CN212820491U - Cathode carrier beam and wet-type electric dust collector - Google Patents
Cathode carrier beam and wet-type electric dust collector Download PDFInfo
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- CN212820491U CN212820491U CN202021159509.8U CN202021159509U CN212820491U CN 212820491 U CN212820491 U CN 212820491U CN 202021159509 U CN202021159509 U CN 202021159509U CN 212820491 U CN212820491 U CN 212820491U
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Abstract
The utility model provides a negative pole carrier bar and wet-type electrostatic precipitator, negative pole carrier bar include the roof beam body, and the roof beam body includes roof, bottom plate and locates the bearing structure of roof and bottom plate both sides, has all seted up a plurality of first holes on roof and the bottom plate. The top ends of the cathode lines sequentially penetrate through the first holes in the bottom plate and the top plate and are hung on the bearing beam, and the section of each first hole is in a long strip shape, so that the cathode lines can move left and right in the first holes along the length direction of the bearing beam, the distance between the cathode lines can be accurately adjusted when the cathode lines are installed, and the size error caused by the machining error of the distance between the first holes is made up; and in the cathode ray occasion of different equidistant distribution, after the interval between the first hole is made and confirmed, still can adjust the interval between the adjacent cathode ray in the first hole when the cathode ray is installed, and product adaptability is good.
Description
Technical Field
The utility model relates to an electrostatic precipitator technical field, concretely relates to negative pole carrier bar and wet-type electrostatic precipitator.
Background
The cathode wire of the electric dust collector is connected with high-voltage direct current to ionize, charge and separate dust particles, and finally the purposes of dust collection and dust removal are achieved. And a plurality of cathode wires are hung on the cathode bearing beams, and the cathode bearing beams are fixed on the tower wall on the upper part of the wet electric dust collector in parallel along the chord direction of the wet electric dust collector. In the new unit of thermal power plant at present, because wet-type electrostatic precipitator is cylindrical, the centre is through near the negative pole line carrier bar span of wet-type electrostatic precipitator centre of a circle big.
The middle part of the cathode bearing beam with large span is easy to droop, and the strength and the rigidity are insufficient to stably support the cathode line. The beam cross-sectional shape of negative pole carrier bar is the rectangle, and current carrier bar generally increases the rigidity and the intensity of girder through the cross-sectional area increase of increase carrier bar, and the carrier bar sectional area increase can make its space that occupies in wet-type electrostatic precipitator increase, the anticorrosive material area that needs to scribble establish increase, and the mass transfer area reduces, the resistance increase in the wet-type electrostatic precipitator, leads to dust collection efficiency to descend.
In addition, round small holes are formed in the cathode bearing beam, the cathode wire sequentially penetrates through the round hole in the bottom of the bearing beam and the round hole in the top of the bearing beam, and the threaded structure in the top of the cathode wire extends out of the top of the bearing beam and is fixed on the bearing beam through nuts. In order to meet the requirement of electrostatic dust removal, the cathode lines need to be distributed on the bearing beam at equal intervals, because of processing errors, the intervals among the circular small holes on the bearing beam have errors, and the intervals among the cathode lines need to be manually adjusted when the cathode lines are installed, but the cathode lines are positioned by the circular small holes, and the intervals among the cathode lines are difficult to adjust; and once the distance between the round small holes is determined during manufacturing, the distance cannot be adjusted in the later period, the cathode line can not adapt to the occasions of different equidistant distribution, and the product adaptability is poor.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the present invention is to overcome the defect that the distance between the cathode lines of the cathode carrier bar in the prior art is difficult to adjust.
Therefore, the utility model provides a cathode carrier bar, which comprises
The beam body comprises a top plate, a bottom plate and support structures arranged on two sides of the top plate and the bottom plate, wherein a plurality of first holes are formed in the top plate and the bottom plate and used for hanging and connecting cathode lines in a penetrating manner; the section of the first hole is in a long strip shape.
