CN116984413A - Metal plate uncoiling device - Google Patents

Abstract

The application relates to the field of metal plate processing, in particular to a metal plate uncoiling device, which comprises a support, a base and a rotating shaft, wherein the support is fixedly connected with the base, the rotating shaft is rotationally connected with the support, the rotating shaft is horizontally arranged, the metal plate uncoiling device further comprises an upper guide roller, a lower guide roller and a movable counterweight roller, the upper guide roller and the lower guide roller are respectively arranged in parallel with the rotating shaft and are respectively rotationally connected with the support, the movable counterweight roller is arranged in parallel with the rotating shaft and is positioned below the rotating shaft, and the lower surface of the movable counterweight roller is arranged on the upper surface of the middle part of an uncoiled part of a metal plate coil. The movable counterweight roller freely rolls and releases the middle part of the uncoiled part of the metal plate coil on the upper surface of the middle part of the uncoiled part of the metal plate coil, and the part of the metal plate coil to be uncoiled is rotated to be uncoiled by the gravity of the movable counterweight roller, so that the maximum traction force required by uncoiling is reduced, the actual output power of a traction device is reduced, the energy-saving effect is achieved, and the stability of uncoiling work is improved.

Description

Metal plate uncoiling device

Technical Field

The application relates to the field of metal plate processing, in particular to a metal plate uncoiling device.

Background

The metal sheet is usually transported and stored in the form of a coil, which is unwound during processing and then transported to other processing equipment for processing.

In the prior art, an uncoiler is generally used for uncoiling coiled metal plates, the uncoiler generally comprises a bracket, a base and a rotating shaft, the coiled metal plates are sleeved on the rotating shaft, one uncoiled end extends to other processing equipment, the coiled metal plates are driven to rotate by traction of traction devices of the other processing equipment, so that automatic uncoiling (uncoiling) is realized, however, in the process of uncoiling the coiled metal plates by traction, the coiled metal plates in the prior art have larger weight and larger inertia, the coiled metal plates can be driven to rotate only by providing larger pulling force when the traction devices draw the coiled metal plates, and the coiled metal plates can be stopped after rotating by continuing to rotate a certain angle under the action of inertia, so that the uncoiled part of the coiled metal plates is in two extreme states of over-tightening or over-loosening, and the working stability is low; in addition, as the metal sheet coil is gradually unwound, the weight of the metal sheet coil on the rotating shaft is gradually reduced, the inertia is also gradually reduced, and the traction force required to be provided by the traction device is also gradually reduced, but the actual output power of the traction device is not changed, and the traction device needs to operate in a maximum output power state (the maximum output power state refers to the output power required for driving the initial metal sheet coil to rotate), so that the energy consumption required for unwinding is high.

Disclosure of Invention

In view of this, a sheet metal uncoiling device is proposed that achieves improved stability of the uncoiling operation and reduced energy consumption required for uncoiling.

The application provides a metal plate uncoiling device which comprises a support, a base and a rotating shaft, wherein the support is fixedly connected with the base, the rotating shaft is rotatably connected with the support, the rotating shaft is horizontally arranged, the metal plate uncoiling device further comprises an upper guide roller, a lower guide roller and a movable counterweight roller, the upper guide roller is positioned above the lower guide roller, the upper guide roller and the lower guide roller are respectively arranged in parallel with the rotating shaft and are respectively rotatably connected with the support, the movable counterweight roller is arranged in parallel with the rotating shaft and is positioned below the rotating shaft, a part of a metal plate coil to be uncoiled is sleeved on the rotating shaft, the end part of the uncoiled part of the metal plate coil is inserted between the upper guide roller and the lower guide roller, the movable counterweight roller is positioned above the middle part of the uncoiled part of the metal plate coil, the lower surface of the movable counterweight roller is positioned on the upper surface of the middle part of the uncoiled part of the metal plate coil, and the lower guide roller is higher than the movable counterweight roller.

In some possible embodiments of the application, the side of the upper guide roller and the lower guide roller that is close to each other is lower than the lower surface of the portion of the sheet metal coil to be unwound.

In some possible embodiments of the present application, the metal plate uncoiling device further includes a radial anti-drop rod, the radial anti-drop rod is disposed parallel to the rotation shaft, one end of the radial anti-drop rod is fixedly connected with the support, the radial anti-drop rod is located inside the movable counterweight drum, and an inner top surface of the movable counterweight drum is in contact fit with an upper surface of the radial anti-drop rod and can slide relatively.

