Welding positioning tool for steel structure protective air-tight door

Abstract

The invention relates to the technical field of welding positioning tools, and discloses a steel structure protective air-tight door welding positioning tool which comprises four cylinder bodies fixedly installed on a supporting platform, the cylinder bodies are filled with damping oil, pistons are movably arranged in the cylinder bodies in a sleeved mode, one sides of the pistons are fixedly connected with first pipe bodies, and the other sides of the first pipe bodies are fixedly connected with second pipe bodies. A positioning friction plate is arranged at one end of the first pipe body, a throttling hole communicated with a cavity on the other side of the piston is formed in the first pipe body, and a positioning spring is arranged between the side, away from the positioning device, of the piston and one L-shaped supporting plate. Through a positioning tool structure composed of a cylinder body, a piston and a positioning device, thrust formed by thermal expansion of a welding seam can push a positioning friction plate and a piston compression spring in the welding process, and the situation that due to the fact that instantaneous stress generated by thermal expansion cannot be released, the welding seam is prone to cracking or delayed cracking occurs after use for a period of time is avoided; and therefore, the welding safety of the steel structure protective air-tight door is guaranteed.

Description

Technical Field

[0001] This application relates to the field of welding positioning fixture technology, and in particular to a welding positioning fixture for a steel structure protective airtight door. Background Technology

[0002] Steel structure protective airtight doors are door panels and frames made primarily of high-quality steel (such as profiles and steel plates). Through a special sealing structure, the door possesses the strength to withstand the overpressure of a predetermined explosive shock wave, as well as the sealing function to prevent external toxic and harmful gases, biological agents, or radioactive dust from seeping in through the door gaps. In the production process of steel structure protective airtight doors, welding quality is the core factor affecting the structural strength and sealing performance of these doors, and specialized welding positioning fixtures are important tools to ensure welding accuracy and consistency and improve production efficiency.

[0003] Due to the large heat capacity and long cooling process during the welding of thick workpieces such as steel structure protective airtight doors, thermal expansion occurs during welding. Existing conventional fixed positioning fixtures, after positioning the steel structure protective airtight door, cannot release the instantaneous stress generated by thermal expansion during welding. This stress accumulates inside the steel structure protective airtight door, easily leading to weld cracking or delayed cracking after a period of use. Furthermore, if existing positioning fixtures use springs for conventional buffering to offset thermal expansion, the restoring force of the springs after further compression due to thermal expansion during the cooling stage from semi-solid to fully solid state can directly impact the semi-solid weld, easily causing weld deformation and affecting welding quality. Summary of the Invention

[0004] This application proposes a welding positioning fixture for steel structure protective airtight doors, which has the advantage of improving welding quality when welding and positioning steel structure protective airtight doors, thereby solving the problem that existing conventional positioning fixtures are prone to causing poor weld quality during use.

[0005] To achieve the above objectives, this application adopts the following technical solution: a welding positioning fixture for a steel structure protective airtight door, comprising four cylinders fixedly installed on a support platform. The cylinders are filled with damping oil, and pistons are movably fitted inside the cylinders. A positioning device is fixedly connected to one side of the piston. The positioning device includes a first tube, and a positioning friction plate is provided at one end of the first tube extending outside the cylinder. The positioning friction plates of the four positioning devices respectively abut against the four corners of the door to be welded to position the door. A throttling orifice is opened on the first tube to connect to the other side chamber of the piston. A positioning spring is provided between the side of the piston away from the positioning device and one of the L-shaped support plates.

[0006] During use, the positioning friction plate is positioned by the elastic force of the positioning spring. During welding, the thrust generated by the thermal expansion of the weld will push the positioning friction plate and piston to compress the spring. During the cooling stage after welding, the damping oil flows through the throttling orifice and the throttling effect causes the piston to slowly return to its original position, so that the elastic force of the positioning spring does not interfere with the cooling of the weld.

