TW202212579A - Wire coil cooling apparatus - Google Patents

Abstract

The invention provides a wire coil cooling apparatus being capable that a wire member suspending a cover covering an upper end of a wire coil through a pully from above of the wire coil is difficult of being off from the pully no matter of the stacking number of the wire coils. A wire coil cooling apparatus includes a cover 9 which contacts an upper end 2c in a penetrating direction of the wire coil 2 and covers the wire coil, a blower hole 10c which located at a lower end side in the penetrating direction of the wire coil and blows an air into an inner side of the wire coil toward the cover side, and a suspended support member 8 which is suspended by a wire member 11 through a pully 14 from above the wire coil and can support the cover, wherein the suspended support member has a rod 13 as a guide part guiding movements in up and down directions of the cover, and the wire coil is transported on a plural of roller 4b arranged with spaced apart in the predetermined direction.

Description

Cooling device for wire coil

The present invention relates to a cooling device for wire coils, in which, regardless of the number of stacked wire coils, the metal wire suspended from above the wire coil via a pulley to cover the covering member on the upper end of the wire coil is difficult to escape from the pulley.

Conventionally, there are Patent Documents 1 to 5 regarding the operation and treatment of a wire coil obtained by tightly winding a wire rod of carbon steel, stainless steel, or the like in a direction orthogonal to the winding direction.

The "wire coil" of Patent Document 1 is composed of a wire coil obtained by tightly winding binding rings in a direction orthogonal to the wire coil winding direction at a plurality of locations in the wire coil direction, so that the coil has a width. A belt-shaped and softer than iron wire barrel winding ring is tightly wound around the barrel portion of the wire rod coil in the direction of the winding direction of the wire rod and intersecting with the binding ring.

In the "cooling method and cooling apparatus of a wire coil" of Patent Document 2, the wire coil is placed in a storage place, and one end of the hollow portion of the wire coil is plugged with a plugging plate. By blowing air into the other end of the hollow portion with a blower, each part of the wire coil can be uniformly and rapidly cooled. Thereby, cooling is performed by setting the cooling rate of each part of the wire coil between 600°C and 200°C to be 16°C/min or more.

The "annealing method and annealing equipment for a steel sheet coil" of Patent Document 3 is performed by placing a coiled steel sheet on a coil mounting table with its axial direction up-end and accommodating it in an inner cover. In the annealing method of the annealed steel sheet coil, after the steel sheet coil is heated and soaked, the cooling gas is sprayed toward the inner peripheral surface of the steel sheet coil when cooling.

The "annealing method and annealing furnace of a metal strip coil" of Patent Document 4 covers a metal strip coil in which a metal strip is wound into a coil shape with an inner cover, and when the above-mentioned metal strip coil is annealed by radiant heat from the inner cover In at least the first half of the heat treatment of the annealing, the radiant heat directed to the inner peripheral surface of the metal coil is blocked, and on the other hand, the blocking is opened during the cooling treatment.

The "coil cooling device" of Patent Document 5 is a coil cooling device provided with a cooling chamber, a cooler, and a circulation means, and is configured such that the outlet of the ambient gas in the circulation means is located at one of the storage places. side, and a blocking plate for blocking the ends of the wire coils stored in the above storage place is arranged on the other side in a distance relative to the above-mentioned air outlet; wherein, the cooling chamber is provided with a wire rod inside the cooling chamber. In the above-mentioned storage place of the coil, the cooler is used for cooling the ambient gas, and the circulation means is used for circulating the cooled ambient gas to the above-mentioned storage place. [Prior Art Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 3-98863 Patent Document 2: Japanese Patent Laid-Open No. 7-300624 Patent Document 3: Japanese Patent Laid-Open No. 2013-163852 Patent Document 4: Japanese Patent Laid-Open No. 2013-181210 Patent Document 5: Japanese Patent Laid-Open No. 4-17627

(The problem that the invention intends to solve)

Patent Document 5 exemplifies a configuration in which the upper end of the hollow portion of the coil of the wire rod is closed with a blocking plate, and air is blown in from the lower end side of the hollow portion to cool the coil.

The blocking plate is connected with the lifting device through the metal wire and the pulley, and is suspended from the upper part of the wire coil so as to be movable up and down.

