Quick cooling section air duct baffle valve

Abstract

The invention provides a rapid cooling section air duct baffle valve. The rapid cooling section air duct baffle valve comprises a supporting frame, a U-shaped guide support, a crank transmission structure, a center shaft and a baffle valve body. The U-shaped guide bracket is arranged on a guide rail of the support frame in a linear reciprocating motion manner; one end of the crank transmission structure can be arranged in the U-shaped groove in a rolling translation manner along the inner wall of the U-shaped groove of the U-shaped guide bracket, and the other end of the crank transmission structure is in transmission connection with the top end of the central shaft and is used for driving the central shaft to rotate in the air duct of the shell of the rapid cooling section; the central shaft is rotatably arranged in the air duct of the shell; the baffle valve body is arranged on the center shaft in a sleeving mode and rotatably arranged in the air channel of the shell so as to open or close the air channel. The device is compact in structure, small in occupied area, capable of being embedded into an air duct box body to rapidly adjust the air duct, easy and convenient to disassemble and assemble, easy to overhaul and maintain and reliable and durable in structural design.

Description

Technical Field

[0001] The invention relates to the field of annealing furnaces, and in particular to a fast cooling section air duct baffle valve. Background Art

[0002] In the field of galvanizing annealing furnaces in the metallurgical industry, the damper valve in the rapid cooling section air duct can be used for galvanizing and other annealing processes.

[0003] However, the shell and baffle valve structures in the existing air duct design are arranged in a relatively scattered manner, occupying a large area, and the air duct cannot be quickly adjusted, which makes it difficult to meet the requirements of fast response speed and high adjustment accuracy. Summary of the invention

[0004] One of the purposes of the present invention is to provide a fast cooling section air duct baffle valve, which can not only quickly respond to the opening and closing of the air duct, but also accurately adjust the opening and closing angles of the baffle valve body to meet the needs of controlling the furnace temperature of the cooling furnace section.

[0005] The technical solution of the present invention is:

[0006] A fast cooling section air duct baffle valve, comprising a support frame, a U-shaped guide frame, a crank transmission structure, a central shaft and a baffle valve body; the U-shaped guide frame can be arranged on the guide rail of the support frame for linear reciprocating movement; one end of the crank transmission structure can be arranged in the U-shaped groove in a rolling and translational manner along the inner wall of the U-shaped groove of the U-shaped guide frame, and the other end is transmission-connected to the top end of the central shaft, for driving the central shaft to rotate in the air duct of the shell of the fast cooling section; the central shaft is rotatably arranged in the air duct of the shell; the baffle valve body is sleeved on the central shaft and rotatably arranged in the air duct of the shell to open or close the air duct.

[0007] As a technical solution of the present invention, it also includes a driver, one end of which is drivingly connected to the outer wall of the U-shaped guide bracket, and is used to drive the U-shaped guide bracket to perform linear reciprocating movement on the guide rail.

[0008] As a technical solution of the present invention, the driver includes a bidirectional cylinder or a double-head electric cylinder.

[0009] As a technical solution of the present invention, the U-shaped guide bracket includes a sliding guide plate and a U-shaped limiting plate; the sliding guide plate can be arranged on the guide rail for linear reciprocating movement; the top end of the U-shaped limiting plate is installed on the bottom end of the sliding guide plate, and the opening direction is perpendicular to the moving direction of the U-shaped guide bracket; the U-shaped limiting plate is arranged to form the U-shaped groove.

[0010] As a technical solution of the present invention, the U-shaped limiting plate includes a first straight plate, a U-shaped connecting plate and a second straight plate which are connected in sequence.

[0011] As a technical solution of the present invention, the crank transmission structure includes a roller, a connecting rod, a V-crank and a connecting head; the roller is rotatably mounted on the top end of the connecting rod and is rollably disposed on the inner wall of the U-shaped groove; the connecting rod is vertically disposed in the U-shaped cavity of the U-shaped groove, and the bottom end extends out of the U-shaped cavity and is vertically connected to one end of the V-crank; the V-crank is horizontally disposed, and the other end is vertically connected to the side wall of the connecting head; the connecting head is sleeved on the top end of the central shaft to drive the central shaft to rotate.

