A post-weld insulation system for main chord pipes

Abstract

The present invention discloses a post-weld insulation system for a main chord pipe, comprising a conveying device and a plurality of pairs of insulation bins, each pair of insulation bins being arranged on both sides of the conveying device, and the insulation bins on the same side being connected in sequence, and when the conveying device conveys the welded main chord pipe to one of the pairs of insulation bins, the annular welds at both ends of the main chord pipe are located in the insulation bins on the corresponding side, and the temperature in each pair of insulation bins is sequentially reduced along the conveying direction of the main chord pipe. The insulation system has the functions of reducing welding stress concentration, preventing weld cracking, improving the overall strength of the main chord pipe, and facilitating energy saving and temperature control.

Description

Technical Field

[0001] The invention mainly relates to a main chord tube forming technology, and in particular to a post-welding thermal insulation system for the main chord tube. Background Art

[0002] A crane is a type of engineering machinery that can perform operations such as lifting, transporting, loading and unloading of materials. It is widely used in construction, transportation, ports, energy, farmland irrigation and other fields, such as building bridges, installing power generation equipment, shipbuilding, erecting wind turbines, etc.

[0003] In recent years, with the development of large-scale engineering projects such as petrochemical, nuclear power and steel, the demand for hoisting of super-large equipment has increased, which has put forward higher requirements on the lifting height and lifting capacity of cranes. The boom is one of the important structural parts of the crane, and the performance of the boom has an important influence on the lifting height and lifting capacity of the crane.

[0004] The boom is made up of main chord tubes, which mainly include steel pipes. Joints are connected to the ends of the steel pipes, and ear hinges are welded on the joints. The ear hinges are used to splice main chord tubes of different sections. Since the ear hinges and the ends of the steel pipes are circularly welded, the circular welds are prone to welding stress concentration and weld cracking after welding the joints at both ends of the pipe parts, which greatly affects the performance of the boom. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a post-weld insulation system for the main chord pipe which can reduce welding stress concentration, prevent weld cracking, improve the overall strength of the main chord pipe, and facilitate energy saving and temperature control.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A post-weld insulation system for a main chord pipe comprises a conveying device and a plurality of pairs of insulation bins, each pair of the insulation bins being arranged on both sides of the conveying device, and the insulation bins on the same side being butted in sequence, and when the conveying device conveys the welded main chord pipe to one of the pairs of insulation bins, the annular welds at both ends of the main chord pipe are located in the insulation bins on the corresponding side, and the temperature in each pair of insulation bins decreases in sequence along the conveying direction of the main chord pipe.

[0008] As a further improvement of the above technical solution:

[0009] The insulation bin includes a bin body, which is provided with an insulation cavity. The bin body is provided with three openings for the main chord tube to transport into the insulation cavity in the main chord tube transport direction and in the direction opposite to the main chord tube, and each opening is provided with a door curtain that can be opened and closed.

[0010] The two door curtains of the warehouse body in the conveying direction of the main chord tube are arranged as soft curtains, and the door curtain of the warehouse body facing the main chord tube is arranged with a lifting plate.

[0011] The warehouse body comprises a heat-insulating layer and a heating cavity, and the heating cavity is located between the heat-insulating layer and the heat-insulating cavity.

[0012] The heating cavity surrounds the heat preservation cavity except for the opening.

[0013] The thermal insulation layer comprises an outer shell, an inner shell and a thermal insulation lining, and the thermal insulation lining is filled between the outer shell and the inner shell.

[0014] The heat-insulating lining is provided with a heating element extending into the heating cavity.

[0015] The thermal insulation lining is provided with a mounting hole, the heating element is configured as an electric heating tube, and the electric heating tube is installed in the mounting hole and extends into the heating cavity.

[0016] The shell is provided with a shield for covering the electric heating tube.

