Rapid welding and positioning tool for steel reinforcement framework in civil air defense door leaf

Abstract

The invention discloses a rapid welding and positioning tool for a steel reinforcement framework in a civil air defense door leaf, and belongs to the technical field of welding. Comprising a clamping assembly. The lifting assemblies comprise lifting frames, second threaded rods are connected to the lifting frames in a threaded mode, a plurality of guide pipes are installed on the lifting frames, threaded pipes are installed on the guide pipes, adjusting heads are connected to the threaded pipes in a threaded mode, and limiting mechanisms are rotationally installed on the adjusting heads; the multiple adjusting assemblies comprise lifting rods, two sets of arc-shaped rods are rotationally installed on the lifting rods, and fixing blocks are installed on the two sides of the arc-shaped rods. The free ends of the two arc-shaped rods pre-tightened by the torsional springs are locked, so that preliminary supporting and positioning of the reinforcing steel bars can be completed, the adjusting assembly and the lifting assembly are matched to drive all the pre-positioned reinforcing steel bars to synchronously and integrally ascend and descend, and all the reinforcing steel bars of the whole layer can be accurately pressed or jacked to the designed positions of an inner groove of a civil air defense door leaf frame at a time; displacement of the reinforcing steel bars is limited, no displacement risk exists in the welding process, and the operation difficulty of aligning and welding the reinforcing steel bars is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and more specifically, to a rapid welding and positioning fixture for the steel reinforcement skeleton inside a civil defense door. Background Technology

[0002] Civil defense doors are the core protective components of civil defense projects. They need to have extremely high structural strength and impact resistance to meet wartime protection requirements. Therefore, steel reinforcement frames are laid inside civil defense doors as load-bearing support structures. The layout accuracy and welding quality of the steel reinforcement frames directly determine the overall protective performance of civil defense doors.

[0003] Currently, the welding of steel reinforcement frames for civil defense doors commonly employs a positioning method using slotted positioning plates. This involves pre-welding multiple positioning plates with fixed slots onto the side of the door frame, placing the steel reinforcement bars one by one into their corresponding slots, aligning them to their preset positions, and then proceeding with the subsequent welding. This method requires the positioning plates to be pre-welded to the door frame, and after welding, the plates must be cut and removed, and the weld marks on the door frame must be ground away, making the disassembly and assembly process cumbersome. Furthermore, the fixed slots are open structures, meaning the steel reinforcement bars are only supported on one side. During welding, the bars are susceptible to displacement and detachment due to welding vibrations and external forces, requiring repeated adjustments by operators, significantly increasing the difficulty of the welding operation and making it difficult to guarantee the accuracy of the steel reinforcement arrangement. Therefore, this paper proposes a rapid welding positioning fixture for the steel reinforcement frames inside civil defense doors. Summary of the Invention

[0004] The purpose of this invention is to provide a rapid welding and positioning fixture for the steel reinforcement skeleton inside the door leaf of a civil defense door, which solves the technical problem of the difficulty in positioning and welding the steel reinforcement inside the door leaf frame.

[0005] This invention provides a quick welding and positioning fixture for the steel reinforcement skeleton inside a civil defense door, including several clamping components clamped around the periphery of the door frame;

[0006] A plurality of lifting components, including a lifting frame slidably mounted on a clamping assembly, a second threaded rod screwed onto the lifting frame, the second threaded rod being rotatably connected to the clamping assembly, a plurality of guide tubes mounted on the lifting frame, threaded tubes mounted on the guide tubes, adjusting heads screwed onto the threaded tubes, and a limit mechanism rotatably mounted on the adjusting heads;

[0007] Several adjustment components, including several lifting rods slidably connected to the guide tube, with two sets of arc-shaped rods rotatably mounted on the lifting rods, and fixed blocks installed on both sides of the arc-shaped rods;

[0008] The reinforcing bar is inserted between the two sets of arc-shaped rods. The adjusting head is rotated, which drives the limiting mechanism to insert between the two fixed blocks, locking the free ends of the two sets of arc-shaped rods. The lifting assembly drives the arc-shaped rods to rise and fall, fixing the reinforcing bar in the inner groove of the door frame.