Optionally, in the cathode carrier bar described above, the first hole is a kidney-shaped hole.
Optionally, the cathode carrier bar further includes a support plate, the support plate is disposed between the two support structures, a second hole for the cathode line to pass through is formed in the support plate, and a cross section of the second hole is in a long strip shape.
Optionally, in the cathode carrier bar described above, the second hole is a kidney-shaped hole.
Optionally, in the cathode carrier bar described above, the top plate and the bottom plate are both flat plates and are parallel to each other.
Optionally, the support plate is parallel to the top plate.
Optionally, in the cathode carrier bar, the height of the bar body is H, the distance between the support plate and the top plate is d, and d is greater than or equal to 1/5H and less than or equal to 1/4H.
Optionally, in the cathode carrier beam described above, the beam body has a rectangular cross section.
Optionally, in the cathode carrier bar described above, a reinforcing plate is disposed on the top plate, a third hole is disposed at a position on the reinforcing plate corresponding to the first hole, and the shape of the third hole is the same as that of the first hole; the head of the cathode line is adapted to be fixed to the top plate.
The utility model provides a wet-type electric dust collector, which comprises a cathode bearing beam and a cathode wire, wherein the cathode bearing beam is fixed on the inner wall of the wet-type electric dust collector; the cathode line is hung on the cathode bearing beam.
The utility model discloses technical scheme has following advantage:
1. the utility model provides a cathode carrier bar, including the roof beam body, the roof beam body includes roof, bottom plate and locates the bearing structure of roof and bottom plate both sides, has all seted up a plurality of first holes on roof and the bottom plate. The top ends of the cathode lines sequentially penetrate through the first holes in the bottom plate and the top plate and are hung on the bearing beam, and the section of each first hole is in a long strip shape, so that the cathode lines can move left and right in the first holes along the length direction of the bearing beam, the distance between the cathode lines can be accurately adjusted when the cathode lines are installed, and the size error caused by the machining error of the distance between the first holes is made up; and in the cathode ray occasion of different equidistant distribution, after the interval between the first hole is made and confirmed, still can adjust the interval between the adjacent cathode ray in the first hole when the cathode ray is installed, and product adaptability is good.
2. The utility model provides a wet-type electrostatic precipitator, the negative pole line in it can move about along carrier bar length direction in the first hole, second hole and the third hole of carrier bar, can accurately adjust the interval between the negative pole line when installing the negative pole line, compensate the dimensional error that each hole interval machining error leads to; and in the cathode line occasion of different equidistant distribution, after the interval between each hole is made and confirmed, the cathode line still can move in each hole when installing in order to adjust the interval between adjacent cathode line, and product adaptability is good.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a cross-sectional view of a cathode ray carrier beam provided in embodiment 1 of the present invention;
FIG. 2 is a top view of a cathode line carrier bar;
FIG. 3 is a schematic view of a flue gas discharge device provided in embodiment 3;
FIG. 4 is a schematic view of the uniform distribution plate of FIG. 3;
description of reference numerals:
101-a top plate; 1011-first hole; 102-a support structure; 103-a backplane; 104-a support plate; 1041-a second well; 105-a stiffener plate; 1051-a third aperture; 1-uniformly distributing plates; 11-a first region; 111-fourth well; 12-a second region; 121-fifth hole; 21-a dust collector body; 22-a reducer section; and 3-a desulfurizing tower.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Example 1
The present embodiment provides a cathode carrier beam, as shown in fig. 1, which includes a beam body and a support plate.
The roof beam body includes roof plate, bottom plate and locates the bearing structure of roof plate and bottom plate both sides, has all seted up a plurality of first holes on roof plate and the bottom plate. The top ends of the cathode lines sequentially penetrate through the first holes in the bottom plate and the top plate to be hung on the bearing beam, and the section of each first hole is in a long strip shape, so that the cathode lines can move left and right in the first holes along the length direction of the bearing beam, the distance between the cathode lines can be accurately adjusted when the cathode lines are installed, and the size error caused by the machining error of the distance between the first holes is made up; and in the cathode ray occasion of different equidistant distributions, after the interval between the first hole is made and confirmed, the cathode ray can also move in the first hole during installation so as to adjust the interval between the adjacent cathode rays, and the product adaptability is good.
