Automatic feeding, drilling and extrusion deformation production line for metal ladder pipes

Abstract

The invention discloses an automatic feeding, drilling and extrusion deformation production line for metal ladder pipes, and belongs to the technical field of metal part machining and assembling. The production line comprises a feeding station, a drilling station, a foot sleeve adding station, an extrusion deformation station and a splayed front foot ladder assembling station, and the feeding station is provided with a feeding mechanism; the drilling station is provided with a drilling mechanism; the foot sleeve mounting station is provided with a foot sleeve mounting mechanism; the extrusion deformation station is provided with an extrusion deformation mechanism; the splayed front foot ladder assembly station is provided with a first manipulator mechanism which is used for grabbing and obliquely turning the ladder tube with the fixed foot sleeve and placing the ladder tube on the front foot ladder limiting jig in a splayed shape; the multiple stations share one set of first mechanical arm mechanism, and the first mechanical arm mechanism is used for grabbing, transferring and steering the ladder pipes according to the requirements of the stations. The production line has the characteristics of less labor, simplicity in operation, automatic processing, high efficiency and the like, so that the production benefit is maximized.

Description

Technical Field

[0001] The present invention relates to the technical field of metal part processing and assembly, and particularly to an automatic feeding, drilling, and extrusion deformation production line for metal ladder tubes. Background Art

[0002] With the development of social industry and commerce, the living and working spaces of people are relatively reduced. Most daily necessities are required to be simple to operate and easy to fold and move to reduce the occupied space. Metal folding step ladders are widely used by the public for their advantages of simple structure and easy storage and carrying after folding.

[0003] Combined with Figure 1 , the metal folding step ladder includes a front foot ladder A and a rear foot ladder B movably connected to the front foot ladder. The front foot ladder and the rear foot ladder usually switch between the unfolded state and the folded state to meet the usage needs of people at different times. Among them, the front foot ladder refers to a climbable structure formed by connecting and supporting several steps between two ladder tubes, which is the core component of the metal step ladder. The two ladder tubes are arranged in a V-shaped layout, serving as the two side support parts of the front foot ladder. The steps refer to the cross bars for stepping on the front foot ladder, which are usually composed of multiple cross bars with gradually narrowing lengths. A non-slip foot cover for protecting the foot tubes and preventing the foot ladder from sliding is usually installed at the bottom of the front foot ladder, and a tool box for placing working accessories is usually installed at the top of the front foot ladder.

[0004] Due to the unique shape and structure of the front foot ladder, it often requires metal surface treatment processes such as V-shaped feeding arrangement of the ladder tubes, drilling and tapping, punching, and extrusion deformation, and also requires installing non-slip foot covers at the bottom of the two ladder tubes and tool boxes at the top of the two ladder tubes. In production practice, these processes are usually completed manually, and although automatic processing is adopted in some of these processes, multiple people are still required for operations such as loading and unloading, manual drilling and tapping, punching, extrusion deformation, and installation of accessories such as non-slip foot covers and tool boxes.

[0005] To further reduce costs and improve processing efficiency, an automated processing equipment, an automatic V-shaped feeding arrangement of ladder tubes, automatic drilling and tapping, automatic installation of accessories, and automatic extrusion deformation processing production line, is specifically designed. This equipment production line has the characteristics of few workers, simple operation, automatic processing, and high efficiency to maximize production benefits.

[0006] Therefore, we propose an automatic feeding, drilling, and extrusion deformation production line for metal ladder tubes to facilitate solving the problems raised above. Summary of the Invention

[0007] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide an automatic feeding, drilling, and extrusion deformation production line for metal ladder tubes.

[0008] The object of the present invention is achieved by the following technical solutions: An automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes, including,

[0009] A feeding station, which is provided with a feeding mechanism for horizontally transferring the ladder tubes of a folding ladder to the drilling station;

[0010] A drilling station, which is provided with a drilling mechanism for drilling and / or punching on the inner side of the ladder tube;

[0011] A footrest sleeve installation station, which is provided with a footrest sleeve installation mechanism for sleeving the footrest sleeve at the bottom end of the ladder tube;

[0012] An extrusion and deformation station, which is provided with an extrusion and deformation mechanism for applying an external force to the ladder tube with a footrest sleeve installed, and locally deforming the ladder tube to fix and limit the footrest sleeve at the bottom end of the ladder tube;

[0013] An eight-shaped front-leg ladder assembly station, which is provided with a first manipulator mechanism for grasping, tilting and turning the ladder tube with the footrest sleeve fixed, and placing it in an eight-shaped manner on the front-leg ladder limiting fixture;

[0014] A group of first manipulator mechanisms are shared among the drilling station, the footrest sleeve installation station, the extrusion and deformation station, and the eight-shaped front-leg ladder assembly station, and are used to grasp, transfer and turn the ladder tube according to the needs of each station among the stations.

