Rigid beam structure system of boiler

Abstract

The utility model relates to the technical field of water cooled walls of boilers, in particular to a rigid beam structure system of a boiler, which comprises a cross beam, a longitudinal beam, an upper lap joint component, a lower lap joint component, an upper connecting plate, a lower connecting plate, a header and a water cooled wall. The cross beam and the lower lap joint assembly are connected to the lower end of the longitudinal beam. The upper end of the longitudinal beam is connected with the upper lap joint assembly; the upper connecting plate is hinged to the upper lap joint assembly. The upper connecting plate can move along the hinged shaft; the lower connecting plate is hinged to the lower lap joint assembly. The lower connecting plate can move along the hinged shaft; the collecting box is connected with the upper connecting plate; the water cooling wall is connected with the lower connecting plate; and the header is connected with the water-cooled wall. A first allowance space for expansion of the header is reserved on the upper lap joint assembly and the upper pin shaft so as to counteract or reduce tension and torsion loads generated by expansion force and expansion displacement of the header, the service life of the connecting joint of the rigid beam structure system is prolonged, stable connection of the rigid beam and the header is guaranteed, and the service life of the rigid beam structure system is prolonged. Therefore, connection nodes are prevented from being damaged earlier than water-cooled wall structural members.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler water-cooled walls, in particular to a rigid beam structure system of a boiler. Background Art

[0002] At present, the connection node structure system of rigid beam, top header and side wall water-cooled wall, that is, the rigid beam structure system, has been widely used in the biomass boiler industry. In the past, the horizontal section of the rigid beam was welded with the vertical section of the rigid beam at this node, and the upper and lower ends of the vertical section rigid beam were welded with upper vertical lap plates and lower vertical lap plates, which were respectively welded to the boiler top header and side wall water-cooled wall to form welds, and then form a complete rigid beam structure system. This ensures that the water-cooled wall will not be damaged, and ensures the sealing of the boiler, orderly expansion and load transfer.

[0003] Since the joints of the rigid beam nodes are all welded on site, it is found in actual application that during the thermal expansion of the boiler, the welds at the joints between the rigid beam and the top header and the welds at the joints between the rigid beam and the side wall water-cooled wall are often damaged before the water-cooled wall structural components, causing the entire rigid beam structural system to fail and fail to meet the design requirements. After analysis, during the heating process of the biomass boiler, the thermal expansion direction of the top header is upward, and it also has expansion in the front-to-back direction (horizontal direction), while the thermal expansion direction of the side wall water-cooled wall is only upward expansion, resulting in different expansion directions and expansion amounts of the top header and the side wall water-cooled wall.

[0004] Therefore, the rigid beam node design is difficult to effectively release the thermal stress and thermal displacement generated by the components when heated because the rigid beam, top header and side wall water-cooled wall are all welded. Therefore, under the tensile and torsion loads generated by the expansion force and expansion displacement, the node welds between the rigid beam and the top header and water-cooled wall are prematurely damaged before the water-cooled wall, causing the rigid beam to lose its proper function and making it difficult to ensure the overall good stress performance and safety of the boiler. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the above shortcomings and deficiencies of the prior art, the utility model provides a rigid beam structure system of a boiler, which solves the technical problem that the node welds of the existing rigid beam structure system are easily damaged before the water-cooled wall structural components, causing the rigid beam structure system to fail.

[0007] (II) Technical solution

[0008] In order to achieve the above-mentioned purpose, the rigid beam structure system of the boiler of the utility model comprises a cross beam, a longitudinal beam, an upper lap assembly, a lower lap assembly, an upper connecting plate, a lower connecting plate, a header and a water-cooled wall;

[0009] The cross beam and the lower lap assembly are both connected to the lower end of the longitudinal beam; the upper end of the longitudinal beam is connected to the upper lap assembly;

[0010] The upper connecting plate is hinged to the upper lap assembly; and the upper connecting plate can move along the hinge axis;

[0011] The lower connecting plate is hinged to the lower lap assembly; and the lower connecting plate can move along the hinge axis;

[0012] The header is connected to the upper connecting plate; the water-cooled wall is connected to the lower connecting plate; and the header is connected to the water-cooled wall.

