Multi-fork-angle self-adaptive adjustment welding seam heat treatment device in steel box girder limited space

Abstract

The invention discloses a multi-fork-angle self-adaptive adjustment welding seam heat treatment device in a steel box girder limited space, which comprises a supporting rod, connecting blocks are mounted on two sides of the supporting rod, a profiling plate is connected to the end part of the supporting rod, a heating belt is adhered to the outer side of the profiling plate, a second sleeve is mounted on one side of each connecting block, and a first sleeve is mounted on the other side of each connecting block. Adjusting rods are connected to the inner sides of the second sleeves in an embedded mode, and rotating cylinders are connected to the outer sides of the two second sleeves in a threaded mode. One end of the adjusting rod is connected with an adjusting mechanism, and the other end of the adjusting rod is provided with a limiting mechanism. Through the profiling plate and the adjusting mechanism, opening and closing adjustment can be conducted through the adjusting mechanism according to the three-fork included angles of different angles, it is ensured that the heating belt and the coil can be tightly attached to the included angles through cooperation with the coil, meanwhile, the induction heating mode of the coil is applied, electric energy is converted into heat energy, the heat energy directly acts on a welding joint, the heating efficiency is high, and the heating effect is good. The heating speed is high.

Description

Technical Field

[0001] The present invention relates to the technical field of heat treatment of steel box girders, and specifically to a heat treatment device for adaptively adjusting welds at multi-fork angles in a confined space of a steel box girder. Background Technique

[0002] The orthotropic steel bridge deck is an important part of modern steel bridges and is widely used in large-span highway and railway bridges. However, due to complex forces, many welds, initial defects, and directly bearing vehicle loads, the fatigue cracking phenomenon of the orthotropic steel bridge deck is relatively serious. Fatigue cracks are likely to occur at the welds between longitudinal ribs and the deck, the connections between the deck and webs, the connections between diaphragms and the deck, etc.; In recent years, many scholars have proposed various improved treatment measures from the perspectives of the local structural shape of the steel bridge deck and the load action effect. Although these treatment measures reduce the fatigue stress amplitude caused by vehicle loads from the perspectives of geometric mutation and load action effect, there is still potential to further improve the fatigue performance of the steel bridge deck from the welding perspective, that is, to eliminate or reduce the fatigue crack initiation and accelerated propagation caused by residual stress.

[0003] During the welding process of the orthotropic steel bridge deck, self-balanced internal stresses, namely welding residual stresses, are formed inside the welded components due to uneven heating and cooling. The welding residual stresses are tensile stresses in the weld area and compressive stresses in the surrounding areas. More and more studies have shown that residual stresses not only cause structural deformation, but also accelerate the initiation and propagation of fatigue cracks under fatigue loads.

[0004] Currently, the methods for reducing residual stresses mainly include annealing treatment, mechanical methods (hammering treatment), ultrasonic treatment, etc. Among them, the annealing treatment method is technically mature and widely used in the field of pressure vessels. Annealing treatment can effectively reduce residual stresses, but there is little research in the field of bridge steel structures. Therefore, a local heat treatment tooling can be designed according to the characteristics of the steel box girder for on-site annealing treatment to reduce welding residual stresses and reduce the risk of fatigue cracking of the steel box girder; In addition, since the inner deck, diaphragms, and longitudinal webs of the steel box girder are welded together and form a trident angle similar to a corner, usually after welding, heat treatment needs to be carried out on this trident angle. And the height of the steel box girder is at least more than two meters. The existing heat treatment methods usually involve climbing a ladder, then laying heating tapes and coils on the outer ring near the trident angle, and fixing the heating tapes and coils inside the steel box girder with electromagnets. Since the above methods are time-consuming and laborious, and it is easy to have safety accidents when climbing manually.

[0005] Therefore, it is necessary to provide a heat treatment device for adaptively adjusting welds at multi-fork angles in a confined space of a steel box girder to solve the above technical problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a multi-fork angle adaptive adjustment weld heat treatment device in a confined space of a steel box girder to solve the problems raised in the above background technology. The technical solution of the present invention provides a solution significantly different from the prior art for the technical problem that the prior art solution is too single.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A multi-fork angle adaptive adjustment weld heat treatment device in a confined space of a steel box girder, including a support rod, connection blocks are installed on both sides of the support rod, and a profiling plate is connected to the end of the support rod. A heating belt is adhered to the outside of the profiling plate. A second sleeve is installed on one side of the connection block, and an adjusting rod is embedded and connected inside the second sleeve. A rotating cylinder is threadedly connected to the outside of the two second sleeves; one end of the adjusting rod is connected to an adjusting mechanism, and a limiting mechanism is installed at the other end of the adjusting rod.

[0008] In a further embodiment, a chute is opened on one side of the profiling plate, and the chute is in a "T" shape. The two profiling plates form an opening and closing structure through a hinge shaft.