[0015] Further, in the automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes, the feeding mechanism includes an X-axis conveying device for horizontally conveying the ladder tubes, a turning device for horizontally turning the ladder tubes by 90°, and a second manipulator mechanism for transferring the ladder tubes 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 ladder tubes are horizontally placed side by side on the X-axis conveying device. When the X-axis conveying device conveys the ladder tubes to the turning device, after the turning device rotates, the short side of the cross-section of the ladder tube faces upward; the second manipulator mechanism transfers the ladder tubes from the feeding station to the drilling station;

[0016] The turning device is provided with a rotating disk, and a plurality of notches for accommodating the ladder tubes are arranged on the periphery of the rotating disk. When the ladder tubes are pushed into the notches by the X-axis conveying device and the rotating disk rotates, the ladder tubes are flipped from the horizontal state to the upright state;

[0017] The second manipulator mechanism includes a second clamping device, a clamping device Z-axis lifting device for driving the second clamping device to move along the Z-axis direction, and a clamping device Y-axis moving device for driving the clamping device Z-axis lifting device to move left and right along the Y-axis direction.

[0018] Furthermore, in the automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes, the drilling mechanism includes a ladder tube limit seat, a horizontal drilling and tapping device, a horizontal punching device, and a clamping assembly; the horizontal drilling and tapping device and the horizontal punching device are located on one side of the ladder tube limit seat, and the clamping assembly is arranged on the other side of the ladder tube limit seat. When the ladder tube is placed on the ladder tube limit seat, the clamping assembly presses the ladder tube into the ladder tube limit seat, and the horizontal drilling and tapping device and the horizontal punching device perform drilling and tapping or / and punching at a preset drilling position of the ladder tube;

[0019] The clamping assembly comprises a clamping block and a spinning device which is transmission-connected to the clamping block. The spinning device drives the clamping block to switch between a state of clamping the ladder pipe and a state of loosening and moving away from the ladder pipe.

[0020] Furthermore, in the automatic loading, drilling, extrusion and deformation production line for metal ladder tubes, the foot cover installation mechanism includes a material box trough for conveying the foot cover, a reciprocating pusher arranged in the material box trough, a power device for driving the reciprocating pusher to slide in the material box trough, and a pushing assembly for pushing the foot cover out of the material box trough and pushing it into the bottom end of the ladder tube; the material box trough is provided with at least one discharge port and a feed port; the foot cover enters the material box trough from the feed port and is pushed to the discharge port by the reciprocating pusher. When it is detected that the ladder tube is in place at the discharge port, the pushing assembly extends to push the foot cover out of the material box trough and push it into the bottom end of the ladder tube.

[0021] Furthermore, in the automatic feeding, drilling, extrusion and deformation production line for the metal ladder tube, the extrusion deformation mechanism includes an extrusion block, an extrusion block Z-axis telescopic device for driving the extrusion block to telescope up and down along the Z-axis direction, and an extrusion block Y-axis sliding device for driving the extrusion block Z-axis telescopic device to move left and right along the Y-axis direction, and the extrusion block is located above the foot cover mounting mechanism; when the foot cover is installed at the bottom end of the ladder tube, the extrusion block is moved by the extrusion block Y-axis sliding device to a preset position above the ladder tube, and then driven downward by the extrusion block Z-axis telescopic device to extrude it, and the ladder tube is locally concave and deformed at the preset position to fix the foot cover at the bottom end of the ladder tube.

[0022] Furthermore, in the automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes, the foot cover installation station is provided with a material box slot, a discharge port is provided at each end of the material box slot, a feed port is provided in the middle of the material box slot, and a ladder tube limit seat for placing the ladder tube is provided at each of the two discharge ports;

[0023] The foot cover installation station is also provided with a ladder tube flipping device, which is arranged between the two ladder tube limit seats and is used to take out the ladder tube that has completed the drilling process in the ladder tube limit seat and flip it to another ladder tube limit seat to wait for the foot cover installation process;

[0024] The extrusion deformation station is provided with two extrusion deformation mechanisms, which respectively perform extrusion deformation on the ladder tubes on the two ladder tube limiting seats.

[0025] Further, in the automatic feeding, drilling, and extrusion deformation production line for metal ladder tubes, the ladder tube flipping device includes a rotating arm, a movable gripper installed at the end of the rotating arm, and a rotating arm Z-axis lifting device that drives the rotating arm to move up and down along the Z-axis.

[0026] Further, in the automatic feeding, drilling, and extrusion deformation production line for metal ladder tubes, the front foot ladder limit fixture includes a bottom plate, a first ladder tube limit seat, a second ladder tube limit seat, and a stepping crossbar limit seat;

[0027] The first ladder tube limit seat and the second ladder tube limit seat are arranged in a V-shape on the bottom plate, and the stepping crossbar limit seat is arranged between the first ladder tube limit seat and the second ladder tube limit seat; the first ladder tube limit seat is fixedly installed on the bottom plate, and the second ladder tube limit seat is movably installed on the bottom plate and can switch between positions close to or far from the first ladder tube limit seat.

