CN103594976B - Combination stringing instrument for line conductor stringing - Google Patents

Abstract

The invention discloses a combined wire tightening tool for line wire tightening, which comprises a fixed pulley, a first wire tightening tackle, a second wire tightening tackle, a winch, a traction rope, a pulley fixing plate and a ball end clamp; The fixed pulley is fixed on the top of the tower; the block fixing plate is fixed on the cross arm of the tower; the second tightening block is fixed on the block fixing plate; the first tightening block is fixed on the bottom of the tower; the winch is fixed on the ground; The traction rope is wound on the winch, and the traction rope drawn from the winch goes around the first tightening block, the fixed pulley and the second tightening block in turn, and then is fastened to the ball clamp; when tightening, only It is necessary to turn the winch and pull the traction rope to realize the tightness of the line conductor. The combined wire tightening tool of the present invention has the advantages of improving the safety and reliability of the wire tightening work of the transmission line, improving the work efficiency of the wire tightening, reducing the labor intensity on the tower, reducing the number of workers, and less difficult to construct.

Description

Combined wire tightening tool for line wire tightening

technical field

The invention relates to a combined wire tightening tool for line wire tightening, in particular to a combined wire tightening tool for overhead line wire tightening in a power system.

Background technique

At present, the main method of tightening the wires of transmission lines is to fix the traction rope on the tension clamp. After the wire is tightened, due to gravity, the porcelain bottle is strung under the line, and it needs manpower to twist the porcelain bottle up to the level of the wire and then install it on the cross arm of the pole tower. Guarantee, low line efficiency and high construction cost.

At present, when the wires of the transmission line are tightened, the pulley is usually fixed on the pole tower or concrete pole with No. 8 iron wire or thin steel wire rope. Often, the pulley will jump and fall to the ground under the tension of the tight wire. , causing great safety hazards to tight-line personnel and ground personnel.

When the single-string insulator string wires of the transmission line are tightened, a steel wire rope is generally used to tie the wire rope under the second porcelain bottle near the cross arm (the contact between the steel wire rope and the insulator is padded with a sack), and the traction rope is fixed on the tension clamp, and the wire is tightened. Finally, due to the effect of gravity, the porcelain bottle string will fall under the line. It is necessary to twist the porcelain bottle up to the level of the wire and install it on the cross arm of the pole tower. protection.

When the double-string insulator string conductors of the transmission line are tightened, a steel wire rope is generally used to tie the insulators and conductors on two pulleys to lift the insulators and conductors. Screw it up to the level of the wire and install it on the cross-arm of the pole tower. The double porcelain bottle string is unbalanced left and right. It is very difficult to hang the porcelain bottle on the cross-arm hanging point by pulling the wire tightly. This method not only makes the pole tightening time-consuming and laborious, but also Safety is not well guaranteed.

Contents of the invention

The present invention is to avoid the shortcomings in the above-mentioned prior art, and provides a combined wire tightening tool for line wire tightening to solve the problems of poor safety, low work efficiency, and difficult construction of transmission line wire wires .

The present invention adopts the following technical solutions to solve the technical problems.

The combined wire tightening tool used for wire tightening of line wires is characterized in that it includes a fixed pulley, a first wire tightening block, a second wire tightening block, a winch, a traction rope, and a block fixing block for fixing the second wire tightening block plate and a ball clamp for clamping a single string of porcelain bottles; the fixed pulley is fixed on the top of the utility pole; the tackle fixing plate is fixed on the cross arm of the utility pole, and the second tightening tackle is fixed on above the block fixed plate; the first tightening block is fixed on the bottom end of the utility pole; the winch is fixed on the ground; the traction rope is wound on the winch, and the The traction rope bypasses the first line tightening block, the fixed pulley and the second line tensioning block in turn, and then is fastened to the ball clamp; when tightening the line, just turn the winch and pull the traction rope to complete the line. Tight wires for wires.

