Steel fireproof door frame splicing and welding forming device

Abstract

The application discloses a steel fireproof door frame tailor-welding forming device and relates to the technical field of welding.The application is characterized in that a plurality of top rod mechanisms capable of being lifted flexibly are arranged in the workbench, so that a plurality of conductive rollers can form close and stable multi-point contact with the bottom surface or the side surface of the door frame profile, a uniform and reliable welding current loop grounding connection is constructed, and the problems of large contact resistance and uneven conduction caused by oxidation, pollution and poor flatness of the door frame in the traditional workbench table surface can be overcome, so that the stability of current and voltage in the welding process is effectively ensured, and meanwhile, the ejection of the top rod mechanism can also assist in positioning the door frame, so that the consistency and uniformity of the penetration of the welds of the reinforcing connecting pieces, the tailor-welding connecting strength and stability in the door frame welding process can be remarkably improved, and the quality of the tailor-welding process is improved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a steel fire door frame splicing and forming device. Background Technology

[0002] Steel fire doors are important passive fire protection facilities in building fire protection systems. Among them, the door frame, as the core load-bearing and sealing foundation component of steel fire doors, not only needs to meet the requirements of precise assembly dimensions, but also needs to have high strength and high stability structural characteristics. Therefore, the mainstream production process in the industry will weld multiple evenly distributed reinforcing connectors on the inside of the door frame profile for multi-point reinforcement. At present, the splicing and forming of fire door frames and the welding process of internal connector reinforcement are mostly completed in mass industrial production using general welding workbenches.

[0003] In actual production, current batch welding operations generally adopt a conductive method of grounding the entire welding table to the negative terminal. During operation, the door frame to be processed is simply laid flat on the workbench. Due to long-term operation, the welding workbench surface is prone to oxide layer, rust spots, dust accumulation, and welding residue, which easily causes uneven conductivity of the workbench surface. Furthermore, since the door frame is a thin-walled hollow steel component, its bottom contact surface has low flatness, resulting in weak and insufficient conductive contact between the door frame and the workbench. Consequently, during multi-point continuous welding, the unstable contact state causes continuous fluctuations in the welding circuit resistance, and the welding current and arc voltage cannot remain constant. This easily leads to quality problems such as incomplete welding, false welding, shallow penetration, uneven weld seam, and local missing welds during the welding of various reinforcing connectors. As a result, the welding strength of some connectors does not meet the standards, making it difficult to play an effective structural reinforcement role. Consequently, the overall rigidity of the door frame is insufficient, making it difficult to meet fire protection acceptance standards.

[0004] To address these issues, a steel fire door frame welding and forming device is proposed to solve some of the problems existing in the prior art. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that in the existing technology, during the welding process of fire door frames, the uneven conductivity of the general welding workbench and the poor grounding contact of the door frame profile lead to unstable welding circuits, which makes it easy for quality defects such as false welding, incomplete welding and insufficient penetration to occur during the welding process. Therefore, this invention proposes a steel fire door frame welding and forming device.

[0006] To address the problems existing in the prior art, the present invention adopts the following technical solution: A steel fire door frame welding and forming device includes a welding machine and a welding and forming table. The welding and forming table includes a support frame and a worktable fixedly installed on the top of the support frame. The top of the worktable has evenly distributed through holes. A lifting plate is lifted and lowered on the support frame. A first hydraulic cylinder for driving the lifting plate to lift and adjust is fixedly installed on the worktable. A push rod mechanism is movably inserted into the through holes and firmly connected to the top of the lifting plate. The push rod mechanism includes a metal push rod adapted to the size of the through holes, and a conductive roller is rotatably installed on the top of the metal push rod. The lower end of the metal push rod is connected to a first connecting rod, and the bottom end of the first connecting rod is fixedly installed on the lifting plate. An elastic buffer mechanism, an elastic torsion mechanism, and a self-locking mechanism are installed between the metal push rod and the first connecting rod. When the elastic buffer mechanism and the elastic torsion mechanism are activated, the self-locking mechanism releases the lock between the metal push rod and the first connecting rod.

[0007] Preferably, the elastic buffer mechanism includes an insertion hole opened inside the lower end of the metal top rod, a first connecting rod slidably inserted into the insertion hole, and a first spring elastically supported at the top end of the first connecting rod installed in the insertion hole.

[0008] Preferably, the elastic torsion mechanism includes a cylindrical cavity formed above the inner hole of the metal top rod, and a slip ring is movably installed in the cylindrical cavity. A vertically arranged slide rail is fixedly installed on the inner wall of the cylindrical cavity, and a slider fixedly connected to the slip ring is slidably installed in the slide rail. A second link is fixedly installed at the top of the first link, and the upper end of the second link movably passes through the interior of the slip ring in the cylindrical cavity. A torsion spring acting between the slip ring and the second link is sleeved on the outer side of the upper end of the second link.