[0028] Further, in the automatic feeding, drilling, and extrusion deformation production line for metal ladder tubes, the first robotic arm mechanism includes a first gripper device, a gripper Z-axis lifting device that drives the first gripper device to move along the Z-axis, a gripper Y-axis moving device that drives the gripper Z-axis lifting device to move left and right along the Y-axis, and an angle adjustment device for adjusting the first gripper device to a preset angle;

[0029] The angle adjustment device includes a first mounting plate, a second mounting plate, and an adjustment cylinder; the first mounting plate is pivotally connected to the second mounting plate through a pivot, one end of the first mounting plate away from the pivot is fixed to the first gripper device, and one end of the second mounting plate away from the pivot is fixed to the gripper Z-axis lifting device;

[0030] The adjustment cylinder is arranged on the side away from the pivot, one end of the adjustment cylinder is pivotally connected to the first gripper device, and the other end of the adjustment cylinder is pivotally connected to the gripper Z-axis lifting device.

[0031] Further, in the automatic feeding, drilling, and extrusion deformation production line for metal ladder tubes, the gripper Z-axis lifting device is provided with a plurality of position sensors arranged in the vertical direction.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] 1. In order to further reduce costs and improve processing efficiency, the present invention specially designs an automated processing device, an automatic V-shaped feeding arrangement, automatic drilling and tapping, automatic fitting installation, and automatic extrusion deformation processing production line for ladder tubes. This equipment production line has the characteristics of few workers, simple operation, automatic processing, and high efficiency, so as to maximize production benefits.

[0034] 2. Specifically, the present invention arranges two ladder tubes in an eight-shaped shape on the front foot ladder limiting fixture, and simultaneously pre-installs other accessories such as cross bars and foot covers on the front foot ladder limiting fixture. The front foot ladder limiting fixture pre-sets various limiting seats of the accessories required for the front foot ladder A, which is convenient for the implementation of subsequent drilling and fixing processes. Through the operation of various mechanisms on the production line of the present invention, the above-mentioned accessories complete position pre-installation, pre-drilling, and extrusion deformation to achieve automated installation of scattered accessories, thereby improving production efficiency.

[0035] 3. In the present application, the ladder pipes are transported horizontally and side by side to the notch in the rotating disc in sequence by a belt device at the loading station, and then the steering device is rotated, and the horizontally lying ladder pipes are turned to a certain angle to flip them to an upright state. On the one hand, it is convenient for the second manipulator mechanism to clamp them, and on the other hand, the direction of the ladder pipes is flipped in advance to facilitate direct construction at the drilling station.

[0036] 4. According to the installation requirements of the cross bar and the top pedal, fastening holes or installation holes are opened in advance on the ladder pipe. Specifically, a number of horizontal drilling devices and / or horizontal punching devices are set in the middle of the mounting platform. In order to improve the adaptability of different products for assembling herringbone ladders, the horizontal drilling devices and / or horizontal punching devices of the present invention can be provided with multiple axial moving devices such as X-axis, Y-axis, and Z-axis (not marked in the drawings), which are used to drive the horizontal drilling devices and / or horizontal punching devices to move to the required position for drilling, thereby improving the processing adaptability and efficiency of this work station.

[0037] 5. Existing foot covers usually require manual installation, repeated adjustment of the installation position, and additional manual extrusion and shaping processes after installation. The assembly efficiency is extremely low, and the ladder pipe fittings are long, which makes installation and transportation inconvenient. A larger processing site is required, which is not conducive to mass production of the product. To this end, the present invention inserts the process of automated assembly of the foot covers during the drilling process, and can complete the assembly of the entire foot cover before transferring to the figure-eight front foot ladder assembly station. Specifically, the two steps of inserting the foot cover and extruding and deforming the ladder pipe are included. The above processing steps are completely completed by automated processing of the equipment, without the need for manual intervention, which greatly improves production efficiency and avoids tolerance errors in manual assembly. In addition, the mechanism is located on the upper side of the mounting platform, which rationally utilizes the positions on both sides of the drilling station, improves the utilization efficiency of the site, and improves the overall production and assembly efficiency.

[0038] 6. In order to further improve efficiency and rationally utilize the processing space in the factory, the present invention specifically designs the material entry and exit positions in the material box slot in coordination with the reciprocating push handle structure to improve the feeding efficiency of the foot cover. At the same time, combined with the cooperation of the ladder tube turning device, it can shorten the installation time of the foot cover of a single stepladder as a whole, greatly free up manpower and improve assembly efficiency.

