Manhole cover welding equipment
By designing automated welding equipment, the automatic positioning and welding of manhole cover U-shaped covers and handles were achieved, solving the problems of high labor intensity and poor welding quality caused by manual operation in the existing technology, and realizing efficient and low deformation automatic welding effect.
Patent Information
- Application Number
- CN202511938411.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-22
- Publication Date
- 2026-03-03
AI Technical Summary
In existing technologies, the welding process of manhole covers relies on manual operation, which leads to high labor intensity for workers, obstructed vision, poor welding quality, and a lack of automatic positioning and clamping structures, becoming a bottleneck for efficient production lines of ship manhole covers.
A manhole cover welding device was designed, which adopts a structure including a hanging rail, an argon arc welding robotic arm, a clamping seat, a storage frame, and an electromagnet to achieve automatic positioning and welding of U-shaped covers and handles. The device identifies the position through a vision system, automatically plans the trajectory, and the robotic arm performs argon arc welding to establish an oxygen-free protection zone and form a stable electric arc, thereby achieving efficient and low-deformation automatic welding.
It improves the convenience and quality of welding, reduces manual operation, lowers labor intensity, ensures high efficiency and quality of welding, and avoids problems such as obstructed vision and heat accumulation during the welding process.
Smart Images
Figure CN121589401A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of arc welding technology, and in particular to a manhole cover welding device. Background Technology
[0002] Ship manhole covers are openable circular or elliptical steel plate doors welded to decks, bulkheads, or liquid tank openings. They consist of a cover plate, a cofferdam (seat ring), hinges, a quick-locking device, and a rubber sealing ring. They are required to be watertight, oiltight, or weathertight, and able to withstand the static pressure and impact of cargo holds and ballast tanks, while facilitating personnel access for maintenance. Argon arc welding is mainly used for ship manhole cover welding because argon gas protection eliminates spatter, allows for single-sided welding with double-sided forming, zero porosity at the root layer, and features concentrated arc and low heat input.
[0003] In the existing TIG welding process for manhole covers, the welding of the current manhole cover handles relies entirely on manual labor. Workers first insert the U-shaped cover into the deep hole and support it for alignment, then manually spot weld the perimeter. Next, they insert the round rod into the same blind cavity, hold the rod for positioning again, and spot weld both ends. Then, they use an TIG welding machine for automatic full welding. Due to the narrow and long cavity and obstructed vision, it is very easy to misalign the workpiece when holding it. Continuous overhead welding puts the welding torch and arm in the same confined space, causing heat accumulation and trembling operation, resulting in poor sealing of the cover, incomplete welding of the round rod, poor appearance, and frequent rework. The entire process lacks automatic docking and clamping structures. The positioning, clamping, and welding steps all need to be completed manually simultaneously, resulting in high labor intensity and close-range exposure to arc light. This has become a significant bottleneck for efficient production lines of ship manhole covers.
[0004] Therefore, a manhole cover welding device was proposed to solve the above problems. Summary of the Invention
[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a manhole cover welding device that can solve the technical problem that the prior art cannot automatically position and weld handles and U-shaped covers.
[0006] The technical solutions provided by the embodiments of the present invention are as follows: This invention provides a manhole cover welding device, including a hanging rail, an argon arc welding robotic arm mounted on the hanging rail, a clamping seat below the hanging rail, a transverse guide rail beside the clamping seat, a bottom frame fixedly connected to the moving end of the transverse guide rail, an upper storage frame for storing U-shaped covers fixedly connected to the top of the bottom frame, a clamping mechanism for clamping manhole covers on the clamping seat, an outlet through the bottom of the upper storage frame near the clamping seat, an L-shaped rod inside the outlet, an upper electromagnet fixedly connected to the side wall of the L-shaped rod, a transverse sliding connection of the bottom end of the L-shaped rod to the inside of the bottom frame, a moving mechanism for driving the L-shaped rod to move on the bottom frame, a lower storage frame for storing handles on the side of the upper storage frame near the clamping seat, a lower electromagnet rod in the lower storage frame, a straight groove adapted to the handle through the top of the L-shaped rod and the upper electromagnet, and a limiting mechanism for limiting the position of the handle.
[0007] Furthermore, the manhole cover is made of carbon steel, and the sidewall of the upper electromagnet is adapted to the inner side of the U-shaped cover.
