CN109226656B

CN109226656B - Feeding device for cold header

Info

Publication number: CN109226656B
Application number: CN201811173746.7A
Authority: CN
Inventors: 钱成森
Original assignee: Zhejiang Qiangli Fastener Co ltd
Current assignee: Zhejiang Qiangli Fastener Co ltd
Priority date: 2018-10-09
Filing date: 2018-10-09
Publication date: 2020-05-19
Anticipated expiration: 2038-10-09
Also published as: CN109226656A

Abstract

The invention relates to the technical field of cold headers, and aims to provide a feeding device for a cold header, which comprises a rack, a conveyor belt and a conveying groove, wherein the conveyor belt is arranged on the rack; a plurality of magnets are arranged on the conveying belt at intervals; the conveying groove is arranged above the conveying belt, and the bottom of the conveying groove is attached to the magnets on the conveying belt; a limiting mechanism and a cleaning mechanism are arranged on the frame above the blanking end; the limiting mechanism comprises a pressing cylinder and a pressing piece, and the position of the pressing piece corresponds to the position of the magnet; the cleaning mechanism comprises a cleaning nozzle connected with an air compressor. The conveying trough is used for separating the conveying belt from the conveyed fasteners, and the adsorption effect of the magnet is used for driving the fasteners to move through the conveying trough, so that metal chips and lubricating oil can fall into the conveying trough completely, the environment cannot be polluted, and the conveying trough is convenient to clean; and because no gap or pit slot exists in the conveying groove, metal scraps cannot be accumulated, so that the conveying of the fastening piece cannot be hindered, and the conveying is more stable.

Description

Feeding device for cold header

Technical Field

The invention relates to the technical field of cold headers, in particular to a feeding device for a cold header.

Background

The cold header is special equipment which takes a pier as a main part and is specially used for producing fasteners such as nuts and bolts in batches. After the nuts and bolts are produced, the formed products are generally conveyed by a conveyor belt. In the prior art, fasteners such as nuts and bolts are easy to produce metal excess materials such as metal scraps in the manufacturing process, so that the metal scraps are fully distributed on products and a conveying belt.

At present, a chinese patent document with an authorization notice number of CN206153493U in the prior art discloses a feeding mechanism for a cold header, which includes a frame and an annular conveying line arranged on the frame, wherein the left side of the annular conveying line is a first rotary end, the right side of the annular conveying line is a second rotary end, the top of the first rotary end is a feeding end, the right side of the second rotary end is a discharging end, a plurality of magnets are uniformly distributed on the annular conveying line, the magnets are clamped and mounted on the annular conveying line, and a gap is formed between adjacent magnets; discharge end department is equipped with a ejection of compact board, ejection of compact board through an extension support install in the right side of frame, the right side slope of ejection of compact board sets up downwards, the left end of ejection of compact board set up in the below of annular transfer chain top surface, just the distance is 1 mm ~ 7 mm between the left end of ejection of compact board and the adjacent magnet. And a scraping plate is further arranged below the second rotating end and made of a non-metal material, the scraping plate is perpendicular to the bottom surface of the annular conveying line, and the top surface of the scraping plate is in contact with the magnet. Through the setting of scraping the flitch, can strike off the metal fillings on with magnet by scraping the flitch, prevent piling up of metal fillings on the magnet.

The above prior art solutions have the following drawbacks: 1. although metal scraps on the surfaces of the magnets are scraped by the scraper plate, gaps exist among the magnets, and the metal scraps in the gaps are difficult to remove; 2. the arrangement of the discharge plate enables the manufactured fasteners to fall onto the discharge plate from the annular conveying line when passing through, but the distance between the discharge plate and the magnet is 1 mm-7 mm, metal scraps on the surface of the magnet are easily blocked by the discharge plate and accumulated at the front end of the discharge plate when passing through, and a scraping plate arranged below the second rotary end cannot effectively play a role, so that the fasteners such as bolts, nuts and the like are difficult to move onto the discharge plate; especially, the nut can not be rolled like a bolt when being horizontally placed, and is more difficult to move to the discharging plate.

Disclosure of Invention

The invention aims to provide a feeding device for a cold header, which has the effects of facilitating the cleaning of a conveying belt and enabling the conveying belt to be more stable.