In some possible embodiments of the present application, a flexible rubber layer is fixedly connected to the outer side surface of the movable counterweight roller.

In some possible embodiments of the present application, a first axial anti-drop plate is fixedly connected to the radial anti-drop rod, the first axial anti-drop plate is located at one end of the radial anti-drop rod away from the bracket, and the top of the movable counterweight roller is located between the first axial anti-drop plate and the bracket.

In some possible embodiments of the present application, a second axial anti-drop plate is fixedly connected to the radial anti-drop rod, the top of the movable counterweight roller is located between the first axial anti-drop plate and the second axial anti-drop plate, and two ends of the movable counterweight roller are respectively in contact fit with one surface of the first axial anti-drop plate and one surface of the second axial anti-drop plate, which are close to each other, and can slide relatively.

In some possible embodiments of the present application, the metal plate uncoiling device further includes a first support roller, the first support roller is disposed parallel to the rotating shaft, the first support roller is rotatably connected with the bracket, the first support roller is located below the rotating shaft, the first support roller is located at one side of the movable counterweight roller away from the lower guide roller, the lower surface of the middle of the uncoiled portion of the metal plate coil is in contact fit with the outer side surface of the first support roller, and the central axis of the first support roller is lower than that of the movable counterweight roller.

In some possible embodiments of the present application, the metal sheet uncoiling device further includes a second support roller, the second support roller is disposed parallel to the rotating shaft, the second support roller is rotatably connected with the bracket, the second support roller is located below the rotating shaft, the second support roller is located at one side of the movable counterweight roller, which is close to the lower guide roller, the lower surface of the middle of the uncoiled portion of the metal sheet coil is in contact fit with the outer side surface of the second support roller, and the central axis of the second support roller and the central axis of the first support roller are located on the same horizontal plane.

In some possible embodiments of the present application, the metal plate uncoiling device further includes a limiting plate, the limiting plate is located right below the movable counterweight roller, the limiting plate is arranged parallel to the rotating shaft, the upper surface of the limiting plate is horizontally arranged, and the limiting plate is located below the middle of the uncoiled portion of the metal plate coil.

In some possible embodiments of the application, the movable weight roller is made of a magnetic metal material, and the limiting plate is made of a magnet.

ADVANTAGEOUS EFFECTS OF INVENTION

The movable counterweight roller freely rolls and releases the middle part of the uncoiled part of the metal plate coil on the upper surface of the middle part of the uncoiled part of the metal plate coil, and pressure is applied to the middle part of the uncoiled part of the metal plate coil by means of the gravity of the movable counterweight roller, so that the part of the metal plate coil to be uncoiled rotates to be uncoiled, and compared with the part of the metal plate coil to be uncoiled which is directly pulled and uncoiled, the maximum traction force required by uncoiling is smaller, the actual output power of the traction device is reduced, the energy-saving effect is achieved, and the stability of uncoiling work is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features and aspects of the application and together with the description, serve to explain the principles of the application.

Fig. 1 shows a schematic configuration of a metal plate uncoiling device provided in an exemplary embodiment of the present application.

Fig. 2 shows a side view of a sheet metal uncoiling device provided in an exemplary embodiment of the present application.

Fig. 3 is a cross-sectional view taken along line A-A of fig. 2.

Description of the reference numerals

100. A bracket; 102. a base; 104. a rotating shaft; 106. an upper guide roller; 108. a lower guide roller; 110. a movable counterweight roller; 112. a portion of the sheet metal coil to be unwound; 114. an end of the unwound portion of the sheet metal coil; 116. the middle part of the uncoiled part of the metal plate coil; 118. a radial anti-drop rod; 120. a flexible rubber layer; 122. a first axial anti-drop plate; 124. a second axial anti-drop plate; 126. a first backup roll; 128. a second support roller; 130. and a limiting plate.

Detailed Description

Various exemplary embodiments, features and aspects of the application will be described in detail below with reference to the drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated. The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. In addition, for the purposes of better illustrating the application, it will be apparent to one skilled in the art that numerous specific details are set forth in the various embodiments that follow. The application may be practiced without some of these specific details. In some embodiments, methods, means and elements well known to those skilled in the art have not been described in detail in order to highlight the gist of the present application.