[0013] Optionally, the upper lap assembly includes an upper lap plate and an upper pin shaft;

[0014] The upper lap plate is connected to the upper end of the longitudinal beam;

[0015] The upper pin shaft is connected to the upper lap plate; a pair of upper connecting plates are arranged on both sides of the upper lap plate in a one-to-one correspondence; and a pair of upper connecting plates are movably connected to the upper pin shaft.

[0016] Optionally, a rectangular groove is provided on the upper connecting plate; the upper pin is a rectangular pin;

[0017] The rectangular pin is movably connected to the rectangular groove; the rectangular pin can move in the rectangular groove along the hinge axis, and the rectangular pin can rotate around its own axis.

[0018] Optionally, the upper lap plate is clamped and welded to the top end of the longitudinal beam.

[0019] Optionally, the lower lap assembly includes a lower lap plate and a lower pin shaft;

[0020] The lower lap plate is connected to the lower end of the longitudinal beam;

[0021] The lower pin shaft is connected to a pair of lower connecting plates; a pair of lower lap plates are arranged on both sides of a pair of lower connecting plates in a one-to-one correspondence; and a pair of lower lap plates are hinged to the lower pin shaft.

[0022] Optionally, the header can drive the upper connecting plate and the upper overlapping assembly to rise and fall in the vertical direction;

[0023] The water-cooled wall can drive the lower connecting plate and the lower overlapping assembly to rise and fall in the vertical direction.

[0024] Optionally, the cross beam and the longitudinal beam are I-beams.

[0025] (III) Beneficial effects

[0026] The beneficial effects of the utility model are:

[0027] On the basis of the existing rigid beam structure system, an upper connecting plate and a lower connecting plate are newly added, and the connection method of the weld of the existing rigid beam structure system is replaced by the connection method of the hinged structure. The ingenious setting of the hinged structure enables the header to drive the upper connecting plate to move along the hinge axis on the upper pin shaft when the header expands in the horizontal direction, that is, the first margin space when the header expands is reserved on the upper lap joint assembly and the upper pin shaft to offset or reduce the tensile and torsion loads generated by the expansion force and expansion displacement of the header, extend the service life of the connection nodes of the rigid beam structure system, ensure the stable connection between the rigid beam and the header, and effectively avoid the connection nodes from being damaged earlier than the water-cooled wall structural components, thereby ensuring the overall good stress performance and safety of the boiler. The same applies to the lower lap joint assembly, the lower connecting plate and the water-cooled wall, which will not be repeated.

[0028] Except for the hinged components of the upper lap joint and the lower lap joint, the remaining components of the rigid beam structure system can be welded in advance in the factory. This not only ensures the quality of the welds, but also reduces the amount of on-site welding, shortens the installation period, and saves installation costs. While creating considerable economic benefits, it also contributes to "protecting the environment, saving energy and reducing emissions." BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front view of the rigid beam structure system of the boiler of the utility model;

[0030] Figure 2 It is a side view of the rigid beam structure system of the boiler of the utility model;

[0031] Figure 3 It is a top view of the rigid beam structure system of the boiler of the utility model.

[0032] [Description of Reference Numerals]

[0033] 1: cross beam; 2: longitudinal beam; 3: lower lap plate; 4: lower connecting plate; 5: upper lap plate; 6: lower pin shaft; 7: upper pin shaft; 8: upper connecting plate; 9: header; 10: water-cooled wall. DETAILED DESCRIPTION

[0034] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0035] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] See also Figure 1 The utility model provides a rigid beam structure system of a boiler, which includes a cross beam 1, a longitudinal beam 2, an upper lap assembly, a lower lap assembly, an upper connecting plate 8, a lower connecting plate 4, a header 9 and a water-cooled wall 10; the cross beam 1 and the lower lap assembly are both connected to the lower end of the longitudinal beam 2; the upper end of the longitudinal beam 2 is connected to the upper lap assembly; the upper connecting plate 8 is hinged to the upper lap assembly; and the upper connecting plate 8 can move along the hinge axis; the lower connecting plate 4 is hinged to the lower lap assembly; and the lower connecting plate 4 can move along the hinge axis; the header 9 is connected to the upper connecting plate 8; the water-cooled wall 10 is connected to the lower connecting plate 4; and the header 9 is connected to the water-cooled wall 10. The hinge axis is the axis direction of the upper pin 7.