[0007] Furthermore, the support platform has several threaded grooves for fixing the positioning base plate, and four rotating support devices are fixedly installed on the top of the support platform. Each rotating support device includes a positioning base plate fixed to the threaded groove of the support platform by bolts. A rotating column is rotatably sleeved at the center of the top of the positioning base plate. A passive rotating plate is fixedly connected to the top of the rotating column. L-shaped support plates are fixedly installed on both sides of the top of the passive rotating plate. The cylinder is fixedly set between two L-shaped support plates. Through the threaded grooves on the support platform for fixing the positioning base plate, the cylinder can rotate relative to the positioning base plate to adjust the position of the four cylinders according to the size of the steel structure airtight door, ensuring that the four cylinders can be positioned at the four corners of the steel structure airtight door.

[0008] Furthermore, an inverted T-shaped limiting component is movably fitted onto the passive rotating plate, and the bottom of the inverted T-shaped limiting component is movably connected to the top of the positioning base plate. A nut is threaded onto the top of the inverted T-shaped limiting component. By tightening the nut, the bottom of the inverted T-shaped limiting component is tightly fitted to the top of the positioning base plate, thereby fixing the rotatable passive rotating plate.

[0009] Furthermore, the end of the first tube away from the piston extends outward from the outer side of the L-shaped support plate and is fixedly connected to a linkage rod. One end of the linkage rod is fixedly connected to a linkage plate, and the linkage plate is fixedly connected to the positioning friction plate.

[0010] Furthermore, the positioning friction plate has a groove on the side away from the linkage plate, and the planes on both sides of the inner wall of the groove are perpendicular, so that the groove on one side of the positioning friction plate can be locked at the four corners of the steel structure airtight door. Therefore, when welding the steel structure airtight door, it is not necessary to set multiple positioning fixtures on each side of the steel structure airtight door, which can reduce the number of positioning fixtures, facilitate use, and improve the positioning efficiency of the steel structure airtight door before welding.

[0011] Furthermore, a plunger is movably fitted inside one end of the first tube, and the outer side of the plunger is sealed to the inner side of the first tube. One end of the plunger has a slot communicating with a throttling orifice. By moving the plunger, the number of throttling orifices communicating with the slot can be controlled. This allows for control of the amount of damping oil flowing through the throttling orifices, based on the different cooling times after welding caused by the different door size and materials. This, in turn, controls the piston's reset movement speed, ensuring the positioning function of the positioning friction plate during welding cooling, while minimizing the impact of the spring force of the positioning spring on the weld solidification.

[0012] Furthermore, a throttling adjustment device is fixedly installed on the side of the piston away from the positioning device. The throttling adjustment device includes a first tube body fixedly connected to the other side of the piston, and the inner cavity of the first tube body is connected to the inner cavity of the first tube body. A circumferential array of guide holes is opened at the end of the first tube body near the piston, and the diameter of the guide holes is larger than the diameter of the throttling holes. A sliding plug is movably fitted inside the first tube body. A linkage shaft is fixedly fitted in the middle of the sliding plug, and a sealing ring is provided at the connection between the linkage shaft and the sliding plug for sealing. The outer side of the sliding plug is sealed and fitted to the inner side of the first tube body. One end of the linkage shaft is fixedly connected to one end of the plunger. A movable adjustment device is rotatably connected to the side of the sliding plug away from the guide holes. The throttling adjustment device and the positioning device are moved by moving the movable adjustment device to control the number of throttling holes connected to the slot.

[0013] Furthermore, the movable adjustment device includes an annular rotating plate and a limiting plate movably mounted on the other end of the linkage shaft. The annular rotating plate is located between the limiting plate and the sliding plug. Two symmetrically arranged transmission shafts are fixedly connected to the outer edge of the limiting plate away from the sliding plug. A rotating sleeve is fixedly connected to the end of the two transmission shafts away from the annular rotating plate. A threaded rod is fixedly connected to the side of the rotating sleeve away from the annular rotating plate. One end of the threaded rod extends out of the outside of the first tube and is fixedly connected to an adjusting wheel. A threaded sleeve is fixedly installed at the end of the first tube away from the piston. The threaded rod and the threaded sleeve are threadedly connected. A movable seal is formed inside the first tube by the sliding plug to prevent the damping oil in the cylinder from leaking. At the same time, by rotating the adjusting wheel, the threaded rod is driven to rotate, so that the threaded rod can drive the rotating sleeve, transmission shaft, limiting plate, annular rotating plate, sliding plug, linkage shaft, and plunger to move horizontally, thereby controlling the number of throttling holes connected to the slot.