[0009] As a further description of the above technical solution, the adjustment assembly also includes a connecting frame, on which a third threaded rod is screwed. The third threaded rod is rotatably connected to the lifting frame, and the lifting rod is installed on the connecting frame. The limiting mechanism is slidably connected to the lifting rod.

[0010] As a further description of the above technical solution, the guide tubes are distributed at equal intervals, and the threaded tubes are coaxial with the guide tubes.

[0011] As a further description of the above technical solution, several lifting rods are coaxial with the guide tube and are positioned correspondingly. The lifting rods are slidably connected to the guide tube and pass through the guide tube and the threaded tube.

[0012] As a further description of the above technical solution, a torsion spring is provided at the connecting shaft of the arc-shaped rod.

[0013] As a further description of the above technical solution, the inner side of the arc-shaped rod is provided with a slope.

[0014] As a further description of the above technical solution, the limiting mechanism includes a connecting ring rotatably mounted on the adjusting head, a guide frame mounted on the connecting ring, and a limiting block mounted on the guide frame.

[0015] As a further description of the above technical solution, the clamping assembly includes a fixed frame, a base plate mounted on the fixed frame, and several clamping plates slidably mounted on the fixed frame. A first threaded rod is screwed onto the clamping plate, and the first threaded rod is rotatably connected to the fixed frame.

[0016] By adopting the above technical solution, the bottom of the air-raid shelter door frame is raised, so that a gap greater than the thickness of the base plate is formed between the bottom surface of the air-raid shelter door frame and the working surface, providing reserved installation space for the base plate of the clamping components.

[0017] Four sets of clamping components are installed around the door frame. The base plate of the clamping component is horizontally inserted into the receiving gap on the bottom surface of the air-raid shelter door frame, so that the inner side wall of the fixing frame fits against the outer side wall of the air-raid shelter door frame. The first threaded rod is rotated to drive the clamping plate to feed along the fixing frame towards the air-raid shelter door frame until the clamping plate and the base plate cooperate to clamp the edge of the air-raid shelter door frame. The second threaded rod is rotated to drive the lifting frame to move vertically along the guide rod and adjust it to the initial working position that matches the height of the air-raid shelter door frame. The four sides of the door frame are arranged in sequence to complete the rigid fixation of the tooling.

[0018] Manually pry open the two sets of arc rods to overcome the preload of the torsion spring, and insert the ends of the longitudinal steel bars to be welded into the two sets of arc rods at the corresponding positions of the four sets of tooling. Release the arc rods so that they are reset under the action of the torsion spring. The free ends of the two arc rods abut against each other to form a support hole to support the steel bars. Rotate the adjusting head to drive the connecting ring and guide frame to descend, so that the limiting block is inserted into the limiting groove formed by the two fixed blocks. The arc rods cannot be rotated and opened due to the limiting action of the limiting block.

[0019] After several parallel reinforcing bars have been placed, the second threaded rod is slightly rotated to drive the lifting frame to move, thereby causing the lifting assembly, adjusting assembly, and arc rod to descend synchronously until the reinforcing bars abut against the bottom of the inner groove of the door frame. At the same time, the bottom of the lifting rod abuts against the reinforcing bars to keep them stable. Similarly, the transverse reinforcing bars are laid in the same way, and by rotating the corresponding second threaded rod, the transverse reinforcing bars are controlled to overlap with the longitudinal reinforcing bars to complete the laying of the reinforcing bars in the same layer. The connection points between the reinforcing bars and between the reinforcing bars and the door frame are welded by a robotic arm or manually to complete the laying of the bottom frame.

[0020] After the bottom layer of reinforcing bars is welded, first rotate the second threaded rod to raise the lifting assembly and the adjusting assembly. After the lifting rod rises, its bottom separates from the reinforcing bar, which remains between the two arc-shaped rods. Then rotate the third threaded rod to lower the connecting frame, which in turn lowers the lifting rod, the arc-shaped rod, and the fixing block. The limiting block and the fixing block separate, releasing the circumferential lock of the arc-shaped rod. Rotate the second threaded rod again to adjust the lifting frame upwards to the upper layer of reinforcing bar loading position. As the arc-shaped rod rises, the reinforcing bar contacts the inclined surface, forcing the arc-shaped rod to rotate and open, thus achieving rapid separation between the arc-shaped rod and the reinforcing bar. After the arc-shaped rod and the reinforcing bar separate, rotate the third threaded rod to insert the limiting block back into the space between the two fixing blocks, resetting the limiting block. Following the loading method of the lower layer of reinforcing bars, pre-place all the upper layer of transverse reinforcing bars in the corresponding arc-shaped rod support holes. Rotate the adjusting head again to insert the limiting block into the limiting groove and lock the arc-shaped rod.

