A full-plate straight-hanging ladder of cooling tower
Patent Information
- Application Number
- CN202521945557.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-10
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-09-10
AI Technical Summary
摒弃传统焊接工艺，全部采用钣金折弯与螺栓/铆钉连接，制造周期缩短40%以上；整体重量较焊接爬梯减轻25%，运输和现场安装人力成本显著下降；无焊点消除潜在焊接缺陷，长期使用安全可靠；圆弧过渡与隐藏式连接大幅提升外观品质，满足现代工业审美；模块化设计使零部件通用互换，后期维护只需更换单件，全生命周期成本更低。
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Figure CN224800228U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of cooling tower technology, specifically a cooling tower all-sheet metal straight-hanging ladder. Background Technology
[0002] Existing cooling tower ladders are generally made of welded square or round tubing or sheet metal. Welded ladders are hot-dip galvanized after welding, a complex process with high labor intensity and specialized skills, resulting in high costs. Welding defects can compromise safety and shorten the ladder's lifespan. Traditional sheet metal ladders mostly use bolted or interlocking connections, making assembly difficult. The hanging section is at right angles, making it bulky, unsightly, and prone to scratching hands; they are also unstable when installed alone. Utility Model Content
[0003] To address the above issues, this utility model provides a cooling tower all-sheet metal straight-hanging ladder, which is made of galvanized steel, making it safe, reliable, lightweight, and weld-free. The steps and handrails are designed as C-shaped steel, the handrails have notched edges, and the cross connections are locked with hammer-core rivets, making assembly simple and ensuring that the steps can bear weight without worry.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A cooling tower all-sheet metal straight-hanging ladder includes a straight ladder assembly, a hanging ladder assembly, C-shaped steel sleeves, and support treads. The straight ladder assembly consists of two parallel straight ladder handrails and several steps evenly spaced between the handrails. The hanging ladder assembly consists of two parallel U-shaped hanging ladder rods, a hanging ladder handrail fixed between the two hanging ladder rods, and steps evenly spaced at the lower ends of the two hanging ladder rods. The C-shaped steel sleeves fit snugly against the adjacent ends of the straight ladder handrails and hanging ladder rods, and are bolted together on three sides to achieve a rigid connection between the straight ladder assembly and the hanging ladder assembly. The support treads are fixed to the lower end of the straight ladder assembly by bolts or rivets to bear vertical loads. The straight ladder handrails, hanging ladder handrails, hanging ladder rods, and steps are all C-shaped steel structures formed by bending sheet metal. The hanging ladder handrails are integral U-shaped sheet metal bending parts with rounded transitions between their side plates and the bottom plate. The support treads are integral U-shaped sheet metal bending parts with rounded transitions between their side plates and the bottom plate.
[0005] The beneficial effects of the above technical solution are as follows: the whole structure adopts a full sheet metal C-shaped steel structure, which is weld-free, lightweight, high-strength, and simple to manufacture; the C-shaped steel straight sleeve three-sided locking structure makes the straight ladder and hanging ladder form a rigid whole, which is quick to install and reliable in load bearing; the rounded transition avoids sharp corners, improves safety, and prevents scratches; the supporting treads distribute the load and extend the service life.
[0006] As a further improvement to the above solution, the corner of the hanging ladder handrail is rounded and a notch is provided at the corner, through which a plug-in connection is formed with the end of the hanging ladder rod.
[0007] The beneficial effects of the above technical solution are: the plug-in connection provides precise positioning and high assembly efficiency; the rounded transition eliminates stress concentration and improves structural strength; the notch design allows the ladder rod to be hidden inside the handrail, resulting in a simple appearance and reducing exposed sharp edges.
[0008] As a further improvement to the above solution, the handrail of the hanging ladder includes a U-shaped handrail base plate. The outer edges of both sides of the base plate are bent upward to form the longitudinal edge of the handrail, and the outer edge of the middle part of the base plate is bent upward to form the horizontal edge of the handrail. The side edges of the horizontal edge and the longitudinal edge of the handrail are bent to form a bent edge. A notch is opened on the bent edge for the insertion and connection of the end of the hanging ladder rod.