[0009] Preferably, two torsion springs are provided, and the two torsion springs act in opposite directions on the circumferential elastic support between the slip ring and the second connecting rod. Under the condition of no external force, the metal push rod remains stable in the circumferential state under the elastic support of the two torsion springs.

[0010] Preferably, the self-locking mechanism includes a piston head fixedly installed on the upper end of the first connecting rod, and the outer dimensions of the piston head are adapted to the inner dimensions of the insertion hole. A circumferentially arranged annular groove is formed on the cylindrical surface of the piston head, and sealing rings are installed on the cylindrical surface of the piston head on the upper and lower sides of the annular groove. A circumferentially arranged annular spring is installed in the annular groove, and the outer wall of the annular spring is tightly attached to the inner wall of the insertion hole under its own elastic deformation support. A first oil passage is formed in the first connecting rod, which connects to the lower part of the annular spring in the annular groove, and a second oil passage is connected to the upper part of the annular spring in the annular groove. The first oil passage and the second oil passage are connected to the external hydraulic system.

[0011] Preferably, the grounding clamp of the welding machine is fixedly connected to the workbench, an insulating pad is fixedly installed between the support frame and the workbench, the first connecting rod is made of insulating material, and an elastic conductive mechanism is provided between the workbench and the metal top rod, and between the metal top rod and the conductive roller.

[0012] Preferably, the elastic conductive mechanism includes a metal shell fixedly installed at the bottom of the workbench, and a first conductive post vertically pointing to a corresponding metal push rod is slidably installed inside the metal shell. A second spring for elastically supporting the first conductive post is installed inside the metal shell. Under the elastic support of the second spring, the end of the first conductive post is tightly fitted with the metal push rod. A cavity located above the cylindrical cavity is opened inside the metal push rod, and a vertically arranged second conductive post is slidably inserted into the cavity. A third spring for elastically supporting the second conductive post is installed inside the cavity, and the end of the second conductive post is tightly fitted with a conductive roller under the elastic support of the third spring.

[0013] Preferably, the top front and rear sides of the workbench are provided with transverse through slots, and a conveying mechanism is provided in the through slots. The conveying mechanism includes a conveying frame fixedly installed on the top of the support frame. Conveying rollers are rotatably installed at both ends of the conveying frame. A conveyor belt is connected to the two conveying rollers through a common drive. A servo motor is fixedly installed on the conveying frame, and the servo motor is used to drive one of the conveying rollers to rotate.

[0014] Preferably, the conveyor roller is positioned below the through groove, a slide table is slidably mounted on the conveyor frame, another conveyor roller is rotatably connected to the slide table, a second hydraulic cylinder for driving the slide table to move laterally left and right is fixedly mounted on the conveyor frame, a lifting frame is lifted and lowered inside the conveyor frame, and multiple idler rollers evenly distributed at the bottom of the working section above the conveyor belt are rotatably mounted on the lifting frame, and a third hydraulic cylinder for driving the lifting frame to adjust its height is fixedly mounted on the support frame, and both the second and third hydraulic cylinders are externally connected to a hydraulic system.

