CN1399695A - Method and device for oil evacuation from shoe press unit - Google Patents

Abstract

The invention relates to a device and a method for oil evacuation from a shoe press unit, which shoe press unit comprises a beam (1), a shoe element (2) arranged movably on said beam (1) by means of a pressing unit (3, 5) and having a pressing surface (21), an oil evacuation arrangement (4) with at least one inlet opening (41) which is moved with the shoe element (2), a number of evacuation ducts (48) and an outlet pipe (49), and also a flexible belt (6) interacting with said shoe element (2), oil being supplied during operation to lubricate between said pressing surface (21) and said belt (6), an oil excess with kinetic energy being pressed out at an upstream edge region (21A) of said pressing surface (21), and an oil excess being evacuated from said shoe press unit by said oil evacuation arrangement (4), in which said inlet opening (41) is arranged in such a manner in a container (43A, 43B, 44, 45, 46) connected firmly to the shoe element (2) that a large part of said oil excess is squirted directly into said inlet opening (41), said outlet pipe (49) is connected firmly to said beam (1), and at least a first part of said evacuation duct (48) is arranged movably in relation to said outlet pipe (49).

Description

Method and apparatus for draining oil from a shoe press assembly

technical field

The invention relates to a method for draining oil from a shoe press assembly comprising a beam, a shoe movably arranged on said beam by a press assembly, and There is a pressing surface, an oil drain having at least one inlet, a plurality of oil drain pipes and an outlet pipe, and a flexible belt interacting with said shoe. During operation, oil is fed between the press surface and the belt to lubricate them, excess oil with kinetic energy is pressed out at an upstream edge region of the press surface, and excess oil passes through the drain The oil means is drained from the shoe press assembly and at least some of the excess oil is sprayed directly into the inlet. The invention also relates to a device for a shoe press assembly.

Background technique

Methods and apparatus for a shoe press assembly as described above in the technical field are known from earlier eg US Pat. No. 5,935,385. In order to reduce the friction and thus the heat generated between the belt and the shoe, during operation oil is fed between the pressing surface and the belt to lubricate and cool them. The excess oil is squeezed out at an upstream edge region of the press surface (on the inlet side of the belt) and the excess oil is drained from the shoe press assembly by an oil drain. According to US Pat. No. 5,935,385, the inlet of the oil drain device is arranged on the beam and has a certain distance from the shoe. Therefore, the drain device cannot move together with the shoe.

During the shoe press operation, excess oil is pressed out of the junction area formed between the edge area of the press surface and the belt. If the shoe press has an oil drain with an inlet located in a region other than the region where the direct oil injection occurs during operation, the kinetic energy present in the oil can never be utilized. Oil may accumulate inside the shoe press assembly if the oil drain is not provided with a mechanism to prevent the oil from flowing in different directions. This in turn causes the oil and air that accumulates inside the shoe press assembly to mix, which makes draining the oil more difficult, and means that additional adjustments must then be made to separate the air from the oil before it can be used again come out. Additionally, heat may be released from pressing excess oil before the oil is drained, which would result in an undesirable temperature increase within the shoe press assembly. From an economical operating point of view, the presence of oil accumulation inside the shoe press assembly is undesirable because it requires increased input power.

Contents of the invention

It is an object of the present invention to eliminate or at least reduce one of the above-mentioned drawbacks by a method for draining oil from a shoe press assembly. Wherein, the shoe-shaped pressing assembly includes a beam, a shoe-shaped member, which is movably arranged on the beam through a pressing assembly and has a pressing surface, and an oil draining device, and the oil draining device has at least one An inlet movable with the shoe, drain pipes and an outlet pipe, and a flexible belt interacting with the shoe. During operation, oil is fed between the press surface and the belt to lubricate them, excess oil with kinetic energy is pressed out at an upstream edge region of the press surface, and excess oil passes through the oil drain A device is drained from the shoe press assembly. It is characterized in that said inlet is arranged in a container tightly connected to the shoe in such a manner that a large amount of said excess oil is sprayed directly into said inlet, said outlet pipe is firmly connected to said On the beam, at least a first portion of the drain pipe is movably arranged relative to the outlet pipe.

