GR1009735B - Rebar decolling system with variable unwinding speed - Google Patents

Abstract

The invention relates to system meant to decoil a rebar coil (2) positioned perpendicular to the spinning wheel (4); pairs of guides- rollers (21) set above said spinning wheel, on the framework (15) of the rollers-guides, are freely rotating about an axis coinciding with the spinning wheel’s and coil’s axis (10) to vertically conduct the rebar (2) from the outer spire of the coil (1), in the coil’s axis 10 . For further processing, the rebar (2) is driven through the guides (31), (33), (35) and pulled by the rollers (40).

Description

BEETLE ROLL ROLLING SYSTEM FOR

VARIABLE UNVELLING SPEED

DESCRIPTION

The present invention refers to a system for unwrapping betto verga wrapped in a roll. The coil is placed vertically in a basket which rests on bearings so that it rotates around its axis.

The beet rod is received from the coil and by means of guide rollers it is guided in a vertical direction to the axial direction of the coil and from there by means of guides to the processing mechanisms. The guide rollers of the betoverga are based on a shaft and rotate freely around a vertical axis passing through the center of the coil.

The shape of the beam curve specified by the roller guides is chosen to cause minimal deformations and internal stresses in the beam.

Unwinding the betoverga from the coil is done by pulling the betoverga with a roller out of the wind.

Technical level cons

Beetroot is available in various diameters, wrapped in mass coils usually up to 1500 to 2000 kg and sometimes up to 5000 kg. The coils are the raw material for bettobar processing machines, such as: straighteners which produce straight bars of various diameters and lengths, bending machines to produce beams of various sizes and mesh welding machines, which produce building mesh.

In most cases the unwinding speed must be continuously variable and it takes enormous power and consequent power consumption to rotate the wind according to demand.

Because it is almost impossible to coordinate the unwinding speed with the demand of the machine, complex systems are used to store the material between the wind and the machine, smaller coils are used that are easier to control, special windings are made on the coils, etc.

Unrolling of coils is usually done in vertical winds. The coil is placed on a winder, which rotates around its vertical axis, and the rod is pulled by a roller mechanism in a horizontal direction. The coil and the wind on which it rests rotate as the coil is unwound at variable speeds, which depend on the coil demand and the unwinding diameter of the coil. In case of rotation starts and stops, high values of acceleration and deceleration torques are required due to the moment of inertia of the winding and the coil. Acceleration of the coil and wind is usually accomplished by pulling the rod by the drive roller mechanism, and the pulled rod pushes against the coils on which it is wound. If the windings of the bobbin are not wound in sequence and tightly, the drawn winding enters between the windings of the bobbin and jamming occurs during unwinding. As the rotation slows the coils on the coil loosen and pile up on the wind. With the next acceleration some coil is wedged between the coil and the base of the wind resulting in jamming of the unwinding. In the existing state of the art, a satisfactory coil winding at high and variable speed requires a coil wound in series, with tight spirals and in a conical shape, with a smaller diameter at the top so that the coils that are loose during unwinding do not fall out. In addition, mechanical equipment suitable for accelerations and decelerations of the rotational movement of the wind and the coil is required. Due to the masses and dimensions of the coils the moment of inertia with respect to the vertical axis is high and accordingly a strong mechanical installation is required and high energy consumption results. The difficulty of controlling rapid acceleration and deceleration limits both the dimensions and the mass of the coils to be unrolled. However, the mass affects the productivity of the beetroot processing machines because the loading of a new coil results in a dead time of loading and unloading the coil. Although larger coils with greater mass increase productivity and facilitate machine operation, they cannot be utilized with the current state of the art.

For small diameters of mainly smooth wire and secondarily for fine wire rods, the coil is placed on a still wind and unwound is vertical to the coil axis leading the material around a cone to an exit die. The material is then guided through guides and rollers and pulled by rollers out of the wind. The material is twisted as it is pulled from the coil, namely one turn per length as long as the circumference of the coil from which it came. It is used for thin smooth wires and rarely for small diameter bettobars.

Another unwinding process is applied to wire drawing machines. The coil is stationary, a guide rotates about the vertical axis of the coil freely and circumferentially about the coil, receives wire from an external coil, then the wire is guided to a guide on the axial coil and through guides for further processing. It is used for thin smooth wires which are flexible and can be guided through rollers and guides. Another unrolling process is shown in patent 3,659,802. It refers to the unwinding of coils of thin wires with the main application in drawing machines. The coil is placed on a winder, which rotates at controlled speeds. A pipe guide of suitable geometry is placed on the wind to guide the wire from the outer coil to the axial to the coil and higher than the coil. The guide tube rotates freely relative to the coil axis. The wire is then guided through guides to the drawing machines. The patent is intended to feed wire pullers without twisting. By adjusting the coil turns relative to the wire unwinding speed, the wire guide tube remains stationary. The patent applies to thin wires suitable for operation in drawing machines to gradually reduce the diameter.

Purpose and scope of the present invention

The purpose of the present invention is to present a system for unwinding a bettobar coil in a vertical direction, capable of providing bettobar at high speed, responding to large fluctuations in bettobar demand, applicable for all bettobar diameters and utilizing coils with large dimensions and masses.

