CN213930996U

CN213930996U - Be applied to large-scale cigarette wind channel of power plant cigarette wind channel

Info

Publication number: CN213930996U
Application number: CN202022577942.XU
Authority: CN
Inventors: 孙传祥
Original assignee: Jiangsu Hongcheng Electromechanical Equipment Co ltd
Current assignee: Jiangsu Hongcheng Electromechanical Equipment Co ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-08-10
Anticipated expiration: 2030-11-10

Abstract

The utility model discloses a be applied to large-scale cigarette wind channel in power plant cigarette wind channel, the utility model discloses a can dismantle first supporting component, the second supporting component of being connected with first fixed column, second fixed column respectively, solved and supported the installation complicacy, the problem that wastes time and energy in the current. Providing a plurality of mounting positions with different heights through a plurality of slots with different heights; insert the slot through the inserted bar in, plug-in type connects convenient and fast, utilizes the first fixed column arc surface of pinch-off blades butt, and spring A, spring B, spring C produce elasticity, and the pinch-off blades presss from both sides tight first fixed column. A plurality of mounting positions with different heights are provided through a plurality of clamping grooves with different heights; a wedge block mechanism is formed by the clamping groove, the driving block, the driving rod A, the driving rod B, the driving rod C and the like, and the vertical motion of the driving block A is converted into the horizontal motion of the clamping rod, so that the clamping rod is inserted into or separated from the clamping groove; through rotating the bull stick, drive two clamping bar work simultaneously, the mounting means is simple swift.

Description

Be applied to large-scale cigarette wind channel of power plant cigarette wind channel

Technical Field

The utility model particularly relates to a be applied to large-scale cigarette wind channel in power plant cigarette wind channel.

Background

Boilers in coal-fired power plants and other industrial facilities are often provided with circular flue ducts to achieve the purpose of air supply and smoke exhaust. The circular smoke wind channel has the advantages of uniform circumferential stress, good stress state, no need of internal bracing and capability of reducing the reinforcing member and the through-flow resistance, thereby being increasingly applied to large-scale thermal power generating units.

Along with the increase of the amount of flue gas, the section size of a flue gas duct also increases along with the increase of the amount of flue gas, in order to improve the intensity and the stability of circular flue gas duct, can install the interior support in the flue gas duct, but current interior support generally is the shaft-like, and the installation is complicated, wastes time and energy, and it is very inconvenient to change or adjust.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the weak point of prior art, the utility model provides a be applied to large-scale cigarette wind channel in power plant cigarette wind channel.

The utility model provides a technical scheme of above-mentioned problem does: a large-scale flue gas duct applied to a flue gas duct of a power plant comprises a flue gas duct body with a circular section and a plurality of supporting structures which are arranged in the flue gas duct body and distributed along the central axis direction of the flue gas duct body;

the supporting structure comprises a pair of first fixing columns which are arranged on the inner wall of the smoke and air duct body, are bilaterally symmetrical relative to the smoke and air duct body and have an included angle of 180 degrees, and a pair of second fixing columns which are arranged on the inner wall of the smoke and air duct body and are symmetrical front and back relative to the smoke and air duct body, wherein the second fixing columns are positioned between the two first fixing columns, the included angle between the second fixing columns and the first fixing columns is 90 degrees, the smoke and air duct comprises a support column, a pair of first support assemblies, a pair of second support assemblies and a pair of third support assemblies, wherein the support column is coaxial with the smoke and air duct body, one end of each first support assembly is mounted on the support column, the other end of each first support assembly is detachably connected with the corresponding first fixed column, an included angle between every two adjacent first support assemblies is 180 degrees, one end of each second support assembly is mounted on the support column, the other end of each second support assembly is detachably connected with the corresponding second fixed column, the second support assemblies are located between every two adjacent first support assemblies, and the included angles between the second support assemblies and the first support assemblies are 90 degrees;