[0039] 7. The present invention provides an angle adjustment device in the manipulator mechanism. After the first clamping device picks up the ladder tube, it can be rotated outward or inward by a certain preset angle. This angle adjustment is achieved and completed by setting the pivot connection relationship between the cylinder stroke and the two mounting plates. This structure is simple and can achieve two-way adjustment, realizing the automatic assembly of the eight-shaped ladder legs. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic structural diagram of a metal folding ladder in the prior art;

[0041] Figure 2 is a schematic structural diagram of the front ladder of the metal folding ladder of the present invention;

[0042] Figure 3 is a schematic structural diagram of an automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes in a preferred embodiment of the present invention;

[0043] Figure 4 is a schematic structural diagram of a feeding mechanism in an automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes in a preferred embodiment of the present invention;

[0044] Figure 5 is Figure 4 an enlarged schematic diagram of part a in

[0045] Figure 6 is a schematic structural diagram of a drilling mechanism, a foot sleeve installation mechanism, an extrusion and deformation mechanism, and a first manipulator mechanism in an automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes in a preferred embodiment of the present invention;

[0046] Figure 7 is an enlarged schematic diagram of the first manipulator mechanism in an automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes in a preferred embodiment of the present invention;

[0047] Figure 8 is Figure 7 an enlarged schematic diagram of part b in

[0048] Figure 9 is an enlarged schematic diagram of the second manipulator mechanism in an automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes in a preferred embodiment of the present invention;

[0049] Figure 10 is a schematic structural diagram of a drilling mechanism and a foot sleeve installation mechanism in an automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes in a preferred embodiment of the present invention;

[0050] Figure 11 is Figure 10 an enlarged schematic diagram of part c in

[0051] Figure 12 is Figure 10 a partial schematic diagram in

[0052] Figure 13 is Figure 12 an enlarged schematic view of position d in

[0053] Figure 14 is a schematic structural view of the drilling mechanism and the footrest mounting mechanism of the automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes according to a preferred embodiment of the present invention from another angle;

[0054] Figure 15 is Figure 14 a partial schematic view of

[0055] Figure 16 is a schematic structural view of the front foot ladder limit fixture in the automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes according to a preferred embodiment of the present invention;

[0056] In the figure: 1. Feeding mechanism; 11. X-axis conveying device; 12. Steering device; 122. Notch; 13. Second manipulator mechanism; 131. Second clamping device; 132. Second clamping Z-axis lifting device; 133. Second clamping Y-axis moving device;

[0057] 2. Drilling mechanism; 21. Ladder tube limit seat; 22. Horizontal drilling and tapping device; 23. Horizontal drilling device; 24. Pressing component; 241. Pressing block; 242. Spinning device;

[0058] 3. Footrest mounting mechanism; 31. Magazine slot; 311. Discharge port; 312. Feed port; 32. Reciprocating pusher; 33. Power device; 34. Pushing component; 35. Ladder tube flipping device; 351. Rotating arm; 352. Movable gripper; 353. Rotating arm Z-axis lifting device;

[0059] 4. Extrusion and deformation mechanism; 41. Extrusion block; 42. Extrusion block Z-axis telescopic device; 43. Extrusion block Y-axis sliding device;

[0060] 5. First manipulator mechanism; 51. First clamping device; 52. First clamping Z-axis lifting device; 53. First clamping Y-axis moving device; 54. Angle adjustment device; 541. First mounting plate; 542. Second mounting plate; 543. Adjusting cylinder; 544. Pivot; 55. Position sensor;

[0061] 6. Front foot ladder limit fixture; 61. Base plate; 62. First ladder tube limit seat; 63. Second ladder tube limit seat; 64. Treading crossbar limit seat; 65. Footrest positioning seat; 66. Locking part;

[0062] A. Front foot ladder; A1. Ladder tube; A2. Crossbar; A3. Footrest; B. Rear foot ladder. Specific embodiments

[0063] Next, in combination with the accompanying drawings and specific embodiments, the present invention will be further described. It should be noted that, on the premise of non-conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0064] As Figure 2 shown, the metal folding stepladder 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 usually switch between the unfolded state and the folded state to meet the usage requirements of people at different times. As Figure 2 shown, the front ladder A of the present invention refers to a climbable structure formed by connecting and supporting several pedals between two ladder tubes, which is the core component of the metal stepladder. The two ladder tubes A1 are arranged in a V-shape and are the side support parts of the front ladder. The pedals refer to the crossbars A2 on the front ladder for stepping on, and are usually composed of multiple crossbars with gradually narrowing lengths. A foot sleeve A3 for protecting the foot tube and preventing the ladder from sliding is usually installed at the bottom of the front ladder A, a top pedal is usually installed at the upper part of the front ladder A, and a tool box for placing working accessories is usually installed at the top of the front ladder A.

[0065] The automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes of the present invention is the core processing process of the front ladder A of the metal stepladder. The main accessories and structures of the front ladder are pre-assembled through the production line of the present invention, which facilitates the subsequent assembly of the rear ladder and eliminates the excessive tolerances or low efficiency caused by manual assembly of all accessories.