The technical purpose of the invention is realized by the following technical scheme:

a feeding device for a cold header comprises a rack and a conveying mechanism arranged on the rack, wherein the conveying mechanism comprises a conveyor belt and a conveying groove; a plurality of magnets are arranged on the conveying belt at intervals; the conveying groove is arranged above the conveying belt, and the bottom of the conveying groove is attached to the magnets on the conveying belt; one end of the conveyor belt is a blanking end, and a limiting mechanism and a cleaning mechanism are arranged above the conveying groove at the blanking end on the rack; the limiting mechanism comprises a lower pressing cylinder, a lower pressing plate arranged at the end part of a piston rod of the lower pressing cylinder and a lower pressing piece arranged at the bottom of the lower pressing plate, and the position of the lower pressing piece corresponds to that of the magnet; the cleaning mechanism comprises a cleaning nozzle connected with the air compressor, and the cleaning nozzle is aligned to the position, corresponding to the lower pressing piece, on the conveying groove.

Through adopting above-mentioned technical scheme, utilize the conveyer trough to separate the fastener of conveyer belt and transport, the adsorption effect of recycling magnet separates the conveyer trough and drives the fastener motion for the metal fillings that the cold-heading produced and the lubricating oil that attaches on the fastener surface can all fall on the conveyer trough in, can not cause the pollution to the environment, and is convenient for clear up. When the fastener moves to the blanking end, the lower pressing cylinder is used for driving the lower pressing plate to move downwards and driving the lower pressing piece to limit the fastener downwards, and meanwhile, the cleaning nozzle is used for spraying compressed air towards the fastener to clean metal chips and lubricating oil on the surface of the fastener; at the moment, the conveyor belt continues to run, so that the magnet is separated from the fastening piece, the metal chips adsorbed on the surface of the fastening piece lose adsorption force, and the cleaning effect of the cleaning nozzle is improved; after cleaning, the air cylinder is pressed downwards to withdraw the piston rod, so that the cleaned fastener can continue to move forwards under the action of a subsequent magnet until the conveyor belt is separated from the conveying groove; and because no gap or pit slot is formed in the conveying groove, metal scraps cannot be accumulated in the conveying process, so that the conveying of the fastening piece cannot be hindered, and the conveying is more stable.

The invention is further configured to: the conveying path of the conveying belt is in a slide shape which is horizontal, then extends upwards in an inclined way and then extends horizontally, and the blanking end is positioned at the horizontal section at the topmost end; the conveying trough is characterized in that a leveling baffle is arranged on the inclined section of the conveying trough, and the distance between the leveling baffle and the conveying trough is larger than the thickness of the fastener when the fastener is flatly placed and smaller than the height of the fastener when the fastener is erected.

By adopting the technical scheme, when the magnet adsorbs and drives the fastener to move, the fastener can be in a vertical state, and the fasteners can be stacked up and down under the action of the magnet, so that the downward movement of the pressing piece is hindered under the two conditions, and the pressing cylinder is damaged; the spreading baffle can push down the fasteners in the vertical state or limit the fasteners to advance, and can spread out a plurality of stacked fasteners, so that the fasteners losing magnetic adsorption or being too small in adsorption force can fall down along the slope, and the phenomenon of stacking cannot be caused.

The invention is further configured to: the pressing piece is in a needle shape with a conical end, and the diameter of the pressing piece is smaller than the aperture of the central hole in the nut.

By adopting the technical scheme, when the nut is conveyed, the nut can be limited by penetrating the pressing piece into the central hole of the nut downwards without pressing the nut downwards, so that the surface of the conveying groove is prevented from being deformed or seriously abraded due to the pressure applied to the conveying groove; the conical end part of the lower pressing piece has a guiding function, so that the lower pressing piece can smoothly penetrate into the central hole by adhering to the conical surface even if the nut has certain position deviation relative to the magnet; the diameter of the lower pressing piece is smaller than the aperture of the central hole in the nut, so that the nut can rotate relative to the lower pressing piece, and the surface of the nut is in a regular hexagon shape, so that when the cleaning nozzle sprays air to the nut, the nut can rotate rapidly under the impact of compressed air, the nut is cleaned in all directions by utilizing the compressed air and centrifugal force, and oil stains and metal chips are removed; and cold heading processing can lead to the nut fracture occasionally to produce the breach, then when this type of substandard product nut rotated under the impact of clean nozzle, the lower pressure piece can pass in the breach for substandard product nut loses spacing and is blown away, thereby reaches certain screening effect.

The invention is further configured to: and a limiting groove matched with the end part of the lower pressing piece is arranged below the lower pressing piece on the conveying groove.