[0017] It also includes a moving trolley and a track, wherein the track is laid on the side of the conveying device, the moving trolley is installed on the track, the moving direction of the moving trolley is perpendicular to the conveying direction of the conveying device, and the heat preservation bin is installed on the moving trolley.

[0018] The conveying device comprises a pair of fixed seats, a sprocket transmission pair is arranged between the two fixed seats, and a driving motor for driving the sprocket transmission pair to operate is installed on one of the fixed seats.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] The post-weld insulation system for the main chord pipe of the present invention comprises a conveying device and a plurality of pairs of insulation bins, each pair of insulation bins being arranged on both sides of the conveying device, and the insulation bins on the same side being connected in sequence. When the conveying device conveys the welded main chord pipe to the position of one pair of insulation bins, the annular welds at both ends of the main chord pipe are located in the insulation bins on the corresponding side, and the temperature in each pair of insulation bins decreases in sequence along the conveying direction of the main chord pipe. In this structure, the temperature in each pair of insulation bins decreases in sequence along the conveying direction of the main chord pipe. When the insulation system is in operation, the conveying device conveys the welded main chord pipe to the high-temperature insulation bin position to ensure that the annular welds at both ends of the main chord pipe are located in the insulation bins on the corresponding side. The annular welds at both ends of the main chord pipe are insulated and aged by the insulation bins. After a certain period of insulation, they are conveyed in sequence to each pair of insulation bins with decreasing temperatures for insulation aging. This can reduce welding stress concentration and prevent weld cracking, thereby improving overall strength. This temperature-decreasing insulation aging method has the advantages of good insulation and energy-saving effects, stable temperature uniformity, and accurate temperature control. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the post-weld thermal insulation system for the main chord pipe of the present invention.

[0022] Figure 2 It is a schematic diagram of the main structure of the post-weld insulation system for the main chord pipe of the present invention.

[0023] Figure 3 It is a three-dimensional structural schematic diagram of the post-weld insulation system for the main chord pipe of the present invention (the main chord pipe is not shown).

[0024] Figure 4 It is a schematic diagram of the main cross-sectional structure of the insulation bin in the post-weld insulation system for the main chord pipe of the present invention.

[0025] Figure 5 The invention is a schematic side sectional structural diagram of a heat preservation bin in a post-weld heat preservation system for a main chord pipe.

[0026] The symbols in the figure represent:

[0027] 1. Conveying device; 11. Fixed seat; 12. Sprocket transmission pair; 13. Driving motor; 2. Insulation bin; 21. Bin body; 211. Insulation layer; 2111. Outer shell; 2112. Inner shell; 2113. Insulation lining; 21131. Mounting hole; 212. Heating chamber; 22. Insulation chamber; 23. Opening; 24. Door curtain; 3. Main chord; 4. Heating element; 5. Protective cover; 6. Moving trolley; 7. Track. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Figures 1 to 5 An embodiment of the post-weld insulation system for the main chord pipe of the present invention is shown, comprising a conveying device 1 and a plurality of pairs of insulation bins 2, each pair of insulation bins 2 being evenly arranged on both sides of the conveying device 1, and the insulation bins 2 on the same side are connected in sequence, when the conveying device 1 conveys the welded main chord pipe 3 to the position of one pair of insulation bins 2, the annular welds at both ends of the main chord pipe 3 are located in the insulation bins 2 on the corresponding side, and the temperature in each pair of insulation bins 2 decreases in sequence along the conveying direction of the main chord pipe 3. In this structure, the temperature in each pair of insulation bins 2 decreases in sequence along the conveying direction of the main chord tube 3. When the insulation system is in operation, the conveying device 1 conveys the welded main chord tube 3 to the position of the high-temperature insulation bin 2 to ensure that the annular welds at both ends of the main chord tube 3 are located in the insulation bin 2 on the corresponding side. The annular welds at both ends of the main chord tube 3 are insulated and aged by the insulation bin 2. After a certain period of insulation, they are conveyed in sequence to each pair of insulation bins 2 with decreasing temperature for corresponding insulation aging, which can reduce welding stress concentration and prevent weld cracking, thereby improving the overall strength. This temperature-decreasing insulation aging method has the advantages of good insulation and energy-saving effects, stable temperature uniformity, and accurate temperature control.