The present invention has many advantages. Firstly, the location and arrangement of the inlet means that the large amount of kinetic energy present in the pressed oil is useful for the relief of excess oil; secondly, the structure of the oil relief device results in more effective relief; thirdly, The invention makes it possible to keep the temperature in the shoe press assembly at a low level, because a large amount of hot oil is released inside the shoe press assembly without having time to release its heat; This will reduce energy consumption during the operation of the shoe press assembly because no or only a minimal amount of excess oil will accumulate inside the shoe press assembly.

The method according to the invention also comprises further features:

- said oil drain pipe comprises a first pipe portion tightly connected to said device having an inlet, preferably this pipe portion is substantially rigid.

- the pipe portion is movably arranged inside a through hole in the beam and has a sufficient length to protrude from the other end of the through hole.

- The end of the movable tube portion is arranged movably in a sealed manner relative to the outlet tube.

- The sealing is provided using a flexible mechanism, preferably a rubber bellows.

- One end of said flexible mechanism is connected to said movable pipe part and its other end is connected to a second pipe part tightly arranged on said output pipe.

- The shoe press assembly comprises a hermetic shoe press provided with an internal high pressure of between 10-500 mbar, preferably below 200 mbar, more preferably below 50 mbar.

- The outlet pipe is connected to a low pressure application from the outside of the shoe press, for the purpose of making it easier to drain the excess oil.

The invention also relates to a device for a shoe press assembly, wherein the shoe press assembly comprises a beam, a shoe movably arranged on said beam by a press assembly, and having A pressing surface comprising an upstream edge region, an oil drain having an inlet fixedly arranged relative to the shoe, a plurality of oil drain pipes and an outlet pipe, and with the shoe A flexible strap that interacts. It is characterized in that said inlet is arranged in a container firmly connected to the shoe in such a manner that a large amount of said excess oil is sprayed directly into said inlet, said outlet pipe is firmly connected to said A portion of at least one oil drain pipe is movably disposed relative to the outlet pipe on the beam.

The device according to the invention also comprises further features:

- said device having an inlet arrangement is in the form of a container to which the movable part of said drain pipe is firmly connected in a sealed manner, and which preferably contains on all sides and bottom a surrounding wall pieces.

- The movable part of said drain pipe interacts with a sealing mechanism forming a substantially sealed connection between said inlet and said outlet pipe.

- said sealing mechanism comprises a flexible tube, preferably a rubber telescoping tube, one end of which is sealingly connected to the periphery of said movable part of the drain pipe and the other end of which is connected firmly to said outlet pipe on the attachment.

- said accessory comprises a tubular connection, preferably a metal tube, which is connected in sealed form to said output tube.

- Said movable part of the oil drain pipe interacts directly at its end through its outer surface with a sealing mechanism, preferably comprising at least one O-ring, arranged on the inlet side of the oil drain pipe.

- said sealing mechanism consists of two tubes, telescopically arranged partial pieces interacting in a sealed form.

- The area between the lower limit surface of the inlet and the shoe is provided with guard means, which preferably extend substantially in a rectilinear direction.

- The shortest distance between the upper surface of the inlet and the inner surface of the belt is between 0-10mm, preferably less than 5mm.

- said container extends in the longitudinal direction to a length comprised between 500-1500 mm.

- The diameter of the first oil drain pipe is between 30-100mm, preferably 50-70mm.

- At least two such containers are arranged adjacent to each other inside said shoe press assembly.

Description of drawings

The present invention will be described in more detail below in conjunction with accompanying drawing, wherein accompanying drawing is:

Figure 1 is a cross-sectional view of a preferred embodiment of the present invention.

Figure 2 is a partial cross-sectional view of the preferred embodiment of the present invention disposed within a closed shoe press assembly.

Figure 3 is a perspective view of a preferred assembly in accordance with the present invention.

Fig. 4 is a sectional view of another embodiment of the oil drain pipe according to the present invention.

