A production line for automatic feeding, drilling, extrusion and deformation of metal ladder tubes

Abstract

The present invention discloses an automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes, belonging to the field of metal parts processing and assembly technology. The production line includes a feeding station, a drilling station, a foot cover installation station, an extrusion and deformation station, and an eight-shaped front ladder assembly station. The feeding station is equipped with a feeding mechanism; the drilling station is equipped with a drilling mechanism; the foot cover installation station is equipped with a foot cover installation mechanism; the extrusion and deformation station is equipped with an extrusion and deformation mechanism; the eight-shaped front ladder assembly station is equipped with a first manipulator mechanism for grabbing, tilting and steering the ladder tube after the foot cover is fixed, and placing it in an eight-shaped shape on the front ladder limiting fixture. A group of first manipulator mechanisms are shared among multiple stations, and are used to grab, transfer, and steer the ladder tube between stations according to the needs of each station. The production line has the characteristics of low labor, simple operation, automatic processing, and high efficiency, thereby maximizing production benefits.

Description

Technical Field

[0001] The invention relates to the technical field of metal parts processing and assembly, in particular to an automatic feeding, drilling, extrusion and deformation production line for metal ladder pipes. Background Art

[0002] With the development of industry and commerce, people's living space in homes and offices has been reduced. Most daily necessities require simple operation, easy folding and moving to save space. Folding metal stepladders are widely used by the public due to their simple structure and easy storage and portability after folding.

[0003] Combine Figure 1 The metal folding stepladder includes a front ladder A and a rear ladder B movably connected to the front ladder. The front ladder and the rear ladder can usually switch between an unfolded or folded state to meet people's use needs at different times. The front ladder refers to a climbable structure that connects and supports several steps between two ladder tubes. It is the core component of the metal stepladder. The two ladder tubes are arranged in an eight-shaped shape and serve as the supporting parts on both sides of the front ladder. The pedals refer to the horizontal bars on the front ladder for stepping, which are usually composed of multiple inconsistent horizontal bars with gradually narrowing lengths. The bottom of the front ladder is usually also equipped with anti-slip foot covers for protecting the foot tubes and preventing the ladder from sliding. The top of the front ladder is usually also equipped with a tool box for placing work accessories.

[0004] Due to the unique shape and structure of the front ladder, it often requires processes such as laying out the ladder tubes in an "eight" pattern, drilling, punching, extrusion, and other metal surface treatments. It also requires the installation of non-slip foot covers at the bottom of both ladder tubes, and a tool box at the top of both tubes. In production practice, these processes are usually completed individually by humans. Some processes are automated, but they still require multiple people to operate, including loading and unloading, manual drilling and punching, extrusion, and the installation of accessories such as non-slip foot covers and tool boxes.

[0005] To further reduce costs and improve processing efficiency, we've designed an automated processing line featuring automatic figure-eight (S) loading and arranging of ladder tubes, automated drilling and punching, automated accessory installation, and automated extrusion and deformation processing. This line features minimal labor, simple operation, automated processing, and high efficiency, ensuring maximum production efficiency.

[0006] Therefore, we proposed a metal ladder tube automatic feeding, drilling, extrusion and deformation production line to solve the above problems. Summary of the Invention

[0007] In order to overcome the deficiencies of the prior art, the present invention aims to provide a metal ladder tube automatic feeding, drilling, extrusion and deformation production line.

[0008] The purpose of the present invention is achieved by adopting the following technical solution: a metal ladder tube automatic feeding, drilling, extrusion and deformation production line, comprising:

[0009] A loading station, wherein the loading station is provided with a loading mechanism for horizontally transferring the ladder tubes of the stepladder to the drilling station;

[0010] A drilling station, wherein the drilling station is provided with a drilling mechanism for drilling and / or punching holes inside the ladder tube;

[0011] A foot cover installation station is provided with a foot cover installation mechanism for sleeve-fitting the foot cover onto the bottom end of the ladder tube;

[0012] 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;

[0013] An 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;

[0014] The drilling station, foot cover installation station, extrusion deformation station, and figure eight front foot ladder assembly station share a set of first manipulator mechanisms for grabbing, transferring and steering the ladder pipes between the stations according to the needs of the stations.

