Quick-opening chute capable of reducing scrap edge, flash and blocking probability of high-speed soft steel

Abstract

The invention discloses a quick-opening chute capable of reducing high-speed mild steel slitter edge flash and blocking probability, which is characterized in that two vertical plates are positioned on two sides of a bottom plate, the lower ends of the vertical plates are fixed with the bottom plate, and after the lower end of a cover plate is matched with the upper ends of the vertical plates, a channel is formed in the middle of a chute body, an inlet is formed in one end of the chute body, and an outlet is formed in the other end of the chute body; the inner surface, located in the channel, of the bottom plate is a slope. The lower surface of each cover plate comprises a first slope surface, a second slope surface and a third slope surface which are used for reducing friction force between the soft steel waste edge and the cover plate, one end of each second slope surface is connected with one end of the corresponding first slope surface, the height of one end of each second slope surface is lower than that of the other end of the corresponding first slope surface, and a first included angle is formed between each first slope surface and the horizontal direction; the other end of the second slope surface is matched with one end of the third slope surface, and the other end of the third slope surface is lower than the other end of the second slope surface. The method has the advantage that the high-speed soft steel waste edge trimming and blocking probability is reduced.

Description

Technical Field

[0001] This invention relates to strip steel production equipment, and in particular to a quick-opening chute for reducing the probability of scrap edges and blockages in high-speed soft steel. Background Technology

[0002] A disc shear is a metallurgical device that uses rotating disc blades to continuously shear moving strip steel longitudinally. Also known as a disc shearing machine, it is mainly used for trimming and slitting cold-rolled strip steel. Based on its application, it is divided into edge-trimming disc shears and longitudinal continuous shearing disc shears. Based on its transmission method, it is divided into power shears and tension shears. The transmission system can switch between the two modes via a clutch. The equipment consists of left and right frames, upper and lower cutter shafts, an adjustment mechanism, and an edge-trimming device. An electric guide screw adjusts the cutter head gap and overlap, and a waste chute is provided at the outlet for edge material recovery.

[0003] The existing steel mill's chutes and disc shears frequently experience burrs and chute jamming when shearing soft, thin materials less than 1mm thick. This occurs weekly, requiring machine shutdown each time burrs or jamming occurs, a persistent problem for users. Analysis of the chute structure revealed the following factors: like Figure 1 and Figure 2 As shown, the cover plate on the chute adopts a single angle, that is, the inner surface of the cover plate is a slope, and the angle between the slope and the horizontal direction is α, the size of which is 28°. When the waste wire passes through, it will first contact the upper cover plate and then bend downwards, and then enter the edge shearing chute. There is no problem when the waste wire passes through at low speed. When the waste wire passes through at high speed, because the soft steel is more flexible than the thicker strip steel, when the friction between the waste wire and the upper cover plate is too large, it cannot enter the edge shearing chute in time, which can easily cause edge blockage. In addition, during high-speed production, because the rigidity of the soft specification waste wire is not enough, the waste wire is very easy to arch during operation, especially during acceleration, causing flash. When dealing with edge blockage, the chute is not easy to open and cleaning is complicated.

[0004] In addition, CN209998839U discloses a high-speed disc shearing waste edge air-blowing and guiding device, which has a nozzle installed on the chute structure. During use, the nozzle sprays gas, causing the waste edge to be suspended in the chute and smoothly discharged. As can be seen from the attached drawings, the nozzle is located inside the chute structure. When the head of the waste edge enters the chute structure, it will cause the waste edge to collide with the chute structure, thus causing blockage. Summary of the Invention

[0005] This invention provides a quick-opening chute that reduces the probability of flash and blockage in high-speed mild steel. The technical solutions to the above technical problems are as follows: A quick-opening chute for reducing the probability of scrap edges and blockages in high-speed mild steel includes a chute body, which includes a bottom plate, vertical plates, and a cover plate. There are two vertical plates located on both sides of the bottom plate. The lower end of the vertical plates is fixed to the bottom plate. The lower end of the cover plate is fitted with the upper end of the vertical plates, so that the middle of the chute body is a channel, forming an inlet at one end and an outlet at the other end. The inner surface of the bottom plate inside the channel is a slope. The lower surface of the cover plate includes a first slope, a second slope, and a third slope to reduce the friction between the soft steel scrap edge and the cover plate. One end of the second slope is connected to one end of the first slope, and the height of one end of the second slope is lower than the height of the other end of the first slope. The first slope forms a first angle with the horizontal direction. The other end of the second slope is matched with one end of the third slope, and the height of the other end of the third slope is lower than the height of the other end of the second slope.

