Diversion trench of circle shear and circle shear

Abstract

The invention provides a circle shear diversion trench and a circle shear. The circle shear diversion trench comprises a connecting seat suitable for being connected with an external rack; the diversion trench main body is fixedly connected with the connecting seat; the diversion trench main body comprises a top wall plate, a side wall plate and a bottom wall plate which are connected with one another, and vent holes distributed in an array are formed in the top wall plate; the inner blowing device is suitable for blowing airflow into the diversion trench main body; the inner blowing device is positioned at the downstream end of the strip steel relative to the vent hole; the inner blowing device comprises an inner blower main body, an inner blower gasket and a first blowing seam; the first air blowing seam is formed in the top wall plate and penetrates through the top wall plate, and the width of the first air blowing seam is 1-2 mm; the inner blower body is located on the upper surface of the top wall plate and communicates with the first blowing seam, and the inner blower gasket is arranged between the inner blower body and the top wall plate. The device overcomes the defect that in the prior art, when a circle shear diversion trench guides a sideband, the sideband running resistance is easily increased, and then the sideband flies out of the diversion trench.

Description

Technical Field

[0001] The invention relates to the technical field of strip steel manufacturing equipment, and in particular to a disc shear guide groove and a disc shear. Background Art

[0002] The circular shear is a device that uses at least one pair of circular cutters with their ends aligned and staggered in the axial direction for shearing. Because the circular cutters can rotate continuously, they can shear continuously, and are particularly suitable for longitudinal shearing of moving plates or strips. Therefore, in the cold-rolled strip slitting and rewinding production line, it is mainly used for strip trimming. A pair of circular shears are symmetrically set on both sides of the strip to trim the strip edge, ensure the straightness of the strip edge, and make the strip reach the predetermined width size. The sheared edge strip needs a guide trough to change its movement direction and guide it into the scrap hopper.

[0003] Because the disc cutter is a high-speed moving part and the guide groove is a stationary part, a certain gap must be left between the two during installation to avoid accidental collisions. The thickness of the sideband is generally 0.1~0.5mm and the width is no more than 10mm. It is a material that lacks sufficient rigidity and is more prone to deformation. During the guiding process, the sideband is easy to rub against the inner wall of the guide groove, thereby increasing its movement resistance. Once the travel resistance at the downstream end of the sideband is large, its upstream end is easy to bend or deflect, which may cause the sideband to emerge from the gap between the guide groove and the disc cutter, and then fly out of the guide groove driven by the high-speed running disc cutter, which not only causes the sideband to deviate from the predetermined guide path, but also easily causes tool jamming and other faults. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the disc shear guide groove in the prior art that the side band is easily increased in running resistance when guiding the side band, thereby causing the side band to fly out of the guide groove.

[0005] In order to solve the above technical problems, the present application provides a disc shear guide groove, comprising: A connecting seat, suitable for connecting with an external rack; The guide trough body is suitable for guiding the side strip cut from the strip steel and is fixedly connected to the connecting seat; the guide trough body comprises a top wall plate, a side wall plate and a bottom wall plate connected to each other, and the top wall plate is provided with long strip-shaped vents distributed side by side; the vents are arranged along the length direction of the guide trough body; The internal blowing device is suitable for blowing air flow into the interior of the guide groove body; the internal blowing device is located at the downstream end of the strip relative to the air vent; the internal blowing device includes an internal blower body, an internal blower gasket and a first blowing seam; the first blowing seam is opened on the top wall plate and passes through the top wall plate, and the width of the first blowing seam is 1~2mm; the internal blower body is located on the upper surface of the top wall plate and is connected to the first blowing seam, and the internal blower gasket is arranged between the internal blower body and the top wall plate.

[0006] Furthermore, the cross section of the guide trough body is a C-shaped semi-enclosed structure, and the side opening of the guide trough body faces the side where the strip steel is located.

[0007] Furthermore, the shear edge of the strip is projected onto the top wall plate as a shear projection line; the first air blowing seam and the shear projection line are obliquely intersected; the upstream end of the first air blowing seam is close to the side where the strip is located, and the other end of the first air blowing seam is away from the side where the strip is located.

[0008] Furthermore, the angle between the first blowing seam and the shear projection line is β, and β≤20°.

[0009] Furthermore, the top wall plate is divided into an inner area and an outer area by a shear projection line, the inner area is located on the side away from the strip relative to the outer area; the ventilation holes are only arranged in the inner area, and the first blowing seam is continuously arranged in the inner area and the outer area.

