CN112570479B

CN112570479B - Straightening device used before surface treatment of tire bead steel wire

Info

Publication number: CN112570479B
Application number: CN202011254669.5A
Authority: CN
Inventors: 王金武; 窦万明; 马春翔; 窦衍君; 王松; 姜瑶瑶; 孙璐
Original assignee: Shandong Daye Co Ltd
Current assignee: Shandong Daye Co Ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2023-02-10
Anticipated expiration: 2040-11-11
Also published as: CN112570479A

Abstract

The utility model provides a straightener before tire bead steel wire surface treatment, the on-line screen storage device comprises a base, the bottom side of the riser of two front and back distributions of top side fixed connection of base, be equipped with a several opening pipe between the riser, adjacent side is rotated through the connecting rail around the opening pipe and is connected, the rear side of the opening pipe of rearmost side and the riser fixed connection of rear side, the front end of the opening pipe of foremost side rotates with the rear side of the riser of front side to be connected, the intraductal backup pad that is equipped with two bilateral symmetry of opening, the one end of one side fixed connection several telescopic link that the backup pad carried on the back mutually, the other end and the opening pipe fixed connection of telescopic link. The steel wire drawing device is simple in structure and ingenious in conception, and can flexibly adjust the force application angle of the pressing wheels, so that the angle of the pressing wheels can be adjusted according to the drawing requirements of different steel wires, the opening directions of the adjacent pressing wheels can face one side, the steel wires can conveniently penetrate between the pressing wheels, the market requirements can be met, and the steel wire drawing device is suitable for popularization.

Description

Straightening device used before surface treatment of tire bead steel wire

Technical Field

The invention belongs to the field of steel wire drawing devices, and particularly relates to a straightening device for a tire bead steel wire before surface treatment.

Background

The prior straightening device has a simple structure, three staggered straightening shafts are directly arranged on a support for wire drawing, pressing wheels are sleeved on the straightening shafts, and raw steel wires penetrate through the pressing wheels for straightening; however, in the device, the contact point of the steel wire raw material and the pressing wheel is stressed in a single direction, the stress is uneven, the alignment is rough, the precision is not high, the abrasion to the wire drawing die is large during the wire drawing treatment, and the service life of the wire drawing die is shortened; CN 204866870U, granted and announced by chinese patent office 2015.12.16, "a straightening device for wire drawing", straightens the steel wire by two sets of mutually perpendicular press wheels, so that the surface of the steel wire is uniformly stressed, and the straightening effect is improved, but the operation of the end of the steel wire passing through the lead between the press wheels is complex, so that the steel wire is not conveniently put between the press wheels, and meanwhile, the force application direction of the press wheels is single, and only four mutually perpendicular directions (up, down, front and back) still cannot make the steel wire uniformly stressed, and multiple wire drawing is needed, which cannot meet the actual requirements, so we invented a straightening device before surface treatment of the tire bead steel wire.

Disclosure of Invention

The invention provides a straightening device before surface treatment of a tire bead steel wire, which is used for overcoming the defects in the prior art.

The invention is realized by the following technical scheme:

a straightening device before surface treatment of a tire bead steel wire comprises a base, wherein the top side of the base is fixedly connected with the bottom sides of two vertical plates which are distributed in the front and back direction, a row of a plurality of open tubes are arranged between the vertical plates, the front side and the back side of each open tube are rotatably connected through a connecting rail, the back side of each open tube at the last side is fixedly connected with the vertical plate at the back side, the front end of the open tube at the foremost side is rotatably connected with the back side of the vertical plate at the front side, two bilaterally symmetrical supporting plates are arranged in each open tube, one side of each supporting plate opposite to the other is fixedly connected with one end of a plurality of telescopic rods, the other end of each telescopic rod is fixedly connected with the open tubes, the top sides of the supporting plates are respectively rotatably provided with press wheels through bearings, the press wheels at the left side and the right side are staggered in the front and back direction, strip-shaped racks are respectively fixedly arranged at the bottom sides of the supporting plates, gears are engaged and matched with gears at the bottom sides of the strip-shaped racks, the first worm gears are respectively rotatably connected with the corresponding open tubes through supports, through-holes are formed in the bottoms of the open tubes, and are rotatably provided with first worm gears through bearings; the periphery of the opening pipe except the opening pipe on the last front side is fixedly connected with the inner periphery of the opening annular bevel gear respectively, the left side and the right side of the opening annular bevel gear are provided with the bevel gears in a meshing fit mode respectively, the inner end of a middle fixed connection rotating shaft on the outer side of the bevel gears is fixedly connected with the inner end of a rotating shaft, the rotating shaft is rotatably installed on a vertical plate, a second worm wheel coaxial with the middle part of the outer periphery of the rotating shaft is fixedly installed in the middle of the outer periphery of the rotating shaft, a second worm is arranged on the bottom side of the second worm wheel in a meshing fit mode, the front end and the rear end of the second worm are adjacent in fixed connection, the end part of the second worm close to the vertical plate is rotatably connected with the vertical plate through a bearing, the transmission ratio of the second worm and the second worm wheel is gradually decreased from back to front, and the middle of the vertical plate is provided with a through groove respectively.

According to the straightening device before surface treatment of the tire bead steel wire, the short shaft is arranged above the base, the rear end of the short shaft is rotatably connected with the middle of the front side equipment of the vertical plate at the rear side through the bearing, the rear end of the outer periphery of the second worm at the last side is fixedly connected with the inner periphery of the first chain wheel respectively, the rear end of the outer periphery of the short shaft is fixedly provided with the second chain wheel, the second chain wheel is in transmission connection with the first chain wheel through the same chain, and the front end of the short shaft is fixedly provided with the hand wheel.

According to the straightening device before surface treatment of the tire bead steel wire, the top side of the supporting plate on one side is rotatably provided with the pressing wheel through the bearing, the top side of the supporting plate on the other side is rotatably provided with the two pressing wheels through the bearing, and the supporting plate provided with the pressing wheel and the supporting plate provided with the two pressing wheels are alternately distributed in the front and back direction on the top side of the supporting plate on the same front and back side.

According to the straightening device before surface treatment of the tire bead steel wire, the connecting rail comprises the arc-shaped sliding grooves, the lower parts of the front sides of the opening pipes except the opening pipe on the foremost side are respectively provided with the arc-shaped sliding grooves, the axes of the arc-shaped sliding grooves and the axis center line of the opening pipe are collinear, the arc-shaped plate is arranged in one end of each arc-shaped sliding groove in a sliding mode, and the front end of each arc-shaped plate is fixedly connected with the rear side of the opening pipe adjacent to the front side.

According to the straightening device before surface treatment of the tire bead steel wire, the arc-shaped sliding groove is a five-twelfth-circle arc-shaped groove, and the arc-shaped plate is a one-twelfth-circle sector plate.