Specifically, referring to fig. 2, the first hole is a kidney-shaped hole, two ends of the first hole are arc-shaped, and when the positions of the cathode lines are adjusted to the two ends of the first hole, the cylindrical cathode lines are conveniently matched and abutted on the arc-shaped wall surface of the end portion of the first hole.
The top plate 101 is attached to the top ends of the two support structures 102 and the bottom plate 103 is attached to the bottom ends of the two support structures 102. The top plate 101 and the bottom plate 103 are flat plates and are horizontally arranged, the top plate and the bottom plate are parallel to each other, the supporting structures 102 on the two sides are vertically arranged plate-shaped structures, namely the two supporting structures 102 are side plates, the top plate 101, the bottom plate 103 and the two side plates of the beam body form a rectangular frame-shaped beam body in a surrounding mode, and the threaded structure at the top of the cathode line extends out of the top plate and is fixed on the top plate through nuts.
The support plate 104 is disposed between the two side plates and inside the beam body frame, and a second hole for the cathode wire to pass through is disposed on the support plate, the second hole has a long-strip-shaped cross section, and optimally, the second hole is a kidney-shaped hole, the shape and size of which are the same as those of the first hole, so that the cathode wire can be hooked in the second hole in a penetrating manner and can be moved in the second hole to adjust the distance between the adjacent cathode wires.
The support plate 104 is parallel to the top plate 101. The cross section of the beam body is rectangular, the distance between the top ends and the bottom ends of the two side plates in the vertical direction is H, namely the height of the beam body is H, the vertical distance between the supporting plate 104 and the top plate 101 is d, and d is not less than 1/5H and not more than 1/4H. The moment of inertia of the cross section of the support plate 104 to the x-axis according to the parallel axis shift theorem is:
IX＝IXC+a2A
wherein, IXCThe moment of inertia of the support plate cross section centering axis (the centering axis is the middle line of the beam body perpendicular to the height direction of the beam body), and a is the vertical distance from the support plate cross section centering axis to the centering axis.
The smaller d is, the larger a is, the larger the moment of inertia of the cross section of the support plate 104 to the x axis is, and the larger the integral moment of inertia of the load-bearing beam is, so that the bending resistance of the load-bearing beam is improved and the load-bearing beam is not easy to bend and deform. The support plate 104 is located a distance away from the center line of the beam body and is located closer to the top plate 101 to increase the bending resistance of the load beam. If the support plate 104 is disposed adjacent to the top plate 101, the carrier bar is similar to a rectangular frame, which is easily deformed, resulting in poor integrity and easy deformation of the carrier bar. Therefore, the supporting plate 104 is arranged at the position 1/5H-1/4H away from the top plate 101 by comprehensively considering the deformation and the bending resistance of the carrier beam, so that the bending resistance of the carrier beam can be improved, and the carrier beam is not easy to deform.
When the bearing beam is manufactured, two side plates are firstly taken, and then a supporting plate 104 is welded inside the side plates, and the supporting plate 104 is close to the top plate 101, so that welding construction is facilitated.
When the bearing beam is used, the bearing beam is arranged on the inner wall surface of the wet electric dust collector in a spanning mode, and the top plate 101 is pressed, so that the thickness of the top plate 101 can be larger than that of the bottom plate 103 and the side plates, and the pressure resistance of the top plate 101 is improved; optimally, the bottom plate 103 of the load beam is pulled, and the thickness of the bottom plate 103 can be thickened, for example, the thickness of the bottom plate 103 is the same as that of the top plate 101, so as to improve the tensile property of the bottom plate 103; the thickness of the supporting plate 104 is smaller than that of the side plate, and the thickness of the side plate is smaller than that of the top plate 101 and the bottom plate 103, so that the weight of the bearing beam can be reduced while the rigidity and the strength of the bearing beam are met, and the material cost is saved.