Detailed ways

Figure 1 shows the principle of a shoe press assembly according to the invention in a sectional view. From known principles per se, the shoe press assembly consists of a support beam 1 in which recesses are provided to receive a press assembly 3 , 5 for a shoe 2 . The pressing assembly 3, 5 itself comprises in a known manner a hydraulic piston, which is arranged in a sealed manner inside a hydraulic cylinder 5, so that the shoe 2 can be moved in a direction perpendicular to the longitudinal extension of the shoe 2. Hydraulically driven back and forth. A support seat 9 is arranged on a short end of the shoe-shaped part 2 . An endless flexible belt/cover 6 is itself arranged in known manner so that it interacts with a pressing surface 21 of the shoe 2 via its one side surface 6A, and with its other side surface 6B and an opposing roller 10 interactions. As shown in the figure, the endless belt 6 rotates in the counterclockwise direction, therefore, the support base 9 is arranged at the downstream end of the shoe 2 . Arranged on the left in the figure at the upstream end of the shoe is a distribution chamber 7 which supplies oil to the pressing surface 21 via a delivery pipe 71 in a known manner. Simultaneously also shows an oil discharge device 4, and it comprises an inlet 41 that is arranged on a trough container (seeing Fig. 3), a first oil discharge pipe 48A, a rubber expansion tube 48C, an upper connecting pipe 48B, And an output pipe 49. It can be clearly seen that the rubber telescoping tube can provide good flexibility in multiple directions, not only for vertical movement between the two tubes 48A and 48B, but also for possible movement under certain operating conditions. Deviating from or departing from its cross-sectional direction at an angle. The two tubes 48A and 48B are suitably made of a dimensionally stable material, such as a metallic material, so that they cannot be compressed by external high pressure. It is also shown in Figure 1 that the shoe press assembly is provided with a second oil drain means 11 adapted to serve as an oil drain system in the event of a stoppage of operation. It is also shown that the shoe press assembly is provided with a belt guide 12 mounted on a support plate 13, the purpose of which is to facilitate the installation and removal of the belt/overcoat 6.

Figure 2 shows in more detail a portion of a shoe press assembly according to the invention. According to the preferred embodiment shown, it can be seen that the shoe 2 is designed symmetrically in each edge region of said pressing surface 21 . Marked at the upstream end of the shoe 2 is an edge zone Z ₁ -Z ₂ which constitutes the zone of a convex surface 21A. It can be seen that the extension L of this edge region is relatively short relative to the concave portion 21 of the pressing surface. In this edge region 21A there is a line X which produces the first contact between the belt 6 and the pressing surface 21 of the shoe.

Set on the distribution chamber 7 is the lower part of the oil drain device 4 , which further includes a guide plate 42 , a container 45 , 44 , 46 , 43A, 43B, an oil drain pipe 48 and a grooved inlet 41 . The container comprises a first longitudinal wall member 45, a flat bottom wall 44, a second longitudinal wall member 46 and two end walls 43A, 43B. The upstream longitudinal wall member 46 is divided into a lower wall member 46A and an upper wall member 46B. The lower wall part 46A is arranged at an acute angle with the bottom wall 44 and the plane P containing the bottom surface 44, according to the preferred embodiment, this angle x is about 60-70, and the upper wall part 46B is arranged at a smaller acute angle with respect to said plane P. In this way, the upper wall part 46B presents an inclination of only a small degree to the tangent to the belt 6 in the region of said upper wall part 46B, so that the upper part converges slightly towards the inner surface of the belt. The end 41B of the upper wall part forms the upper limit surface of the inlet 41, and it is very advantageous if the upper limit surface 41B is located at a position close to, or even in contact with, the inner surface of the belt 6, thus forming as much as possible between them. small gaps. The downstream wall element 45 is also arranged at an acute angle with respect to said plane P, and according to the preferred embodiment it forms an angle β which is substantially the same as the angle x of the other wall element 46A. End walls 43A and 43B are provided at each short end of the container, and the lower limit surface 41A of the inlet 41 is formed by the upper end of the downstream longitudinal wall member 45 . All parts forming the container are made of thin metal sheet, preferably 2mm thick. Extending vertically from said lower limit surface 41A and up to the shoe is a guide plate 42, also made of sheet metal, and adapted to be made of the same sheet metal as the container, The container is formed by first suitably stamping and forming the sheet metal and then bending it into the desired final shape, after which the end walls 43A and 43B are joined in sealed form (suitably by welding) to the bent parts . A circular hole 44A is provided on the bottom surface of the container, on which an oil drain pipe 48A is provided in a sealed form (suitable for welding). The container is secured to the dispensing chamber 7 by means of a screw connection 50 which in turn is connected (usually screwed) to a longitudinal side wall 23 of the shoe. Thus, the drain device 4 is fixed firmly to the shoe so that they can move as a unit. For the purpose of enabling the movement of the shoe and oil drain device 4, there is a recess 1A in the support beam 1, in which the oil drain pipe 48A can freely move up and down.

