An automatically tensioned rewinding and unwinding device

Abstract

The present invention claims protection for an automatic tensioning rewinding and unwinding device, which includes a tensioning frame. A main driving roller, a winding roller, a tensioning device and several fabric guiding rollers are arranged on the tensioning frame. The web of the original fabric roll extends to the main driving roller through the fabric guiding rollers to form a new fabric roll; the tensioning device includes an adjusting arm, a hollow roller, a telescopic member and a height-adjusting roller. There are two adjusting arms, which are respectively located on both sides of the tensioning frame, and the upper ends of the adjusting arms are rotatably connected to the tensioning frame; both ends of the hollow roller are respectively rotatably connected to the lower ends of the two adjusting arms for tensioning the web; the two adjusting arms are respectively provided with guiding grooves along the direction from the upper end to the lower end, the height-adjusting roller is arranged between the two guiding grooves, and there are two telescopic members which are respectively arranged on the two adjusting arms. The telescopic ends of the telescopic members are connected to the height-adjusting roller through the guiding grooves for controlling the height-adjusting roller to move along the guiding grooves. When the rewinding and unwinding device of the present application winds or unwinds the web, the adjusting arms will automatically find the balance point due to their own weight and the pulling force of the web.

Description

Technical Field

[0001] The present invention relates to the technical field of non-woven fabrics, and more specifically, it relates to a rewinding and unwinding device with automatic tensioning. Background Art

[0002] In the material processing industry, rewinding and unwinding devices are widely used in the processes of conveying, winding, and storing coils. Traditional rewinding and unwinding devices maintain the coil tension through mechanical tensioning devices (such as counterweights, springs, or cylinders), but there are the following problems:

[0003] 1. Dependence on manual adjustment: The tension needs to be manually adjusted according to the change of the coil diameter or the material properties, with low efficiency and easy to make mistakes.

[0004] 2. Poor dynamic response: During the start-stop or speed change stages, the tension fluctuates greatly, resulting in stretching deformation or fracture of the material.

[0005] 3. Insufficient control accuracy: It cannot adapt to the change of the coil diameter, the difference in material elasticity, and external disturbances in real time, affecting the product quality.

[0006] Although there are some electronically controlled tensioning solutions in the prior art, when producing products with insufficient strength or ultra-thin products, due to the tiny disturbances caused by environmental air flow disturbances or the machine itself, stable tensioning cannot be achieved during the winding process. Therefore, how to better tension the coil is exactly the technical problem to be solved in this application. Summary of the Invention

[0007] In view of the deficiencies of the prior art, the present invention proposes a rewinding and unwinding device with automatic tensioning, which adjusts the height of the height-adjusting roller and changes the tensioning ability of the tensioning device through the lever principle.

[0008] The present invention provides a rewinding and unwinding device with automatic tensioning, and the technical solution is as follows:

[0009] A rewinding and unwinding device with automatic tensioning includes a tensioning frame, on which a main driving roller, a winding roller, a tensioning device, and several fabric guiding rollers are arranged. The coil of the original fabric roll extends to the main driving roller through the fabric guiding rollers to form a new fabric roll. The winding roller is used to press the new fabric roll against the main driving roller, and the main driving roller is used to drive the new fabric roll to rotate; the tensioning device includes an adjusting arm, a hollow roller, a telescopic member, and a height-adjusting roller. There are two adjusting arms, which are respectively located on both sides of the tensioning frame, and the upper end of the adjusting arm is rotatably connected to the tensioning frame; both ends of the hollow roller are respectively rotatably connected to the lower ends of the two adjusting arms and are used to tension the coil; two guiding grooves are respectively formed in the two adjusting arms along the direction from the upper end to the lower end, the height-adjusting roller is arranged between the two guiding grooves, and there are two telescopic members which are respectively arranged on the two adjusting arms. The telescopic ends of the telescopic members are connected to the height-adjusting roller through the guiding grooves and are used to control the height-adjusting roller to move along the guiding grooves.