[0008] Furthermore, a push plate is laterally slidably connected to the inner side of the lower storage frame. Three push springs are fixedly connected at equal intervals between the side wall of the push plate and the inner side of the lower storage frame. A push groove adapted to the handle is provided on the side of the push plate near the lower electromagnet rod. A discharge port is provided at the bottom end of the lower storage frame relative to the lower electromagnet rod. An upper electric telescopic cylinder is fixedly connected to the side wall of the lower storage frame. A connecting plate is fixedly connected to the output end of the upper electric telescopic cylinder. The lower electromagnet rod is fixedly connected to the bottom end of the connecting plate. A side plate is fixedly connected to the side wall of the upper storage frame.
[0009] Furthermore, the top of the outlet is provided with a side groove that is adapted to the lower storage frame. The lower storage frame is longitudinally slidably connected to the inside of the side groove. The side wall of the upper storage frame is fixedly connected to a lower electric telescopic cylinder, and the output end of the lower electric telescopic cylinder is fixedly connected to the top of the lower storage frame.
[0010] Furthermore, the moving mechanism includes a moving motor, a lead screw is rotatably connected to the inner side of the bottom frame, the moving motor is fixedly connected to the side wall of the bottom frame, the output end of the moving motor passes through the inner side of the bottom frame and is fixedly connected to the side wall of the lead screw, and the lead screw is threadedly connected to the inner side wall of the L-shaped rod.
[0011] Furthermore, a pair of support frames are fixedly connected to the side of the clamping seat away from the upper storage frame, and the support frames are located next to the handle of the manhole cover. The side walls of the support frames are fixedly connected to side blocks that are adapted to the outer wall of the U-shaped cover.
[0012] Furthermore, the limiting mechanism includes a limiting electric telescopic cylinder. A top groove is formed at the top of the L-shaped rod, and the limiting electric telescopic cylinder is fixedly connected to the bottom of the top groove. Cavities are formed on both sides of the straight groove. A sliding frame is laterally slidably connected between the bottom ends of the cavities. A pair of positioning rods are slidably connected through the top of the sliding frame. The bottom ends of the positioning rods abut against the bottom of the cavities, and the top ends of the positioning rods extend beyond the top of the sliding frame. Rear blocks for limiting the handle position are laterally slidably connected to the inner sides of the cavities. Rear springs are fixedly connected between the side walls of the rear blocks and the inner sides of the cavities. A U-shaped rod is fixedly connected to the output end of the limiting electric telescopic cylinder. A pair of right-angled plates with inclined surfaces are fixedly connected to the inner side of the U-shaped rod. Lower plates are fixedly connected to the side ends of the U-shaped rod. Isosceles triangular plates with inclined surfaces on both sides are fixedly connected to the opposite side of the lower plates.
[0013] Furthermore, the inclined surface of the right-angle plate is located on the opposite side, and the outer wall of the positioning rod is in contact with the inclined surface of the right-angle plate. The top of each rear block is fixedly connected to a rear rod, the bottom of the L-shaped rod is fixedly connected to an L-shaped lower rod, and a positioning spring is fixedly connected between the inner side of the sliding frame and the outer wall of the positioning rod.
[0014] Furthermore, a reset spring is fixedly connected between the side wall of the sliding frame and the inner side of the cavity. A pair of L-shaped grooves are provided in the cavity. An L-shaped plate is longitudinally slidably connected to the inner side of the L-shaped groove. Three lower springs are fixedly connected between the bottom end of the L-shaped plate and the bottom of the L-shaped groove. Side rods are fixedly connected to the side wall of the L-shaped plate.
[0015] Furthermore, a fixed frame is fixedly connected to the side wall of the lower storage frame relative to the position next to the discharge port. A rod is slidably connected through the side wall of the fixed frame, and the side wall of the rod is set through the outer wall of the lower storage frame. A limit spring is fixedly connected between the inner side of the fixed frame and the outer wall of the rod. A groove is opened on the side plate near the lower storage frame, and the bottom of the groove is inclined. The side end of the rod contacts the inner side of the groove, and the side end of the rod is set as a smooth arc surface.
[0016] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: In this invention, the use of an upper storage frame, a moving mechanism, and an upper electromagnet allows the U-shaped cover to be welded on the manhole cover to be placed in the upper storage frame. After the manhole cover is positioned and clamped, the U-shaped cover is automatically pushed to the designated position for welding. This eliminates the need for workers to perform hand spot welding and then use an argon arc welding robotic arm for welding, greatly improving the convenience of the device.