As already mentioned above, the oil drain device 4 is arranged on the position of the upper limit surface 41B of the inlet 41 quite close to the surface of the belt, so that the distance S between them during operation is small enough to prevent the leakage between the inlet 41 and The distance S should preferably not allow more than 10 mm for a large amount of oil spillage between the belts 6 . The inlet 41 should further be located in such a position that a large amount of excess oil that is pressed out can be sprayed directly into the inlet 41 . According to the preferred embodiment, due to the above structure, the tangent Tx of the convex surface at the contact line X between the belt 6 and the shoe 2 will extend between the lower limit surface 41A and the upper limit surface 41B. In this case, a geometry should be provided between the edge region 21A and the inlet such that the tangent Tx of the contact line X (which can be considered as the excess oil ejected usually in a divergent form A representation of a central flow direction) is located, from an imaginary straight line Y1 extending between the contact line X and the lower limit surface 41A of the inlet 41, or an imaginary straight line extending between the contact line X and the upper limit surface 41B of the inlet 41 At least one of Y2 deviates by a maximum of 15. Furthermore, the inlet 41 should be located close to the upstream edge area 21A, suitably between 10-150 mm, and more preferably at a maximum of 100 mm from the edge area 21A.

The device shown in Figures 1 and 2 has functions in the following form. When starting to operate the machine, the inner surface of the belt bears a thin layer of oil, which serves to lubricate between the belt 6 and the pressing surface 21 of the shoe 2, but also to cool the shoe pressing assembly. The oil supplied usually occurs at several different locations, notably through the distribution chamber 7 to lubricate the central area of said pressing surface 21 (see FIG. 1 ), and also usually directly at least somewhere on the inner surface of the belt. In other respects, the shoe press assembly itself operates in a known manner, the shoe 2 exerting pressure via the press assemblies 3, 5 against a counter-roll 10 in order to subject the web located therebetween to Desired treatment, such as dehydration treatment. In this connection, excess oil supplied with the belt 6 to the upstream end of the shoe will be forced out of the joint zone formed between the inner surface 6A of the belt and the upstream edge region 21A of the shoe. The excess oil O acquires kinetic energy in this way and is sprayed into the inlet 41 in the direction opposite to the direction of belt movement to be collected in the containers 43A, 43B, 44 , 45 , 46 . When using a closed shoe press assembly, due to the slight high pressure inside the shoe press assembly, the oil collected in the container will be forced out through the first part 48A of the drain pipe, through the rubber bellows 48C and through the connecting pipe 48B, into the output pipe 49, and finally to a collection container (not shown). In certain applications, the output line is connected to a low pressure to ensure proper oil drainage. Typically a closed shoe press assembly is used with an internal high pressure of less than 50 mbar.

A portion of the oil will not be carried away but will flow along the surface of the shoe edge region 21A down the end wall 23 of the shoe. However, due to the action of the guide plate 42 pressed against the end wall 23 of the shoe, this part of the oil will also be directed into the inlet 41 . In the embodiment shown in Figure 1, in such a connection, gravity will assist the flow of this additional oil into the container. It should however be pointed out that this is not essential, since a low pressure can be produced in the area adjacent to the inlet 41, so that such an influx of excess oil can be produced even without the influence of gravity. The fact that the oil drain pipe 48A is arranged vertically in the oil drain arrangement does not thereby constitute a limitation of the invention shown.

FIG. 3 shows the above-mentioned containers 43A, 43B, 44, 45, 46 integrally formed with a deflector plate 42 and drain pipe 48A in a perspective view. It can also be seen that the guide plate 42 is provided with a plurality of holes 47 for installing the fixing screw 50 . Since the oil drain is preferably disconnected, in this case a plurality of containers of limited length are arranged adjacent to each other on the shoe 2, preferably with an inlet 41 of each container extending along the entire width of the container , is always set ideally with respect to the spray oil, irrespective of the inclination of the beam 1. According to a preferred embodiment, each container is approximately 1 meter in length. The length of the container should not be less than 500mm or not more than 1500mm to obtain the best discharge function. For the same reason, the diameter of the drain pipe should not be too small, suitably around 60mm. The diameter should preferably not be less than 10 mm and not exceed 50 mm.