[0009] The beneficial effects of the above technical solution are as follows: multiple bends form a closed cavity, which significantly improves torsional stiffness; the bent edge serves as both a reinforcing rib and a connecting interface, achieving dual functionality and reducing the number of parts; the notch and the bent edge work together to achieve self-positioning, eliminating the need for additional tooling during assembly.
[0010] As a further improvement to the above solution, the included angle of the supporting pedal is rounded.
[0011] The beneficial effects of the above technical solution are: the rounded transition eliminates stress concentration at sharp corners, improving the fatigue life of the pedal; the rounded edges prevent operators from being bumped and injured, improving safety and comfort during use.
[0012] As a further improvement to the above solution, the supporting pedal includes a U-shaped pedal base plate, with the outer edges on both sides of the base plate bent upward to form the longitudinal edge of the pedal, and the outer edge in the middle of the base plate bent upward to form the transverse edge of the pedal. The transverse edge of the pedal and the side edges of the longitudinal edge of the pedal are bent to form a bent edge.
[0013] The beneficial effects of the above technical solution are as follows: the four-sided bending forms a box-shaped structure, which greatly improves the bending load-bearing capacity of the pedal; the bent edges form continuous reinforcing ribs, which enhance the overall rigidity; the one-piece molding reduces welds, reduces the risk of corrosion, and extends the maintenance cycle.
[0014] As a further improvement to the above solution, grooves are opened on the inner side of both the straight ladder handrail and the hanging ladder handrail, and the ends of the steps are inserted into the grooves and fixed by core rivets.
[0015] The beneficial effects of the above technical solution are as follows: the slot positioning ensures that the steps are level and the climbing is stable; the core rivet can be fastened by one-sided operation, without the need for on-site welding, and the installation efficiency is high; the concealed connection makes the appearance neat and reduces the risk of snagging caused by exposed fasteners.
[0016] The overall beneficial effects of this utility model compared with the prior art are as follows: Abandoning traditional welding processes, all connections are made using sheet metal bending and bolts / rivets, reducing the manufacturing cycle by more than 40%; the overall weight is 25% lighter than welded ladders, significantly reducing transportation and on-site installation labor costs; the absence of weld points eliminates potential welding defects, ensuring long-term safety and reliability; the rounded transitions and concealed connections greatly enhance the appearance quality, meeting modern industrial aesthetics; the modular design makes parts interchangeable, and later maintenance only requires replacing a single part, resulting in lower total life cycle costs. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0018] Figure 2 This is a structural diagram of the ladder assembly.
[0019] Figure 3 This is a schematic diagram of the installation structure of the steps and handrails.
[0020] Figure 4 This is a structural diagram of a C-shaped steel straight-sleeve connection between a straight ladder assembly and a hanging ladder assembly.
[0021] Figure 5 This is a schematic diagram of the handrail structure of a hanging ladder.
[0022] Figure 6 A schematic diagram of the supporting pedal structure.
[0023] Figure 7 A top view of the structure supporting the pedals.
[0024] In the diagram: 1. Straight ladder assembly; 2. Hanging ladder assembly; 3. Supporting tread; 4. C-shaped steel sleeve; 11. Straight ladder handrail; 12. Step; 13. Groove; 21. Hanging ladder rod; 22. Hanging ladder handrail; 31. Tread longitudinal edge; 32. Tread base plate; 33. Tread transverse edge; 221. Handrail base plate; 222. Handrail longitudinal edge; 223. Handrail transverse edge; 224. Notch. Detailed Implementation
[0025] To enable those skilled in the art to better understand the technical solution, the present invention will be described in detail below with reference to the embodiments. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.
[0026] I. Overall Composition and Functional Overview like Figures 1-7 As shown, the cooling tower's all-sheet metal hanging ladder in this embodiment mainly consists of four functional modules: 1. Straight elevator component 1 – for maintenance personnel to access the cooling tower daily; 2. Ladder assembly 2 – used to hang the entire ladder against the outer wall of the cooling tower and to make the straight ladder assembly 1 reliably connected to the tower body; 3. Support step 3 - installed at the lower end of the straight ladder assembly 1, serving as both a horizontal support at the bottom and the first step for people to climb the ladder; 4. C-shaped steel straight sleeve 4 – realizes the rigid connection between the straight ladder assembly 1 and the hanging ladder assembly 2, and bears the transmission of the vertical load, lateral wind load and personnel impact load of the whole ladder.
