CN111842711A

CN111842711A - Motor coil's former

Info

Publication number: CN111842711A
Application number: CN202010833519.3A
Authority: CN
Inventors: 王峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-18
Filing date: 2020-08-18
Publication date: 2020-10-30

Abstract

The invention provides a forming device of a motor coil, and belongs to the technical field of motors. The forming equipment solves the technical problems of low forming efficiency and the like of the existing motor coil forming equipment. This former of electric machine coil's former constructs includes the support body, go up mould and lower mould, the left and right sides of support body up end all is equipped with the stopper, be equipped with on the stopper along transversely running through and rear end open-ended spacing groove with the stopper, the lower mould can lean on and buckle the copper line with the copper line middle part that both ends were arranged in the spacing groove along vertical preceding slip in-process, the both ends of copper line and all break away from the spacing groove that corresponds and hug closely in the left and right sides face with the lower mould this moment, go up mould and lower mould cooperation and can extrude the shape that needs with pasting the copper line on the lower. The limiting block can play a role in fixing the copper wire before forming and also can play a role in demoulding after the copper wire is formed, and the copper wire demoulding device is simple in structure, good in demoulding effect and beneficial to improving the whole forming efficiency.

Description

Motor coil's former

Technical Field

The invention belongs to the technical field of motors, and particularly relates to a forming device of a motor coil.

Background

With the increase of the automobile demand, the development speed of the automobile industry is gradually increased, and the development of automobile part production enterprises is also driven.

The quantity of the automobile demand is gradually increased, the technical standard and the quality are improved, and the traditional automobile part production process cannot meet the requirements of actual high quality, high reliability and batch production.

The forming equipment of the motor coil is used as important equipment in the production process of the automobile motor rotor coil, the quality of the forming equipment determines the overall performance of the starter, and the forming equipment of the motor coil is used as special equipment for processing a starter rotor winding and is indispensable equipment for enterprises producing automobile starters.

The former of motor coil on the existing market all has a commonality, and the size is big promptly, and the complete machine adaptation is poor, and degree of automation is not high, and especially during the unloading after the shaping, can't realize the transfer machine unloading, needs extra auxiliary assembly to carry out the unloading to influence whole shaping efficiency.

Disclosure of Invention

The invention aims to provide a forming device of a motor coil, which has higher working efficiency.

The purpose of the invention is realized as follows:

a former of motor coil which characterized in that: comprises a feeding mechanism, a stripping mechanism, a conveying mechanism, a cutting mechanism and a forming mechanism which are arranged on a frame in sequence along the transverse direction, the forming mechanism comprises a frame body, an upper die and a lower die which are slidably arranged in the frame body, the upper die can slide in a reciprocating manner along the vertical direction, the lower die can longitudinally slide in a reciprocating manner, the left side and the right side of the upper end surface of the frame body are both provided with a limiting block, the limiting block is provided with a limiting groove which penetrates the limiting block along the transverse direction and is provided with an opening at the rear end, the copper wire is conveyed into the limiting groove by the conveying mechanism and is cut by the cutting mechanism, the lower mould is along vertically to leaning on and buckling the copper line with the copper line middle part that the spacing groove was arranged in to the in-process of sliding forward and both ends, moves under the mould to the lower mould, and the both ends of copper line and all break away from corresponding spacing groove and hug closely in the left and right sides face with the lower mould this moment, go up the mould and the cooperation of lower mould can extrude the copper line of pasting on the lower mould into required shape.

The draw-in groove is arranged on the two sides of the lower die in the forming equipment of the motor coil, the draw-in groove is matched with the limiting block, automatic demolding of copper wires is achieved, the limiting block can play the role of a fixed copper wire before forming and can play the role of demolding after the copper wires are formed, the structure is simple, the demolding effect is good, extra equipment is not needed to assist, the blanking speed is higher, and the whole forming efficiency is favorably improved.

In foretell former of electric machine coil, the left side and the right side of lower mould are all outwards protrusion formation side protruding edge, the profile along the lower mould on the side protruding edge is equipped with the draw-in groove, protruding edge before the front side of lower mould is outwards protrusion formation, the width on preceding protruding edge equals the width of draw-in groove, the both ends on preceding protruding edge meet with two draw-in grooves respectively, the copper line can be in the embedding draw-in groove and hug closely in the last side on preceding protruding edge under the extrusion of last mould.