When cooling the coil, there are cases in which one coil is individually cooled, and there are cases in which a plurality of coils are stacked so that each cavity portion communicates in the up-down direction, and these coils are simultaneously cooled. .

The position of the blocking plate at the upper end of the blocking coil varies depending on the height of the coil to be stacked. Therefore, the wire for suspending the clogging plate from above must have at least a length that allows the clogging plate to be placed on the upper end of one of the wire coils arranged separately.

However, there is a problem in that if the clogging plate is suspended by a wire having a length that allows the clogging plate to be placed on the upper end of the individually arranged coil, the clogging plate is placed on a plurality of stacked coils. At the upper end of the wire, the tension of the wire will loosen, and the wire may be detached from the coiled pulley.

The present invention has been made in view of the above-mentioned conventional problems, and its object is to provide a cooling device for a wire coil, which is suspended from above the wire coil via a pulley to cover the wire coil regardless of the number of stacked wire coils. It is difficult for the metal wires of the covering member on the upper end to be separated from the pulley. (Technical means to solve problems)

The cooling device for a wire coil according to the present invention is characterized by comprising: a covering member that abuts on an upper end of the wire coil in the penetrating direction to cover the wire coil; The lower end side in the penetrating direction blows air from the inside of the wire coil toward the covering member side; and a suspension support body is suspended by a wire from above the wire coil via a pulley, and can support the covering member; The said suspension support body has a guide part which can guide the said cover member to move in an up-down direction, and the said wire coil is conveyed on a plurality of rollers arranged in a predetermined direction at a distance from each other.

The wire coil is placed on a tray, and is conveyed on the roller, and the tray is provided with an opening through which the air blown from the ventilation hole circulates.

A blocking plate is provided between the plurality of rollers. (Compared to the efficacy of the prior art)

The cooling device of the wire coil of the present invention can prevent the wire that is suspended from the upper side of the wire coil via the pulley and is used to cover the upper end of the wire coil from the pulley, regardless of the number of the wire coils to be stacked. .

Hereinafter, preferred embodiments of the cooling device for the wire coil of the present invention will be described in detail with reference to the accompanying drawings. A wire coil cooling device (hereinafter referred to as a cooling device) 1 of the present embodiment is a device for cooling a wire coil 2, which, as shown in FIG. 1, winds the wire 2a in a cylindrical shape and The wound wire 2a is formed by bundling a plurality of places in the circumferential direction with a bandage or the like.

The inner side of the cylindrical wire coil 2 is formed as a hollow portion 2b along the penetration direction (axial direction).

As shown in FIGS. 1 to 3 , the cooling device 1 includes a conveying device 4 that conveys the wire coil 2 placed on the tray 3 in a predetermined direction, and a pair of partition walls 5 (see FIG. 3 ) that Opposite surfaces equally separated from the conveying device 4; a door opening and closing mechanism 7, which together with a pair of partition walls 5 forms a cooling chamber 6; a suspension support body 8, which is suspended above the cooling chamber 6; a cover member 9, which can be It is installed in the suspension support body 8 so as to move in the vertical direction; The vertical movement of the covering member 9 is guided by the suspension support body 8 .

The conveying device 4 includes a pair of frames 4a, which are provided in a direction orthogonal to the conveying direction (hereinafter referred to as the conveying direction) so as to face each other and at intervals along the direction in which the wire coil 2 is conveyed (hereinafter referred to as the conveying direction). is an orthogonal direction); a plurality of rollers 4b, which are hung between a pair of frames 4a; and a blocking plate 4c, which is provided between the rollers 4b.

The plurality of rollers 4b are arranged in the conveyance direction at intervals and at equal intervals, and are respectively rotatably provided on the pair of frames 4a. The partition walls 5 are provided along each of the pair of frames 4a, and face each other in the orthogonal direction.

The door opening and closing mechanism 7 includes a pair of doors 7a, 7b, which are provided on the conveying device 4 so as to be able to rise and fall, and are provided in the conveying direction at a distance from each other, and a door guide 7c, which is provided on the partition wall 5, And guide each door 7a, 7b; and lift device (not shown), it can lift each door 7a, 7b individually.

Each of the doors 7a and 7b has a planar shape along the orthogonal direction, and is provided so as to face each other in the conveying direction. A pair of doors 7a, 7b are spaced so that a plurality of (four in this embodiment) rollers 4b are arranged therebetween, and the doors 7a, 7b are arranged so as to be raised and lowered on the respective blocking plates 4c.

