Sliding column foot of waste heat boiler

Abstract

The invention relates to a sliding column foot of a waste heat boiler, and belongs to the technical field of boiler equipment. The high-strength concrete column comprises a column base, a bottom plate fixed to the bottom of the column base, a foundation plate arranged below the bottom plate, a first stainless steel plate fixedly connected with the bottom plate, and a second stainless steel plate fixedly connected with the foundation plate, a shear plate is arranged at the bottom of the foundation plate, and the bottom plate and the foundation plate are fixed through foundation bolts; and the first stainless steel plate is overlapped on the second stainless steel plate to form sliding connection. According to the invention, the first stainless steel plate and the second stainless steel plate are arranged between the bottom plate and the foundation plate to form sliding connection, and the friction force between the bottom plate and the foundation plate is small, so that the thermal stress borne by the column foot and the eccentric bending moment borne by the foundation are small when the waste heat boiler generates thermal expansion; the overall structural strength is ensured, and meanwhile the manufacturing cost of the column foot and the foundation can be reduced.

Description

Technical Field

[0001] The invention relates to a waste heat boiler column foot, in particular to a waste heat boiler sliding column foot, and belongs to the technical field of boiler equipment. Background Art

[0002] The column foot and foundation of the waste heat boiler traditionally adopt a fixed structure. In order to solve the overall thermal expansion displacement when the boiler is running, some waste heat boilers adopt a hinged structure. The disadvantage of the fixed structure is that the column foot generates a large thermal stress due to the resistance of thermal expansion, which easily causes damage to the steel structure column. At the same time, because the foundation has to withstand a large eccentric bending moment, the cross-sectional size of the foundation is large and the cost is high. Although the foundation can be relatively small with a hinged structure, the overall stability of the waste heat boiler is relatively poor.

[0003] A Chinese patent (CN217356850U) discloses a column foot structure of a waste heat boiler, which includes a column foot bottom plate, an anchor base plate arranged below the column foot bottom plate, a sliding plate arranged between the column foot bottom plate and the anchor base plate, and the column foot bottom plate, the sliding plate, and the anchor base plate are fixed by anchor bolts. In this scheme, the sliding plate adopts a polytetrafluoroethylene plate, and the column foot bottom plate and the anchor base plate slide relative to each other through the sliding plate. This sliding structure of the column foot and the foundation can adapt to the overall thermal expansion displacement when the boiler is running, effectively reduce the harm of thermal stress to the column foot, and can reduce the cost of the foundation compared to the fixed column foot, and has the advantage of better overall stability compared to the hinged column foot. However, this scheme still has the following defects in practice: The sliding friction coefficient between the sliding plate (PTFE plate) and the column foot bottom plate / anchor bolt base plate (steel plate) is 0.2, and the sliding friction is still large. In order to overcome the sliding friction resistance, the foundation still needs to have a larger cross-section to meet the strength requirements, so it is still not economical in terms of cost. In addition, PTFE has the risk of aging and failure in the natural environment, which affects the long-term use of the column foot. Summary of the invention

[0004] The present invention mainly solves the technical problems of high cost and short service life in the prior art, and provides a sliding column foot of a waste heat boiler with low cost and longer service life.

[0005] The present invention solves the above-mentioned technical problems mainly through the following technical solutions: the present invention includes a column foot, a base plate fixed to the bottom of the column foot, a foundation plate arranged below the base plate, a shear plate is arranged at the bottom of the foundation plate, the base plate and the foundation plate are fixed by anchor bolts, and is characterized in that it also includes a first stainless steel plate fixedly connected to the base plate and a second stainless steel plate fixedly connected to the foundation plate, and the first stainless steel plate is overlapped on the second stainless steel plate to form a sliding connection.

[0006] Preferably, the invention further comprises an oil filling hole penetrating through the bottom plate and the first stainless steel plate, and lubricating grease is poured between the first stainless steel plate and the second stainless steel plate.

[0007] Preferably, the oil filling hole has an internal thread matching the external thread of the oil cup interface.

[0008] Preferably, the bottom of the anchor bolt is bent into an L shape.

[0009] Preferably, the base plate and the first stainless steel plate have through holes through which the anchor bolts pass, and the diameter of the through holes is set according to the sliding amount of the column foot and with a 2-3 mm installation margin reserved.

[0010] The present invention has a simple structure and has the following advantages: In the present invention, the sliding plate is divided into two parts, the first stainless steel plate is fixed to the bottom plate, the second stainless steel plate is fixed to the base plate, and the bottom plate and the base plate are connected by sliding through the first stainless steel plate and the second stainless steel plate. Since the friction coefficient between the first stainless steel plate and the second stainless steel plate is small (the friction coefficient is ≤0.1), the friction between the bottom plate and the base plate is also small. When the waste heat boiler generates thermal expansion, the thermal stress on the column foot and the eccentric bending moment on the foundation are small, and the foundation can use a smaller cross-sectional size, so that the cost is reduced; at the same time, the stainless steel plate has good strength and material stability, which can effectively ensure the long-term use of the column foot.