the first support component comprises a first reinforcement column arranged on a support column, a first support shell which is arranged on the first reinforcement column and is positioned at one end of the first reinforcement column far away from the support column, a first rod which is movably arranged on the first support shell and is positioned at one end of the first support shell far away from the support column, a clamping plate which is arranged on the first rod and is provided with an arc surface at the other end and is positioned outside the shell, a second rod which is arranged on the first rod and is positioned in the shell and is T-shaped in horizontal plane projection, a first limit area and a second limit area which are symmetrical in front and back relative to the first rod are formed between the second rod and the first rod, a static column A and a static column B which are arranged in the first support shell and are symmetrical in front and back relative to the first rod, a third rod which is arranged on the static column A through a rolling bearing, a movable column A which is arranged on the third rod and is always positioned in the first limit area and drives the first rod to move, a movable column A which is arranged on the static column B through a rolling bearing, A fourth rod which is always symmetrical with the third rod about the first rod, a movable column B which is arranged on the fourth rod and is always positioned in the second limit area and drives the first rod to move, a fifth rod which is arranged in the first supporting shell in a movable way and is positioned at one end of the first supporting shell close to the first reinforcing column, a spring A which is arranged on the second rod at one end and is arranged on the fifth rod at the other end, a sixth rod and a seventh rod which are respectively arranged at two ends of the fifth rod and are positioned in the first supporting shell, an eighth rod which is arranged on the sixth rod and has an L-shaped horizontal plane projection, a ninth rod which is arranged on the seventh rod and has an L-shaped horizontal plane projection, a third limit area is formed between the sixth rod and the eighth rod, a fourth limit area is formed between the seventh rod and the ninth rod, a guide rod A which is arranged on the eighth rod at one end and is movably arranged on the first supporting shell at the other end, and a guide rod B which is arranged on the ninth rod and has the other end movably arranged on the first supporting shell, one end of the spring B is arranged on the first supporting shell, the other end of the spring B is arranged on the sixth rod, one end of the spring C is arranged on the first supporting shell, the other end of the spring C is arranged on the seventh rod, the spring C is arranged on the third rod, the third rod is always positioned in the third limiting area and drives the movable column C to move, the movable column D is arranged on the fourth rod and is always positioned in the fourth limiting area and drives the eighth rod to move, and the inserting rod which is L-shaped is arranged on the first supporting shell.

Further, be equipped with the arc surface of mutually supporting with the pinch-off blades on the first fixed column, be equipped with a plurality of along a plurality of slots of flue central axis direction evenly distributed on the first fixed column, the slot is mutually supported with the inserted bar, and the inserted bar inserts in the slot.

Furthermore, a first through hole for the first rod to pass through is formed in the first supporting shell, and the first rod is matched with the first through hole in shape; a second through hole for the fifth rod to pass through is formed in the first supporting shell, and the fifth rod is matched with the second through hole in shape; a third through hole for the spring A to pass through is formed in the first supporting shell; a fourth through hole for the guide rod A to pass through is formed in the first support shell, and the guide rod A is matched with the fourth through hole in shape; and a fifth through hole for the guide rod B to pass through is formed in the first supporting shell, and the guide rod B is matched with the fifth through hole in shape.

Further, the second supporting component comprises a second supporting shell installed on the supporting column, a supporting plate installed in the second supporting shell, a driving block with a parallelogram structure in cross section, a driving rod A installed at the upper end of the driving rod and penetrating through the second supporting shell and movably installed on the second supporting shell, a driving rod B installed at the lower end of the driving rod and penetrating through the second supporting shell and movably installed on the second supporting shell, a rotating rod connected with the supporting column in a threaded manner, a rotating ring installed on the rotating rod through a rolling bearing in a rotating manner, a driving rod C installed on the rotating ring at one end and installed on the driving rod B at the other end, a clamping rod installed on the second supporting shell at one end in a movable manner and installed on the supporting plate at the other end in a penetrating manner, and a through groove matched with the driving block is formed in the clamping rod.