[0030] In this embodiment, the heat preservation bin 2 includes a bin body 21, and a heat preservation cavity 22 is provided on the bin body 21. The bin body 21 is provided with three openings 23 for the main chord tube 3 to be transported into the heat preservation cavity 22 in the transport direction of the main chord tube 3 and in the direction facing the main chord tube 3, and each opening 23 is provided with a door curtain 24 that can be opened and closed. In this structure, the three openings 23 make the heat preservation cavity 22 a U-shaped structure, which can ensure the input and output of the main chord tube 3; and the provision of the door curtain 24 can realize the opening and closing of each opening 23, which can ensure the input and output of the main chord tube 3 while ensuring the heat preservation effect.

[0031] In this embodiment, the two door curtains 24 of the warehouse body 21 in the conveying direction of the main chord tube 3 are set as soft curtains, and the warehouse body 21 is provided with a lifting plate on the door curtain 24 facing the main chord tube 3. In order to ensure the continuous conveying of the main chord tube 3, the two door curtains 24 in the conveying direction of the main chord tube 3 are set as soft curtains with deformation function, which can adapt to the forced conveying of the main chord tube 3, and the door curtain 24 facing the main chord tube 3 is provided with a lifting plate, which is filled with full fiber products, raised and lowered by an electric mechanism, with travel limit and safety electrical interlock, and the furnace door and furnace mouth are sealed with a customized special-shaped rubber tube and pressed by a cylinder locking mechanism.

[0032] In this embodiment, the warehouse body 21 includes an insulation layer 211 and a heating chamber 212, and the heating chamber 212 is located between the insulation layer 211 and the insulation chamber 22. In this structure, the heating chamber 212 is a cavity structure, and the insulation layer 211 forms an isolation, so that the temperature is transferred to the insulation chamber 22, thereby improving the insulation effect.

[0033] In this embodiment, the heating chamber 212 surrounds the heat preservation chamber 22 except the opening 23. This arrangement allows the heat preservation chamber 22 to be surrounded in three directions, thereby achieving temperature transfer in three directions.

[0034] In this embodiment, the thermal insulation layer 211 includes an outer shell 2111, an inner shell 2112 and a thermal insulation lining 2113, and the thermal insulation lining 2113 is filled between the outer shell 2111 and the inner shell 2112. The outer shell 2111, the inner shell 2112 and the thermal insulation lining 2113 form a three-layer structure, which further improves the thermal insulation effect.

[0035] In this embodiment, a heating element 4 extending into the heating chamber 212 is mounted on the heat-insulating lining 2113. The heating chamber 212 is heated by the heating element 4, and the temperature is then transferred to the heat-insulating chamber 22, and the structure is simple and reliable.

[0036] In this embodiment, a mounting hole 21131 is provided on the thermal insulation lining 2113, and the heating element 4 is configured as an electric heating tube, which is installed in the mounting hole 21131 and extends into the heating chamber 212. In this structure, the heating chamber 212 is heated by the electric heating tube, which is installed in the mounting hole 21131, and can be quickly disassembled and assembled, which is convenient for maintenance and replacement.

[0037] In this embodiment, a shield 5 for covering the electric heating tube is installed on the housing 2111. The shield 5 covers the mounting hole 21131 and the heating element 4 to ensure the aesthetic appearance, and on the other hand, it can ensure sealing to prevent temperature loss from the mounting hole 21131.