The invention has the advantages that: the steel wire drawing device is simple in structure and ingenious in conception, and can flexibly adjust the force application angle of the pressing wheels, so that the angle of the pressing wheels can be adjusted according to the drawing requirements of different steel wires, the opening directions of the adjacent pressing wheels can face one side, the steel wires can conveniently penetrate through the pressing wheels, the market requirements can be met, and the steel wire drawing device is suitable for popularization. When the steel wire straightening device is used, one end of a steel wire sequentially penetrates through a through groove on one side and between pressing wheels on the left side and the right side, and penetrates through a through groove on the other side, the steel wire between two vertical plates is in a straightening state, then handle wheels at the lower end of a first worm are respectively rotated to enable the first worm to rotate, the first worm drives a corresponding first worm wheel to reversely and synchronously rotate, the first worm wheel drives a gear to rotate, the gear drives a strip-shaped rack and a supporting plate to move oppositely, the pressing wheels are close to each other, so that the pressing wheels form pressing force on the steel wire, and the pressing force of the pressing wheels on the left side and the right side is kept fixed by utilizing self-locking between the first worm and the first worm wheel; then synchronously rotating a second worm to enable the second worm to drive a corresponding second worm wheel, a corresponding rotating shaft and corresponding bevel gears to rotate, wherein the rotating directions of the bevel gears on the left side and the right side are opposite, so that the bevel gears drive the opening annular bevel gears to rotate, and at least one bevel gear is meshed with the opening annular bevel gear; the transmission ratio of the second worm and the second worm wheel is decreased from back to front, namely the second worm rotates for a circle, the second open pipe on the rear side rotates clockwise for one degree, the third open pipe on the rear side rotates clockwise for two degrees, and the fourth open pipe on the rear side rotates clockwise for three degrees; the second worm rotates for two circles, the second open pipe on the rear side rotates clockwise for two degrees, the third open pipe on the rear side rotates clockwise for four degrees, and the fourth open pipe on the rear side rotates clockwise for six degrees; the second worm rotates for three circles, the second open pipe on the rear side rotates for three degrees clockwise, the third open pipe on the rear side rotates for six degrees clockwise, and the fourth open pipe on the rear side rotates for nine degrees clockwise; the second worm rotates all around, the clockwise rotation four degrees of the second open pipe of rear side, the clockwise rotation eight degrees of the third open pipe of rear side, the clockwise rotation twelve degrees of the fourth open pipe of rear side, analogize in proper order, rotate ninety week to the second worm, the clockwise rotation ninety two degrees of the second open pipe of rear side, the clockwise rotation one hundred eighty degrees of the third open pipe of rear side, the clockwise rotation two hundred seven degrees of the fourth open pipe of rear side, the open pipe can't continue clockwise rotation this moment, the pressure direction mutually perpendicular of the pinch roller in the adjacent open pipe this moment, and can utilize auto-lock between second worm and the second worm wheel, make the open pipe keep fixed, keep the pinch force direction of pinch roller to the steel wire to remain unchanged.

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 description of 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 those skilled in the art can obtain other drawings based on the drawings without inventive labor.