[0017] By employing a structure including a lower storage frame and a limiting mechanism, the handle stored in the lower storage frame can be automatically pushed to the designated welding position after the U-shaped cover on the manhole cover is positioned and pushed in. This eliminates the need for workers to spot weld the handle; instead, an argon arc welding robotic arm can be used to fully weld the positioned U-shaped cover and handle. After welding, the handle can be automatically removed, further improving the device's convenience. Attached Figure Description
[0018] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the overall appearance structure of the argon arc welding equipment of the present invention.
[0020] Figure 2 This is a schematic diagram of the overall appearance structure of the clamping base, guide rail, and bottom frame of the present invention.
[0021] Figure 3 Appendix of the present invention Figure 2 A magnified schematic diagram of the structure at point A in the middle.
[0022] Figure 4 This is a partial cross-sectional perspective view of the upper and lower storage frames of the present invention.
[0023] Figure 5 This is a partial cross-sectional perspective view of the bottom frame and upper storage frame of the present invention.
[0024] Figure 6 This is a schematic diagram of a partial cross-section of the side of the L-shaped rod of the present invention.
[0025] Figure 7 Appendix of the present invention Figure 6 A magnified schematic diagram of the structure at point B in the middle.
[0026] Figure 8 This is a schematic diagram of the overall appearance structure of the side plate and fixing frame of the present invention.
[0027] Figure 9 This is a schematic diagram of the overall appearance structure of the rear block, L-shaped plate, sliding frame and U-shaped rod of the present invention.
[0028] Figure 10 This is a partial bottom-view perspective view of the lower storage frame and fixing frame of the present invention.
[0029] Explanation of reference numerals in the attached drawings: 1-Hanging rail; 2-Argon arc welding robotic arm; 3-Clamping seat; 4-Transverse guide rail; 5-Base frame; 6-Upper storage frame; 7-Clamping mechanism; 8-Exit; 9-L-shaped rod; 10-Upper electromagnet; 11-Lower storage frame; 12-Lower electromagnet rod; 13-Straight groove; 14-Push plate; 15-Push spring; 16-Upper electric telescopic cylinder; 17-Connecting plate; 18-Lower electric telescopic cylinder; 19-Moving motor; 20-Lead screw; 21-Support frame ; 22-Side block; 23-Limiting electric telescopic cylinder; 24-Sliding frame; 25-Positioning rod; 26-Rear block; 27-Rear spring; 28-U-shaped rod; 29-Right angle plate; 30-Lower plate; 31-Isosceles triangle plate; 32-Rear rod; 33-Reset spring; 34-L-shaped plate; 35-Lower spring; 36-Side rod; 37-L-shaped lower rod; 38-Fixing frame; 39-Insertion rod; 40-Limiting spring; 41-Side plate; 42-Groove; 43-Positioning spring. Detailed Implementation
[0030] To enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.
[0031] Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts disclosed in this invention.
[0032] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention.
[0033] In practical use, it was found that in the existing TIG welding process for manhole covers, the welding of the handles of the current manhole covers is entirely manual. Workers first insert the U-shaped cover into the deep hole and support it for alignment, then manually spot weld the perimeter. After that, the round rod is inserted into the same blind cavity, and the rod is positioned and spot welded at both ends again. Then, an TIG welding machine is used for automatic full welding. Due to the narrow and long cavity and obstructed vision, it is very easy to misalign the workpiece when holding it. Continuous overhead welding puts the welding torch and arm in the same narrow space, causing heat accumulation and trembling operation, resulting in poor sealing of the cover, incomplete welding of the round rod, poor appearance, and frequent rework. The entire process lacks an automatic docking and clamping structure. The positioning, clamping, and welding steps all need to be completed manually simultaneously, which is labor-intensive and exposes the workpiece to arc light at close range. This has become a significant bottleneck for the efficient production line of ship manhole covers. To solve the above problems, the following structure was invented.
