Steel bar truss floor support plate production line

Abstract

The invention relates to the field of welding production, and particularly discloses a steel bar truss floor support plate production line which comprises a conveying device used for sequentially conveying a steel bar truss and a bottom formwork to a bending device, a preheating device, a cleaning device, a welding device and a heat treatment device. The cleaning device, the preheating device, the welding device and the heat treatment device are used for sequentially cleaning, preheating, welding and slowly cooling a steel bar truss and a bottom template; the bending device is at least used for enabling the bottom template to form a plurality of upwards raised bending parts; the welding device is used for enabling the steel bar truss to abut against and be welded to the bent part. Wherein the welding device comprises one or two groups of electric resistance welding joints, a driving piece for driving the electric resistance welding joints to press a steel bar truss and a bottom template, and an adjusting piece arranged between the driving piece and the electric resistance welding joints; the adjusting piece is at least used for adjusting the pressure between the electric resistance welding connector and the steel bar truss and the pressure between the electric resistance welding connector and the bottom formwork.

Description

Technical Field

[0001] The present application relates to the field of welding production, and particularly to a steel bar truss floor slab production line. Background Art

[0002] Currently, when producing steel bar truss floor slabs, first prepare the steel bar truss, then lay a flat bottom formwork, place the prepared steel bar truss on the bottom formwork, and finally use welding equipment to weld the steel bar truss and the bottom formwork together to obtain the steel bar truss floor slab.

[0003] In the related art, Chinese Patent with the application number CN200910306133.0 proposed to weld the welding surface where the web bars of the steel bar truss exist on the plane of the bottom formwork, and use the surface contact method to increase the connection area between the steel bar truss and the bottom formwork, improving the welding quality. Regarding the above related art, the inventor believes that there are the following defects: The cost of setting the welding surface on the steel bar truss is relatively high, which requires additional welding processes or grinding processes to form, and will significantly increase the corresponding processes. If only the web bars of the steel bar truss with a special shape are used to form the welding surface, it is difficult to ensure the flatness of the welding surface, and thus it is difficult to ensure the complete contact between the welding surface and the bottom formwork. Therefore, when using the resistance welding method for welding, since the steel bar truss is difficult to completely fit with the bottom formwork, when the steel bar truss and the bottom formwork are pressed together, the pressing between the two is not tight, which will reduce the welding quality. Therefore, in the process of welding the steel bar truss and the bottom formwork to obtain the steel bar truss floor slab currently, it is difficult to balance quality and efficiency. Summary of the Invention

[0004] In order to improve the problem that it is difficult to balance quality and efficiency in the process of welding the steel bar truss and the bottom formwork to obtain the steel bar truss floor slab, the present application provides a steel bar truss floor slab production line.

[0005] The steel bar truss floor slab production line provided by the present application adopts the following technical solutions: A steel bar truss floor slab production line, comprising: a conveying device for sequentially conveying a steel bar truss and a bottom formwork to a bending device, a preheating device, a cleaning device, a welding device and a heat treatment device; the cleaning device, the preheating device, the welding device and the heat treatment device sequentially clean, preheat, weld and slowly cool the steel bar truss and the bottom formwork; the bending device is at least used to form a plurality of upwardly convex bending parts on the bottom formwork; the welding device is used to tightly weld the steel bar truss against the bending parts; wherein, the welding device includes: two groups of resistance welding heads, a driving member for driving the resistance welding heads to press against the steel bar truss and the bottom formwork, and an adjusting member arranged between the driving member and the resistance welding heads, the adjusting member is at least used to adjust the pressure between the resistance welding heads and the steel bar truss and the bottom formwork.

[0006] Optionally, each group of the resistance welding heads has a plurality of the resistance welding heads; the adjusting member includes: a plurality of telescopic bodies, a pump body member and a pressure gauge; each of the plurality of telescopic bodies has a telescopic chamber, the pump body member is used to inject and withdraw liquid from the telescopic chamber to make the telescopic body extend and contract; the pressure gauge is used to monitor the pressure in the telescopic chamber; when the two groups of resistance welding heads approach each other and press against the steel bar truss and the bottom formwork, the pump body member makes the telescopic chamber in a first pressure state; when at least half of the welding of the steel bar truss by the two groups of resistance welding heads is completed, the pump body member slowly switches the telescopic chamber from the first pressure state to the second pressure state, and then the driving member makes the two groups of resistance welding heads move away from each other.

[0007] Optionally, the adjusting member further includes: a connecting body and a connecting pipeline; the connecting body forms a connecting chamber; the connecting pipeline is used to communicate the connecting chamber with a plurality of the telescopic chambers; the adjusting member further includes: a first pressure relief member, a second pressure relief member, a first control member and a second control member; the first pressure relief member is communicated with the connecting chamber through the first control member; the second pressure relief member is communicated with the connecting chamber through the second control member; when the telescopic chamber is in the first pressure state, the first pressure relief member is communicated with the connecting chamber; when the telescopic chamber is in the second pressure state, the second pressure relief member is communicated with the connecting chamber.

