Vibration reduction maintenance platform rooted on deaerator platform

Abstract

The utility model discloses a damping maintenance platform rooted on a deaerator platform, which mainly comprises a maintenance platform body and platform pillars, and four corners of the maintenance platform body are erected on the corresponding platform pillars through rubber damping blocks arranged at the upper ends of the platform pillars. The vibration reduction overhaul platform belongs to a fixed overhaul platform, and the platform is not in direct contact with a vibration source while the safety and stability of the overhaul platform are ensured, so that the purpose of vibration reduction is achieved. In a word, the device has the characteristics of reasonable design, simple structure, good effect and the like. According to the utility model, the on-line repair of equipment is not delayed, and the influence of vibration of the deaerator and the connected pipeline on the quality of the on-line maintenance valve is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of energy technology, and in particular relates to a vibration reduction and maintenance platform rooted in a deaerator platform. Background Technology

[0002] The deaerator is one of the main pieces of equipment in a thermal power plant. Numerous problems arise during its operation, such as steam-water oscillation, spontaneous boiling, and vibration of connecting pipes, all of which cause varying degrees of vibration within the deaerator itself. Due to the deaerator's large size, a deaerator platform is installed for ease of maintenance and repair. This platform is usually provided with the equipment and is embedded in the main body. Vibration of the deaerator causes the platform to vibrate accordingly. The deaerator has multiple steam and water interfaces. To reduce the impact of pipe vibration caused by the two-phase flow on the deaerator, many regulating valves, such as the minimum flow valve for feedwater, are located on the deaerator platform. Although these valves undergo periodic shutdowns for maintenance, the harsh internal and external operating environment often leads to problems such as valve malfunction, inability to close to the zero position, lack of feedback signals from pneumatic actuators, unstable signal pressure, and positioner failures, requiring online troubleshooting. The valve actuator is typically located approximately 2.1m to 2.3m from the deaerator platform. When troubleshooting the actuator online, it's impossible to operate directly from the deaerator platform. Setting up a temporary platform on the deaerator platform would not only delay repairs but also cause significant swaying for workers standing on it due to vibrations from the deaerator and related pipelines, severely impacting the quality of troubleshooting and repair. Some workers, in an effort to avoid delays, even operate while standing on the pipelines, posing a safety hazard. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a vibration reduction and maintenance platform that is reasonably designed, simple in structure, and effective, and is rooted in the deaerator platform.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] The vibration damping maintenance platform, which is rooted in the deaerator platform, mainly consists of the maintenance platform body and the platform support. The four corners of the maintenance platform body are supported on the corresponding platform support by rubber vibration damping blocks placed on the upper end of the platform support.

[0006] The top and bottom of the rubber damping block are respectively bonded to the lower surface of the four corners of the maintenance platform body and the upper end of the platform support.

[0007] The top plate and bottom plate of the platform support are welded and fixed to the upper and lower ends, respectively.

[0008] The rubber damping blocks are bonded to the top plate of the support column, and the rubber damping blocks are diagonally limited by the outer and inner limiting angle steels welded to the top plate of the support column.

[0009] The gap between the rubber damping block and the outer and inner limiting angle steels is 5mm.

[0010] The outer limiting angle steel is higher than the main body of the maintenance platform, while the inner limiting angle steel is lower than the main body of the maintenance platform.

[0011] The outer limiting angle steel is 10mm higher than the main body of the maintenance platform, and the inner limiting angle steel is 20mm lower than the main body of the maintenance platform.

[0012] An anti-detachment steel plate is welded above the outer limiting angle steel.

[0013] The anti-detachment steel plate is larger than the outer limiting angle steel, and the outer edges of the four corners of the maintenance platform body do not exceed the outer corners of the rubber damping blocks.

[0014] The maintenance platform is surrounded by guardrails.