[0006] The present invention decomposes the single slope of the cover plate in the prior art into a first slope, a second slope, and a third slope. The advantages of this are as follows: on the one hand, it can reduce the slope (first slope) of the lower surface of the cover plate at the entrance, which can reduce the contact pressure between the strip steel scrap and the cover plate, thereby reducing friction and reducing the probability of edge blockage and flash; on the other hand, since the lower surface of the modified cover plate is a three-segment slope, the lower surface of the cover plate arches upward relative to the single slope in the prior art, thereby increasing the space between the cover plate and the bottom plate 1, which reduces the probability of edge blockage. Attached Figure Description

[0007] Figure 1 This is a cross-sectional view of the chute described in the background art.

[0008] Figure 2 For the strip scrap to enter Figure 1 A schematic diagram showing the angle formed between the chute and the cover plate, and the frictional resistance.

[0009] Figure 3 This is a perspective view of the quick-opening chute of the present invention.

[0010] Figure 4 This is a cross-sectional view of the quick-opening chute of the present invention.

[0011] Figure 5 This is a side view of the upright panel.

[0012] Figure 6 This is a three-dimensional view of the fixed cover plate.

[0013] Figure 7 This is a schematic diagram of the movable cover plate assembly rotating under the force of the strip steel.

[0014] Figure 8 This is a schematic diagram of the quick-opening chute and the disc shear working together.

[0015] Figure 9 In order to be in Figure 8 The diagram of the disc after being cut is hidden on the basis of the original design.

[0016] Figure 10 This is a cross-sectional view of the jet nozzle.

[0017] Figure 11 For the strip scrap to enter Figure 4 A schematic diagram showing the angle formed between the chute and the cover plate, and the frictional resistance.

[0018] The markings in the attached diagram are as follows: base plate 1, inner surface 1a, inlet 1b, outlet 1c, vertical plate 2, protrusion 2a, first slope A, second slope B, third slope C, first included angle α1, fourth slope D, fifth slope E, sixth slope G, fixed cover plate 3, notch 3a, assembly port 3b, first mating surface 3c, baffle 4, guide section 4a, second mating surface 4b, bracket 5, shaft 6, connecting rod 7, cylinder 8, air inlet 9, jet nozzle 10, first connecting pipe 10a, second connecting pipe 10b, nozzle 10c, sleeve 10d, positioning sleeve 10e, annular step 10f, annular groove 10g, shoulder 10h, support frame 11, first bracket 11a, second bracket 11b, first strip hole 11c, second strip hole 11d, air supply assembly 12. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] like Figures 3 to 10 As shown, the quick-opening chute of the present invention for reducing the probability of high-speed soft steel scrap, flash, and blockage includes a chute body, which includes a bottom plate 1, a vertical plate 2, and a cover plate. There are two vertical plates 2 located on both sides of the bottom plate 1. The lower end of the vertical plate 2 is fixed to the bottom plate 1. The included angle between the vertical plate 2 and the bottom plate 1 is 90°. After the lower end of the cover plate is engaged with the upper end of the vertical plate 2, the middle of the chute body is a channel T, with an inlet 1b at one end and an outlet 1c at the other end. The bottom plate 1 is arranged in a state where one end is higher than the other end. The inner surface 1a of the bottom plate 1 within the channel T is a slope.

[0021] The lower surface of the cover plate includes a first slope A, a second slope B, and a third slope C to reduce the friction between the soft steel scrap edge and the cover plate. One end of the second slope B is connected to one end of the first slope A. The height of one end of the second slope B is lower than the height of the other end of the first slope A. The first slope A forms a first angle α1 with the horizontal direction. The first angle α1 is preferably 10°. After improvement, the first angle α1 is reduced by 18° compared with the angle α in the background technology. The other end of the second slope B is matched with one end of the third slope C. The height of the other end of the third slope C is lower than the height of the other end of the second slope B.

