A connecting mechanism of a baffle driving rocker arm under high temperature, heavy load and vibration working conditions

Abstract

This utility model discloses a connection mechanism for a baffle-driven rocker arm under high-temperature, heavy-load vibration conditions. The rocker arm includes two spaced-apart thick plates, spaced axially along a drive shaft, each plate perpendicular to the drive shaft. The two plates are fixedly connected, and no force-transmitting sleeve is provided between them to transmit torque. The two plates and the drive shaft are synchronously rotatably connected via a polygonal shaft hole structure. The rocker arm also includes a reinforcing plate, which is fixedly connected between the two thick plates. The polygonal connection structure of the drive shaft and rocker arm in this utility model avoids the risk of weld cracking in traditional welded structures and the risk of failure of the connecting pin between the plate and the force-transmitting sleeve under high-temperature, heavy-load conditions. This structure is simple in structure, easy to process, and reliable in operation.

Description

Technical Field

[0001] This utility model relates to a baffle-driven rocker arm mechanism, and more particularly to a baffle drive under high temperature, heavy load and vibration conditions. Background Technology

[0002] In existing flue gas damper transmission mechanisms, the flue gas damper transmission device, the top of the damper, and the hanging device (fixed to the flue shell) are hinged. The lifting lug located in the middle of the damper is hinged to the connecting rod. The damper is driven by the connecting rod via a transmission shaft and rocker arm. The damper performs a 0~90° opening and closing action in the gas turbine exhaust flue, and the flow field inside the flue is in a high-speed turbulent state, with the flue gas temperature reaching 700℃.

[0003] Currently, the industry (both domestically and internationally) mostly uses direct welding to connect the drive shaft and rocker arm. This structure has risks: uncertain changes in material structure at high temperatures (above 650℃) can lead to localized failures; flue gas vibration can cause alternating stress on the drive shaft, leading to fatigue damage to the welded structure; and thermal stress caused by different thermal expansion rates between the materials of each component can damage weak points in the weld. Utility Model Content

[0004] In order to solve the problems existing in the background art, the purpose of this utility model is to provide a connection mechanism for a baffle-driven rocker arm under high temperature and heavy load vibration conditions.

[0005] Based on years of design research and process accumulation of this equipment, combined with actual operating experience, this utility model innovates the connection structure between the transmission shaft and the rocker arm into a polygonal transmission structure, eliminating the welding method and reducing the risk of failure of the welded structure under high temperature conditions.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: The connecting mechanism is used to connect the drive shaft and the rocker arm. The rocker arm includes two spaced thick plates. The two thick plates are spaced apart along the axial direction of the drive shaft. Each thick plate is arranged perpendicular to the drive shaft. The two thick plates are fixedly connected, and the two thick plates and the drive shaft are synchronously rotated and connected through a polygonal shaft hole structure.

[0007] The rocker arm also includes a reinforcing plate, and the two thick plates are fixedly connected by the reinforcing plate.

[0008] The two thick plates are welded together by a reinforcing plate.

[0009] The upper parts of the two thick plates are welded together by a reinforcing plate, and the lower parts of the two thick plates are welded together by another reinforcing plate.

[0010] It also includes a connecting rod, through which the rocker arm is connected to the baffle door.

[0011] The end of the rocker arm that is not connected to the drive shaft is hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to the baffle door.

[0012] Two thick plates have polygonal inner holes at one end, and the drive shaft is machined into a polygonal surface on its outer circumference. The polygonal surface of the drive shaft and the polygonal inner holes of the thick plates are connected in a fitting manner.

[0013] Preferably, the polygonal surface is configured as a hexagonal outer hexagonal structure, and the polygonal inner hole is configured as a hexagonal inner hexagonal structure.

[0014] The beneficial effects of this utility model are: This utility model solves the problem of cracking in the weld between the rocker arm and the transmission shaft ring, ensuring the safe operation of the equipment. It features a simple structure, easy processing, and reliable operation.

[0015] The connection structure between the central shaft and the rocker arm in this invention adopts a polygonal shape, avoiding the risk of weld cracking in traditional welded structures. The rocker arm design uses a structure of two thick plates on the left and right sides, with the driving torque directly borne by the thick plates. There is no force transmission sleeve between the two plates, avoiding the risk of failure of the connecting pin between the plates and the force transmission sleeve under high temperature and heavy load.

[0016] This utility model has undergone actual testing. After the transmission shaft structure and the baffle door are connected, the factory test was normal, and the equipment operates normally after on-site installation. The product has been verified in the factory laboratory, and the thermal expansion of each connecting component is normal, with no deformation or damage. Attached Figure Description

[0017] Figure 1 This is an overall structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the rocker arm of this utility model; Figure 3 This is a top view of the rocker arm of this utility model; Figure 4 This is a side view of the rocker arm of this utility model; Figure 5 This is a structural diagram of the transmission shaft of this utility model.

[0018] In the figure, there is a drive shaft (1), a rocker arm (2), a connecting rod (3), a baffle (4), a thick plate (21), a reinforcing plate (22), and a polygonal inner hole (23). Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] like Figure 1 As shown, the connecting mechanism is used to connect the drive shaft 1 and the rocker arm 2.

[0021] like Figure 2 As shown, the rocker arm 2 includes two spaced thick plates 21. The two thick plates 21 are spaced apart along the drive shaft 1. Each thick plate 21 is arranged perpendicular to the drive shaft 1. The two thick plates 21 are fixedly connected, and the two thick plates 21 and the drive shaft 1 are synchronously rotated and connected through a polygonal shaft hole structure.

[0022] like Figure 3 As shown, the rocker arm 2 also includes a reinforcing plate 22, and the two thick plates 21 are welded together by the reinforcing plate 22.