[0012] As a technical solution of the present invention, it also includes an upper shaft head; the upper shaft head is installed on the upper sleeve on the top of the shell and is sleeved on the upper end of the central shaft.

[0013] As a technical solution of the present invention, the upper shaft head includes an upper joint bearing, two sealing rings, a retaining ring and a retaining ring; the upper joint bearing is installed on the inner circumferential wall of the upper sleeve at the top of the shell, and is sleeved on the upper end of the center shaft; one of the sealing rings, the retaining ring, the other sealing ring and the retaining ring are sequentially sleeved on the upper end of the center shaft from bottom to top, and are all clamped on the inner circumferential wall of the upper cover at the top of the shell; the upper cover is installed on the top of the upper sleeve through a gasket, and the upper cover, the gasket and the upper sleeve are sequentially connected by bolts; an oil cup for injecting lubricating oil is provided on the side wall of the upper cover.

[0014] As a technical solution of the present invention, it also includes a lower shaft head; the lower shaft head is installed on the lower sleeve at the bottom of the shell and is sleeved on the lower end of the central shaft.

[0015] As a technical solution of the present invention, the lower shaft head includes a lower joint bearing, a ball bearing and a flat washer; the ball bearing, the flat washer and the lower joint bearing are sequentially sleeved on the lower end of the center shaft from top to bottom, and the lower joint bearing is installed on the inner circumferential wall of the lower sleeve at the bottom of the shell; the lower cover at the bottom of the shell is installed on the bottom of the lower sleeve through a gasket, and the lower cover, the gasket and the lower sleeve are sequentially connected by bolts.

[0016] Beneficial effects of the present invention:

[0017] The device is connected to the crank transmission structure through the top of the baffle valve body, and the top of the crank transmission structure can be arranged in the U-shaped groove in a rolling and translational manner along the inner wall of the U-shaped groove of the U-shaped guide bracket, so that when the U-shaped guide bracket moves linearly on the guide rail, it can drive the crank transmission structure to rotate and slide translationally on the inner wall of the U-shaped groove at the same time, and then drive the central axis connected to it to rotate by controlling the rotation of the crank transmission structure, thereby driving the baffle valve body to rotate and completing the opening and closing process of the baffle valve of the entire fast cooling section air duct; therefore, it can not only quickly respond to the action of opening and closing the air duct, but also accurately adjust the opening and closing angles of the baffle valve body to meet the needs of controlling the furnace temperature of the cooling furnace section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A front view of a fast cooling section air duct baffle valve provided in an embodiment of the present invention;

[0020] Figure 2 A partial enlarged schematic diagram of a damper valve in a fast cooling section air duct provided in an embodiment of the present invention;

[0021] Figure 3 A top view of a damper valve for a quick cooling section air duct provided in an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of an upper shaft head provided in an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of a lower shaft head provided in an embodiment of the present invention;

[0024] Figure 6 A schematic diagram of a baffle valve body provided in an embodiment of the present invention;

[0025] Figure 7 A first angle schematic diagram of a baffle valve body provided in an embodiment of the present invention.

[0026] Icons: 1-support frame; 2-U-shaped guide bracket; 3-crank transmission structure; 4-center axis; 5-baffle valve body; 6-guide rail; 7-driver; 8-sliding guide plate; 9-U-shaped limit plate; 10-roller; 11-connecting rod; 12-V-crank; 13-connecting head; 14-upper shaft head; 15-lower shaft head; 16-upper joint bearing; 17-sealing ring; 18-retaining ring; 19-retaining ring; 20-upper sleeve; 21-upper cover; 22-oil cup; 23-lower joint bearing; 24-ball bearing; 25-flat washer; 26-lower sleeve; 27-lower cover; 28-housing. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present invention, it should be noted that the terms "upper" and "lower" etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0031] In addition, in the present invention, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Example:

[0035] Please refer to Figure 1 , with reference Figures 2 to 7The present invention provides a fast cooling section air duct baffle valve, comprising a support frame 1, a U-shaped guide bracket 2, a driver 7, a crank transmission structure 3, a central shaft 4, an upper shaft head 14, a lower shaft head 15 and a baffle valve body 5; wherein the U-shaped guide bracket 2 can be arranged on the guide rail 6 of the support frame 1 for linear reciprocating movement; at the same time, one end of the crank transmission structure 3 can be arranged in the U-shaped groove for rolling and translation along the inner wall of the U-shaped groove of the U-shaped guide bracket 2, and the other end is transmission-connected to the top end of the central shaft 4, for driving the central shaft 4 to rotate in the air duct of the shell 28 of the fast cooling section; the central shaft 4 is rotatably arranged in the air duct of the shell 28; the baffle valve body 5 is sleeved on the central shaft 4 and rotatably arranged in the air duct of the shell 28 to open or close the air duct; specifically, the central shaft 4 and the baffle valve body 5 are fixedly connected by a plurality of bolts, nuts and washers. The piston rod at one end of the driver 7 is connected to the outer wall of the U-shaped guide bracket 2, and is used to drive the U-shaped guide bracket 2 to perform linear reciprocating movement on the guide rail 6. The upper shaft head 14 is installed on the upper sleeve 20 at the top of the housing 28, and is sleeved on the upper end of the central shaft 4. The lower shaft head 15 is installed on the lower sleeve 26 at the bottom of the housing 28, and is sleeved on the lower end of the central shaft 4.

[0036] It should be noted that the number and design of the baffle valve bodies 5 can be adaptively changed according to the number of air ducts and design requirements. The number of baffle valve bodies 5 can be one, two, four, etc.; when the number of air ducts is one, the number of baffle valve bodies 5 is one, and its stroke is shorter. At this time, the driver 7 is also one, and the driver 7 can adopt a one-way cylinder, a one-way electric cylinder, a two-way cylinder or a double-headed electric cylinder, etc. In this case, if a two-way cylinder or a double-headed electric cylinder is used, one of the piston rods of the driver 7 may not move during operation. When the number of air ducts is two, the number of baffle valve bodies 5 is two. At this time, the baffle valve bodies 5 are arranged in parallel on the left and right sides in the corresponding air ducts, and there are two drivers 7, which are arranged in parallel on the support frame 1. The driver 7 can adopt a two-way cylinder or a double-headed electric cylinder, etc., and the telescopic rods at both ends can move. When the baffle valve bodies 5 at the two locations need to be opened and closed, the two drivers 7 can be arranged in parallel, and the rotation angle (0~90°) of the baffle valve body 5 can be controlled separately by staggered installation of two telescopic length drivers 7 and two V-shaped cranks 12 with different bending directions, where 0° is assumed to be fully closed and 90° is fully open.

[0037] Furthermore, its U-shaped guide bracket 2 includes a sliding guide plate 8 and a U-shaped limit plate 9; wherein, the sliding guide plate 8 is arranged on the guide rail 6 for linear reciprocating movement; at the same time, the top end of the U-shaped limit plate 9 is installed on the bottom of the sliding guide plate 8, and the opening direction is perpendicular to the moving direction of the U-shaped guide bracket 2; in addition, the U-shaped limit plate 9 is surrounded to form a U-shaped groove; specifically, its U-shaped limit plate 9 includes a first straight plate, a U-shaped connecting plate and a second straight plate connected in sequence, and the piston rod at one end of the driver 7 is transmission-connected to the outer wall of the first straight plate, so as to drive the U-shaped limit plate 9 to move linearly.