[0015] To address the current problems in deaerator maintenance, the inventors designed a vibration-damping maintenance platform rooted in the deaerator platform. The platform mainly consists of a platform body and platform supports. The four corners of the platform body are supported on the corresponding platform supports via rubber vibration damping blocks placed on the upper ends of the supports. This vibration-damping maintenance platform is a fixed type, ensuring the platform's safety and stability while preventing direct contact between the platform and the vibration source, thus achieving vibration reduction. When setting up the maintenance platform, the gap between the pipeline and the platform is initially determined by calculating the pipeline's thermal displacement. By analyzing the pipeline's vibration characteristics, the gap between the platform and the pipeline is further increased, with the increased gap set to the acceptable value for steady-state vibration assessment. A vibration damping groove is installed between the maintenance platform and the supports, and the damping blocks are fixed within the groove. This ensures the stability of the maintenance platform while preventing direct contact between the platform and the vibration source, thus achieving vibration reduction. Applying this invention allows for uninterrupted online equipment repair and reduces the impact of deaerator and connected pipeline vibration on the quality of online maintenance valves.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) When in use, since the maintenance platform does not directly contact the vibration source, the impact of deaerator vibration on instrument online troubleshooting is greatly reduced.

[0018] (2) The size and height of the platform are determined according to the needs of on-site maintenance, which improves the practicality of the maintenance platform.

[0019] (3) Using a fixed platform allows time for online troubleshooting and elimination of equipment and instruments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the usage status and overall structure of the vibration reduction and maintenance platform based on the deaerator platform of this utility model. In the figure: (a) front view, (b) A-axis view.

[0021] Figure 2 yes Figure 1 A schematic diagram of the arrangement of the limiting angle steel in the vibration reduction maintenance platform of this utility model. In the figure: (a) front view, (b) view from direction B.

[0022] Figure 3 yes Figure 1 This utility model provides a schematic diagram of the anti-detachment steel plate structure in the vibration reduction maintenance platform. In the diagram: (a) front view, (b) C-direction view.

[0023] Figure 4 yes Figure 1 A schematic diagram of the platform layout of this utility model's vibration reduction and maintenance platform.

[0024] In the diagram: 1. Maintenance platform body, 2. Anti-detachment steel plate, 3. Rubber damping block, 4. Outer limiting angle steel, 5. Support top plate, 6. Platform support, 7. Support bottom plate, 8. Deaerator platform, 9. Inner limiting angle steel, 10. Guardrail, 11. Pipeline. Detailed Implementation

[0025] I. Basic Structure

[0026] like Figures 1 to 4 As shown, the vibration-damping maintenance platform of this utility model, rooted in the deaerator platform, mainly includes a maintenance platform body 1 and platform supports 6. To ensure stable stress distribution, the four corners of the maintenance platform body are supported on the corresponding platform supports by rubber vibration damping blocks 3 placed on the upper ends of the platform supports.

[0027] The top and bottom plates of the platform supports are welded and fixed to the upper and lower ends, respectively. The top and bottom of the rubber damping blocks are bonded to the lower surfaces of the four corners of the maintenance platform body and the top plates of the platform supports, respectively. The rubber damping blocks are diagonally limited by outer and inner limiting angle steels 5 and 9, respectively, welded and fixed to the top plates. The gap between the rubber damping blocks and the outer and inner limiting angle steels is 5mm. The outer limiting angle steel is higher than the maintenance platform body, and the inner limiting angle steel is lower than the maintenance platform body. An anti-detachment steel plate 2 is welded above the outer limiting angle steel. The anti-detachment steel plate is larger than the outer limiting angle steel, and the outer edges of the four corners of the maintenance platform body do not exceed the outer corners of the rubber damping blocks. Guardrails 10 are installed around the perimeter of the maintenance platform body.

[0028] II. Installation and Use

[0029] First, determine the positions of the platform supports where the maintenance platform needs to be installed, and ensure that the positioning of the supports does not interfere with the thermal expansion of the pipeline 11. At the same time, reserve a certain amplitude space for the pipeline to avoid collision between the pipeline and the platform during normal expansion or vibration. The thermal expansion of the pipeline is determined according to the positive thermal displacement value in the pipeline stress calculation results. The amplitude space of the pipeline is determined according to the medium in the pipeline and the on-site layout. Since there are many steam-water pipelines connected to the deaerator, the valves on the general steam-water pipelines that require maintenance are determined according to the qualified values and vibration frequencies in the steady-state vibration assessment in the "Technical Guide for Vibration Testing and Evaluation of Steam-Water Pipelines in Thermal Power Plants" (DL / T 292).