For example, the span of the carrier bar is 28m, the width of the bar section is 260mm, the height of the bar is 720mm, the top plate 101 and the bottom plate 103 are 16mm thick, the side plates are 12mm thick, and the support plate 104 is 10mm thick. Compared with a conventional beam structure, the span height of the bearing beam of the structure is large, and the requirements on rigidity and strength of the bearing beam can be met by adopting a small section size under the condition that the span of the bearing beam is large.
The bearing beam of the structure can prevent the edge part of the beam body from twisting by arranging the support plate 104 between the two side plates; meanwhile, the support plate 104 is supported in the beam body, so that when the span of the carrier beam is large, the overall strength and rigidity of the cathode line carrier beam can be effectively improved under the condition that the beam section is not increased or even reduced, and the cathode line carrier beam can stably support a cathode line; and the beam cross-sectional dimension is little, and the beam width can be narrower, and the space that the carrier bar occupied in wet-type electrostatic precipitator reduces, the mass transfer area increase, the circulation resistance of flue gas in wet-type electrostatic precipitator reduces, and dust collection efficiency improves. The cross section of the beam is small, the anticorrosive material required to be coated on the bearing beam is correspondingly reduced, and the anticorrosive cost is saved.
Referring to fig. 1, a reinforcing plate 105 is welded to the inner wall surface of the roof panel, and since the roof panel 101 is pressed in use, the strength of the roof panel is weakened due to the hole formed therein, and the reinforcing plate is provided to increase the strength and the pressure resistance of the roof panel.
The reinforcing plate is provided with a third hole 1051, which is a kidney-shaped hole and has the same shape and size as the first hole. The first hole, the second hole and the third hole are all waist-shaped holes with the same size, and the first hole, the second hole and the third hole are vertically positioned on the same straight line. During the use, the carrier bar strides and establishes on wet-type electrostatic precipitator internal face, and the top of negative pole line passes first hole on the bottom plate, the second hole in the backup pad, the first hole on third hole and the roof in proper order, and negative pole line top has the screw thread, and the roof upwards stretches out on negative pole line top, and the nut cup joints on negative pole line top screw thread and butt on the roof around first hole to the fixed negative pole line that hangs.
The cathode lines can move left and right in the first hole, the second hole and the third hole along the length direction of the bearing beam, the distance between the cathode lines can be accurately adjusted when the cathode lines are installed, and the size error caused by the machining error of the distance between the holes is made up; and in the cathode line occasion of different equidistant distribution, after the interval between each hole is made and confirmed, the cathode line still can move in each hole when installing in order to adjust the interval between adjacent cathode line, and product adaptability is good.
As a first alternative embodiment of example 1, the thicknesses of the top plate 101, the bottom plate 103, the side plates, and the support plate 104 may be the same as long as the support plate 104 is disposed between the two side plates to improve the rigidity and strength of the load beam as a whole.
As a second alternative of embodiment 1, the supporting structure 102 may also be arranged obliquely, for example, the cross section of the beam body may be trapezoidal, the plates on which the upper bottom and the lower bottom of the trapezoid are located are the top plate 101 and the bottom plate 103, respectively, and the plates on which the two waists of the trapezoid are located are the supporting structure 102.
As a third alternative of embodiment 1, the supporting plate 104 may be disposed near the center line of the beam body, or the supporting plate 104 and the top plate 101 may be disposed between the two supporting structures 102 in a non-parallel and inclined manner, which also can improve the rigidity and strength of the entire load-bearing beam. As a modification, the reinforcing plate may also be provided on the top surface of the top plate, or the reinforcing plate may not be provided.
As a fourth alternative embodiment of the embodiment 1, the cross-sections of the first hole, the second hole and the third hole may be rectangular and long-strip-shaped, as long as the cathode lines are inserted into the first hole and can move in the holes to adjust the spacing between the adjacent cathode lines.