[0015] Preferably, the second and third cylinders are controlled in a coordinated manner, the rod chamber of the third cylinder and the rod chamber of the second cylinder are connected by a pipeline, the third cylinder and the first cylinder are controlled in a coordinated manner, the rodless chamber of the first cylinder and the rodless chamber of the third cylinder are connected by a pipeline, and the rod chamber of the first cylinder is connected to an external hydraulic system.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, by setting multiple flexibly lifting and lowering top rod mechanisms inside the workbench, multiple conductive rollers can be simultaneously lifted onto the workbench surface, allowing the multiple conductive rollers to form a tight and stable multi-point contact with the bottom or side surface of the door frame profile. This is beneficial for constructing a uniform and reliable welding current loop grounding connection, and helps overcome the problems of high contact resistance and uneven conductivity caused by oxidation, contamination and poor flatness of the door frame itself in traditional workbench surfaces. This effectively ensures the stability of current and voltage during the welding process. At the same time, the lifting of the top rod mechanism can also assist in the positioning of the door frame. With the cooperation of both, the consistency and uniformity of the weld penetration of each reinforcing connector weld, as well as the weld strength and stability, can be significantly improved during the door frame welding process, which is beneficial to improving the quality of the welding process. 2. In this invention, by integrating the elastic buffer mechanism and the elastic torsion mechanism between the metal top rod and the first connecting rod in the top rod mechanism, the metal top rod can be compressed within a certain range in the vertical direction during the lifting process, and the metal top rod and the conductive roller at the top can adaptively deflect around the axis. This ensures that the conductive roller and the door frame surface achieve maximum contact area, which is beneficial to further optimize the grounding conductivity. At the same time, by setting the self-locking mechanism between the metal top rod and the first connecting rod, the metal top rod and the first connecting rod can be rigidly locked after adaptive adjustment, achieving precise positioning and anti-displacement of the door frame during the welding process, which is beneficial to improve the stability of the splicing and welding process. 3. In this invention, by linking and controlling the first, second, and third hydraulic cylinders, the lifting mechanism and the conveying mechanism can operate alternately and in coordination. This facilitates the automation of the door frame loading, positioning and tightening, and unloading processes after welding. This ensures a smooth connection of the entire welding process, significantly reduces the labor intensity of workers, and thus improves the production efficiency of door frame welding. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the welding and forming platform of the present invention; Figure 3 This is a perspective view of the support frame structure of the present invention; Figure 4 This is a perspective view of multiple push rod mechanisms of the present invention mounted on a lifting plate; Figure 5 This is a perspective view of the push rod mechanism and the elastic conductive mechanism of the present invention; Figure 6 This is an exploded view of the push rod mechanism of the present invention; Figure 7 This is an exploded view of the elastic buffer mechanism, elastic torsion mechanism, and self-locking mechanism of the present invention; Figure 8 This is an exploded view of the metal shell, the first conductive post, and the second spring of the present invention. Figure 9 This is a perspective view of the conveying mechanism of the present invention; Figure 10 This is an exploded view of the conveying mechanism of the present invention; Figure 11 This is a top view of the welding and forming platform of the present invention; Figure 12 For the present invention Figure 11 Sectional view at point AA; Figure 13 For the present invention Figure 12 Enlarged view of point D in the middle; Figure 14 For the present invention Figure 11 Sectional view at point BB; Figure 15 For the present invention Figure 14 Enlarged view at point E in the middle; Figure 16 For the present invention Figure 15 Enlarged view at point F; Figure 17 For the present invention Figure 15 Enlarged view of point G in the middle; Figure 18 For the present invention Figure 11 Sectional view at point CC.

[0018] In the picture: 1. Welding machine; 11. Welding torch; 2. Support frame; 21. Workbench; 22. Through hole; 23. Through slot; 3. Lifting plate; 31. First hydraulic cylinder; 4. Metal push rod; 41. Conductive roller; 42. First connecting rod; 43. Insertion hole; 44. First spring; 5. Cylindrical cavity; 51. Slip ring; 52. Slide rail; 53. Slider; 54. Second connecting rod; 55. Torsion spring; 6. Piston head; 61. Ring groove; 62. Sealing ring; 63. Annular spring; 64. First oil passage; 65. Second oil passage; 7. Metal shell; 71. First conductive post; 72. Second spring; 73. Chamber; 74. Second conductive post; 75. Third spring; 8. Conveyor frame; 81. Conveyor roller; 82. Conveyor belt; 83. Servo motor; 84. Slide table; 85. Second hydraulic cylinder; 86. Lifting frame; 87. Idler roller; 88. Third hydraulic cylinder. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Example: This example provides a steel fire door frame welding and forming device, see [link / reference]. Figure 1 - Figure 18Specifically, it includes a welding machine 1 and a welding forming table. The welding machine 1 is connected to a welding gun 11. The welding forming table includes a support frame 2 and a worktable 21 fixedly installed on the top of the support frame 2. The top of the worktable 21 has evenly distributed through holes 22. A lifting plate 3 is lifted and lowered on the support frame 2. A first hydraulic cylinder 31 for driving the lifting plate 3 to lift and adjust is fixedly installed on the worktable 21. A push rod mechanism is movably inserted into the through holes 22 and firmly connected to the top of the lifting plate 3. The push rod mechanism includes a metal push rod 4 that matches the size of the through holes 22. A conductive roller 41 is rotatably installed on the top of the metal push rod 4. The rotation axis of the conductive roller 41 is longitudinally arranged. The lower end of the metal push rod 4 is connected to a first connecting rod 42. The bottom end of the first connecting rod 42 is fixedly installed on the lifting plate 3. An elastic buffer mechanism, an elastic torsion mechanism, and a self-locking mechanism are installed between the metal push rod 4 and the first connecting rod 42. When the elastic buffer mechanism and the elastic torsion mechanism are activated, the self-locking mechanism releases the lock between the metal push rod 4 and the first connecting rod 42.