[0022] The above structure decomposes the single slope of the cover plate in the background technology into a first slope A, a second slope B, and a third slope C. The advantages of this are: firstly, it can reduce the slope of the lower surface of the cover plate at the inlet 1b, which can reduce the contact pressure between the strip scrap edge and the cover plate, thereby reducing friction and lowering the probability of edge blockage and flash; secondly, because the lower surface of the modified cover plate is a three-segment slope, the lower surface of the cover plate arches upward relative to the single slope in the background technology, thereby increasing the space between the cover plate and the bottom plate 1, which reduces the probability of edge blockage.

[0023] In this embodiment, to facilitate the installation of the cover plate, the upper end face of the vertical plate 2 includes a fourth slope D, a fifth slope E, and a sixth slope G that mate with the lower surface of the cover plate. One end of the fifth slope E is connected to one end of the fourth slope D, and the height of one end of the fifth slope E is lower than the height of the other end of the fourth slope D. The other end of the fifth slope E mates with one end of the sixth slope G, and the height of the other end of the sixth slope G is lower than the height of the other end of the fifth slope E. Preferably, one end of the fifth slope E and one end of the fourth slope D are rounded, and the other end of the fifth slope E and one end of the sixth slope G are also rounded. The fourth slope D mates with the first slope A, the fifth slope E mates with the second slope B, and the sixth slope G mates with the third slope C.

[0024] In this embodiment, the cover plate includes a fixed cover plate 3 and a movable cover plate assembly that moves under the force of the soft steel scrap edge and forms a quick-opening chute inlet 1b with the base plate 1 and the upright plate 2. The fixed cover plate 3 is fixed to the two upright plates 2 and has a notch 3a. The movable cover plate assembly cooperates with the notch 3a and also cooperates with the inner sidewall of one of the upright plates 2. When the soft steel scrap edge enters the channel T inside the quick-opening chute from the quick-opening chute inlet 1b, the movement path of the soft steel scrap edge is dynamic. Therefore, friction may occur between the soft steel scrap edge and the movable cover plate assembly. If the soft steel scrap edge is not blocked, the friction force generated between the soft steel scrap edge and the cover plate assembly is less than the force of the movable cover plate assembly, so the movable cover plate assembly will not rotate.

[0025] In this embodiment, the movable cover plate assembly includes a baffle 4, a bracket 5, a shaft 6, a connecting rod 7, and a cylinder 8. The lower surface of the fixed cover plate 3 has a first slope A, a second slope B, and a third slope C, and the lower surface of the baffle 4 has a first slope A and a second slope B. The baffle 4 mates with the notch 3a and the inner wall of one of the upright plates 2. In this embodiment, since the scrap edge of the soft steel will rub against the base plate 1, the upright plate 2, the fixed cover plate 3, and the baffle 4, the base plate 1, the upright plate 2, the fixed cover plate 3, and the baffle 4 are all made of wear-resistant material. One end of the baffle 4 overlaps the fixed cover plate 3. The baffle 4 is fixed to the bracket 5, the bracket 5 is hinged to the shaft 6, the connecting rod 7 is fixed to the bracket 5, the connecting rod 7 is connected to the piston rod of the cylinder 8, and the cylinder body of the cylinder 8 is fixed to the cylinder bracket (the cylinder bracket is not shown in the figure).

[0026] The movable cover assembly also includes a proximity switch, a controller, and an alarm. The proximity switch is used to detect the position of the cover 4. The proximity switch is connected to the controller, and the controller is connected to the alarm. The controller can be a PLC, and the alarm can be an audible and visual alarm.

[0027] When the scrap steel edge becomes stuck in the chute body, the force generated by the stuck scrap steel edge is greater than the force of cylinder 8. This causes baffle 4, bracket 5, and connecting rod 7 to rotate around shaft 6. One end of baffle 4 separates from the fixed cover plate 3 at the overlap point, and the piston rod of cylinder 8 moves up and down. As the position of baffle 4 changes during rotation, when the proximity switch detects the change in position of baffle 4, it transmits the position change detection signal to the controller. The controller outputs a signal to the alarm, which then triggers an alarm signal to alert the operator that a blockage has occurred. Each upright plate 2 has a protrusion 2a at its upper end, and one end of the fixed cover plate 3 has an assembly port 3b. The assembly port 3b cooperates with the protrusion 2a, and the protrusion 2a positions the fixed cover plate 3. This structure can improve the assembly accuracy between the fixed cover plate 3 and the upright plate 2.