[0008] Optionally, the welding device further includes a protective cover and a flexible abutting member arranged at the end of the protective cover; the protective cover has a protective chamber for accommodating part of the resistance welding heads; when the resistance welding heads press against the bottom formwork and / or the steel bar truss, the flexible abutting member presses against the bottom formwork and / or the steel bar truss to seal the protective chamber; the driving member is further used to drive the protective cover to move.

[0009] Optionally, an expandable body with a through-port is provided inside the protective cover; the through-port allows the resistance welding head to pass through; the expandable body can be switched between an expanded state and a contracted state; when the expandable body is in the expanded state, the through-port is at least narrowed to abut against the resistance welding head; when the expandable body is in the contracted state, the through-port is at least widened to be separated from the resistance welding head; the through-port is provided with a flexible scraping portion that can be completely attached to the resistance welding head.

[0010] Optionally, the expandable body has an expansion chamber, and the pump body member is further configured to inject and withdraw liquid from the expansion chamber to switch the expandable body between the expanded state and the contracted state.

[0011] Optionally, a diaphragm is provided in the expansion chamber, and the diaphragm divides the expansion chamber into an upper chamber and a lower chamber; a third pressure relief member is provided on the diaphragm, and the upper chamber and the lower chamber are communicated through the third pressure relief member; when the expandable body is in the expanded state, the part of the expandable body located in the upper chamber is separated from the resistance welding head, and the part of the expandable body located in the lower chamber abuts against the resistance welding head; the pump body member is configured to inject and withdraw liquid from the upper chamber.

[0012] Optionally, the heat treatment device includes a plurality of heating elements, and the plurality of heating elements are configured to construct a plurality of heating regions with different temperatures; the temperatures of the plurality of heating regions gradually decrease along the conveying direction of the steel bar truss and the bottom formwork; the temperatures of the plurality of heating regions are all lower than the temperature of the welding position of the steel bar truss and the bottom formwork.

[0013] Optionally, when the resistance welding head abuts against the steel bar truss and the bottom formwork, the bent portion is flattened to overlap with the bottom formwork; when the steel bar truss is welded to the bottom formwork, a molten welding point is formed between the steel bar truss and the bottom formwork; the molten welding point covers the bent portion and a part of the steel bar truss and the bottom formwork at the edge of the bent portion.

[0014] Optionally, the preheating device is configured to heat the welding position of the steel bar truss and the bottom formwork to 180 - 280 °C; when the welding device welds the steel bar truss, the temperature of the welding position of the steel bar truss and the bottom formwork is at least 600 - 800 °C; the preheating device transfers the air at the welding device to the position where the steel bar truss and the bottom formwork are preheated by the preheating device.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: 1. An upwardly convex bent portion is provided on the bottom formwork, and the welding device welds the steel bar truss to the bent portion. Therefore, when the resistance welding head presses the steel bar truss and the bottom formwork, the bent portion can be extruded and deformed, so as to avoid the situation that it is difficult to fit tightly at some positions due to uneven contact between the steel bar truss and the bottom formwork. The deformation of the bent portion can also make the contact between the steel bar truss and the bottom formwork more uniform, improving the quality of resistance welding; 2. By using the adjusting member to adjust the pressure between the resistance welding head, the steel bar truss and the bottom formwork, the pressure can be gradually reduced during the welding process to avoid the occurrence of metal splash. Description of the Drawings

[0016] Figure 1 is the overall schematic diagram according to the embodiment of the present application; Figure 2 is the structural schematic diagram of a part of the embodiment, mainly showing the structure of the welding device; Figure 3 is the structural schematic diagram of a part of the embodiment, mainly showing Figure 2 the local structure of; Figure 4 is the structural schematic diagram of a part of the embodiment, mainly showing the structure of observed from another perspective Figure 2 of; Figure 5 is the structural schematic diagram of a part of the embodiment, mainly showing Figure 3 the local structure of; Figure 6 is the structural schematic diagram of a part of the embodiment, mainly showing the structure of observed from another perspective Figure 5 of; Figure 7 is the structural schematic diagram of a part of the embodiment, mainly showing Figure 6 the local structure of; Figure 8 is the structural schematic diagram of a part of the embodiment, mainly showing Figure 7 the local structure of; Figure 9 is the structural schematic diagram of a part of the embodiment, mainly showing the structures of the first liquid injection pipe, the second liquid injection pipe, the liquid discharge pipeline and some surrounding parts; Figure 10 is the structural schematic diagram of a part of the embodiment, mainly showing the structures of the pump body member, the liquid extraction pump body and some surrounding parts; Figure 11 is the structural schematic diagram of a part of the embodiment, mainly showing a position of the cleaning device; Figure 12 is the structural schematic diagram of a part of the embodiment, mainly showing the local sectional structure of the welding device; Figure 13 is Figure 12 An enlarged view of B in Figure 14 A schematic structural diagram of a part of an embodiment, mainly showing the structure of a steel bar truss floor slab Figure 15 is Figure 14 An enlarged view of A in Figure 16 A schematic structural diagram of a part of an embodiment, mainly showing the structure of the bottom formwork