[0021] In this device, the welding forming table serves as the core tooling. The array of through holes 22 on the worktable 21 provides lifting space for the top rod mechanism. Through the extension and retraction adjustment of the first hydraulic cylinder 31, the lifting plate 3 can be driven to rise and fall as a whole, thereby driving all the top rod mechanisms to lift and fall synchronously. Through the lifting and falling drive of the top rod mechanism, multiple conductive rollers 41 can be simultaneously lifted onto the worktable 21, so that each conductive roller 41 can form a tight and stable multi-point contact with the bottom or side of the door frame profile lying flat on the worktable 21. This effectively constructs a uniform and reliable welding current loop grounding connection, which can effectively overcome the problems of high contact resistance and uneven conductivity caused by oxidation, contamination and poor flatness of the door frame itself in traditional worktables. This ensures the stability of current and voltage during welding, significantly improves the consistency, uniformity and connection strength of the weld depth of each reinforcing connector, and helps to eliminate quality defects such as false welding and spurious welding. This effectively ensures that the overall structural strength of the door frame after welding meets fire protection standards.

[0022] In the specific implementation process, such as Figure 6 - Figure 7 , Figure 13 and Figure 15As shown, the elastic buffer mechanism includes an insertion hole 43 opened inside the lower end of the metal top rod 4. The first connecting rod 42 is slidably inserted into the insertion hole 43. A first spring 44 elastically supported at the top of the first connecting rod 42 is installed in the insertion hole 43. In this device, when the conductive roller 41 contacts the door frame and continues to be subjected to the lifting force, if there is a height difference between the contact surfaces, the first connecting rod 42 can slide relative to the insertion hole 43 of the metal top rod 4 to compress the first spring 44 inside, so that the lifting stroke of the metal top rod 4 can adapt to the local height. This helps to avoid door frame deformation or poor contact due to excessive lifting force at individual points. Furthermore, through adaptive balance adjustment, each metal top rod 4 can evenly distribute the lifting force, which helps to improve the stability of the device during operation.

[0023] In the specific implementation process, such as Figure 6 - Figure 7 , Figure 13 and Figure 15 - Figure 16 As shown, the elastic torsion mechanism includes a cylindrical cavity 5 opened above the insertion hole 43 in the metal top rod 4, and a slip ring 51 is movably installed in the cylindrical cavity 5. A vertically arranged slide rail 52 is fixedly installed on the inner wall of the cylindrical cavity 5, and a slider 53 fixedly connected to the slip ring 51 is slidably installed in the slide rail 52. A second connecting rod 54 is fixedly installed at the top of the first connecting rod 42, and the upper end of the second connecting rod 54 movably passes through the interior of the slip ring 51 in the cylindrical cavity 5. A torsion spring 55 acting between the slip ring 51 and the second connecting rod 54 is sleeved on the outer side of the upper end of the second connecting rod 54.

[0024] In this device, within the elastic torsion mechanism, through the cooperation of the slip ring 51, the slider 53, and the slide rail 52, and connected by the torsion spring 55, the metal top rod 4 can only rotate in a limited circumferential direction relative to the second connecting rod 54, that is, the metal top rod 4 can only rotate in a limited circumferential direction relative to the first connecting rod 42. When the top rod mechanism rises, and the conductive roller 41 contacts the door frame profile with an inclined or curved surface, the conductive roller 41 and the metal top rod 4, guided by the inclined or curved surface, can overcome the elastic resistance provided by the torsion spring 55 and deflect, allowing the wheel surface of the conductive roller 41 to better fit against the surface of the door frame profile. Then, with the locking of the self-locking mechanism, the metal top rod 4 and the conductive roller 41 can stably maintain their deflected state during the welding process. After the welding is completed, once the external force is removed, under the action of the torsion spring 55, the metal top rod 4 and the conductive roller 41 can automatically return to their initial state, which helps to ensure the stability and smoothness of the device during cyclic operation.

[0025] In the specific implementation process, such as Figure 7 and Figure 16As shown, there are two torsion springs 55. The two torsion springs 55 act in opposite directions on the circumferential elastic support between the slip ring 51 and the second connecting rod 54. Under the condition of no external force, the metal push rod 4 remains stable in the circumferential state under the elastic support of the two torsion springs 55. In this device, the two torsion springs 55 with opposite directions of rotation can provide a balanced reset torque, which can further improve the reset stability of the metal push rod 4 and the conductive roller 41 when the external force is removed during the operation of the device.