The side convex edge can limit the two ends of the copper wire, so that the two ends of the formed copper wire can be clamped into the clamping grooves to realize shaping and positioning; the in-process that can also advance at the lower mould leans on with the preceding terminal surface of kicking block, avoids preceding protruding edge or design groove to lead to the deformation because of the extrusion is excessive, influences the design effect to the copper line.

In the above molding device for the motor coil, a groove for passing a copper wire is provided on an inner side surface of the limiting block, the groove is communicated with the limiting groove, the inner side surface of the limiting block is attached to the left side surface or the right side surface of the lower die, and a lower side surface of the limiting block is attached to an upper side surface of the side convex edge; the distance between the upper side surface of the side convex edge and the lower side surface of the limiting block positioned on the upper side of the side convex edge is smaller than the difference between the diameter of the copper wire and the depth of the clamping groove.

The design that the distance between the upper side surface of the side protrusion edge and the lower side surface of the limiting block positioned on the upper side of the side protrusion edge is smaller than the difference between the diameter of the copper wire and the depth of the groove of the clamping groove can ensure that the limiting block can smoothly prop the two ends of the formed copper wire, so that the copper wire can be smoothly separated from the lower die, and automatic blanking is realized.

In foretell electrical coil's former, the front end of support body is fixed with the kicking block, be equipped with the design groove of the V style of calligraphy that runs through the kicking block along vertical direction on the rear end face of kicking block, the front end of lower mould be with design groove complex V style of calligraphy, the front end of lower mould can stretch into the design inslot and be the V style of calligraphy with the middle part extrusion of copper line, the leading flank on preceding protruding edge cooperatees with the shape in V type groove and can support with the cell wall in V type groove and lean on, the preceding terminal surface on the protruding edge of side can support with the rear end face of kicking block and lean on.

In foretell electrical coil's former, high both sides are low to be wavy in the middle of the up end on preceding protruding edge, the front end shaping of going up the mould has the lug, the leading flank of lug with the cooperation of V type groove, the lower tip of lug can stretch into in the gap between the preceding terminal surface of lower mould and the cell wall in V type groove and the lower terminal surface shape of lug cooperatees with the shape of preceding protruding edge up end, the lug can compress tightly the copper line with last mould and be fixed in preceding protruding edge.

In foretell electric coil's former, the lower extreme of support body is fixed with the hopper that the slope set up, the upper end of hopper is located the mould under and is located the downside of lower mould, the lower extreme of hopper stretches out from the side of frame, the downside of hopper lower extreme is equipped with the containing box that is used for collecting the copper line.

In foretell electric coil's former, feed mechanism includes the riser and the diaphragm of rectangle, the length direction of riser and diaphragm all is parallel with copper line moving direction, all be equipped with at least three first leading wheel and second leading wheel on riser and the diaphragm, the length direction interval setting of riser and diaphragm is all followed to first leading wheel and second leading wheel, the width direction adjustable fixation of riser or diaphragm at place can all be followed to first leading wheel and second leading wheel, first leading wheel and relative and crisscross setting of second leading wheel.

This feed mechanism presss from both sides the copper line in vertical direction through the riser and tightly straightens, presss from both sides the copper line in the horizontal direction through the diaphragm and tightly straightens, and adjustable first leading wheel and second leading wheel can be through adjusting position between them, and the messenger presss from both sides tightly and straightens the effect better.

In foretell former of electric machine coil, the diaphragm is located to shell and is drawn between mechanism and the riser, the diaphragm is close to shell one side of drawing the mechanism and is equipped with ejection of compact guide ring, one side that the diaphragm was kept away from to the riser is equipped with the feeding guide ring.

The design of above-mentioned feeding guide ring and ejection of compact guide ring not only can make the feeding more smooth and easy with the ejection of compact, can also avoid scraping the flower with the copper line at feeding or ejection of compact in-process, influences the result of use.