[0038] At the same time, its crank transmission structure 3 mainly includes a roller 10, a connecting rod 11, a V-crank 12 and a connecting head 13; wherein, the roller 10 with a built-in bearing is installed on the top end of the connecting rod 11, and is arranged on the inner wall of the U-shaped groove with a large clearance fit, and it can roll and translate on the inner wall of the U-shaped groove; at the same time, the connecting rod 11 is vertically arranged in the U-shaped cavity of the U-shaped groove, and the bottom end extends out of the U-shaped cavity and is vertically connected to one end of the V-crank 12; in addition, the V-crank 12 is horizontally arranged, and the other end is vertically connected to the side wall of the connecting head 13; the connecting head 13 is sleeved on the top end of the central shaft 4, and it is fixedly connected to the top end of the central shaft 4 by bolts, nuts and washers, and is used to drive the central shaft 4 to rotate.

[0039] Since the U-shaped limit plate 9 is designed to be U-shaped and the gap is slightly larger than the diameter of the roller 10, it is convenient for the roller 10 to make line contact with the inner wall of the U-shaped limit plate 9. The piston rod of the driver 7 is connected to the U-shaped guide bracket 2, thereby controlling the V-shaped crank 12 to drive the flapper valve body 5 to rotate, completing the entire opening and closing process of the flapper valve body 5.

[0040] Therefore, the driver 7 is started by controlling the controller in the prior art. When the driver 7 is started, the piston rod at one end of the driver 7 drives the U-shaped limit plate 9 to move linearly, thereby driving the connecting rod 11, V-shaped crank 12 and connecting head 13 connected in sequence to rotate, and at the same time drives the roller 10 connected thereto to roll on the inner wall of the U-shaped groove, thereby driving the central axis 4 and the baffle valve body 5 connected thereto to rotate a certain angle in the air duct of the shell 28, thereby realizing rapid adjustment and precise control of the opening and closing of the air duct.

[0041] Furthermore, the upper shaft head 14 is longer, and mainly includes an upper spherical bearing 16, two sealing rings 17, a retaining ring 18 and a retaining ring 19; wherein, the upper spherical bearing 16 is mounted on the inner circumferential wall of the upper sleeve 20 at the top of the shell 28, and is sleeved on the upper end of the central shaft 4, and the upper sleeve 20 is welded to the shell 28; at the same time, one of the sealing rings 17, the retaining ring 18, the other sealing ring 17 and the retaining ring 19 are sequentially sleeved on the upper end of the central shaft 4 from bottom to top, and are all clamped on the inner circumferential wall of the upper cover 21 at the top of the shell 28; in addition, the upper cover 21 is installed on the top of the upper sleeve 20 through a gasket, and the upper cover 21, the gasket and the upper sleeve 20 are sequentially connected by bolts; an oil cup 22 for injecting lubricating oil is provided on the side wall of the upper cover 21.

[0042] Furthermore, its lower shaft head 15 is shorter, and it mainly includes a lower joint bearing 23, a ball bearing 24 and a flat washer 25; wherein, the ball bearing 24, the flat washer 25 and the lower joint bearing 23 are sequentially sleeved on the lower end of the central shaft 4 from top to bottom, and the lower joint bearing 23 is installed on the inner circumferential wall of the lower sleeve 26 at the bottom of the shell 28, and the lower sleeve 26 is welded to the shell 28; at the same time, the lower cover 27 at the bottom of the shell 28 is installed on the bottom of the lower sleeve 26 through a gasket, and the lower cover 27, the gasket and the lower sleeve 26 are sequentially connected by bolts.

[0043] It should be noted that, in this embodiment, the flapper valve body 5 includes an integrally formed valve cylinder and two valve wings; the valve cylinder is in the shape of a cylinder with an opening at the top and bottom and a hollow interior; the two valve wings are integrally formed and symmetrically arranged on the opposite outer sides of the valve cylinder, and their lengths are the same as the length of the valve cylinder, and their end faces are also flush with the end faces of the valve cylinder; the valve wings are open at the top and bottom and hollow inside in a V-shaped shape, and their cross-section is V-shaped, and one side of the small end is closed, and one side of the large end is open and integrally connected to the outer side of the valve cylinder, and its opening gradually increases from the direction away from the valve cylinder to the direction close to the valve cylinder. The central shaft 4 is installed in the inner cavity of the valve cylinder.