Example 2
The embodiment provides a wet electric dust collector, which comprises the cathode bearing beam and the cathode wire in the embodiment 1. The cathode bearing beam is fixed on the inner wall of the wet electric dust collector; the cathode line is hung on the cathode bearing beam.
In the wet-type electric dust collector with the structure, the support plate 104 is arranged between the two side plates of the inner cathode bearing beam, so that the edge part of the beam body can be prevented from twisting; meanwhile, the support plate 104 is supported in the beam body, so that when the span of the carrier beam is large, the overall strength and rigidity of the cathode line carrier beam can be effectively improved under the condition that the beam section is not increased or even reduced, and the cathode line carrier beam can stably support a cathode line; and the beam cross-sectional dimension is little, and the beam width can be narrower, and the space that the carrier bar occupied in wet-type electrostatic precipitator reduces, the mass transfer area increase, the circulation resistance of flue gas in wet-type electrostatic precipitator reduces, and dust collection efficiency improves.
In addition, the cathode lines of the wet electric dust collector can move left and right in the first hole, the second hole and the third hole of the carrier beam along the length direction of the carrier beam, so that the distance between the cathode lines can be accurately adjusted when the cathode lines are installed, and the size error caused by the machining error of the distance between the holes is compensated; and in the cathode line occasion of different equidistant distribution, after the interval between each hole is made and confirmed, the cathode line still can move in each hole when installing in order to adjust the interval between adjacent cathode line, and product adaptability is good.
Example 3
The embodiment provides a flue gas discharge device, which comprises the wet electric dust collector in the embodiment 2.
When the span of the carrier beam is large, the overall strength and rigidity of the cathode line carrier beam can be effectively improved under the condition of not increasing the beam section or even reducing the beam section, and the cathode line carrier beam can stably support a cathode line; and the beam cross-sectional dimension is little, and the beam width can be narrower, and the space that the carrier bar occupied in wet-type electrostatic precipitator reduces, the mass transfer area increase, the circulation resistance of flue gas in wet-type electrostatic precipitator reduces, and dust collection efficiency improves.
In addition, the cathode lines of the wet electric dust collector can move left and right in the first hole, the second hole and the third hole of the carrier beam along the length direction of the carrier beam, so that the distance between the cathode lines can be accurately adjusted when the cathode lines are installed, and the size error caused by the machining error of the distance between the holes is compensated; and in the cathode line occasion of different equidistant distribution, after the interval between each hole is made and confirmed, the cathode line still can move in each hole when installing in order to adjust the interval between adjacent cathode line, and product adaptability is good.
Referring to fig. 3, the flue gas discharging device further comprises a desulfurizing tower and two uniform distribution plates, the wet electric dust collector comprises a dust collector body and a reducing section arranged below the dust collector body, the top of the desulfurizing tower is arranged on the reducing section, and the bearing beam is arranged inside the dust collector body in a crossing manner.
Wherein, two equipartition boards 1 are set up in reducing section 22 from top to bottom at interval. The external diameter of dust remover body 21 is greater than desulfurizing tower 3 external diameter, and reducing section 22 is the round platform of inversion, and its external diameter is done for declining gradually from top to bottom, and reducing section 22 sets up in order to connect desulfurizing tower 3 and dust remover body 21 at desulfurizing tower 3 top.
Referring to fig. 4, each of the plates includes a first region 11 and a second region 12. The first area 11 is circular, the diameter of the first area 11 is the same as the inner diameter of the desulfurizing tower 3, and a plurality of fourth holes 111 with the same shape and size are uniformly formed in the first area 11; for example, the fourth hole 111 is a circular hole.
The second area 12 is circular and is arranged around the first area 11; the second region 12 is provided with three circles of fifth holes 121, the fifth holes 121 are also circular holes, the area of a single fifth hole 121 is larger than that of a single fourth hole 111, the areas of the fifth holes 121 located on the same circle are the same, the area of the single fifth hole 121 is gradually increased from inside to outside, and the fifth holes 121 located on any circle are evenly distributed on the same circle to evenly guide the airflow to enter the second region 12. The fourth hole 111 and the fifth hole 121 are both round holes, so that holes can be conveniently formed.