[0030] In this example, the valve for platform maintenance is a water pipeline valve. The medium flow velocity of such pipelines is small and the excitation frequency is low. According to the "Technical Guide for Vibration Testing and Evaluation of Steam-Water Pipelines in Thermal Power Plants" (DL / T 292), when the steady-state vibration assessment is qualified, the measured peak velocity of pipeline vibration is 32.4 mm / s. Calculated at a frequency of 3.5 Hz, the amplitude is about 1.5 mm. After stress calculation, the horizontal radial thermal displacement of the pipeline is +10 mm and the vertical thermal displacement is 6 mm. Therefore, the gap δ1 between the outer wall of the pipeline and the platform support 6 should be not less than 11.5 mm, and the gap δ2 between the outer wall of the pipeline and the maintenance platform 1 should be not less than 7.5 mm.

[0031] Since the deaerator platform 8 usually uses grating plates, to ensure the stability of the maintenance platform, the platform support and the deaerator platform are welded through a steel plate (i.e., the support bottom plate) (bolt connection is also acceptable without affecting the stability). The height of the support is determined according to the requirements, while ensuring that the erection of the supported platform does not interfere with the thermal expansion of the pipeline and reserving a certain amplitude space for the pipeline. The top of the support is leveled and fixed by welding with a steel plate (i.e., the support top plate). Rubber vibration damping blocks are arranged between the platform and the support top plate and fixed with adhesive. To prevent the rubber vibration damping blocks from loosening and causing the platform to be unstable, the rubber vibration damping blocks are limited by angle steels (i.e., the outer limiting angle steel and the inner limiting angle steel) diagonally. The maintenance platform body is erected on the rubber vibration damping blocks. The anti-disconnection steel plate welded to the top of the outer limiting angle steel is slightly larger than the size of the angle steel to clamp the maintenance platform and prevent the maintenance platform from shifting due to the vibration of the deaerator or the connected pipelines. A 5-mm gap is maintained between the limiting angle steel and the rubber vibration damping block to reduce the influence of the vibration source on the maintenance platform. The outer limiting angle steel is 10 mm higher than the maintenance platform body to reduce the influence of equipment vibration, and the inner limiting angle steel is 20 mm lower than the maintenance platform body to facilitate the layout of the maintenance platform. Since the maintenance platform is erected on the deaerator platform and the height of the deaerator platform guardrail cannot meet the protection requirements, a guardrail is set on the maintenance platform.

Claims

1. A damping access platform rooted on a deaerator platform, characterized in that The maintenance platform body is erected on the corresponding platform support through rubber shock-absorbing blocks arranged on the upper end of the platform support.

2. The damping access platform of claim 1, wherein: The top end and the bottom end of the rubber shock-absorbing block are respectively bonded to the lower surface of the four corners of the maintenance platform body and the upper end of the platform support.

3. The damping access platform of claim 2, wherein: The upper end and the lower end of the platform support are respectively welded with a support top plate and a support bottom plate.

4. The damping access platform of claim 1, wherein: The rubber shock-absorbing block is bonded to the support top plate, and the rubber shock-absorbing blocks at opposite corners are respectively limited by the outer limiting angle steel and the inner limiting angle steel welded on the support top plate.

5. The damping access platform of claim 4, wherein: The gap between the rubber shock-absorbing block and the outer limiting angle steel and the inner limiting angle steel is 5mm.

6. The damping access platform of claim 4, wherein: The outer limiting angle steel is higher than the maintenance platform body, and the inner limiting angle steel is lower than the maintenance platform body.

7. The damping access platform of claim 5, wherein: The outer limiting angle steel is 10mm higher than the maintenance platform body, and the inner limiting angle steel is 20mm lower than the maintenance platform body.

8. The damping access platform of claim 4, wherein: The outer limiting angle steel is welded with an anti-falling steel plate above.

9. The damping access platform of claim 8, wherein: The anti-falling steel plate is larger than the outer limiting angle steel, and the outer edge of the four corners of the maintenance platform body does not exceed the outer corner side of the rubber shock-absorbing block.

10. The damping access platform of claim 1, wherein: The maintenance platform body is provided with a guardrail around.

Images