The structural features of the combined wire tightening tool for line wire tightening of the present invention also lie in:

The pulley fixing plate includes a plate-shaped body, a pulley fixing structure for connecting with the second wire tightening block, and a backing plate for fixing the plate-shaped body to the cross arm of the utility pole; The plate-shaped body is provided with a U-shaped through groove that penetrates the plate-shaped body along the thickness direction of the plate-shaped body; The thickness direction of the plate-shaped body penetrates the first through hole of the plate-shaped body; the backing plate is also provided with two second through-holes; the two second through-holes are connected with the two The positions of the first through holes are corresponding; the backing plate is fixed on the plate-shaped body by two bolts; the pulley fixing structure is arranged on the top of the plate-like body, and the pulley fixing structure includes two Two vertical plates are arranged parallel to each other, and each vertical plate in the two vertical plates is provided with a third through hole; a bolt passes through the third through hole of the two vertical plates in turn and is fixed on the within the two third through holes.

The plate-shaped body is an arc-shaped plate, and the trolley fixing structure is located at the top of the arc of the plate-shaped body.

The ball clamp includes an L-shaped plate, a square plate, three screws with pull rings and a top plate, the L-shaped plate includes a first straight plate and is fixedly connected to the first straight plate the second straight plate; the end of the first straight plate far away from the second straight plate is provided with a rectangular opening slot penetrating the first straight plate along the thickness direction of the first straight plate; the first straight plate On the straight plate, a first screw hole is opened on both sides of the rectangular opening groove; two fourth through holes are opened on the square plate;

The top plate is fixedly arranged on the plate surface of the second straight plate away from the first straight plate, and the top plate is provided with a second screw penetrating through the top plate along the thickness direction of the top plate. hole; the second straight plate is provided with a third screw hole penetrating the second straight plate along the thickness direction of the second straight plate; the axis of the second screw hole and the axis of the third screw hole in a straight line.

The top plate is an inverted U-shaped plate, and the support plates on both sides of the top plate are fixed on the surface of the second straight plate.

The combined wire tightening tool for line wire tightening also includes a board wire tightener; the board wire tightener includes a V-shaped body, and the V-shaped body includes two legs, and the two legs Each leg in the legs is provided with a hook; the legs include a first leg and a second leg, a fixing plate is arranged on the first leg, and a fixing plate is arranged on the fixing plate The fifth through hole penetrating through the fixing plate along the thickness direction of the fixing plate.

The intersection of the two legs of the V-shaped body is arc-shaped.

Compared with the prior art, the beneficial effects of the present invention are reflected in:

The combined wire tightening tool used for line wire tightening of the present invention uses a pulley fixing plate to fix the wire tightening block in the air, so that the pulley can be fixed on the cross arm of the utility pole through the pulley fixing plate to avoid the occurrence of the wire tightening block from The phenomenon of falling in the air. The single-string porcelain vase and the double-string porcelain vase are respectively connected by the ball head clamp and the joint plate tensioner, and the traction rope is pulled by the winch to tighten the line. The overall structure is simple, convenient and practical, which improves the efficiency of line tightening and fully guarantees construction safety. , reduce construction costs, have the advantages of reducing labor intensity on the tower and reducing the number of workers. The static 15-minute test of 4 tons of tension proves that the combined wire tightening tool used for line wire tightening of the present invention is safe and reliable.

Compared with the traditional way of hanging the pulley under the hanging point rope and the long-distance tightening method, the combined tightening tool for line wire tightening of the present invention has the following advantages:

1) It is not affected by terrain and landform, the tight line occupies a small area, and the civil coordination and young crop compensation costs are small, reducing the impact of human obstruction on construction;

2) Reduce the labor intensity of workers on the tower, and the workload on the original tower is changed to the ground, which alleviates the risk of workers on the tower;

3) Reduce the number of staff on the tower, which was originally operated by 2 to 3 people, and now one person can complete all the work;

4) The tight-line command personnel, the staff on the tower, and the ground operators are all in the same sight area, which is conducive to safety protection;

5) No traction in the process of tightening the line, reducing the unbalanced force on the cross-arm of the tower due to over-traction;

6) When the line is tightened, the porcelain bottle string will not fall, and the force will be parallel, so it is easy to connect the hanging point of the cross arm.

The combined wire tightening tool for line wire tightening of the present invention can improve the safety and reliability of wire tightening work of transmission lines, improve the work efficiency of wire tightening, reduce the labor intensity on poles and towers, reduce the number of workers, and reduce construction difficulty, etc. advantage.

Description of drawings

Fig. 1 is a schematic diagram of the construction state of the combined wire tightening tool for line wire tightening of the present invention.