[0039] On the basis of the existing rigid beam structure system, an upper connecting plate 8 and a lower connecting plate 4 are newly added, and the upper connecting plate 8 is hinged to the upper lap assembly, and the lower connecting plate 4 is hinged to the lower lap assembly, so that the rigid beam structure system is connected into a whole. On this basis, the upper connecting plate 8 and the lower connecting plate 4 are further enabled to move along the hinge axis, and the connection method of the weld of the existing rigid beam structure system is replaced by the connection method of the hinge structure. The ingenious setting of the hinge structure enables the header 9 to drive the upper connecting plate 8 to move along the hinge axis on the upper pin shaft 7 when the header 9 expands in the horizontal direction, that is, the first margin space is reserved on the upper lap assembly and the upper pin shaft 7 when the header 9 expands, so as to offset or reduce the tensile and torsion loads generated by the expansion force and expansion displacement of the header 9, extend the service life of the connection node of the rigid beam structure system, ensure the stable connection between the rigid beam and the header, and effectively avoid the connection node from being damaged earlier than the water-cooled wall structural components, thereby ensuring the overall good stress performance and safety of the boiler. The lower lap assembly, the lower connecting plate 4 and the water-cooled wall 10 are similar and will not be described in detail.

[0040] Except for the hinged components of the upper lap joint and the lower lap joint, the remaining components of the rigid beam structure system can be welded in advance in the factory. This not only ensures the quality of the welds, but also reduces the amount of on-site welding, shortens the installation period, and saves installation costs. While creating considerable economic benefits, it also contributes to "protecting the environment, saving energy and reducing emissions."

[0041] When the rigid beam structure system is installed on site, all components are prefabricated in the factory. Except for the hinged components, the remaining components are welded in the factory. Finally, the rigid beam structure system is prefabricated into rigid beam modules and header water-cooled wall modules in the factory. At the construction site, only the hinged structure at the joint of the rigid beam module and the header water-cooled wall module needs to be hinged and welded, which greatly reduces the labor intensity at the construction site and improves the installation efficiency.

[0042] like Figure 2As shown, the upper lap assembly includes an upper lap plate 5 and an upper pin 7; the upper lap plate 5 is connected to the upper end of the longitudinal beam 2; the upper pin 7 is connected to the upper lap plate 5; a pair of upper connecting plates 8 are arranged on both sides of the upper lap plate 5 in a one-to-one correspondence; and the pair of upper connecting plates 8 are movably connected to the upper pin 7. Specifically, the upper pin 7 is welded to the upper lap plate 5, and then slidably connected to the pair of upper connecting plates 8 along the hinge axis. During the heating process of the boiler, the header 9 has thermal expansion in the front-to-back direction (i.e., the hinge axis). The traditional connection node is a weld, which is easily broken by the force of thermal expansion, causing the entire rigid beam structure system to fail, making it difficult to ensure the overall good stress performance and safety of the boiler. By setting the upper pin shaft 7 at the weld position of the traditional connection node, the force of the thermal expansion of the header 9 can be released on the upper pin shaft 7, that is, a first margin space is reserved between the upper lap plate 5 and the upper connecting plate 8 and between the free end face of the upper pin shaft 7 and the outer side face of the upper connecting plate 8. The force generated by the thermal expansion of the header 9 is converted into the displacement of the upper connecting plate 8 along the hinge axis on the upper pin shaft 7, thereby completing the release of the thermal expansion force of the header 9, ensuring the structural strength of the connection node, thereby ensuring the overall good force-bearing performance and safety of the boiler under long-term use.