The invention is applicable to all kinds of bettobar processing machines, aligning, bending and mesh welding machines for high bettobar feeding speeds.

The system is shown by way of example in the following figures:

Figure 1 : Illustrates the betto verga unrolling system.

Figure 2: Depicts the guide pulleys of the betoverga.

Figure 3: Illustrates the bearing of the frame of the guide rollers.

Figure 4: Illustrates the orientation of the raoul pair in space with respect to the plane of maximum curvature.

Figure 6: Illustrates the auxiliary power supply during initial feeding of the bettobar.

Figure 7: Illustrates a side view of the auxiliary power supply.

Disclosure of the invention

The coil (1) is placed vertically on the wind plate (3) (4). On the plate (3) of the wind (4) the guide arms (5) are fixed to internally guide the coil (1) during its loading. The plate (3) is mounted on the frame (6) of the wind. The wind plate (3) rotates freely around its axis (10) and can be stopped by the action of the brake (7).

The roller-guides of the betoverga are based on a metal structure (15), the frame of the roller-guides. The frame of the guide rollers (15) is located by means of the shaft (18) and the bearings (16), (17) on the base (19) between the guide arms (5) of the wind, and is secured on it by means of the screws (20). The frame of the guide rollers (15) rotates with respect to its axial axis, which coincides with the axial axis of the wind (10), with its rotational speed limited by an adjustable brake (27).

On the roller guide frame (15) are seated pairs of rollers (21) formed with a groove and placed facing each other in contact. The pairs of rollers (21) lead the batten (2) from the coil (1) to the axial wind (10) at a point higher than the coil.

The positions and orientation of the guide rollers (21) are determined by an optimal configuration of the bettobar (2), which is received by the coil (1) tangentially at a point outside the highest spiral and rendered higher and in the direction of the axial wind and of the coil (10) towards the matrix (30).

The positions of the guide rollers are selected so that the betovaerga (2) presents as little resistance as possible during its passage through them. The orientation of the guide rollers is determined by the plane of the maximum curvature or the minimum radius of curvature of the curve that the axial line of the bettobar crosses. The plane (22) of the pairs of raoults coincides at each position with the plane of maximum curvature.

After the rod enters the die (30) in the direction of the axial wind, the rod is guided to a guide (31) consisting of pairs of rollers (32) and guides (33). The bettobar is then guided through guides (34) and (35) for further processing.

The boom is pulled by the wind by a set of propellers (40), which are driven by a motor (41) and gears.

Unwinding the coil with the winder not rotating is as follows: The winder plate is stationary with the brake (7) engaged. The drive rollers (40) with the action of the motor (41) pull the betovaerga (2). The betovega (2) passes through the guides (31), (34) and (35) and through the pairs of guide rollers (21). As the batten rod (2) is drawn, the roller-guide frame (15) with the rollers (21) rotates with respect to the wind axis (10) and performs a rotation for the batten rod length as contained in the perimeter of the unwinding coil.

The bet rod (2) is picked up by the coil (1) in a position outside and slightly higher than the highest coil so that it stands out from the rest of the coils and is pulled by the feed rollers (40). This process works for both well-wrapped and poorly-wrapped coils as the bettobarga separates during unwrapping and is simultaneously pulled by the feed rollers.

Increases and decreases in bettobar feed correspond to increases and decreases in the angular speed of rotation of the roller guide frame (15) after the rollers (21). The moment of inertia of the frame (15) after the rollers (21) with respect to the axis of the wind (10) is much smaller than the moment of inertia of the coil (1) after the rotated part of the wind (4) with respect to its axis ( 10). Thus, smaller torques are needed for the acceleration and deceleration of the wire feed when unwinding with the system of the patent compared to the acceleration and deceleration torque when feeding the wire by unwinding the coil horizontally in the classical way. So we can unravel winds of great dimensions and great mass.

When the demand of betovaerga from the wind slows down, the rotational movement of the frame of the guide rollers (15) slows down at the same time. The deceleration is achieved in combination with the resistance of the betoverga during its unfolding and with the additional action of a brake (27). The brake (27) is adjustable and acts mainly on thin bettobar diameters.

The start of the coil unwinding is done with the help of a portable power supply (50) as follows:

The portable feeder (50) consists of two feeder rollers (51), (52) with at least one motor, driven by a motor (53). The upper roller (51) of the feeder (50) is moved by the action of a roller (54). The portable power supply (50) has two holes for its seating on the frame of the guide rollers (15). Accordingly, on the frame (15) between the first two pairs of rollers (23), (24) there are two pins (25) so that the power supply is located on the frame.

The rod of the first outer coil is guided by hand into the first two pairs of rollers, (23) and (24). The feeder (50) with the rollers (51) and (52) in the open position is placed on the pins (25) on the frame (15), the rollers (23) and (24) of the feeder (50) close and lock the bettobar (2). The wind vane is free to rotate with the brake (7) off.