[0044] In addition, the housing 28 is sealed by connecting the cooling furnace section flange, and the flapper valve body 5 is in the middle to adjust the rotation angle. The flapper valve body 5 is installed with a central shaft 4, and the top of the central shaft 4 is connected to the V-shaped crank 12. The roller 10 at the end of the connecting rod 11 is in tangential line contact with the inner wall of the U-shaped limit plate 9. The U-shaped limit plate 9 is driven to translate by the extension and contraction of the piston rod on the driver 7, so that the valve angle amplitude of 0 to 90° is controlled by the rotation of the V-shaped crank 12 under the control of the precise stroke of the driver 7. This structure can not only respond to the action quickly, but also achieve the effect of accurately controlling the opening and closing angle of the flapper valve body 5, meeting the requirements of controlling the furnace temperature of the cooling furnace section.

[0045] The working principle of the device is:

[0046] When the driver 7 is started, the piston rod at one end of the driver 7 drives the U-shaped limit plate 9 to move linearly, thereby driving the connecting rod 11, the V-shaped crank 12 and the connecting head 13 connected in sequence to rotate, and at the same time drives the roller 10 connected thereto to roll on the inner wall of the U-shaped groove, thereby driving the central axis 4 and the baffle valve body 5 connected thereto to rotate a certain angle in the air duct of the shell 28, thereby realizing rapid adjustment and precise control of the opening and closing of the air duct.

[0047] In summary, the present device is connected to the crank transmission structure 3 through the top end of the baffle valve body 5, and the top end of the crank transmission structure 3 can be arranged in the U-shaped groove in a rolling and translational manner along the inner wall of the U-shaped groove of the U-shaped guide bracket 2, so that when the U-shaped guide bracket 2 moves linearly on the guide rail 6, it can drive the crank transmission structure 3 to slide and translate on the inner wall of the U-shaped groove while rotating, and then drive the central shaft 4 connected thereto to rotate by controlling the rotation of the crank transmission structure 3, thereby driving the baffle valve body 5 to rotate and complete the opening and closing process of the entire baffle valve of the air duct of the fast cooling section; therefore, it can not only quickly respond to the action of opening and closing the air duct, but also accurately adjust the opening and closing angle of the baffle valve body 5 to meet the requirements of controlling the furnace temperature of the cooling furnace section. This design has a compact structure, and the housing 28 and the baffle valve body 5 occupy a small area, and can be embedded in the air duct box to implement rapid adjustment of the air duct. Moreover, the structure is easy to disassemble and assemble, and is also easy to inspect and maintain; the driver 7 is installed on the external support frame 1, which is convenient for inspection and replacement. At the same time, the structure has a long service life, the structural design is reliable and durable, and the baffle valve body 5 and the like are all made of carbon steel. If the harsh working conditions are considered, heat-resistant materials such as stainless steel can also be used internally. At the same time, the bearing has a large load-bearing strength, and a lubricating oil cup 22 is provided for regular lubrication. The strength and rigidity of the V-crank 12, the piston rod of the driver 7, and the baffle valve body 5 are all large, and can bear a large wind pressure and complete the work. In addition, the structure has high adjustment accuracy. It controls the piston rod stroke and the angle of the baffle valve body 5 with high precision through the driver 7, and flexibly controls the degree of the angle with the existing electrical automation PLC program, so as to quickly control the cooling speed. Furthermore, the structure is simple to maintain, and the baffle valve body 5 is connected to the center shaft 4 by bolts, nuts, and washers. The center shaft 4 can be connected first, and then installed according to the hole position of the baffle valve body 5 corresponding to the hole of the center shaft 4.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fast cooling section air duct baffle valve, characterized in that: It includes a support frame, a U-shaped guide frame, a crank transmission structure, a central shaft and a baffle valve body; the U-shaped guide frame can be arranged on the guide rail of the support frame for linear reciprocating movement; one end of the crank transmission structure can be arranged in the U-shaped groove in a rolling and translational manner along the inner wall of the U-shaped groove of the U-shaped guide frame, and the other end is transmission-connected to the top end of the central shaft to drive the central shaft to rotate in the air duct of the shell of the fast cooling section; the central shaft is rotatably arranged in the air duct of the shell; the baffle valve body is sleeved on the central shaft and rotatably arranged in the air duct of the shell to open or close the air duct.