[0027] All four modules are manufactured using sheet metal bending forming technology, and the material is hot-dip galvanized steel sheet (grade DX51D+Z, thickness 2.0mm~3.0mm). Assembly can be completed without any welding, thus completely avoiding the safety hazards caused by weld defects in traditional welded ladders.
[0028] II. Detailed Structure and Function of Each Component 1. Straight ladder component 1 1.1 Elevator handrail 11 The straight ladder handrail 11 consists of two parallel C-shaped bends in the vertical direction, with a "C" shaped cross-section and an inward-facing opening.
[0029] 1.2 Steps 12 Step 12 is also a C-shaped bent component, with its end inserted into a rectangular slot 13 on the inner side of the straight ladder handrail 11 and fixed with Φ4mm stainless steel hammer rivets. Each slot 13 is evenly distributed along the height of the handrail, with a spacing of H = 300mm ± 2mm to ensure comfortable stepping. The upper surface of step 12 is pressed with raised ribs for anti-slip purposes; the lower surface is welded (spot welded) with two symmetrical reinforcing plates to prevent local deformation.
[0030] 2. Ladder assembly 2 2.1 U-shaped ladder rod 21 The ladder rod 21 is U-shaped and is used to hook onto the embedded angle steel or C-shaped steel beam on the outer wall of the cooling tower. The U-shaped cross-section has the same dimensions as the C-shaped cross-section of the straight ladder handrail 11, ensuring that the C-shaped steel sleeve 4 can simultaneously cover both to achieve a transition connection.
[0031] 2.2 Ladder handrail 22 The handrail 22 is a one-piece U-shaped bent component, including a U-shaped handrail base plate 221. The outer edges of both sides of the handrail base plate 221 are bent upwards to form the longitudinal edges 222 of the handrail, and the outer edge of the middle part of the handrail base plate 221 is bent upwards to form the transverse edges 223 of the handrail, thus forming a double-layer reinforced structure. A notch 224 is provided at the intersection of the transverse edge 223 and the longitudinal edge 222 of the handrail. The width of the notch 224 matches the thickness of the end of the ladder rod 21, forming a plug-in connection. During assembly, the end of the ladder rod 21 is directly inserted into the notch 224 and then tightened with M6×20 countersunk bolts to achieve a rigid connection between the ladder rod 21 and the handrail 22. The longitudinal edge 222 and the transverse edge 223 of the handrail are connected by the handrail base plate 221, and the handrail base plate 221 at the connection point has an R8mm rounded transition.
[0032] 3. Support pedal 3 The supporting tread 3 is also a one-piece U-shaped sheet metal bending component, with the longitudinal edges of the tread formed by bending upwards from both sides of the tread base plate; and the transverse edges of the tread formed by bending upwards from the outer side of the middle of the tread base plate. Φ6.5mm oval holes are provided on the longitudinal edge 31 and the transverse edge 33 of the tread for connecting to the lower end of the straight ladder assembly 1 using M6×16 bolts or Φ5×12 aluminum rivets. The overall length of the supporting tread 3 is L=600mm, and the width is W=250mm, which can completely cover the bottom of the straight ladder, distributing the vertical load and preventing localized settlement.
[0033] 4. C-shaped steel straight sleeve 4 The C-shaped steel sleeve 4 is a C-shaped covering formed by bending a rectangular steel plate three times at 90°. Its inner cavity dimensions are matched with the outer contour of the straight ladder handrail 11 and the hanging ladder rod 21 (single-sided clearance ≤ 0.5mm) to ensure no shaking after assembly. Three sets of Φ9mm through holes are respectively opened on the three wall panels of the C-shaped steel sleeve 4, and three-sided locking is achieved by M8×25 countersunk bolts. Figure 4 This connection method clamps the end face, side face, and back face of the straight ladder assembly 1 and the hanging ladder assembly 2 simultaneously to form a rigid node, which increases the torsional stiffness by about 3 times compared with the traditional single-sided bolt connection.
[0034] Summary of technical effects and beneficial effects 1. Through full sheet metal design, welding defects and secondary hot-dip galvanizing processes are avoided, shortening the production cycle by 30% and reducing costs by 18%.
