CN212531236U

CN212531236U - Reinforcing bar blanking equipment and blanking system

Info

Publication number: CN212531236U
Application number: CN202020689753.9U
Authority: CN
Inventors: 陈振东; 其他发明人请求不公开姓名
Original assignee: TJK Machinery Tianjin Co Ltd
Current assignee: TJK Machinery Tianjin Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2021-02-12
Anticipated expiration: 2030-04-29

Abstract

The utility model belongs to the technical field of mesh welding, and discloses a steel bar blanking device and a blanking system, wherein the steel bar blanking device comprises a blanking support; the storage bin is arranged on the blanking bracket and used for placing the perforated steel bars; the blanking device is arranged on the blanking support and is provided with a blanking channel and an alignment assembly, the blanking channel is positioned below the discharge port of the storage bin, the width of the blanking channel is adjustable so that the perforated reinforcing steel bars with different diameters can pass through the blanking channel, and the alignment assembly is used for aligning the end parts of the two ends of the perforated reinforcing steel bars; the material shifting device is arranged on the blanking support and is configured to shift the open-hole reinforcing steel bars in the blanking channel out of the blanking channel one by one. The utility model discloses a reinforcing bar blanking equipment, it can be according to the trompil size of net piece, the reinforcing bar of the different length of blanking and diameter, and then satisfy the welding demand to the net piece of trompil. The utility model discloses an above-mentioned blanking system can realize the welding to the net piece that different trompils required, has improved production efficiency.

Description

Reinforcing bar blanking equipment and blanking system

Technical Field

The utility model relates to a net piece welding technology field especially relates to a reinforcing bar blanking equipment and blanking system.

Background

At present, in the existing reinforcing mesh welding production line, a reinforcing bar blanking mechanism is positioned behind a main machine, transverse bars with the same length and the same specification and diameter are stored and straightened in advance, and the transverse bars are conveyed to the lower part of an electrode for welding through material suction by a feeding device and material distribution by material stirring. Above-mentioned prior art reinforcing bar net welding production line's blanking mechanism has following defect:

each set of reinforcing mesh welding production line equipment is only provided with one set and is a blanking mechanism of a form, the structure can only be used for welding standard type meshes with the transverse ribs of the same length and the same specification diameter, if the meshes in the form of holes are arranged in local positions, the blanking mechanism can not be directly met, the mesh with the holes can only be formed by manually shearing the meshes and removing redundant transverse ribs through the manual shearing meshes after the standard type meshes are welded, the time and the labor are wasted, the production efficiency is low, and the welding requirement on the meshes with the holes can not be met.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a reinforcing bar blanking equipment and blanking system can realize the blanking of degree standard length's reinforcing bar, also can realize opening the blanking of hole reinforcing bar, can satisfy the welding demand to the net piece of trompil.

To achieve the purpose, the utility model adopts the following technical proposal:

a rebar blanking device, comprising:

a blanking bracket;

the storage bin is arranged on the blanking bracket and used for placing the perforated steel bars;

the blanking device is arranged on the blanking support and provided with a blanking channel and an alignment assembly, the blanking channel is positioned below a discharge port of the storage bin, the width of the blanking channel is adjustable, so that the perforated steel bars with different diameters can pass through the blanking channel, and the alignment assembly is used for aligning the end parts of two ends of the perforated steel bars;

and the material shifting device is arranged on the blanking support and is configured to shift the perforated steel bars in the blanking channel out of the blanking channel one by one.

Preferably, the blanking device comprises a fixed rail mounted on the blanking support, and a movable rail which is arranged at an interval with the fixed rail and can move relative to the fixed rail, and the interval between the movable rail and the fixed rail forms the blanking channel.

Preferably, a plurality of fixed sliding strips are arranged on the fixed rail at intervals, a plurality of movable sliding strips are arranged on the movable rail at intervals, each fixed sliding strip is opposite to one movable sliding strip, and the blanking channel is formed between each fixed sliding strip and each movable sliding strip.