As shown in fig. 1 to 3, an embodiment of the present application provides a metal plate uncoiling device, which includes a support 100, a base 102, a rotating shaft 104, wherein the support 100 is fixedly connected with the base 102, the rotating shaft 104 is rotatably connected with the support 100, the rotating shaft 104 is horizontally arranged, and further includes an upper guide roller 106, a lower guide roller 108, and a movable counterweight roller 110, the upper guide roller 106 is located above the lower guide roller 108, the upper guide roller 106 and the lower guide roller 108 are respectively arranged parallel to the rotating shaft 104 and are respectively rotatably connected with the support 100, the movable counterweight roller 110 is arranged parallel to the rotating shaft 104 and is located below the rotating shaft 104, a metal plate coil to be uncoiled 112 is sleeved on the rotating shaft 104, an end 114 of the uncoiled metal plate coil is inserted between an upper guide roller and a lower guide roller, the movable counterweight roller 110 is located above a middle 116 of the uncoiled metal plate coil, a lower surface of the movable counterweight roller 110 is located on an upper surface of the middle 116 of the uncoiled metal plate coil, and the lower guide roller 108 is higher than the movable counterweight roller 110.

In the metal plate uncoiling device provided in this embodiment, during use, a metal plate coil is sleeved on a rotating shaft 104, an end 114 of an uncoiled portion of the metal plate coil penetrates from below one side of a movable counterweight roller 110 and penetrates between an upper guide roller 106 and a lower guide roller 108 after penetrating from the other side of the metal plate coil, and finally is connected with a traction device (not shown in the figure), a middle 116 of the uncoiled portion of the metal plate coil sags under the action of gravity to form a vertical line shape, the movable counterweight roller 110 is placed at the center of the middle 116 of the uncoiled portion of the metal plate coil, the middle 116 of the uncoiled portion of the metal plate coil is extruded by the movable counterweight roller 110 to increase the sagging degree, and the self tension (or elastic force) of the middle 116 of the uncoiled portion of the metal plate coil keeps stable (the sagging degree is kept unchanged when the uncoiled portion is not subjected to other external forces); when the traction device pulls the end 114 of the uncoiled portion of the metal sheet coil, one side, close to the end 114 of the uncoiled portion of the metal sheet coil, of the middle 116 of the uncoiled portion of the metal sheet coil is gradually lifted, the movable counterweight roller 110 rolls in a direction away from the end 114 of the uncoiled portion of the metal sheet coil due to unbalance of supporting forces on two sides, the side, far away from the end 114 of the uncoiled portion of the metal sheet coil, of the middle 116 of the uncoiled portion of the metal sheet coil is pressed and increased to drag the portion 112 to be uncoiled, the metal sheet coil is gradually uncoiled, and when the traction device stops pulling, the side, close to the end 114 of the uncoiled portion of the metal sheet coil, of the middle 116 of the uncoiled portion of the metal sheet coil is gradually loosened to sag, the two sides of the movable counterweight roller 110 are unbalanced again to roll in a direction close to the end 114 of the uncoiled portion of the metal sheet coil until the two sides of the movable counterweight roller 110 are supported to be balanced, and at the moment, the movable counterweight roller 110 is positioned at the center of the middle 116 of the uncoiled portion of the metal sheet coil (i.e., returns to an initial balanced state), and is circulated; in the cyclic reciprocation process, the movable counterweight roller 110 rolls to release the middle part 116 of the uncoiled part of the metal sheet coil, and compared with the process of directly dragging and uncoiling the part 112 to be uncoiled of the metal sheet coil, the maximum traction force required by uncoiling is smaller, so that the actual output power of the traction device is reduced, and the energy-saving effect is achieved; on the other hand, as the middle part 116 of the uncoiled part of the metal sheet coil is released by the rolling of the movable counterweight roller 110, the stress change in unit time is small, and the stability of uncoiling work is improved; on the other hand, since the middle portion 116 of the unwound part of the sheet metal roll is lifted (sagged) by the traction, the movable counterweight drum 110 is lifted upward by a distance, the traction works on the movable counterweight drum 110, and since the mechanical transmission form of the movable counterweight drum 110 is in the form of a movable pulley, the maximum value of the traction is smaller than the weight of the movable counterweight drum 110, and the theoretically required traction is half of the weight of the movable counterweight drum 110, it should be understood that the weight of the movable counterweight drum 110 is much smaller than the weight of the sheet metal roll; specifically, the weight of the movable counterweight roller 110 is set to be smaller than the inertial resistance received when the end of the metal sheet coil is directly pulled to be unwound, and when the traction device stops traction, although the weight of the movable counterweight roller 110 is smaller than the inertial resistance received when the end of the metal sheet coil is directly pulled to be unwound, the acting force of the movable counterweight roller 110 on the middle 116 of the unwound part of the metal sheet coil is continuous, and as time goes by, the movable counterweight roller can drive the metal sheet coil to be unwound part 112 to rotate, so that the metal sheet coil to be unwound part 112 is gradually unwound, thereby being beneficial to realizing labor saving (indirectly realizing energy saving due to the reduction of the output power of the traction device) and achieving the effect of stable operation.