Figure 4 shows a first alternative embodiment in accordance with the present invention in which a drain pipe 48 is provided with two telescoping portions 48A and 48B. The first portion 48A of the drain tube provides a relatively larger diameter D1 in this connection, while the second portion 48B of the drain tube provides a relatively smaller diameter D2. The two tubular portions are arranged to overlap each other by a substantial length 1 in the rest position, which length is preferably at least as large as the diameter of the first tubular portion 48A. According to the preferred embodiment, disposed in the annular gap 60 formed between the overlapping tubes is a seal 61 secured to the end of the second tube portion 48B. It is thus possible to move between this seal 61 and the first tube portion 48A, the sliding taking place in the cylindrical contact area 62 between the seal 61 and the inner surface of the first tube portion 48A.

According to another alternative embodiment of the present invention, the oil drain pipe 48A fixed on the container should be long enough so that the inlet 49A of the outlet pipe 49 can enter its interior. In this case, seals such as one or more O-rings are provided directly in the inlet 49A of the outlet tube 49, these seals interacting directly with the outer surface of the drain tube 48A. Since the outlet pipe 49 can be made of a larger diameter pipe, suitable between 100-200 mm, the end of the drain pipe 48A can move freely inside the outlet pipe 49 because the maximum stroke length of the shoe 2 Usually no more than 50mm, usually between 20-35mm.

In many applications, it is very important if the sealing connection between the first pipe portion 48A and the adjacent portion of the oil drain device is flexible in multiple directions so that the connection is also flexible in the transverse direction. Advantageous; because during operation, there is a possibility of causing some lateral movement of the shoe by lateral force and/or thermal deformation, and the first tube portion 48A must be able to follow this movement without complicated Danger.

The invention is not limited to what has been disclosed above, but various modifications can be made within the scope of the following claims. It is therefore clear that, for example, the oil drain can be made of many other materials than sheet metal, such as a polymer material; it can also be clearly seen that the inlet 41 of the oil drain can be separated (for example due to strength reason) to form a plurality of enlarged or reduced extension openings adjacent to each other; it is also clear that the components of the oil drainage device do not have to be made of the same material, it can be made of a variety of different components/ It is self-evident to those skilled in the art that they can be arranged/connected to each other in other ways; it can also be clearly seen that the oil drainage device is arranged in one place only for demonstration purposes. On the distribution chamber, the oil drain device can of course be arranged directly on the shoe 2 , for example along its side surface 23 . Furthermore, it is also clear that the container may comprise a device different from the above design, for example with a considerably smaller "container space" and/or with a completely different cross-sectional shape (e.g. oval), as long as it is in accordance with the The space available in the intended shoe press will suffice; it is also clear that other means than the rubber bellows 48C can also be provided as a flexible part, i.e. a seal between the two pipes in the oil drain Connections, such as fibre-reinforced flexible materials and impermeable polymeric materials other than rubber, or liquid-impermeable textile materials.

Claims (20)

1, a kind of being used for from the method for shoe type press assembly draining, wherein, the shoe type press assembly comprises a beam (1), one shoe shape part (2), this shoe shape part is by a press unit (3,5) being arranged on described beam (1) movably goes up and has a press surface (21), one drainage device (4), this drainage device have at least one can and the inlet (41) that moves together of shoe shape part (2), a plurality of drain masts (48) and an efferent duct (49), and with the interactional flexible belt of described shoe shape part (2) (6), during operation, oil is fed between described press surface (21) and the described belt (6) to lubricate them, excessive oil with kinetic energy is squeezed out in a upstream edge zone (21A) of described press surface (21), and excessive oil is released out from described shoe type press assembly by described drainage device (4), it is characterized in that, described inlet (41) is arranged on a container (43A who tightly is connected on the shoe shape part (2) with such form, 43B, 44,45,46) in, promptly a large amount of described excessive oil directly spray in the described inlet (41), described efferent duct (49) is connected on the described beam (1) securely, and the first of described at least drain mast (48) is provided with movably with respect to described efferent duct (49).

2, method according to claim 1 is characterized in that, described drain mast (48) comprises first a pipe portion (48A) that tightly is connected on the described inlet (41), and preferably, this pipe portion is rigidity substantially.