[0017] Reference numerals: 1. Conveying device; 2. Cleaning device; 3. Bending device; 31. Pressing plate; 32. Stamping rod; 33. Avoidance groove; 4. Preheating device; 5. Welding device; 51. Resistance welding head; 52. Driving member; 53. Adjusting member; 531. Telescopic body; 532. Pump body member; 533. Connecting body; 534. Connecting pipeline; 535. First pressure relief member; 536. Second pressure relief member; 537. First control member; 538. Second control member; 539. First liquid injection pipe; 54. Connecting frame; 55. Protective cover; 56. Cooling box; 57. Expanding body; 571. Expanding chamber; 572. Upper chamber; 573. Lower chamber; 574. Diaphragm; 575. Second liquid injection pipe; 576. Liquid pumping body; 577. Drainage pipeline; 6. Heat treatment device; 7. Steel bar truss; 8. Bottom formwork; 81. Bent part. Detailed implementation manners

[0018] The following will further describe the present application in detail with reference to the attached Figure 1-16 drawings.

[0019] The embodiment of the present application discloses a production line for steel bar truss floor slabs.

[0020] A production line for steel bar truss floor slabs includes: a conveying device 1, a bending device 3, a preheating device 4, a cleaning device 2, a welding device 5, and a heat treatment device 6.

[0021] The conveying device 1 is used to sequentially convey the steel bar truss 7 and the bottom formwork 8 to the bending device 3, the preheating device 4, the cleaning device 2, the welding device 5, and the heat treatment device 6. The conveying device 1 adopts a conveyor, such as a belt conveyor, a chain conveyor, or a plate chain conveyor, and preferably a plate chain conveyor. The cleaning device 2, the preheating device 4, the welding device 5, and the heat treatment device 6 sequentially preheat, clean, weld, and slowly cool the steel bar truss 7 and the bottom formwork 8. Among them, the cleaning device 2 uses a cleaning brush to clean the dust on the steel bar truss 7 and the bottom formwork 8, or the cleaning device 2 uses a combination of a cleaning brush and a vacuum cleaner, or the cleaning device 2 uses a grinding machine to grind the position where the steel bar truss 7 and the bottom formwork 8 are welded. Among them, the preheating device 4 uses an industrial hot air blower, and the industrial hot air blower blows hot air on the positions where the steel bar truss 7 and the bottom formwork 8 need to be welded to achieve preheating. In addition, since the temperature of the welded position of the steel bar truss 7 and the bottom formwork 8 will increase greatly after welding, internal stress is likely to be generated. If the internal stress is not eliminated, it is easy to cause product cracking or other quality problems. Therefore, in this application, the heat treatment device 6 is used for heat treatment to release the internal stress. In this solution, the heat treatment device 6 can also adopt an industrial hot air blower to slowly cool the welded steel bar truss 7 and the bottom formwork 8, which helps to release the internal stress at the welded position and makes the product quality better.

[0022] The bending device 3 is at least used to form a plurality of upwardly convex bending parts 81 on the bottom formwork 8. The bending device 3 can directly adopt a bending machine. However, when the bending machine bends the plate, the bending range is relatively large, which easily causes more bending under the floor slab, affecting the appearance and quality.

[0023] The bending device 3 includes a pressing plate 31 and a punching rod 32. An avoidance groove 33 is formed on the pressing plate 31, and the punching rod 32 is opposite to the avoidance groove 33. The pressing plate 31 abuts against the upper part of the bottom formwork 8, and the punching rod 32 is located below the bottom formwork 8. The bending device further includes a hydraulic cylinder, and the hydraulic cylinder drives the punching rod 32 to move upward, so that the punching rod 32 punches the bottom formwork 8 and makes a part of the bottom formwork 8 protrude upward into the avoidance groove 33, forming a small deformation, that is, forming the above-mentioned bending part 81. In this way, the bending range of the bending part 81 can be made smaller.

[0024] The welding device 5 is used to tightly weld the steel bar truss 7 against the bending part 81. Among them, the welding device 5 includes: two groups of resistance welding heads 51, a driving member 52 that drives the resistance welding heads 51 to press against the steel bar truss 7 and the bottom formwork 8, and an adjusting member 53 arranged between the driving member 52 and the resistance welding heads 51. The driving member 52 adopts a linear driving element, such as a linear motor, a lead screw nut pair, and a cylinder. The driving member 52 moves the two groups of resistance welding heads 51 closer to the bottom formwork 8 from both sides of the bottom formwork 8. One group of resistance welding heads 51 presses against the lower part of the bottom formwork 8, and the other group of resistance welding heads 51 presses against the steel bar truss 7 above the bottom formwork 8, so as to abut the steel bar truss 7 and the bottom formwork 8 together. In a specific solution, the welding device 5 further includes a connecting frame 54, and the resistance welding heads 51 are arranged on the connecting frame 54. The driving member 52 is used to drive the connecting member to move. Therefore, the driving member 52 drives the two groups of resistance welding heads 51 to move through the connecting frame 54. The adjusting member 53 is at least used to adjust the pressure between the resistance welding heads 51 and the steel bar truss 7 and the bottom formwork 8. During resistance welding, part of the steel bar truss 7 and part of the bottom formwork 8 will melt at some positions and then fuse together. However, in order to better conduct electricity to melt the steel bar truss 7 and the bottom formwork 8, it is necessary for the resistance welding heads 51 to press tightly against the steel bar truss 7 and the bottom formwork 8. Therefore, by arranging the bending part 81 on the bottom formwork 8, when the steel bar truss 7 is pressed on the bottom formwork 8, the bending part 81 will deform, so that the contact between the steel bar truss 7 and the bottom formwork 8 will be closer. Since the lengths of the steel bar truss 7 and the bottom formwork 8 are both relatively long, when the straightness tolerance is relatively large, part of the steel bar truss 7 is not straight, so there will also be part of the steel bar truss 7 that is not in close contact with the bottom formwork 8. And the resistance welding heads 51 are in surface contact with the bottom formwork 8 and the steel bar truss 7, so there will be part of the steel bar truss 7 that cannot contact the bottom formwork 8, thus affecting the efficiency of resistance welding.