[0028] The fixed cover plate 3 is provided with a first mating surface 3c for overlapping with the baffle 4. The first mating surface 3c is an inclined surface. One end of the baffle 4 is provided with a guide section 4a that guides the soft steel scrap downward. One end of the guide section 4a is provided with a second mating surface 4b that overlaps with the first mating surface 3c. The second mating surface 4b is an inclined surface and overlaps the first mating surface 3c.

[0029] In this embodiment, after the guide section 4a is provided on the baffle 4, if the soft steel scrap edge moves along the second slope B of the baffle 4, the soft steel scrap edge is blocked by the guide section 4a, and the guide section 4a forces the soft steel scrap edge to hang down, thereby forcing the soft steel scrap edge to bend downward.

[0030] The cover plate is provided with a clearance opening. In this embodiment, the other end of the baffle 4 extends beyond the other end of the fixed cover plate 3, thereby forming the clearance opening on the cover plate. When the cover plate and the vertical plate 2 are engaged, a portion of the clearance opening is occupied by the vertical plate 2, forming an air inlet 9 between the cover plate and the vertical plate 2. The air inlet 9 is connected to the channel T, and the air inlet 9 is connected to the inlet 1b of the chute body.

[0031] This embodiment also includes an air-blowing assembly that applies downward air pressure to the soft steel scrap passing below the air inlet 9. The air-blowing assembly includes a nozzle 10, a support frame 11, and an air supply assembly 12. The nozzle 10 is located above the cover plate, and its output end mates with the air inlet 9. The nozzle 10 is connected to the support frame 11, and the output end of the air supply assembly 12 is connected to the input end of the nozzle 10. The air supply assembly 12 consists of an air source, a pipeline, a pressure reducing valve, and a throttle valve. The air source is connected to the pipeline, and the pressure reducing valve and the throttle valve are installed on the pipeline.

[0032] In this embodiment, the air-blowing assembly is arranged outside the channel T and above the air inlet 9, which is connected to the chute body inlet 1b. Because the gas output from the air-blowing assembly exerts pressure on the strip, firstly, it makes it easier for the strip's scrap edge to enter the chute, reducing the probability of flash. Secondly, when the strip scrap edge enters the chute body, the air-blowing pressure causes it to bend downwards, reducing the friction between the scrap edge and the lower surface of the cover plate, further reducing the resistance and thus lowering the probability of clogging and flash. Thirdly, since powder is generated after the disc shear Y cuts the strip, and this powder remains on the strip surface, the gas blown by the air-blowing assembly outside the channel T can remove this powder, preventing friction damage to the strip surface during subsequent processes.

[0033] In this embodiment, the jet nozzle 10 includes a first connecting pipe 10a, a second connecting pipe 10b, a nozzle 10c, and a sleeve 10d. The first connecting pipe 10a is connected to the support frame 11. The inner hole of the first connecting pipe 10a is a stepped hole with steps. A portion of the hole wall surface of the inner hole of the first connecting pipe 10a is a spherical surface. The outer surface of the second connecting pipe 10b is a spherical surface. A portion of the second connecting pipe 10b is located inside the first connecting pipe 10a. A portion of the outer surface of the second connecting pipe 10b mates with the spherical surface inside the first connecting pipe 10a. The other portion of the second connecting pipe 10b is located outside the first connecting pipe 10a. The nozzle 10c is connected to the second connecting pipe 10b. One end of the sleeve 10d is provided with a positioning sleeve 10e. The sleeve 10d is fitted onto the first connecting pipe 10a and threadedly connected to the first connecting pipe 10a. The second connecting pipe 10b is clamped between the steps of the stepped hole of the positioning sleeve 10e.

[0034] In the above structure, since the second connecting pipe 10b and the first connecting pipe 10a are fitted with a spherical surface, the second connecting pipe 10b can be rotated to the required angle and then threadedly connected to the first connecting pipe 10a through the sleeve 10d. After adjusting the second connecting pipe 10b to the required angle, it can be fixed in place. This structure allows a portion of the airflow to act on the upper surface of the strip waste edge, applying pressure to the strip waste edge and preventing it from flying or clogging. On the other hand, it allows a portion of the airflow to act on the strip surface, improving the cleaning efficiency of powder retained on the strip surface.