[0034] Reference manual attached Figures 1 to 10 This invention provides a manhole cover welding device, including a hanging rail 1 and an argon arc welding robotic arm 2 mounted on the hanging rail 1. When welding the manhole cover handle, the argon arc welding robotic arm 2 first identifies the relative positions of the U-shaped cover, handle, and cover plate using a vision system, automatically plans its trajectory, and can move on the hanging rail 1 to perform argon arc welding on both sides of the manhole cover. The robotic arm holds a TIG welding torch, argon gas is pre-delivered to establish an oxygen-free protection zone, and after high-frequency arc ignition, a stable arc is formed between the welding wire and the base material. The arc moves at a uniform speed at the root of the handle. The weld is fully penetrated to form a uniform weld bead. The current pulse is adjusted in real time according to the plate thickness. The peak value ensures the penetration depth, and the base value reduces heat input to prevent deformation of the cover surface. The current drops slowly after welding and the argon gas extinguishes the arc with lag to avoid crater cracks. The whole process is controlled in a closed loop to achieve efficient, low-deformation, and spatter-free automatic argon arc welding of manhole cover handles and U-shaped covers. A clamping seat 3 is provided below the hanging rail 1, and a transverse guide rail 4 is provided next to the clamping seat 3. The moving end of the transverse guide rail 4 is fixedly connected to a bottom frame 5, and the top of the bottom frame 5 is fixedly connected to an upper storage frame 6 for storing U-shaped covers. The clamping base 3 is provided with a clamping mechanism 7 for clamping the manhole cover. The bottom of the upper storage frame 6 near the clamping base 3 has an outlet 8. An L-shaped rod 9 is provided in the outlet 8. An upper electromagnet 10 is fixedly connected to the side wall of the L-shaped rod 9. The bottom end of the L-shaped rod 9 is slidably connected to the inside of the bottom frame 5. The bottom frame 5 is provided with a moving mechanism for driving the L-shaped rod 9 to move. The upper storage frame 6 near the clamping base 3 has a lower storage frame 11 for storing the handle. A lower electromagnet rod 12 is provided in the lower storage frame 11. The top ends of the L-shaped rod 9 and the upper electromagnet 10 have a straight groove 13 that is adapted to the handle. A limiting mechanism for limiting the position of the handle is also provided. Specifically, the manhole cover is made of carbon steel. Only manhole covers made of carbon steel can be attracted by the upper electromagnet 10 and the lower electromagnet rod 12, making them suitable for automatic positioning welding in this device. The side wall of the upper electromagnet 10 is adapted to the inner side of the U-shaped cover.
[0035] Specifically, the top of the outlet 8 is provided with a side groove that is adapted to the lower storage frame 11. The lower storage frame 11 is longitudinally slidably connected to the inside of the side groove. The side wall of the upper storage frame 6 is fixedly connected to the lower electric telescopic cylinder 18. The output end of the lower electric telescopic cylinder 18 is fixedly connected to the top of the lower storage frame 11. Through the setting of the lower electric telescopic cylinder 18 and the lower storage frame 11, the position of the outlet 8 of the upper storage frame 6 can be limited and blocked, ensuring that the upper electromagnet 10 can be accurately attached to the inside of the U-shaped cover.
[0036] Specifically, the moving mechanism includes a moving motor 19, a lead screw 20 rotatably connected to the inner side of the base frame 5, the moving motor 19 is fixedly connected to the side wall of the base frame 5, the output end of the moving motor 19 passes through the inner side of the base frame 5 and is fixedly connected to the side wall of the lead screw 20, and the lead screw 20 is threadedly connected to the inner side wall of the L-shaped rod 9.
[0037] Specifically, a pair of support frames 21 are fixedly connected to the side of the clamping seat 3 away from the upper storage frame 6, and the support frames 21 are located next to the handle of the manhole cover. The side walls of the support frames 21 are fixedly connected to side blocks 22 that are adapted to the outer wall of the U-shaped cover. Through the setting of the support frames 21 and the side blocks 22, the position of the U-shaped cover after positioning can be restricted and supported.
[0038] During the welding process of the manhole cover, the U-shaped cover is first placed into the upper storage frame 6, and then the handle is placed into the lower storage frame 11. The manhole cover is then fixed to the clamping seat 3 by the clamping mechanism 7. Then, the transverse guide rail 4 is controlled to move the outlet 8 of the upper storage frame 6 to one of the handle welding points on the manhole cover. Then, the moving motor 19 is controlled to start and drive the lead screw 20 to rotate, which in turn drives the threaded L-shaped rod 9 to move laterally in the bottom frame 5 (before this, the U-shaped cover falls to the bottom of the upper storage frame 6 under its own weight, and the upper electromagnet 10 on the side of the L-shaped rod 9 is located next to the U-shaped cover). The movement of the L-shaped rod 9 will drive the upper electromagnet 10 to insert into the bottom U-shaped cover. At this time, the bottom U-shaped cover is restricted by the lower storage frame 11 and therefore cannot be moved out of the outlet 8. Then, when the upper electromagnet 10 is completely in contact with the inside of the U-shaped cover, the moving motor 19 is controlled to stop. The upper electromagnet 10 can be energized to attract and fix the U-shaped cover, while the lower electric telescopic cylinder 18 is activated to move the lower storage frame 11 upward, thereby releasing the position restriction on the bottom U-shaped cover. Then, by continuing to start the moving motor 19, the L-shaped rod 9 is driven to move the bottom U-shaped cover out from the outlet 8. Then, the U-shaped cover in the upper storage frame 6 will fall onto the L-shaped rod 9 under its own weight. Then, the upper electromagnet 10 pushes the U-shaped cover into the cutting opening of the manhole cover and presses the outer wall of the U-shaped cover onto the side block 22, thus completing the automatic positioning and pushing of the U-shaped cover.
