conveying device; the first robotic arm mechanism is located above the X-axis conveying device. When the ladder tubes are placed side by side in a horizontal direction on the X-axis conveying device, and the X-axis conveying device transports the ladder tubes to the turning device, the turning device rotates so that the short side of the ladder tube cross-section faces upward; the first robotic arm mechanism transfers the ladder tubes from the loading station to the drilling station.

3. The metal A-frame ladder front leg assembly device as described in claim 1, characterized in that, The horizontal drilling mechanism includes a ladder tube limiting seat, a horizontal drilling and tapping device, a horizontal drilling device, and a clamping assembly; the horizontal drilling and tapping device and the horizontal drilling device are located on one side of the ladder tube limiting seat, and the clamping assembly is located on the other side of the ladder tube limiting seat; when the ladder tube is placed on the ladder tube limiting seat, the clamping assembly clamps the ladder tube within the ladder tube limiting seat, and the horizontal drilling and tapping device and the horizontal drilling device perform drilling and / or drilling at the preset drilling position of the ladder tube.

4. The metal A-frame ladder front leg assembly device as described in claim 1, characterized in that, The foot cover installation mechanism includes a material box groove for conveying the foot cover, a reciprocating pusher for pushing the foot cover to the outlet of the material box groove, a power device for driving the reciprocating pusher to slide within the material box groove, a pushing component for pushing the foot cover out of the material box groove and into the bottom end of the ladder tube, and a compression deformation mechanism for applying external force to a preset position of the ladder tube to compress and deform it, thereby fixing and limiting the foot cover at the end of the ladder tube; the material box groove is provided with at least one outlet and one inlet, the reciprocating pusher is disposed within the material box groove, the power device is connected to the reciprocating pusher in a transmission connection, the pushing component is disposed on one side of the outlet of the material box groove, and the compression deformation mechanism is disposed on the ladder tube being processed; When the foot cover enters the material box groove from the feed inlet, it is pushed to the discharge outlet by the reciprocating pusher. When the discharge outlet is detected to be in place, the pusher component extends and pushes the foot cover out of the material box groove and into the bottom end of the ladder tube. When the foot cover is installed at the bottom end of the ladder tube, the extrusion deformation mechanism moves to a preset position above the ladder tube and then extrudes downward. The ladder tube is partially concave and deformed at the preset position to fix and limit the foot cover at the bottom end of the ladder tube.

5. The metal A-frame ladder front leg assembly device as described in claim 4, characterized in that, The extrusion deformation mechanism includes an extrusion block, an extrusion block Z-axis telescopic device that drives the extrusion block to extend and retract up and down along the Z-axis, and an extrusion block Y-axis sliding device that drives the extrusion block Z-axis telescopic device to move left and right along the Y-axis. The extrusion block is located above the foot cover mounting mechanism.

6. The metal A-frame ladder front leg assembly device as described in claim 1, characterized in that, The front ladder component shaping mechanism includes a Y-axis transport device and a front ladder limiting fixture mounted on the Y-axis transport device. The front ladder limiting fixture includes a base plate, a first ladder tube limiting seat, a second ladder tube limiting seat, a crossbar limiting seat, a foot cover positioning seat, a tread limiting seat, and a locking element. The first and second ladder tube limiting seats are arranged in a V-shape on the base plate, and the crossbar limiting seat and tread limiting seat are located between the first and second ladder tube limiting seats. The first ladder tube limiting seat is fixedly mounted on the base plate, and the second ladder tube limiting seat is movably mounted on the base plate at a position close to or far from the first ladder tube limiting seat. The ends of the first and second ladder tube limiting seats are provided with foot cover positioning seats to limit the starting position of the bottom foot cover of the front ladder. After the foot covers are installed, the ladder tubes are installed on the first ladder tube limiting seat and the second ladder tube limiting seat, arranged in a figure-eight shape. Then, the crossbar and the top step are installed between the two ladder tubes. Finally, the second ladder tube limiting seat is slid close to the first ladder tube limiting seat and the position of the second ladder tube limiting seat is fixed by the locking fastener, so that the front ladder is installed completely at the preset angle and position and is limited on the front ladder limiting fixture.