[0025] Among them, the purpose of the pressure adjusting member 53 is to make the resistance welding heads 51 first press against the steel bar truss 7 and the bottom formwork 8 with a great pressure to weld the two. When the welding is halfway or more than halfway and not completed, the pressure of the resistance welding heads 51 pressing against the steel bar truss 7 and the bottom formwork 8 gradually decreases, so as to avoid the situation that part of the melted steel bar truss 7 and bottom formwork 8 are extruded outwards due to thermal expansion and contraction, resulting in metal spatter. And the metal spatter will also cause the reduction of the fused part, affecting the welding effect. Therefore, the pressure adjusting member 53 plays a better role in improving the welding quality.

[0026] Each group of the resistance welding heads 51 has a plurality of the resistance welding heads 51. Therefore, a plurality of steel bar trusses 7 are placed on one bottom formwork 8, so that the plurality of steel bar trusses 7 are welded to the bottom formwork 8, and floor slabs with steel bar trusses 7 of different widths can be produced.

[0027] The adjusting member 53 includes: a plurality of telescopic bodies 531, a pump body member 532, and a pressure gauge. Each of the plurality of telescopic bodies 531 has a telescopic chamber. The telescopic body 531 can be a telescopic tube, so that the inside of the telescopic tube is the telescopic chamber. The pump body member 532 is used to inject and extract liquid from the telescopic chamber to make the telescopic body 531 extend and contract. The pump body member 532 can be a water pump. The pressure gauge is used to monitor the pressure of the telescopic chamber. The pressure gauge adopts the prior art.

[0028] When the two groups of resistance welding heads 51 approach each other and abut against the steel bar truss 7 and the bottom formwork 8, the pump body member 532 makes the telescopic chamber in the first pressure state. When at least half of the welding of the steel bar truss 7 is completed by the two groups of resistance welding heads 51, after the pump body member 532 slowly switches the telescopic chamber from the first pressure state to the second pressure state, the driving member 52 makes the two groups of resistance welding heads 51 move away from each other. Among them, the pump body member 532 injects liquid into the telescopic chamber to increase the pressure in the telescopic chamber to the first pressure state, while the pump body member 532 extracts part of the liquid from the telescopic chamber to slowly switch the pressure in the telescopic chamber from the first pressure state to the second pressure state. Thus, by using the pressure change in the telescopic chamber, the telescopic body 531 adjusts the pressure of the resistance welding head 51 pressing on the steel bar truss 7 and the bottom formwork 8 between the output end of the driving member 52 and the resistance welding head 51. Thus, the pressure is adjusted by using the hydraulic control pressure method, and the accuracy is higher. The adjusting member 53 can adopt a structure for adjusting the magnitude of the external force. Embodiment

[0029] The difference in Embodiment 2 is that: The adjusting member 53 further includes: a connecting body 533 and a connecting pipeline 534. The connecting body 533 is a box body, and the connecting body 533 forms a connecting chamber. The connecting pipeline 534 is used to communicate the connecting chamber with the plurality of telescopic chambers, so that the pressures in the plurality of telescopic chambers are the same as the pressure in the connecting chamber. In a specific solution, the connecting body 533 is arranged on the connecting frame 54, the telescopic body 531 is located between the connecting frame 54 and the resistance welding head 51, and the telescopic body 531 fixes the resistance welding head 51 and the connecting frame 54 together, and can be fixed by means of bolt connection. Since the driving member 52 drives the connecting frame 54 to move, the connecting frame 54 and the output end of the driving member 52 move synchronously. By providing the connecting body 533 and the connecting pipeline 534, the pressures of the plurality of resistance welding heads 51 pressing on the steel bar truss 7 and the bottom formwork 8 can be adjusted simultaneously. It is possible to produce the steel bar truss 7 floor slab with a larger production width while better ensuring the product quality.

