Rotary drum type hot rolling flying shear with cooling device

Abstract

The utility model discloses a drum type hot rolling flying shear with a cooling device, which comprises a flying shear frame, an upper drum and a lower drum, the upper drum and the lower drum are arranged on the flying shear frame, shear blade mounting grooves are symmetrically arranged on the upper drum and the lower drum, a shear blade locking cylinder is mounted on the lower portion of each shear blade mounting groove, and a locking block is arranged at the front end of each shear blade locking cylinder. The upper part of each shear blade mounting groove is provided with a lining plate, an L-shaped liner, and an upper drum head cutting shear blade, a lower drum head cutting shear blade, an upper drum tail cutting shear blade and a lower drum tail cutting shear blade which are matched with the L-shaped liner, and each shear blade is locked through a corresponding locking block; a spray pipe is arranged on the flying shear rack and located at the position of the lower rotary drum, and fan-shaped nozzles facing the two sides of the lower rotary drum are arranged at the two ends of the spray pipe respectively. By means of the cooling device, the positions of the head and tail cutting shear blades on the rotary drum can be exchanged, when the shear blades are in the waiting position, the surface of the flying shear lower rotary drum close to the hot-rolled steel is cooled, the service life of the rotary drum is prolonged, and shearing stability is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of drum flying shears, and relates to a drum-type hot rolling flying shear with a cooling device. Background Art

[0002] A shearing machine for laterally shearing a rolled piece during operation is called a flying shear, which is an important device for steel enterprises to shear metal billets. The drum flying shear is a common structure form of the flying shear. The drum flying shear body mainly consists of a frame assembly, a drum, a synchronous gear assembly, and a shear blade locking device. Figure 8 The assembly schematic diagram (cutting head state) of the upper drum 1' and the lower drum 2' in a traditional drum flying shear is shown. The upper drum 1' and the lower drum 2' are both symmetrically provided with shear blade mounting grooves with an "L"-shaped cross-section at the center. Shear blade locking cylinders 7' are respectively installed at the lower parts of the shear blade mounting grooves. A locking block 8' is provided at the front end of the shear blade locking cylinder 7'. The upper side walls of the upper parts of the shear blade mounting grooves are respectively installed with corresponding first liners 201', first L-shaped liners 901', second liners 202', second L-shaped liners 902', third liners 203', third L-shaped liners 903', fourth liners 204', and fourth L-shaped liners 904'. Upper drum cutting head shear blades 3', lower drum cutting head shear blades 4', upper drum cutting tail shear blades 5', and lower drum cutting tail shear blades 6' are respectively and correspondingly installed on the first L-shaped liners 901', second L-shaped liners 902', third L-shaped liners 903', and fourth L-shaped liners 904' and are locked by the corresponding locking blocks 8'. During the working process of this flying shear, due to the very high temperature of the hot-rolled steel plate, it will have a certain degree of high-temperature effect on the lower drum, which is equivalent to local heat treatment, and will cause the metallographic structure of the metal at this part of the lower drum to change, which will affect the performance of the drum to a certain extent and reduce the service life of the drum. In addition, at present, according to the production process requirements of the drum-type flying shear, different shear blade clearances are required during the flying shear cutting head and cutting tail operations. The cutting head shear blade clearance is 3.2 - 3.6 mm, and the cutting tail shear blade clearance is 2.4 - 2.8 mm. Figure 8The schematic diagram shows the state of the cutting head of the traditional flying shear blade. The state of the cutting tail is similar to that of the cutting head. Just adjust the working positions of the upper drum 1' and the lower drum 2' so that the cutting head shear blade 4' of the lower drum is opposite to the cutting tail shear blade 6' of the lower drum. The thicknesses of the first L-shaped gasket 901', the second L-shaped gasket 902', the third L-shaped gasket 903' and the fourth L-shaped gasket 904' on the upper drum 1' and the lower drum 2' of this traditional flying shear are the same. To achieve the shear blade clearance in the cutting head and cutting tail states, during the production and assembly of this drum-type flying shear, by grinding the thicknesses of the first lining plate 201', the second lining plate 202', the third lining plate 203' and the fourth lining plate 204', the shear blade clearances in the cutting head state and the cutting tail state are adjusted respectively. After adjustment, marks are made on the first lining plate 201', the second lining plate 202', the third lining plate 203' and the fourth lining plate 204'. At the same time, the bonding surfaces of each lining plate and the shear blade installation groove of the drum are coated with glue, which is not convenient for disassembly. Therefore, each of the grinded lining plates can only be used at the corresponding positions on the upper drum 1' and the lower drum 2', and cannot be replaced to other shear blade installation grooves. As a result, the cutting head shear blade and the cutting tail shear blade can only be installed at specific positions on the upper and lower drums, and the working positions of the upper and lower drums cannot be changed. The high temperature and shearing force of the strip always act on the fixed side of the drum, which will weaken the stability of the drum and affect the service life of the drum. Summary of the Invention