[0010] Furthermore, the inner blower body has a structure with one end being large and the other end being small; the large end of the inner blower body is located at the downstream end of the strip relative to the small end; and an inner blower joint is provided at the large end of the inner blower body.

[0011] Furthermore, an external blowing device is provided at the downstream end of the top wall plate; the external blowing device is suitable for blowing airflow toward the downstream direction of the top wall plate.

[0012] Furthermore, the external blowing device includes an external blower body and an external blower gasket; the external blower body is located on the upper surface of the top wall plate, and the external blower gasket is arranged between the external blower body and the top wall plate; the external blower gasket is a C-shaped semi-enclosed structure, and the side opening of the external blower gasket, the bottom surface of the external blower body and the upper surface of the top wall plate jointly form a second blowing gap, and the second blowing gap is facing the downstream direction of the top wall plate.

[0013] Furthermore, when viewed from the side, the angle between the top wall plate and the moving direction of the strip is α. ; Where ρ is the density of the sideband (g / m 3 ), g is the acceleration due to gravity (m / s 2), δ is the thickness of the sideband (mm), w is the width of the sideband (mm), and v is the running speed of the sideband (m / min).

[0014] A disc shear, comprising: frame; A disc cutter, arranged on the frame and suitable for shearing the strip steel; The aforementioned disc shear guide groove is located downstream of the disc cutter; the connecting seat is connected to the frame.

[0015] By adopting the above technical solution, the present invention has the following technical effects: The disc shear guide groove provided by the present invention can form an open structure on the top wall plate by providing long strip-shaped vents. Even if the side band and the top wall plate are fitted together under the inertial force, the fitting surface of the side band can drive the air in the long strip-shaped vents, thereby forming an air pressure that reduces the pressure on the other side, thereby reducing the friction of the side band. The reason why the vents are provided in the shape of long strips is to promote the fitting surface of the side band to drive the airflow, to avoid the driven airflow being blocked by conventional isolated holes and reducing the flow rate, thereby generating a relatively higher air pressure on the fitting surface of the side band. In addition, the device is also provided with an internal blowing device, so that it blows the side band to separate the side band from the top wall plate, thereby shortening the contact section between the side band and the top wall plate, so that the side band is mainly suspended in the air, thereby reducing the running resistance of the side band. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic structural perspective diagram of Embodiment 2 of the present invention; Figure 2 This is a schematic exploded view of the structure of Embodiment 1 of the present invention; Figure 3 It is a schematic side view of the structure of the guide channel body of Example 1 of the present invention; Figure 4 It is a schematic top view of the structure of the guide channel main body of Example 1 of the present invention; Figure 5 Schematic diagram of the effect of the first air blowing seam on the expected side band in Example 1 of the present invention; Figure 6 This is a schematic structural perspective view of the main body of the inner blowing device according to Embodiment 1 of the present invention; Figure 7This is a schematic three-dimensional diagram of the structure of the external blower body of Example 1 of the present invention.

[0018] Description of reference numerals: 1- flow guide groove body, 2- inner blower body, 3- inner blower gasket, 4- outer blower body, 5- outer blower gasket, 6- top wall plate, 7- side wall plate, 8- bottom wall plate, 9- connecting seat, 10- inner area, 11- outer area, 12- vent, 13- first blowing seam, 14- inner blower joint, 15- outer blower joint, 16- shear projection line, 17- outer blower cavity, 18- outer blower interface, 19- inner blower cavity, 20- inner blower interface, 21- upper blade head, 22- lower blade head, 23- frame, 24- second blowing seam. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0020] It should be noted in the description of the present invention that the coordinate system used in this specification when describing the orientation is determined by the posture of the main view of the corresponding component, and the naming of the observation angle of the corresponding view is also based on this. Therefore, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. in this specification indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "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 components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Example 1

[0023] This embodiment provides a disc shear guide groove.