[0009] In a further embodiment, a coil is laid outside the heating belt to surround the three-fork angle and perform heat treatment on the angle through current induction.

[0010] In a further embodiment, a card slot is opened on the inner wall of the second sleeve.

[0011] In a further embodiment, a first installation groove for accommodating the limiting mechanism is opened on one side of the adjusting rod.

[0012] In a further embodiment, the adjusting mechanism includes a movable shaft connected to one end of the adjusting rod, and a slider is movably connected to one side of the movable shaft. The slider forms a sliding structure with the chute.

[0013] In a further embodiment, the limiting mechanism includes a pawl movably connected in the first installation groove, a spring is connected to the end of the pawl, a pull rope is also installed at the end of the pawl, and a pull ring is connected to the end of the pull rope. The pull rope is oriented by a connecting shaft in the first installation groove during the pulling process. The pawl forms a clamping structure with the card slot.

[0014] In a further embodiment, an anti-slip layer is pasted on the outside of one end of the rotating cylinder.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The present invention is provided with a profiling plate and an adjusting mechanism. The adjusting mechanism can be adjusted to open and close according to the included angles of different forks at different angles, and in cooperation with the coil, it ensures that the heating belt and the coil can be closely attached to the included angle. At the same time, by using the induction heating method of the coil, electrical energy is converted into heat energy, which directly acts on the welded joint, with high heating efficiency and fast heating speed, thereby shortening the heat treatment time, improving the heat treatment efficiency, and also being able to achieve uniform heating of the welded joint, avoiding local overheating or overcooling phenomena, improving the quality of the welded joint, and reducing the risk of fatigue cracks.

[0016] The present invention is provided with an adjusting mechanism and a limiting mechanism. This device does not require manual climbing to the upper inner side of the steel box girder for operation, effectively reducing the safety risk of manual operation and avoiding the safety hazards brought by high-altitude operations. The device has a simple structure, clear operation steps, and is easy to operate, improving work efficiency. The device can be reused, reducing production costs, and the limiting mechanism can also stably limit the heating belt and the coil, avoiding the instability caused by only using magnets to fix the heating belt and the coil in the prior art. Brief Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of a preferred embodiment of the multi-fork angle adaptive adjustment weld heat treatment device in the limited space of the steel box girder provided by the present invention; Figure 2 It is Figure 1 The installation structural diagram of the support rod and the profiling plate shown; Figure 3 It is Figure 1 The installation structural diagram of the heating belt and the coil and the support rod shown; Figure 4 It is Figure 1 The enlarged structural diagram at the A position shown; Figure 5 It is Figure 2 The enlarged structural diagram at the B position shown; Figure 6 It is the structural diagram of Embodiment 3; Figure 7 It is the structural diagram of Embodiment 3; Figures 8-9 It is the expanded structural diagram of two profiling plates.

[0018] In the figure: 1. Support rod; 2. Connecting block; 3. Profiling plate; 301. Chute; 4. Heating belt; 401. Coil; 5. Second sleeve; 501. Card slot; 6. Adjusting rod; 601. First installation groove; 7. Adjusting mechanism; 701. Moving shaft; 702. Slide block; 8. Limiting mechanism; 801. Pawl; 802. Spring; 803. Pull rope; 803a. Pull ring; 804. Connecting shaft; 9. Rotating cylinder; 901. Anti-slip layer. Detailed implementation manners

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1-9 , an embodiment provided by the present invention: a multi-fork angle adaptive adjustment weld heat treatment device in a confined space of a steel box girder, which includes a support rod 1, connection blocks 2 are installed on both sides of the support rod 1, and a profiling plate 3 is connected to the end of the support rod 1. A heating belt 4 is adhered to the outside of the profiling plate 3. A second sleeve 5 is installed on one side of the connection block 2, and an adjusting rod 6 is embedded and connected inside the second sleeve 5. A rotating cylinder 9 is threadedly connected to the outside of the two second sleeves 5. One end of the adjusting rod 6 is connected to an adjusting mechanism 7, and a limiting mechanism 8 is installed at the other end of the adjusting rod 6.