[0014] The beneficial effects of this invention are as follows: 1. This application provides a welding positioning fixture for steel structure protective airtight doors. The positioning fixture structure consists of a cylinder, a piston, and a positioning device. The positioning friction plate is positioned by the elastic force of the positioning spring. During welding, the thrust generated by the thermal expansion of the weld will push the positioning friction plate and the piston to compress the spring. Compared with existing positioning fixtures, this avoids the problem that the instantaneous stress generated by thermal expansion during welding of the steel structure protective airtight door cannot be released due to the fixed setting of the positioning fixture. This stress accumulates inside the steel structure protective airtight door and is prone to weld cracking or delayed cracking after a period of use. This ensures the welding safety of the steel structure protective airtight door.

[0015] 2. The welding positioning fixture for a steel structure protective airtight door provided in this application utilizes the throttling and damping effect of the damping oil flowing through the throttling orifice during the cooling stage after welding. This allows the piston to slowly return to its original position, ensuring that the elastic force of the positioning spring does not interfere with the cooling of the weld. Compared to conventional structures that use springs or other elastic components to buffer and compensate for welding thermal expansion, this avoids the problem that the restoring force of the spring after further compression would directly impact the semi-solid weld during the weld cooling stage, which could easily lead to weld deformation. This further improves the welding quality of the steel structure protective airtight door.

[0016] 3. The steel structure protective airtight door welding positioning fixture provided in this application uses four cylinders and positioning devices. The positioning friction plates in the four positioning devices abut against the four corners of the door to be welded to position the door. This eliminates the need to set multiple positioning fixtures on each side of the steel structure airtight door, reduces the number of positioning fixtures, facilitates use, and improves the positioning efficiency of the steel structure airtight door before welding. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 A schematic diagram of one of the positioning tooling structures; Figure 3 for Figure 2 The front view; Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of the middle cylinder block; Figure 5 for Figure 4 A schematic diagram of the positioning device structure in the diagram; Figure 6 for Figure 4 A schematic diagram of the throttling regulating device in the middle; Figure 7 for Figure 4 A schematic diagram of the unidirectional flow control component structure.

[0018] In the diagram: 1. Support platform; 2. Rotating support device; 201. Positioning base plate; 202. Rotating column; 203. Passive rotating plate; 204. Inverted T-shaped limiting component; 3. L-shaped support plate; 4. Cylinder body; 5. Piston; 501. Through hole; 6. Positioning device; 601. First tube body; 6011. Throttling orifice; 602. Linkage rod; 603. Linkage plate; 604. Positioning friction plate; 605. Plunger; 6051. Groove; 7. Throttling adjustment device; 701 7011. First tube body; 702. Guide hole; 703. Sliding plug; 704. Linkage shaft; 8. Moving adjustment device; 805. Annular rotating plate; 806. Limiting plate; 807. Drive shaft; 808. Rotating sleeve; 809. Threaded rod; 8000. Adjusting wheel; 9. Threaded sleeve; 100. One-way flow control assembly; 101. Connecting shaft; 102. First ring plate; 103. Sealing ring; 104. Second ring plate; 105. Sealing spring; 11. Positioning spring. Detailed Implementation

[0019] 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.