In some exemplary implementations of the present embodiment, the side of the upper guide roller 106 and the lower guide roller 108 that is adjacent to each other is lower than the lower surface of the portion 112 of the sheet metal coil to be unwound.

By the above-described exemplary embodiment of the present embodiment, it is facilitated to increase the degree of sagging of the middle portion 116 of the unwound part of the metal plate coil, to facilitate the rapid centering of the movable weight roller 110 (the center position of the middle portion 116 of the unwound part of the metal plate coil when both sides are supported in balance), and to facilitate the rapid response of the movable weight roller 110 to the force of the unbalance of the supports on both sides (the supporting portions on both sides of the movable weight roller 110 are steeper, in which the lifting of one side causes the movable weight roller 110 to rapidly respond and roll toward the other side), to promote the effect of rolling to release the middle portion 116 of the unwound part of the metal plate coil, to facilitate the reduction of the required maximum traction force, and to improve the smoothness of the unwinding work.

In some exemplary implementations of this embodiment, the metal plate uncoiling device further includes a radial anti-drop rod 118, the radial anti-drop rod 118 is disposed parallel to the rotation shaft 104, one end of the radial anti-drop rod 118 is fixedly connected to the bracket 100, the radial anti-drop rod 118 is located inside the movable weight drum 110, and an inner top surface of the movable weight drum 110 is in contact engagement with an upper surface of the radial anti-drop rod 118 and can slide relatively.

With the above-described exemplary embodiment of the present embodiment, since the movable weight roller 110 moves along with rolling and vertical directions, it is difficult to guide it, and the degree of freedom thereof is high, and the radial anti-drop rod 118 can restrict the movable range of the movable weight roller 110, which helps to avoid the excessive rolling distance of the movable weight roller 110 or the excessive vertical moving distance, and to avoid the movable weight roller 110 from being separated from the middle 116 of the uncoiled portion of the sheet metal coil.

In some exemplary implementations of this embodiment, a flexible rubber layer 120 is fixedly attached to the outer side of the movable weight drum 110.

By the above-described exemplary embodiment of the present embodiment, it is facilitated to reduce the scratch of the middle portion 116 of the unwound part of the metal sheet roll by the movable weight drum 110.

In some exemplary embodiments of the present embodiment, a first axial anti-drop plate 122 is fixedly connected to the radial anti-drop rod 118, the first axial anti-drop plate 122 is located at an end of the radial anti-drop rod 118 away from the bracket 100, and the top of the movable counterweight drum 110 is located between the first axial anti-drop plate 122 and the bracket 100.

By the above-described exemplary implementation of the present embodiment, the first axial drop plate 122 helps to prevent the movable weight drum 110 from sliding off the radial drop bar 118 in a direction away from the bracket 100.

In some exemplary implementations of the present embodiment, the second axial drop-preventing plate 124 is fixedly connected to the radial drop-preventing rod 118, and the top of the movable counterweight drum 110 is located between the first axial drop-preventing plate 122 and the second axial drop-preventing plate 124, and two ends of the movable counterweight drum 110 are respectively in contact engagement with and capable of sliding relative to one surfaces of the first axial drop-preventing plate 122 and the second axial drop-preventing plate 124 that are close to each other.

Through the above-described exemplary implementation manner of the present embodiment, the first axial drop preventing plate 122 and the second axial drop preventing plate 124 can axially limit the movable weight roller 110, so that the movable weight roller 110 is prevented from moving along the axial direction, which is helpful for making the center of the movable weight roller 110 be located at an intermediate position between two sides of the middle 116 of the uncoiled portion of the sheet metal coil, so that the acting force generated by the movable weight roller 110 on each place of the middle 116 of the uncoiled portion of the sheet metal coil is more balanced (the situation that two sides of the middle 116 of the uncoiled portion of the sheet metal coil are not easy to be high on one side and low on the other side).