3, method according to claim 2 is characterized in that, described pipe portion (48A) is arranged on the inside of the last through hole of beam (1) (1A) movably, and has enough length to stretch out the other end of described through hole (1A).

4, method according to claim 3 is characterized in that, the end of described movable pipe portion (48A) is provided with respect to described efferent duct (49) movably with the form of sealing.

5, method according to claim 4 is characterized in that, uses a compliant mechanism (48C) that described sealing is provided, preferably rubber bellows.

6, method according to claim 5 is characterized in that, an end of described compliant mechanism (48C) is connected with described movably pipe portion (48A), and its other end is connected with the second pipe portion (48B) on tightly being arranged on described efferent duct (49).

7, method according to claim 1 is characterized in that, described shoe type press assembly comprises a sealing shoe type press device that provides internal high pressure, and described internal high pressure is preferably lower than 200mbar between 10-500mbar, more preferably be lower than 50mbar.

8, method according to claim 7 is characterized in that, described efferent duct (49) is connected to a hypotensive effect place in the shoe type press device outside, so that the easy described excessive oil of must releasing.

9, a kind of device that is used for the shoe type press assembly, wherein, the shoe type press assembly comprises a beam (1), one shoe shape part (2), this shoe shape part is by a press unit (3,5) be arranged on movably on the described beam (1), and has a press surface (21) that comprises a upstream edge zone (21A), drainage device (4) with inlet (41), described inlet (41) securely is provided with respect to described shoe shape part (2), a plurality of drain masts (48) and an efferent duct (49), and with the interactional flexible belt of described shoe shape part (2) (6), it is characterized in that, described inlet (41) is arranged on the container (43A that is fastenedly connected on shoe shape part (2) with such form, 43B, 44,45,46) in, thereby a large amount of described excessive oil directly spray in the described inlet (41), and described efferent duct (49) is connected on the described beam (1) securely, and the part (48A) of at least one drain mast (48) is provided with movably with respect to described efferent duct (49).

10, device according to claim 9, it is characterized in that, described inlet (41) is arranged on a container (43A, 43B, 44,45,46) in, the moveable part (48A) of described drain mast (48) securely is connected on this container in the mode of sealing, and this container preferably includes the wall spare that centers on all sides and bottom surface (44).

11, device according to claim 9, it is characterized in that, the described part (48A) of described drain mast (48) interacts with a sealing mechanism (48C), and sealing mechanism forms the connection of a basic sealing between described inlet (41) and described efferent duct (49).

12, device according to claim 11, it is characterized in that, described sealing mechanism comprises a flexible pipe (48C), rubber bellows preferably, the one end is connected in described moveable part (48A) periphery of drain mast hermetically, and its other end then is connected on the annex (48B) that securely is connected in described efferent duct (49).

13, device according to claim 12 is characterized in that, described annex (48B) comprises a tubular connection, a metal tube preferably, and it is connected on the described efferent duct (49) with the form of sealing.

14, device according to claim 11, it is characterized in that, the described moveable part (48A) of drain mast (48) by its outer surface and a sealing mechanism direct interaction, preferably comprises an O-ring seals in its end at least, is arranged on the entrance side (49A) of drain mast.

15, device according to claim 11 is characterized in that, described sealing mechanism comprises two pipes, they be with the interactional flexible setting of seal form the part part (48A, 48B).

16, device according to claim 10 is characterized in that, provides protection mechanism (42) on the lower limit surface (41A) of inlet (41) and the zone between the shoe shape part (2), and this mechanism preferably extends along rectilinear direction basically.

17, device according to claim 9 is characterized in that, the beeline (S) between the inner surface (6A) of upper limit surface of described inlet (41) (41B) and belt is between the 0-10mm, preferably less than 5mm.

18, device according to claim 10 is characterized in that, the length that described container (43A, 43B, 44,45,46) extends at longitudinal direction is 500 to 1500mm.

19, device according to claim 10 is characterized in that, the diameter of described first drain mast (48A) is 30 to 100mm, is preferably 50 to 70mm.

20, device according to claim 18 is characterized in that, has two such containers (43A, 43B, 44,45,46) at least in the setting that is adjacent to each other of described shoe type press component internal.

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