[0020] like Figures 1-3 A positioning fixture for welding steel structure airtight doors includes a support platform 1. Four rotating support devices 2 are fixedly installed on the top of the support platform 1. Each rotating support device 2 includes a positioning base plate 201 fixedly installed on the support platform 1 and bolted to the top of the support platform 1. The support platform 1 has several threaded grooves for fixing the positioning base plate 201, so as to adjust the position of each rotating support device 2 according to the size of the steel structure airtight door. A rotating column 202 is rotatably sleeved at the middle of the top of the positioning base plate 201. A passive rotating plate 203 is fixedly connected to the top of the rotating column 202. An inverted T-shaped limiting member 204 is movably sleeved on the passive rotating plate 203, and the bottom of the inverted T-shaped limiting member 204 is movably connected to the top of the positioning base plate 201. A nut is threadedly sleeved on the top of the inverted T-shaped limiting member 204. By tightening the nut, the bottom of the inverted T-shaped limiting member 204 is tightly attached to the top of the positioning base plate 201, thereby fixing the rotatable passive rotating plate 203.

[0021] like Figures 2-4The passive rotating plate 203 has L-shaped support plates 3 fixedly installed on both sides of its top. A cylinder 4 is fixedly installed between the two L-shaped support plates 3. The inner cavity of the cylinder 4 is filled with damping oil. A piston 5 is movably fitted in the middle of the inner cavity of the cylinder 4. A positioning device 6 and a throttling adjustment device 7 are fixedly connected to both sides of the piston 5.

[0022] like Figures 4-5 The positioning device 6 includes a first tube 601 fixedly connected to one side of the piston 5. The end of the first tube 601 away from the piston 5 extends outward from the outer side of the L-shaped support plate 3 and is fixedly connected to a linkage rod 602. One end of the linkage rod 602 is fixedly connected to a linkage plate 603. A positioning friction plate 604 is fixedly installed on one side of the linkage plate 603, and a groove is formed on the side of the positioning friction plate 604 away from the linkage plate 603. The planes containing the inner walls of the two sides of the groove are perpendicular, allowing the groove on one side of the positioning friction plate 604 to... Figure 1 As shown, the fixtures are positioned at the four corners of the steel structure airtight door, thus eliminating the need to install multiple positioning fixtures on each side of the steel structure airtight door during welding. This reduces the number of positioning fixtures, simplifies the use, and improves the positioning efficiency of the steel structure airtight door before welding.

[0023] The top of the first tube 601 away from the linkage rod 602 has several equidistantly arranged throttling holes 6011. A plunger 605 is movably fitted inside the first tube 601 away from the linkage rod 602, and the outer side of the plunger 605 is sealed to the inner side of the first tube 601. One end of the plunger 605 has a slot 6051 that communicates with the throttling holes 6011. By moving the plunger 605, the number of throttling holes 6011 communicating with the slot 6051 can be controlled.

[0024] like Figures 4-6 The throttling regulating device 7 includes a first tube 701 fixedly connected to the other side of the piston 5, and the inner cavity of the first tube 701 is connected to the inner cavity of the first tube 601. The first tube 701 has a circumferential array of guide holes 7011 at one end near the piston 5, and the diameter of the guide holes 7011 is larger than the diameter of the throttling holes 6011. A sliding plug 702 is movably fitted inside the first tube 701. A linkage shaft 703 is fixedly fitted in the middle of the sliding plug 702, and a sealing ring is provided at the connection between the linkage shaft 703 and the sliding plug 702 for sealing. The outer side of the sliding plug 702 is sealed and fitted to the inner side of the first tube 701. One end of the linkage shaft 703 is fixedly connected to one end of the plunger 605. A movable regulating device 8 is rotatably connected to the side of the sliding plug 702 away from the guide holes 7011. By moving the movable regulating device 8, the throttling regulating device 7 and the positioning device 6 are moved so as to control the number of throttling holes 6011 connected to the slot 6051.