Preferably, the bottom of the fixed slide bar is connected with a spring plate.

Preferably, the alignment assembly comprises a fixed alignment plate fixed on the movable rail and a movable alignment plate slidably disposed on the movable rail, and the movable alignment plate can be close to or far from the fixed alignment plate and is matched with the fixed alignment plate to align the ends of the plurality of open-hole steel bars.

Preferably, the steel bar feeding device further comprises a material twisting device, wherein the material twisting device comprises two rotatable material twisting rollers arranged below the discharge port of the storage bin, the two material twisting rollers can move synchronously relative to the discharge port of the storage bin, a gap which can only be used for allowing one steel bar to pass through is formed between the material twisting rollers, and the gap is right opposite to the blanking channel.

Preferably, the material shifting device comprises a driving assembly fixed on the blanking support, a rotating shaft which is rotatably arranged on the blanking support in a penetrating mode and driven to rotate by the driving assembly, a clamping knife fixed on the rotating shaft, and a guide plate matched with the clamping knife, wherein the clamping knife is configured to shift the perforated steel bars in the blanking channel to the guide plate one by one, and the guide plate is used for guiding the perforated steel bars on the guide plate.

Preferably, the driving assembly comprises an air cylinder fixed on the blanking support, a first chain wheel rotatably arranged on the blanking support, a second chain wheel fixed at one end of the rotating shaft, and a chain driven by the first chain wheel and the second chain wheel, and the output end of the air cylinder is fixedly connected to the chain.

The utility model also provides a blanking system, including host computer mechanism, first blanking mechanism and at least a set of above-mentioned reinforcing bar blanking equipment of aforesaid, reinforcing bar blanking equipment slide arrange in host computer mechanism and lie in host computer mechanism with between the first blanking mechanism, be used for carrying the trompil reinforcing bar at the welding electrode of host computer mechanism; the first blanking mechanism is located on one side of the steel bar blanking equipment and used for conveying non-perforated steel bars to the welding electrode of the host mechanism.

Preferably, the first blanking mechanism is provided with a first material shifting device, and the first material shifting device is configured to shift the non-perforated steel bars one by one to a guide plate of the material shifting device.

The utility model has the advantages that:

the utility model discloses a reinforcing bar blanking equipment, its doffer's blanking channel width is adjustable to and the setting of alignment subassembly, can be according to the trompil size of net piece, the reinforcing bar of the different length of blanking and diameter, and then satisfy the welding demand to the net piece of trompil.

The utility model discloses an above-mentioned blanking system, through setting up reinforcing bar blanking equipment and first blanking mechanism, it can realize the welding to the net piece that different trompils required, has improved production efficiency. And reinforcing bar blanking equipment can set up a set ofly or multiunit as required, and it can be suitable for the blanking of the horizontal muscle of trompil of different trompil positions, satisfies the demand of customer to the net piece of the trompil of producing various shape specifications.

Drawings

Fig. 1 is a front view of a steel bar blanking device provided by the present invention;

fig. 2 is a cross-sectional view a-a of fig. 1 in accordance with the present invention;

fig. 3 is a schematic structural view of the reinforcing steel bar blanking device provided by the present invention cooperating with the first blanking mechanism;

fig. 4 is a schematic structural diagram of meshes with different shapes and specifications provided by the present invention.

In the figure:

1. a blanking bracket; 2. a storage bin; 31. a blanking channel; 32. a fixed rail; 33. a movable rail; 34. fixing a slide bar; 35. a movable slide bar; 36. a spring plate; 37. fixing the alignment plate; 38. a movable alignment plate; 41. a rotating shaft; 42. clamping a cutter; 43. a guide plate; 44. a cylinder; 45. a first sprocket; 46. a second sprocket; 47. a chain; 48. a tension sprocket; 49. a bearing seat; 51. a material rolling roller; 10. a host mechanism; 20. first blanking mechanism.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The utility model provides a reinforcing bar blanking equipment, it can realize the blanking of trompil reinforcing bar, and can the different length of blanking and the reinforcing bar of diameter size as required to satisfy the welding demand to the net piece of trompil. In the utility model discloses in, on the net piece of above-mentioned trompil reinforcing bar specifically indicates the trompil, several reinforcing bars that form the hole. The open-hole reinforcing steel bar can be a transverse bar or a longitudinal bar. Of course, if the net piece of processing does not need the trompil, the utility model discloses a non-trompil reinforcing bar of reinforcing bar blanking equipment also can the blanking, it still can be as required the different length of blanking and the reinforcing bar of diameter size.

As shown in fig. 1-3, the steel bar blanking apparatus of the present embodiment includes a blanking support 1, a bin 2, a blanking device, and a material shifting device, where the bin 2, the blanking device, and the material shifting device are all mounted on the blanking support 1.

Above-mentioned feed bin 2 is used for the storage to treat the trompil reinforcing bar of blanking, and it is big-end-up's hourglass hopper-shaped structure, and its discharge gate sets up in the bottom to the trompil reinforcing bar can fall down from the discharge gate through self gravity. It will be appreciated that a baffle arrangement may also be provided at the discharge opening to close the silo 2 when blanking is not required. It should be noted that a plurality of steel bars with holes can be placed in the bin 2.

The blanking device is arranged on the blanking support 1 and is used for the perforated steel bars in the feeding bin 2 to pass through. Specifically, as shown in fig. 1 and 2, the blanking device includes a fixed rail 32, a movable rail 33, and an alignment assembly, wherein the fixed rail 32 is fixedly mounted on the blanking bracket 1, and may be formed by two rails as shown in fig. 2, and a plurality of fixed sliding strips 34 are arranged on the fixed rail 32 at intervals. The movable rail 33 is movably mounted on the blanking bracket 1, and is opposite to the fixed rail 32 and can be close to or far from the fixed rail 32, and the fixed rail 32 and the movable rail 33 are arranged at intervals. A plurality of movable sliding bars 35 are arranged on the movable rail 33 at intervals, each movable sliding bar 35 is opposite to one fixed sliding bar 34 and is provided with an interval, and the blanking channel 31 can be formed through the intervals between the plurality of fixed sliding bars 34 and the plurality of movable sliding bars 35. This blanking passageway 31 is located the below of the discharge gate of above-mentioned feed bin 2, and trompil reinforcing bar accessible discharge gate in the feed bin 2 falls into above-mentioned blanking passageway 31 to can be through fixed draw runner 34 and the direction of activity draw runner 35, finally fall to the bottom of blanking passageway 31.

The bottom of the fixed sliding bar 34 is connected with a spring plate 36, and the spring plate 36 is used for blocking the punched steel bars which are discharged out, so that the punched steel bars are prevented from being separated from the required discharging position.

Preferably, the distance between the movable slide bar 35 and the fixed slide bar 34 is greater than the diameter of the rebar to ensure that the rebar can smoothly pass through the formed blanking channel 31. In this embodiment, two adjacent fixed slides 34 and two adjacent movable slides 35 may be disposed in an opposite manner, or two adjacent fixed slides 34 and two adjacent movable slides 35 may be disposed in a staggered manner.

In this embodiment, the movable rail 33 can move relative to the fixed rail 32 through a screw rod structure, or the movable rail 33 can be driven to move relative to the fixed rail 32 through driving members such as an air cylinder, and the moving principles thereof are prior art and are not described in detail. Through the removal of movable rail 33 for fixed rail 32, can make the width of the blanking passageway 31 that forms adjustable, that is to say, when the diameter of trompil reinforcing bar is different, adjust the width of blanking passageway 31 through the removal of movable rail 33, and then adapt to the trompil reinforcing bar of different diameters.