[0066] As Figure 3-16 shown, an automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes includes

[0067] a feeding station, and the feeding station is provided with a feeding mechanism 1 for horizontally transferring the ladder tube A1 of the stepladder to the drilling station;

[0068] a drilling station, and the drilling station is provided with a drilling mechanism 2 for drilling and / or punching on the inner side of the ladder tube A1;

[0069] a foot sleeve installation station, and the foot sleeve installation station is provided with a foot sleeve installation mechanism 3 for sleeving the foot sleeve on the bottom end of the ladder tube A1;

[0070] an extrusion and deformation station, and the extrusion and deformation station is provided with an extrusion and deformation mechanism 4 for applying an external force to the ladder tube A1 equipped with the foot sleeve, so that the ladder tube A1 is locally sunken and deformed to fix and limit the foot sleeve at the bottom end of the ladder tube A1;

[0071] a V-shaped front ladder assembly station, and the V-shaped front ladder assembly station is provided with a first manipulator mechanism 5 for grasping the ladder tube after the foot sleeve is fixed, tilting and turning it, and placing it in a V-shape on the front ladder limiting fixture 6;

[0072] A set of first manipulator mechanisms 5 is shared among the drilling station, the foot sleeve installation station, the extrusion deformation station, and the assembly station of the front foot ladder in an eight-character shape, which is used to grasp, transfer, and turn the ladder tube A1 between different stations according to the requirements of the stations.

[0073] In the present invention, two ladder tubes A1 are arranged in an eight-character shape in the front foot ladder limit fixture 6, and other accessories such as cross bars and foot sleeves are also pre-installed on the front foot ladder limit fixture 6 synchronously. The front foot ladder limit fixture 6 pre-sets various limit seats for the accessories required by the front foot ladder A, which is convenient for the implementation of subsequent drilling and fixing processes. Through the operation of each mechanism on the production line of the present invention, the above-mentioned accessories complete the pre-installation of positions, pre-drilling, and extrusion deformation to realize the automatic installation of scattered accessories and improve production efficiency.

[0074] As a further preferred solution, the feeding mechanism 1 includes an X-axis conveying device 11 for horizontally conveying the ladder tube A1, a turning device 12 for horizontally turning the ladder tube A1 by 90°, and a second manipulator mechanism 13 for transferring the ladder tube A1 from the feeding station to the drilling station. The turning device 12 is arranged at the end of the conveying direction of the X-axis conveying device 11; the ladder tubes A1 are horizontally arranged side by side on the X-axis conveying device 11. When the X-axis conveying device 11 conveys the ladder tube A1 to the turning device 12, after the turning device 12 rotates, the short side of the cross-section of the ladder tube A1 faces upward; the second manipulator mechanism 13 transfers the ladder tube A1 from the feeding station to the drilling station.

[0075] The turning device 12 is provided with a rotating disk, and a plurality of notches 122 for accommodating the ladder tube A1 are arranged on the periphery of the rotating disk. When the ladder tube is pushed into the notch 122 by the X-axis conveying device 11, the rotating disk is driven by a power device to rotate, and the ladder tube A1 is flipped from a horizontal state to an upright state; among them, the power device includes but is not limited to existing transmission devices such as motors and belt transmission devices.

[0076] The second manipulator mechanism 13 includes a second clamping device 131, a second clamping device Z-axis lifting device 132 for driving the second clamping device to move along the Z-axis direction, and a second clamping device Y-axis moving device 133 for driving the clamping device Z-axis lifting device to move left and right along the Y-axis direction.

[0077] In this application, on the feeding station, it is conveyed horizontally side by side in sequence through a belt device and sent into the notch 122 in the rotating disk. Then, the turning device 12 rotates, and the horizontally lying ladder tube is turned by a certain angle to flip it to an upright state. On the one hand, it is convenient for the second manipulator mechanism 13 to clamp, and on the other hand, the direction of the ladder tube is pre-flipped, which is convenient for the direct construction of the drilling station.

[0078] As a further preferred embodiment, the drilling mechanism 2 includes a ladder tube limit seat 21, a horizontal drilling and tapping device 22, a horizontal punching device 23, and a clamping assembly 24; the horizontal drilling and tapping device 22 and the horizontal punching device 23 are located on one side of the ladder tube limit seat 21, and the clamping assembly 24 is arranged on the other side of the ladder tube limit seat 21. When the ladder tube A1 is placed on the ladder tube limit seat 21, the clamping assembly 24 presses the ladder tube A1 in the ladder tube limit seat 21, and the horizontal drilling and tapping device 22 and the horizontal punching device 23 perform drilling and tapping or / and punching at the preset drilling position of the ladder tube A1;

[0079] The clamping assembly 24 includes a clamping block 241 and a spinning device 242 drivingly connected to the clamping block 241 . The spinning device 242 drives the clamping block 241 to switch between a state of clamping the ladder tube and a state of loosening and moving away from the ladder tube.

[0080] According to the installation requirements of the cross bar and the top pedal, fastening holes or installation holes are pre-opened on the ladder pipe A1, and specifically, a number of horizontal drilling devices 22 and / or horizontal punching devices 23 are arranged in the middle of the mounting platform. In order to improve the adaptability of assembling different products of herringbone ladders, the horizontal drilling devices 22 and / or horizontal punching devices 23 of the present invention can be provided with multiple axial moving devices such as X-axis, Y-axis, and Z-axis (not marked in the drawings), which are used to drive the horizontal drilling devices 22 and / or horizontal punching devices 23 to move to the desired position for drilling, thereby improving the processing adaptability and efficiency of this work station.