[0021] Embodiment 1 Please refer to Figures 1-5 , a chute 301 is opened on one side of the profiling plate 3, and the chute 301 is in a "T" shape. The two profiling plates 3 form an opening and closing structure through a hinge shaft. The adjusting mechanism 7 includes a movable shaft 701 connected to one end of the adjusting rod 6, and a slider 702 is movably connected to one side of the movable shaft 701. The slider 702 and the chute 301 form a sliding structure. The limiting mechanism 8 includes a pawl 801 movably connected in the first installation groove 601, and a spring 802 is connected to the end of the pawl 801. A coil 401 is laid outside the heating belt 4 for surrounding the three-fork angle and performing heat treatment on the angle through current induction; First, manually hold the support rod 1 tightly from the bending space in the middle of the adjusting rod 6. Then, place the heating belt 4 and the coil 401 on the back of the upper part of the support rod 1 against the vertical angle of the three-pronged angle. Next, continue to push the support rod 1 to the position of the top plate. At this time, use the right hand to push the right adjusting rod 6 upward, so that the slider 702 at the upper end of the adjusting rod 6 drives the corresponding profiling plate 3, heating belt 4, and coil 401 to open upward around the hinge shaft under the cooperation of the movable shaft 701 and the chute 301 until the profiling plate 3, heating belt 4, and coil 401 are attached to the right angle of the three-pronged angle inside the steel box girder. In order to stably attach the profiling plate 3 to the angle, the pawl 801 can be engaged and fixed with the card slot 501 under the elastic thrust of the spring 802, thus effectively preventing the adjusting rod 6, movable shaft 701, and slider 702 from moving downward under their own gravity, and then effectively fixing and attaching the right profiling plate 3 to the right angle of the three-pronged angle. Then use the left hand and fix and attach the left profiling plate 3, heating belt 4, and coil 401 to the left three-pronged angle in the same operation manner as above.

[0022] Example 2 Please refer to Figures 1-5 , which is different from Example 1 in that: a card slot 501 is provided on the inner wall of the second sleeve 5, and a first installation groove 601 for accommodating the limiting mechanism 8 is provided on one side of the adjusting rod 6. The limiting mechanism 8 includes a pawl 801 movably connected in the first installation groove 601, and a spring 802 is connected to the end of the pawl 801. A pull rope 803 is also installed at the end of the pawl 801, and a pull ring 803a is connected to the end of the pull rope 803. The pull rope 803 is oriented by the connecting shaft 804 in the first installation groove 601 during the pulling process. The pawl 801 and the card slot 501 form a latching structure. A coil 401 is laid outside the heating belt 4 for surrounding the three-pronged angle and performing heat treatment on the angle through current induction. An anti-slip layer 901 is pasted on the outer side of one end of the rotating cylinder 9; Finally, after all three angles are fixed and attached, the rotating cylinder 9 at the bottom end of the adjusting rod 6 can be rotated, so that the entire device is lengthened under the rotation of the rotating cylinder 9, so that the anti-slip layer 901 on the outer side of the bottom end of the rotating cylinder 9 abuts against the bottom plate inside the steel box girder, and then the heating belt 4 and the coil 401 outside the two profiling plates 3 and the support rod 1 can be effectively attached to the inner side of the three-pronged angle inside the steel box girder. Then, an electric current is passed through the coil 401 outside the heating belt 4 through the control button to perform induction heating treatment on the three-pronged angle inside the steel box girder; When the device needs to be released, the pull ring 803a and the pull rope 803 can be manually pulled outward, so as to drive the pawl 801 to flip outward along with the elastic contraction force of the spring 802, and disengage from the card slot 501. At the same time, the adjusting rod 6 is manually contracted. The adjusting rods 6 on both sides are contracted in the same way as above. Finally, the rotating cylinder 9 is rotated in the reverse direction to shorten the whole device, and then the device can be disassembled from the inner side of the steel box girder.

[0023] Embodiment 3 Please refer to Figures 6-7 , which is different from Embodiment 2 in that: a coil 401 is directly laid on the outer side of the profiling plate 3, and the heating belt 4 is removed. The purpose is that after the coil 401 generates heat by passing an electric current, it will directly heat the profiling plate 3, so that the heated profiling plate 3 and the coil 401 can efficiently perform heat treatment on the trifurcation angle.