Above-mentioned align the subassembly and install on movable rail 33, it can realize the alignment to many trompil reinforcing bar tip, and then guarantees that the position of the trompil reinforcing bar that the blanking goes out is accurate, improves the finished product yield of the net piece of processing. As shown in fig. 1, the alignment assembly includes a fixed alignment plate 37 fixed to the movable rail 33, and a movable alignment plate 38 slidably disposed on the movable rail 33, wherein the movable alignment plate 38 can be moved toward or away from the fixed alignment plate 37 and cooperate with the fixed alignment plate 37 to align the ends of the plurality of open-hole reinforcing bars. It can be understood that the fixed aligning plate 37 and the movable aligning plate 38 may include a fixed plate fixed on the movable rail 33, and a striker plate perpendicular to the fixed plate and extending into the blanking channel 31, and the two ends of the open-hole steel bar can be aligned through the striker plate of the fixed aligning plate 37 and the striker plate of the movable aligning plate 38.

The movable alignment plate 38 can be driven by a cylinder or other driving member to slide relative to the movable rail 33, and the alignment of the perforated steel bars with different lengths can be adapted by the sliding of the movable alignment plate 38.

In this embodiment, further, a material twisting device is further arranged between the bin 2 and the blanking device, and the material twisting device can help to blank the perforated steel bars in the bin 2. Because many trompil reinforcing bars have been placed in the feed bin 2, many trompil reinforcing bars pile up, can lead to the trompil reinforcing bar can't get into blanking passageway 31. On the basis, the material twisting device is provided in the embodiment, and the material twisting device includes two material twisting rollers 51 which are arranged below the discharge port and can rotate, the two material twisting rollers 51 can move synchronously relative to the discharge port of the storage bin 2, a gap through which only one open-hole reinforcing steel bar can pass is formed between the two material twisting rollers 51, and the gap can be opposite to the blanking channel 31. Through the clearance that two material rollers 51 formed of rubbing together, the synchronous motion of material roller 51 is rubbed to two cooperations, it can realize the supplementary blanking to the trompil reinforcing bar in the feed bin 2, promptly when needs the trompil reinforcing bar to fall into blanking passageway 31, through two material rollers 51 of rubbing together of reciprocating motion, rub material roller 51 can contact with the trompil reinforcing bar, and drive its removal or rotation that takes place little displacement, and then finally fall into in two gaps of rubbing together material roller 51, and when two gaps of rubbing together material roller 51 were arranged in blanking passageway 31 top, the trompil reinforcing bar falls into blanking passageway 31.

As shown in fig. 1-3, the material shifting device is mounted on the blanking bracket 1, and can shift the steel bars with holes in the blanking channel 31 out of the blanking channel 31 one by one. Illustratively, the material poking device comprises a driving assembly, a rotating shaft 41, a clamping knife 42 and a guide plate 43, wherein the driving assembly is fixed on the blanking support 1 and is used for driving the rotating shaft 41 to rotate. The rotating shaft 41 is rotatably disposed through the blanking bracket 1 via a bearing seat 49 and can be driven by the driving assembly to rotate. The clamping knife 42 is fixed on the rotating shaft 41 and can be driven by the rotating shaft 41 to rotate, so as to shift the open-hole steel bars in the blanking channel 31 to the guide plate 43 one by one. Preferably, the plurality of the clamping blades 42 can be provided, and each clamping blade 42 is arranged on one side of one fixed slide bar 34. The guide plate 43 is fixed to the movable slide bar 35, and can guide the open-hole reinforcing bar that the clamping knife 42 is moved to, so that the open-hole reinforcing bar is finally dropped to a predetermined position (i.e., at the welding electrode).

In this embodiment, preferably, the driving assembly includes an air cylinder 44 fixed on the blanking bracket 1, a first sprocket 45 rotatably disposed on the blanking bracket 1, a second sprocket 46 fixed at one end of the rotating shaft 41, and a chain 47 driving the first sprocket 45 and the second sprocket 46, and an output end of the air cylinder 44 is fixedly connected to the chain 47. Through the drive assembly of this structure, it can transmit enough big power for the bayonet 42 stirs the trompil reinforcing bar, and the drive assembly of this structure, its power transmission is steady, is favorable to stirring spaced control to the trompil reinforcing bar, and then has improved net piece welded efficiency and yield. In this embodiment, the driving assembly further comprises a tension sprocket 48, wherein the tension sprocket 48 is chain-driven with the chain 47, and can tension the chain 47 to improve the stability of power transmission.