Through adopting above-mentioned technical scheme, utilize the spacing groove to carry on spacingly to the tip of pushing down the piece, the structural stability of piece is pushed down in the reinforcing, prevents that the nut from rotating fast and causing the piece of pushing down to buckle or split.

The invention is further configured to: the magnet is annular, and the internal diameter of magnet is greater than the internal diameter of nut.

Through adopting above-mentioned technical scheme for the metal fillings in the nut centre bore only can adsorb on the pore wall and can not adsorb on the conveyer trough of centre bore intermediate position, avoid piling up in the spacing groove when the nut moves the spacing groove position, lead to pushing down the unable embedding spacing inslot of tip of piece, lead to even that the tip of piece is impaired down.

The invention is further configured to: the discharging device is characterized in that a discharging nozzle connected with an air compressor is arranged above the conveying groove at the discharging end on the rack, the discharging nozzle is arranged on one side, away from the discharging end, of the lower pressing piece and is aligned to the position, corresponding to the lower pressing piece, on the conveying groove.

Through adopting above-mentioned technical scheme, pushing down the piece and rising after the nut cleanness finishes, utilizing discharge nozzle to clean nut blowout compressed air that finishes, discharge the nut from the unloading end of conveyer trough, avoid the nut after the cleanness and contact with uncleaned nut to lead to being infected with greasy dirt and iron fillings again.

The invention is further configured to: the cleaning mechanism further comprises a waste trough with an opening facing the lower pressing piece, and the waste trough and the cleaning nozzle are oppositely arranged on two sides of the lower pressing piece.

Through adopting above-mentioned technical scheme, set up the opposite at clean nozzle with the dirty tank for the greasy dirt that is cleared up and iron fillings, adsorb other nuts on the nut, or have the substandard product nut of breach can get into the dirty tank, carry out recycle.

The invention is further configured to: the waste material groove is fixedly connected with the lower pressing plate.

Through adopting above-mentioned technical scheme for the dirty tank rises with the lower pressure member is synchronous, and the clean back dirty tank that finishes rises, avoids causing the hindrance to subsequent nut.

The invention is further configured to: and a contact piece which extends downwards and outwards in an inclined mode is arranged at the opening of the waste material groove along the bottom edge, and the contact piece is made of elastic materials.

Through adopting above-mentioned technical scheme, utilize the contact piece downwards and the conveyer trough contact, the contact piece extrudees the conveyer trough and takes place deformation when the holding down plate falls to the minimum, avoids appearing the space between dirty tank and the conveyer trough.

The invention is further configured to: the conveying belt is a chain plate conveying belt, a plurality of magnets on the chain plates are arranged side by side, and a plurality of lower pressing pieces are arranged corresponding to the cleaning nozzles; the chain plates provided with the magnets are separated from each other by one or more chain plates without magnets.

By adopting the technical scheme, the conveying precision of the chain plate conveying belt is higher than that of a belt conveying belt, and the position of the magnet can be accurately positioned, so that the lower pressing piece can accurately limit the nut; set up a plurality of magnets side by side on same link joint and can clean a plurality of nuts simultaneously, and magnet sets up along the direction of delivery interval, then need not to stop the link joint conveyer belt that operates when cleaning the nut, the interval that utilizes to carry cleans, the ejection of compact can.

In conclusion, the beneficial effects of the invention are as follows:

1. the conveying groove is utilized to separate the conveying belt from the conveyed fasteners, and the adsorption effect of the magnet is utilized to separate the conveying groove from the conveying groove to drive the fasteners to move, so that metal chips generated by cold heading and lubricating oil attached to the surfaces of the fasteners can all fall into the conveying groove, the environment cannot be polluted, and the conveying groove is free of gaps and pits, so that the conveying groove is convenient to clean, the metal chips cannot be accumulated in the conveying process, the conveying of the fasteners cannot be hindered, and the conveying is more stable;

2. the diameter of the lower pressing piece is smaller than the aperture of the central hole in the nut, so that the nut can rotate relative to the lower pressing piece, and the surface shape of the nut is regular hexagon, so that when the cleaning nozzle sprays air to the nut, the nut can rotate rapidly under the impact of compressed air, the nut is cleaned in all directions by utilizing the compressed air and centrifugal force, and oil stains and metal chips are removed; and cold heading processing can lead to the nut fracture occasionally to produce the breach, then when this type of substandard product nut rotated under the impact of clean nozzle, the lower pressure piece can pass in the breach for substandard product nut loses spacing and is blown away, thereby reaches certain screening effect.