[0039] In summary, with the above structural design, the U-shaped cover to be welded on the manhole cover only needs to be placed in the upper storage frame 6. After the manhole cover is positioned and clamped, the U-shaped cover can be automatically pushed to the designated position for welding. There is no need for workers to perform hand spot welding and then use the argon arc welding robotic arm 2 for welding, which greatly improves the convenience of the device.
[0040] Based on the above embodiments, it was found during use that the above structure can only realize the automatic feeding, positioning and welding of the U-shaped cover. During the processing and welding of the manhole cover, the handle on the inside of the U-shaped cover also needs to be welded. Therefore, the above structure lacks the self-positioning and feeding of the handle, and workers still need to perform hand-held spot welding, which is quite troublesome. In order to solve the above problems, the above structure has been further improved.
[0041] Specifically, a push plate 14 is slidably connected to the inner side of the lower storage frame 11. Three push springs 15 are fixedly connected at equal intervals between the side wall of the push plate 14 and the inner side of the lower storage frame 11. The push plate 14 is provided with a push groove adapted to the handle on the side near the lower electromagnet rod 12. The bottom end of the lower storage frame 11 is provided with a discharge port below the lower electromagnet rod 12. An upper electric telescopic cylinder 16 is fixedly connected to the side wall of the lower storage frame 11. A connecting plate 17 is fixedly connected to the output end of the upper electric telescopic cylinder 16. The lower electromagnet rod 12 is fixedly connected to the bottom end of the connecting plate 17. A side plate 41 is fixedly connected to the side wall of the upper storage frame 11.
[0042] Specifically, the limiting mechanism includes a limiting electric telescopic cylinder 23. The top of the L-shaped rod 9 has a top groove, and the limiting electric telescopic cylinder 23 is fixedly connected to the bottom of the top groove. Cavities are opened on both sides of the straight groove 13. A sliding frame 24 is slidably connected between the bottom ends of the cavities. A pair of positioning rods 25 are slidably connected through the top of the sliding frame 24. The bottom end of the positioning rod 25 abuts against the bottom of the cavity. The top end of the positioning rod 25 extends out of the top of the sliding frame 24. A rear block 26 for limiting the position of the handle is slidably connected to the inner side of the cavity. A rear spring 27 is fixedly connected between the side wall of the rear block 26 and the inner side of the cavity. A U-shaped rod 28 is fixedly connected to the output end of the limiting electric telescopic cylinder 23. A pair of right-angled plates 29 with inclined surfaces are fixedly connected to the inner side of the U-shaped rod 28. A lower plate 30 is fixedly connected to the side end of the U-shaped rod 28. An isosceles triangular plate 31 with inclined surfaces on both sides is fixedly connected to the side of the lower plate 30 that is far apart from each other.
[0043] Specifically, the inclined surface of the right-angle plate 29 is set on the side away from each other, and the outer wall of the positioning rod 25 is in contact with the inclined surface of the right-angle plate 29. The top of the rear block 26 is fixedly connected with the rear rod 32, the bottom of the L-shaped rod 9 is fixedly connected with the L-shaped lower rod 37, and the inner side of the sliding frame 24 is fixedly connected with the outer wall of the positioning rod 25. The positioning spring 43 is fixedly connected between the inner side of the sliding frame 24 and the outer wall of the positioning rod 25.
[0044] Specifically, a reset spring 33 is fixedly connected between the side wall of the sliding frame 24 and the inner side of the cavity. A pair of L-shaped grooves are provided in the cavity. An L-shaped plate 34 is longitudinally slidably connected to the inner side of the L-shaped groove. Three lower springs 35 are fixedly connected between the bottom end of the L-shaped plate 34 and the bottom of the L-shaped groove. Side rods 36 are fixedly connected to the side wall of the L-shaped plate 34.