[0021] The difference between laying the upper and lower layers of reinforcing bars lies only in the rotation of the second threaded rod, which controls the longitudinal reinforcing bars to move upward and abut against the top of the inner groove of the door frame. The free end of the locked and closed arc rod limits the bottom of the longitudinal reinforcing bars, while the transverse reinforcing bars are located at the bottom of the longitudinal reinforcing bars. Therefore, the transverse reinforcing bars are laid first, and then the longitudinal reinforcing bars are laid and fixed. The transverse reinforcing bars are moved upward so that they abut against the bottom of the longitudinal reinforcing bars, and the connection points are welded to complete the welding and fixing of the double-layer frame.

[0022] After all the steel bar welding work is completed, rotate the first threaded rod in the opposite direction to release the clamping effect of the clamping plate on the air-raid shelter door frame, and pull the bottom plate out of the receiving gap at the bottom of the air-raid shelter door frame. This completes the disassembly of the tooling and allows it to be transferred to the next air-raid shelter door frame for reuse.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] 1. This invention achieves initial support and positioning of reinforcing bars by locking the free ends of two pre-tightened arc-shaped rods with torsion springs, eliminating the need for continuous manual support. Then, through the coordination of the adjustment and lifting components, all pre-positioned reinforcing bars are simultaneously raised and lowered as a whole. This allows for the precise pressing or support of all reinforcing bars in an entire floor to the designed position within the inner groove of the air-raid shelter door frame in one go. After positioning, the arc-shaped rods are in a circumferentially locked state, completely restricting the vertical and lateral displacement of the reinforcing bars. There is no risk of displacement during welding, significantly reducing the difficulty of rebar alignment and welding, and significantly improving positioning accuracy.

[0025] 2. This invention eliminates the need for manual unlocking of each arc-shaped rod. Instead, by adjusting the component to release the circumferential lock of the arc-shaped rod, the lifting component is controlled to rise. The welded and fixed steel bars can then automatically push open the arc-shaped rod along the inclined surface inside the rod to achieve batch unloading. The unloading process does not require external force to contact the welded steel bar skeleton, greatly improving unloading efficiency and significantly reducing the intensity of manual operation, thus meeting the needs of batch processing scenarios. Attached Figure Description

[0026] Figure 1 This is an installation diagram of a quick welding and positioning fixture for the steel reinforcement frame inside a civil defense door, as disclosed in a preferred embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the clamping assembly connection structure of a quick welding positioning tool for the steel reinforcement skeleton inside a civil defense door leaf, as disclosed in a preferred embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of a guide tube structure for a rapid welding and positioning fixture for the steel reinforcement skeleton inside a civil defense door, as disclosed in a preferred embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of a lifting component of a rapid welding and positioning fixture for the steel reinforcement skeleton inside a civil defense door, as disclosed in a preferred embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of an arc-shaped rod connection structure for a rapid welding and positioning fixture for the steel reinforcement skeleton inside a civil defense door, as disclosed in a preferred embodiment of the present invention.

[0031] Figure 6 This invention discloses a rapid welding and positioning fixture for the steel reinforcement frame inside a civil defense door, as a preferred embodiment. Figure 3 Enlarged view of point A in the middle;

[0032] Figure 7This invention discloses a preferred embodiment of a lower layer steel bar limiting diagram for a rapid welding and positioning fixture for the steel bar skeleton inside a civil defense door.

[0033] Figure 8 This invention discloses a preferred embodiment of a quick welding and positioning fixture for the inner steel reinforcement frame of a civil defense door, showing the upper steel reinforcement limit diagram.