[0010] In summary, the above technical solution has the following beneficial effects: When the rewinding and unwinding device of the present application winds the coil material, the coil material passes through the guide cloth roller and is wound around the hollow roller. When the coil material is conveyed, a horizontal pulling force is applied to the hollow roller. Since the adjusting arm connected to the hollow roller is rotatably connected to the tensioning frame, after receiving the horizontal pulling force, the adjusting arm will break the original vertically downward due to its own weight and tilt at a certain angle. The adjusting arm forms an angle with the vertical direction, thereby tensioning the coil material. When the relaxation force of the coil material fluctuates due to external factors, the adjusting arm will automatically find the balance point under the action of its own weight and the pulling force of the coil material. The setting of the height-adjusting roller can change the length of the force arm for pulling the hollow roller by the coil material. The closer the height-adjusting roller is to the hollow roller, the more difficult it is for the coil material to pull the adjusting arm. The setting of the height-adjusting roller can adapt to coil materials of different thicknesses, so that the tilt angle of the adjusting arm swings within a suitable range. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the tensioning frame of an automatically tensioning rewinding and unwinding device;

[0012] Figure 2 Schematic diagram of the adjusting arm of an automatically tensioning rewinding and unwinding device;

[0013] Figure 3 Schematic diagram of the connection of the controller of an automatically tensioning rewinding and unwinding device;

[0014] Figure 4 Schematic diagram of the height-adjusting roller of an automatically tensioning rewinding and unwinding device.

[0015] Reference numerals: 1, original cloth roll; 2, new cloth roll; 10, tensioning frame; 20, main driving roller; 30, winding roller; 40, tensioning device; 41, adjusting arm; 411, guide groove; 42, hollow roller; 43, telescopic member; 44, height-adjusting roller; 441, card entrance; 442, card-in column; 50, guide cloth roller; 51, inlet cloth roller; 52, outlet cloth roller; 53, support roller; 54, turning roller; 60, limit block; 70, controller; 80, induction piece; 90, counterweight ring; 91, through-column opening. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] An automatically tensioned rewinding and unwinding device, which includes a tensioning frame 10. A main driving roller 20, a winding roller 30, a tensioning device 40 and several fabric guiding rollers 50 are arranged on the tensioning frame 10. The coil material of the original fabric roll 1 extends to the main driving roller 20 through the fabric guiding rollers 50 to form a new fabric roll 2. The winding roller 30 is used to press the new fabric roll 2 against the main driving roller 20, and the main driving roller 20 is used to drive the new fabric roll 2 to rotate; The tensioning device 40 includes an adjusting arm 41, a hollow roller 42, a telescopic member 43 and a height-adjusting roller 44. There are two adjusting arms 41, which are respectively located on both sides of the tensioning frame 10, and the upper ends of the adjusting arms 41 are rotatably connected to the tensioning frame 10; Both ends of the hollow roller 42 are respectively rotatably connected to the lower ends of the two adjusting arms 41 for tensioning the coil material; The two adjusting arms 41 are respectively provided with guiding grooves 411 along the direction from the upper end to the lower end. The height-adjusting roller 44 is arranged between the two guiding grooves 411. There are two telescopic members 43, which are respectively arranged on the two adjusting arms 41. The telescopic ends of the telescopic members 43 are connected to the height-adjusting roller 44 through the guiding grooves 411 for controlling the height-adjusting roller 44 to move along the guiding grooves 411.