[0026] In the specific implementation process, such as Figure 6 - Figure 7 , Figure 13 and Figure 17 As shown, the self-locking mechanism includes a piston head 6 fixedly installed on the upper end of the first connecting rod 42, and the outer dimensions of the piston head 6 are adapted to the inner dimensions of the insertion hole 43. A circumferentially arranged annular groove 61 is formed on the cylindrical surface of the piston head 6. Sealing rings 62 are installed on the cylindrical surface of the piston head 6 on the upper and lower sides of the annular groove 61. The annular groove 61 cooperates with the inner wall of the insertion hole 43, and under the restriction of the upper and lower sealing rings 62, a relatively closed sealing cavity is formed. A circumferentially arranged annular spring piece 63 is installed in the annular groove 61, and the outer wall of the annular spring piece 63 is tightly attached to the inner wall of the insertion hole 43 under its own elastic deformation support. A first oil passage 64 is opened in the first connecting rod 42, which is connected to the lower part of the annular spring piece 63 in the annular groove 61, and a second oil passage 65 is connected to the upper part of the annular spring piece 63 in the annular groove 61. The first oil passage 64 and the second oil passage 65 are connected to the external hydraulic system.

[0027] In this device, under hydraulic control, the self-locking mechanism can flexibly lock and release the metal push rod 4 and the first connecting rod 42. When the push rod mechanism is controlled to rise, the hydraulic system can inject oil into the annular spring 63 in the annular groove 61 through the first oil passage 64, and simultaneously inject oil from above the annular spring 63 in the annular groove 61 through the second oil passage 65. This allows hydraulic oil to fill the space between the annular spring 63 and the inner wall of the insertion hole 43, releasing the frictional locking between the annular spring 63 and the inner wall of the insertion hole 43. In this state, The metal push rod 4 can slide and rotate relative to the first connecting rod 42. When it is necessary to lock the metal push rod 4 and the first connecting rod 42, the hydraulic system stops the high-pressure oil supply operation to the first oil passage 64 and simultaneously stops the high-pressure oil supply operation to the second oil passage 65. After the pressure is released, the outer side of the annular spring 63 is pressed tightly against the inner wall of the insertion hole 43 again by means of the elastic rebound of the annular spring 63, generating a huge static friction force, thereby rigidly locking the first connecting rod 42 and the metal push rod 4, and realizing the fixed maintenance of the position and attitude of the metal push rod 4.

[0028] In this device, the sealing ring 62 can be a metal piston ring, which effectively achieves the connection sealing between the insertion hole 43 and the piston head 6. In this device, after the contact state between the conductive roller 41 and the door frame is determined, the self-locking mechanism is controlled to complete the locking operation, which rigidly locks the metal top rod 4 and the first connecting rod 42. This can maintain a stable contact pressure during the welding process, thereby achieving the function of fixing the position of the door frame. This not only ensures the stability of the welding circuit, but also plays a role in accurately positioning the door frame and preventing displacement during the welding process, which is conducive to further improving the quality of the welded product.

[0029] In the specific implementation process, such as Figure 5 - Figure 6 , Figure 8 , Figure 13 and Figure 15 As shown, the grounding clamp of welding machine 1 is fixedly connected to workbench 21. An insulating pad is fixedly installed between support frame 2 and workbench 21. The first connecting rod 42 is made of insulating material. An elastic conductive mechanism is provided between workbench 21 and metal top rod 4, and between metal top rod 4 and conductive roller 41. The elastic conductive mechanism includes a metal shell 7 fixedly installed at the bottom of workbench 21. A first conductive post 71 vertically pointing to the corresponding metal top rod 4 is slidably installed in the metal shell 7. A second spring 72 is installed in the metal shell 7 to elastically support the first conductive post 71. The end of the first conductive post 71 under the elastic support of the second spring 72 is tightly fitted with the metal top rod 4. A chamber 73 located above the cylindrical cavity 5 is opened in the metal top rod 4. A vertically arranged second conductive post 74 is slidably inserted in the chamber 73. A third spring 75 is installed in the chamber 73 to elastically support the second conductive post 74. The end of the second conductive post 74 under the elastic support of the third spring 75 is tightly fitted with the conductive roller 41.

[0030] In this device, by setting an elastic conductive mechanism consisting of a metal shell 7, a first conductive post 71, and a second spring 72 between the worktable 21 and the metal push rod 4, and setting another elastic conductive mechanism consisting of a second conductive post 74 and a third spring 75 between the metal push rod 4 and the conductive roller 41, a continuous, reliable, and pressure-compensated conductive path can be constructed from the worktable 21 to the conductive roller 41. In this structure, the second spring 72 and the third spring 75 can respectively ensure tight electrical contact between the first conductive post 71 and the metal push rod 4, and between the second conductive post 74 and the conductive roller 41, so that even if there is a small vibration or displacement between the two, stable conductivity can be maintained, which is beneficial to further ensure the quality of the welding circuit.