In some exemplary implementations of the present embodiment, the sheet metal uncoiling device further includes a first support roller 126, the first support roller 126 is disposed parallel to the rotation shaft 104, the first support roller 126 is rotatably connected to the bracket 100, the first support roller 126 is located below the rotation shaft 104, the first support roller 126 is located at a side of the movable counterweight drum 110 away from the lower guide roller 108, a lower surface of the middle 116 of the uncoiled portion of the sheet metal coil is in contact fit with an outer side surface of the first support roller 126, and a central axis of the first support roller 126 is lower than a central axis of the movable counterweight drum 110.

With the above-described exemplary embodiment of the present embodiment, the first support roller 126 is capable of supporting the side of the middle portion 116 of the uncoiled portion of the metal coil away from the end 114 of the uncoiled portion of the metal coil, after the movable counterweight roller 110 rolls a distance away from the end 114 of the uncoiled portion of the metal coil, the side of the middle portion 116 of the uncoiled portion of the metal coil away from the end 114 of the uncoiled portion of the metal coil is not sagged due to the support of the first support roller 126, so that the movable counterweight roller 110 is prevented from rolling, at this time, the movement of the movable counterweight roller 110 is mainly lifted (rolling is reduced) upward, after the traction device stops traction, the uncoiling of the metal coil to-be-uncoiled portion 112 continues under inertia for a period of time, at this time, the middle portion 116 of the metal coil starts to relax, and the movable counterweight roller 110 rolls and resets toward the side of the end 114 of the uncoiled portion of the metal coil away from the end 114 of the uncoiled portion of the metal coil.

In some exemplary implementations of the present embodiment, the sheet metal uncoiling device further includes a second support roller 128, the second support roller 128 is disposed parallel to the rotation shaft 104, the second support roller 128 is rotatably connected to the bracket 100, the second support roller 128 is located below the rotation shaft 104, the second support roller 128 is located at one side of the movable counterweight drum 110 near the lower guide roller 108, the lower surface of the middle portion 116 of the uncoiled portion of the sheet metal coil is in contact fit with the outer side surface of the second support roller 128, and the central axis of the second support roller 128 is located on the same horizontal plane as the central axis of the first support roller 126.

With the above-described exemplary embodiment of the present embodiment, after the movable weight roller 110 is rolling-reset in the direction approaching the end 114 of the uncoiled portion of the metal sheet coil, the second support roller 128 supports the side of the middle portion 116 of the uncoiled portion of the metal sheet coil approaching the end 114 of the uncoiled portion of the metal sheet coil, preventing the side of the middle portion 116 of the uncoiled portion of the metal sheet coil approaching the end 114 of the uncoiled portion of the metal sheet coil from continuing to sag, helping to avoid excessive sagging of the side of the middle portion 116 of the uncoiled portion of the metal sheet coil approaching the end 114 of the uncoiled portion of the metal sheet coil.

In some exemplary implementations of the present embodiment, the sheet metal uncoiling device further includes a limiting plate 130, the limiting plate 130 is located directly below the movable counterweight drum 110, the limiting plate 130 is disposed parallel to the rotating shaft 104, an upper surface of the limiting plate 130 is disposed horizontally, and the limiting plate 130 is located below the middle 116 of the uncoiled portion of the sheet metal coil.

With the above-described exemplary embodiment of the present embodiment, although the radial drop preventing lever 118 can prevent the movable weight roller 110 from falling down, when the to-be-unwound part 112 of the metal sheet coil continues to be unwound under the inertia, an excessive sagging of the middle 116 of the unwound part of the metal sheet coil may occur, and at this time, the limiting plate 130 supports and limits the middle 116 of the unwound part of the metal sheet coil, thereby preventing the middle 116 of the unwound part of the metal sheet coil from sagging excessively.

In some exemplary implementations of the present embodiment, the movable weight drum 110 is made of a magnetic metal material and the limiting plate 130 is made of a magnet.