[0081] As a further preferred embodiment, the foot cover installation mechanism 3 includes a material box groove 31 for conveying the foot cover, a reciprocating pusher 32 arranged in the material box groove 31, a power device 33 for driving the reciprocating pusher 32 to slide in the material box groove 31, and a pushing assembly 34 for pushing the foot cover out of the material box groove 31 and pushing it into the bottom end of the ladder pipe A1; the material box groove 31 is provided with at least one discharge port 311 and a feed port 312; the foot cover enters the material box groove 31 from the feed port 312, and is pushed to the discharge port 311 by the reciprocating pusher 32. When it is detected that the discharge port 311 is in place out of the ladder pipe A1, the pushing assembly 34 extends to push the foot cover out of the material box groove 31 and push it into the bottom end of the ladder pipe A1.

[0082] As a further preferred embodiment, the extrusion deformation mechanism 4 includes an extrusion block 41, an extrusion block Z-axis telescopic device 42 for driving the extrusion block 41 to telescope up and down along the Z-axis direction, and an extrusion block Y-axis sliding device 43 for driving the extrusion block Z-axis telescopic device 42 to move left and right along the Y-axis direction. The extrusion block 41 is located above the foot cover mounting mechanism 3; when the foot cover is installed at the bottom end of the ladder pipe, the extrusion block 41 is moved by the extrusion block Y-axis sliding device 43 to a preset position above the ladder pipe A1, and then driven downward by the extrusion block Z-axis telescopic device 42 to be extruded, and the ladder pipe A1 is locally concave and deformed at the preset position to fix the foot cover at the bottom end of the ladder pipe A1.

[0083] Existing foot sleeves usually need to be installed manually, with the installation position adjusted repeatedly. After installation, an additional manual extrusion and shaping process is required. The assembly efficiency is extremely low. Moreover, the length of the pipe fitting A1 of the ladder tube is large, making installation and transportation inconvenient, and a larger processing site is needed, which is not conducive to mass production of products. For this reason, in the present invention, during the drilling process, an automated assembly process for the foot sleeve is interspersed, and the entire assembly of the foot sleeve can be completed before transferring to the assembly station of the front foot ladder in a figure-eight shape. Specifically, it includes two steps: inserting the foot sleeve and extruding and deforming the ladder tube A1. The above processing steps are completely completed by automated equipment processing without manual intervention, greatly improving production efficiency and avoiding tolerance errors in manual assembly. In addition, this mechanism is located at the upper part of one side of the installation table, reasonably utilizing the positions on both sides of the drilling station, improving the utilization efficiency of the site and the overall production and assembly efficiency.

[0084] As a further preferred solution, the foot sleeve installation station is provided with a material box slot 31. There is an outlet 311 at each end of the material box slot 31, and a feed inlet 312 is provided in the middle of the material box slot 31. A ladder tube limit seat 21 for placing the ladder tube A1 is correspondingly provided at each of the two outlets 311.

[0085] The foot sleeve installation station is further provided with a ladder tube flipping device 35. The ladder tube flipping device 35 is arranged between the two ladder tube limit seats 21, and is used to take out the ladder tube A1 that has completed the drilling process in the ladder tube limit seat 21 and flip it into another ladder tube limit seat 21 to wait for the foot sleeve installation process.

[0086] The extrusion and deformation station is provided with two extrusion and deformation mechanisms 4, which respectively perform extrusion and deformation on the ladder tubes A1 on the two ladder tube limit seats 21.

[0087] In order to further improve efficiency and reasonably utilize the processing space of the factory building, the present invention specifically designs the cooperation between the feeding and discharging positions in the material box slot 31 and the structure of the reciprocating pusher 32 to improve the feeding efficiency of the foot sleeve. At the same time, combined with the cooperation of the ladder tube flipping device 35, the installation time of the foot sleeve of a single folding ladder can be shortened as a whole, greatly releasing manpower and improving assembly efficiency.

[0088] As a further preferred solution, 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 direction.

[0089] As a further preferred solution, the front foot ladder limit fixture 6 includes a bottom plate 61, a first ladder tube limit seat 62, a second ladder tube limit seat 63, a stepping crossbar limit seat 64, a foot sleeve positioning seat 65, and a locking fastener 66.

[0090] The first ladder tube limiting seat 62 and the second ladder tube limiting seat 63 are arranged in a V-shaped layout on the bottom plate 61, and the stepping crossbar limiting seat 64 is arranged 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 bottom plate 61, and the second ladder tube limiting seat 63 is movably installed on the bottom plate 61 and can switch positions between being close to or away 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 footrest positioning seats 65 for defining the starting position of the footrest at the bottom of the front ladder. After the footrest is 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 first manipulator mechanism 5 in a V-shaped distribution. Then, accessories such as the stepping crossbar A2 and the top pedal are manually installed between the two ladder tubes A1. Both ends of the crossbar A2 have a U-shaped opening for clamping 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 a locking member, so that the front ladder A is completely installed and limited at the front ladder limiting jig 6 according to the preset angle and position, facilitating subsequent drilling and tapping operations, that is, drilling and tapping and locking the crossbar A2 and the ladder tube A1 through an existing drilling and tapping device, realizing the transformation of the cumbersome fastener positioning process into a simple direct drilling and tapping process.