Furthermore, a plurality of clamping grooves which are uniformly distributed along the central axis direction of the smoke air duct are formed in the second fixing column, the clamping grooves are matched with the clamping rods, and the clamping rods are inserted into the clamping grooves.

Furthermore, a through hole A for the driving rod A to pass through is formed in the second supporting shell, and the driving rod A is matched with the through hole A in shape; the second support shell is provided with a through hole B for the driving rod B to pass through, and the driving rod B is matched with the through hole B in shape; the second support shell is provided with a through hole C for the driving rod C to pass through, and the driving rod C is matched with the through hole C in shape; the supporting plate is provided with a through hole D for the driving rod C to pass through, and the driving rod C is matched with the through hole D in shape.

The utility model discloses beneficial effect has: the utility model discloses a can dismantle first supporting component, the second supporting component of being connected with first fixed column, second fixed column respectively, solve the problem that the installation is complicated, waste time and energy in current shaft-like interior support. Providing a plurality of mounting positions with different heights through a plurality of slots with different heights; insert the slot through the inserted bar in, plug-in type connects convenient and fast, utilizes the first fixed column arc surface of pinch-off blades butt, and spring A, spring B, spring C produce elasticity, and the pinch-off blades presss from both sides tight first fixed column. A plurality of mounting positions with different heights are provided through a plurality of clamping grooves with different heights; a wedge block mechanism is formed by the clamping groove, the driving block, the driving rod A, the driving rod B, the driving rod C and the like, and the vertical motion of the driving block A is converted into the horizontal motion of the clamping rod, so that the clamping rod is inserted into or separated from the clamping groove; through rotating the bull stick, drive two clamping bar work simultaneously, the mounting means is simple swift.

Drawings

Fig. 1 is a top view of the present invention;

fig. 2 is a top view partially in section of the present invention;

fig. 3 is a top sectional view of the first support assembly of the present invention;

fig. 4 is a schematic view of the first support assembly of the present invention in a front view;

fig. 5 is a front sectional view of the second support assembly of the present invention.

In the figure:

1-flue body, 2-support structure, 3-first fixed column, 4-second fixed column, 5-first support assembly, 6-second support assembly, 7-first reinforcement column, 8-first support shell, 9-first rod, 10-clamping plate, 11-second rod, 12-static column A, 13-static column B, 14-third rod, 15-dynamic column A, 16-dynamic column B, 17-fifth rod, 18-sixth rod, 19-seventh rod, 20-spring A, 21-eighth rod, 22-ninth rod, 23-guide rod A, 24-guide rod B, 25-spring B, 26-spring C, 27-dynamic column C, 28-dynamic column D, 29-inserted rod, 31-second support shell, 32-support plate, 33-drive block, 34-drive rod A, 35-drive rod B, 36-rotating rod, 37-rotating ring, 38-drive rod C, 39-clamping rod and 42-support column.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

A large-scale flue gas duct applied to a flue gas duct of a power plant comprises a flue gas duct body 1 with a circular section and a plurality of supporting structures 2 which are arranged in the flue gas duct body 1 and distributed along the central axis direction of the flue gas duct body 1;

the supporting structure 2 comprises a pair of first fixing columns 3 which are arranged on the inner wall of the smoke and air duct body 1, are bilaterally symmetrical relative to the smoke and air duct body 1 and have an included angle of 180 degrees, a pair of second fixing columns 4 which are arranged on the inner wall of the smoke and air duct body 1 and are symmetrical front and back relative to the smoke and air duct body 1, the second fixing columns 4 are positioned between the two first fixing columns 3, the included angle between the second fixing columns 4 and the first fixing columns 3 is 90 degrees, a supporting column 42 which is coaxially arranged with the smoke and air duct body 1, a pair of first supporting assemblies 5 of which one end is arranged on the supporting column 42 and the other end is detachably connected with the first fixing columns 3, the included angle between the two adjacent first supporting assemblies 5 is 180 degrees, a pair of second supporting assemblies 6 of which one end is arranged on the supporting column 42 and the other end is detachably connected with the second fixing columns 4, and the second supporting assemblies 6 are positioned between the two adjacent first supporting assemblies 5, the included angle between the second supporting component 6 and the first supporting component 5 is 90 degrees;

through first supporting component 5, the second supporting component 6 of dismantling the connection with first fixed column 3, second fixed column 4 respectively, solved the problem that the installation is complicated, waste time and energy in current shaft-like interior support.

