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CN-121977023-A - Anti-falling device for fan switch type baffle of thermal power plant and control method

CN121977023ACN 121977023 ACN121977023 ACN 121977023ACN-121977023-A

Abstract

A thermal power plant fan switch type baffle anti-drop device and a control method belong to the technical field of fan accessories of thermal power plants, and the thermal power plant fan switch type baffle anti-drop device comprises a reduction gearbox body, wherein the output end of the reduction gearbox body is connected with a baffle through an elastic coupling, a reduction gearbox connecting block is connected to the output end of the reduction gearbox body, a driving shaft for connecting the baffle is penetrated in the reduction gearbox connecting block II, a first limiting block and a second limiting block are sequentially sleeved on the driving shaft between the baffle and the reduction gearbox connecting block II, a first limiting protrusion is arranged on the first limiting block, a second limiting protrusion is arranged on the second limiting block, and the first limiting protrusion is abutted with the second limiting protrusion so as to prevent sliding of one side of the two-way baffle of the reduction gearbox connecting block. By introducing the axial limiting structure into the transmission chain, accidental sliding of the connecting block of the reduction gearbox relative to the direction of the driving axial baffle plate can be effectively prevented, and free left sliding of the connecting block II of the reduction gearbox can be realized after the two limiting protrusions are staggered, so that the coordination adjustment of the specific opening state of the reduction gearbox is realized.

Inventors

  • YAN LEI
  • CUI GANG
  • FENG HONGLIANG
  • LI XIAN
  • SHI XUEGANG
  • LI YONG

Assignees

  • 国家能源泰安热电有限公司

Dates

Publication Date
20260505
Application Date
20251224

Claims (10)

  1. 1. The utility model provides a fan switch formula baffle anticreep device of thermal power plant, includes reducing gear box body (1), the output of reducing gear box body (1) has baffle (2) through elastic coupling, elastic coupling is including reducing gear box even piece one (101) and reducing gear box even piece two (301) that can mutually support, and reducing gear box even piece one (101) is connected at the output of reducing gear box body (1), runs through in reducing gear box even piece two (301) have drive shaft (3) of connecting baffle (2), a serial communication port, cover in proper order on drive shaft (3) between baffle (2) and reducing gear box even piece two (301) is equipped with stopper one (5) and stopper two (6), one end that stopper one (5) is close to stopper two (6) is equipped with spacing protruding one (501), be equipped with on stopper two (6) can with spacing protruding two (601) of spacing protruding one (501) matched with, spacing protruding two (601) butt in order to realize preventing that the reducing gear box from linking piece two (301) to sliding to baffle (2) one side.
  2. 2. The anti-disengaging device for the switch-type baffle of the fan of the thermal power plant according to claim 1, wherein at least two first limit protrusions (501) are uniformly distributed on the first limit block (5), a first limit groove (502) is arranged between every two adjacent first limit protrusions (501), and the first limit groove (502) can accommodate the second limit protrusions (601).
  3. 3. The anti-disengaging device for the switch-type baffle of the fan of the thermal power plant according to claim 2, wherein the number of the second limiting protrusions (601) is the same as that of the first limiting protrusions (501), and a second limiting groove (602) capable of accommodating the first limiting protrusions (501) is arranged between the two adjacent limiting protrusions (601).
  4. 4. The anti-disengaging device for the switch-type baffle of the fan of the thermal power plant according to claim 1, wherein one side, far away from the second limiting block (6), of the first limiting block (5) is connected with a fixed ring (4), and the fixed ring (4) is fixedly arranged on the driving shaft (3).
  5. 5. The anti-disengaging device for the fan switch type baffle of the thermal power plant according to claim 4, wherein the contact surface of the first limiting protrusion (501) and the second limiting protrusion (601) is obliquely arranged, and the contact surface of the first limiting protrusion (501) faces the driving shaft (3) to the inclined direction of one side of the reduction gearbox body (1) axially and is consistent with the rotation direction of the output end of the reduction gearbox body (1).
  6. 6. The anti-disengaging device for the switch-type baffle of the fan of the thermal power plant according to claim 4, wherein the contact surface of the first limiting protrusion (501) and the second limiting protrusion (601) is meshed by insections.
  7. 7. The anti-disengaging device for the fan switch type baffle of the thermal power plant according to claim 4 is characterized in that the fixing ring (4) comprises a first fixing plate (401) and a second fixing plate (402) which are arc-shaped, a first locking plate (403) capable of being attached to the outer wall of the driving shaft (3) is arranged at two ends of the first fixing plate (401), a threaded hole (405) is formed in the first locking plate (403), a second locking plate (404) capable of being covered on the outer portion of the first locking plate (403) is arranged at two ends of the second fixing plate (402), a through hole (406) capable of being overlapped with the axis of the threaded hole (405) is formed in the second locking plate (404), and locking bolts capable of pressing the fixing ring (4) on the driving shaft (3) are arranged in the threaded hole (405) and the through hole (406).
  8. 8. The anti-disengaging device for the fan switch type baffle of the thermal power plant according to claim 4, wherein a compression spring (7) is arranged between the second limiting block (6) and the second connecting block (301) of the reduction gearbox, and the compression spring (7) is sleeved on the driving shaft (3).
  9. 9. The anti-disengaging device for the fan switch type baffle of the thermal power plant according to claim 4, wherein a plurality of key grooves I (302) are formed in the driving shaft (3), key bodies (303) capable of protruding out of the surface of the driving shaft (3) are embedded in the key grooves I (302), and key grooves II (3011) capable of being matched with the key bodies (303) penetrate through the inner wall of the reduction gearbox connecting block II (301).
  10. 10. A control method of a fan switch type baffle anti-falling device of a thermal power plant is characterized by comprising the following steps of S1, mounting and fixing, wrapping a first fixing plate (401) and a second fixing plate (402) on a driving shaft (3) and surrounding the driving shaft to form a fixing ring (4), aligning a threaded hole (405) of a first locking plate (403) with a through hole (406) of a second locking plate (404) and penetrating a locking bolt to screw the fixing ring (4) so that the first limiting block (5) is driven to be fixed on the driving shaft (3), sleeving a second limiting block (6) and a compression spring (7) into the driving shaft (3) in sequence, enabling a first limiting bulge (501) of the first limiting block (5) and a second limiting bulge (601) of the second limiting block (6) to be preliminarily corresponding, embedding a key body (303) into a key groove (302) of the driving shaft (3), enabling a second reduction gearbox connecting block (301) to be matched with the driving shaft (3) through the key groove (3011), adjusting the angle of the second limiting bulge (6) to enable the second limiting bulge (501) to be fixed on the driving shaft (3), enabling the first limiting bulge (101) to be mutually pushed by the second limiting bulge (501) to be in a sliding state, enabling the first reduction gearbox (301) to be in a sliding state to be connected to a first reduction gearbox (101), when maintenance or adjustment is needed, the second limit block (6) is rotated circumferentially, the second limit protrusion (601) is rotated into the first limit groove (502), the first limit protrusion (501) is rotated into the second limit groove (602) to release the axial limit, the second reduction gearbox connecting block (301) is pushed to slide to one side of the baffle plate (2), an operation space in which the second reduction gearbox connecting block (301) and the first reduction gearbox connecting block (101) can be separated and rotated relatively is reserved, S4, state reset and maintenance are carried out, and after adjustment is completed, the second limit block (6) is rotated reversely, and the anti-falling state of the first limit protrusion (501) and the second limit protrusion (601) which are in re-abutting connection is restored.