Drawings

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

FIG. 2 is a schematic view of the construction of the link belt and magnets of the present invention;

FIG. 3 is a schematic cross-sectional structural view of the present invention;

FIG. 4 is a schematic view of the overall structure of the limiting mechanism and the waste chute of the present invention;

fig. 5 is an enlarged view of a portion a in fig. 3, showing the limiting groove and the pressing member.

Reference numerals: 1. a frame; 11. a discharge nozzle; 2. a chain plate conveyor belt; 3. a conveying trough; 31. paving a baffle plate; 32. a limiting groove; s, a blanking end; 4. a magnet; 5. a limiting mechanism; 51. pressing down the air cylinder; 52. a lower pressing plate; 53. a push-down member; 6. a cleaning mechanism; 61. cleaning the nozzle; 62. a waste chute; 621. a coarse filter screen; 622. and a contact sheet.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiment discloses a feeding device for a cold header, which comprises a frame 1 and a conveying mechanism mounted on the frame 1, as shown in fig. 1 and 2. The conveying mechanism comprises a chain plate conveying belt 2 driven by a speed reduction motor and a conveying groove 3 fixed above the chain plate conveying belt 2, a plurality of magnets 4 are fixed on a chain plate of the chain plate conveying belt 2 side by side, the conveying groove 3 is made of stainless steel, the bottom of the conveying groove 3 is attached to the magnets 4 on the chain plate conveying belt 2, and when nuts fall into the conveying groove 3, the nuts can be attached to the conveying groove 3 by the magnets 4; when the chain conveyor 2 is in operation, the nuts can also be attracted and moved relative to the conveying trough 3.

Because cold heading machine needs a large amount of lubricating oil to lubricate and cool down the mechanism when the operation for a large amount of lubricating oil can be stained with on the surface of nut, and lubricating oil can be glutinous metal clout such as the metal fillings that some processing formed on the nut surface. Therefore, the conveying groove 3 is utilized to separate the chain plate conveyor belt 2 from the conveyed nuts, so that metal scraps and lubricating oil attached to the surfaces of the nuts can all fall into the conveying groove 3, and the environment is not polluted; and because no gap or pit slot is formed in the conveying groove 3, metal scraps cannot be accumulated in the conveying process, so that the conveying of nuts cannot be hindered, the conveying is more stable, the conveying groove 3 is also simple and convenient to clean, and the service life of the chain plate conveying belt 2 can be effectively prolonged.

As shown in fig. 2 and 3, the conveying path of the link belt 2 is in the form of a horizontal slide extending obliquely upward and horizontally again. The horizontal section at the bottom of the conveying groove 3 is communicated with the discharge end of the cold header, the tail end of the conveying groove is provided with an oil outlet, and the nut subjected to cold heading falls into the conveying groove 3 with the horizontal bottom and is adsorbed by the magnet 4 to move upwards; the horizontal section at the topmost end of the conveying trough 3 is a blanking end s, and the tail end of the conveying trough 3 at the blanking end s is bent downwards and can be connected with an automatic oil removing machine. The inclined section of the conveying trough 3 is fixed with a leveling baffle 31 through bolts, the leveling baffle 31 is obliquely arranged towards the direction far away from the conveying trough 3, the inclination angle of the leveling baffle 31 is larger than that of the inclined section of the chain plate conveying belt 2, and the distance between the bottommost part of the leveling baffle 31 and the conveying trough 3 is larger than the thickness of the nuts when the nuts are flatly placed and smaller than the height of the nuts when the nuts are erected. Because the nuts can be in the vertical state when the magnets 4 attract and drive the nuts to move, and the nuts can be stacked up and down under the action of the magnets 4, the nuts in the vertical state can be pushed down or limited to advance by the aid of the leveling baffle plates 31, the stacked nuts can be leveled or attached to the upper end faces of the leveling baffle plates 31 to be far away from the conveying groove 3 until falling, the nuts losing magnetic force adsorption or being too small in adsorption force can fall along the slope, and the stacking phenomenon cannot be caused.

As shown in fig. 3, a limiting mechanism 5 and a cleaning mechanism 6 are arranged on the frame 1 above the conveying trough 3 at the blanking end s, the limiting mechanism 5 includes a downward pressing cylinder 51, a lower pressing plate 52 fixed at the end of the piston rod of the pressing cylinder 51, and a lower pressing piece 53 fixed at the bottom of the lower pressing plate 52; the cleaning mechanism 6 includes a cleaning nozzle 61 connected to an air compressor, and the cleaning nozzle 61 is aligned with a position on the conveying chute 3 corresponding to the lower pressing member 53.