[0091] As a further preferred solution, the first manipulator mechanism 5 includes a first clamping device 51, a first clamping Z-axis lifting device 52 for driving the first clamping device 51 to move along the Z-axis direction, a first clamping Y-axis moving device 53 for driving the first clamping Z-axis lifting device 52 to move left and right along the Y-axis direction, and an angle adjustment device 54 for adjusting the first clamping device to a preset angle;

[0092] The angle adjustment device 54 includes a first mounting plate 541, a second mounting plate 542, and an adjustment cylinder 543; the first mounting plate 541 is pivotally connected to the second mounting plate 542 through a pivot 544. One end of the first mounting plate 541 away from the pivot 544 is fixed to the first clamping device, and one end of the second mounting plate 542 away from the pivot 544 is fixed to the clamping Z-axis lifting device;

[0093] The adjustment cylinder 543 is arranged on the side away from the pivot 544. One end of the adjustment cylinder 543 is pivotally connected to the first clamping device, and the other end of the adjustment cylinder 543 is pivotally connected to the clamping Z-axis lifting device.

[0094] In the present invention, an angle adjustment device 54 is provided in the manipulator mechanism. After the first clamping device clamps the ladder tube A1, it is rotated outward or inward by a certain preset angle. This angle adjustment is achieved and completed by setting the relationship between the cylinder stroke and the pivot connection of the two mounting plates. This structure is simple and can achieve two-way adjustment, realizing the automatic assembly of the eight-shaped ladder legs.

[0095] As a further preferred solution, the gripper Z-axis lifting device is provided with a plurality of position sensors 55 arranged in the vertical direction. The position sensors 55 arranged in the vertical direction can provide control in the height position, realizing high-precision alignment, clamping, and transfer work.

[0096] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. An automatic feeding, drilling and extrusion deformation production line for metal ladder tubes, characterized in that, include, A loading station, wherein the loading station is provided with a loading mechanism for horizontally transferring the ladder tube of the stepladder to the drilling station; A drilling station, wherein the drilling station is provided with a drilling mechanism for drilling and / or punching holes inside the ladder tube; A foot cover installation station, wherein the foot cover installation station is provided with a foot cover installation mechanism for sleeve the foot cover on the bottom end of the ladder tube; An extrusion deformation station is provided with an extrusion deformation mechanism for applying external force to the ladder tube equipped with the foot cover, causing the ladder tube to be partially concave and deformed to fix the foot cover at the bottom end of the ladder tube; An eight-shaped front foot ladder assembly station, wherein the eight-shaped front foot ladder assembly station is provided with a first manipulator mechanism for grabbing, tilting and turning the ladder tube after the foot cover is fixed, and placing it in an eight-shaped shape on the front foot ladder limiting fixture; The drilling station, the foot cover installation station, the extrusion deformation station, and the figure-eight front foot ladder assembly station share a set of first manipulator mechanisms for grabbing, transferring and turning the ladder pipe between the stations according to the needs of the stations.

2. The automatic feeding, drilling and extrusion deformation production line for metal ladder tubes according to claim 1, wherein, The feeding mechanism includes an X-axis conveying device for horizontally conveying the ladder pipe, a steering device for horizontally turning the ladder pipe 90 degrees, and a second manipulator mechanism for transferring the ladder pipe from the feeding station to the drilling station, wherein the steering device is arranged at the end of the conveying direction of the X-axis conveying device; the ladder pipes are placed side by side on the X-axis conveying device in a horizontal direction, and when the X-axis conveying device conveys the ladder pipe to the steering device, the steering device rotates so that the short side of the ladder pipe cross section faces upward; the second manipulator mechanism transfers the ladder pipe from the feeding station to the drilling station; The steering device is provided with a rotating disc, and a plurality of notches for accommodating the ladder pipe are provided on the periphery of the rotating disc. When the ladder pipe is pushed into the notch by the X-axis conveying device, the rotating disc rotates, and the ladder pipe is flipped from a horizontal state to an upright state. The second manipulator mechanism includes a second gripper device, a gripper Z-axis lifting device that drives the second gripper device to move along the Z-axis direction, and a gripper Y-axis moving device that drives the gripper Z-axis lifting device to move left and right along the Y-axis direction.

