A metal sheet coil unwinding and tensioning device

Abstract

The utility model discloses a kind of metal sheet roll material unwinding tensioning devices, belong to metal sheet manufacturing technical field.It is including fixed frame, and fixed frame is half open, the side surface of the open of fixed frame is rotatably connected with pivot, the inside of pivot has fixing piece, fixing piece is used to fix roll material on the outside of pivot, the outside of fixed frame is equipped with driving part, driving part is used to drive pivot rotation, the inside of the closed of fixed frame is equipped with fixed frame, the top surface of fixed frame is equipped with electric telescopic handle, the telescopic end of electric telescopic handle and fixed frame are connected, fixed frame is U-shaped, connecting shaft is rotatably connected in the recess of fixed frame through bearing, air bag is fixedly installed on the outside of connecting shaft, connecting shaft has air passage piece, air passage piece is transported to air bag inside from outside gas source.

Description

Technical Field

[0001] This utility model relates to the field of metal sheet manufacturing technology, specifically a metal sheet roll unwinding and tensioning device. Background Technology

[0002] In the processing and production of sheet metal, the unwinding process is a crucial link connecting the storage of the coil with subsequent processes such as cutting, stamping, and welding. Tension control during unwinding directly determines the flatness and processing accuracy of the sheet metal. Currently, the mainstream tension control methods in the industry mostly rely on adjusting the unwinding speed. This involves changing the rotation speed of the unwinding rollers to create a speed difference between the unwinding and subsequent traction processes, thereby generating tension. The specific operation methods are mainly divided into two categories: One type is mechanical speed regulation, which changes the speed of the unwinding roller by changing the number of teeth on the transmission gear, adjusting the diameter of the pulley, or manually adjusting the friction of the friction clutch; the other type is electrical speed regulation, which uses a frequency converter to control the output speed of the unwinding motor, or indirectly adjusts the unwinding speed to control the tension through closed-loop control of the servo motor speed.

[0003] However, this method of adjusting tension by speed has drawbacks: it is cumbersome to operate and difficult to adapt to the processing requirements of thin metal sheets. The diameter of the metal sheet roll will continuously decrease during the unwinding process. If the tension is adjusted only by speed, the unwinding speed needs to be frequently corrected according to the changes in the roll diameter. However, mechanical speed adjustment requires stopping the machine to replace gears or pulleys. Although electrical speed adjustment can be adjusted without stopping the machine, it requires manual continuous monitoring of the sheet tension and repeated fine-tuning of the speed. The adjustment process is lagging and can easily lead to short-term fluctuations in tension, causing the sheet to wrinkle or be overstretched. Utility Model Content

[0004] The purpose of this invention is to provide a metal sheet roll unwinding and tensioning device to solve the problems mentioned in the background art.

[0005] In view of the above problems, the technical solution proposed by this utility model is as follows: A metal sheet roll unwinding and tensioning device includes a fixed frame, which is semi-open. A rotating shaft is rotatably connected to the open side of the fixed frame. The rotating shaft has a fixing component inside for securing the roll to the outside of the rotating shaft. A driving component is provided outside the fixed frame for driving the rotating shaft to rotate. A fixed bracket is provided inside the closed part of the fixed frame. An electric telescopic rod is mounted on the top surface of the fixed frame. The telescopic end of the electric telescopic rod is connected to the fixed bracket. The fixed bracket is U-shaped. A connecting shaft is rotatably connected to the groove of the fixed bracket via a bearing. An air bladder is fixedly installed on the outside of the connecting shaft. A venting component is provided inside the connecting shaft to deliver external air to the air bladder. The semi-open shape of the fixed frame facilitates the operator's installation of the roll onto the rotating shaft and provides a stable mounting base for components such as the fixed bracket and the electric telescopic rod. The rotating shaft is rotatably connected to the fixed frame. With its internal fixing components, the coil material is securely fixed to the outside of the rotating shaft, preventing deviation or loosening during unwinding. The drive component outside the fixing frame drives the rotating shaft to rotate, providing power for unwinding the coil material. The U-shaped fixing frame is rotatably connected to the connecting shaft via bearings, ensuring smooth rotation of the airbag and reducing frictional resistance during unwinding of the metal sheet. The electric telescopic rod connects the top surface of the fixing frame to the fixing frame, allowing for height adjustment of the fixing frame and airbag, ensuring close contact between the airbag and coil materials of different diameters or metal sheets at different unwinding stages. The airbag outside the connecting shaft, in conjunction with a venting component, delivers external air to the airbag, allowing adjustment of the airbag's expansion based on the required tension of the metal sheet. This pressure from the airbag on the metal sheet achieves tension control. The coordinated operation of all components ensures stable unwinding and precise tensioning of the coil material, guaranteeing flatness during unwinding and meeting subsequent processing requirements.