FIG. 2 is a partially enlarged view of FIG. 1 .

Fig. 3 is a front view of the pulley fixing plate of the combined wire tightening tool used for line wire tightening according to the present invention.

Fig. 4 is a top view of the pulley fixing plate of the combined wire tightening tool used for line wire tightening according to the present invention.

Fig. 5 is a front view of the backing plate of the pulley fixing plate of the combined wire tightening tool used for line wire tightening according to the present invention.

Fig. 6 is a front view of the ball clamp of the combined wire tightening tool used for wire tightening of circuit wires according to the present invention.

Fig. 7 is a left side view of the ball clamp of the combined wire tightening tool used for wire tightening of circuit wires according to the present invention.

Fig. 8 is a front view of the square plate of the ball-tip wire gripper of the combined wire tightening tool for wire tightening of the present invention.

Fig. 9 is a front view of the connecting board wire tensioner of the combined wire tightening tool used for line wire tightening according to the present invention.

Fig. 10 is a left view of the connecting board wire tensioner of the combined wire tightening tool used for line wire tightening according to the present invention.

Labels in attached drawings 1 to 10: 1 fixed pulley, 2 first tightening block, 3 second tightening block, 4 twisting mill, 5 traction rope, 6 block fixing plate, 601 plate-like body, 6011 U-shaped through groove , 6012 first through hole, 602 pulley fixing structure, 6021 vertical plate, 60211 third through hole, 603 backing plate, 6031 second through hole, 7 ball end clamp, 701 L-shaped plate, 7011 first straight plate, 70111 Rectangular open slot, 70112 first screw hole, 7012 second straight plate, 702 square plate, 7021 fourth through hole, 703 top plate, 7031 support plate, 8-plate wire tensioner, 801 V-shaped body, 8011 first leg, 8012 The second leg, 802 hook, 803 fixed plate, 8031 fifth through hole, 9 utility poles, 10 cross arm, 11 single string porcelain bottle, 1101 hanging ring, 1102 connecting column, 12 double string porcelain bottle, 1201 connecting plate, 13 wire , 14 bolts, 15 screws, 1501 pull ring.

The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings.

detailed description

Referring to Figures 1 to 10, the combined wire tightening tool used for line wire tightening includes a fixed pulley 1, a first wire tightening block 2, a second wire tightening block 3, a winch 4, a traction rope 5, and is used for fixing The tackle fixing plate 6 of the second tightening tackle 3 and the ball head clamp 7 for clamping the single string porcelain bottle 11; the fixed pulley 1 is fixed on the top of the utility pole 9; the tackle fixing plate 6 is fixed on the electric wire On the cross arm 10 of the bar 9, the second tightening tackle 3 is fixed on the tackle fixing plate 6; the first tightening tackle 2 is fixed on the bottom end of the utility pole 9; the winch 4 is fixed on the ground; the traction rope 5 is wound on the winch 4, and the traction rope 5 drawn from the winch 4 is passed around the first tight-line tackle 2, the fixed pulley 1 and the second tight-line tackle 3 in turn, and then Tighten on the ball head clamp 7; when tightening the wire, only need to rotate the winch 4 to pull the traction rope 5 to realize the tightening of the line conductor 13.

When it is necessary to tighten the wire 13 of the transmission line, a fixed pulley is installed on the top of the utility pole 9 (pole tower or concrete pole), the bottom end of the utility pole is fixed at the position close to the ground, and the first tightening pulley is fixed, and a motorized winch is set on the ground. grind. The tackle fixing plate is fixed on the cross arm 10 of the utility pole, and the second tensioning tackle is fixed on the tackle fixing plate. The ball joint clamp is clamped on the single-string porcelain bottle 11, or the connecting plate wire tightener is installed on the connecting plate 1201 between the two strings of porcelain bottles of the double-string porcelain bottle 12. The traction rope drawn from the winch bypasses the first wire tightening block, the fixed pulley and the second wire tightening block in turn, and then is fastened to the ball head clamp or the joint plate tensioner, and then the motorized winch is started to pass through the winch. Tighten the traction rope, thereby carrying out tight line to transmission line conductor 13.