[0015] Furthermore, 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 steering device for horizontally turning the ladder tubes 90 degrees, and a second manipulator mechanism for transferring the ladder tubes from the loading station to the drilling station, the steering device being arranged at the end of the conveying direction of the X-axis conveying device; the ladder tubes are placed side by side in the horizontal direction on the X-axis conveying device, and when the X-axis conveying device conveys the ladder tubes to the steering device, the steering device rotates so that the short side of the ladder tube cross section faces upward; the second manipulator mechanism transfers the ladder tubes from the loading station to the drilling station;

[0016] The steering device is provided with a rotating disc, and a plurality of notches are provided on the periphery of the rotating disc for accommodating the ladder tube. When the ladder tube is pushed into the notch by the X-axis conveying device, the rotating disc rotates, thereby turning the ladder tube from a horizontal state to an upright state.

[0017] 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.

[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 pressing assembly includes a pressing block and a spinning device that is transmission-connected to the pressing block. The spinning device drives the pressing block to switch between a state of pressing 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 of the metal ladder tube, the foot sleeve installation mechanism includes a material box trough for conveying the foot sleeve, 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 sleeve 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 feed port; the foot sleeve 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 sleeve out of the material box trough and push it into the bottom end of the ladder tube.

[0021] Furthermore, in the automatic loading, drilling, extrusion and deformation production line for metal ladder tubes, the extrusion deformation mechanism includes an extrusion block, an extrusion block Z-axis telescopic device for driving the extrusion block to extend and retract 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. The extrusion block is located above the foot sleeve mounting 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 downward by the extrusion block Z-axis telescopic device to extrude, and the ladder tube is locally concave and deformed at the preset position to fix the foot sleeve at the bottom end of the ladder tube.

[0022] Furthermore, in the automatic feeding, drilling, extrusion and deformation production line of the metal ladder tube, 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 corresponding to the two discharge ports;

[0023] The foot cover installation station is also provided with a ladder tube turning 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 turn it over to the other 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] Furthermore, in the automatic loading, drilling, extrusion and deformation production line for metal ladder tubes, the ladder tube turning 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 direction.

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

[0027] The first ladder tube limit seat and the second ladder tube limit seat are arranged in an eight-shaped shape on the base plate, and the pedal cross bar 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 mounted on the base plate, and the second ladder tube limit seat is movably mounted on the base plate, and can switch between positions close to or away from the first ladder tube limit seat.

[0028] Furthermore, in the automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes, the first manipulator mechanism includes a first gripping device, a gripping Z-axis lifting device for driving the first gripping device to move along the Z-axis direction, a gripping Y-axis moving device for driving the gripping Z-axis lifting device to move left and right along the Y-axis direction, and an angle adjustment device for adjusting the first gripping 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 via a pivot, an end of the first mounting plate away from the pivot is fixed to the first gripping device, and an end of the second mounting plate away from the pivot is fixed to the gripping Z-axis lifting device;

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

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

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] To further reduce costs and improve processing efficiency, this invention has designed an automated processing equipment that features automatic figure-eight (S) loading and arranging of ladder tubes, automated drilling and punching, automated accessory installation, and automated extrusion and deformation processing. This production line features minimal labor, simple operation, automated processing, and high efficiency, ensuring maximum 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 the various limiting seats of the accessories required for the front foot ladder A, which facilitates 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 the position pre-installation, pre-drilling, and extrusion deformation to realize the 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 at the loading station through a belt device, 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 crossbar and the top pedal, fastening holes or installation holes are opened in advance on the ladder tube. Specifically, several horizontal drilling and tapping devices and / or horizontal punching devices are set in the middle of the mounting platform. In order to improve the adaptability of assembling different products of herringbone ladders, the horizontal drilling and tapping 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 and tapping 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 and requires a larger processing site, which is not conducive to mass production of the product. To this end, the present invention inserts the process of automatic assembly of the foot cover during the drilling process, and can complete the assembly of the entire foot cover before transferring to the eight-shaped front foot ladder assembly station. Specifically, it includes two steps: the insertion of the foot cover and the extrusion deformation of the ladder pipe. The above processing steps are completely completed by automatic processing of the equipment, without the need for manual intervention, which greatly improves production efficiency and avoids tolerance errors in manual assembly. In addition, this mechanism is located on the upper side of the mounting platform, rationally utilizing the positions on both sides of the drilling station, improving the utilization efficiency of the site, and improving 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 improves the feeding efficiency of the foot cover by designing the material inlet and outlet positions in the material box slot and coordinating with the reciprocating push handle structure. At the same time, combined with the cooperation of the ladder tube turning device, it can shorten the overall installation time of the foot cover of a single stepladder, greatly free up manpower and improve assembly efficiency.