[0003] In view of the technical problem in the background art that the high temperature of the hot-rolled steel plate during shearing will affect the performance of the lower drum, the present invention provides a hot-rolled flying shear with a cooling device.

[0004] The technical solution for the present invention to solve the technical problem is as follows:

[0005] A drum-type hot-rolled flying shear with a cooling device according to the present invention includes a flying shear frame and an upper drum and a lower drum arranged up and down on the flying shear frame. The upper drum is provided with an upper drum cutting head shear blade and an upper drum cutting tail shear blade. The lower drum is provided with a lower drum cutting head shear blade and a lower drum cutting tail shear blade corresponding to the upper drum cutting head shear blade and the upper drum cutting tail shear blade respectively. The cooling device is arranged on the flying shear frame and includes a spray pipe arranged at the position of the lower drum on the flying shear frame. Sector nozzles facing both sides of the lower drum are respectively arranged at both ends of the spray pipe.

[0006] Furthermore, a nozzle protection frame is arranged outside the sector nozzle, and the nozzle protection frame is fixedly connected to the flying shear frame.

[0007] Furthermore, the sector nozzle is connected to the spray pipe through a spherical joint.

[0008] Furthermore, a prefabricated pipe is connected to the spray pipe, a ball valve is arranged on the prefabricated pipe, and the prefabricated pipe is connected to a water source.

[0009] Furthermore, the installation height of the sector nozzle is lower than the top height of the lower drum, and the spraying range of each sector nozzle is at least half of the length of the lower drum.

[0010] Furthermore, symmetrically centered on the upper drum and the lower drum are provided shear blade mounting grooves with the same specifications and a cross-section in the shape of "L". Locking cylinders for shear blades are respectively installed at the lower parts of the shear blade mounting grooves. Locking blocks are provided at the front ends of the locking cylinders for shear blades. Corresponding first lining plates and first L-shaped liners, as well as third lining plates and third L-shaped liners, are respectively provided at the upper parts of the two shear blade mounting grooves of the upper drum. Corresponding second lining plates and second L-shaped liners, as well as fourth lining plates and fourth L-shaped liners, are respectively provided at the upper parts of the two shear blade mounting grooves of the lower drum. The upper drum head cutting shear blades, the lower drum head cutting shear blades, the upper drum tail cutting shear blades, and the lower drum tail cutting shear blades are respectively arranged on the first L-shaped liners, the second L-shaped liners, the third L-shaped liners, and the fourth L-shaped liners and are respectively locked by the corresponding locking blocks.

[0011] Furthermore, let the gap between the upper drum head cutting shear blade and the lower drum head cutting shear blade in the head cutting state of the drum-type hot rolling flying shear be d1, and let the gap between the upper drum tail cutting shear blade and the lower drum tail cutting shear blade in the tail cutting state of the drum-type hot rolling flying shear be d2. The first lining plate, the second lining plate, the third lining plate, and the fourth lining plate have the same specifications. The first L-shaped liner and the upper drum head cutting shear blade, the second L-shaped liner and the lower drum head cutting shear blade, the third L-shaped liner and the upper drum tail cutting shear blade, and the fourth L-shaped liner and the lower drum tail cutting shear blade are respectively installed in a matching manner at the upper parts of the shear blade mounting grooves provided on the upper drum and the lower drum. The thickness specifications of the first L-shaped liner, the second L-shaped liner, the third L-shaped liner, and the fourth L-shaped liner satisfy the shear blade gaps d1 and d2 in the head cutting state and the tail cutting state of the drum-type hot rolling flying shear.

[0012] Furthermore, d1 is 3.2 - 3.6 mm, and d2 is 2.4 - 2.8 mm.

[0013] Furthermore, the first L-shaped liner and the upper drum head cutting shear blade, as well as the third L-shaped liner and the upper drum tail cutting shear blade used in a matching manner on the upper drum can be respectively installed interchangeably at the upper parts of the shear blade mounting grooves of each other; the second L-shaped liner and the lower drum head cutting shear blade, as well as the fourth L-shaped liner and the lower drum tail cutting shear blade used in a matching manner on the lower drum can be respectively installed interchangeably at the upper parts of the shear blade mounting grooves of each other.