[0034] The following are the labels in the diagram: 1. Clamping assembly; 2. Lifting assembly; 3. Door frame; 4. Adjustment assembly; 5. Arc rod; 6. Torsion spring; 7. Reinforcing bar; 11. Fixing frame; 12. Base plate; 13. Clamping plate; 14. First threaded rod; 15. Guide rod; 21. Lifting frame; 22. Second threaded rod; 23. Guide tube; 24. Threaded tube; 25. Adjusting head; 26. Connecting ring; 27. Guide frame; 28. Limiting block; 41. Connecting frame; 42. Third threaded rod; 43. Lifting rod; 44. Guide hole; 51. Fixing block; 52. Inclined surface. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Reference Figures 1 to 8 This embodiment discloses a rapid welding and positioning fixture for the steel reinforcement frame inside a civil defense door leaf, including a clamping assembly 1 and a lifting assembly 2. The clamping assembly 1 includes a fixing frame 11, a base plate 12 fixedly installed at the bottom of the fixing frame 11, and at least two sets of clamping plates 13 slidably installed on the fixing frame 11. A first threaded rod 14 is threadedly connected to the clamping plate 13 and rotatably connected to the fixing frame 11. Two sets of guide rods 15 are fixedly installed on the fixing frame 11. The base plate 12 is inserted into the bottom of the door leaf frame 3, and the first threaded rod 14 is rotated to make the clamping plate 13 and the base plate 12 cooperate to clamp the door leaf frame 3, thereby fixing the clamping assembly 1 onto the door leaf frame 3. It should be noted that the bottom of the door leaf frame 3 is raised by pads or placed on a suitable platform to make the door leaf frame 3 have a certain distance from the ground, ensuring that the base plate 12 can be smoothly placed into the bottom of the door leaf frame 3.

[0037] Reference Figures 2 to 4The lifting assembly 2 includes a lifting frame 21, which is slidably connected to a guide rod 15 on a fixed frame 11. A second threaded rod 22 is threadedly connected to the lifting frame 21 and rotatably connected to the fixed frame 11. Several guide tubes 23 are fixedly installed on the lifting frame 21, and the guide tubes 23 are evenly spaced. A threaded tube 24 is installed at the bottom of each guide tube 23, and the threaded tube 24 is coaxial with the guide tube 23. An adjusting head 25 is threadedly connected to the threaded tube 24, and a connecting ring 26 is rotatably installed on the adjusting head 25. A guide frame 27 is fixedly installed at the bottom of the connecting ring 26, and two limit blocks 28 are fixedly installed on the guide frame 27. Rotating the second threaded rod 22 causes the lifting frame 21 to drive multiple sets of guide tubes 23, threaded tubes 24, adjusting heads 25, connecting rings 26, guide frames 27, and limit blocks 28 to move synchronously, improving adjustment efficiency.

[0038] Reference Figure 2 , Figures 5 to 8 The positioning fixture also includes an adjustment component 4, which includes a connecting frame 41. A third threaded rod 42 is threadedly connected to the connecting frame 41. The third threaded rod 42 is rotatably connected to the lifting frame 21. Several lifting rods 43 are fixedly installed on the connecting frame 41. The several lifting rods 43 are coaxial with the guide tube 23 and correspond one-to-one. The lifting rods 43 are slidably connected to the guide tube 23 and pass through the guide tube 23 and the threaded tube 24. A guide hole 44 is opened on the lifting rod 43. The guide frame 27 slides in the guide hole 44. Two limit blocks 28 are distributed on both sides of the guide hole 44.

[0039] Two sets of arc-shaped rods 5 are rotatably installed at the bottom of the lifting rod 43. Fixing blocks 51 are fixedly installed on both sides of the arc-shaped rods 5. The fixing blocks 51 on the same side of the two arc-shaped rods 5 form a limiting groove. A torsion spring 6 is provided at the connecting shaft of the arc-shaped rods 5 to drive the free ends of the two arc-shaped rods 5 to fit together and form a support hole. An inclined surface 52 is provided on the inner side of the arc-shaped rods 5.