The working principle of the forming equipment of the motor coil is as follows: firstly, a copper wire enters a stripping mechanism from a winding frame through a feeding mechanism, the stripping mechanism strips and strips the copper wire to remove the paint skin, then the copper wire passes through a cutting mechanism to be conveyed into a forming mechanism in a segmental manner through a conveying mechanism, the cutting mechanism works to cut the copper wire after the copper wire completely falls into the forming mechanism, at the moment, two ends of the copper wire are respectively positioned in limiting grooves of limiting blocks, a driving piece drives a lower die to move forwards along the longitudinal direction, the front end of the lower die is connected with the middle part of the copper wire and drives the copper wire to move forwards continuously, two ends of the copper wire are separated from the limiting grooves and are tightly attached to the left side wall and the right side wall of the lower die through the guide of a groove, the lower die continues to move forwards until a front convex edge of the lower die abuts against a forming groove of a top block, at the moment, the middle part of the copper wire is extruded and fixed between the front side surface, the convex block of the upper die is inserted into a gap formed between the lower die and the top block until the copper wire is extruded and fixed on the upper side surface of the front convex edge, at the moment, the middle part of the copper wire is extruded to be in the same shape as the upper side surface of the front convex edge or the lower side surface of the convex block in the vertical direction, and meanwhile, the copper wires positioned at the left side and the right side of the lower die are pressed downwards to be embedded into the clamping grooves of the side convex edges in the downward moving process of the upper die; go up the mould and shift up after that, the lower mould is along vertically removing backward simultaneously for sheltering from of stopper, copper line both ends after the shaping are blockked behind the leading flank of touchhing the stopper and can't continue to move backward along with the lower mould, when the lower mould continues to move backward and remove the stopper rear side, copper line after the shaping can break away from and fall to the hopper upper end that is located the below and along the hopper in the containing box at this in-process and lower mould, accomplish whole copper line forming process.

Compared with the prior art, the invention has the outstanding and beneficial technical effects that:

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural view of the cutting mechanism and the molding mechanism of the present invention.

Fig. 3 is a schematic view of the upper and lower dies of the present invention.

Fig. 4 is a cross-sectional view of an upper die and a lower die of the present invention.

Fig. 5 is a schematic structural diagram of the feeding mechanism of the present invention.

In the figure, 1, a feeding mechanism; 11. a vertical plate; 12. a transverse plate; 13. a first guide wheel; 14. a second guide wheel; 15. a feed guide ring; 16. a discharge guide ring; 2. a stripping mechanism; 3. a conveying mechanism; 4. a cutting mechanism; 5. a molding mechanism; 51. a frame body; 52. an upper die; 521. a bump; 53. a lower die; 531. a side convex edge; 532. a card slot; 533. a front convex edge; 54. a limiting block; 541. a limiting groove; 542. a groove; 55. a top block; 551. a shaping groove; 6. a frame; 7. copper wire.

Detailed Description

The invention will be further described in the following with reference to specific embodiments thereof, with reference to the accompanying drawings, in which figures 1 to 5:

the forming equipment of the motor coil comprises a feeding mechanism 1, a stripping mechanism 2, a conveying mechanism 3, a cutting mechanism 4 and a forming mechanism 5 which are arranged on a rack 6 in sequence along the transverse direction, wherein the forming mechanism 5 comprises a rack body 51, an upper die 52 and a lower die 53 which are arranged in the rack body 51 in a sliding manner, the upper die 52 can slide in a reciprocating manner along the vertical direction, the lower die 53 can slide in a reciprocating manner along the longitudinal direction, the left side and the right side of the upper end surface of the rack body 51 are both provided with limit blocks 54, the limit blocks 54 are provided with limit grooves 541 which penetrate through the limit blocks 54 along the transverse direction and are provided with openings at the rear ends, copper wires 7 are conveyed into the limit grooves 541 through the conveying mechanism 3 and are cut by the cutting mechanism 4, the lower die 53 can abut against the middle parts of the copper wires 7 with the two ends arranged in the limit grooves 541 and bend the copper wires 7 along the longitudinal forward sliding process until the lower die 53 moves to be under the, the upper die 52 and the lower die 53 are matched to extrude the copper wire 7 attached to the lower die 53 into a desired shape. The draw-in groove 532 is arranged in the two sides of the lower die 53 in the forming equipment of the motor coil, the draw-in groove 532 is matched with the limiting block 54, automatic demoulding of the copper wire 7 is realized, the limiting block 54 can play the role of fixing the copper wire 7 before forming, the demoulding effect can be played after the copper wire 7 is formed, the structure is simple, the demoulding effect is good, extra equipment is not needed for assistance, the blanking speed is higher, and the whole forming efficiency is favorably improved.