7. The metal A-frame ladder front leg assembly device as described in claim 1, characterized in that, The vertical drilling and tapping mechanism includes a top clamping assembly, a side clamping assembly, at least one vertical drilling and tapping assembly, and a guide seat. The top clamping assembly and the side clamping assembly are respectively disposed on the top and sides of the front step ladder limiting fixture. The vertical drilling and tapping assembly is symmetrically installed above and below the front step ladder limiting fixture via the guide seat. The top clamping assembly is driven by a power drive component one to move along the Z-axis direction, the side clamping assembly is driven by a power drive component two to move along the X-axis and Z-axis directions, and the vertical drilling and tapping assembly is driven by a power drive component three to move along the Y-axis and Z-axis directions.

8. The metal A-frame ladder front leg assembly device as described in claim 7, characterized in that, The metal A-frame ladder front leg assembly device also includes a toolbox mounting mechanism, which includes a toolbox feeding device for conveying the toolbox, a third robotic arm for gripping the toolbox, a toolbox positioning fixture for fixing the toolbox position, a toolbox clamp for clamping the toolbox on the toolbox positioning fixture, a toolbox pushing device for pushing the toolbox to the top of the two ladder tubes, and a toolbox drilling and tapping device for locking the toolbox on the two ladder tubes; if it is necessary to adjust the direction of the toolbox, the toolbox mounting mechanism also includes a rotating fixture for adjusting the direction of the toolbox; The third robotic arm is driven by a power drive unit to move along the X and Z axes, so that it transfers the loading device or rotating fixture onto the toolbox limiting fixture, and the toolbox gripper fixes it onto the toolbox limiting fixture. The toolbox pushing device is driven by a power drive unit to move along the Y and Z axes. At this time, after adjusting the height direction of the Z axis by the toolbox pushing device, the toolbox is transported along the Y axis until it is inserted into the top of the two ladder tubes. The toolbox drilling and tapping device is located at the top of the ladder tubes and the toolbox. The toolbox drilling and tapping device rotates downward along the Z axis and locks the toolbox onto the two ladder tubes with fasteners, thus completing the installation of the toolbox.

9. The metal A-frame ladder front leg assembly device as described in claim 1, characterized in that, The metal A-frame ladder front leg assembly device also includes a crossbar pre-assembly mechanism. The two ends of the crossbar are provided with concave connectors for quick installation. The concave connectors are fixed to the two ends of the crossbar by the crossbar pre-assembly mechanism. The crossbar pre-assembly mechanism includes a crossbar limiting fixture for fixing the crossbar, a crossbar pressing device for pressing the crossbar, a connector feeding device for conveying the concave connector, a connector limiting seat for limiting the position of the concave connector, an anti-disengagement device for preventing the concave connector from slipping off, and a connector pushing device for pushing and fixing the concave connector to both ends of the crossbar. First, the crossbar is pressed and fixed on the crossbar limiting fixture. The connecting part feeding device conveys the concave connecting part to the connecting part limiting seat through the feeding chute. Then, the connecting part pushing device pushes the concave connecting part and fixes it to both ends of the crossbar, completing the pre-installation process of the crossbar.

10. The metal A-frame ladder front leg assembly device as described in claim 1, characterized in that, The metal A-frame ladder front foot assembly device also includes a top tread tube-through and marking mechanism. The top tread is provided with a pivot tube for pivotally connecting between the two ladder tubes. The pivot tube is passed through the top tread tube-through and marking mechanism and is rotatably limited and installed on the top tread. The top pedal tube-passing and marking mechanism includes a pedal limiting fixture, a guide trough, a rotating frame, a guiding device, and a downward limiting device. The top pedal is positioned and limited on the pedal limiting fixture, and the top pedal has a mounting hole for installing the pivot tube. The guide trough has a discharge port for a pivot tube to pass through and a guide ramp that provides gravity power to the discharge port. The rotating frame is located on one side of the discharge port and is used to rotate and transport the pivot tube of the discharge port to a preset height of the mounting hole. The guiding device inserts the pivot tube on the rotating frame horizontally into the mounting hole of the top pedal, and leaves tube openings of the same length on both sides of the top pedal. The downward limiting device presses down vertically to the tube openings on both sides of the top pedal to deform the tube openings and limit the range of motion of the top pedal on the pivot tube.

Images