[0031] In the specific implementation process, such as Figure 3 and Figure 9 - Figure 11As shown, the top front and rear sides of the workbench 21 are provided with horizontally arranged through slots 23. A conveying mechanism is provided in the through slots 23, and the conveying mechanism includes a conveying frame 8 fixedly installed on the top of the support frame 2. Conveying rollers 81 are rotatably installed at both ends of the conveying frame 8. A conveyor belt 82 is connected to the two conveying rollers 81 through a common drive. A servo motor 83 is fixedly installed on the conveying frame 8, and the servo motor 83 is used to drive one of the conveying rollers 81 to rotate. In this device, after the servo motor 83 is powered on and started, it can drive the conveying roller 81 connected to its drive shaft to rotate, thereby driving the conveyor belt 82 to rotate and convey. By setting the conveying mechanism on the front and rear sides of the workbench 21, the automated loading and unloading operation of the door frame profile splicing and welding process can be realized, which helps to reduce the labor burden of the workers and thus improves the efficiency of the splicing and welding process.

[0032] In the specific implementation process, such as Figure 2 , Figure 9 - Figure 10 and Figure 18 As shown, the conveyor roller 81 is located in the lower part of the through groove 23. A slide table 84 is slidably mounted on the conveyor frame 8. Another conveyor roller 81 is rotatably connected to the slide table 84. A second hydraulic cylinder 85 for driving the slide table 84 to move laterally left and right is fixedly mounted on the conveyor frame 8. A lifting frame 86 is installed inside the conveyor frame 8, and multiple idler rollers 87 evenly distributed at the bottom of the working section above the conveyor belt 82 are rotatably mounted on the lifting frame 86. A third hydraulic cylinder 88 for driving the lifting frame 86 to adjust its height is fixedly mounted on the support frame 2. Both the second hydraulic cylinder 85 and the third hydraulic cylinder 88 are externally connected to a hydraulic system.

[0033] In this device, the sliding table 84 can be moved left and right by the extension and retraction control of the second hydraulic cylinder 85, thereby adjusting the distance between the two corresponding conveyor rollers 81 on the left and right, and realizing the operation of tensioning or loosening the conveyor belt 82. The lifting frame 86 and the idler roller 87 can be driven to rise and fall by the extension and retraction control of the third hydraulic cylinder 88. With the cooperation of the two, it is possible to control whether the working section of the conveyor belt 82 is hidden in the lower part of the through groove 23 or is lifted onto the table 21 to support and convey the door frame. Through this flexible conveying mechanism, the conveyor belt 82 can be lowered to avoid obstacles during welding processing, and can be raised to perform conveying tasks during loading and unloading. The two do not interfere with each other, which helps to improve the operational stability of the device.

[0034] In the specific implementation process, the second cylinder 85 and the third cylinder 88 are linked and controlled. The rod chamber of the third cylinder 88 and the rod chamber of the second cylinder 85 are connected through a pipe and a matching valve group. The third cylinder 88 and the first cylinder 31 are linked and controlled. The rodless chamber of the first cylinder 31 and the rodless chamber of the third cylinder 88 are connected through a pipe and a matching valve group. The rod chamber of the first cylinder 31 is connected to an external hydraulic system. In this device, through the linked control of the second cylinder 85 and the third cylinder 88, the third cylinder 88 is extended. Then, the lifting frame 86 is operated to drive the idler roller 87 to lift upward, pushing the working section of the conveyor belt 82 upward. When it protrudes from the top of the worktable 21 through the through groove 23, the second cylinder 85 can be controlled to retract synchronously, pulling the slide table 84 to drive the conveyor roller 81 mounted on it to move closer to the other side of the conveyor roller 81, so that when conveying the door frame, the working section of the conveyor belt 82 can protrude upward.

[0035] During welding, the working section of the conveyor belt 82 can be smoothly retracted and hidden in the through groove 23. Through the linkage control of the third cylinder 88 and the first cylinder 31, the first cylinder 31 is extended. When the lifting plate 3 drives multiple push rod mechanisms to rise and protrude from the top of the worktable 21, the third cylinder 88 can be controlled to retract. That is, when the first cylinder 31 extends, the third cylinder 88 retracts and the second cylinder 85 extends; when the first cylinder 31 retracts, the third cylinder 88 extends and the second cylinder 85 retracts. This allows the push rod mechanism and the conveying mechanism to work alternately and in coordination, effectively automating the process of loading, lifting, grounding, and unloading the door frame, which is beneficial to significantly improving the efficiency of welding production.