As shown in fig. 2-4, the left side and the right side of the lower mold 53 are both protruded outwards to form a side protruding edge 531, the upper side surface of the side protruding edge 531 is provided with a clamping groove 532 along the contour of the lower mold 53, the front side of the lower mold 53 is protruded outwards to form a front protruding edge 533, the width of the front protruding edge 533 is equal to the width of the clamping groove 532, two ends of the front protruding edge 533 are respectively connected with the two clamping grooves 532, and the copper wire 7 can be embedded into the clamping groove 532 under the extrusion of the upper mold 52 and is tightly attached to the upper side surface of the front protruding edge 533; a groove 542 for the copper wire 7 to pass through is arranged on the inner side surface of the limiting block 54, the groove 542 is communicated with the limiting groove 541, the inner side surface of the limiting block 54 is attached to the left side surface or the right side surface of the lower die 53, and the lower side surface of the limiting block 54 is close to the upper side surface of the side convex edge 531; the distance between the upper side of the side protruding edge 531 and the lower side of the stopper 54 located on the upper side of the side protruding edge 531 is smaller than the difference between the diameter of the copper wire 7 and the groove depth of the engaging groove 532.

The side convex edge 531 can limit the two ends of the copper wire 7, so that the two ends of the formed copper wire 7 can be clamped into the clamping groove 532 to realize shaping and positioning; the front convex edge 533 or the shaping groove 551 can be prevented from being deformed due to excessive extrusion to influence the shaping effect of the copper wire 7 by abutting against the front end surface of the top block 55 in the process that the lower die 53 moves forwards; the design that the distance between the upper side surface of the side convex edge 531 and the lower side surface of the limiting block 54 positioned on the upper side of the side convex edge 531 is smaller than the difference between the diameter of the copper wire 7 and the groove depth of the clamping groove 532 can ensure that the limiting block 54 can smoothly support the two ends of the formed copper wire 7, so that the copper wire 7 can smoothly break away from the lower die 53, and automatic blanking is realized.

Further, a top block 55 is fixed at the front end of the frame body 51, a V-shaped shaping groove 551 which penetrates through the top block 55 along the vertical direction is arranged on the rear end face of the top block 55, the front end of the lower die 53 is V-shaped and matched with the shaping groove 551, the front end of the lower die 53 can extend into the shaping groove 551 and extrude the middle part of the copper wire 7 into a V shape, the front side face of the front convex edge 533 is matched with the shape of the V-shaped groove and can abut against the groove wall of the V-shaped groove, and the front end face of the side convex edge 531 can abut against the rear end face of the top block 55; the middle of the upper end face of the front convex edge 533 is high, the two sides of the upper end face of the front convex edge 533 are low, the upper end of the upper die 52 is formed with a convex block 521, the front side face of the convex block 521 is matched with the V-shaped groove, the lower end part of the convex block 521 can extend into a gap between the front end face of the lower die 53 and the groove wall of the V-shaped groove, the shape of the lower end face of the convex block 521 is matched with that of the upper end face of the front convex edge 533, and the convex block 521 can press and fix the copper wire.

Further, the lower extreme of support body 51 is fixed with the hopper that the slope set up, and the upper end of hopper is located and goes up mould 52 under and be located the downside of lower mould 53, and the lower extreme of hopper stretches out from the side of frame 6, and the downside of hopper lower extreme is equipped with the containing box that is used for collecting copper line 7.