[0045] Specifically, a fixed frame 38 is fixedly connected to the side wall of the lower storage frame 11 relative to the position next to the discharge port. A rod 39 is slidably connected through the side wall of the fixed frame 38, and the side wall of the rod 39 is set through the outer wall of the lower storage frame 11. A limit spring 40 is fixedly connected between the inner side of the fixed frame 38 and the outer wall of the rod 39. A groove 42 is opened on the side of the side plate 41 near the lower storage frame 11, and the bottom of the groove 42 is inclined. The side end of the rod 39 contacts the inner side of the groove 42, and the side end of the rod 39 is set as a smooth arc surface.
[0046] Before welding the manhole cover, push the push plate 14 to compress the push spring 15, and then insert multiple handles into the lower storage frame 11 in sequence. Then, the push plate 14 can be released. Since the lower storage frame 11 is located next to the outlet 8 at this time, the side end of the insertion rod 39 is in contact with the side wall of the side plate 41, and the insertion rod 39 is inserted into the discharge port, restricting the handle from falling. At this time, control the lower electromagnet rod 12 to be energized and attract the handle above the discharge port. Then, when the lower electric telescopic cylinder 18 is started to pull the lower storage frame 11 upward, it will drive the insertion rod 39 to move on the side wall of the side plate 41. Then, the side end of the insertion rod 39 gradually moves along the inclined surface at the bottom of the groove 42 to the inside of the groove 42, thereby releasing the pressure on the insertion rod 39. At this time, under the elastic force of the limit spring 40, the side end of the insertion rod 39 will be pushed into the inside of the groove 42, thereby pulling the insertion rod 39 out of the discharge port and releasing the restriction on the downward movement of the handle. After the U-shaped cover is pushed to the designated position, the upper electric telescopic cylinder 16 can be activated to drive the connecting plate 17 and the lower electromagnet rod 12 to move downwards. This causes the handle, which is held in place by the suction, to pass through the discharge port and insert into the straight groove 13, with the bottom of the handle positioned at the top of the L-shaped lower rod 37. Then, the power supply to the lower electromagnet rod 12 can be cut off, and the upper electric telescopic cylinder 16 can be controlled to reset (the lower electromagnet rod 12 is retracted into the lower storage frame 11; it is not a complete reset, but the handle in the lower storage frame 11 needs to be restrained before the lower storage frame 11 is fully reset). To prevent the material from being pushed to the outlet by the force of the push spring 15 and falling directly down, the limit electric telescopic cylinder 23 can then be started to drive the U-shaped rod 28 to move. Since the sliding frame 24 can only slide laterally inside the cavity, under the push of the right angle plate 29, the positioning rod 25 and the sliding frame 24 will slide inside the cavity and gradually stretch the return spring 33. Then, the sliding frame 24 will push the handle in the straight groove 13 to move. At this time, the handle moves at the top of the L-shaped lower rod 37. The sliding frame 24 then pushes the handle to the position next to the rear block 26, reaching the designated position. At this time, the handle has moved from the L-shaped lower rod 37 to the inside of the U-shaped cover, simultaneously moving the positioning rod 25 to the L-shaped groove, thereby releasing the pressure on the positioning rod 25. Then, under the elastic force of the positioning spring 43, the positioning rod 25 is pushed downward to insert into the L-shaped groove. (Before this, the lower plate 30 on the front side of the U-shaped rod 28 and the isosceles triangular plate 31 pass by the side rod 36. Since the L-shaped plate 34 can only move up and down, it is in the isosceles triangle...) Under the pressure of the inclined surface of plate 31, the side rod 36 and L-shaped plate 34 will be pushed upward, while the lower spring 35 is stretched. Then the isosceles triangular plate 31 will move away from under the side rod 36. Subsequently, under the elastic force of the lower spring 35, the L-shaped plate 34 will be pulled down and reset. At this time, the handle will be pushed to the designated position, thereby clamping the handle between the sliding frame 24 and the rear block 26. Then the argon arc welding robot arm 2 can be controlled to start welding the upper and lower sides of the handle first, and then welding one side of the U-shaped cover. Then the upper electromagnet 10 can be controlled to be de-energized. At this time, the argon arc welding robotic arm 2 is controlled to weld the other side of the U-shaped cover. During the welding process, the limit electric telescopic cylinder 23 can be controlled to continue to start, driving the U-shaped rod 28 and the right-angle plate 29 to continue to move. Since the bottom end of the positioning rod 25 is inserted into the L-shaped groove, the right-angle plate 29 will pass directly over the sliding frame 24. Then the right-angle plate 29 moves to the side of the rear rod 32. Since the rear rod 32 and the rear block 26 can only slide laterally inside the cavity, the pressure of the inclined surface of the right-angle plate 29 will push the rear rod 32 to slide to both sides. The movement compresses the rear spring 27, thereby moving the rear block 26 away from the handle. Then, the moving