[0024] Working principle: Since the inner top plate, diaphragm and longitudinal web of the steel box girder are welded into shape, and a trifurcation angle similar to a corner will be formed. Usually, after the welding is completed, heat treatment needs to be carried out on this trifurcation angle, and the height of the steel box girder is at least more than two meters. The existing heat treatment method is usually to climb a ladder, and then lay the heating belt 4 and the coil 401 on the outer ring close to the trifurcation angle, and use an electromagnet to fix the heating belt 4 and the coil 401 inside the steel box girder. Since the above method is time-consuming and laborious, and it is easy to cause safety accidents when climbing manually, the heat treatment device for the trifurcation angle of the present invention has been optimized and improved. The specific operation method is as follows: As Figures 1-5 shown, first, manually hold the support rod 1 from the bending space in the middle of the adjusting rod 6, and then place the heating belt 4 and the coil 401 on the back of the upper part of the support rod 1 against the vertical angle of the trifurcation angle. Then continue to push the support rod 1 to the top plate position. At this time, use the right hand to push the right adjusting rod 6 upward, so that the slider 702 at the upper end of the adjusting rod 6 drives the corresponding profiling plate 3, heating belt 4 and coil 401 to open upward around the hinge shaft under the cooperation of the movable shaft 701 and the chute 301 until the profiling plate 3, heating belt 4 and coil 401 are attached to the right angle of the trifurcation angle inside the steel box girder. In order to stably attach the profiling plate 3 to the angle, the pawl 801 can be engaged and fixed with the card slot 501 under the elastic thrust of the spring 802, so as to effectively prevent the problems that the adjusting rod 6, the movable shaft 701 and the slider 702 move downward under their own gravity, and then effectively fix and attach the right profiling plate 3 to the right angle of the trifurcation angle; Then use the left hand, and fix and attach the profiling plate 3, heating belt 4 and coil 401 on the left side to the left trifurcation angle in the same operation manner as above; Finally, after all three included angles are fixedly fitted, the rotating cylinder 9 at the bottom end of the adjusting rod 6 can be rotated, so that the whole device is lengthened under the action of the rotation of the rotating cylinder 9, so that the anti-slip layer 901 on the outer side of the bottom end of the rotating cylinder 9 abuts against the bottom plate inside the steel box girder. Furthermore, the heating belts 4 and the coils 401 on the outer sides of the two profiling plates 3 and the support rods 1 can be effectively fitted to the inner side of the three-way included angle inside the steel box girder. Then, an electric current is passed through the coil 401 on the outer side of the heating belt 4 by controlling the button to perform induction heating treatment on the three-way included angle inside the steel box girder; When the device needs to be disassembled, the pull ring 803a and the pull rope 803 can be manually pulled outwards, so as to drive the pawl 801 to flip outwards of the adjusting rod 6 in cooperation with the elastic contraction force of the spring 802 and disengage from the card slot 501. At the same time, the adjusting rod 6 is manually contracted, and the two side adjusting rods 6 are contracted in the same way as above. Finally, the rotating cylinder 9 is rotated in the reverse direction to shorten the whole device, and then the device can be disassembled from the inside of the steel box girder. Thus, a series of work is completed.

[0025] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0026] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A multi-fork angle adaptive adjustment weld heat treatment device in a confined space of a steel box girder, comprising a support rod (1), connecting blocks (2) are installed on both sides of the support rod (1), and a profiling plate (3) is connected to the end of the support rod (1). A heating belt (4) is adhesively attached to the outer side of the profiling plate (3). A second sleeve (5) is installed on one side of the connecting block (2), and an adjusting rod (6) is embedded and connected inside the second sleeve (5). The outer sides of the two second sleeves (5) are threadedly connected to a rotating cylinder (9); It is characterized in that: One end of the adjusting rod (6) is connected to an adjusting mechanism (7), and a limiting mechanism (8) is installed at the other end of the adjusting rod (6).

2. The multi-pronged angle adaptive adjustment weld heat treatment device in a limited space of a steel box girder according to claim 1, wherein: A chute (301) is formed on one side of the profiling plate (3), and the chute (301) is in a "T" shape. The two profiling plates (3) form an opening and closing structure through a hinge shaft.

3. The multi-fork angle adaptive adjustment weld heat treatment device in the limited space of a steel box girder according to claim 1, wherein: A coil (401) is laid outside the heating belt (4) to surround the three-fork angle, and the angle is heat-treated by current induction.

4. The multi-fork angle adaptive adjustment weld heat treatment device in a confined space of a steel box girder according to claim 1, characterized in that: A clamping groove (501) is formed on the inner wall of the second sleeve (5).

5. The multi-fork angle adaptive adjustment weld heat treatment device in a confined space of a steel box girder according to claim 4, characterized in that: A first installation groove (601) for accommodating the limiting mechanism (8) is formed on one side of the adjusting rod (6).

6. The multi-fork angle adaptive adjustment weld heat treatment device in the confined space of a steel box girder according to claim 2, characterized in that: The adjusting mechanism (7) includes a movable shaft (701) connected to one end of the adjusting rod (6), and a slider (702) is movably connected to one side of the movable shaft (701). The slider (702) and the chute (301) form a sliding structure.

7. The multi-pronged angle adaptive adjustment weld heat treatment device in a confined space of a steel box girder according to claim 5, characterized in that: The limiting mechanism (8) includes a pawl (801) movably connected in the first installation groove (601), a spring (802) is connected to the end of the pawl (801), a pull rope (803) is also installed at the end of the pawl (801), and a pull ring (803a) is connected to the end of the pull rope (803). The pull rope (803) is oriented by a connecting shaft (804) in the first installation groove (601) during the pulling process. The pawl (801) and the clamping groove (501) form a clamping structure.

8. A multi-fork angle adaptive adjustment weld heat treatment device in a limited space of a steel box girder according to claim 1, characterized in that: An anti-slip layer (901) is pasted on the outer side of one end of the rotating cylinder (9).

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