[0018] When the rewinding and unwinding device of the present application winds the coil material, the coil material passes through the fabric guiding rollers 50 and winds around the hollow roller 42. When the coil material is conveyed, a horizontal pulling force is applied to the hollow roller 42. Since the adjusting arm 41 connected to the hollow roller 42 is rotatably connected to the tensioning frame 10, after receiving the horizontal pulling force, the adjusting arm 41 will break the original vertical downward due to its own weight and tilt at a certain angle. The adjusting arm 41 forms an angle with the vertical direction, thereby tensioning the coil material. When the tension of the coil material fluctuates due to external factors, the adjusting arm 41 will automatically find a balance point due to the action of its own weight and the pulling force of the coil material. The setting of the height-adjusting roller 44 can change the length of the force arm for the coil material to pull the hollow roller 42. The closer the height-adjusting roller 44 is to the hollow roller 42, the more difficult it is for the coil material to pull the adjusting arm 41. The setting of the height-adjusting roller 44 can adapt to coil materials of different thicknesses, so that the tilt angle of the adjusting arm 41 swings within a suitable range.

[0019] The fabric guiding roller 50 includes a fabric inlet roller 51, a fabric outlet roller 52, a support roller 53 and a turning roller 54; The fabric inlet roller 51 is arranged on one side of the tensioning frame 10 close to the original fabric roll 1 for guiding the coil material into the tensioning frame 10; The adjusting arm 41 is located on the side of the fabric inlet roller 51 away from the original fabric roll 1; The fabric outlet roller 52 is located on the side of the adjusting arm 41 away from the original fabric roll 1 and above the hollow roller 42; The support roller 53 is located on the side of the adjusting arm 41 away from the original fabric roll 1 and below the hollow roller 42; The turning roller 54 is located between the support roller 53 and the main driving roller 20 for adjusting the direction of the coil material entering the main driving roller 20. The coil material passes through the fabric inlet roller 51, the fabric outlet roller 52, the hollow roller 42, the support roller 53 and the turning roller 54 in sequence and then enters the main driving roller 20 to form a new fabric roll 2.

[0020] The hollow roller 42 is horizontally located on the side of the fabric delivery roller 52 and the support roller 53 close to the original fabric roll 1, and is vertically located between the fabric delivery roller 52 and the support roller 53. The coiled material exerts a horizontal force on the hollow roller 42. After the adjusting arm 41 is stressed and tilted, it exerts a reverse pulling force on the coiled material, so as to keep the coiled material taut during the transmission process. The axis of the original fabric roll is fixed at a position and is dragged to rotate around the axis. There are two main driving rollers 20, which are used to support the new fabric roll 2.

[0021] A limit block 60 is provided on the tensioning frame 10. The limit block 60 is detachably fixed on one side of the adjusting arm 41 in the tilting direction. When the adjusting arm 41 tilts and abuts against the limit block 60, the limit block 60 is used to limit the tilting angle of the adjusting arm 41.

[0022] The pulling force of the coiled material is related to the thickness of the coiled material itself, the weight of the original fabric roll 1, etc. The greater the pulling force of the coiled material, the greater the tilting angle between the adjusting arm 41 and the vertical direction. After the new fabric roll 2 is unrolled, if the tilting angle between the adjusting arm 41 and the vertical direction is too large, the disturbance of the adjusting arm 41 to the coiled material after it swings back is also greater. In order to avoid the disturbance caused by the swing-back of the adjusting arm 41, it is better to control the angle between the adjusting arm 41 and the vertical direction within five degrees. Through the setting of the limit block 60, the tilting angle of the adjusting arm 41 can be prevented from exceeding the angle when the limit block 60 abuts against the adjusting arm 41. The limited angle is changed by adjusting the distance between the limit block 60 and the adjusting arm 41. The limited angle can be manually controlled within five degrees, ten degrees or other angles, and five degrees is preferred. The limit block 60 is fixed at a suitable position on the tensioning frame 10 by means of screws or clamps, etc.

[0023] It also includes a controller 70. An induction sheet 80 is provided on the side of the adjusting arm 41 close to the limit block 60. The induction sheet 80, the telescopic member 43 and the main driving roller 20 are respectively electrically connected to the controller 70. When the induction sheet 80 contacts the limit block 60, the controller 70 controls the telescopic member 43 to extend, so that the height-adjusting roller 44 moves along the guide groove 411 in the direction close to the hollow roller 42.