As shown in fig. 2 and 3, the lower pressing members 53 are vertically arranged downwards, and the number and the positions of the lower pressing members 53 correspond to the magnets 4 on the same link plate, and the diameter of the lower pressing members 53 is smaller than the diameter of the central hole on the nut. When the nut moves to the feeding end s, the lower pressing cylinder 51 is used for driving the lower pressing plate 52 to move downwards, and the lower pressing piece 53 can be driven to penetrate through a central hole in the nut downwards, so that the nut is limited; meanwhile, compressed air is sprayed towards the nut by using the cleaning nozzle 61 to clean metal chips and lubricating oil on the surface of the nut; and the conveyer belt continues to operate at this moment, makes magnet 4 and nut alternate segregation to make the metal fillings that adsorb on the nut surface lose the adsorption affinity, improve the clearance effect of clean nozzle 61.

The nut can rotate relative to the lower pressing piece 53, and the surface of the nut is in a regular hexagon shape, so that when the cleaning nozzle 61 sprays air to the nut, the nut can rotate rapidly under the impact of compressed air, the nut is cleaned in all directions by utilizing the compressed air and centrifugal force, and oil stains and metal chips are removed; and the cold heading processing sometimes can lead to the nut fracture to produce the breach, then when this type of substandard product nut rotated under the impact of clean nozzle 61, push down 53 can pass in the breach for substandard product nut loses spacing and is blown away, thereby reaches certain screening effect.

As shown in fig. 4, the cleaning mechanism 6 further includes a waste chute 62 opened toward the lower press piece 53, and the waste chute 62 is disposed on both sides of the lower press piece 53 opposite to the cleaning nozzle 61. When the cleaning nozzle 61 is used for cleaning, the cleaned oil and scrap iron, other nuts adsorbed on the nuts, or defective nuts with gaps can enter the waste trough 62 for recycling. Set up coarse filtration net 621 in dirty tank 62 and carry out layering from top to bottom, can filter down most lubricating oil and metal fillings, let complete nut and substandard product nut stay the upper strata, be convenient for categorised the utilization.

As shown in fig. 4, the waste chute 62 is fixedly connected to the lower press plate 52, so that the waste chute 62 and the lower press member 53 are lifted and lowered synchronously; and the opening of the waste chute 62 is provided with a contact piece 622 extending obliquely downwards and outwards along the bottom edge, and the contact piece 622 is made of an elastic material. Utilize contact piece 622 to contact with conveyer trough 3 downwards, contact piece 622 extrudees conveyer trough 3 and takes place deformation when holding down plate 52 falls to the minimum, avoids appearing the space between waste material groove 62 and the conveyer trough 3, and rises when clean back waste material groove 62 that finishes, avoids causing the hindrance to subsequent nut.

As shown in fig. 2 and 5, the lower pressing member 53 is in the shape of a needle with a conical end, and a limiting groove 32 that is engaged with the end of the lower pressing member 53 is provided on the conveying groove 3 below the lower pressing member 53. The conical end of the lower member 53 has a guiding function, so that the lower member 53 can be smoothly inserted into the center hole against the conical surface even if the nut has a certain positional deviation with respect to the magnet 4; the end of the lower pressing member 53 can be limited by the limiting groove 32, so that the structural stability of the lower pressing member 53 is enhanced, and the lower pressing member 53 is prevented from being bent or broken due to rapid rotation of the nut.

As shown in fig. 2 and 5, the magnet 4 is annular, and the inner diameter of the magnet 4 is greater than the inner diameter of the nut, so that the metal chips in the central hole of the nut can only be adsorbed on the hole wall and can not be adsorbed on the conveying groove 3 in the middle position of the central hole, and the metal chips are prevented from being accumulated in the limiting groove 32 when the nut moves to the position of the limiting groove 32, so that the end of the pressing piece 53 can not be embedded into the limiting groove 32, and even the end of the pressing piece 53 is damaged.