As shown in fig. 5, the feeding mechanism 1 comprises a rectangular vertical plate 11 and a rectangular transverse plate 12, the vertical plate 11 and the transverse plate 12 are parallel to the moving direction of the copper wire 7 in length direction, at least three first guide wheels 13 and at least three second guide wheels 14 are arranged on the vertical plate 11 and the transverse plate 12 in length direction, the first guide wheels 13 and the second guide wheels 14 are arranged along the vertical plate 11 and the transverse plate 12 in length direction at intervals, the first guide wheels 13 and the second guide wheels 14 can be adjusted and fixed along the width direction of the vertical plate 11 or the transverse plate 12, and the first guide wheels 13 and the second guide wheels 14 are arranged oppositely and in a staggered manner; the transverse plate 12 is arranged between the peeling and pulling mechanism 2 and the vertical plate 11, a discharging guide ring 16 is arranged on one side of the transverse plate 12 close to the peeling and pulling mechanism 2, and a feeding guide ring 15 is arranged on one side of the vertical plate 11 far away from the transverse plate 12. The feeding mechanism 1 clamps and straightens the copper wire 7 in the vertical direction through the vertical plate 11, clamps and straightens the copper wire 7 in the horizontal direction through the transverse plate 12, and the adjustable first guide wheel 13 and the adjustable second guide wheel 14 can enable the clamping and straightening effects to be better by adjusting the positions of the two; above-mentioned

feeding guide ring

15 and 16 design of ejection of compact guide ring not only can make the feeding more smooth and easy with the ejection of compact, can also avoid scraping the flower with copper line 7 at feeding or ejection of compact in-process, influence the result of use.

When the forming equipment of the motor coil works, firstly, a copper wire 7 enters a stripping and pulling mechanism 2 from a bobbin through a feeding mechanism 1, the stripping and pulling mechanism 2 strips and pulls the copper wire 7 to remove a varnish, then the copper wire 7 is conveyed into a forming mechanism 5 through a cutting mechanism 4 which is penetrated by a conveying mechanism 3 in a section and fall way, when the copper wire 7 completely falls into the forming mechanism 5, the cutting mechanism 4 works to cut the copper wire 7, at the moment, two ends of the copper wire 7 are respectively positioned in limiting grooves 541 of a limiting block 54, a driving piece drives a lower die 53 to move forwards along the longitudinal direction, the front end of the lower die 53 is connected with the middle part of the copper wire 7 and drives the copper wire 7 to move forwards continuously, two ends of the copper wire 7 are separated from the limiting grooves 541 and tightly attached to the left side wall and the right side wall of the lower die 53 through the guide of a groove 542, the lower die 53 continues to move forwards until a front convex edge 533 of the lower die 53 abuts against a forming groove 551 of an ejector block 55, at the moment The upper die 52 is in a V shape, then the upper die 52 moves downwards under the action of a driving piece, the convex block 521 of the upper die 52 is inserted into a gap formed between the lower die 53 and the top block 55 until the copper wire 7 is extruded and fixed on the upper side surface of the front convex edge 533, at the moment, the middle part of the copper wire 7 is extruded to be in the same shape as the upper side surface of the front convex edge 533 or the lower side surface of the convex block 521 in the vertical direction, and meanwhile, the copper wires 7 positioned on the left side and the right side of the lower die 53 are also pressed downwards to be embedded into the clamping grooves 532 of the side convex edges 531 in; go up mould 52 and move up after that, lower mould 53 moves along vertically backward simultaneously for spacing 54 shelters from, the copper line 7 both ends after the shaping are blockked behind the leading flank that runs into spacing 54 can't continue to move backward along with lower mould 53, when lower mould 53 continues to move backward and move to the spacing 54 rear side, copper line 7 after the shaping can break away from and fall to the hopper upper end that is located the below and along the hopper in this in-process with lower mould 53, accomplish whole copper line 7 forming process.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. A former of motor coil which characterized in that: including along transversely locating feed mechanism (1) on frame (6) in proper order, shelling and drawing mechanism (2), conveying mechanism (3), tailoring mechanism (4) and forming mechanism (5), forming mechanism (5) include support body (51) and slidable locate last mould (52) and lower mould (53) in support body (51), it can follow vertical direction reciprocating slide to go up mould (52), lower mould (53) can follow vertical reciprocating slide, the left and right sides of support body (51) up end all is equipped with stopper (54), be equipped with on stopper (54) along transversely running through and rear end open-ended spacing groove (541) stopper (54), copper line (7) are carried in spacing groove (541) and are decided it by tailoring mechanism (4) through conveying mechanism (3), lower mould (53) are followed vertically toward the preceding slip in-process can arrange copper line (7) middle part of spacing groove (541) in with both ends and are leaned on and buckle copper line (7), until the lower die (53) moves to the position right below the upper die (52), the two ends of the copper wire (7) are separated from the corresponding limiting grooves (541) and cling to the left side surface and the right side surface of the lower die (53), and the upper die (52) and the lower die (53) are matched to extrude the copper wire (7) pasted on the lower die (53) into a required shape.