[0039] 7. The present invention sets an angle adjustment device in the manipulator mechanism. After the first gripping device grips the ladder tube, it rotates it outward or inward to a preset angle. The 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 two-way adjustment, thereby realizing the automated assembly of the figure-eight ladder legs. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0042] Figure 3 This is a structural diagram of a metal ladder tube automatic feeding, drilling, extrusion and deformation production line according to a preferred embodiment of the present invention;

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

[0044] Figure 5 for Figure 4 A magnified schematic diagram of point a in the middle;

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

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

[0047] Figure 8 for Figure 7 The enlarged schematic diagram of point b in the middle;

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

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

[0050] Figure 11 for Figure 10 The enlarged schematic diagram of point c in the middle;

[0051] Figure 12 for Figure 10 Middle partial schematic diagram;

[0052] Figure 13 for Figure 12 The enlarged schematic diagram of point d in the middle;

[0053] Figure 14 This is a structural schematic diagram from another angle of the drilling mechanism and foot cover installation mechanism in the automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes in a preferred embodiment of the present invention;

[0054] Figure 15 for Figure 14 Middle partial schematic diagram;

[0055] Figure 16 This is a schematic structural diagram of a front ladder limiting fixture in an 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 gripper device; 132, second gripper Z-axis lifting device; 133, second gripper Y-axis moving device;

[0057] 2. Drilling mechanism; 21. Ladder pipe limit seat; 22. Horizontal drilling device; 23. Horizontal punching device; 24. Pressing assembly; 241. Pressing block; 242. Spinning device;

[0058] 3. Foot cover mounting mechanism; 31. Material box slot; 311. Material outlet; 312. Material inlet; 32. Reciprocating pusher; 33. Power unit; 34. Pushing assembly; 35. Ladder tube turning device; 351. Rotating arm; 352. Movable gripper; 353. Rotating arm Z-axis lifting device;

[0059] 4. Extrusion 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 gripper device; 52. First gripper Z-axis lifting device; 53. First gripper Y-axis moving device; 54. Angle adjustment device; 541. First mounting plate; 542. Second mounting plate; 543. Adjustment cylinder; 544. Pivot; 55. Position sensor;

[0061] 6. Front ladder limit fixture; 61. Bottom plate; 62. First ladder tube limit seat; 63. Second ladder tube limit seat; 64. Step crossbar limit seat; 65. Foot cover positioning seat; 66. Locking fastener;

[0062] A. Front ladder; A1. Ladder tube; A2. Crossbar; A3. Foot covers; B. Rear ladder. DETAILED DESCRIPTION

[0063] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0064] like Figure 2 As shown, the metal folding 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 are usually switched between the unfolded and folded states to meet people's usage needs at different times. Figure 2 As shown, the front ladder A of the present invention is a climbable structure consisting of several steps connected and supported between two ladder tubes. It is the core component of a metal stepladder. The two ladder tubes A1 are arranged in a figure-eight pattern and serve as the supporting elements on either side of the front ladder. The steps are horizontal bars A2 on the front ladder for stepping on, typically consisting of multiple, non-uniform bars of gradually tapering lengths. The bottom of the front ladder A is typically equipped with foot covers A3 to protect the foot tubes and prevent the ladder from sliding. A top step is typically installed on the top of the front ladder A. A tool box for storing work accessories is also typically installed at the top of the front ladder A.

[0065] The automatic loading, drilling, extrusion and deformation production line for metal ladder tubes of the present invention is the core processing step 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 avoids the excessive tolerance or low efficiency caused by manual assembly of all accessories.