[0040] When the reinforcing bar 7 is welded to the bottom of the inner groove of the door frame 3, the reinforcing bar 7 is inserted into the support hole formed by the two arc-shaped rods 5. By controlling the limit block 28 to be inserted into the limit groove formed by the fixing block 51, the arc-shaped rods 5 are prevented from rotating and opening, ensuring the stability of the limit on the reinforcing bar 7. By controlling the arc-shaped rods 5 to descend, the bottom of the lifting rod 43 presses the reinforcing bar 7 against the bottom of the inner groove of the door frame 3, and the longitudinal and transverse reinforcing bars 7 are in staggered contact. At this time, the limit on the reinforcing bar 7 is as follows: Figure 7 In the middle position. When the reinforcing bar 7 is welded to the top of the inner groove of the door frame 3, the limiting block 28 is also controlled to be inserted between the two fixing blocks 51 for limiting. Then, the arc rod 5 and the limiting block 28 are controlled to rise synchronously. The two arc rods 5 hold the reinforcing bar 7 at the top of the inner groove of the door frame 3. At this time, the limiting position of the reinforcing bar 7 is as follows. Figure 8 As shown. Therefore, this welding positioning fixture can position the double-layer steel bars 7 in the inner groove of the door frame 3 separately, significantly reducing the difficulty of positioning and welding the steel bars 7.

[0041] When in use, the bottom of the air-raid shelter door frame 3 is raised so that a gap greater than the thickness of the base plate 12 is formed between the bottom surface of the air-raid shelter door frame 3 and the working surface, providing reserved installation space for the base plate 12 of the clamping assembly 1.

[0042] Four sets of clamping components 1 are installed around the perimeter of the door frame 3. The base plate 12 of the clamping component 1 is horizontally inserted into the receiving gap on the bottom surface of the air-raid shelter door frame 3, so that the inner side wall of the fixing frame 11 is in contact with the outer side wall of the air-raid shelter door frame 3. The first threaded rod 14 is rotated to drive the clamping plate 13 to move along the fixing frame 11 towards the air-raid shelter door frame 3 until the clamping plate 13 and the base plate 12 cooperate to clamp the edge of the air-raid shelter door frame 3. The second threaded rod 22 is rotated to drive the lifting frame 21 to move vertically along the guide rod 15 and adjust it to the initial working position that matches the height of the air-raid shelter door frame 3. The four sides of the door frame 3 are arranged in sequence to complete the rigid fixation of the tooling.

[0043] Manually pry open the two sets of arc rods 5 to overcome the preload of the torsion spring 6, and insert the ends of the longitudinal steel bars 7 to be welded into the two sets of arc rods 5 at the corresponding positions of the four sets of tooling. Release the arc rods 5 so that they are reset under the action of the torsion spring 6. The free ends of the two arc rods 5 abut against each other to form a support hole to support the steel bars 7. Rotate the adjusting head 25 to drive the connecting ring 26 and the guide frame 27 to descend, so that the limiting block 28 is inserted into the limiting groove formed by the two fixed blocks 51. The arc rods 5 cannot be rotated and opened due to the limiting action of the limiting block 28.

[0044] After several parallel reinforcing bars 7 have been placed, the second threaded rod 22 is slightly rotated to drive the lifting frame 21 to move, thereby causing the lifting assembly 2, adjusting assembly 4, and arc rod 5 to descend synchronously until the reinforcing bars 7 abut against the bottom of the inner groove of the door frame 3. At the same time, the bottom of the lifting rod 43 abuts against the reinforcing bars 7 to keep the reinforcing bars 7 stable. Similarly, the transverse reinforcing bars 7 are laid in the same way, and by rotating the corresponding second threaded rod 22, the transverse reinforcing bars 7 are controlled to overlap with the longitudinal reinforcing bars 7 to complete the laying of the reinforcing bars 7 in the same layer. The connection points between the reinforcing bars 7 and between the reinforcing bars 7 and the door frame 3 are welded by a robot or manually to complete the laying of the bottom frame.