[0035] 2. The three-sided locking structure of the C-shaped steel straight sleeve 4 significantly improves the node stiffness, and the first natural frequency of the whole ladder is ≥35Hz, which is much higher than the industry standard of 25Hz, effectively suppressing wind load resonance.
[0036] 3. The rounded transition at the angle between the handrail 22 and the supporting tread 3 is not only aesthetically pleasing, but also more robust.
[0037] 4. The dual connection method of plug-in and rivet / bolt makes on-site installation unnecessary for welding and hot work, and can be completed by two workers in 30 minutes, which greatly reduces the difficulty of installation and safety risks.
[0038] It should be noted that, in this document, the terms "comprising," "including," and any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of the present invention. These examples are merely for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be pointed out that, due to the limitations of written expression and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or variations without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the concept and technical solution of the present invention to other situations without modification, should all be considered within the scope of protection of the present invention.
Claims
1. A fully sheet metal straight-hanging ladder for cooling towers, characterized in that, include A straight ladder assembly (1) includes two parallel straight ladder handrails (11) and a number of steps (12) evenly spaced between the two straight ladder handrails (11) along the height direction. The ladder assembly (2) includes two parallel U-shaped ladder rods (21), a ladder handrail (22) fixed between the two ladder rods (21), and steps (12) evenly spaced at the lower ends of the two ladder rods (21). C-shaped steel sleeve (4), the C-shaped steel sleeve (4) fits and fits the adjacent ends of the straight ladder handrail (11) and the hanging ladder rod (21) together. The C-shaped steel sleeve (4) locks the straight ladder handrail (11) and the hanging ladder rod (21) on three sides by bolts, so as to realize the rigid connection between the straight ladder assembly (1) and the hanging ladder assembly (2). Supporting pedal (3), which is fixed to the lower end of the straight ladder assembly (1) by bolts or rivets, is used to bear the vertical load of the straight ladder assembly (1); in, The straight ladder handrail (11), the hanging ladder handrail (22), the hanging ladder rod (21) and the steps (12) are all C-shaped steel structures formed by bending sheet metal; The handrail (22) of the hanging ladder is a U-shaped sheet metal bending part with rounded transitions between its side plates and the bottom plate; The supporting pedal (3) is an integral U-shaped sheet metal bending part, with its two side plates and the bottom plate transitioning in a rounded arc.
2. The all-sheet metal straight-hanging ladder for cooling towers according to claim 1, characterized in that, The corner of the handrail (22) of the hanging ladder is rounded; a notch (224) is provided at the corner, and a plug-in connection is formed with the end of the hanging ladder rod (21) through the notch (224).
3. A cooling tower all-sheet metal straight-hanging ladder according to claim 2, characterized in that, The handrail (22) of the hanging ladder includes a U-shaped handrail base plate (221), the outer edges of the two sides of the handrail base plate (221) are bent upward to form the longitudinal edge (222) of the handrail, and the outer edge of the middle part of the handrail base plate (221) is bent upward to form the horizontal edge (223) of the handrail; the side edges of the horizontal edge (223) and the longitudinal edge (222) of the handrail are bent to form a bent edge; a notch (224) is opened on the bent edge for the end of the hanging ladder rod (21) to be inserted and connected.
4. A cooling tower all-sheet metal straight-hanging ladder according to claim 1, characterized in that, The included angle of the support pedal (3) is a rounded transition.
5. A cooling tower all-sheet metal straight-hanging ladder according to claim 4, characterized in that, The supporting pedal (3) includes a U-shaped pedal base plate (32); the outer edges of both sides of the pedal base plate (32) are bent upward to form the longitudinal edge (31) of the pedal, and the outer edge of the middle part of the pedal base plate (32) is bent upward to form the transverse edge (33) of the pedal; the transverse edge (33) of the pedal and the side of the longitudinal edge (31) of the pedal are bent to form a bent edge.
6. A cooling tower all-sheet metal straight-hanging ladder according to claim 1, characterized in that, The inner side of the straight ladder handrail (11) and the inner side of the hanging ladder handrail (22) are both provided with slots (13), and the end of the step (12) is inserted into the slot (13) and fixed by a core rivet.