The door guides 7c for guiding the doors 7a, 7b are respectively provided on the mutually facing surfaces of the pair of partition walls 5 along the vertical direction, and the mutually facing sides have open grooves. Both ends of the doors 7a and 7b in the orthogonal direction are inserted into the grooves of the door guide 7c, and the doors 7a and 7b are guided in the vertical direction by the door guide 7c.

A region partitioned by a pair of partition walls 5 and a pair of doors 7a and 7b on the conveying device 4 becomes the cooling chamber 6 in a state in which the doors 7a and 7b are lowered.

Below the cooling chamber 6, the ventilation hole 10a with a diameter smaller than the inner diameter of the hollow part 2b of the wire coil 2 is arrange|positioned at the center in the conveyance direction. The ventilation hole 10a is located in the approximate center of the cooling chamber 6, and is provided between the adjacent rollers 4b and at a position lower than the height of the top of the rollers 4b. The air supplied from the blower (not shown) is blown upward from the blower hole 10a.

The blocking plate 4c provided between the rollers 4b is provided between the rollers 4b so as to block at least the area below the cooling chamber 6 between the plurality of rollers 4b. At this time, the blocking plate 4c is not provided above the ventilation hole 10a located in the center of the cooling chamber 6 . The blocking plate 4c is arranged so that its upper surface is lower than the height of the top of the roller 4b.

As shown in FIG. 4, the tray 3 for placing the wire coil 2 is formed of a rectangular plate-like material, and an opening 3a is formed in the center of the tray 3, and the opening 3a is smaller than the size of the wire coil 2 to be placed. The inner diameter of the hollow portion 2b is larger than the inner diameter of the ventilation hole 10a. As shown in FIG. 3, the tray 3 conveyed to the cooling chamber 6 is arrange|positioned so that the ventilation hole 10a may be located inside the opening 3a when it planarly views from above. The air from the ventilation hole 10a flows through the opening 3a.

In the case of using the blocking plate 4c, the tray 3 is formed, for example, in a light-weight lattice shape. The blocking plate 4c may be omitted, and in this case, as in the modification shown in FIG. 8, the tray 3 is formed of a plate having only the openings 3a. Such a configuration is made so that the air from the blowing hole 10a can be supplied to the wire coil 2 without waste. If there is a blocking plate 4c, the tray 3 may not be used.

The suspension support body 8 is provided with: a suspension frame 12 suspended from above by a wire 11; .

The suspension frame 12 is suspended by the wire 11 via the pulley 14 arranged above. The wire 11 is redirected by the pulley 14, and is wound up and lowered by the winch 15 provided on the side.

The suspension frame 12 is formed in, for example, a flat rectangular shape, and is suspended so as to face the tray 3 arranged in the cooling chamber 6 at a distance in the up-down direction.

The rods 13 have a cylindrical shape, and are vertically installed at four corners of the suspension frame 12 along the vertical direction. The rod 13 is slidably inserted through the cover member 9 , whereby the cover member 9 is guided by the rod 13 so as to be movable in the vertical direction.

The lower end of the rod 13 is provided with a stopper 13 a for restricting the downward movement (disengagement) of the cover member 9 .

The cover member 9 is provided with the cover plate 9a formed in the substantially same planar rectangular shape as the suspension frame 12, and the buffer material 9b provided in the lower surface of the cover plate 9a.

The four corners of the cover plate 9a are provided with through holes 9c through which the rods 13 of the suspending support body 8 are inserted.

The buffer material 9b is formed by, for example, overlapping and attaching a plurality of copper meshes. The buffer material 9b should just be an elastic member which has heat resistance. Thereby, the surface of the upper end 2c of the wire coil 2 can be prevented from being damaged by the vibration of the cover plate 9a at the time of air blowing, or the like.

As shown in FIG. 2 , the cooling device 1 is in a state before the wire coil 2 is transported into the cooling chamber 6, and the suspension support body 8 is located at a position (pulled-up position) pulled up, and the cover member 9 itself The weight of the rod 13 is located on the lower end side of the rod 13 and abuts against the stopper 13a.