When the steel bar blanking device of the embodiment performs the blanking of the steel bar with the hole, the width of the blanking channel 31 can be adjusted according to the length and the diameter of the steel bar with the hole. Then the feed bin 2 begins to discharge, the perforated steel bars in the feed bin 2 are placed in the gaps through the material twisting device and finally enter the blanking channel 31, and then the perforated steel bars fall to the bottom of the blanking channel 31 under the guiding action of the blanking channel 31. And aligning the open-hole steel bars through the aligning assembly, shifting the open-hole steel bars to the guide plate 43 one by one through the material shifting device, and finally blanking the open-hole steel bars to the welding electrode. It can be understood that, the steel bar blanking device of the present embodiment may also perform blanking of steel bars of non-perforated mesh.

The utility model provides a blanking system, as shown in fig. 3, this blanking system includes host computer mechanism 10, first blanking mechanism 20 and at least a set of foretell reinforcing bar blanking equipment, and wherein reinforcing bar blanking equipment slides and arranges in host computer mechanism 10 and lies in between host computer mechanism 10 and the first blanking mechanism 20, and it can realize the slip for host computer mechanism 10 through the structure of slider and slide rail to sliding to predetermineeing the position after, fixing in this position department of host computer mechanism 10. Through the reinforcing bar blanking equipment that slides and set up, it can be suitable for the processing of the net piece of different trompil positions, and the net piece trompil position is different promptly, and then the blanking position of trompil reinforcing bar is also different, and the blanking position of trompil reinforcing bar can be confirmed through the removal of reinforcing bar blanking equipment this moment. In this embodiment, it should be noted that when the perforated steel bar is dropped, the perforated steel bar finally drops to the welding electrode of the main body mechanism 10 through the guide plate 43.

The blanking system of this embodiment can select to set up multiunit reinforcing bar blanking equipment according to the needs of the structure of the welded net piece (if open the net piece structure of a plurality of holes, or the net piece structure that does not open the hole but the trompil reinforcing bar diameter is different), and multiunit reinforcing bar blanking equipment moves to host computer mechanism 10 certain position department according to the position of trompil wanting to carry out the blanking of the trompil reinforcing bar of required length.

The first blanking mechanism 20 is located at one side of the steel bar blanking device, and is used for conveying non-perforated steel bars to the welding electrode of the host mechanism 10. In this embodiment, the first blanking mechanism 20 is provided with a first material shifting device, and the first material shifting device can shift the non-perforated steel bars one by one to the guide plate 43 of the material shifting device of the steel bar blanking device. That is, the open-hole steel bars blanked by the steel bar blanking device and the non-open-hole steel bars of the first blanking mechanism 20 are guided to the welding electrode by the same guide plate 43. In this embodiment, the first blanking mechanism 20 is a structure in the prior art, and it only needs to be able to realize blanking of non-perforated steel bars. It should be noted that, in the blanking system of the present embodiment, the steel bar blanking device and the first blanking mechanism 20 only operate one at a time.