3. The automatic feeding, drilling and extrusion deformation production line for metal ladder pipes according to claim 1, characterized in that, The drilling mechanism includes a ladder tube limit seat, a horizontal drilling and tapping device, a horizontal punching device, and a clamping assembly; the horizontal drilling and tapping device and the horizontal punching device are located on one side of the ladder tube limit seat, and the clamping assembly is arranged on the other side of the ladder tube limit seat. When the ladder tube is placed on the ladder tube limit seat, the clamping assembly presses the ladder tube into the ladder tube limit seat, and the horizontal drilling and tapping device and the horizontal punching device perform drilling and tapping or / and punching at a preset drilling position of the ladder tube; The clamping assembly comprises a clamping block and a spinning device which is transmission-connected to the clamping block. The spinning device drives the clamping block to switch between a state of clamping the ladder pipe and a state of loosening and moving away from the ladder pipe.

4. The automatic feeding, drilling and extrusion deformation production line for metal ladder tubes according to claim 1, wherein The foot sleeve installation mechanism includes a cartridge slot for conveying foot sleeves, a reciprocating pusher disposed in the cartridge slot, a power device for driving the reciprocating pusher to slide in the cartridge slot, and a pushing and jacking assembly for pushing the foot sleeve out of the cartridge slot and jacking it into the bottom end of the ladder tube; the cartridge slot is provided with at least one discharge port and a feed port; the foot sleeve enters the cartridge slot from the feed port and is pushed by the reciprocating pusher to the discharge port. When it is detected that the ladder tube is in place at the discharge port, the pushing and jacking assembly extends, pushes the foot sleeve out of the cartridge slot, and jacks it into the bottom end of the ladder tube.

5. The automatic feeding, drilling and extrusion deformation production line for metal ladder tubes according to claim 1, characterized in that, The extrusion deformation mechanism includes an extrusion block, an extrusion block Z-axis telescoping device for driving the extrusion block to telescopically move up and down along the Z-axis, and an extrusion block Y-axis sliding device for driving the extrusion block Z-axis telescoping device to move left and right along the Y-axis. The extrusion block is located above the foot sleeve installation mechanism; when the foot sleeve is installed at the bottom end of the ladder tube, the extrusion block is moved by the extrusion block Y-axis sliding device to a preset position above the ladder tube, and then driven by the extrusion block Z-axis telescoping device to extrude downward, causing the ladder tube to be locally sunken and deformed at the preset position to fix and limit the foot sleeve at the bottom end of the ladder tube.

6. The automatic feeding, drilling and extrusion deformation production line for metal ladder tubes according to claim 1, characterized in that, The foot sleeve installation station is provided with a cartridge slot, and each end of the cartridge slot is provided with a discharge port, and a feed port is provided in the middle of the cartridge slot. A ladder tube limit seat for placing the ladder tube is correspondingly provided at each of the two discharge ports. The foot sleeve installation station is further provided with a ladder tube flipping device, which is arranged between the two ladder tube limit seats and is used to take out the ladder tube that has completed the drilling process in the ladder tube limit seat and flip it into another ladder tube limit seat to wait for the foot sleeve installation process. The extrusion deformation station is provided with two extrusion deformation mechanisms, which respectively perform extrusion deformation on the ladder tubes on the two ladder tube limit seats.

7. The automatic feeding, drilling and extrusion deformation production line for metal ladder tubes according to claim 6, characterized in that The ladder tube flipping device includes a rotating arm, a movable gripper installed at the end of the rotating arm, and a rotating arm Z-axis lifting device for driving the rotating arm to move up and down along the Z-axis.

8. The automatic feeding, drilling and extrusion deformation production line for metal ladder tubes according to claim 1, characterized in that, The front foot ladder limit fixture includes a bottom plate, a first ladder tube limit seat, a second ladder tube limit seat, and a stepping crossbar limit seat. The first ladder tube limit seat and the second ladder tube limit seat are arranged in a V-shape on the bottom plate, and the stepping crossbar limit seat is arranged between the first ladder tube limit seat and the second ladder tube limit seat; the first ladder tube limit seat is fixedly installed on the bottom plate, and the second ladder tube limit seat is movably installed on the bottom plate and switches between positions close to or away from the first ladder tube limit seat.

9. The automatic feeding, drilling and extrusion deformation production line for metal ladder tubes according to claim 1, characterized in that, The first manipulator mechanism includes a first gripper device, a gripper Z-axis lifting device for driving the first gripper device to move along the Z-axis, a gripper Y-axis moving device for driving the gripper Z-axis lifting device to move left and right along the Y-axis, and an angle adjustment device for adjusting the first gripper device to a preset angle. The angle adjustment device includes a first mounting plate, a second mounting plate, and an adjustment cylinder; the first mounting plate is pivotally connected to the second mounting plate through a pivot, one end of the first mounting plate away from the pivot is fixed to the first gripper device, and one end of the second mounting plate away from the pivot is fixed to the gripper Z-axis lifting device. The adjusting air cylinder is arranged on the side away from the pivot. One end of the adjusting air cylinder is pivotally connected to the first gripper device, and the other end of the adjusting air cylinder is pivotally connected to the gripper Z-axis lifting device.

10. The automatic feeding, drilling and extrusion deformation production line for metal ladder tubes according to claim 9, characterized in that, The gripper Z-axis lifting device is provided with a plurality of position sensors arranged in the vertical direction.

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