[0036] Specifically, the working principle of this invention is as follows: In the initial state, the device is in the material preparation state. The first hydraulic cylinder 31 retracts, so that the lifting plate 3 and all the top rod mechanisms are in the lowest position. In this state, the conductive roller 41 at the top of the metal top rod 4 is below the table surface of the worktable 21. At the same time, the third hydraulic cylinder 88 is in the extended state, so that the lifting frame 86 and the idler roller 87 lift the working section of the conveyor belt 82, so that the working section of the conveyor belt 82 is slightly higher than the table surface of the worktable 21. The second hydraulic cylinder 85 is in the retracted state, so that the conveyor belt 82 maintains appropriate tension. Then, the servo motor 83 starts, driving the conveyor roller 81 to drive the conveyor belt 82 to rotate continuously, conveying multiple door frame profiles to be welded and laying them flat on the worktable 21.

[0037] After multiple door frame profiles are in place, the conveying mechanism stops rotating and changes state. At this time, the third hydraulic cylinder 88 begins to retract, driving the lifting frame 86 and the idler roller 87 to descend. The working section of the conveyor belt 82 then descends into the through groove 23, making the working section of the conveyor belt 82 lower than the table surface of the worktable 21. The door frame profile then falls stably onto the worktable 21. Simultaneously, the second hydraulic cylinder 85 extends, pushing the slide table 84 to move, increasing the distance between the two conveying rollers 81, and continuing to maintain the stability of the tensioned state of the conveyor belt 82.

[0038] When the conveying mechanism switches states, the piston rod of the first hydraulic cylinder 31 extends synchronously, pushing the lifting plate 3 upward, which in turn drives all the push rod mechanisms to rise synchronously, causing the metal push rod 4 to extend from the through hole 22. The conductive roller 41 at the top of the metal push rod 4 can contact the bottom or side of the door frame profile during the upward process. During the upward process, the self-locking mechanism first releases the lock between the metal push rod 4 and the first connecting rod 42. At the moment of contact, the elastic buffer mechanism and the elastic torsion mechanism can be automatically activated. Each metal push rod 4 adaptively performs a small adjustment based on the local height and angle of its corresponding contact point. The extension and deflection of the rollers allow all the conductive rollers 41 to fit well against the door frame surface. Once all the top rods are in place and in stable contact with the door frame, the self-locking mechanism is controlled to relock the metal top rods 4 and the first connecting rod 42, achieving stable and precise positioning of the door frame profile. At the same time, the elastic conductive mechanism ensures that the grounding current of the workbench 21 is stably transmitted to each conductive roller 41, thereby establishing a multi-point uniform and reliable welding grounding circuit. With the guarantee of a stable current circuit, workers can perform high-quality multi-point welding of the door frame and the internal reinforcing connectors.

[0039] After welding is completed, the device is switched back to its initial state. The steel fire door frame that has been welded together is smoothly unloaded by the conveying mechanism, and then the next work cycle begins. Through the linkage control of each hydraulic cylinder, the entire process can achieve efficient and smooth automated operation.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A steel fire door frame splicing and forming device, comprising a welding machine (1) and a splicing and forming table, characterized in that: The welding and forming platform includes a support frame (2) and a worktable (21) fixedly installed on the top of the support frame (2). The top of the worktable (21) has evenly distributed through holes (22). A lifting plate (3) is installed on the support frame (2). A first hydraulic cylinder (31) for driving the lifting plate (3) to adjust its height is fixedly installed on the worktable (21). A push rod mechanism that is firmly connected to the top of the lifting plate (3) is movably inserted into the through holes (22). The push rod mechanism includes a ruler that fits into the through holes (22). A metal top rod (4) with a size-fitting shape is provided, and a conductive roller (41) is rotatably mounted on the top of the metal top rod (4). The lower end of the metal top rod (4) is connected to a first connecting rod (42), and the bottom end of the first connecting rod (42) is fixedly mounted on the lifting plate (3). An elastic buffer mechanism, an elastic torsion mechanism, and a self-locking mechanism are installed between the metal top rod (4) and the first connecting rod (42). When the elastic buffer mechanism and the elastic torsion mechanism are activated, the self-locking mechanism releases the lock between the metal top rod (4) and the first connecting rod (42).

2. The steel fire door frame welding and forming device according to claim 1, characterized in that: The elastic buffer mechanism includes an insertion hole (43) opened inside the lower end of the metal top rod (4), the first connecting rod (42) is slidably inserted into the insertion hole (43), and a first spring (44) elastically supported at the top of the first connecting rod (42) is installed in the insertion hole (43).

3. The steel fire door frame welding and forming device according to claim 1, characterized in that: The elastic torsion mechanism includes a cylindrical cavity (5) opened above the insertion hole (43) in the metal top rod (4), and a slip ring (51) is movably installed in the cylindrical cavity (5). A vertically arranged slide rail (52) is fixedly installed on the inner wall of the cylindrical cavity (5), and a slider (53) fixedly connected to the slip ring (51) is slidably installed in the slide rail (52). A second connecting rod (54) is fixedly installed at the top of the first connecting rod (42), and the upper end of the second connecting rod (54) movably passes through the interior of the slip ring (51) in the cylindrical cavity (5). A torsion spring (55) acting between the slip ring (51) and the second connecting rod (54) is sleeved on the outer side of the upper end of the second connecting rod (54).