[0024] The height adjustment roller 44 is initially located at the top of the guide groove 411. If the coil pulls the adjustment arm 41 to swing without touching the limit block 60, the controller 70 will not operate. When the controller 70 determines that the sensing sheet 80 is in contact with the limit block 60, the controller 70 controls the telescopic member 43 to extend. When the controller 70 determines that the sensing sheet 80 is not in contact with the limit block 60, the controller 70 controls the telescopic member 43 to stop extending. When the controller 70 determines that the main driving roller 20 stops rotating, the controller controls the telescopic member 43 to reset. Through the setting of the sensing sheet 80 and the limit block 60, the adjustment arm 41 can be used to tension the coil within a fixed swing angle. If the tension of the coil is too large, the sensing sheet 80 touches the limit block 60 after the height adjustment roller 44 is adjusted to the bottom, and the coil can also be tensioned, and the problem of the adjustment arm 41 rotating too much and rebounding violently is avoided. The telescopic member 43 is an accessory with telescopic function such as a cylinder, an electromagnet or a controllable telescopic rod. The telescopic member 43 includes a control end and a telescopic end. The control end is connected to the upper end of the adjustment arm 41 to control the telescopic end to extend and retract. The extension distance of the telescopic member 43 is controlled by the controller 70, and the extension length is within the range of the guide groove 411.

[0025] It also includes a counterweight ring 90, which is used to be detachably connected to the height adjustment roller 44. When the height adjustment roller 44 moves to the bottom of the guide groove 411, if the induction sheet 80 still conflicts with the limit block 60, it means that the counterweight of the height adjustment roller 44 itself is not enough. Although this can also achieve the effect of tensioning the coiled material, the induction sheet 80 on the adjustment arm 41 will be damaged if it conflicts with the limit block 60 for a long time. Therefore, it is best to let the adjustment arm 41 swing within the restricted angle. After the counterweight ring 90 is set on the height adjustment roller 44, the weight of the height adjustment roller 44 can be increased to adapt to a greater pulling force.

[0026] The height adjustment roller 44 is provided with an annular snap-in opening 441, thereby forming a snap-in column 442 on the height adjustment roller 44, and the weight ring 90 is provided with a column-penetrating opening 91, the width of which is greater than the diameter of the snap-in column 442 and less than the diameter of the height adjustment roller 44. The weight ring 90 is C-shaped, and the inner ring diameter of the weight ring 90 is equal to or greater than the diameter of the height adjustment roller 44. After the column-penetrating opening 91 of the weight ring 90 passes through the snap-in column 442, it moves to both sides of the height adjustment roller 44, and the width of the column-penetrating opening 91 is less than the diameter of the height adjustment roller 44 so that it will not fall off.

[0027] The height-adjusting roller 44 is provided with a chamfer at the clamping inlet 441. The chamfer can allow the weight ring 90 to pass through the height-adjusting roller 44 better.

[0028] The height-adjusting roller 44 is provided with external threads, and the inner ring of the counterweight ring 90 is provided with internal threads. The counterweight ring 90 and the height-adjusting roller 44 are connected by threads. In order to prevent the counterweight ring 90 from sliding or rotating during the shaking of the adjusting arm 41, after the counterweight ring 90 passes through the clamping column 442, it is screwed onto the counterweight ring 90 to fix the counterweight ring 90, thereby preventing the counterweight ring 90 from interfering with the coil material.