[0066] like Figure 3-16 As shown, a metal ladder tube automatic feeding, drilling, extrusion and deformation production line includes:

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

[0068] A drilling station, wherein the drilling station is provided with a drilling mechanism 2 for drilling and / or punching holes inside the ladder pipe A1;

[0069] A foot cover installation station is provided with a foot cover installation mechanism 3 for sleeve-mounting the foot cover on the bottom end of the ladder pipe A1;

[0070] An 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 cover, causing the ladder tube A1 to be partially concave and deformed to fix the foot cover at the bottom end of the ladder tube A1;

[0071] An eight-shaped front foot ladder assembly station is provided with a first manipulator mechanism 5 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 6;

[0072] The drilling station, foot cover installation station, extrusion deformation station, and figure-eight front foot ladder assembly station share a set of first manipulator mechanisms 5 for grabbing, transferring, and turning the ladder tube A1 between the stations according to the needs of the stations.

[0073] The present invention arranges two ladder tubes A1 in an eight-shape on the front foot ladder limiting fixture 6, and simultaneously pre-installs other accessories such as cross bars and foot sleeves on the front foot ladder limiting fixture 6. The front foot ladder limiting fixture 6 pre-sets the various limiting seats of the accessories required for the front foot ladder A, which facilitates 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 the position pre-installation, pre-drilling, and extrusion deformation to realize the automatic installation of scattered accessories, thereby improving production efficiency.

[0074] As a further preferred embodiment, the loading mechanism 1 includes an X-axis conveying device 11 for horizontally conveying the ladder pipe A1, a steering device 12 for horizontally turning the ladder pipe A1 90 degrees, and a second manipulator mechanism 13 for transferring the ladder pipe A1 from the loading station to the drilling station. The steering device 12 is arranged at the end of the conveying direction of the X-axis conveying device 11; the ladder pipes A1 are placed side by side in the horizontal direction on the X-axis conveying device 11. When the X-axis conveying device 11 conveys the ladder pipe A1 to the steering device 12, the steering device 12 rotates so that the short side of the cross section of the ladder pipe A1 faces upward; the second manipulator mechanism 13 transfers the ladder pipe A1 from the loading station to the drilling station.

[0075] The steering device 12 is provided with a rotating disc, and a plurality of notches 122 are provided on the periphery of the rotating disc for accommodating the ladder pipe A1. When the ladder pipe is pushed into the notch 122 by the X-axis conveying device 11, the rotating disc is driven to rotate by a power device, thereby flipping the ladder pipe A1 from a horizontal state to an upright state; wherein the power device includes but is not limited to existing transmission devices such as a motor and a belt transmission device.

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

[0077] In the present application, the ladder pipes are transported horizontally and side by side to the notch 122 in the rotating disc at the loading station through a belt device, and then the steering device 12 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 13 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.

[0078] As a further preferred embodiment, the drilling mechanism 2 includes a ladder pipe 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 pipe limit seat 21, and the clamping assembly 24 is arranged on the other side of the ladder pipe limit seat 21. When the ladder pipe A1 is placed on the ladder pipe limit seat 21, the clamping assembly 24 presses the ladder pipe A1 into the ladder pipe 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 pipe A1;

[0079] The pressing assembly 24 includes a pressing block 241 and a spinning device 242 that is transmission-connected to the pressing block 241 . The spinning device 242 drives the pressing block 241 to switch between a state of pressing the ladder pipe and a state of loosening and moving away from the ladder pipe.