4. The steel fire door frame welding and forming device according to claim 3, characterized in that: There are two torsion springs (55). The two torsion springs (55) act in opposite directions on the circumferential elastic support between the slip ring (51) and the second connecting rod (54). When not subjected to external force, the metal top rod (4) remains stable in the circumferential state under the elastic support of the two torsion springs (55).

5. The steel fire door frame welding and forming device according to claim 1, characterized in that: The self-locking mechanism includes a piston head (6) fixedly installed on the upper end of the first connecting rod (42), and the outer dimensions of the piston head (6) are adapted to the inner dimensions of the insertion hole (43). A ring groove (61) is provided on the cylindrical surface of the piston head (6). Sealing rings (62) are installed on the cylindrical surface of the piston head (6) on the upper and lower sides of the ring groove (61). A ring spring (63) is installed in the ring groove (61), and the outer wall of the ring spring (63) is tightly attached to the inner wall of the insertion hole (43) under its own elastic deformation support. A first oil passage (64) is provided in the first connecting rod (42) and communicates with the ring spring (63) below the ring spring (63) in the ring groove (61), and a second oil passage (65) is provided in the ring groove (61) above the ring spring (63). The first oil passage (64) and the second oil passage (65) are connected to the hydraulic system.

6. The steel fire door frame welding and forming device according to claim 1, characterized in that: The grounding clamp of the welding machine (1) is fixedly connected to the workbench (21). An insulating pad is fixedly installed between the support frame (2) and the workbench (21). The first connecting rod (42) is made of insulating material. An elastic conductive mechanism is provided between the workbench (21) and the metal top rod (4), and between the metal top rod (4) and the conductive roller (41).

7. The steel fire door frame welding and forming device according to claim 6, characterized in that: The elastic conductive mechanism includes a metal shell (7) fixedly installed at the bottom of the workbench (21), and a first conductive post (71) vertically pointing to the corresponding metal push rod (4) is slidably installed in the metal shell (7). A second spring (72) for elastically supporting the first conductive post (71) is installed in the metal shell (7). The end of the first conductive post (71) under the elastic support of the second spring (72) is tightly fitted with the metal push rod (4). A cavity (73) located above the cylindrical cavity (5) is opened in the metal push rod (4), and a vertically arranged second conductive post (74) is slidably inserted in the cavity (73). A third spring (75) for elastically supporting the second conductive post (74) is installed in the cavity (73). The end of the second conductive post (74) under the elastic support of the third spring (75) is tightly fitted with the conductive roller (41).

8. The steel fire door frame welding and forming device according to claim 1, characterized in that: The workbench (21) has horizontally arranged through slots (23) on both the front and rear sides of the top. A conveying mechanism is provided in the through slots (23), and the conveying mechanism includes a conveying frame (8) fixedly installed on the top of the support frame (2). Conveying rollers (81) are rotatably installed at both ends of the conveying frame (8). A conveyor belt (82) is connected to the two conveying rollers (81) through a common drive. A servo motor (83) is fixedly installed on the conveying frame (8), and the servo motor (83) is used to drive one of the conveying rollers (81) to rotate.

9. The steel fire door frame welding and forming device according to claim 8, characterized in that: The conveying roller (81) is located below the through groove (23). A slide table (84) is slidably mounted on the conveying frame (8). Another conveying roller (81) is rotatably connected to the slide table (84). A second hydraulic cylinder (85) for driving the slide table (84) to move laterally left and right is fixedly mounted on the conveying frame (8). A lifting frame (86) is installed inside the conveying frame (8). Multiple idler rollers (87) evenly distributed at the bottom of the working section above the conveyor belt (82) are rotatably mounted on the lifting frame (86). A third hydraulic cylinder (88) for driving the lifting frame (86) to adjust its height is fixedly mounted on the support frame (2). Both the second hydraulic cylinder (85) and the third hydraulic cylinder (88) are externally connected to a hydraulic system.

10. A steel fire door frame welding and forming device according to claim 9, characterized in that: The second cylinder (85) and the third cylinder (88) are linked and controlled. The rod chamber of the third cylinder (88) and the rod chamber of the second cylinder (85) are connected by a pipe. The third cylinder (88) and the first cylinder (31) are linked and controlled. The rodless chamber of the first cylinder (31) and the rodless chamber of the third cylinder (88) are connected by a pipe. The rod chamber of the first cylinder (31) is connected to an external hydraulic system.

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