[0043] Furthermore, a rectangular groove is provided on the upper connecting plate 8; the upper pin shaft 7 is a rectangular pin shaft; the rectangular pin shaft is movably connected to the rectangular groove; the rectangular pin shaft can move along the hinge axis in the rectangular groove, and the rectangular pin shaft can rotate around its own axis. Specifically, the size of the rectangular groove is larger than the size of the rectangular pin shaft, and the size of the rectangular groove is set according to actual needs. A second margin space is reserved between the inner wall of the rectangular groove and the outer wall of the rectangular pin shaft, and the second margin space is used to release the left and right directions ( Figure 1 The forces in the left and right directions are mainly due to the irregular deformation caused by the forces in the hinge axis and the forces in the vertical direction. At the same time, the rectangular groove is also used for guiding, limiting and supporting the rectangular pin shaft, and one groove has multiple uses.

[0044] Secondly, the upper lap plate 5 is clamped and welded to the top of the longitudinal beam 2. In this embodiment, a clamping groove is provided at the center of the top of the longitudinal beam 2, and the lower end of the upper lap plate 5 can be clamped to the clamping groove. The clamping groove plays a supporting and limiting role for the upper lap plate 5, which simplifies the welding process of the upper lap plate 5 and the longitudinal beam 2, and improves the connection strength of the two. At the construction site, the longitudinal beam 2 and the upper lap plate 5 have been welded in the factory, so the construction site only needs to connect the upper lap plate 5 and the connecting plate 8 through the upper pin shaft 7, and then weld the upper pin shaft 7 to the connecting plate 8, which greatly simplifies the construction process and improves the construction efficiency.

[0045] See also Figure 3, the lower lap assembly includes a lower lap plate 3 and a lower pin 6; the lower lap plate 3 is connected to the lower end of the longitudinal beam 2; the lower pin 6 is connected to a pair of lower connecting plates 4; the pair of lower lap plates 3 are arranged on both sides of the pair of lower connecting plates 4 in a one-to-one correspondence; the pair of lower lap plates 3 are hinged to the lower pin 6. In this embodiment, the lower pin 6 is a circular pin, and the lower lap plate 3 can rotate around the axis of the circular pin. The lower pin 6 plays a supporting and guiding role, which can enable the upper pin 7 to move smoothly in the second margin space of the rectangular groove, thereby realizing the efficient release of the thermal expansion force; at the same time, when the connecting plate 8 releases the thermal expansion force on the upper pin 7, the rigid beam module can rotate with the lower pin 6 as the rotation point, which improves the adaptability of the rigid beam module to the movement of the upper pin 7 in the rectangular groove, thereby improving the stability of the rigid beam structure system when releasing the thermal expansion force. Similarly, a third margin space is reserved between the lower lap plate 3 and the lower connecting plate 4 and between the free end face of the lower pin shaft 6 and the outer side face of the lower connecting plate 4. The third margin space is used to cooperate with the first margin space to release the axial force of the hinge, further improving the release threshold of the rigid beam structure system for the axial force of the hinge and the stability of the rigid beam structure system during the force release process.

[0046] In addition, the header 9 can drive the upper connecting plate 8 and the upper lap assembly to rise and fall in the vertical direction; the water-cooled wall 10 can drive the lower connecting plate 4 and the lower lap assembly to rise and fall in the vertical direction. In this embodiment, the rigid beam module is equivalent to the movable end, which can rise and fall in the vertical direction with the header water-cooled wall module, thereby further releasing the thermal expansion force of the header 9 and the water-cooled wall 10 in the vertical direction, further extending the service life of the connection node, effectively ensuring the structural strength of the rigid beam structure system under long-term use of the boiler, improving the reliability of the use of the rigid beam structure system, protecting the water-cooled wall structural components from being damaged under self-weight, deflagration, earthquake, positive (negative) pressure in the furnace, natural wind pressure and other loads, especially in the case of deflagration, and not causing permanent deformation and damage, thereby ensuring the overall good stress performance and safety of the boiler.