With the above-described exemplary embodiment of the present embodiment, the elastic forces of the metal sheet rolls of different types are different, when the elastic force of the metal sheet roll is large, the sagging degree of the middle portion 116 of the uncoiled portion of the metal sheet roll is small, and the rolling release action of the movable weight roller 110 is weakened, at this time, the stopper plate 130 applies an attractive force to the middle portion 116 of the uncoiled portion of the metal sheet roll, increases the sagging degree of the middle portion 116 of the uncoiled portion of the metal sheet roll, and if the metal sheet roll is a non-magnetic metal (e.g., copper plate), the stopper plate 130 applies an attractive force to the movable weight roller 110, increases the pressure generated by the movable weight roller 110 to the middle portion 116 of the uncoiled portion of the metal sheet roll, thereby increasing the sagging degree of the middle portion 116 of the uncoiled portion of the metal sheet roll.

The foregoing description of embodiments of the application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (10)

1. The utility model provides a sheet metal uncoiling device, includes support, base, pivot, the support with base fixed connection, the pivot with the support rotates to be connected, the pivot level sets up, its characterized in that still includes guide roll, lower guide roll, activity counter weight roller, go up the guide roll and be located lower guide roll top, go up the guide roll with lower guide roll respectively with pivot parallel arrangement just respectively with the support rotates to be connected, activity counter weight roller with pivot parallel arrangement just is located the below of pivot, the sheet metal coil is to be uncoiled the part cover in the pivot, the tip that the sheet metal coil has been uncoiled the part alternates go up the deflector roll with between the deflector roll down, activity counter weight roller is located the middle part top that the sheet metal coil has been uncoiled the part, the lower surface of activity counter weight roller is put at the upper surface that the middle part was uncoiled the sheet metal coil, lower guide roll is higher than activity counter weight roller.

2. A sheet metal uncoiling device according to claim 1, characterized in that a face of the upper guide roller and the lower guide roller that are close to each other is lower than a lower face of a portion of the sheet metal coil to be uncoiled.

3. The metal plate uncoiling device according to claim 1, further comprising a radial anti-drop rod, wherein the radial anti-drop rod is arranged in parallel with the rotating shaft, one end of the radial anti-drop rod is fixedly connected with the support, the radial anti-drop rod is positioned inside the movable counterweight roller, and the inner top surface of the movable counterweight roller is in contact fit with the upper surface of the radial anti-drop rod and can slide relatively.

4. A sheet metal uncoiling device according to claim 3, characterised in that the outer side of the movable counterweight drum is fixedly connected with a flexible rubber layer.

5. A sheet metal uncoiling device according to claim 3, wherein a first axial anti-drop plate is fixedly connected to the radial anti-drop rod, the first axial anti-drop plate is located at one end of the radial anti-drop rod away from the support, and the top of the movable counterweight drum is located between the first axial anti-drop plate and the support.

6. The metal plate uncoiling device according to claim 5, wherein a second axial anti-drop plate is fixedly connected to the radial anti-drop rod, the top of the movable counterweight roller is located between the first axial anti-drop plate and the second axial anti-drop plate, and two ends of the movable counterweight roller are respectively in contact fit with one surface of the first axial anti-drop plate and one surface of the second axial anti-drop plate, which are close to each other, and can slide relatively.

7. The sheet metal uncoiling device according to claim 1, further comprising a first support roller, wherein the first support roller is arranged in parallel with the rotating shaft, the first support roller is rotatably connected with the bracket, the first support roller is positioned below the rotating shaft, the first support roller is positioned on one side of the movable counterweight roller away from the lower guide roller, the lower surface of the middle part of the uncoiled part of the sheet metal coil is in contact fit with the outer side surface of the first support roller, and the central axis of the first support roller is lower than that of the movable counterweight roller.

8. The sheet metal uncoiling device according to claim 7, further comprising a second supporting roller, wherein the second supporting roller is arranged in parallel with the rotating shaft, the second supporting roller is rotatably connected with the bracket, the second supporting roller is positioned below the rotating shaft, the second supporting roller is positioned on one side of the movable counterweight roller, which is close to the lower guide roller, the lower surface of the middle part of the uncoiled part of the sheet metal coil is in contact fit with the outer side surface of the second supporting roller, and the central axis of the second supporting roller and the central axis of the first supporting roller are positioned on the same horizontal plane.

9. The sheet metal uncoiling device according to claim 1, further comprising a limiting plate, wherein the limiting plate is located right below the movable counterweight roller, the limiting plate is arranged in parallel with the rotating shaft, the upper surface of the limiting plate is horizontally arranged, and the limiting plate is located below the middle of the uncoiled portion of the sheet metal coil.

10. The sheet metal uncoiling device of claim 9, wherein the movable weight drum is made of a magnetic metal material and the limiting plate is made of a magnet.