[0035] The inner wall of the second connecting pipe 10b is provided with an annular step 10f, which makes the inner hole of the second connecting pipe 10b a stepped hole. The inner circumferential surface of the annular step 10f is provided with an annular groove 10g, and the circumferential surface of the nozzle 10c is provided with a shoulder 10h, which is clearance-fitted with the annular groove 10g.

[0036] The support frame 11 includes a first bracket 11a, a second bracket 11b, and fasteners. The first bracket 11a has a first slot 11c for adjusting the position of the nozzle 10 along the longitudinal direction of the air inlet 9. The second bracket 11b has a second slot 11d for adjusting the position of the nozzle 10 along the transverse direction of the air inlet 9. The fastener passes through the first slot 11c and the second slot 11d to fix the first bracket 11a and the second bracket 11b. The second bracket 11b is fixed to the nozzle 10. This structure allows for adjustment of the overall position of the air blowing assembly along the transverse and / or longitudinal direction of the air inlet 9 as needed.

[0037] like Figure 2 As shown, when the strip waste enters the chute from the inlet, it enters the chute from the inlet in a direction that is basically parallel to the horizontal. The strip waste comes into contact with the inner surface of the cover plate. The frictional resistance of the strip waste on the inner surface of the cover plate before the improvement is calculated as: F×sin28°×μ.

[0038] like Figure 4 and Figure 11 As shown, when the strip steel scrap enters the channel T from the inlet 1b, it enters the channel T in a direction that is basically parallel to the horizontal. The strip steel first comes into contact with the first slope A. Therefore, the frictional resistance at the first slope A is calculated as follows: Frictional resistance is: f × sin10° × μ Where μ is the coefficient of friction.

[0039] When the scrap edges of the strip steel are of the same specification, F=f The ratio of frictional resistance after modification to that before modification is: f×sin10°×μ / (F×sin28°×μ)=sin10° / sin28°≈0.37 In summary, after the modification, the friction between the waste wire head and the upper cover of the waste chute is 0.37, which is the same as before the modification. This shows that the present invention greatly improves the problem of waste wire blockage and flash.

Claims

1. A quick-opening chute for reducing the probability of scrap edges and blockages in high-speed soft steel, comprising a chute body, the chute body comprising a bottom plate (1), a vertical plate (2), and a cover plate, wherein there are two vertical plates (2) located on both sides of the bottom plate (1), the lower end of the vertical plate (2) is fixed to the bottom plate (1), and the lower end of the cover plate is fitted with the upper end of the vertical plate (2) to make the middle of the chute body a channel (T) with an inlet (1b) at one end and an outlet (1c) at the other end, the inner surface (1a) of the bottom plate (1) located in the channel (T) is a slope, characterized in that: The lower surface of the cover plate includes a first slope (A), a second slope (B), and a third slope (C) to reduce the friction between the soft steel scrap edge and the cover plate. One end of the second slope (B) is connected to one end of the first slope (A), and the height of one end of the second slope (B) is lower than the height of the other end of the first slope (A). The first slope (A) forms a first angle (α1) with the horizontal direction. The other end of the second slope (B) is matched with one end of the third slope (C), and the height of the other end of the third slope (C) is lower than the height of the other end of the second slope (B).

2. The quick-opening chute for reducing the probability of high-speed mild steel scrap and blockage as described in claim 1, characterized in that, The cover plate includes a fixed cover plate (3) and a movable cover plate assembly that moves under the force of the soft steel scrap edge and forms a quick-opening chute inlet with the bottom plate (1) and the vertical plate (2). The fixed cover plate (3) is fixed to the two vertical plates (2). The fixed cover plate (3) has a notch (3a). The movable cover plate assembly cooperates with the notch (3a). The movable cover plate assembly also cooperates with the inner wall of one of the vertical plates (2).

3. The quick-opening chute for reducing the probability of scrap and blockage in high-speed mild steel according to claim 2, characterized in that, Each upright plate (2) has a protrusion (2a) at its upper end, and a mounting opening (3b) is provided at one end of the fixed cover plate (3). The mounting opening (3b) cooperates with the protrusion (2a), and the protrusion (2a) positions the fixed cover plate (3).