[0024] In one embodiment, Figures 1 to 7 As shown, it includes a connecting seat 9, a guide trough body 1 and an internal blowing device. The connecting seat 9 is suitable for connecting with an external frame 23. The guide trough body 1 is suitable for guiding the edge band cut from the strip steel and is fixedly connected with the connecting seat 9; the guide trough body 1 includes a top wall plate 6, a side wall plate 7 and a bottom wall plate 8 connected to each other, and a long strip-shaped vent hole 12 distributed side by side is opened on the top wall plate 6. The vent hole 12 is arranged along the length direction of the guide trough body 1. The internal blowing device is suitable for blowing airflow into the inside of the guide trough body 1. The internal blowing device is located at the downstream end of the strip steel relative to the vent hole 12; the internal blowing device includes an internal blower body 2, an internal blower gasket 3 and a first blowing slit 13; the first blowing slit 13 is opened on the top wall plate 6 and passes through the top wall plate 6. In order to make the airflow stronger, the width of the first blowing slit 13 is 1~2mm. The inner blower body 2 is located on the upper surface of the top wall plate 6 and is connected to the first blowing slit 13 through the inner blower cavity 19. The inner blower body 2 is arranged on the upper surface of the top wall plate 6, that is, outside the guide groove body 1, so that it can avoid occupying the internal space of the guide groove and make the inner wall of the guide groove as smooth as possible to facilitate the guidance. The inner blower gasket 3 is arranged between the inner blower body 2 and the top wall plate 6 to fill the gap between the two for sealing.

[0025] There are two main reasons for the friction between the sideband and the inner wall of the existing guide groove: first, because the guide groove changes the original movement direction of the sideband, the sideband will produce friction with the guide wall of the guide groove under the action of inertia. For the guide groove that usually guides the sideband downward into the waste hopper, it is often friction with the top wall; second, the inner wall of the existing guide groove is a closed structure, and because the sideband will drive the surrounding airflow to move when it moves, and the moving airflow will form a low-pressure area in the side area of ​​the movement path. Therefore, when one side of the sideband is in contact with the inner wall of the guide groove with a closed structure, the low-pressure area formed on one side of the sideband due to the moving airflow will form an air pressure that further compresses the sideband and the inner wall of the guide groove, thereby further increasing the friction resistance of the sideband. By providing the long strip-shaped vent holes 12, the present device can form an open structure on the top wall plate 6. Even if the side band and the top wall plate 6 are attached to each other under the inertial force, the attached surface of the side band can drive the air in the long strip-shaped vent holes 12, thereby forming air pressure that reduces the pressure on the other side, thereby reducing the friction of the side band. The vent holes 12 are provided in the shape of long strips to promote the airflow driven by the attached surface of the side band, and to avoid the driven airflow being blocked by conventional isolated holes and reducing the flow rate, thereby generating a relatively higher air pressure on the attached surface of the side band.

[0026] In addition, the device is also provided with an internal blowing device, so that it blows the sideband to separate the sideband from the top wall plate 6, thereby shortening the contact section between the sideband and the top wall plate 6, so that the sideband is mainly suspended in the air, thereby reducing the running resistance of the sideband. The reason why the internal blowing device is not directly arranged at the upstream end of the guide groove body 1, but the vent hole 12 is arranged first, is because the gas blown by the internal blowing device can easily fill the gas in the guide groove. If the internal blowing device is too close to the upstream end of the guide groove body 1, the filled gas will flow out from the gap between the disc cutter and the guide groove, so that it is easy to drive the sideband here to emerge from the guide groove together, which is not conducive to reducing the accident of the sideband flying out; in addition, the disc cutter is composed of two butt-jointed disc-shaped upper cutter heads 21 and lower cutter heads 22, and the guide groove is arranged at the middle seam of the two disc-shaped cutter heads, and the space is very narrow, which is only convenient for setting a simple structure such as the vent hole 12, and it is not convenient to set a relatively large blowing device.

[0027] Based on the above implementation, in a preferred implementation, Figures 1 to 3 As shown, the cross section of the guide trough body 1 is a C-shaped semi-enclosed structure, and the side opening of the guide trough body 1 faces the side where the strip steel is located. As mentioned above, the gas blown out by the internal blowing device can easily fill the guide trough with gas, and then the filled gas may drive the side band to emerge from the gap between the disc cutter and the guide trough. In order to reduce the negative impact of the filled gas, the present embodiment sets the guide trough body 1 as an open structure, which is conducive to gas release and can greatly reduce the outflow of gas from the gap between the disc cutter and the guide trough. However, because opening a hole in the plate will increase the manufacturing cost, the guide trough body 1 of the present embodiment omits a wall surface and adopts a C-shaped semi-enclosed structure to achieve opening. The side opening of the guide trough body 1 faces the side where the strip steel is located, which can not only retain the top and bottom surfaces that mainly play a guiding role, but also produce a certain purging effect on the passing strip steel, thereby improving the cleanliness of the strip steel.