One end of the traction rope is fixed on the ball joint clamp, and the other end of the traction rope is fixed on the motor winch to tighten the line after passing through the tensioning pulley and the fixed pulley above the pole tower. After the tightening operation is completed, these devices are removed and can be used again. In this line tightening method, the connection between the porcelain bottle and the traction rope is relatively firm, and the line tightening block is fixed on the cross arm without falling, so it can improve the line tightening efficiency and fully guarantee the construction safety of the staff. The phenomenon that the falling objects hurt the staff occurs, and the construction cost is reduced.

The tackle fixing plate 6 includes a plate-shaped body 601, a tackle fixing structure 602 for connecting with the second wire tightening tackle 3, and a cross arm for fixing the plate-like body 601 to the utility pole 9 10 on the back plate 603; the plate-shaped body 601 is provided with a U-shaped through groove 6011 penetrating the plate-shaped body 601 along the thickness direction of the plate-shaped body 601; on the plate-shaped body 601, Both sides of the U-shaped through groove 6011 have a first through hole 6012 penetrating through the plate-shaped body 601 along the thickness direction of the plate-shaped body 601; the backing plate 603 is also provided with two The second through hole 6031; the two second through holes 6031 correspond to the positions of the two first through holes 6012; the backing plate 603 is fixed to the plate body 601 by two bolts 14 Above; the tackle fixing structure 602 is arranged on the top of the plate body 601, the tackle fixing structure 602 includes two vertical boards 6021, the two vertical boards 6021 are arranged parallel to each other, each of the two vertical boards 6021 A third through hole 60211 is provided on the vertical plate 6021; a bolt 14 passes through the third through holes 60211 of the two vertical plates 6021 in turn and is fixed in the two third through holes 60211.

The tackle fixing plate is composed of three parts: a plate body, a tackle fixing structure and a backing plate. A U-shaped through-slot is arranged on the plate-like body, and two first through-holes are set at the opening of the U-shaped through-slot, and two second through-holes are correspondingly set on the backing plate, two first through-holes and two second through-holes. The two through holes are basically the same in size, and the distance between the two first through holes is equal to the distance between the two second through holes, so that when the backing plate is attached to the plate-shaped body, the first through hole and the second through hole The axes of the two through holes can be on a straight line, so that a bolt can be inserted into the two through holes so as to fix the backing plate and the plate-like body together. The leaning plate is located at the left end of the plate-shaped body. The tackle fixing structure is arranged in the middle of the plate-shaped body and is located at the top of the plate-shaped body. The two vertical plates are respectively located on both sides of the plate-shaped body and arranged relatively parallel. Each of the two vertical plates is provided with a third through hole, and the two third through holes are coaxial. A bolt passes through the third through holes of the two vertical plates in turn, and the bolt can be tightened after the nut is tightened. The second tightening tackle is fixed by bolts to prevent the second tightening tackle from falling on the ground and injuring the staff, or falling on the ground to affect the working efficiency of the tightening.

During the specific operation, the bolts in the first screw holes are first unloaded, the backing plate is removed, and then the side of the U-shaped through groove opening of the plate-shaped body is close to the cross arm of the utility pole, and the cross arm is clamped. Between the backing plate and the plate-like body, insert two bolts into the two first screw holes and the two second screw holes respectively, tighten the nuts, and tightly fix the backing plate, the cross arm and the plate-like body on the Together, the tackle fixing plate is firmly locked on the cross arm of the utility pole. Then, the second wire tightening block is fixed on the block fixing structure, thereby firmly fixing the second wire tightening block on the cross arm, preventing the second wire tightening block from falling during the wire tightening work process and accidentally injuring the staff , Improve the safety and reliability of on-site work, and fully guarantee the construction safety.

A long rod is fixed on the shaft of the second wire tightening block, and the lower end of the long rod is provided with a ring, and the ring is sleeved on the bolts passing through the two third through holes, and the ring is clamped on the two vertical holes. between the boards.

The plate-shaped body 601 is an arc-shaped plate, and the trolley fixing structure 602 is located at the top of the arc of the plate-shaped body 601 . The arc-shaped plate-shaped body can make the tackle fixing plate 6 more conveniently fixed on the cross arm.