As shown in fig. 3 and 4, a discharge nozzle 11 connected to an air compressor is mounted on the frame 1 above the conveying chute 3 at the discharging end s, and the discharge nozzle 11 is fixed to a side of the lower pressing member 53 away from the discharging end s and aligned with a position of the conveying chute 3 corresponding to the lower pressing member 53. When the nut finishes cleaning, the lower pressing piece 53 rises, compressed air is sprayed out of the cleaned nut by the discharge nozzle 11, the nut is discharged from the discharging end s of the conveying groove 3, and oil stain and scrap iron are prevented from being stained again due to the fact that the cleaned nut is in contact with uncleaned nuts.

As shown in fig. 2, two (or one or more) link plates without magnets 4 are spaced between two adjacent link plates with magnets 4, so that the operation of the link plate conveyor belt 2 does not need to be stopped when cleaning nuts, and cleaning and discharging can be performed by using the conveying interval.

In summary, in the feeding device for the cold heading machine in this embodiment, if the nuts are conveyed and other fasteners such as bolts are conveyed and cleaned, the pressing member 53 needs to be replaced by a pressing member having a large bottom area, and the conveying effect is not affected.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The utility model provides a material feeding unit for cold heading machine, includes frame (1) and sets up the conveying mechanism on frame (1), its characterized in that: the conveying mechanism comprises a conveying belt and a conveying groove (3); a plurality of magnets (4) are arranged on the conveyor belt at intervals; the conveying groove (3) is arranged above the conveying belt, and the bottom of the conveying groove (3) is attached to the magnet (4) on the conveying belt; one end of the conveyor belt is a blanking end(s), and a limiting mechanism (5) and a cleaning mechanism (6) are arranged above the conveying groove (3) on the rack (1) at the blanking end(s); the limiting mechanism (5) comprises a pressing cylinder (51), a pressing plate (52) arranged at the end part of a piston rod of the pressing cylinder (51) and a pressing piece (53) arranged at the bottom of the pressing plate (52), and the position of the pressing piece (53) corresponds to the position of the magnet (4); the cleaning mechanism (6) comprises a cleaning nozzle (61) connected with an air compressor, and the cleaning nozzle (61) is aligned to a position, corresponding to the lower pressing piece (53), on the conveying groove (3); the conveying path of the conveying belt is in a slide shape which is horizontal, then extends upwards in an inclined way and then extends horizontally, and the blanking end(s) is positioned at the horizontal section at the topmost end; a leveling baffle (31) is arranged on the inclined section of the conveying groove (3), and the distance between the leveling baffle (31) and the conveying groove (3) is larger than the thickness of the fastener when the fastener is horizontally placed and smaller than the height of the fastener when the fastener is erected; the pressing piece (53) is in a needle shape with a conical end, and the diameter of the pressing piece (53) is smaller than the aperture of the central hole in the nut.

2. The feeding device for a cold header as set forth in claim 1, wherein: and a limiting groove (32) matched with the end part of the lower pressing piece (53) is arranged below the lower pressing piece (53) on the conveying groove (3).

3. The feeding device for a cold header as set forth in claim 2, wherein: the magnet (4) is annular, and the inner diameter of the magnet (4) is larger than that of the nut.

4. The feeding device for a cold header as set forth in claim 1, wherein: the discharging device is characterized in that a discharging nozzle (11) connected with an air compressor is arranged above a conveying groove (3) at the discharging end(s) on the rack (1), the discharging nozzle (11) is arranged on one side, away from the discharging end(s), of a lower pressing piece (53), and is aligned to the position, corresponding to the lower pressing piece (53), on the conveying groove (3).

5. The feeding device for a cold header as set forth in claim 1, wherein: the cleaning mechanism (6) further comprises a waste trough (62) with an opening facing the lower pressing piece (53), and the waste trough (62) and the cleaning nozzle (61) are arranged on two sides of the lower pressing piece (53) relatively.

6. The feeding device for a cold heading machine according to claim 5, wherein: the waste material groove (62) is fixedly connected with the lower pressing plate (52).

7. The feeding device for a cold header as set forth in claim 6, wherein: a contact piece (622) extending downwards and outwards in an inclined mode is arranged at the opening of the waste trough (62) along the bottom edge; the contact piece (622) is made of an elastic material.

8. The feeding device for a cold header as set forth in claim 1, wherein: the conveying belt is a chain plate conveying belt (2) driven by a motor-driven chain wheel to drive a chain plate to move, a plurality of magnets (4) on the chain plate are arranged side by side, and a plurality of lower pressing pieces (53) are arranged corresponding to the cleaning nozzles (61); the chain plates provided with the magnets (4) are separated from each other by one or more chain plates without the magnets (4).