[0025] like Figures 4-7The movable adjustment device 8 includes an annular rotating plate 801 and a limiting plate 802 movably mounted on the other end of the linkage shaft 703. The annular rotating plate 801 is located between the limiting plate 802 and the slide plug 702. Two symmetrically arranged transmission shafts 803 are fixedly connected to the outer edge of the limiting plate 802 away from the slide plug 702. A rotating sleeve 804 is fixedly connected to the end of the two transmission shafts 803 away from the annular rotating plate 801. A threaded rod 805 is fixedly connected to the side of the rotating sleeve 804 away from the annular rotating plate 801. One end of the threaded rod 805 extends out of the outside of the first tube body 701 and is fixedly connected to an adjusting wheel. 806, a threaded sleeve 9 is fixedly installed at the end of the first tube body 701 away from the piston 5. The threaded rod 805 is threadedly connected to the threaded sleeve 9. A movable seal is formed inside the first tube body 701 through the sliding plug 702 to prevent the damping oil in the cylinder 4 from leaking. At the same time, by rotating the adjusting wheel 806, the threaded rod 805 is driven to rotate, so that the threaded rod 805 can drive the rotating sleeve 804, the transmission shaft 803, the limiting plate 802, the annular rotating plate 801, the sliding plug 702, the linkage shaft 703, and the plunger 605 to move horizontally, thereby controlling the number of throttling holes 6011 connected to the slot 6051.

[0026] like Figures 4-7 The piston 5 has a through hole 501. A threaded sleeve 9 is provided on the side of the piston 5 near the throttling adjustment device 7 to block the through hole 501. The threaded sleeve 9 includes two connecting shafts 101 that are movably sleeved with the piston 5. A first ring plate 102 is fixedly sleeved on one end of the connecting shaft 101. A sealing ring 103 for blocking the through hole 501 is fixedly installed on the first ring plate 102. A second ring plate 104 is fixedly connected to the other end of the sealing ring 103. A sealing spring 105 is provided between the second ring plate 104 and the piston 5 and is movably sleeved on the outside of the connecting shaft 101. The elastic force of the sealing spring 105 causes the sealing ring 103 to fit against one side of the piston 5 and block the through hole 501. A positioning spring 11 is provided between the piston 5 and one of the L-shaped support plates 3 and is movably sleeved on the outside of the first tube body 701.

[0027] During the welding of the steel structure protective airtight door, the weld area expands due to heat, thereby generating a thrust on the positioning friction plate 604 used for positioning. This pushes the positioning friction plate 604, linkage plate 603, linkage rod 602, first tube 601, and piston 5 together relative to the cylinder 4. Figure 4As shown, moving to the right, the damping oil in the right chamber of piston 5 inside cylinder 4 pushes the sealing ring 103 to open the through hole 501, allowing the damping oil in the right chamber of piston 5 inside cylinder 4 to flow to the left chamber of piston 5 through the through hole 501. This utilizes the elastic force of the positioning spring 11 to buffer the thermal expansion during welding of the steel structure protective airtight door, preventing the instantaneous stress generated by thermal expansion during welding from being unable to be released due to the fixed setting of the positioning fixture. This stress accumulates inside the steel structure protective airtight door, easily leading to weld cracking or delayed cracking after a period of use, thus ensuring the safety of the steel structure protective airtight door. Furthermore, during the weld cooling stage after welding, the positioning friction plate 604 loses its thrust, and the elastic force of the positioning spring 11 pushes piston 5, first tube 601, linkage rod 602, linkage plate 603, and positioning friction plate 604 towards one side of the steel structure protective airtight door, i.e. Figure 4 As shown, the piston 5 moves to the left relative to the cylinder 4. The elastic force of the sealing spring 105 causes the sealing ring 103 to adhere to the side of the piston 5, blocking the through hole 501. The damping oil in the left chamber of the piston 5 in the cylinder 4 can only flow to the right chamber of the cylinder 4 through the throttling hole 6011, the slot 6051, and the guide hole 7011. By utilizing the throttling effect of the damping oil flowing through the throttling hole 6011, the piston 5, the first tube 601, the linkage rod 602, the linkage plate 603, and the positioning friction plate 604 move slowly as a whole. This is to avoid the problem that the restoring force of the positioning spring 11 will directly impact the semi-solid weld during the weld cooling stage, which could easily lead to weld deformation and affect the welding quality.