[0014] Compared with the prior art, the drum-type hot-rolling flying shear with a cooling device provided by the present utility model has a novel and reasonable design, a simple structure, is easy to implement, has a low manufacturing cost, and good effects. By arranging a spray pipe and a fan-shaped nozzle at the position of the lower drum, the surface of the lower drum of the flying shear near the hot-rolled steel can be cooled when the shear blade is in the waiting position, thereby prolonging the service life of the drum and ensuring the shearing stability; the fan-shaped nozzle is connected to the spray pipe through a spherical joint, which is convenient for adjusting the spraying angle of the fan-shaped nozzle; by arranging a nozzle protection frame outside the fan-shaped nozzle, the hot-rolled steel during rolling can be prevented from touching the fan-shaped nozzle; by symmetrically opening shear blade installation grooves at the centers of the upper drum and the lower drum and installing shear blade locking cylinders, lining plates, L-shaped liners and each head-cutting and tail-cutting shear blade, the thickness of the lining plate is kept unchanged, the L-shaped liners and the corresponding head-cutting and tail-cutting shear blades are used in a matching manner to form a pairing relationship, and the gap of the shear blade in the head-cutting and tail-cutting states is realized through the thickness of the L-shaped liner, so that the positions of the head-cutting and tail-cutting shear blades and the corresponding L-shaped liners on the upper and lower drums can be interchanged. Furthermore, the other side of the drum can withstand the influence of high temperature and the acting forces in different shearing states, increasing the stability of the upper and lower drums, prolonging the service life of the drum, and also increasing the flexibility of the use position of the shear blade and reducing the fitting difficulty of adjusting the shear blade gap of the drum-type flying shear. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a side view of the drum-type hot-rolling flying shear with a cooling device according to the present utility model;

[0016] Figure 2 is a front view of the drum-type hot-rolling flying shear with a cooling device according to the present utility model;

[0017] Figure 3 is a plan view of the drum-type hot-rolling flying shear with a cooling device according to the present utility model;

[0018] Figure 4 is a schematic view of the assembly of the upper drum and the lower drum of the present utility model;

[0019] Figure 5 is a schematic view of the structures of the upper drum and the lower drum of the present utility model and their states when they are respectively in the waiting positions of head-cutting and tail-cutting;

[0020] Figure 6 is a schematic view of the states of the initial head-cutting and tail-cutting of the drum-type hot-rolling flying shear of the present utility model;

[0021] Figure 7 is a schematic view of the states of head-cutting and tail-cutting after the installation positions of the head-cutting shear blade and the tail-cutting shear blade of the upper drum and the corresponding L-shaped liners, the head-cutting shear blade and the tail-cutting shear blade of the lower drum and the corresponding L-shaped liners of the present utility model are interchanged;

[0022] Figure 8Schematic diagram of the assembly of the upper drum and the lower drum on a traditional flying shear (cutting head state);

[0023] Figures 1-7 In the figure: 1. Upper drum; 2. Lower drum; 3. Upper drum cutting head shear blade; 4. Lower drum cutting head shear blade; 5. Upper drum cutting tail shear blade; 6. Lower drum cutting tail shear blade; 7. Shear blade locking cylinder; 8. Locking block; 901. First L-shaped gasket; 902. Second L-shaped gasket; 903. Third L-shaped gasket; 904. Fourth L-shaped gasket; 201. First lining plate; 202. Second lining plate; 203. Third lining plate; 204. Fourth lining plate; 10. Prefabricated pipe; 11. Ball valve; 12. Spray pipe; 13. Sector nozzle; 14. Nozzle protection frame; 15. Flying shear frame;

[0024] Figure 8 In the figure: 1’. Upper drum; 2’. Lower drum; 3’. Upper drum cutting head shear blade; 4’. Lower drum cutting head shear blade; 5’. Upper drum cutting tail shear blade; 6’. Lower drum cutting tail shear blade; 7’. Shear blade locking cylinder; 8’. Locking block; 901’. First L-shaped gasket; 902’. Second L-shaped gasket; 903’. Third L-shaped gasket; 904’. Fourth L-shaped gasket; 201’. First lining plate; 202’. Second lining plate; 203’. Third lining plate; 204’. Fourth lining plate. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the technical field to which this disclosure belongs. The "upper", "lower", "left", "right", "front", "rear", "inside", "outside", etc. used in the specification and claims of this patent application of the present disclosure are only used to represent relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly. Those parts not detailed in the present utility model are all well-known technologies in the technical field.