2. The fast cooling section air duct baffle valve according to claim 1, characterized in that: It also includes a driver, one end of which is drivingly connected to the outer wall of the U-shaped guide bracket and is used to drive the U-shaped guide bracket to perform linear reciprocating movement on the guide rail.

3. The fast cooling section air duct baffle valve according to claim 2, characterized in that: The driver comprises a bidirectional air cylinder or a double-head electric cylinder.

4. The fast cooling section air duct baffle valve according to claim 1, characterized in that: The U-shaped guide bracket includes a sliding guide plate and a U-shaped limiting plate; the sliding guide plate can be arranged on the guide rail for linear reciprocating movement; the top end of the U-shaped limiting plate is installed on the bottom end of the sliding guide plate, and the opening direction is perpendicular to the moving direction of the U-shaped guide bracket; the U-shaped limiting plate is arranged to form the U-shaped groove.

5. The fast cooling section air duct baffle valve according to claim 4, characterized in that: The U-shaped limiting plate comprises a first straight plate, a U-shaped connecting plate and a second straight plate which are connected in sequence.

6. The fast cooling section air duct baffle valve according to claim 1, characterized in that: The crank transmission structure includes a roller, a connecting rod, a V-crank and a connecting head; the roller is rotatably mounted on the top end of the connecting rod and is rollably disposed on the inner wall of the U-shaped groove; the connecting rod is vertically disposed in the U-shaped cavity of the U-shaped groove, and the bottom end extends out of the U-shaped cavity and is vertically connected to one end of the V-crank; the V-crank is horizontally disposed, and the other end is vertically connected to the side wall of the connecting head; the connecting head is sleeved on the top end of the central shaft to drive the central shaft to rotate.

7. The fast cooling section air duct baffle valve according to claim 1, characterized in that: It also includes an upper shaft head; the upper shaft head is installed on the upper sleeve on the top of the shell body and is sleeved on the upper end of the central shaft.

8. The fast cooling section air duct baffle valve according to claim 7, characterized in that: The upper shaft head includes an upper joint bearing, two sealing rings, a retaining ring and a retaining ring; the upper joint bearing is installed on the inner circumferential wall of the upper sleeve at the top of the shell, and is sleeved on the upper end of the center shaft; one of the sealing rings, the retaining ring, the other sealing ring and the retaining ring are sleeved on the upper end of the center shaft from bottom to top in sequence, and are all clamped on the inner circumferential wall of the upper cover at the top of the shell; the upper cover is installed on the top of the upper sleeve through a gasket, and the upper cover, the gasket and the upper sleeve are connected in sequence by bolts; an oil cup for injecting lubricating oil is provided on the side wall of the upper cover.

9. The fast cooling section air duct baffle valve according to claim 1, characterized in that: It also includes a lower shaft head; the lower shaft head is installed on the lower sleeve at the bottom of the shell body and sleeved on the lower end of the central shaft.

10. The fast cooling section air duct baffle valve according to claim 9, characterized in that: The lower shaft head includes a lower joint bearing, a ball bearing and a flat washer; the ball bearing, the flat washer and the lower joint bearing are sequentially sleeved on the lower end of the central shaft from top to bottom, and the lower joint bearing is installed on the inner circumferential wall of the lower sleeve at the bottom of the shell; the lower cover at the bottom of the shell is installed on the bottom of the lower sleeve through a gasket, and the lower cover, the gasket and the lower sleeve are sequentially connected by bolts.

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