FIG. 1 is a schematic structural view of the present invention; fig. 2 is a view in the direction a of fig. 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A straightening device before surface treatment of a tire bead steel wire comprises a base 1, wherein the top side of the base 1 is fixedly connected with the bottom sides of two vertical plates 2 which are distributed front and back, a row of a plurality of open tubes 3 are arranged between the vertical plates 2, the open tubes 3 are coaxially distributed front and back, the front ends and the top sides of the open tubes 3 are respectively opened, the front sides and the back sides of the open tubes 3 are in sliding contact fit, the front sides and the back sides of the open tubes 3 are rotatably connected through a connecting rail, the back side of the open tube 3 at the last side is fixedly connected with the vertical plate 2 at the back side, the front end of the open tube 3 at the foremost side is rotatably connected with the back side of the vertical plate 2 at the front side, two bilaterally symmetrical supporting plates 6 are arranged in the open tubes 3, one side of the supporting plate 6 at the back side is fixedly connected with one end of a plurality of telescopic rods 7, the other end of the telescopic rod 7 is fixedly connected with the open pipe 3, the top sides of the supporting plates 6 are respectively provided with press wheels 8 through bearings in a rotating mode, the press wheels 8 on the left side and the right side are distributed in a front-back staggered mode, the bottom sides of the supporting plates 6 are respectively and fixedly provided with strip-shaped racks 9, the bottom sides of the strip-shaped racks 9 are meshed and matched with a gear 10, the front sides of the gears 10 are fixedly provided with coaxial first worm gears 11, the first worm gears 11 are respectively and rotatably connected with the corresponding open pipes 3 through supports, the first worm gears 11 are rotatably arranged at one ends of the supports through the bearings, the other ends of the supports are fixedly connected with the corresponding open pipes 3, the bottoms of the open pipes 3 are provided with through holes 12, first worms 13 are rotatably arranged in the through holes 12 through the bearings, and the first worm gears 11 are respectively meshed and matched with the corresponding first worms 13; the periphery of the opening pipe 3 except the opening pipe 3 at the front side at the end is respectively fixedly connected with the inner periphery of an opening annular bevel gear 14, the opening direction of the opening annular bevel gear 14 is consistent with the opening direction of the opening pipe 3, the opening angle at the top side of the opening annular bevel gear 14 is more than ninety degrees and less than one hundred twenty degrees, the left side and the right side of the opening annular bevel gear 14 are respectively provided with a bevel gear 15 in a meshing and matching way, the middle of the outer side of the bevel gear 15 is fixedly connected with the inner end of a rotating shaft 16, the rotating shaft 16 is rotatably arranged on a vertical plate 2, the outer end of the rotating shaft 16 is rotatably connected with the inner side of a connecting plate 18 through a bearing, the connecting plate 18 is fixedly connected with the vertical plate 2, the two connecting plates 18 are distributed left and right, the front end and the rear end of each connecting plate 18 are respectively fixedly connected with the vertical plate 2, and the middle part of the periphery of the rotating shaft 16 is fixedly provided with a coaxial second worm gear 17, the bottom side of the second worm wheel 17 is provided with a second worm 19 in a meshing fit mode, the front end and the rear end of the second worm 19 are fixedly connected with the adjacent ends, the second worms 19 distributed in the front and the rear directions are coaxial, the end part, close to the vertical plate 2, of the second worm 19 is rotatably connected with the vertical plate 2 through a bearing, the rear end of the second worm 19 on the rearmost side and the front end of the second worm 19 on the foremost side are rotatably connected with the corresponding vertical plate 2 through bearings, the transmission ratio of the second worm 19 to the second worm wheel 17 decreases from the rear to the front, the transmission ratio of the second worm 19 and the second worm wheel 17 on the left side of the same open pipe 3 is the same as that of the second worm 19 and the second worm wheel 17 on the right side, the middle part of the vertical plate 2 is provided with a through groove 20, and the vertical midpoint of the vertical midpoints of the pinch rollers 15 on the left side and the right side are on the axis of the through groove 20. The steel wire drawing device is simple in structure and ingenious in conception, and can flexibly adjust the force application angle of the pressing wheels, so that the angle of the pressing wheels can be adjusted according to the drawing requirements of different steel wires, the opening directions of the adjacent pressing wheels can face one side, the steel wires can conveniently penetrate between the pressing wheels, the market requirements can be met, and the steel wire drawing device is suitable for popularization. When the steel wire pressing device is used, one end of a steel wire sequentially penetrates through the through groove 20 on one side and between the pressing wheels 8 on the left side and the right side, the through groove 20 on the other side penetrates through the steel wire, the steel wire between the two vertical plates 2 is in a straightened state, then handle wheels at the lower ends of the first worms 13 are respectively rotated to enable the first worms 13 to rotate, the first worms 13 drive the corresponding first worm wheels 11 to reversely and synchronously rotate, the first worm wheels 11 drive the gears 10 to rotate, the gears 10 drive the strip-shaped racks 9 and the supporting plates 6 to move oppositely, and the pressing wheels 8 are close to each other, so that the pressing wheels 8 form pressing force on the steel wire, and self-locking between the first worms 13 and the first worm wheels 11 can be utilized to keep the distance between the pressing wheels 8 on the left side and the right side fixed, and the pressing force of the pressing wheels 8 on the steel wire is kept; then synchronously rotating a second worm 19, so that the second worm 19 drives a corresponding second worm wheel 17, a corresponding rotating shaft 16 and corresponding bevel gears 15 to rotate, the rotating directions of the bevel gears 15 on the left side and the right side are opposite, so that the bevel gears 15 drive the opening annular bevel gears 14 to rotate, and at least one bevel gear 15 is in meshing fit with the opening annular bevel gear 14; because the transmission ratio of the second worm 19 and the second worm wheel 17 decreases from back to front, namely the second worm 19 rotates for a circle, the second open pipe 3 at the rear side rotates clockwise for one degree, the third open pipe 3 at the rear side rotates clockwise for two degrees, and the fourth open pipe 3 at the rear side rotates clockwise for three degrees; the second worm 19 rotates for two circles, the second open pipe 3 at the rear side rotates clockwise for two degrees, the third open pipe 3 at the rear side rotates clockwise for four degrees, and the fourth open pipe 3 at the rear side rotates clockwise for six degrees; the second worm 19 rotates three times, the second open pipe 3 at the rear side rotates three degrees clockwise, the third open pipe 3 at the rear side rotates six degrees clockwise, and the fourth open pipe 3 at the rear side rotates nine degrees clockwise; the second worm 19 rotates around, the second rear-side open pipe 3 rotates clockwise by four degrees, the third rear-side open pipe 3 rotates clockwise by eight degrees, the fourth rear-side open pipe 3 rotates clockwise by twelve degrees, and so on, until the second worm 19 rotates ninety weeks, the second rear-side open pipe 3 rotates clockwise by ninety two degrees, the third rear-side open pipe 3 rotates clockwise by one hundred eighty degrees, the fourth rear-side open pipe 3 rotates clockwise by two hundred seven degrees, at this time, the open pipes 3 cannot continue to rotate clockwise, the pressure directions of the pinch rollers 8 in the adjacent open pipes 3 are mutually vertical, and self-locking between the second worm 19 and the second worm wheel 17 can be utilized, so that the open pipes 3 are kept fixed, and the pressing force direction of the pinch rollers 8 on the steel wires is kept unchanged.