[0030] The adjusting member 53 further includes: a first pressure relief member 535, a second pressure relief member 536, a first control member 537, and a second control member 538. Among them, two external connecting pipes are provided on the connecting body 533, and the first pressure relief member 535 and the second pressure relief member 536 are respectively arranged on the two external connecting pipes. The first pressure relief member 535 is communicated with the connecting chamber through the first control member 537, which is convenient for installing the first pressure relief member 535 and the second pressure relief member 536. Both the first pressure relief member 535 and the second pressure relief member 536 can adopt pressure relief valves. The pressures at which the first pressure relief member 535 and the second pressure relief member 536 relieve pressure are different. The first control member 537 and the second control member 538 are respectively arranged on the two external connecting pipes, so that the second pressure relief member 536 is communicated with the connecting chamber through the second control member 538. When the telescopic chamber is in the first pressure state, the first pressure relief member 535 is communicated with the connecting chamber. When the telescopic chamber is in the second pressure state, the second pressure relief member 536 is communicated with the connecting chamber. Through the arrangement of the first pressure relief member 535 and the second pressure relief member 536, the pressure at which multiple resistance welding heads 51 press on the steel bar truss 7 and the bottom formwork 8 can be adjusted more accurately and quickly. Both the first control member 537 and the second control member 538 can adopt electromagnetic control valves. By adjusting the opening and closing states of the first control member 537 and the second control member 538, one or all of the first pressure relief member 535 and the second pressure relief member 536 can be communicated with the connecting chamber, so that the first pressure state and the second pressure state in the connecting chamber and the telescopic chamber can be switched.

[0031] Among them, the pressure in the first pressure state in this solution is greater than the pressure in the second pressure state. When it is necessary to switch the connecting chamber from the first pressure state to the second pressure state, the first control member 537 closes slowly, and the second control member 538 opens slowly. As a result, the liquid in the connecting chamber will slowly release pressure outward at the second pressure relief member 536. Therefore, the pressure in the connecting chamber and the telescopic chamber can be gradually and slowly reduced, realizing a slow reduction in the pressure at which the resistance welding head 51 presses on the steel bar truss 7 and the bottom formwork 8, which is beneficial to the slow release of the melted part on the steel bar truss 7 and the bottom formwork 8, avoiding the melted part from overflowing outward or being extruded and splashing to form splashed metal due to thermal expansion and contraction, and better ensuring the welding quality. By using the arrangement of the first pressure relief member 535 and the second pressure relief member 536, the adjustment of the pressure can be made more simple, so it is not easy to have failures.

[0032] Among them, both the first control member 537 and the second control member 538 are valve body structures that can be remotely controlled, such as electric control valves.

[0033] In some other embodiments, the welding device 5 further includes a protective cover 55 and a flexible abutting member disposed at an end of the protective cover 55. The flexible abutting member is made of heat-resistant flexible rubber. The protective cover 55 has a protective chamber that houses a part of the resistance welding head 51. When the resistance welding head 51 abuts tightly against the bottom formwork 8 and / or the steel bar truss 7, the flexible abutting member abuts tightly against the bottom formwork 8 and / or the steel bar truss 7 to seal the protective chamber, and the driving member 52 is further configured to drive the protective cover 55 to move. Among them, the driving member 52 has two driving elements. One driving element drives the resistance welding head 51 to move, and the other drives the protective cover 55 to move. The driving element that drives the protective cover 55 to move can be an electric push rod. The electric push rod is disposed on the connecting frame 54. Therefore, the electric push rod can drive the protective cover 55 to move, that is, the protective cover 55 moves relative to the resistance welding head 51. Then, when the resistance welding head 51 abuts tightly against the bottom formwork 8, the flexible abutting member on the protective cover 55 abuts tightly against the bottom formwork 8, realizing that the resistance welding head 51 performs welding in a closed space, which is more conducive to the temperature rise of the bottom formwork 8 and the steel bar truss 7, thereby facilitating the improvement of the welding speed. At the same time, the metal splash can be completely prevented by the setting of the protective cover 55.

[0034] The flexible abutting member is provided because the steel bar truss 7 protrudes relative to the bottom formwork 8, so it will prevent the protective cover 55 from abutting tightly against the bottom formwork 8. By deforming, the flexible abutting member can completely fit the steel bar truss 7 and the bottom formwork 8, better seal the accommodation chamber, improve the temperature maintenance during the resistance welding process, and increase the temperature rise speed of the resistance welding, thereby facilitating the improvement of the welding quality and the welding speed. Embodiment

[0035] The difference in Embodiment 3 is that: An expansion body 57 with a through-port is arranged inside the protective cover 55. In one solution, the expansion body 57 can be an annular film structure. Therefore, the expansion body 57 can be switched between an expanded state and a contracted state. Among them, the expansion and contraction of the expansion body 57 can be achieved by injecting air or injecting liquid or using a plurality of electric push rods to drive the positions at the through-port of the expansion body 57 to move closer to or away from each other. The resistance welding head 51 penetrates through the through-port, and the through-port allows the resistance welding head 51 to pass through. When the expansion body 57 is in the expanded state, the through-port is at least narrowed to abut tightly against the resistance welding head 51. When the expansion body 57 is in the contracted state, the through-port is at least enlarged to be separated from the resistance welding head 51. The through-port is provided with a flexible scraping part that can be completely attached to the resistance welding head 51. The flexible scraping part is made of high-temperature resistant rubber material. Therefore, when the expansion body 57 is in the expanded state, the driving member 52 drives the protective cover 55 to move relative to the resistance welding head 51, and the flexible scraping part can be used to clean the resistance welding head 51, which is beneficial to preventing some stains from adhering to the resistance welding head 51 and avoiding affecting the efficiency of resistance welding. Among them, the expansion body 57 can be in the expanded state when the two groups of resistance welding heads 51 are approaching or stopped, and then the flexible scraping part abuts tightly against the outer wall of the resistance welding head 51, and the driving member 52 drives the protective cover 55 to move relative to the resistance welding head 51. Therefore, the flexible scraping part can move on the outer wall of the resistance welding head 51 to clean the resistance welding head 51.