[0026] Embodiment 1:

[0027] As Figures 1-5As shown in the figure, a drum-type hot rolling flying shear with a cooling device according to the present utility model includes a flying shear frame 15, an upper drum 1 and a lower drum 2 which are arranged up and down on the flying shear frame 15. An upper drum head cutting blade 3 and an upper drum tail cutting blade 5 are arranged on the upper drum 1. A lower drum head cutting blade 4 and a lower drum tail cutting blade 6 which correspond to the upper drum head cutting blade 3 and the upper drum tail cutting blade 5 respectively are arranged on the lower drum 2. By rotating the upper drum 1 and the lower drum 2, the upper drum head cutting blade 3 and the lower drum head cutting blade 4 are made to correspond to each other, or the upper drum tail cutting blade 5 and the lower drum tail cutting blade 6 are made to correspond to each other, so as to realize the cutting of the head and tail of hot-rolled steel. In order to cool the lower drum 2, a cooling device is added at the position of the lower drum 2. The cooling device is arranged on the flying shear frame 15 and includes a spray pipe 12 arranged at the position of the lower drum 2 on the flying shear frame 15. Sector nozzles 13 facing both sides of the lower drum 2 are respectively arranged at both ends of the spray pipe 12 for spraying cooling water onto the lower drum 2.

[0028] In this embodiment, a nozzle protection frame 14 can also be arranged outside the sector nozzle 13. The nozzle protection frame 14 is fixedly connected to the flying shear frame 15, and the sector nozzle 13 is effectively protected by the nozzle protection frame 14 from being collided by the hot-rolled steel above.

[0029] In this embodiment, the installation height of the sector nozzle 13 is lower than the top height of the lower drum 2 to avoid the cooling water being sprayed onto the hot-rolled steel and affecting the surface quality of the steel. The spraying range of each sector nozzle 13 is at least half of the length of the lower drum 2, so as to cool the lower drum 2 during operation.

[0030] In this embodiment, the sector nozzle 13 can be connected to the spray pipe 12 through a ball joint to facilitate the adjustment of the direction of the sector nozzle 13.

[0031] In this embodiment, a prefabricated pipe 10 is connected to the spray pipe 12. A ball valve 11 is arranged on the prefabricated pipe 10. The prefabricated pipe 10 is connected to a water source, and the on-off of the cooling water in the prefabricated pipe 10 is controlled by the ball valve.

[0032] During application, after the drum flying shear operates, the ball valve 11 is opened, and the cooling water enters the prefabricated pipe 10 and the spray pipe 12, and then sprays out from the sector nozzle 13 to cool the surface temperature of the lower drum 2 on the entrance side of the flying shear.

[0033] Embodiment 2:

[0034] As Figures 1-7As shown in the figure, on the basis of Embodiment 1, for a drum-type hot rolling flying shear with a cooling device of the present utility model, shear blade mounting grooves with the same specifications and a cross-section in the shape of "L" are symmetrically arranged at the centers on both the upper drum 1 and the lower drum 2. Shear blade locking cylinders 7 are respectively installed at the lower parts of the shear blade mounting grooves. Locking blocks 8 are provided at the front ends of the shear blade locking cylinders 7. Corresponding first liners 201 and first L-shaped liners 901, as well as third liners 203 and third L-shaped liners 903, are respectively arranged at the upper parts of the two shear blade mounting grooves of the upper drum 1. Corresponding second liners 202 and second L-shaped liners 902, as well as fourth liners 204 and fourth L-shaped liners 904, are respectively arranged at the upper parts of the two shear blade mounting grooves of the lower drum 2. The upper drum head-cutting shear blade 3, the lower drum head-cutting shear blade 4, the upper drum tail-cutting shear blade 5, and the lower drum tail-cutting shear blade 6 are respectively arranged on the first L-shaped liner 901, the second L-shaped liner 902, the third L-shaped liner 903, and the fourth L-shaped liner 904 and are respectively locked by the corresponding locking blocks 8. In this embodiment, by symmetrically arranging at the centers on the upper drum 1 and the lower drum 2 shear blade mounting grooves with the same specifications and a cross-section in the shape of "L", and by installing shear blade locking cylinders 7 at the lower parts of the shear blade mounting grooves and installing liners and L-shaped liners at the upper parts respectively, it is very convenient for the installation of the head-cutting and tail-cutting shear blades and also provides conditions for the subsequent interchange of the positions of the head-cutting shear blade and the tail-cutting shear blade.