[0080] According to the installation requirements of the crossbar and the top pedal, fastening holes or installation holes are pre-opened on the ladder pipe A1. Specifically, a number of horizontal drilling and tapping devices 22 and / or horizontal punching devices 23 are set in the middle of the mounting platform. In order to improve the adaptability of assembling different products of herringbone ladders, the horizontal drilling and tapping 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 and tapping devices 22 and / or horizontal punching devices 23 to move to the required 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 slot 31 for conveying the foot cover, a reciprocating pusher 32 arranged in the material box slot 31, a power device 33 for driving the reciprocating pusher 32 to slide in the material box slot 31, and a pushing assembly 34 for pushing the foot cover out of the material box slot 31 and pushing it into the bottom end of the ladder pipe A1; the material box slot 31 is provided with at least one discharge port 311 and a feed port 312; the foot cover enters the material box slot 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 slot 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 that drives the extrusion block 41 to extend and retract up and down along the Z-axis direction, 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 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 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 A1 pipe fittings are long, which makes installation and transportation inconvenient and requires a larger processing site, 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 cover 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, it includes two steps: the insertion of the foot cover and the extrusion deformation of the ladder pipe A1. 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, this mechanism is located on the upper side of the mounting platform, rationally utilizing the positions on both sides of the drilling station, improving the utilization efficiency of the site, and improving the overall production and assembly efficiency.

[0084] As a further preferred solution, the foot cover installation station is provided with a material box slot 31, with a discharge port 311 at each end of the material box slot 31, and a feed port 312 at the middle of the material box slot 31. A ladder pipe limit seat 21 for placing the ladder pipe A1 is correspondingly provided at the two discharge ports 311;

[0085] The foot cover installation station is further provided with a ladder tube turning device 35, which 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 turn it over to the other ladder tube limit seat 21 to wait for the foot cover installation process;

[0086] The extrusion deformation station is provided with two extrusion deformation mechanisms 4 for respectively extruding and deforming the ladder tubes A1 on the two ladder tube limiting seats 21 .

[0087] In order to further improve efficiency and rationally utilize the processing space in the factory, the present invention specifically designs the material inlet and outlet positions in the material box slot 31 and cooperates with the reciprocating push handle 32 structure to improve the feeding efficiency of the foot cover. At the same time, combined with the cooperation of the ladder tube turning device 35, it can shorten the installation time of the foot cover of a single stepladder as a whole, greatly freeing up manpower and improving assembly efficiency.

[0088] As a further preferred embodiment, the ladder tube turning 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 embodiment, the front ladder limiting fixture 6 includes a base plate 61, a first ladder tube limiting seat 62, a second ladder tube limiting seat 63, a stepping crossbar limiting seat 64, a foot cover positioning seat 65, and a locking member 66;

[0090] The first ladder tube limiting seat 62 and the second ladder tube limiting seat 63 are arranged in an eight-shaped manner on the base 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 base plate 61, and the second ladder tube limiting seat 63 is movably installed on the base plate 61, and can switch between positions 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 foot sleeve positioning seats 65 for limiting the starting position of the foot sleeve at the bottom of the front foot ladder. When the foot sleeve is installed, the ladder tube A1 is automatically installed in the base plate 61 by the first manipulator mechanism 5. The first ladder tube limit seat 62 and the second ladder tube limit seat 63 are distributed in an eight-shaped shape, and then the treading cross bar A2, the top pedal and other accessories are manually installed between the two ladder tubes A1. The two ends of the cross bar A2 have a U-shaped opening for clamping into the ladder tubes A1 at both ends. Then the second ladder tube limit seat 63 is slid close to the first ladder tube limit seat 62, and the position of the second ladder tube limit seat 63 is fixed by a locking piece, so that the front foot ladder A is installed completely according to the preset angle and position and limited on the front foot ladder limit fixture 6, which is convenient for the subsequent drilling and tapping process, that is, the cross bar A2 and the ladder tube A1 are drilled and locked by the existing drilling and tapping device, so as to realize the transformation of the cumbersome fastener positioning process into a simple direct drilling and tapping process.

[0091] As a further preferred embodiment, the first manipulator mechanism 5 includes a first gripper device 51, a first gripper Z-axis lifting device 52 that drives the first gripper device 51 to move along the Z-axis direction, a first gripper Y-axis moving device 53 that drives the first 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 first gripper 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 movably pivoted to the second mounting plate 542 via a pivot 544; the end of the first mounting plate 541 away from the pivot 544 is fixed to the first gripping device, and the end of the second mounting plate 542 away from the pivot 544 is fixed to the gripping Z-axis lifting device;

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

[0094] The present invention provides an angle adjustment device 54 in the manipulator mechanism. After the first gripping device grips the ladder tube A1, it rotates it outward or inward to a preset angle. The angle adjustment is achieved and completed by setting the cylinder stroke and the pivotal relationship between the two mounting plates. The structure is simple, can realize two-way adjustment, and realize the automated assembly of the figure-eight ladder legs.