Description

Anti-falling device for fan switch type baffle of thermal power plant and control method Technical Field The invention belongs to the technical field of fan accessories of a thermal power plant, and particularly relates to an anti-falling device of a switch-type baffle of a fan of the thermal power plant and a control method. Background In a thermal power plant, a fan is one of key equipment for ensuring safe and stable operation of a boiler. Induced draft fans are typically equipped with adjustable damper doors for controlling the air flow or isolation system. The action of baffle door is generally through driving like the reducing gear box, and the output shaft of reducing gear box passes through the crank arm of shaft coupling and baffle and links to each other, and the shaft coupling has high-efficient, the stability of transmission power and can bear the advantage of great moment of torsion to transmit rotary motion to the baffle, realize its opening or closing. In actual operation, particularly under the working conditions of vibration, thermal stress and frequent start and stop for a long time, the connection part between the baffle plate crank arm and the output shaft of the reduction gearbox is easy to loose or wear. However, the original design often lacks an effective axial anti-falling locking structure, and once the axial displacement and even complete disconnection occur in connection, the reduction gearbox can normally receive the instruction and act, but the output torque of the reduction gearbox cannot be effectively transmitted to the baffle, so that the actual position of the baffle is inconsistent with the instruction. And the reduction gearbox is in a fully-opened state or a half-opened state, so that the anti-falling locking structure is required to be unlocked, and part of connecting parts of the coupler can move leftwards to adapt to the state adjustment of the reduction gearbox. The idle running or the disengaging state is seriously damaged, and for the induced draft fan, the air flow balance in the air duct can be directly disturbed due to the fact that the inlet or the outlet baffle plate does not act as required, abnormal blowing phenomenon of the draft fan can be caused, and serious deviation of outlet temperatures at two sides is caused. More seriously, the normal operation working point of the fan can be damaged, the stall or surge of the fan is extremely easy to induce, the safety and the efficiency of the fan are seriously influenced, the pressure of a boiler hearth is out of control, the stable operation of the whole thermal power generating unit is seriously threatened, and even an unplanned shutdown accident can be caused. Therefore, how to ensure the connection reliability between the baffle crank arm and the reduction gearbox and prevent the baffle crank arm from being accidentally disconnected during operation is a technical problem to be solved in the field. Disclosure of Invention The invention provides an anti-falling device for a switch-type baffle of a fan of a thermal power plant, which aims to solve the problem of transmission disconnection caused by displacement of an axial transmission part of a reduction gearbox. The invention is realized by the following technical scheme: The utility model provides a fan switch formula baffle anticreep device of thermal power plant, includes the reducing gear box body, the output of reducing gear box body has the baffle through elastic coupling, elastic coupling is including reducing gear box that can mutually support even piece one and reducing gear box even piece two, and reducing gear box even piece one connects the output at the reducing gear box body, runs through in the reducing gear box even piece two and has the drive shaft of connecting the baffle, baffle and reducing gear box even piece two are equipped with stopper first and stopper second in the cover in proper order in the drive shaft between, the one end that the stopper first is close to stopper second is equipped with spacing protruding first, be equipped with on the stopper second can with spacing protruding first matched with spacing protruding second, spacing protruding first with spacing protruding second butt prevent the sliding of reducing gear box even piece two baffle one sides. According to the structure, the engagement state of the second connecting block of the reduction gearbox and the first connecting block of the reduction gearbox is stable through the abutting of the first limiting protrusion and the second limiting protrusion, free leftward sliding of the second connecting block of the reduction gearbox can be realized after the two limiting protrusions are staggered, and the coordination adjustment of the specific opening state of the reduction gearbox is realized. According to the invention, the first limiting blocks are uniformly provided with at least two first limiting protrusions, and a first limiting groove is formed between every two a