The first support assembly 5 comprises a first reinforcing column 7 arranged on a support column 42, a first support shell 8 arranged on the first reinforcing column 7 and positioned at one end of the first reinforcing column 7 far away from the support column 42, a first rod 9 movably arranged on the first support shell 8 and positioned at one end of the first support shell 8 far away from the support column 42, a clamping plate 10 with one end arranged on the first rod 9 and the other end being an arc surface and positioned outside the shell, a second rod 11 arranged on the first rod 9 and positioned in the shell and having a T-shaped horizontal plane projection, a first limit area and a second limit area which are symmetrical in the front-back direction relative to the first rod 9 and formed between the second rod 11 and the first rod 9, a static column A12 and a static column B13 which are arranged in the first support shell 8 and symmetrical in the front-back direction relative to the first rod 9, a third rod 14 arranged on the static column A12 through a rolling bearing in a rotating manner, and a third rod 14 arranged on the third rod and positioned in the first limit area all the time, A movable column A15 driving the first rod 9 to move, a movable column B16 rotatably installed on the fixed column B13 through a rolling bearing, a fourth rod always symmetrical to the third rod 14 with respect to the first rod 9, a movable column B16 installed on the fourth rod and always located in the second limit area and driving the first rod 9 to move, a fifth rod 17 with two ends movably installed in the first support case 8 and located at one end of the first support case 8 close to the first reinforcement column 7, a spring A20 with one end installed on the second rod 11 and the other end installed on the fifth rod 17, a sixth rod 18 and a seventh rod 19 installed at two ends of the fifth rod 17 and located in the first support case 8, an eighth rod 21 installed on the sixth rod 18 and having an L-shaped horizontal plane projection, a ninth rod 22 installed on the seventh rod 19 and having an L-shaped horizontal plane projection, a third limit area formed between the sixth rod 18 and the eighth rod 21, and a fourth limit area formed between the seventh rod 19 and the ninth rod 22, one end is installed on eighth pole 21 and the other end movably installs guide bar A23 on first support shell 8, one end is installed on ninth pole 22 and the other end movably installs guide bar B24 on first support shell 8, one end is installed on first support shell 8 and the other end installs spring B25 on sixth pole 18, one end is installed at first support shell 8 and the other end installs spring C26 at seventh pole 19, install on third pole 14 and be located the third spacing district all the time, drive the movable column C27 of seventh pole 19 motion, install on the fourth pole and be located the fourth spacing district all the time, drive movable column D28 of eighth pole 21 motion, install on first support shell 8 and be L-shaped inserted bar 29.

The first fixing column 3 is provided with an arc surface matched with the clamping plate 10, the first fixing column 3 is provided with a plurality of slots uniformly distributed along the central axis direction of the flue gas duct, the slots are matched with the insertion rods 29, and the insertion rods 29 are inserted into the slots.

The first supporting shell 8 is provided with a first through hole for the first rod 9 to pass through, and the first rod 9 is matched with the first through hole in shape; a second through hole for the fifth rod 17 to pass through is formed in the first supporting shell 8, and the fifth rod 17 is matched with the second through hole in shape; a third through hole for the spring A20 to pass through is arranged on the first supporting shell 8; a fourth through hole for the guide rod A23 to pass through is formed in the first supporting shell 8, and the guide rod A23 is matched with the fourth through hole in shape; the first supporting shell 8 is provided with a fifth through hole for the guide rod B24 to pass through, and the guide rod B24 is matched with the fifth through hole in shape.