[0028] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A welding positioning fixture for a steel structure protective airtight door, characterized in that, The device includes four cylinders fixedly mounted on a support platform. The cylinders are filled with damping oil and have pistons movably mounted inside. A positioning device is fixedly connected to one side of each piston. The positioning device includes a first tube with a positioning friction plate at one end extending outside the cylinder. The positioning friction plates of the four positioning devices abut against the four corners of the door to be welded, positioning the door. A throttling orifice is provided on the first tube, connecting to the other side chamber of the piston. A positioning spring is provided between the side of the piston away from the positioning device and one of the L-shaped support plates. During use, the positioning friction plate is positioned by the elastic force of the positioning spring. During welding, the thrust generated by the thermal expansion of the weld will push the positioning friction plate and piston to compress the spring. During the cooling stage after welding, the damping oil flows through the throttling orifice and the throttling effect causes the piston to slowly return to its original position, so that the elastic force of the positioning spring does not interfere with the cooling of the weld.

2. The welding positioning fixture for steel structure protective airtight doors according to claim 1, characterized in that, The support platform has several threaded grooves for fixing the positioning base plate, and four rotating support devices are fixedly installed on the top of the support platform. Each rotating support device includes a positioning base plate that is fixed to the threaded groove of the support platform by bolts. A rotating column is rotatably sleeved at the middle of the top of the positioning base plate. A passive rotating plate is fixedly connected to the top of the rotating column. L-shaped support plates are fixedly installed on both sides of the top of the passive rotating plate. The cylinder is fixedly set between two L-shaped support plates.

3. The welding positioning fixture for steel structure protective airtight doors according to claim 2, characterized in that, The passive rotating plate is movably fitted with an inverted T-shaped limiting component, and the bottom of the inverted T-shaped limiting component is movably connected to the top of the positioning base plate. A nut is threaded onto the top of the inverted T-shaped limiting component.

4. The welding positioning fixture for steel structure protective airtight doors according to claim 1, characterized in that, The first tube extends from the end away from the piston to the outer side of the L-shaped support plate and is fixedly connected to a linkage rod. One end of the linkage rod is fixedly connected to a linkage plate, and the linkage plate is fixedly connected to the positioning friction plate.

5. The welding positioning fixture for steel structure protective airtight doors according to claim 4, characterized in that, The positioning friction plate has a groove on the side away from the linkage plate, and the planes on both sides of the inner wall of the groove are perpendicular.

6. The welding positioning fixture for steel structure protective airtight doors according to claim 1, characterized in that, A plunger is movably fitted inside one end of the first tube, and the outer side of the plunger is sealed to the inner side of the first tube. One end of the plunger has a slot that communicates with the throttling orifice.

7. The welding positioning fixture for steel structure protective airtight doors according to claim 6, characterized in that, A throttling adjustment device is fixedly installed on the side of the piston away from the positioning device. The throttling adjustment device includes a first tube body fixedly connected to the other side of the piston, and the inner cavity of the first tube body is in communication with the inner cavity of the first tube body. A circumferential array of guide holes is opened at the end of the first tube body near the piston, and the diameter of the guide holes is larger than the diameter of the throttling holes. A sliding plug is movably fitted inside the first tube body. A linkage shaft is fixedly fitted in the middle of the sliding plug, and a sealing ring is provided at the connection between the linkage shaft and the sliding plug for sealing. The outer side of the sliding plug is sealed and fitted to the inner side of the first tube body. One end of the linkage shaft is fixedly connected to one end of the plunger. A movable adjustment device is rotatably connected to the side of the sliding plug away from the guide holes.

8. The welding positioning fixture for steel structure protective airtight doors according to claim 7, characterized in that, The movable adjustment device includes an annular rotating plate and a limiting plate movably mounted on the other end of the linkage shaft. The annular rotating plate is located between the limiting plate and the slide plug. Two symmetrically arranged transmission shafts are fixedly connected to the outer edge of the limiting plate away from the slide plug. Rotating sleeves are fixedly connected to the ends of the two transmission shafts away from the annular rotating plate. A threaded rod is fixedly connected to the side of the rotating sleeve away from the annular rotating plate. One end of the threaded rod extends out of the outside of the first tube and is fixedly connected to an adjusting wheel. A threaded sleeve is fixedly installed at the end of the first tube away from the piston. The threaded rod and the threaded sleeve are threadedly connected.

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