The utility model discloses an above-mentioned blanking system, through setting up reinforcing bar blanking equipment and first blanking mechanism 20, it can realize the welding (the net piece of several kinds of structures shown in fig. 4) of the net piece that requires to different trompils, has improved production efficiency. And reinforcing bar blanking equipment can set up a set ofly or multiunit as required, and it can be suitable for the blanking of the horizontal muscle of trompil of different trompil positions, satisfies the demand of customer to the net piece of the trompil of producing various shape specifications.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a reinforcing bar blanking equipment which characterized in that includes:

a blanking bracket (1);

the storage bin (2) is arranged on the blanking bracket (1) and used for placing the perforated steel bars;

the blanking device is arranged on the blanking support (1), the blanking device is provided with a blanking channel (31) and an alignment assembly, the blanking channel (31) is positioned below a discharge hole of the storage bin (2), the width of the blanking channel (31) is adjustable, so that the perforated steel bars with different diameters can pass through, and the alignment assembly is used for aligning the end parts of two ends of the perforated steel bars;

the material shifting device is arranged on the blanking support (1) and is configured to shift the perforated steel bars in the blanking channel (31) out of the blanking channel (31) one by one.

2. The steel bar blanking device according to claim 1, characterized in that the blanking device comprises a fixed rail (32) mounted on the blanking bracket (1), and a movable rail (33) arranged at a distance from the fixed rail (32) and movable relative to the fixed rail (32), wherein the distance between the movable rail (33) and the fixed rail (32) forms the blanking channel (31).

3. The steel bar blanking device according to claim 2, wherein a plurality of fixed sliding bars (34) are arranged on the fixed rail (32) at intervals, a plurality of movable sliding bars (35) are arranged on the movable rail (33) at intervals, each fixed sliding bar (34) is arranged opposite to one movable sliding bar (35), and the blanking channel (31) is formed between the fixed sliding bar (34) and the movable sliding bar (35).

4. The steel bar blanking device according to the claim 3, characterized in that the bottom of the fixed slide bar (34) is connected with a spring plate (36).

5. The steel bar blanking device according to claim 2, wherein the alignment assembly comprises a fixed alignment plate (37) fixed on the movable rail (33), and a movable alignment plate (38) slidably disposed on the movable rail (33), wherein the movable alignment plate (38) can move close to or away from the fixed alignment plate (37) and cooperate with the fixed alignment plate (37) to align the ends of the plurality of steel bars.

6. The steel bar blanking device according to any one of claims 1 to 5, further comprising a material twisting device, wherein the material twisting device comprises two rotatable material twisting rollers (51) disposed below the discharge port of the storage bin (2), the two material twisting rollers (51) can move synchronously relative to the discharge port of the storage bin (2), a gap through which only one steel bar with a hole can pass is formed between the two material twisting rollers (51), and the gap is opposite to the blanking channel (31).

7. The steel bar blanking device according to claim 1, wherein the material shifting device comprises a driving assembly fixed on the blanking support (1), a rotating shaft (41) rotatably disposed on the blanking support (1) and driven by the driving assembly to rotate, a clamping knife (42) fixed on the rotating shaft (41), and a guide plate (43) matched with the clamping knife (42), the clamping knife (42) is configured to shift the steel bars with holes in the blanking channel (31) onto the guide plate (43) one by one, and the guide plate (43) is used for guiding the steel bars with holes thereon.

8. The steel bar blanking device according to claim 7, wherein the driving assembly comprises a cylinder (44) fixed on the blanking bracket (1), a first chain wheel (45) rotatably arranged on the blanking bracket (1), a second chain wheel (46) fixed at one end of the rotating shaft (41), and a chain (47) driven by the first chain wheel (45) and the second chain wheel (46), and the output end of the cylinder (44) is fixedly connected to the chain (47).

9. A blanking system, comprising a main machine mechanism (10), a first blanking mechanism (20), and at least one set of steel bar blanking devices according to any one of claims 1 to 8, slidably disposed on the main machine mechanism (10) between the main machine mechanism (10) and the first blanking mechanism (20), for delivering the steel bar with holes at the welding electrode of the main machine mechanism (10); the first blanking mechanism (20) is located on one side of the steel bar blanking equipment and used for conveying non-perforated steel bars to the welding electrode of the main machine mechanism (10).

10. The blanking system according to claim 9, wherein the first blanking mechanism (20) is provided with a first kick-off device configured to kick-off the non-perforated bars one by one onto a guide plate (43) of the kick-off device.