When the suspension support body 8 is in the pulled-up position, the cover member 9 abutting against the stopper 13 a is suspended at a position higher than the maximum height at which the wire coils 2 can be stacked in the cooling chamber 6 .

The suspension support body 8 can descend to a preset descending position. The lowering position is a position where the lower surface of the stopper 13 a is higher than the upper surface of the tray 3 placed on the conveying device 4 and does not contact the tray 3 when the suspension support 8 is lowered.

In the state where the wire coil 2 is not placed on the tray 3, the lower surface of the covering member 9 abutting on the stopper 13a of the suspension support body 8 lowered to the lowered position, for example, is arranged on the wire with the lowest height The position where the height of the upper end is lower when the roll 2 is placed on the tray 3 .

Next, the operation of the cooling device 1 of the present embodiment will be described. In the case of cooling the wire coil 2 by the cooling device 1, first, the suspension support body 8 is arranged at the pulled-up position, and at least the inlet-side door 7a on the upstream side in the conveying direction is pulled up by The conveying device 4 moves the wire coil 2 placed on the tray 3 to the position of the cooling chamber 6 .

After moving the wire coil 2 to the position of the cooling chamber 6, as shown in FIG. 1, a pair of doors 7a and 7b are lowered.

In this way, the cooling chamber 6 is formed, and the wire coil 2 is placed on the tray 3 in the cooling chamber 6 . At this time, the wire coil 2 is arranged on the tray 3 in advance so as to surround the opening 3a, and the tray 3 after the movement is arranged at a position facing the covering member 9 located above. In this state, the opening 3a of the tray 3 is located above the ventilation hole 10a.

Next, the suspension support body 8 is lowered to the lowered position. At this time, the suspension support body 8 is lowered from above the wire coil 2 on the tray 3 , and the cover member 9 is placed on the upper end 2 c of the wire coil 2 before the suspension support body 8 is lowered to the lowered position. Thereby, the buffer material 9b comes into contact with the upper end 2c which is one side of the wire coil 2, and the entire area on the wire coil 2 is covered by the covering member 9. As shown in FIG. That is, the covering member 9 abuts on the upper end 2 c in the penetrating direction of the wire coil 2 , and covers the wire coil 2 .

Then, by further lowering the suspension support body 8, as shown in FIG. 1, the cover member 9 is separated from the stopper 13a, and the suspension support body 8 is lowered to the lowered position.

When cooling a plurality of wire coils 2 , as shown in FIG. 5 , the positions of the individual wire coils 2 are aligned and stacked on the tray 3 so that the hollow portions 2 b are continuous.

The stacking height (the number of stacks) of the wire coils 2 stacked on the tray 3 is different every time. Even when the upper ends 2c of the plurality of wire coils 2 to be stacked are covered with the covering member 9, the suspending support body 8 pulled up is lowered. After the covering member 9 is placed on the upper end 2c of the wire coil 2, the rod 13 slides relative to the covering member 9, and the suspension support body 8 is further lowered, and the suspension frame 12 of the suspension support body 8 is stopped at each time. The set drop position.

In a state where the wire coil 2 is arranged in the cooling chamber 6 and the covering member 9 is placed on the wire coil 2 , air is blown out toward the covering member 9 side from the ventilation hole 10 a.

At this time, the weight of the cover member 9 is set so that the cover member 9 does not float due to wind pressure.

The air blown toward the cover member 9 side from the blower hole 10a flows toward the cover member 9 side through the hollow portion 2b as shown by the arrow in the figure. That is, the blown air is blown toward the cover member 9 side to the hollow portion 2b of the wire rod 2 placed on the tray 3, and flows between the wires 2a of the wire rod 2 from the hollow portion 2b, toward the wire rod. The coil 2 flows out from the outer peripheral side, and the wire coil 2 is cooled by the flow of the air.

At this time, a gap C for discharging air upward is provided between the partition wall 5 , the doors 7 a and 7 b , and the cover member 9 .

After cooling, the exit-side door 7 b on the downstream side in the conveying direction is pulled up, and the wire coil 2 is carried out from the cooling chamber 6 together with the tray 3 by the conveying device 4 .