[0036] Among them, there is liquid in the expansion body 57. Among them, the liquid preferably uses water. The water contacts the resistance welding head 51 through the expansion body 57, which can reduce the static electricity on the resistance welding head 51, avoid dust adhering to the resistance welding head 51, and is beneficial to improving the cleaning effect of the resistance welding head 51.

[0037] Specifically, the method of injecting liquid into the expansion body 57 is as follows: The expansion body 57 has an expansion chamber 571, and the pump body member 532 is also used to inject and extract liquid from the expansion chamber 571 to enable the expansion body 57 to be switched between the expanded state and the contracted state. Among them, the pump body member 532 is communicated with the telescopic chamber through the first liquid injection pipe 539, and the pump body member 532 is communicated with the expansion chamber 571 through the second liquid injection pipe 575. Control valves are arranged on both the first liquid injection pipe 539 and the second liquid injection pipe 575. Therefore, the elongation and shortening of the telescopic body 531 and the expansion and contraction of the expansion body 57 are controlled by the method of injecting and extracting liquid by the pump body member 532.

[0038] In addition, when the expansion body 57 expands, it can completely wrap the resistance welding head 51. Thus, when the resistance welding head 51 is not in use, the resistance welding head 51 can be protected by the way that the expansion body 57 completely wraps the resistance welding head 51.

[0039] Specifically, a diaphragm 574 is provided in the expansion chamber 571. The diaphragm 574 divides the expansion chamber 571 into an upper chamber 572 and a lower chamber 573. A third pressure relief member is provided on the diaphragm 574, and the upper chamber 572 and the lower chamber 573 are communicated through the third pressure relief member. When the expansion body 57 is in the expanded state, the part of the expansion body 57 located in the upper chamber 572 is separated from the resistance welding head 51, and the part of the expansion body 57 located in the lower chamber 573 is in contact with the resistance welding head 51. The pump body member 532 is used to inject and extract liquid from the upper chamber 572. Among them, the part of the expansion body 57 located in the upper chamber 572 is smaller than the part of the expansion body 57 located in the lower chamber 573. Therefore, the degree of expansion of the part of the expansion body 57 located in the upper chamber 572 is smaller than that of the part of the expansion body 57 located in the lower chamber 573. Then, when the expansion body 57 is in the expanded state, the part of the expansion body 57 located in the upper chamber 572 can be separated from the resistance welding head 51, and the part of the expansion body 57 located in the lower chamber 573 can be in contact with the resistance welding head 51. Among them, the third pressure relief member adopts a pressure relief valve. The degree of elastic deformation of the diaphragm 574 is smaller than that of the expansion body 57. The setting of the diaphragm 574 enables the upper part of the expansion body 57 to expand first, and then the lower part expands. And as long as the expansion body 57 is in use, the upper part of the expansion body 57 always remains expanded. Then, after the lower part of the expansion body 57 contracts, the lower part of the expansion body 57 is completely located below the upper part of the expansion body 57, and the dust and impurities adhered to the expansion body 57 are also easily shed downward, realizing automatic cleaning or timed cleaning of the expansion body 57. The purpose of the upper part of the expansion body 57 needing to expand and contract is that the continuous expansion and contraction of the expansion body 57 will generate air flow around, which helps to accelerate the circulation speed of the surrounding air, that is, it helps to dissipate heat from the resistance welding head 51. During the process of the upper part of the expansion body 57 expanding and contracting, liquid will continuously flow into and out of the upper chamber 572, thereby causing the expansion body 57 itself to vibrate slightly, which helps the dust and impurities on the lower part of the expansion body 57 to be better separated under the influence of the slight vibration.

[0040] In some solutions, the welding device 5 further includes a liquid extraction pump body 576 and a cooling tank 56, and the cooling tank 56 adopts the prior art. The liquid extraction pump body 576 is arranged on the connecting frame 54, and the liquid extraction pump body 576 is adjacent to the pump body component 532. A liquid discharge pipeline 577 is arranged on the liquid extraction pump body 576, and the liquid discharge pipeline 577 and the liquid extraction pump body 576 communicate the cooling tank 56 with the lower chamber 573. The liquid is in a circulating flow state in the flow mode of the cooling tank 56, the pump body component 532, the second liquid injection pipe 575, the upper chamber 572, the lower chamber 573, the liquid extraction pump body 576, the liquid discharge pipeline 577 and the cooling tank 56. Therefore, the lower chamber 573 can be expanded by stopping the liquid extraction of the liquid extraction pump body 576. Moreover, the circulating flow mode can also play a role in cooling the resistance welding head 51. When the resistance welding head 51 needs to be cleaned, it can play a role in cleaning and cooling, thus avoiding the situation that some dust and impurities melt and adhere due to the too high temperature of the resistance welding head 51 during cleaning. The pump body component 532 can also be connected to the cooling tank 56, so that the liquid injected into the connecting body 533 is the liquid in the cooling tank 56.