2. The molding apparatus of an electric machine coil as set forth in claim 1, wherein: the left side and the right side of lower mould (53) all outwards bulge and form protruding edge of side (531), the profile of the last side edge of protruding edge of side (531) along lower mould (53) is equipped with draw-in groove (532), protruding edge (533) before the preceding side direction of lower mould (53) is protruding to form, the width on preceding protruding edge (533) equals the width of draw-in groove (532), the both ends on preceding protruding edge (533) meet with two draw-in grooves (532) respectively, copper line (7) can be in embedding draw-in groove (532) and hug closely in the last side of preceding protruding edge (533) under the extrusion of last mould (52).

3. The molding apparatus of an electric machine coil as set forth in claim 2, wherein: a groove (542) for a copper wire (7) to pass through is formed in the inner side face of the limiting block (54), the groove (542) is communicated with the limiting groove (541), the inner side face of the limiting block (54) is attached to the left side face or the right side face of the lower die (53), and the lower side face of the limiting block (54) is attached to the upper side face of the side convex edge (531); the distance between the upper side surface of the side convex edge (531) and the lower side surface of the limiting block (54) positioned on the upper side of the side convex edge (531) is smaller than the difference between the diameter of the copper wire (7) and the groove depth of the clamping groove (532).

4. The apparatus for forming a coil of an electric machine according to claim 3, wherein: the front end of the frame body (51) is fixed with a top block (55), a V-shaped shaping groove (551) penetrating through the top block (55) along the vertical direction is formed in the rear end face of the top block (55), the front end of the lower die (53) is in a V shape matched with the shaping groove (551), the front end of the lower die (53) can extend into the shaping groove (551) and extrude the middle of a copper wire (7) into a V shape, the front side face of the front convex edge (533) is matched with the shape of the V-shaped groove and can be abutted against the groove wall of the V-shaped groove, and the front end face of the side convex edge (531) can be abutted against the rear end face of the top block (55).

5. The apparatus for forming a coil of an electric machine according to claim 4, wherein: high both sides are low and are wavy in the middle of the up end of preceding protruding edge (533), the front end shaping of going up mould (52) has lug (521), the leading flank of lug (521) with the cooperation of V type groove, the lower tip of lug (521) can stretch into in the gap between the cell wall in preceding terminal surface of lower mould (53) and the V type groove and the lower terminal surface shape of lug (521) and the shape cooperation of preceding protruding edge (533) up end, lug (521) can compress tightly copper line (7) along with last mould (52) and be fixed in preceding protruding edge (533).

6. An apparatus for forming a coil of an electric machine according to any one of claims 1 to 5, wherein: the lower extreme of support body (51) is fixed with the hopper that the slope set up, the upper end of hopper is located and goes up mould (52) under and is located the downside of lower mould (53), the lower extreme of hopper stretches out from the side of frame (6), the downside of hopper lower extreme is equipped with the containing box that is used for collecting copper line (7).

7. An apparatus for forming a coil of an electric machine according to any one of claims 1 to 5, wherein: feed mechanism (1) includes riser (11) and diaphragm (12) of rectangle, the length direction of riser (11) and diaphragm (12) all is parallel with copper line (7) moving direction, all be equipped with at least three first leading wheel (13) and second leading wheel (14) on riser (11) and diaphragm (12), the length direction interval setting of riser (11) and diaphragm (12) is all followed to first leading wheel (13) and second leading wheel (14), the width direction adjustable fixed of place riser (11) or diaphragm (12) can all be followed to first leading wheel (13) and second leading wheel (14), relative and crisscross setting of first leading wheel (13) and second leading wheel (14).

8. The apparatus for forming a coil of an electric machine according to claim 7, wherein: diaphragm (12) are located and are shelled and draw between mechanism (2) and riser (11), one side that diaphragm (12) are close to shell and draw mechanism (2) is equipped with ejection of compact guide ring (16), one side that diaphragm (12) were kept away from in riser (11) is equipped with feeding guide ring (15).