motor 19 can be controlled to start and drive the lead screw 20 to rotate in the opposite direction, driving the L-shaped rod 9 to reset. At this time, the handle will move out of the straight groove 13. During this process, the limit electric telescopic cylinder 23 can be controlled to start and reset. At this time, the compression on the rear rod 32 will be released first, and the rear block 26 will be pushed to reset under the elastic force of the rear spring 27. Then, when the right angle plate 29 moves out of the positioning rod 25, the isosceles triangle plate 31 will move to the side rod 36. Then, the isosceles triangular plate 31 presses the side rod 36 upward and stretches the lower spring 35, while driving the L-shaped plate 34 upward. This pushes the positioning rod 25 out of the L-shaped groove, and the sliding frame 24, which is released from positioning, is pulled to the right angle plate 29 by the elastic force of the reset spring 33. It then resets along with the U-shaped rod 28. After the L-shaped rod 9 resets, the U-shaped cover in the upper storage frame 6 falls down under its own weight. The lower electric telescopic cylinder 18 is then controlled to push the lower storage frame 11 to reset. The upper electric telescopic cylinder 16 is then controlled to drive the connecting plate 17 and the lower electromagnet rod 12 to move upward and reset. Then, the push plate 14 and the handle are moved by the elastic force of the push spring 15, and the handle is moved towards the discharge port. Finally, the upper storage frame 6 is moved to another welding position by controlling the transverse guide rail 4. The above operation is repeated to perform automatic positioning welding.
[0047] In summary, through the design of the above structure, after the U-shaped cover on the manhole cover is positioned and pushed in, the handle stored in the lower storage frame 11 can be automatically positioned and pushed to the designated welding position. Therefore, workers no longer need to spot weld the handle. Only the argon arc welding robotic arm 2 needs to be used to fully weld the positioned U-shaped cover and handle. After the welding is completed, the handle can be automatically removed, further improving the convenience of the device.
[0048] This invention covers any substitutions, modifications, equivalent methods and solutions made within the spirit and scope of this invention. In order to give the public a thorough understanding of this invention, specific details are described in detail in the preferred embodiments of this invention. However, those skilled in the art can fully understand this invention without these detailed descriptions. In addition, in order to avoid unnecessary confusion about the essence of this invention, well-known methods, processes, procedures, components and circuits are not described in detail.
[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be covered within the protection scope of the present invention.
Claims
1. A manhole cover welding device, characterized in that, The system includes a hanging rail (1), on which an argon arc welding robotic arm (2) is mounted. A clamping seat (3) is located below the hanging rail (1), and a transverse guide rail (4) is located next to the clamping seat (3). A bottom frame (5) is fixedly connected to the moving end of the transverse guide rail (4). An upper storage frame (6) for storing U-shaped covers is fixedly connected to the top of the bottom frame (5). A clamping mechanism (7) for clamping manhole covers is provided on the clamping seat (3). An outlet (8) is provided through the bottom of the upper storage frame (6) near the clamping seat (3). An L-shaped rod (9) is provided inside the outlet (8). The L-shaped rod (9) is fixedly connected to the side wall of the upper electromagnet (10). The bottom end of the L-shaped rod (9) is slidably connected to the inner side of the bottom frame (5). The bottom frame (5) is provided with a moving mechanism for driving the L-shaped rod (9) to move. The upper storage frame (6) is provided with a lower storage frame (11) for storing the handle on the side near the clamping seat (3). The lower storage frame (11) is provided with a lower electromagnet rod (12). The top of the L-shaped rod (9) and the upper electromagnet (10) are provided with a straight groove (13) that is adapted to the handle. A limiting mechanism for limiting the position of the handle is also provided.
2. The manhole cover welding equipment according to claim 1, characterized in that, The manhole cover is made of carbon steel, and the side wall of the upper electromagnet (10) is adapted to the inner side of the U-shaped cover.
3. The manhole cover welding equipment according to claim 1, characterized in that, A push plate (14) is slidably connected to the inner side of the lower storage frame (11). Three push springs (15) are fixedly connected at equal intervals between the side wall of the push plate (14) and the inner side of the lower storage frame (11). A push groove adapted to the handle is provided on the side of the push plate (14) near the lower electromagnet rod (12). A discharge port is provided at the bottom of the lower storage frame (11) below the lower electromagnet rod (12). An upper electric telescopic cylinder (16) is fixedly connected to the side wall of the lower storage frame (11). A connecting plate (17) is fixedly connected to the output end of the upper electric telescopic cylinder (16). The lower electromagnet rod (12) is fixedly connected to the bottom end of the connecting plate (17). A side plate (41) is fixedly connected to the side wall of the upper storage frame (6).