The ball clamp 7 includes an L-shaped plate 701, a square plate 702, three screws 15 with pull rings 1501 and a top plate 703, and the L-shaped plate 701 includes a first straight plate 7011 and the same A second straight plate 7012 fixedly connected to the first straight plate 7011; one end of the first straight plate 7011 away from the second straight plate 7012 is provided with a The rectangular opening slot 70111 of the first straight plate 7011; on the first straight plate 7011, a first screw hole 70112 is opened on both sides of the rectangular opening slot 70111; two fourth screw holes are opened on the square plate 702. Through hole 7021;

The top board 703 is fixedly arranged on the board surface of the second straight board 7012 away from the first straight board 7011, and the top board 703 is provided with a The second screw hole of the top plate 703; the second straight plate 7012 is provided with a third screw hole penetrating the second straight plate 7012 along the thickness direction of the second straight plate 7012; the axis of the second screw hole and the axis of the third screw hole are on a straight line.

The board surfaces of the first straight board and the second straight board are perpendicular to each other, and they are fixed to each other in a mutually perpendicular manner. The distance between the two first screw holes of the first straight plate is equal to the distance between the two fourth through holes on the square plate, and the diameters of the first screw holes and the fourth through holes are also the same. The square plate can be fixed on the first straight plate by screwing into the fourth through hole and the screw 15 in the first screw hole in turn, and the thread of the screw 15 cooperates with the thread of the first screw hole.

The ball clamp is used to connect single strings of porcelain bottles 11 . A hanging ring 1101 is provided at the end of the single-string porcelain bottle 11 , and the hanging ring and the porcelain bottle are connected through a connecting column 1102 . During the thread tightening operation, the ball joint clamp is arranged on the connecting post 1102, and the connecting post 1102 is located in the rectangular opening groove. Then the square plate is fixed on the first straight plate by the screw 15 with the pull ring, so that the connecting column 1102 of the single string of porcelain bottles is locked in the rectangular opening groove, so that the ball joint clamp can be avoided It falls off from the single-string porcelain bottle, which improves the safety and reliability of the tight line work, and at the same time ensures the personal safety of the on-site staff. Then the traction rope is fastened on the ball clamp, and then the dynamic winch is started, and the traction rope is tightened through the winch, so as to tighten the wires of the transmission line.

Screws 15 with pull rings are screwed into the second screw hole and the third screw hole in turn, and the screws are fixed on the top board and the second straight board.

The top plate 703 is an inverted U-shaped plate, and the supporting plates 7031 on both sides of the top plate 703 are fixed on the surface of the second straight plate 7012 .

The combined wire tightening tool for line wire tightening also includes a board wire tightener 8; the board wire tightener 8 includes a V-shaped body 801, and the V-shaped body 801 includes two legs. Each of the two legs is provided with a hook 802; the legs include a first leg 8011 and a second leg 8012, and a fixing plate 803 is provided on the first leg 8011, The fixing plate 803 is provided with a fifth through hole 8031 penetrating through the fixing plate 803 along the thickness direction of the fixing plate 803 .

The two supporting legs of the connecting plate tensioner are made of a steel bar, the steel bar is bent in a V shape, and the bending part is arc-shaped. There is a hook on each leg. During the wire tightening operation, the connecting board wire tightening device is used to connect the double-string porcelain bottles. A connecting plate 1201 is arranged between the two strings of porcelain bottles 12 of the double-stringing porcelain bottles. The connecting plate 1201 is provided with a plurality of through holes. Hang the two hooks of the connecting plate tightener on the connecting plate 1201 of the double-string porcelain bottle 12, then pass through the fifth through hole on the fixing plate and the through hole on the connecting plate 1201 successively through a bolt 14, and The fixing plate 803 and the connecting plate 1201 are fixed together, thereby preventing the connecting plate wire tightening device from falling off from the double-string porcelain bottle, improving the safety and reliability of the wire tightening work, and at the same time ensuring the personal safety of the on-site staff. The efficiency of line tightening is improved, construction safety is fully guaranteed, and construction cost is reduced.

When the line needs to be tightened, fasten the traction rope to the intersecting part of the two legs of the V-shaped body of the connecting plate tensioner, and then start the dynamic winch, and tighten the traction rope through the winch, so as to align the transmission line conductors. Make a tight line.

The intersection of the two legs of the V-shaped body 801 is arc-shaped.