[0041] In some other solutions, the cooling tank 56 can be replaced with a heating tank, aiming to clean and heat the resistance welding head 51 during the normal use of the resistance welding head 51, so that the resistance welding head 51 can be better preheated and the welding effect is better when the resistance welding head 51 is welded.

[0042] Among them, the pump body component 532 and the first liquid injection pipe 539 inject liquid into the connecting chamber, and the pump body component 532 is externally connected to a water source, so that the liquid can be normally injected and discharged.

[0043] In addition, the pump body component 532 and the second liquid injection pipe 575 inject liquid into the upper chamber 572, and the liquid extraction pump body 576 and the liquid discharge pipeline 577 discharge the liquid in the lower chamber 573. The injection speed and the discharge speed of the liquid can be controlled, so that the water flow impacts the lower chamber 573 during the flowing process, causing the lower part of the expansion body 57 to deform unevenly, and strengthening the cleaning effect on the resistance welding head 51. In other solutions, two pump body components 532 can also be provided, one of which is used in cooperation with the first liquid injection pipe 539, and the other is used in cooperation with the second liquid injection pipe 575.

[0044] In some other embodiments, multiple groups of air pumps and air pipes are arranged on the connecting frame 54, and air is injected into and discharged from the protective cover 55 by using the air pumps and air pipes. The smoke and dust and some harmful gases generated by the resistance welding can be discharged. At the same time, the dust and impurities cleaned from the resistance welding head 51 by the expansion body 57 can also be discharged. The air pumps and air pipes make the air enter from the top of the protective cover 55 and discharge from the bottom of the protective cover 55, so that it can help the dust and impurities to separate from the lower part of the expansion body 57.

[0045] Specifically, the heat treatment device 6 includes a plurality of heating elements, and the plurality of heating elements are used to construct a plurality of heating regions with different temperatures. The temperatures of the plurality of heating regions gradually decrease along the conveying direction of the steel bar truss 7 and the bottom formwork 8. The temperatures of the plurality of heating regions are all lower than the temperature at the welding position of the steel bar truss 7 and the bottom formwork 8. The heating elements adopt industrial hot air blowers. The setting of the plurality of heating elements is beneficial to gradually reduce the temperature at the welding position of the steel bar truss 7, which is beneficial to improving the heat treatment effect. After the heat treatment device 6 processes the steel bar truss 7, the quality of the steel bar truss 7 is better.

[0046] In addition, the heating element may further include: a filter box and a pipeline network. The filter box is connected to an air pump and an air pipe, so that the welding waste gas in the protective cover 55 is discharged into the filter box by the air pump and the air pipe. A filter screen is arranged in the filter box, and the filter screen filters welding fumes and dust impurities. The pipeline network is a curved pipeline with a large extension range. The pipeline network is connected to the filter box, so that the high-temperature gas will enter the pipeline network through the filter box. The pipeline network is arranged near the heating element, so that the surrounding air can be preheated, and the air with a higher temperature contacts the steel bar truss 7 floor slab after passing through the heating element, so that the air can better contact the steel bar truss 7 floor slab at a specified temperature, improving the speed and efficiency of air heating, and making the utilization of thermal energy more perfect.

[0047] In some other solutions, the pipeline network in the above solution can also be laid under the steel bar truss 7 floor slab after welding, and the pipeline network laid in this way cooperates with or replaces the heating element to slowly cool down the steel bar truss 7 floor slab.

[0048] Specifically, when the resistance welding head 51 abuts against the steel bar truss 7 and the bottom formwork 8, the bent portion 81 is flattened to overlap with the bottom formwork 8; when the steel bar truss 7 and the bottom formwork 8 are welded together, molten welding spots are formed between the steel bar truss 7 and the bottom formwork 8; the molten welding spots cover the bent portion 81 and the steel bar truss 7 and the bottom formwork 8 at the edge of part of the bent portion 81.

[0049] Specifically, the preheating device 4 is used to heat the welding position of the steel bar truss 7 and the bottom formwork 8 to 180 - 280 °C; when the welding device 5 welds the steel bar truss 7, the temperature at the welding position of the steel bar truss 7 and the bottom formwork 8 is at least 600 - 800 °C. The preheating device 4 transfers the air at the welding device 5 to the preheating position of the steel bar truss 7 and the bottom formwork 8 by the preheating device 4. The arrangement of multiple air pumps, multiple air pipes, a filter box and a pipeline network can also be used to preheat the steel bar truss 7 and the bottom formwork 8 with high-temperature gas at the preheating position.