4. The manhole cover welding equipment according to claim 1, characterized in that, The top of the outlet (8) is provided with a side groove that is compatible with the lower storage frame (11). The lower storage frame (11) is longitudinally slidably connected to the inside of the side groove. The side wall of the upper storage frame (6) is fixedly connected with a lower electric telescopic cylinder (18). The output end of the lower electric telescopic cylinder (18) is fixedly connected to the top of the lower storage frame (11).
5. The manhole cover welding equipment according to claim 1, characterized in that, The moving mechanism includes a moving motor (19), and a lead screw (20) is rotatably connected to the inner side of the bottom frame (5). The moving motor (19) is fixedly connected to the side wall of the bottom frame (5). The output end of the moving motor (19) passes through the inner side of the bottom frame (5) and is fixedly connected to the side wall of the lead screw (20). The lead screw (20) is threadedly connected to the inner side wall of the L-shaped rod (9).
6. The manhole cover welding equipment according to claim 1, characterized in that, The clamping seat (3) is fixedly connected to a pair of support frames (21) on the side away from the upper storage frame (6), and the support frames (21) are located next to the handle of the manhole cover. The side walls of the support frames (21) are fixedly connected to side blocks (22) that are adapted to the outer wall of the U-shaped cover.
7. The manhole cover welding equipment according to claim 1, characterized in that, The limiting mechanism includes a limiting electric telescopic cylinder (23). The top of the L-shaped rod (9) has a top groove. The limiting electric telescopic cylinder (23) is fixedly connected to the bottom of the top groove. Cavities are opened on both sides of the straight groove (13). A sliding frame (24) is slidably connected between the bottom ends of the cavities. A pair of positioning rods (25) are slidably connected through the top of the sliding frame (24). The bottom end of the positioning rod (25) abuts against the bottom of the cavity. The top end of the positioning rod (25) extends out of the top end of the sliding frame (24). The cavity contains... Each side is laterally slidably connected to a rear block (26) for limiting the position of the handle. A rear spring (27) is fixedly connected between the side wall of the rear block (26) and the inner side of the cavity. A U-shaped rod (28) is fixedly connected to the output end of the limiting electric telescopic cylinder (23). A pair of right-angled plates (29) with inclined surfaces are fixedly connected to the inner side of the U-shaped rod (28). A lower plate (30) is fixedly connected to the side end of the U-shaped rod (28). An isosceles triangular plate (31) with inclined surfaces on both sides is fixedly connected to the side of the lower plate (30) that is far away from each other.
8. The manhole cover welding equipment according to claim 7, characterized in that, The inclined surface of the right-angle plate (29) is set on the opposite side, and the outer wall of the positioning rod (25) is in contact with the inclined surface of the right-angle plate (29). The top of the rear block (26) is fixedly connected with a rear rod (32), the bottom of the L-shaped rod (9) is fixedly connected with an L-shaped lower rod (37), and the inner side of the sliding frame (24) and the outer wall of the positioning rod (25) are fixedly connected with a positioning spring (43).
9. A manhole cover welding device according to claim 7, characterized in that, A reset spring (33) is fixedly connected between the side wall of the sliding frame (24) and the inner side of the cavity. A pair of L-shaped grooves are provided in the cavity. An L-shaped plate (34) is longitudinally slidably connected to the inner side of the L-shaped groove. Three lower springs (35) are fixedly connected between the bottom end of the L-shaped plate (34) and the bottom of the L-shaped groove. A side rod (36) is fixedly connected to the side wall of the L-shaped plate (34).
10. The manhole cover welding equipment according to claim 3, characterized in that, A fixed frame (38) is fixedly connected to the side wall of the lower storage frame (11) relative to the position next to the discharge port. A rod (39) is slidably connected through the side wall of the fixed frame (38), and the side wall of the rod (39) is set through the outer wall of the lower storage frame (11). A limit spring (40) is fixedly connected between the inner side of the fixed frame (38) and the outer wall of the rod (39). A groove (42) is opened on the side of the side plate (41) near the lower storage frame (11), and the bottom of the groove (42) is inclined. The side end of the rod (39) contacts the inner side of the groove (42), and the side end of the rod (39) is set as a smooth arc surface.