[0038] In this embodiment, a moving trolley 6 and a track 7 are also included. The track 7 is laid on the side of the conveying device 1. The moving trolley 6 is installed on the track 7. The moving direction of the moving trolley 6 is perpendicular to the conveying direction of the conveying device 1. The heat preservation bin 2 is installed on the moving trolley 6. In this structure, the movement of the moving trolley 6 on the track 7 can drive the movement of the heat preservation bin 2, which is equivalent to adjusting the distance between the two heat preservation bins 2 to adapt to the main chord pipes 3 of different pipe lengths, greatly improving its adaptability.

[0039] In this embodiment, the conveying device 1 includes a pair of fixed seats 11, a sprocket transmission pair 12 is arranged between the two fixed seats 11, and a driving motor 13 for driving the sprocket transmission pair 12 is installed on one of the fixed seats 11. In this structure, the conveying device 1 is provided with a pair of sprocket transmission pairs 12 for carrying the main chord tube 3, and the driving motor 13 drives the sprocket transmission pair 12 to operate, thereby driving the main chord tube 3 to move, thereby realizing the conveying function of the main chord tube 3.

[0040] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A post-weld insulation system for a main chord pipe, characterized in that: It comprises a conveying device (1) and a plurality of pairs of insulation bins (2), each pair of the insulation bins (2) being arranged on both sides of the conveying device (1), and the insulation bins (2) on the same side being butted in sequence, and when the conveying device (1) conveys the welded main chord tube (3) to the position of one pair of insulation bins (2), the annular welds at both ends of the main chord tube (3) are located in the insulation bin (2) on the corresponding side, and the temperature in each pair of insulation bins (2) decreases in sequence along the conveying direction of the main chord tube (3); The heat preservation bin (2) comprises a bin body (21), a heat preservation chamber (22) is provided on the bin body (21), and the bin body (21) is provided with three openings (23) in the conveying direction of the main chord tube (3) and in the direction facing the main chord tube (3) for conveying the main chord tube (3) into the heat preservation chamber (22), and each opening (23) is provided with a door curtain (24) that can be opened and closed; The two door curtains (24) of the warehouse body (21) in the conveying direction of the main chord tube (3) are set as soft curtains, and the door curtain (24) of the warehouse body (21) facing the main chord tube (3) is provided with a lifting plate; It also comprises a moving trolley (6) and a track (7), wherein the track (7) is laid on the side of the conveying device (1), the moving trolley (6) is mounted on the track (7), the moving direction of the moving trolley (6) is perpendicular to the conveying direction of the conveying device (1), and the heat preservation bin (2) is mounted on the moving trolley (6); The conveying device (1) comprises a pair of fixed seats (11), a sprocket transmission pair (12) is arranged between the two fixed seats (11), and a driving motor (13) for driving the sprocket transmission pair (12) is installed on one of the fixed seats (11).

2. The post-weld insulation system for main chord pipe according to claim 1, characterized in that: The warehouse body (21) comprises a heat-insulating layer (211) and a heating chamber (212); the heating chamber (212) is located between the heat-insulating layer (211) and the heat-insulating chamber (22); and the heating chamber (212) surrounds the heat-insulating chamber (22) except for the opening (23).

3. The post-weld insulation system for main chord pipe according to claim 2, characterized in that: The thermal insulation layer (211) comprises an outer shell (2111), an inner shell (2112) and a thermal insulation lining (2113), and the thermal insulation lining (2113) is filled between the outer shell (2111) and the inner shell (2112).

4. The post-weld insulation system for main chord pipe according to claim 3, characterized in that: The thermal insulation lining (2113) is provided with a heating element (4) extending into the heating chamber (212).

5. The post-weld insulation system for main chord pipe according to claim 4, characterized in that: The thermal insulation lining (2113) is provided with a mounting hole (21131), and the heating element (4) is configured as an electric heating tube, which is installed in the mounting hole (21131) and extends into the heating chamber (212).

6. The post-weld insulation system for main chord pipe according to claim 5, characterized in that: The housing (2111) is provided with a protective cover (5) for covering the electric heating tube.

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