[0023] The specific implementation includes two reinforcing plates 22. The upper parts of the two thick plates 21 are welded together by one reinforcing plate 22, and the lower parts of the two thick plates 21 are welded together by another reinforcing plate 22. Each reinforcing plate 22 exactly covers the gap between the two parallel thick plates 21. One side of the reinforcing plate 22 is fixedly welded to one thick plate 21, and the other side of the reinforcing plate 22 is fixedly welded to the other thick plate 21.

[0024] like Figure 1 As shown, it also includes a connecting rod 3, and the rocker arm 2 is connected to the baffle gate 4 under high temperature and heavy load vibration conditions via the connecting rod 3. The end of the rocker arm 2 that is not connected to the drive shaft 1 is hinged to one end of the connecting rod 3, and the other end of the connecting rod 3 is hinged to the baffle gate 4.

[0025] In specific implementation, one end of the two thick plates 21 is provided with a polygonal inner hole 23, and the drive shaft 1 is machined into a polygonal surface 11 on its outer peripheral surface. The polygonal surface 11 of the drive shaft 1 and the polygonal inner hole 23 of the thick plate 21 are connected in a fitting manner.

[0026] In practice, the number of sides of the polygon connecting the plate and the shaft is determined by calculation. One implementation example is... Figure 4 and Figure 5 As shown, the polygonal surface 11 is configured as a hexagonal outer hexagonal structure, and the polygonal inner hole 23 is configured as a hexagonal inner hexagonal structure, so that the thick plate 21 and the drive shaft 1 are synchronously rotated and connected.

[0027] Furthermore, due to the presence of two thick plates 21, the drive shaft 1 is provided with a flange at the point where it connects to the rocker arm 2. Figure 5 As shown, the same axially continuous polygonal surface 11, or a polygonal surface 11 divided into two points at intervals.

[0028] There is no force transmission sleeve between the two thick plates 21, and the polygonal inner hole 23 of the thick plate 21 is assembled with the transmission shaft 1 with tolerance fit.

[0029] Existing transmission devices use a conventional industry solution, where the rocker arm and drive shaft are directly welded together. When the transmission device is exposed to temperatures exceeding 650°C, the welded structure is prone to failure and damage.

[0030] The transmission device of this utility model adopts a non-welded structure, and the joint surfaces of the transmission shaft and the rocker arm are designed as equilateral polygons, through which torque is transmitted.

[0031] Furthermore, in the actual implementation, the drive shaft and rocker arm are designed to be made of the same material with the same coefficient of thermal expansion.

[0032] The transmission between the polygonal inner hole of the rocker arm and the polygonal surface of the drive shaft adopts a small clearance fit; during assembly, a heat fitting process is used, that is, the entire rocker arm is heated to 200°C, laid flat, and then inserted into the drive shaft. This design and installation prevents the axial movement of the rocker arm, with one side being tightly pressed against the shaft shoulder and the other side being welded with a retaining ring, leaving a certain amount of axial expansion clearance.

[0033] The above specific embodiments are used to explain and illustrate the present utility model, and are not intended to limit the present utility model. Any modifications and changes made to the present utility model within the spirit and scope of the claims shall fall within the protection scope of the present utility model.

Claims

1. A connecting mechanism for a baffle-driven rocker arm under high-temperature, heavy-load vibration conditions, the connecting mechanism being used for the connection between a transmission shaft (1) and a rocker arm (2), characterized in that: The rocker arm (2) includes two spaced thick plates (21), which are spaced apart along the drive shaft (1). Each thick plate (21) is arranged perpendicular to the drive shaft (1). The two thick plates (21) are fixedly connected, and the two thick plates (21) and the drive shaft (1) are synchronously rotated and connected through a polygonal shaft hole structure.

2. The connecting mechanism for a baffle-driven rocker arm under high-temperature heavy-load vibration conditions according to claim 1, characterized in that: The rocker arm (2) also includes a reinforcing plate (22), and the two thick plates (21) are fixedly connected by the reinforcing plate (22).

3. The connecting mechanism for a baffle-driven rocker arm under high-temperature heavy-load vibration conditions according to claim 2, characterized in that: The two thick plates (21) are welded together by a reinforcing plate (22).

4. The connecting mechanism for a baffle-driven rocker arm under high-temperature heavy-load vibration conditions according to claim 2, characterized in that: The upper parts of the two thick plates (21) are welded together by a reinforcing plate (22), and the lower parts of the two thick plates (21) are welded together by another reinforcing plate (22).

5. The connecting mechanism for a baffle-driven rocker arm under high-temperature heavy-load vibration conditions according to claim 1, characterized in that: It also includes a connecting rod (3), and the rocker arm (2) is connected to the baffle door (4) via the connecting rod (3).

6. The connecting mechanism for a baffle-driven rocker arm under high-temperature heavy-load vibration conditions according to claim 5, characterized in that: The rocker arm (2) is not connected to the drive shaft (1) at one end and is hinged to one end of the connecting rod (3), while the other end of the connecting rod (3) is hinged to the baffle door (4).

7. The connecting mechanism for a baffle-driven rocker arm under high-temperature heavy-load vibration conditions according to claim 5, characterized in that: Two thick plates (21) have polygonal inner holes (23) at one end. The drive shaft (1) is machined into a polygonal surface (11) on its outer circumference. The polygonal surface (11) of the drive shaft (1) and the polygonal inner hole (23) of the thick plate (21) are connected in a fitting manner.

8. The connecting mechanism for a baffle-driven rocker arm under high-temperature heavy-load vibration conditions according to claim 5, characterized in that: The polygonal surface (11) is configured as a hexagonal outer hexagonal structure, and the polygonal inner hole (23) is configured as a hexagonal inner hexagonal structure.

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