[0050] In some other embodiments, the cleaning device 2 is arranged on the flexible abutting member, and the cleaning device 2 forms a wear-resistant structure on the flexible abutting member to facilitate the cleaning of the steel bar truss 7. During actual use, first, the protective cover 55 is lowered to make the protective cover 55 abut tightly against the steel bar truss 7, and then the conveying device 1 conveys the steel bar truss 7, so that the steel bar truss 7 moves on the flexible abutting member, and the friction force between the flexible abutting member and the steel bar truss 7 cleans the steel bar truss 7.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A steel truss floor deck production line, characterized in that: include: A conveying device, used for conveying the steel bar truss and the bottom formwork to the bending device, the preheating device, the cleaning device, the welding device and the heat treatment device in sequence; The cleaning device, the preheating device, the welding device and the heat treatment device sequentially clean, preheat, weld and slowly cool down the steel bar truss and the bottom formwork; The bending device is at least used to form a plurality of upwardly protruding bending portions on the bottom template; the welding device is used to weld the steel bar truss tightly against the bending portions; Wherein, the welding device includes: one or two groups of resistance welding heads, a driving member that drives the resistance welding heads to press the steel truss and the bottom template, and an adjusting member arranged between the driving member and the resistance welding heads, and the adjusting member is at least used to adjust the pressure between the resistance welding heads and the steel truss and the bottom template.

2. The steel bar truss floor deck production line according to claim 1 is characterized by: Each group of the resistance welding joints has a plurality of the resistance welding joints; The regulating member comprises: a plurality of telescopic bodies, a pump body component and a pressure gauge; The plurality of telescopic bodies each have a telescopic chamber, the pump body member is used to inject and extract liquid into and from the telescopic chamber to extend and shorten the telescopic body; the pressure gauge is used to monitor the pressure of the telescopic chamber; When the two groups of resistance welding joints are close to each other and are pressed against the steel bar truss and the bottom template, the pump body component makes the telescopic chamber be in a first pressure state; When the two groups of resistance welding heads have completed at least half of welding the steel truss, the pump body component slowly switches the telescopic chamber from the first pressure state to the second pressure state, and the driving member moves the two groups of resistance welding heads away from each other.

3. The steel bar truss floor deck production line according to claim 2 is characterized by: The regulating member further comprises: a connecting body and a connecting pipeline; the connecting body forms a connecting chamber; The connecting pipeline is used to connect the connecting chamber with the plurality of telescopic chambers; The regulating member further comprises: a first pressure relief member, a second pressure relief member, a first control member and a second control member; The first pressure relief member is in communication with the connecting chamber via the first control member; the second pressure relief member is in communication with the connecting chamber via the second control member; When the telescopic chamber is in a first pressure state, the first pressure relief member is in communication with the connecting chamber; When the telescopic chamber is in a second pressure state, the second pressure relief member is communicated with the connecting chamber.

4. The steel bar truss floor deck production line according to claim 2 or 3, characterized in that: The welding device also includes a protective cover and a flexible abutment member arranged at the end of the protective cover; The protective cover has a protective chamber for accommodating a portion of the resistance welding head; When the resistance welding head is pressed against the bottom template and / or the steel bar truss, the flexible abutment member is pressed against the bottom template and / or the steel bar truss to seal the protective chamber; The driving member is also used to drive the protective cover to move.

5. The steel bar truss floor deck production line according to claim 4 is characterized in that: An expansion body with a through opening is arranged inside the protective cover; the through opening is for the resistance welding head to pass through; The expansion body can be switched between an expansion state and a contraction state; when the expansion body is in the expansion state, the through-hole is at least reduced in size and pressed against the resistance welding head; when the expansion body is in the contraction state, the through-hole is at least expanded and separated from the resistance welding head; The through opening is provided with a flexible scraper which can be completely fitted with the resistance welding head.

6. The steel bar truss floor deck production line according to claim 5 is characterized by: The expansion body has an expansion chamber therein, and the pump body component is also used to inject and extract liquid from the expansion chamber so that the expansion body switches between the expansion state and the contraction state.

7. The steel bar truss floor deck production line according to claim 6 is characterized by: A diaphragm is arranged in the expansion chamber, and the diaphragm divides the expansion chamber into an upper chamber and a lower chamber; A third pressure relief member is disposed on the diaphragm, and the upper chamber and the lower chamber are connected through the third pressure relief member; When the expansion body is in the expansion state, the portion of the expansion body located in the upper chamber is separated from the resistance welding head, and the portion of the expansion body located in the lower chamber is pressed against the resistance welding head; The pump body member is used to inject and extract liquid from the upper chamber.

8. The steel bar truss floor deck production line according to claim 1 is characterized by: The heat treatment device comprises a plurality of heating elements, wherein the plurality of heating elements are used to construct a plurality of heating areas with different temperatures; The temperatures of the plurality of heating areas gradually decrease along the conveying direction of the steel bar truss and the bottom formwork; The temperatures of the plurality of heating areas are all lower than the temperatures of the welding positions of the steel bar truss and the bottom formwork.

9. The steel bar truss floor deck production line according to claim 1, characterized in that: When the resistance welding joint is pressed against the steel bar truss and the bottom template, the bent portion is flattened to overlap with the bottom template; When the steel bar truss and the bottom template are welded together, the steel bar truss and the bottom template form molten welds; the molten welds cover the bending portion and a portion of the edge of the bending portion of the steel bar truss and the bottom template.

10. The steel bar truss floor deck production line according to claim 1, characterized in that: The preheating device is used to heat the welding position of the steel truss and the bottom template to 180-280°C; When the welding device welds the steel truss, the temperature of the welding position of the steel truss and the bottom template is at least 600-800°C; The preheating device transfers the air at the welding device to the position where the preheating device preheats the steel bar truss and the bottom template.

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