[0045] After the bottom layer of reinforcing bars 7 is welded, first rotate the second threaded rod 22 to raise the lifting assembly 2 and the adjusting assembly 4. After the lifting rod 43 rises, its bottom separates from the reinforcing bar 7, while the reinforcing bar 7 remains between the two arc-shaped rods 5. Then rotate the third threaded rod 42 to lower the connecting frame 41, which in turn lowers the lifting rod 43, the arc-shaped rods 5, and the fixing block 51. The limiting block 28 and the fixing block 51 separate, releasing the circumferential lock of the arc-shaped rod 5. Rotate the second threaded rod 22 again to adjust the lifting frame 21 upwards to the upper layer of reinforcing bar 7 loading position. The arc-shaped rods 5 and... As it rises, the reinforcing bar 7 contacts the inclined plane 52 and forces the arc-shaped rod 5 to rotate and open, thereby achieving rapid separation of the arc-shaped rod 5 and the reinforcing bar 7. After the arc-shaped rod 5 and the reinforcing bar 7 separate, the third threaded rod 42 is rotated to make the limiting block 28 re-insert between the two fixing blocks 51 to limit the movement, and the limiting block 28 is reset. According to the feeding method of the lower layer reinforcing bar 7, all the upper layer transverse reinforcing bars 7 are pre-arranged in the corresponding positions of the arc-shaped rod 5 support holes. The adjusting head 25 is rotated again to make the limiting block 28 insert into the limiting groove to lock the arc-shaped rod 5.

[0046] The difference between laying the upper layer of reinforcing bars 7 and laying the lower layer of reinforcing bars 7 is that the second threaded rod 22 rotates to control the longitudinal reinforcing bars 7 to move upward and abut against the top of the inner groove of the door frame 3. The free end of the locked and closed arc rod 5 limits the bottom of the longitudinal reinforcing bars 7, while the transverse reinforcing bars 7 are located at the bottom of the longitudinal reinforcing bars 7. Therefore, the transverse reinforcing bars 7 are laid first, and then the longitudinal reinforcing bars 7 are laid and fixed. The transverse reinforcing bars 7 are moved upward so that they abut against the bottom of the longitudinal reinforcing bars 7, and the connection points are welded to complete the welding and fixing of the double-layer frame.

[0047] It should be noted that the two layers of reinforcing bars 7 can be fixed together by welded connecting bars, thereby ensuring that the two layers of reinforcing bars 7 form a whole and improving the stability of the skeleton.

[0048] After all the steel bars 7 are welded, rotate the first threaded rod 14 in the opposite direction to release the clamping effect of the clamping plate 13 on the air-raid shelter door frame 3, and pull the bottom plate 12 out of the receiving gap at the bottom of the air-raid shelter door frame 3. The tooling can then be disassembled and transferred to the next air-raid shelter door frame 3 for reuse.

[0049] The clamping assembly 1 of the welding positioning fixture provides an installation reference for the entire fixture. By rotating the first threaded rod 14, the clamping plate 13 is driven to make linear feed movements along the fixed frame 11, forming a bidirectional clamping force with the bottom plate 12 fixed at the bottom, realizing a detachable rigid connection between the fixture and the air defense door frame 3. There is no need to pre-drill holes or pre-weld the air defense door frame 3, making disassembly and assembly convenient.

[0050] The lifting assembly 2 uses two sets of guide rods 15 fixed on the fixed frame 11 as vertical motion constraints. By rotating the second threaded rod 22, it drives the lifting frame 21 to make linear displacement in the vertical direction, which drives the guide tube 23, the adjustment assembly 4, the arc-shaped positioning mechanism and other positioning execution units to lift synchronously, adapting to the processing needs of civil defense door panels of different thicknesses.

[0051] The threaded tube 24, which is coaxially connected to the bottom of the guide tube 23, is threadedly engaged with the adjusting head 25. By rotating the adjusting head 25, the connecting ring 26, the guide frame 27, and the limiting block 28 can be driven to make fine adjustments in the vertical direction, pre-matching the spacing of the steel bars 7 with different design requirements, ensuring the consistency of the spacing of the steel bars 7 processed in the same batch, and eliminating the error of manual measurement of each bar.

[0052] Under the preload of the torsion spring 6, the two sets of arc-shaped rods 5 are normally closed, forming a support hole for the steel bar 7 to be welded; when the two sets of limiting blocks 28 at the end of the guide frame 27 are embedded in the limiting groove formed by the fixing block 51 at the end of the arc-shaped rod 5, the rotational freedom of the arc-shaped rod 5 is completely restricted, achieving circumferential locking:

[0053] When positioning the lower layer of reinforcing bars 7, the adjusting component 4 drives the arc rod 5 to move downward, and presses the reinforcing bars 7 to be welded against the bottom surface of the inner groove of the air-raid shelter door frame 3 through the bottom end of the lifting rod 43. The arc rod 5 in the locked state prevents the reinforcing bars 7 to be welded from shifting.