[0035] In this embodiment, during the head-cutting and tail-cutting operations of the drum-type hot rolling flying shear, different shear blade clearances usually exist. As Figure 6 shown in the schematic diagram of the flying shear in the initial head-cutting and tail-cutting states, let the clearance between the upper drum head-cutting shear blade 3 and the lower drum head-cutting shear blade 4 in the head-cutting state of the drum-type hot rolling flying shear be d1, and d1 is generally 3.2 - 3.6 mm. Let the clearance between the upper drum tail-cutting shear blade 5 and the lower drum tail-cutting shear blade 6 in the tail-cutting state of the drum-type hot rolling flying shear be d2, and d2 is generally 2.4 - 2.8 mm. In this embodiment, the first liner 201, the second liner 202, the third liner 203, and the fourth liner 204 have the same specifications. The first L-shaped liner 901 and the upper drum head-cutting shear blade 3, the second L-shaped liner 902 and the lower drum head-cutting shear blade 4, the third L-shaped liner 903 and the upper drum tail-cutting shear blade 5, and the fourth L-shaped liner 904 and the lower drum tail-cutting shear blade 6 are respectively installed in a matching manner at the upper parts of the shear blade mounting grooves opened on the upper drum 1 and the lower drum 2. The thickness specifications of the first L-shaped liner 901, the second L-shaped liner 902, the third L-shaped liner 903, and the fourth L-shaped liner 904 are determined by the two clearance values d1 and d2 and are processed and manufactured, so that after the installation of each head-cutting shear blade and tail-cutting shear blade, the shear blade clearances d1 and d2 of the drum-type hot rolling flying shear in the head-cutting state and the tail-cutting state are satisfied.

[0036] In this embodiment, to avoid the long-term trimming operation always acting on the same position of the upper and lower drums, since the specifications of each shear blade mounting groove, shear blade locking cylinder 7 and each lining plate on the upper and lower drums are the same, the thicknesses of the first L-shaped gasket 901, the second L-shaped gasket 902, the third L-shaped gasket 903 and the fourth L-shaped gasket 904 are different, and each L-shaped gasket is used in combination with the corresponding shear blade. Therefore, the first L-shaped gasket 901 used in combination with the upper drum 1 and the upper drum head-cutting shear blade 3 and the third L-shaped gasket 903 and the upper drum tail-cutting shear blade 5 can be interchangeably installed at the upper part of the shear blade mounting groove of each other; the second L-shaped gasket 902 used in combination with the lower drum 2 and the lower drum head-cutting shear blade 4 and the fourth L-shaped gasket 904 and the lower drum tail-cutting shear blade 6 can be interchangeably installed at the upper part of the shear blade mounting groove of each other. After the shear blades are interchanged in position, each shear blade is locked by the locking block 8 of the shear blade locking cylinder 7 in the shear blade mounting groove. This not only increases the flexibility of the shear blade use position but also reduces the fitting difficulty of adjusting the shear blade clearance of the drum flying shear. After the above shear blades are interchanged in position, the working positions of the upper and lower drums are adjusted by 180° to perform the head-cutting and tail-cutting operations. In Figure 6 and Figure 7 , the red triangles are the triangular marks of the upper and lower drums. As can be seen from the two figures, after the shear blade positions are interchanged and the working positions of the drums are adjusted by 180°, the other side of the drums can bear the influence of high temperature and the acting forces in different shearing states, which can improve the working performance and service life of the drums to a certain extent.

Claims

1. A rotary drum hot rolling flying shear with a cooling device, comprising a flying shear frame (15) and an upper drum (1) and a lower drum (2) arranged on the flying shear frame (15) in a vertical direction, wherein the upper drum (1) is provided with an upper drum head cutting shear blade (3) and an upper drum tail cutting shear blade (5), and the lower drum (2) is provided with a lower drum head cutting shear blade (4) and a lower drum tail cutting shear blade (6) corresponding to the upper drum head cutting shear blade (3) and the upper drum tail cutting shear blade (5), respectively, wherein: The cooling device is arranged on a shear frame (15), and comprises a nozzle (12) arranged on the shear frame (15) at the position of the lower drum (2), and fan-shaped nozzles (13) facing both sides of the lower drum (2) are respectively arranged at both ends of the nozzle (12).