[0029] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. An automatic tensioning rewinding and unwinding device, characterized in that: The invention comprises a tensioning frame (10), on which a main driving roller (20), a winding roller (30), a tensioning device (40) and a plurality of cloth guide rollers (50) are arranged. The coil of the original cloth roll (1) extends to the main driving roller (20) through the cloth guide roller (50) to form a new cloth roll (2). The winding roller (30) is used to push the new cloth roll (2) against the main driving roller (20), and the main driving roller (20) is used to drive the new cloth roll (2) to rotate. The tensioning device (40) comprises an adjusting arm (41), a hollow roller (42), a telescopic member (43) and a height-adjusting roller (44); two adjusting arms (41) are provided and are respectively located on both sides of the tensioning frame (10); the upper end of the adjusting arm (41) is rotatably connected to the tensioning frame (10); The two ends of the hollow roller (42) are rotatably connected to the lower ends of the two adjustment arms (41) respectively, and are used for tensioning the coiled material; The two adjusting arms (41) are respectively provided with guide grooves (411) in a direction from the upper end to the lower end; the height adjustment roller (44) is arranged between the two guide grooves (411); two telescopic members (43) are provided and are respectively arranged on the two adjusting arms (41); the telescopic ends of the telescopic members (43) are connected to the height adjustment roller (44) through the guide groove (411) and are used to control the height adjustment roller (44) to move along the guide groove (411); A limit block (60) is provided on the tensioning frame (10), and the limit block (60) is detachably fixed on one side of the tilting direction of the adjusting arm (41); when the adjusting arm (41) tilts and contacts the limit block (60), the limit block (60) is used to limit the tilting angle of the adjusting arm (41); The invention also comprises a controller (70). A sensing sheet (80) is arranged on one side of the adjusting arm (41) close to the limit block (60). The sensing sheet (80), the telescopic member (43) and the main driving roller (20) are respectively electrically connected to the controller (70). When the sensing sheet (80) and the limit block (60) are in contact, the controller (70) controls the telescopic member (43) to extend, so that the height-adjusting roller (44) moves along the guide groove (411) in a direction close to the hollow roller (42).

2. The automatic tensioning rewinding and unwinding device according to claim 1, characterized in that: The cloth guide roller (50) comprises a cloth feed roller (51), a cloth discharge roller (52), a support roller (53) and a steering roller (54); The cloth feeding roller (51) is arranged on a side of the tensioning frame (10) close to the original cloth roll (1) and is used to guide the roll into the tensioning frame (10); The adjusting arm (41) is located on a side of the cloth feeding roller (51) away from the original cloth roll (1); The cloth outlet roller (52) is located on a side of the adjusting arm (41) away from the original cloth roll (1) and is located above the hollow roller (42); The support roller (53) is located on a side of the adjusting arm (41) away from the original cloth roll (1) and below the hollow roller (42); The steering roller (54) is located between the supporting roller (53) and the main driving roller (20) and is used to adjust the direction in which the coiled material enters the main driving roller (20). The coiled material passes through the cloth feed roller (51), the cloth outlet roller (52), the hollow roller (42), the supporting roller (53) and the steering roller (54) in sequence and then enters the main driving roller (20) to form a new cloth roll (2).

3. The automatic tensioning rewinding and unwinding device according to claim 1, characterized in that: It also includes a weight ring (90), and the weight ring (90) is used for being detachably connected to the height adjustment roller (44).

4. The automatic tensioning rewinding and unwinding device according to claim 3, characterized in that: The height adjustment roller (44) is provided with an annular snap-in opening (441), thereby forming a snap-in column (442) on the height adjustment roller (44); the counterweight ring (90) is provided with a column penetration opening (91), and the width of the column penetration opening (91) is greater than the diameter of the snap-in column (442) and smaller than the diameter of the height adjustment roller (44).

5. The automatic tensioning rewinding and unwinding device according to claim 4, characterized in that: The height-adjusting roller (44) is provided with a chamfer at the clamping inlet (441).

6. The automatic tensioning rewinding and unwinding device according to claim 4, characterized in that: The height adjustment roller (44) is provided with an external thread, the inner ring of the counterweight ring (90) is provided with an internal thread, and the counterweight ring (90) and the height adjustment roller (44) are connected via threads.

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