4. The quick-opening chute for reducing the probability of high-speed mild steel scrap and blockage according to claim 2, characterized in that, The movable cover plate assembly includes a baffle (4), a bracket (5), a shaft (6), a connecting rod (7), and a cylinder (8). The baffle (4) is fitted with the notch (3a) and the inner wall of one of the upright plates (2). One end of the baffle (4) covers the fixed cover plate (3). The baffle (4) is fixed to the bracket (5). The bracket (5) is hinged to the shaft (6). The connecting rod (7) is fixed to the bracket (5). The connecting rod (7) is connected to the piston rod of the cylinder (8).

5. The quick-opening chute for reducing the probability of high-speed mild steel scrap and blockage according to claim 4, characterized in that, The lower surface of the fixed cover plate (3) has a first slope (A), a second slope (B) and a third slope (C), and the lower surface of the baffle (4) has a first slope (A) and a second slope (B).

6. The quick-opening chute for reducing the probability of high-speed mild steel scrap and blockage according to claim 4, characterized in that, The fixed cover plate (3) is provided with a first mating surface (3c) for overlapping with the baffle (4). The first mating surface (3c) is an inclined surface. One end of the baffle (4) is provided with a guide section (4a) that guides the waste edge downward. One end of the guide section (4a) is provided with a second mating surface (4b) that overlaps with the first mating surface (3c). The second mating surface (4b) is an inclined surface and overlaps the first mating surface (3c).

7. The quick-opening chute for reducing the probability of high-speed mild steel scrap and blockage according to claim 1, characterized in that, The cover plate is provided with a clearance opening. After the cover plate and the upright plate (2) are fitted together, an air inlet (9) is formed between the cover plate and the upright plate (2). The air inlet (9) is connected to the channel (T). It also includes an air blowing assembly that applies downward air pressure to the soft steel scrap passing below the air inlet (9). The air blowing assembly includes a nozzle (10), a support frame (11), and an air supply assembly (12). The nozzle (10) is located above the cover plate. The output end of the nozzle (10) is matched with the air inlet (9). The nozzle (10) is connected to the support frame (11). The output end of the air supply assembly (12) is connected to the input end of the nozzle (10).

8. The quick-opening chute for reducing the probability of high-speed mild steel scrap and blockage according to claim 7, characterized in that, The nozzle (10) includes a first connecting pipe (10a), a second connecting pipe (10b), a nozzle (10c), and a sleeve (10d). The first connecting pipe (10a) is connected to the support frame (11). The inner hole of the first connecting pipe (10a) is a stepped hole with steps. A portion of the hole wall surface of the inner hole of the first connecting pipe (10a) is a spherical surface. The outer surface of the second connecting pipe (10b) is a spherical surface. A portion of the second connecting pipe (10b) is located inside the first connecting pipe (10a). A portion of the outer surface of the tube (10b) mates with the spherical surface inside the first connecting tube (10a). Another portion of the second connecting tube (10b) is located outside the first connecting tube (10a). The nozzle (10c) is connected to the second connecting tube (10b). One end of the sleeve (10d) is provided with a positioning sleeve (10e). The sleeve (10d) is fitted onto the first connecting tube (10a) and threadedly connected to the first connecting tube (10a). The second connecting tube (10b) is clamped between the steps of the stepped hole of the positioning sleeve (10e).

9. The quick-opening chute for reducing the probability of high-speed mild steel scrap, flash, and blockage according to claim 8, characterized in that, The inner wall of the second connecting pipe (10b) is provided with an annular step (10f), which makes the inner hole of the second connecting pipe (10b) a stepped hole. The inner circumferential surface of the annular step (10f) is provided with an annular groove (10g), and the circumferential surface of the nozzle (10c) is provided with a shoulder (10h), which is in clearance fit with the annular groove (10g).

10. The quick-opening chute for reducing the probability of high-speed mild steel scrap and blockage according to claim 7, characterized in that, The support frame (11) includes a first bracket (11a), a second bracket (11b), and fasteners. The first bracket (11a) is provided with a first strip hole (11c) for adjusting the position of the nozzle (10) along the longitudinal direction of the air inlet (9). The second bracket (11b) is provided with a second strip hole (11d) for adjusting the position of the nozzle (10) along the transverse direction of the air inlet (9). The first strip hole (11c) and the second strip hole (11d) through which the fastener passes fix the first bracket (11a) and the second bracket (11b). The second bracket (11b) is fixed to the nozzle (10).

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