When the first supporting component 5 is not in operation, the spring A20 is at the original length, and the distance between the inserted bar 29 and the clamping plate 10 is L1; the distance between the slot and the arc surface of the first fixing column 3 is L2, and L2 is greater than L1.

When the clamping plate 10 clamps the first fixed column 3, the clamping plate 10 moves towards the direction close to the first supporting shell 8, under the action of the movable column a15 and the movable column B16, the third rod 14 and the fourth rod rotate in opposite directions, the movable column C27 and the movable column D28 rotate to drive the fifth rod 17 to move towards the direction close to the first rod 9, the direction of the fifth rod 17 is opposite to the direction of the first rod 9, and the spring a20 compresses to generate elastic force, so that the clamping plate 10 clamps the first fixed column 3.

Providing a plurality of mounting positions with different heights through a plurality of slots with different heights; the inserting rod 29 is inserted into the inserting groove, the inserting connection is convenient and fast, the clamping plate 10 is abutted to the arc surface of the first fixing column 3, the spring A20, the spring B25 and the spring C26 generate elastic force, and the clamping plate 10 clamps the first fixing column 3.

The second support assembly 6 includes a second support housing 31 mounted on the support column 42, a support plate 32 mounted in the second support housing 31, a driving block 33 having a parallelogram structure in cross section, a driving rod a34 mounted at an upper end of the driving rod and passing through the second support housing 31 and movably mounted on the second support housing 31, a driving rod B35 mounted at a lower end of the driving rod and passing through the second support housing 31 and movably mounted on the second support housing 31, a rotary rod 36 threadedly coupled with the support column 42, the rotating ring 37 installed on the rotating rod 36 is rotated through a rolling bearing, the driving rod C38 is installed on the rotating ring 37 at one end and installed on the driving rod B35 at the other end, the clamping rod 39 is installed on the second supporting shell 31 at one end and movably installed on the supporting plate 32 at the other end, and the through groove matched with the driving block 33 is formed in the clamping rod 39.

The second fixing column 4 is provided with a plurality of clamping grooves which are uniformly distributed along the central axis direction of the flue gas duct, the clamping grooves correspond to the inserting grooves one to one, the clamping grooves are matched with the clamping rods 39, and the clamping rods 39 are inserted into the clamping grooves.

The second support shell 31 is provided with a through hole A for the driving rod A34 to pass through, and the driving rod A34 is matched with the through hole A in shape; the second support shell 31 is provided with a through hole B for the driving rod B35 to pass through, and the driving rod B35 is matched with the through hole B in shape; the second support shell 31 is provided with a through hole C for the driving rod C38 to pass through, and the driving rod C38 is matched with the through hole C in shape; the supporting plate 32 is provided with a through hole D for the driving rod C38 to pass through, and the driving rod C38 is matched with the through hole D in shape.

A plurality of mounting positions with different heights are provided through a plurality of clamping grooves with different heights; a wedge mechanism is formed by the clamping groove, the driving block 33, the driving rod A34, the driving rod B35, the driving rod C38 and the like, the vertical movement of the driving block 33A is converted into the horizontal movement of the clamping rod 39, and the clamping rod 39 is inserted into or separated from the clamping groove; by rotating the rotating rod 36, the two clamping rods 39 are driven to work simultaneously, and the installation mode is simple and quick.

The utility model discloses the theory of operation:

(1) pushing the fifth rod 17 to move the fifth rod 17 toward the first supporting shell 8, so as to drive the first rod 9 to move toward the first supporting shell 8, and the distance between the insert rod 29 and the clamping plate 10 is increased;

(2) selecting a slot with a proper height according to requirements, and inserting the inserting rod 29 into the slot; the fifth rod 17 is loosened, and the clamping plate 10 clamps the first fixing column 3;

(3) when the rotating rod 36 is rotated, the driving rod a34 and the driving rod B35 move upwards, the driving block 33 moves along with the driving rod a34 and the driving rod B35, so that the driving rod C38 is driven to move towards the direction close to the second fixing column 4, and the clamping rod 39 is inserted into the clamping groove.

Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, and that the scope of the invention is defined by the appended claims.

Claims

1. A large-scale flue gas duct applied to a flue gas duct of a power plant is characterized by comprising a flue gas duct body (1) with a circular section and a plurality of supporting structures (2) which are arranged in the flue gas duct body (1) and distributed along the central axis direction of the flue gas duct body (1);

the supporting structure (2) comprises a pair of first fixing columns (3) which are arranged on the inner wall of the smoke and air duct body (1) and are bilaterally symmetrical relative to the smoke and air duct body (1) and have an included angle of 180 degrees, a pair of second fixing columns (4) which are arranged on the inner wall of the smoke and air duct body (1) and are symmetrical front and back relative to the smoke and air duct body (1), the second fixing columns (4) are positioned between the two first fixing columns (3), the included angle between each second fixing column (4) and the corresponding first fixing column (3) is 90 degrees, a supporting column (42) which is coaxial with the smoke and air duct body (1), a pair of first supporting assemblies (5) with one ends arranged on the supporting columns (42) and the other ends detachably connected with the first fixing columns (3), the included angle between every two adjacent first supporting assemblies (5) is 180 degrees, a pair of second supporting assemblies (6) with one ends arranged on the supporting columns (42) and the other ends detachably connected with the second fixing columns (4), the second supporting component (6) is positioned between two adjacent first supporting components (5), and the included angle between the second supporting component (6) and the first supporting components (5) is 90 degrees;

the first support assembly (5) comprises a first reinforcing column (7) arranged on a support column (42), a first support shell (8) which is arranged on the first reinforcing column (7) and is located at one end, far away from the support column (42), of the first reinforcing column (7), a first rod (9) which is movably arranged on the first support shell (8) and is located at one end, far away from the support column (42), of the first support shell (8), a clamping plate (10) which is arranged outside the shell and has one end arranged on the first rod (9) and the other end being an arc surface, a second rod (11) which is arranged on the first rod (9) and is located in the shell and has a T-shaped horizontal plane projection, a first limit area and a second limit area which are symmetrical in front and back relative to the first rod (9) are formed between the second rod (11) and the first rod (9), and a static column A (12) which is arranged in the first support shell (8) and is symmetrical in front and back relative to the first rod (9), A static column B (13), a third rod (14) rotatably mounted on the static column A (12) through a rolling bearing, a movable column A (15) rotatably mounted on the third rod (14) and always positioned in a first limit area and driving the first rod (9) to move, a fourth rod rotatably mounted on the static column B (13) through a rolling bearing and always symmetrical to the third rod (14) about the first rod (9), a fifth rod (17) mounted on the fourth rod and always positioned in a second limit area and driving the first rod (9) to move, a spring A (20) with two ends movably mounted in the first support shell (8) and positioned at one end of the first support shell (8) close to the first reinforcement column (7), a spring A (20) with one end mounted on the second rod (11) and the other end mounted on the fifth rod (17), a sixth rod (18) mounted at two ends of the fifth rod (17) and positioned in the first support shell (8), and a spring A (20) with one end mounted at the other end mounted on the second rod (11) and the other end mounted on the fifth rod (17) respectively, A seventh rod (19), an eighth rod (21) which is installed on the sixth rod (18) and has an L-shaped horizontal plane projection, a ninth rod (22) which is installed on the seventh rod (19) and has an L-shaped horizontal plane projection, a third limit area is formed between the sixth rod (18) and the eighth rod (21), a fourth limit area is formed between the seventh rod (19) and the ninth rod (22), a guide rod A (23) which has one end installed on the eighth rod (21) and the other end movably installed on the first support shell (8), a guide rod B (24) which has one end installed on the ninth rod (22) and the other end movably installed on the first support shell (8), a spring B (25) which has one end installed on the first support shell (8) and the other end installed on the sixth rod (18), a spring C (26) which has one end installed on the first support shell (8) and the other end installed on the seventh rod (19), install on third pole (14) and be located the spacing district of third all the time, drive the post C (27) that moves of seventh pole (19), install on the fourth pole and be located the spacing district of fourth all the time, drive the post D (28) that moves of eighth pole (21), install on first support shell (8) and be inserted bar (29) of L shape.