With the movement of the motor (53) and the feed rollers (51) and (52) the bettobar (2) is pulled and pushed into the rollers (23), (24) and (21) on the frame (15), while at the same time the wind (4) rotates and offers the requested amount of betto verga (2). The rod (2) is advanced through the rollers (21) of the frame (15), the guides (31), (33) and (35) towards the advance rollers (40). The bettobar is locked inside the advance rollers (40), it is released from the rollers (51) and (52) of the auxiliary power supply (50), the auxiliary power supply (50) is removed from its position, the brake (7) is activated and the platform of the wind is immobilized.

The introduction of the beginning of the coil with the auxiliary feeder (50) successively through the guide rollers (21) is supported by the guides (26) in the form of a half die. As the bettobar is advanced by the feeder (50) and towards the next pair of guide rollers (21), it strikes the guide (26) and is guided to the adjacent pair of rollers (21) without external assistance.

In order to load a new coil, the space above the wind must be freed, which is done either by shifting the guide (31) or by moving the wind a distance sufficient to allow the new coil to be loaded. Then the screws (20) are loosened, the frame of the roller guides (15) is removed, the new coil is loaded, the frame (15) is repositioned and secured with the screws (20). The wind or guide (31) is returned to its position and with the auxiliary mechanism (50) the bettobar is fed.

Advantages

According to the invention:

The bettovarga can have from small to large diameter, because the unrolling process is not affected by the diameter of the wire.

The unwinding speed can be very high, as only the frame of the rolls (15) acquires a high speed and not the wind with the coil. The unwinding speed can fluctuate as the accelerating and decelerating masses have little inertia about their axis. The coil may be of poor winding quality because the bettobar is unwound by always pulling the outer coil out and over the highest outer coil and rotating a roll collector without pulling the bettobar.

It is possible to roll out bettobarga with ribs and its longitudinal reinforcements and not just smooth wire.

C singular about protection

The present invention is in no way limited to the embodiment described and illustrated in the drawings, but can be implemented in many forms and dimensions without leaving the scope of protection of the invention.

In the implementation of the invention, the materials used as well as the dimensions of the individual elements can be in accordance with the requirements of the particular construction.

In each claim, where technical features are mentioned and followed by reference numbers, they are included only to increase the comprehensibility of the claims and in this way the reference numbers do not affect the consideration of the elements, which are identified by example with them.

List of names

1 : Beetroot roll.

2: Betoverga

3. Wind plateau.

4: Wind.

5: Guide arms on the wind plateau.

6: Wind skeleton.

7: Brake.

9: Drive transmission.

10: Axial wind.

15: Skeleton of raulon-guides.

16: Roller-guide frame shaft bearing.

17: Roller-guide frame shaft bearing.

18: Roller-guide frame shaft.

19: Guide roller frame base.

20: Roller-guide frame base locking screw.

21: Raoulo-driver.

22: Level of raouls-guides.

23: 1st pair of rauls.

24: 2nd pair of rauls.

25: Piros.

26: Introduction guide to the raoul pairs (21).

27: Guide roller frame brake.

30: Uterus.

31: Betoverga guide.

32: Pairs of raouls.

33: Local guides.

34: Betoverga guide.

35: Betoverga turning guide.

40: Propulsion roller.

41 :Propulsion roller motor.

50: Portable power supply.

51: Upper feed roller (50).

52: Lower feed roller (50).

53: Engine.

54: Cylinder.

Claims (5)

1. A reel-to-coil unwinding system for variable unwinding speed in which a coil (1) of reel material (2) is placed vertically on a wind (4); characterized by: above the wind there is a series of pairs of roller-guides (21) which are based on a frame of roller-guides (15) and rotate freely around an axis that coincides with the axis of the wind and the coil (10) and guide the betovaerga (2 ) from the outer coil of the coil (1) vertically to the axial coil (10), and then the bettobar (2) is guided through guides (31), (33), (35) for further processing, with the rod (2) being pulled by the rollers (40), the frame of the guide rollers (15) together with the pairs of rollers (21) and the contained part of the rod rotating with respect to the axis (10) and providing beetroot for further processing. 2. System as stated in Claim 1 characterized in that: the form of the curve followed by the bettobar (2) from the outer spiral of the coil (1) to the vertical entrance to the matrix (30), is the one with the least resistance to passage and deformation of the bettobar. 3. System as stated in Claim 1 and 2 characterized in that: the pairs of rollers (21) are placed at points on the optimal curve with their plane (22) oriented to the plane of the minimum radius of curvature or the maximum curvature of the curve followed by the beam. 4. System as stated in Claim 1, characterized in that: the frame of the guide rollers (15) can operate in braking during the unwinding with the intensity of the braking depending on the diameter of the unfolded bettobarga. 5. System as stated in Claim 1 characterized in that: the feeding of the betoverga (2) is initially done automatically with a portable auxiliary power supply (50), which is fitted on the frame of the guide rollers (15), encloses the betoverga and advances it through the pairs of guide rollers (21) with the help of the guides (26) without any other external intervention, with the coil (1) and the wind plate (3) rotating freely during the feeding of the bettobarga.