[0028] Based on the above implementation, in a preferred implementation, Figure 4As shown, the shear edge of the strip is projected onto the top wall plate 6 as a shear projection line 16; the first air blowing slit 13 and the shear projection line 16 are in an oblique relationship; the upstream end of the first air blowing slit 13 is close to the side where the strip is located, and the other end of the first air blowing slit 13 is far away from the side where the strip is located. In the above embodiment, since the guide groove body 1 is a C-shaped semi-enclosed structure with one side missing, although this is conducive to gas release, it provides the possibility for the sideband to deviate and escape from the guide groove. In order to prevent the sideband from escaping, in addition to the conventional means of increasing the width of the guide groove, this embodiment also adopts the measure of obliquely placing the first air blowing slit 13. Because the shear projection line 16 is the edge line separating the strip from the sideband, the area on the right side of the shear projection line 16, that is, the inner area 10, is the area where the sideband is scheduled to pass, and the area where the sideband may escape from the guide groove once it deviates is the area on the left side of the shear projection line 16, that is, the outer area 11. After the first blowing slot 13 with the above-mentioned inclined posture is set, from the cross section of the upstream end of an expected side band 25, it can be referred to as Figure 5 For example, the first blowing slit 13 will first blow the left side of the expected sideband 25, thereby causing it to rotate counterclockwise in accordance with the right-hand screw rule, so that the expected sideband 25 forms an inclined windward surface, which will cause the expected sideband 25 to move toward the right side until it re-enters the inner area 10 where it should be running, thereby preventing the sideband from escaping from the opening on the left side of the guide groove body 1. Therefore, this embodiment can satisfy the blowing effect on the sideband and prevent the sideband from escaping from the side opening of the guide groove only by using the same inner blowing device. As the expected edge band 25 continues to move forward, the cross-section also moves continuously therewith. Due to the oblique relationship, the point where the first blowing seam 13 on the cross-section intersects with the expected edge band 25 will continue to move to the right, until the intersection point moves to the right side of the center line of the expected edge band 25, thereby starting to blow the already tilted expected edge band 25 to reset it, thereby preventing the expected edge band 25 from moving excessively to the right and causing scratches on the side wall panel 7.

[0029] Based on the above implementation, in a preferred implementation, Figure 4 As shown, the angle between the first blowing slit 13 and the shear projection line 16 is β, β≤20°. If the angle β is too large, such as close to 90° and roughly vertical, the force on the sideband on the same cross section will be close to balanced, and the above-mentioned torsion effect caused by the airflow blowing on one side of the sideband will be greatly reduced. Therefore, setting a smaller angle is conducive to the generation of torsion. In this embodiment, it is preferred that the angle β is not greater than 20°, so that a better torsion effect can be obtained at the current mainstream strip speed.

[0030] As mentioned above, increasing the width of the guide groove helps prevent the side band from escaping from the guide groove opening. Figure 4As shown, the top wall plate 6 includes two parts, specifically, an inner area 10 and an outer area 11 divided by a shear projection line 16. The inner area 10 is located on the side away from the strip relative to the outer area 11, and is the area where the sideband is scheduled to pass; the outer area 11 is a widened area set to prevent the sideband from slipping out. In addition, in this embodiment, the vent 12 is only provided in the inner area 10, and the first blowing slit 13 is continuously provided in the inner area 10 and the outer area 11. The reason for such a setting is that the gas driven by the sideband after the sideband is attached to the top wall of the closed structure mentioned above will form a low pressure, thereby further improving the degree of attachment between the sideband and the top wall. Because the airflow blown out from the first blowing slit 13 will begin to diverge, and the farther away from the outlet, the higher its divergence. The airflow with high divergence is not easy to blow accurately on one side of the sideband, thereby reducing the effect of the torsional effect mentioned above, and ultimately not conducive to preventing the sideband from slipping out. Without the ventilation holes 12 in the outer area 11, the deflected side band entering the outer area 11 will no longer be subjected to the balancing pressure brought by the ventilation holes 12, thereby improving the fit between the side band and the top wall plate 6 and preventing the air flow from diverging when the side band encounters the first blowing seam 13 due to the large distance between the two.