That is, according to the cooling device 1 of the present embodiment, the covering member 9 that abuts on the upper end 2c of the wire coil 2 in the penetrating direction and covers the wire coil 2 is suspended by the wire 11 from above the wire coil 2. Since the rod 13 of the suspended suspension support body 8 is guided to move in the vertical direction, the suspension support body 8 can be moved in the vertical direction in a state where the suspension support body 8 is suspended by the wire 11 and stopped.

Therefore, even if the position (height) blocked by the covering member 9 changes due to, for example, a difference in the number of stacks of the wire coils 2, the wire 11 for suspending the suspension support 8 does not loosen.

That is, when the wire 11 is wired to the pulley 14 , as shown in FIG. 6 , when the suspension frame 12 is used as a covering member and the wire 11 is directly suspended, there is a possibility that the suspension frame 12 has a load on the suspension frame 12 . After being placed on the wire coil 2 , the metal wire 11 will loosen, and the metal wire 11 will be detached from the pulley 14 if care is not taken.

In the cooling device 1 of the present embodiment, since the covering member 9 slides relative to the rod 13 of the suspension frame 12, the length of the wire 11 should be in a straightened state at the predicted highest position of the wire coil 2. way to decide.

Thereby, the suspension frame 12 is continuously lowered, and after the covering member 9 is placed on the upper end 2 c of the wire coil 2 , the suspension frame 12 of the suspension support body 8 can continue to be lowered regardless of the stacking height of the wire coil 2 , all can stop when the metal wire 11 is taut, there is no situation that the metal wire 11 is separated from the pulley 14 , and the problem of hanging operation can be eliminated.

Therefore, regardless of the number of the stacked wire coils 2 , the wire 11 suspending the covering member 9 blocking the upper end 2 c of the wire coil 2 from above via the pulley 14 can be prevented from coming off the pulley 14 .

Since the wire coil 2 is placed on the tray 3 and is conveyed on the plurality of rollers 4b arranged at intervals in the conveying direction, the wire coil 2 can be maintained in a posture in which the penetration direction faces the vertical direction. It can be easily transported in the state.

Since the blocking plate 4c is provided between the rollers 4b for conveying the wire coil 2, the air blown toward the hollow portion 2b can be prevented from leaking toward the lower side of the roller 4b, and it can be fed into the wire coil 2 without wasting air. side. Therefore, cooling can be performed efficiently.

Since the tray 3 is provided with the opening 3a through which the air blown out from the blowing hole 10a circulates, by arranging the cavity 2b of the wire coil 2 in accordance with the opening 3a, the air can be reliably fed into the cavity 2 of the wire coil 2 2b, while cooling is performed efficiently.

A modification of the above-described embodiment is shown in FIG. 7 . The surface of the upper end 2c of the wire coil 2 is not necessarily a horizontal flat state, but may be inclined. In this modification, even if the surface of the upper end 2c of the wire coil 2 is inclined as described above, the covering member 9 can be provided thereon in an inclined state, and the upper end 2c of the wire coil 2 can be appropriately blocked.

First, the hole diameter of the insertion hole 9 c of the cover member 9 is formed to be larger than the outer diameter of the rod 13 . Thereby, the inclination of the cover plate 9a relative to the rod 13 is allowed, and the cover plate 9a can be disposed on the upper end 2c of the wire coil 2 in accordance with the inclination of the surface of the upper end 2c.

In addition, it is preferable to form the upper surface of the stopper 13a of the rod 13 in a tapered shape that narrows upward, and the insertion hole 9c itself is formed into a tapered shape that expands downward, or in the lower part of the insertion hole 9c. The same tapered guide member 16 is installed.

Thereby, when the suspension support body 8 rises, the stopper 13a will enter the insertion hole 9c or the guide member 16, so that the cover member 9 can be returned to a horizontal position, and the cover member 9 can be lifted by centering.

Even in such a modified example, the same effects as those of the above-described embodiment can of course be exhibited. As described above, even if the surface of the upper end 2c of the wire coil 2 is inclined, the covering member 9 can be appropriately provided to efficiently cover the wire coil. 2 to cool down.

In the present embodiment, the upper part is opened to the atmosphere in order to discharge the hot air after cooling. However, as in Citation 5, a ceiling wall may be provided to surround the whole, and the doors 7a and 7b may be opened and closed to carry the wire coil 2 in. Take out, and use the circulation path to cool the hot air, or set the discharge port on the top wall.