[0054] When positioning the upper layer of reinforcing bars 7, the adjusting component 4 drives the arc-shaped rod 5 upward. The closed arc-shaped rod 5 presses the reinforcing bar 7 to be welded against the top surface of the inner groove of the air-raid shelter door frame 3. The locked arc-shaped rod 5 ensures the positional accuracy of the reinforcing bar 7 to be welded.

[0055] 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 rapid welding and positioning fixture for the steel reinforcement frame inside a civil defense door, characterized in that: Includes several clamping components (1) clamped around the door frame (3); Several lifting components (2) include a lifting frame (21) slidably mounted on a clamping component (1), a second threaded rod (22) screwed onto the lifting frame (21), the second threaded rod (22) being rotatably connected to the clamping component (1), several guide tubes (23) being installed on the lifting frame (21), threaded tubes (24) being installed on the guide tubes (23), an adjusting head (25) being screwed onto the threaded tubes (24), and a limit mechanism being rotatably mounted on the adjusting head (25); Several adjustment components (4) include several lifting rods (43) that are slidably connected to the guide tube (23). Two sets of arc rods (5) are rotatably mounted on the lifting rods (43), and fixed blocks (51) are installed on both sides of the arc rods (5). The reinforcing bar (7) is inserted between the two sets of arc rods (5). The adjusting head (25) is rotated to drive the limiting mechanism to be inserted between the two fixed blocks (51), so that the free ends of the two sets of arc rods (5) are locked. The lifting assembly (2) drives the arc rods (5) to rise and fall, so that the reinforcing bar (7) is fixed in the inner groove of the door frame (3).

2. The rapid welding and positioning fixture for the inner steel reinforcement frame of a civil defense door leaf according to claim 1, characterized in that: The adjustment assembly (4) also includes a connecting frame (41), on which a third threaded rod (42) is screwed. The third threaded rod (42) is rotatably connected to the lifting frame (21). The lifting rod (43) is installed on the connecting frame (41), and the limiting mechanism is slidably connected to the lifting rod (43).

3. The rapid welding and positioning fixture for the steel reinforcement frame inside a civil defense door leaf according to claim 1, characterized in that: Several guide tubes (23) are distributed at equal intervals, and the threaded tube (24) is coaxial with the guide tube (23).

4. The rapid welding and positioning fixture for the inner steel reinforcement frame of a civil defense door leaf according to claim 1, characterized in that: Several lifting rods (43) are coaxial with the guide tube (23) and are in corresponding positions. The lifting rods (43) are slidably connected to the guide tube (23) and the lifting rods (43) pass through the guide tube (23) and the threaded tube (24).

5. A rapid welding and positioning fixture for the inner steel reinforcement frame of a civil defense door leaf according to claim 1, characterized in that: A torsion spring (6) is provided at the connecting shaft of the arc-shaped rod (5).

6. The rapid welding and positioning fixture for the inner steel reinforcement frame of a civil defense door leaf according to claim 1, characterized in that: The inner side of the arc-shaped rod (5) is provided with a slope (52).

7. A rapid welding and positioning fixture for the inner steel reinforcement frame of a civil defense door leaf according to any one of claims 1-6, characterized in that: The limiting mechanism includes a connecting ring (26) rotatably mounted on an adjusting head (25), a guide frame (27) mounted on the connecting ring (26), and a limiting block (28) mounted on the guide frame (27).

8. A rapid welding and positioning fixture for the inner steel reinforcement frame of a civil defense door leaf according to any one of claims 1-6, characterized in that: The clamping assembly (1) includes a fixed frame (11), a base plate (12) is mounted on the fixed frame (11), and several clamping plates (13) are slidably mounted on the fixed frame (11). A first threaded rod (14) is screwed onto the clamping plate (13), and the first threaded rod (14) is rotatably connected to the fixed frame (11).

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