In the second region 12, the area of the fifth holes 121 increases gradually from the inside to the outside in the radial direction, and the fifth holes 121 are distributed radially in the second region 12. The area of fifth hole 121 increases gradually and is radial from inside to outside, and the air current guide effect is good, can make the air current at the regional 12 more evenly distributed of second, makes the air current more evenly get into dust remover body 21 on upper portion, further promotes dust removal effect.
The uniform distribution plate 1 of the structure is arranged on the diameter-changing section 22 at the inlet of the wet electric precipitator, the diameter-changing section 22 is arranged at the top of the desulfurizing tower 3, when the wet electric precipitator works, flue gas enters the diameter-changing section 22 from the desulfurizing tower 3 below, the diameter of the first area 11 is the same as the inner diameter of the desulfurizing tower 3, and the fourth holes 111 are the same in shape and size and are uniformly distributed, so that the air flow can be uniformly distributed in the first area 11; the second area 12 is located outside the inner diameter projection of the desulfurizing tower 3, the plurality of fifth holes 121 are arranged outside the first area 11 in a surrounding mode, the area of each fifth hole 121 is larger than that of each fourth hole 111, the holes of the second area 12 are larger than those of the first area 11, airflow resistance is reduced from the first area 11 to the second area 12, partial airflow in the middle is guided to pass through the distribution plate 1 through the second area 12, partial airflow passes through the distribution plate 1 through the first area 11, smoke is uniformly distributed in the first area 11 and the second area 12, the airflow uniformly enters the dust remover body 21 on the upper portion, the flow field distribution in the dust remover is uniform, the charge of dust in the electric field is uniform, and the dust removing efficiency is high.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (10)
1. A cathode carrier beam is characterized by comprising
The beam body comprises a top plate (101), a bottom plate (103) and supporting structures (102) arranged on two sides of the top plate (101) and the bottom plate (103), wherein a plurality of first holes (1011) are formed in the top plate (101) and the bottom plate (103) and used for hanging and connecting cathode lines in a penetrating manner; the cross section of the first hole (1011) is in a long strip shape.
2. The cathode carrier beam according to claim 1, characterized in that the first hole (1011) is a kidney-shaped hole.
3. The cathode carrier bar according to claim 1, further comprising a support plate (104), wherein the support plate (104) is disposed between the two support structures (102), a second hole (1041) for a cathode line to pass through is formed in the support plate (104), and the cross section of the second hole (1041) is elongated.
4. The cathode carrier beam according to claim 3, characterized in that the second hole (1041) is a kidney-shaped hole.
5. The cathode carrier beam according to claim 3, characterized in that the top plate (101) and the bottom plate (103) are both flat and parallel to each other.
6. Cathode carrier beam according to claim 5, characterized in that the support plate (104) is parallel to the top plate (101).
7. The cathode carrier beam according to claim 6, characterized in that the height of the beam body is H, the distance between the support plate (104) and the top plate (101) is d,1/5H ≦ d ≦ 1/4H.
8. Cathode carrier beam according to any of claims 1-7, characterized in that the beam body is rectangular in cross-section.
9. The cathode carrier beam according to any of claims 1-7, characterized in that a reinforcement plate (105) is provided on the top plate (101), a third hole (1051) is opened on the reinforcement plate (105) at a position corresponding to the first hole (1011), and the third hole (1051) has the same shape as the first hole (1011); the head of the cathode line is adapted to be fixed to the top plate (101).
10. A wet electric dust collector, which comprises the cathode carrier beam and the cathode wire of any one of claims 1 to 9, wherein the cathode carrier beam is fixed on the inner wall of the wet electric dust collector; the cathode line is hung on the cathode bearing beam.
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