Moreover, like the modification of FIG. 8, the partition wall 5 and the doors 7a and 7b may not be provided. However, if the partition wall 5 and the doors 7a and 7b are provided, since the hot air blown from the circumference of the wire coil 2 during cooling will not be blown to surrounding objects or people, the operation can be performed safely.

If the tray 3 is formed in a lattice shape, the weight can be reduced, and the necessary driving force of the conveying device 4 can be reduced.

In the above-described embodiment, the covering member 9 has been described by taking the example in which the buffer material 9b is provided on the lower surface of the covering plate 9a, but the covering member 9 does not necessarily need to include the buffer material 9b.

In the above-described embodiment, the example in which the tray 3 is formed in a lattice shape has been described, but it is not limited to this, and may be, for example, a plate provided with an opening 3a in the center.

The above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit and explain the present invention. This invention can be changed and improved in the range which does not deviate from the summary, and it is needless to say that inventions equivalent to this are all included in this invention.

1: Cooling device for wire coil 2: wire coil 2a: wire 2b: hollow part 2c: Upper end of wire coil 3: Tray 3a: Opening of the tray 4: Conveying device 4a: Frame 4b: Roller 4c: Blocking plate 5: Partition wall 6: Cooling room 7: Door opening and closing mechanism 7a: Entrance side door on the upstream side of the conveying direction 7b: Exit side door on the downstream side in the conveying direction 7c: Door guide 8: Suspension support body 9: Override components 9a: Overlay 9b: Buffer material 9c: Through hole 10: Air supply pipe 10a: Air supply hole 11: Metal Wire 12: Suspension Frame 12a: Lower surface of suspension frame 13: Rod 13a: Stopper 14: Pulley 15: Winch 16: Guide member C: gap

Fig. 1 is a longitudinal sectional view showing a preferred embodiment of the cooling device for the wire coil of the present invention. FIG. 2 is a longitudinal cross-sectional view showing the cooling device for the wire coil shown in FIG. 1 , before the covering member is placed on the wire coil. Fig. 3 is a plan view showing a conveying device included in the cooling device for the wire coil shown in Fig. 1 . FIG. 4 is a perspective view showing a tray used in the cooling device for the wire coil shown in FIG. 1 . FIG. 5 is a longitudinal cross-sectional view showing a case where the wire coil is stacked and installed higher than that in FIG. 1 . FIG. 6 is an explanatory diagram illustrating a problem in the case where the suspension frame is directly suspended and operated by a wire. Fig. 7 is a longitudinal sectional view showing a modification of the cooling device for the wire coil of the present invention. Fig. 8 is a longitudinal sectional view of the main part showing another modification of the cooling device for the wire coil of the present invention.

1: Cooling device for wire coil

2: wire coil

2a: wire

2b: hollow part

2c: Upper end of wire coil

3: Tray

3a: Opening of the tray

4: Conveying device

4a: Frame

4b: Roller

4c: Blocking plate

6: Cooling room

7: Door opening and closing mechanism

7a: Entrance side door on the upstream side of the conveying direction

7b: Exit side door on the downstream side in the conveying direction

8: Suspension support body

9: Override components

9a: Overlay

9b: Buffer material

9c: Through hole

10: Air supply pipe

10a: Air supply hole

11: Metal Wire

12: Suspension Frame

12a: Lower surface of suspended frame

13: Rod

13a: Stopper

14: Pulley

15: Winch

C: gap

Claims (3)

A cooling device for a wire coil, characterized in that it has: a covering member that abuts on the upper end of the wire coil in the penetrating direction to cover the wire coil; an air blowing hole, which is arranged on the lower end side of the wire coil in the penetrating direction, and blows air toward the cover member side from the inner side of the wire coil; and A suspension support body, which is suspended by a metal wire from above the wire coil via a pulley, and can support the covering member; The suspension support body has a guide portion that can guide the covering member to move up and down, The above-mentioned wire coil is conveyed on a plurality of rollers arranged in a predetermined direction at a distance from each other. A cooling device for wire coils as claimed in claim 1, wherein, The wire coil is placed on a tray and conveyed on the roller, and the tray is provided with an opening through which the air blown from the ventilation hole circulates. A cooling device for wire coils as claimed in claim 1 or 2, wherein, A blocking plate is provided between the plurality of rollers.

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