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

[0096] The above embodiments are only 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 replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A metal ladder tube automatic feeding, drilling, extrusion and deformation production line, characterized in that: include, A loading station, wherein the loading station is provided with a loading mechanism for horizontally transferring the ladder tubes 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 is provided with a foot cover installation mechanism for sleeve-fitting the foot cover onto 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 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, foot cover installation station, extrusion deformation station, and figure-eight front foot ladder assembly station share a set of first manipulator mechanisms for grabbing, transferring, and steering the ladder tubes between the stations according to the needs of the stations; 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 direction, 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 direction. The extrusion block is located above the foot cover mounting mechanism. When the foot cover is mounted on 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 the ladder tube. 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. 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 direction, a gripper Y-axis moving device for driving the gripper Z-axis lifting device to move left and right along the Y-axis direction, 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 adjusting cylinder; the first mounting plate is pivotally connected to the second mounting plate through a pivot movement, the end of the first mounting plate away from the pivot is fixed to the first gripper device, and the end of the second mounting plate away from the pivot is fixed to the gripper Z-axis lifting device; the adjusting cylinder is arranged on the side away from the pivot, one end of the adjusting cylinder is pivotally connected to the first gripper device, and the other end of the adjusting cylinder is pivotally connected to the gripper Z-axis lifting device.

2. The metal ladder tube automatic feeding, drilling, extrusion and deformation production line according to claim 1 is characterized in that: The loading mechanism includes an X-axis conveying device for horizontally conveying the ladder pipes, a steering device for horizontally turning the ladder pipes 90 degrees, and a second manipulator mechanism for transferring the ladder pipes from the loading station to the drilling station. 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 in a horizontal direction on the X-axis conveying device. When the X-axis conveying device conveys the ladder pipes 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 pipes from the loading station to the drilling station. The steering device is provided with a rotating disc, and a plurality of notches are provided on the periphery of the rotating disc for accommodating the ladder tube. When the ladder tube is pushed into the notch by the X-axis conveying device, the rotating disc rotates, thereby turning the ladder tube from a horizontal state to an upright state. The second manipulator mechanism includes a gripping device, a gripping Z-axis lifting device that drives the gripping device to move along the Z-axis direction, and a gripping Y-axis moving device that drives the gripping Z-axis lifting device to move left and right along the Y-axis direction.

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

4. The metal ladder tube automatic feeding, drilling, extrusion and deformation production line according to claim 1 is characterized in that: 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 discharge port and the ladder tube are in place, 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.

5. The metal ladder tube automatic feeding, drilling, extrusion and deformation production line according to claim 1 is characterized in that: The foot cover installation station is provided with a material box slot, a material outlet is provided at each end of the material box slot, a material feed port is provided in the middle of the material box slot, and a ladder pipe limit seat for placing the ladder pipe is provided corresponding to the two material outlets; The foot cover installation station is also provided with a ladder tube turning 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 turn it over to the other ladder tube limit seat to wait for the foot cover 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 limiting seats.

6. The automatic feeding, drilling, extrusion and deformation production line for metal ladder tubes according to claim 5, characterized in that: The ladder tube turning 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 direction.

7. The metal ladder tube automatic feeding, drilling, extrusion and deformation production line according to claim 1, characterized in that: The front ladder limiting fixture includes a bottom plate, a first ladder tube limiting seat, a second ladder tube limiting seat, and a stepping crossbar limiting seat; The first ladder tube limit seat and the second ladder tube limit seat are arranged in an eight-shaped shape on the base plate, and the pedal cross bar 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 mounted on the base plate, and the second ladder tube limit seat is movably mounted on the base plate, and can switch between positions close to or away from the first ladder tube limit seat.

8. The metal ladder tube automatic feeding, drilling, extrusion and deformation production line according to claim 1 is characterized in that: The gripper Z-axis lifting device is provided with a plurality of position sensors arranged in a vertical direction.

Images