2. The large-scale flue duct applied to the flue duct of the power plant as claimed in claim 1, wherein the first fixing column (3) is provided with a circular arc surface matched with the clamping plate (10), the first fixing column (3) is provided with a plurality of slots uniformly distributed along the central axis direction of the flue duct, the slots are matched with the insertion rods (29), and the insertion rods (29) are inserted into the slots.

3. A large flue duct for a flue duct of a power plant according to claim 1, wherein the first supporting shell (8) is provided with a first through hole for the first rod (9) to pass through, and the first rod (9) is matched with the first through hole in shape; a second through hole for the fifth rod (17) to pass through is formed in the first supporting shell (8), and the fifth rod (17) is matched with the second through hole in shape; a third through hole for the spring A (20) to pass through is formed in the first supporting shell (8); a fourth through hole for the guide rod A (23) to pass through is formed in the first supporting shell (8), and the guide rod A (23) is matched with the fourth through hole in shape; and a fifth through hole for the guide rod B (24) to pass through is formed in the first supporting shell (8), and the guide rod B (24) is matched with the fifth through hole in shape.

4. A large flue duct for a flue duct of a power plant according to claim 1, 2 or 3, wherein the second support assembly (6) comprises a second support housing (31) mounted on a support column (42), a support plate (32) mounted in the second support housing (31), a driving block (33) having a cross-section of a parallelogram structure, a driving rod A (34) mounted at an upper end of the driving rod and passing through the second support housing (31) and movably mounted on the second support housing (31), a driving rod B (35) mounted at a lower end of the driving rod and passing through the second support housing (31) and movably mounted on the second support housing (31), a rotating rod (36) threadedly connected to the support column (42), a rotating ring (37) rotatably mounted on the rotating rod (36) by a rolling bearing, a driving rod C (38) having one end mounted on the rotating ring (37) and the other end mounted on the driving rod B (35), one end of the clamping rod (39) is movably arranged on the supporting plate (32) and the other end of the clamping rod penetrates through the second supporting shell (31) and is movably arranged on the second supporting shell (31), and a through groove matched with the driving block (33) is formed in the clamping rod (39).

5. A large flue duct for a flue duct of a power plant according to claim 4, wherein the second fixing column (4) is provided with a plurality of clamping grooves uniformly distributed along the central axis of the flue duct, the clamping grooves are matched with the clamping rods (39), and the clamping rods (39) are inserted into the clamping grooves.

6. The large flue duct applied to the flue duct of the power plant as claimed in claim 4, wherein the second supporting shell (31) is provided with a through hole A for passing the driving rod A (34), and the driving rod A (34) is matched with the through hole A in shape; a through hole B for the driving rod B (35) to pass through is formed in the second supporting shell (31), and the driving rod B (35) is matched with the through hole B in shape; a through hole C for the driving rod C (38) to pass through is formed in the second supporting shell (31), and the driving rod C (38) is matched with the through hole C in shape; the supporting plate (32) is provided with a through hole D for the driving rod C (38) to pass through, and the driving rod C (38) is matched with the through hole D in shape.

7. The large flue duct applied to the flue duct of the power plant as claimed in claim 5, wherein the second supporting shell (31) is provided with a through hole A for passing the driving rod A (34), and the driving rod A (34) is matched with the through hole A in shape; a through hole B for the driving rod B (35) to pass through is formed in the second supporting shell (31), and the driving rod B (35) is matched with the through hole B in shape; a through hole C for the driving rod C (38) to pass through is formed in the second supporting shell (31), and the driving rod C (38) is matched with the through hole C in shape; the supporting plate (32) is provided with a through hole D for the driving rod C (38) to pass through, and the driving rod C (38) is matched with the through hole D in shape.