Specifically, as shown in the drawing, a short shaft 21 is provided above the base 1 according to the present embodiment, the rear end of the short shaft 21 is rotatably connected to the middle of the front device of the rear vertical plate 2 through a bearing, the rear end of the outer periphery of the second worm 19 on the rearmost side is fixedly connected to the inner periphery of the first sprocket 22, the rear end of the outer periphery of the short shaft 21 is fixedly connected to the second sprocket 23, the second sprocket 23 is drivingly connected to the first sprocket 22 through the same chain 24, the front end of the short shaft 21 is fixedly connected to a hand wheel 25, and the thread directions of the second worms 19 on the left and right sides are opposite. The hand wheel 25 is used for manually rotating the short shaft 21, the short shaft 21 drives the second chain wheel 23 to rotate, the second chain wheel 23 drives the first chain wheel 22 to rotate through the chain 24, and the first chain wheel 22 drives the corresponding second worm 19 to rotate, so that the second worms 19 on the left side and the right side synchronously rotate.

Specifically, as shown in the figure, the top side of the supporting plate 6 on one side of the present embodiment is rotatably provided with one pressing wheel 8 through a bearing, the top side of the supporting plate 6 on the other side is rotatably provided with two pressing wheels 8 through a bearing, and the top side of the supporting plate 6 on the same side in the front and the back is provided with the supporting plate 6 provided with one pressing wheel 8 and the supporting plate 6 provided with two pressing wheels 8 in the front and the back alternate distribution.

Further, as shown in the figure, the connection rail described in this embodiment includes arc spout 4, arc spout 4 is seted up respectively to the lower part of 3 front sides of opening pipe except the opening pipe 3 of foremost front side, the axis of arc spout 4 and the axis central line collineation of opening pipe 3, slidable mounting arc 5 in the one end of arc spout 4, the rear end of arc 5 can slide in the arc spout 4 that corresponds, the arc curved surface of arc 5 and the lateral wall sliding contact cooperation that arc spout 4 corresponds, the front end of arc 5 and the rear side fixed connection of the adjacent opening pipe 3 in front side, arc 5 only can slide in arc spout 4, can't shift out, thereby avoid the separation of adjacent opening pipe 3. When the front and the back adjacent open pipes 3 rotate relatively, the open pipe 3 at the front side drives the arc-shaped plate 5 to slide in the arc-shaped sliding groove 4 on the open pipe 3 at the back side.