Claims (5)

1. The combined wire tightening tool used for line wire tightening is characterized in that it includes a fixed pulley (1), a first wire tightening block (2), a second wire tightening block (3), a winch mill (4), a traction Rope (5), the tackle fixing plate (6) that is used to fix the second tightening tackle (3) and the ball end clamping device (7) that is used to clamp single string porcelain bottle (11); The fixed pulley (1 ) is fixed on the top of the utility pole (9); the tackle fixing plate (6) is fixed on the crossarm (10) of the utility pole (9), and the second tightening tackle (3) is fixed on the tackle above the board (6); the first wire tightening block (2) is fixed on the bottom end of the utility pole (9); the winch (4) is fixed on the ground; the traction rope (5) is wound around the On the winch mill (4), the drawn traction rope (5) on the winch mill (4) walks around the first tight wire block (2), the fixed pulley (1) and the second tight wire block (3) successively, and then Tighten it on the ball head clamp (7); when tightening the wire, you only need to turn the winch (4) to pull the traction rope (5) to realize the tightening of the line wire (13); The ball end clamp (7) includes an L-shaped plate (701), a square plate (702), three screws (15) with pull rings (1501) and a top plate (703), the L The shaped plate (701) includes a first straight plate (7011) and a second straight plate (7012) fixedly connected with the first straight plate (7011); One end of the straight plate (7012) is provided with a rectangular opening slot (70111) penetrating through the first straight plate (7011) along the thickness direction of the first straight plate (7011); the first straight plate (7011) On the top, a first screw hole (70112) is opened on both sides of the rectangular opening slot (70111); two fourth through holes (7021) are opened on the square plate (702); The top board (703) is fixedly arranged on the board surface of the second straight board (7012) away from the side of the first straight board (7011), and the top board (703) is provided with (703) penetrates the second screw hole of the top plate (703) in the thickness direction; the second straight plate (7012) is provided with a second screw hole penetrating the second straight plate (7012) in the thickness direction. The third screw hole of the straight plate (7012); the axis of the second screw hole and the axis of the third screw hole are on a straight line; The combined wire tightening tool for line wire tightening also includes a connecting board wire tightening device (8); the connecting board wire tightening device (8) includes a V-shaped body (801), and the V-shaped body (801) includes two a leg, each leg in the two legs is provided with a hook (802); the legs include a first leg (8011) and a second leg (8012), the first leg A fixing plate (803) is arranged on the support leg (8011), and a fifth penetrating plate (803) penetrating the fixing plate (803) along the thickness direction of the fixing plate (803) is arranged on the fixing plate (803). Through hole (8031). 2. The combined wire tightening tool for line wire tightening according to claim 1, characterized in that, the pulley fixing plate (6) includes a plate-shaped body (601) for connecting with the second wire tightening A tackle fixing structure (602) connected to the tackle (3), a backing plate (603) for fixing the plate-like body (601) to the crossarm (10) of the utility pole (9); The plate-shaped body (601) is provided with a U-shaped through groove (6011) penetrating the plate-shaped body (601) along the thickness direction of the plate-shaped body (601); There is a first through hole (6012) penetrating through the plate-shaped body (601) along the thickness direction of the plate-shaped body (601) on both sides of the U-shaped through groove (6011); Two second through holes (6031) are also arranged on the leaning plate (603); the positions of the two second through holes (6031) correspond to the positions of the two first through holes (6012); the leaning The plate (603) is fixed on the plate-shaped body (601) by two bolts (14); the pulley fixing structure (602) is arranged on the top of the plate-like body (601), and the pulley fixing structure ( 602) includes two vertical plates (6021), the two vertical plates (6021) are arranged parallel to each other, and each vertical plate (6021) in the two vertical plates (6021) is provided with a third through hole (60211); A bolt (14) sequentially passes through the third through holes (60211) of the two vertical plates (6021) and is fixed in the two third through holes (60211). 3. The combined wire tightening tool for line wire tightening according to claim 2, characterized in that, the plate-shaped body (601) is an arc-shaped plate, and the pulley fixing structure (602) is located on the plate At the arc top of the shape body (601). 4. The combined wire tightening tool for line wire tightening according to claim 1, characterized in that, the top plate (703) is an inverted U-shaped plate, and the support plates (7031) on both sides of the top plate (703) are fixed on the board surface of the second straight board (7012). 5. The combined wire tightening tool for line wire tightening according to claim 1, characterized in that, the intersection of the two legs of the V-shaped body (801) is arc-shaped.