[0047] Furthermore, the cross beam 1 and the longitudinal beam 2 are I-beams. The I-beam has high structural strength and can effectively transmit the force of the water-cooled wall structural components. In this embodiment, the cross beam 1 is welded to the bottom end of the longitudinal beam 2; the lower lap plate 3 is welded to the outer side of the lower end of the longitudinal beam 2; the upper lap plate 5 is first clamped and then welded to the top center of the longitudinal beam 2; a hole is drilled on the upper lap plate 5 to form a rigid beam module. The bottom end of the header 9 and the top end of the water-cooled wall 10 are welded; the upper connecting plate 8 is welded to the header 9, and a hole is drilled on the upper connecting plate 8; the lower connecting plate 4 is welded to the water-cooled wall 10, and a hole is drilled on the lower connecting plate 4 to form a header water-cooled wall module. The upper pin 7 and the lower pin 6 are prefabricated, and the above steps are all completed in the factory. During on-site construction, the header water-cooled wall module is installed on the boiler, the drilled holes of the rigid beam module are connected with the drilled holes of the header water-cooled wall module, the upper pin shaft 7 and the lower pin shaft 6 are inserted accordingly, the upper lap plate 5 is welded to the upper pin shaft 7, and the lower connecting plate 4 is welded to the lower pin shaft 6, and the rigid beam structure system is completed.

[0048] It should be understood that the above description of the specific embodiments of the utility model is only for illustrating the technical route and features of the utility model, and its purpose is to enable those skilled in the art to understand the content of the utility model and implement it accordingly, but the utility model is not limited to the above specific implementation methods. All changes or modifications made within the scope of the claims of the utility model should be included in the protection scope of the utility model.

Claims

1. A rigid beam structure system for a boiler, characterized in that: The rigid beam structure system comprises a cross beam (1), a longitudinal beam (2), an upper lap joint assembly, a lower lap joint assembly, an upper connecting plate (8), a lower connecting plate (4), a header (9) and a water-cooled wall (10); The cross beam (1) and the lower lap assembly are both connected to the lower end of the longitudinal beam (2); the upper end of the longitudinal beam (2) is connected to the upper lap assembly; The upper connecting plate (8) is hinged to the upper lap assembly; and the upper connecting plate (8) is movable along the hinge axis; The lower connecting plate (4) is hinged to the lower lap assembly; and the lower connecting plate (4) is movable along the hinge axis; The header (9) is connected to the upper connecting plate (8); the water-cooled wall (10) is connected to the lower connecting plate (4); and the header (9) is connected to the water-cooled wall (10).

2. The rigid beam structure system of the boiler according to claim 1, characterized in that: The upper lap joint assembly comprises an upper lap joint plate (5) and an upper pin shaft (7); The upper lap plate (5) is connected to the upper end of the longitudinal beam (2); The upper pin shaft (7) is connected to the upper lap plate (5); a pair of upper connecting plates (8) are arranged on both sides of the upper lap plate (5) in a one-to-one correspondence; and a pair of upper connecting plates (8) are movably connected to the upper pin shaft (7).

3. The rigid beam structure system of the boiler according to claim 2, characterized in that: The upper connecting plate (8) is provided with a rectangular groove; the upper pin shaft (7) is a rectangular pin shaft; The rectangular pin is movably connected to the rectangular groove; the rectangular pin can move in the rectangular groove along the hinge axis, and the rectangular pin can rotate around its own axis.

4. The rigid beam structure system of the boiler according to claim 2, characterized in that: The upper lap plate (5) is clamped and welded to the top end of the longitudinal beam (2).

5. The rigid beam structure system of a boiler according to any one of claims 1 to 4, characterized in that: The lower lap joint assembly comprises a lower lap joint plate (3) and a lower pin shaft (6); The lower lap plate (3) is connected to the lower end of the longitudinal beam (2); The lower pin shaft (6) is connected to a pair of lower connecting plates (4); a pair of lower lap plates (3) are arranged on both sides of a pair of lower connecting plates (4) in a one-to-one correspondence; and a pair of lower lap plates (3) are hinged to the lower pin shaft (6).

6. The rigid beam structure system of a boiler according to any one of claims 1 to 4, characterized in that: The header (9) can drive the upper connecting plate (8) and the upper overlapping assembly to rise and fall in the vertical direction; The water-cooled wall (10) can drive the lower connecting plate (4) and the lower overlapping assembly to rise and fall in a vertical direction.

7. The rigid beam structure system of a boiler according to any one of claims 1 to 4, characterized in that: The cross beam (1) and the longitudinal beam (2) are I-beams.

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