Further, as shown in the drawings, the arc chute 4 of the present embodiment is an arc chute of a fifth of a twelfth circle, and the arc plate 5 is a sector plate of a twelfth of a circle. When the arc-shaped plate 5 rotates from one end of the arc-shaped sliding groove 4 to the other end along the arc-shaped sliding groove 4, the front and the rear adjacent open pipes 3 rotate ninety degrees relatively.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A straightening device before surface treatment of a tire bead steel wire is characterized in that: the device comprises a base (1), the top side of the base (1) is fixedly connected with the bottom sides of two vertical plates (2) which are distributed in the front and back, a row of a plurality of open pipes (3) are arranged between the vertical plates (2), the front sides and the back sides of the open pipes (3) are rotatably connected through a connecting rail, the back side of the open pipe (3) at the last side is fixedly connected with the vertical plate (2) at the back side, the front end of the open pipe (3) at the foremost side is rotatably connected with the back side of the vertical plate (2) at the front side, two bilaterally symmetrical support plates (6) are arranged in the open pipe (3), one sides of the support plates (6) at the back are fixedly connected with one ends of a plurality of telescopic rods (7), the other ends of the telescopic rods (7) are fixedly connected with the open pipe (3), the top sides of the support plates (6) are respectively rotatably provided with a press wheel (8) through a bearing, the press wheels (8) are distributed at the front side and the back in a staggered manner, the left side and the right side, the bottom sides of the support plates (6) are respectively fixedly provided with strip-shaped racks (9), the bottom of the support plates (9) are respectively fixedly provided with a gear (10) in a meshing manner, a first worm wheel (11) which is correspondingly provided with a through hole (12) corresponding to a through hole (13) corresponding to a first through which the through hole (12) is correspondingly, and a through hole (13) is provided for the through which the through hole (12) is correspondingly and a through which the through hole (12) is correspondingly arranged; the periphery of the opening pipe (3) except the opening pipe (3) on the rearmost side is fixedly connected with the inner periphery of an opening annular bevel gear (14) respectively, the left side and the right side of the opening annular bevel gear (14) are provided with bevel gears (15) in a meshing and matching mode respectively, the middle of the outer side of each bevel gear (15) is fixedly connected with the inner end of a rotating shaft (16), the rotating shaft (16) is rotatably installed on a vertical plate (2), a coaxial second worm gear (17) is fixedly installed in the middle of the periphery of the rotating shaft (16), a second worm (19) is arranged on the bottom side of the second worm gear (17) in a meshing and matching mode, the front end and the rear end of the second worm (19) are fixedly connected, the end portion, close to the vertical plate (2), of the second worm (19) is rotatably connected with the vertical plate (2) through bearings, the transmission ratio of the second worm (19) and the second worm gear (17) is gradually reduced from back to front, and the middle of the vertical plate (2) is provided with a through groove (20) respectively.

2. A bead wire surface preparation straightener as claimed in claim 1, characterized in that: the upper portion of base (1) be equipped with minor axis (21), the rear end of minor axis (21) is passed through the bearing rotation with the centre of the riser (2) front side equipment of rear side and is connected, the rear end of the second worm (19) periphery of rearmost side is fixed connection first sprocket (22) inner periphery respectively, the rear end fixed mounting second sprocket (23) of minor axis (21) periphery, second sprocket (23) are connected through same chain (24) transmission with first sprocket (22), the front end fixed mounting hand wheel (25) of minor axis (21).

3. A bead wire surface preparation straightener as claimed in claim 1, characterized in that: the top side of the supporting plate (6) on one side is rotatably provided with one pressing wheel (8) through a bearing, the top side of the supporting plate (6) on the other side is rotatably provided with two pressing wheels (8) through a bearing, and the top side of the supporting plate (6) on the same side in the front and the back is provided with the supporting plate (6) with one pressing wheel (8) and the supporting plate (6) with two pressing wheels (8) in the front and the back are alternately distributed.

4. A bead wire surface preparation straightener as claimed in claim 1, characterized in that: the connecting rail comprises an arc-shaped sliding groove (4), the lower part of the front side of the opening pipe (3) except the opening pipe (3) at the most front side is provided with the arc-shaped sliding groove (4) respectively, the axis of the arc-shaped sliding groove (4) is collinear with the axis central line of the opening pipe (3), an arc-shaped plate (5) is arranged in one end of the arc-shaped sliding groove (4) in a sliding mode, and the front end of the arc-shaped plate (5) is fixedly connected with the rear side of the opening pipe (3) adjacent to the front side.

5. A bead wire surface preparation straightener as claimed in claim 4, characterized in that: the arc chute (4) is an arc chute of a fifth of twelve circles, and the arc plate (5) is a fan-shaped plate of a fifth of twelve circles.