[0011] Furthermore, lubricating grease is injected between the first stainless steel plate and the second stainless steel plate through the oil injection hole, which is simple and convenient to operate and can further reduce the friction between the first stainless steel plate and the second stainless steel plate.

[0012] Furthermore, the oil filling hole is provided with an internal thread for connecting an oil cup, and the oil cup is used to store lubricating grease, which helps to maintain good lubrication between the first stainless steel plate and the second stainless steel plate, extend the interval period of lubricating grease filling, and reduce the workload of filling.

[0013] Furthermore, the bottom of the anchor bolt is bent into an L shape, which helps to improve the anchoring effect of the anchor bolt buried in the foundation, which is simple and effective.

[0014] Furthermore, the diameter of the through hole is set according to the sliding amount of the column foot and a 2-3mm installation margin is reserved, so that the sliding displacement between the bottom plate and the base plate meets the requirements of the overall thermal expansion displacement of the waste heat boiler.

[0015] Therefore, the present invention improves the sliding friction structure between the column foot and the foundation, so that the force on the column foot and the foundation is improved when the waste heat boiler expands as a whole. Compared with the prior art, the present invention has the advantages of smaller foundation cross-section size and lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1is a schematic diagram of a preferred embodiment of the present invention; Attached Figure 2 Yes Figure 1 A schematic diagram of the present invention is shown in the top view direction.

[0017] Explanation of the reference numerals: 1. column base; 2. bottom plate; 3. foundation plate; 4. sliding plate; 41. first stainless steel plate; 42. second stainless steel plate; 5. shear plate; 6. anchor bolt; 7. oil filling hole; 8. through hole. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0019] Embodiment 1: As attached Figure 2 As shown, the present invention comprises a column foot 1, a bottom plate 2 fixed to the bottom of the column foot 1, a base plate 3 arranged below the bottom plate 2, and a sliding plate 4 arranged between the bottom plate 2 and the base plate 3; A shear plate 5 is provided at the bottom of the base plate 3; The base plate 2 and the foundation plate 3 are fixed to the foundation by anchor bolts 6; The sliding plate 4 includes a first stainless steel plate 41 welded and fixed to the bottom plate 2 and a second stainless steel plate 42 welded and fixed to the base plate 3. The first stainless steel plate 41 and the second stainless steel plate 42 are overlapped to form a sliding connection. Lubricating grease is poured between the first stainless steel plate 41 and the second stainless steel plate 42. The bottom of the anchor bolt 6 embedded in the foundation is bent into an L shape; The oil filling hole 7 passes through the bottom plate 2 and the first stainless steel plate 41, and the lubricating grease is poured between the first stainless steel plate 41 and the second stainless steel plate 42 through the oil filling hole 7; The oil filling hole 7 has an internal thread matching the external thread of the oil cup interface; The base plate 2 and the first stainless steel plate 41 have through holes 8 through which the anchor bolts 6 pass. The diameter of the through holes 8 is set according to the sliding amount of the column foot 1 and with a 2-3 mm installation margin.

[0020] When the present invention is used, an oil cup is installed at the oil filling hole 7 for storing lubricating grease, and the lubricating grease can be automatically injected between the first stainless steel plate 41 and the second stainless steel plate 42, which helps to maintain good lubrication between the first stainless steel plate 41 and the second stainless steel plate 42, prolong the interval period of lubricating grease filling, and reduce the workload of filling.

[0021] Of course, the above drawings and embodiments are only used to explain and illustrate the present invention, and cannot be used as improper limitations of the present invention. Any technical solutions obtained by those skilled in the art making equivalent adjustments and changes based on the present invention fall within the protection scope of the present invention.

Claims

1. A waste heat boiler sliding column foot, comprising a column foot (1), a bottom plate (2) fixed to the bottom of the column foot (1), a base plate (3) arranged below the bottom plate (2), a shear plate (5) being arranged at the bottom of the base plate (3), the bottom of the base plate (2) and the base plate (3) being fixed by anchor bolts (6), characterized in that: It also comprises a first stainless steel plate (41) fixedly connected to the bottom plate (2) and a second stainless steel plate (42) fixedly connected to the base plate (3), wherein the first stainless steel plate (41) is superimposed on the second stainless steel plate (42) to form a sliding connection.

2. The sliding column foot of a waste heat boiler according to claim 1, characterized in that: It also comprises an oil filling hole (7) penetrating the bottom plate (2) and the first stainless steel plate (41), and lubricating grease is poured between the first stainless steel plate (41) and the second stainless steel plate (42).

3. The sliding column foot of a waste heat boiler according to claim 2, characterized in that: The oil filling hole (7) has an internal thread matching the external thread of the oil cup interface.

4. A waste heat boiler sliding column foot according to claim 1, 2 or 3, characterized in that: The bottom of the anchor bolt (6) is bent into an L shape.

5. A waste heat boiler sliding column foot according to claim 1, 2 or 3, characterized in that: The base plate (2) and the first stainless steel plate (41) have through holes (8) through which the anchor bolts (6) pass, and the diameter of the through holes (8) is set according to the sliding amount of the column foot (1) and with a 2-3 mm installation margin reserved.

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