[0031] Based on the above implementation, in a preferred implementation, Figure 1 , 2 As shown in Figure 6, the inner blower body 2 has a structure with one end large and the other end small; the large end of the inner blower body 2 is located at the downstream end of the strip relative to the small end; the inner blower joint 14 is connected to the large end of the inner blower body 2 through the inner blower interface 20. Because the outer area 11 of the top wall plate 6 is located directly below the strip, the closer to the upstream end of the top wall plate 6, the narrower the space between the top wall plate 6 and the strip. As the inner blower body 2 is a component with a certain volume, how the inner blower body 2 in the outer area 11 can avoid interference with the normally moving strip becomes a problem. In this embodiment, the inner blower body 2 is configured as a wedge-shaped body with a large and small end structure, which conforms to the shape in which the space between the top wall plate 6 and the strip becomes larger from upstream to downstream. By setting the internal blower joint 14 at the large end of the internal blower body 2, the gas consumption demand of the first blowing slit 13 can be met. As the gas is continuously blown out from the first blowing slit 13, the gas consumption becomes smaller and smaller, and the flow cross-section of the inner cavity 19 of the internal blower can become smaller and smaller. This is reflected in the outside of the internal blower body 2, and a large and small end structure can be formed. In this way, the space requirement for the installation of the internal blowing device and the gas consumption demand are met.

[0032] Based on the above implementation, in a preferred implementation, Figure 1As shown, an external blowing device is provided at the downstream end of the top wall plate 6; the external blowing device is suitable for blowing airflow in the downstream direction of the top wall plate 6. As mentioned many times before, the flowing gas will generate low pressure on the side, and the sideband coming out from the downstream end of the guide trough body 1 may be driven by the low-pressure compensating airflow caused by the strip steel, and may even overlap with the strip steel and be entangled in the subsequent process flow, causing product defects or even production accidents. By providing an external blowing device, a low-pressure compensating airflow independent of the strip steel is formed, so that the sideband only moves closer to the airflow blown out by the external blowing device. Once the sideband moves upward over the airflow of the external blowing device, it can be quickly smoothed and reset under the blowing of the airflow to avoid being entangled with the strip steel. In addition, the airflow of the external blowing device will lift the sideband located below it, so that the downstream end of the sideband can maintain a moderately close distance with the downstream end of the first air blowing slot 13, thereby preventing the downstream end of the sideband from being excessively far away from the first air blowing slot 13 due to factors such as gravity, and preventing the sideband from being unable to be twisted and reset by the airflow blown out from the downstream end of the first air blowing slot 13 due to problems such as excessive distance and airflow divergence, thereby preventing the sideband from being severely scratched against the side wall panel 7 due to excessive deviation.

[0033] Based on the above implementation, in a preferred implementation, Figure 1 , 2 As shown in Figures 7 and 8, the external blowing device includes an external blowing device body 4 and an external blowing device gasket 5. The external blowing device body 4 is provided with an external blowing device inner cavity 17, and is connected to the external blowing device joint 15 through an external blowing device interface 18. The external blowing device body 4 is located on the upper surface of the top wall plate 6, and the external blowing device gasket 5 is arranged between the external blowing device body 4 and the top wall plate 6. The external blowing device gasket 5 is as shown in Figure 8. Figure 2 The structure is a semi-enclosed structure in a C shape, wherein the side opening of the outer blower gasket 5, the bottom surface of the outer blower body 4 and the upper surface of the top wall plate 6 jointly form a second air blowing slit 24, and the second air blowing slit 24 faces the downstream direction of the top wall plate 6. The outer blowing device with such a structure utilizes the notch design of the outer blower gasket 5, so that the second air blowing slit 24 can be formed very easily, eliminating the need for laser cutting or wire cutting, which is a more complicated and expensive processing step for the fine slit structure, thereby simplifying the production process and reducing the manufacturing cost.

[0034] Based on the above implementation, in a preferred implementation, Figure 3 As shown, when viewed from the side, the angle between the top wall plate 6 and the moving direction of the strip is α.

[0035]

[0036] Where ρ is the density of the sideband (g / m 3 ), g is the acceleration due to gravity (m / s 2), δ is the thickness of the sideband (mm), w is the width of the sideband (mm), and v is the running speed of the sideband (m / min).

[0037] The running resistance of the sideband is mainly due to the friction between the sideband in high-speed linear motion and the inner wall of the guide groove when it is guided and turned by the guide groove. The angle α between the top wall plate 6 and the moving direction of the strip is the main angle that determines the sideband being guided and turned by the guide groove, so it is very important. If the angle is too large, it will easily cause excessive running resistance of the sideband. Through the above empirical formula, the appropriate angle α can be simply and quickly estimated according to the type of material, such as steel or aluminum, as well as the equipment running speed and the size of the sideband itself, thereby facilitating equipment design.

[0038] Example 2

[0039] This embodiment provides a disc shear.