2. The rotary drum hot rolling flying shear with a cooling device according to claim 1, characterized in that: A nozzle protection frame (14) is provided on the outside of the fan-shaped nozzle (13), and the nozzle protection frame (14) is fixedly connected to the shear frame (15).

3. The rotary drum hot rolling flying shear with a cooling device according to claim 1, characterized in that: The fan-shaped nozzle (13) is connected to the nozzle (12) via a spherical joint.

4. The rotary drum hot rolling flying shear with a cooling device according to claim 1, characterized in that: The nozzle (12) is connected to a prefabricated pipe (10), a ball valve (11) is provided on the prefabricated pipe (10), and the prefabricated pipe (10) is connected to a water source.

5. The rotary drum hot rolling flying shear with a cooling device according to claim 1, characterized in that: The installation height of the fan-shaped nozzles (13) is lower than the top height of the lower drum (2), and the spraying range of each fan-shaped nozzle (13) is at least half the length of the lower drum (2).

6. A rotary drum hot rolling flying shear with a cooling device according to any one of claims 1 to 5, characterized in that: The upper drum (1) and the lower drum (2) are both centrally symmetrically provided with shear blade mounting grooves of the same specification and L-shaped cross-section, a shear blade locking cylinder (7) is respectively installed at the lower portion of each shear blade mounting groove, and a locking block (8) is provided at the front end of each shear blade locking cylinder (7), the upper portions of the two shear blade mounting grooves of the upper drum (1) are respectively provided with corresponding first lining plates (201) and first L-shaped gaskets (901) and third lining plates (203) and third L-shaped gaskets (903), the upper portions of the two shear blade mounting grooves of the lower drum (2) are respectively provided with corresponding first lining plates (201) and first L-shaped gaskets (901) and third lining plates (203) and third L-shaped gaskets (903). The upper portion of the shear blade installation groove is provided with a corresponding second lining plate (202) and a second L-shaped gasket (902) and a fourth lining plate (204) and a fourth L-shaped gasket (904), respectively. The upper drum head cutting shear blade (3), the lower drum head cutting shear blade (4), the upper drum tail cutting shear blade (5) and the lower drum tail cutting shear blade (6) are respectively provided on the first L-shaped gasket (901), the second L-shaped gasket (902), the third L-shaped gasket (903) and the fourth L-shaped gasket (904) and are respectively locked by corresponding locking blocks (8).

7. The rotary drum hot rolling flying shear with a cooling device according to claim 6, characterized in that: Assuming that the gap between the upper drum shearing blade (3) and the lower drum shearing blade (4) in the rotary drum hot rolling flying shearing state is d1, and the gap between the upper drum shearing blade (5) and the lower drum shearing blade (6) in the rotary drum hot rolling flying shearing state is d2, the first lining plate (201), the second lining plate (202), the third lining plate (203) and the fourth lining plate (204) have the same specifications, the first L-shaped liner (901) and the upper drum shearing blade (3), the second L-shaped liner (902) and the lower drum shearing blade The shear blade (4), the third L-shaped pad (903) and the upper drum tail cutting shear blade (5), as well as the fourth L-shaped pad (904) and the lower drum tail cutting shear blade (6) are respectively mounted on the upper portion of the shear blade mounting grooves provided on the upper drum (1) and the lower drum (2). The thickness specifications of the first L-shaped pad (901), the second L-shaped pad (902), the third L-shaped pad (903) and the fourth L-shaped pad (904) meet the shear blade gaps d1 and d2 of the rotary drum hot rolling flying shear in the head cutting state and the tail cutting state.

8. The rotary drum hot rolling flying shear with a cooling device according to claim 7, characterized in that: The d1 is 3.2-3.6 mm, and the d2 is 2.4-2.8 mm.

9. The rotary drum hot rolling flying shear with a cooling device according to claim 7, characterized in that: The first L-shaped pad (901) and the upper drum head cutting shear blade (3) used in conjunction with the third L-shaped pad (903) and the upper drum tail cutting shear blade (5) used in conjunction with the upper drum (1) can be interchangeably installed on the upper portion of each other's shear blade mounting groove; the second L-shaped pad (902) and the lower drum head cutting shear blade (4) used in conjunction with the fourth L-shaped pad (904) and the lower drum tail cutting shear blade (6) used in conjunction with the lower drum (2) can be interchangeably installed on the upper portion of each other's shear blade mounting groove.

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