[0040] In one embodiment, Figure 1 As shown, it includes a frame 23, a disc cutter and a disc shear guide groove of Example 1. The disc cutter is arranged on the frame 23, including an upper cutter head 21 and a lower cutter head 22, which is suitable for shearing strip steel. The disc shear guide groove is arranged on the downstream side of the middle seam between the upper cutter head 21 and the lower cutter head 22. Its connecting seat 9 is connected to the frame 23 to meet the support function of the guide groove body 1.

[0041] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A disc shear guide trough, characterized in that: include: A connecting seat (9) adapted to be connected to an external frame (23); The guide trough body (1) is suitable for guiding the edge strip cut from the strip steel and is fixedly connected to the connecting seat (9); the guide trough body (1) comprises a top wall plate (6), a side wall plate (7) and a bottom wall plate (8) connected to each other, and the top wall plate (6) is provided with long strip-shaped vent holes (12) arranged side by side; the vent holes (12) are arranged along the length direction of the guide trough body (1); An internal blowing device is suitable for blowing air into the interior of a guide groove body (1); the internal blowing device is located at the downstream end of the strip relative to the vent hole (12); the internal blowing device comprises an internal blowing device body (2), an internal blowing device gasket (3) and a first blowing slit (13); the first blowing slit (13) is provided on the top wall plate (6) and passes through the top wall plate (6), and the width of the first blowing slit (13) is 1 to 2 mm; the internal blowing device body (2) is located on the upper surface of the top wall plate (6) and is connected to the first blowing slit (13), and the internal blowing device gasket (3) is arranged between the internal blowing device body (2) and the top wall plate (6).

2. The disc shear guide groove according to claim 1, characterized in that: The cross section of the guide trough body (1) is a C-shaped semi-enclosed structure, and the side opening of the guide trough body (1) faces the side where the strip steel is located.

3. The disc shear guide groove according to claim 2, characterized in that: The shear edge of the steel strip is projected onto the top wall plate (6) as a shear projection line (16); the first air blowing slit (13) and the shear projection line (16) are in an oblique relationship; the upstream end of the first air blowing slit (13) is close to the side where the steel strip is located, and the other end of the first air blowing slit (13) is away from the side where the steel strip is located.

4. The disc shear guide groove according to claim 3, characterized in that: The included angle between the first blowing seam (13) and the shear projection line (16) is β, and β is ≤ 20°.

5. The disc shear guide groove according to claim 3, characterized in that: The top wall plate (6) is divided into an inner area (10) and an outer area (11) by a shear projection line (16), wherein the inner area (10) is located on a side away from the strip relative to the outer area (11); the vent holes (12) are only arranged in the inner area (10), and the first blowing seam (13) is continuously arranged in the inner area (10) and the outer area (11).

6. The disc shear guide groove according to claim 5, characterized in that: The inner blower body (2) has a structure with one end being large and the other end being small; the large end of the inner blower body (2) is located at the downstream end of the steel strip relative to the small end; and an inner blower joint (14) is provided at the large end of the inner blower body (2).

7. The disc shear guide groove according to claim 1, characterized in that: An external blowing device is provided at the downstream end of the top wall plate (6); the external blowing device is suitable for blowing airflow in the downstream direction of the top wall plate (6).

8. The disc shear guide groove according to claim 7, characterized in that: The external blowing device comprises an external blowing device body (4) and an external blowing device gasket (5); the external blowing device body (4) is located on the upper surface of the top wall plate (6), and the external blowing device gasket (5) is arranged between the external blowing device body (4) and the top wall plate (6); the external blowing device gasket (5) is a C-shaped semi-enclosed structure, and the side opening of the external blowing device gasket (5), the bottom surface of the external blowing device body (4) and the upper surface of the top wall plate (6) jointly form a second blowing slit (24), and the second blowing slit (24) faces the downstream direction of the top wall plate (6).

9. The disc shear guide groove according to any one of claims 1 to 8, characterized in that: When viewed from the side, the angle between the top wall plate (6) and the moving direction of the strip is α. ； Where ρ is the density of the sideband g / m 3 , g is the acceleration due to gravity m / s 2 , δ is the thickness of the sideband (mm), w is the width of the sideband (mm), and v is the running speed of the sideband (m / min).

10. A disc shear, characterized in that: include: Rack (23); A disc cutter, arranged on the frame (23) and suitable for shearing the strip steel; The disc shear guide groove according to any one of claims 1 to 9 is located downstream of the disc cutter; the connecting seat (9) is connected to the frame (23).

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