[0006] Furthermore, the venting component includes a one-way valve and a vent valve installed at both ends of the fixed frame. A first air passage and several second air passages are provided within the connecting shaft. The two ends of the first air passage are respectively connected to the one-way valve and the vent valve. The one-way valve is connected to an air pump via a rotary joint. Several second air passages are connected to the first air passage. Several air holes are provided on the inner wall of the airbag. The free ends of the second air passages are connected to the air holes. The one-way valve and vent valve at both ends of the fixed frame respectively enable unidirectional gas input and controllable gas discharge. The one-way valve is connected to the air pump via a rotary joint. The rotary joint prevents the air pump connecting pipe from tangling when the connecting shaft rotates, ensuring a stable gas supply. The first air passage inside serves as the main air passage, with its two ends connected to a one-way valve and a vent valve, respectively. It can guide the gas input from the one-way valve to the second air passage, or expel the gas from the airbag through the vent valve. Several second air passages are connected to the first air passage, and the free ends of the second air passages are connected to the air holes on the inner wall of the airbag. This allows the gas in the first air passage to be evenly delivered to all parts of the airbag, so that the airbag expands evenly. This ensures that the pressure of the airbag on the metal sheet is evenly distributed, avoiding local wrinkles or excessive stretching of the metal sheet due to uneven pressure. At the same time, the air pressure inside the airbag can be precisely controlled through the vent valve, and the air pump can be used to quickly adjust the degree of airbag expansion to meet the tension requirements of the metal sheet under different working conditions.

[0007] Furthermore, the fixed frame, connecting shaft, one-way valve, vent valve, and first air passage are all coaxially arranged, which ensures that the relative position of the connecting shaft, one-way valve, and vent valve remains stable when the connecting shaft rotates within the fixed frame. This avoids gas leakage at the connection point due to misalignment and ensures smooth gas delivery between the one-way valve, first air passage, and vent valve. At the same time, the coaxial arrangement allows the gas in the first air passage to be more evenly distributed to each of the second air passages, further ensuring the uniformity of airbag expansion. Moreover, this arrangement reduces eccentric vibration when the connecting shaft rotates.

[0008] Furthermore, the number of air holes and second air passages is the same, which ensures that each second air passage has a corresponding air hole to cooperate with, so that all the gas in the second air passage can enter the airbag smoothly through the air hole.

[0009] Furthermore, the fixing component includes a drive shaft rotatably mounted inside the rotating shaft and a first motor fixedly mounted inside the rotating shaft. The output end of the first motor is connected to the drive shaft. Four sets of protrusions are equidistantly mounted on the outer circumference of the drive shaft. Four sets of sliding grooves are equidistantly opened on the outer circumference of the rotating shaft. Abutments slide within each groove. The protrusions press against the bottom surface of the abutments. A connecting frame is mounted on one end of the abutment located inside the rotating shaft. A spring connects the connecting frame and the inner wall of the rotating shaft. The first motor is fixed inside the rotating shaft to provide power for the rotation of the drive shaft, and the output end of the first motor is connected to the drive shaft. The shaft drive connection enables precise speed control of the drive shaft. Four sets of protrusions, evenly spaced circumferentially on the outer side of the drive shaft, work in conjunction with four sets of abutments within equally spaced circumferentially spaced sliding grooves on the outer side of the rotating shaft. The protrusions can press against the bottom surface of the abutments, allowing the abutments to slide stably within the grooves. The circumferentially evenly distributed distribution of the four sets of protrusions and abutments ensures that the compressive force exerted by the abutments on the coil is evenly distributed within the inner circle of the coil, preventing excessive localized stress that could lead to deformation. A spring between the connecting frame at the inner end of the abutment and the inner wall of the rotating shaft allows the abutments to retract into the sliding grooves via the elastic restoring force of the spring when the protrusions no longer compress the abutments, facilitating the disassembly and replacement of the coil.

[0010] Furthermore, the top surfaces of both the protrusion and the abutment are curved. When the protrusion rotates and presses against the bottom surface of the abutment, the curved surface contact reduces the frictional resistance between the protrusion and the abutment, allowing the protrusion to push the abutment to slide more smoothly in the groove. This avoids jamming caused by flat contact surfaces, reduces wear between components, and extends the service life of the protrusion and the abutment. At the same time, the curved surface design allows the pressure exerted by the protrusion on the abutment to change gradually, rather than suddenly applying a large pressure. This avoids the abutment sliding too fast due to a sudden increase in pressure, which could impact the inner ring of the coil and prevent deformation or damage to the inner ring of the coil. In addition, the curved top surface of the abutment increases the contact area between the abutment and the inner ring of the coil when the abutment contacts it, allowing the pressure to be distributed more evenly on the inner ring of the coil. This further improves the stability of the coil fixation and prevents the coil from shifting due to improper local force during unwinding.

[0011] Furthermore, the driving component includes a driving housing located outside the fixed frame. A second motor and a reducer are installed inside the driving housing. The output end of the second motor is drive-connected to the input end of the reducer, and the output end of the reducer is drive-connected to the rotating shaft. A heat dissipation filter is embedded on the surface of the driving housing. The driving housing's location outside the fixed frame prevents interference between the components inside the driving housing and the coiled material, airbags, and other components inside the fixed frame. It also provides a protective shell for the second motor and reducer, preventing external dust and impurities from entering and affecting the operation of the components. The second motor provides power for the rotation of the rotating shaft, and the reducer is drive-connected to both the output end of the second motor and the rotating shaft. It can convert the high speed of the second motor into the low speed required by the shaft and increase the torque, so that the speed of the shaft driving the unwinding of the coil is stable, avoiding the loss of control of the unwinding of the metal sheet due to excessive speed, or the inability to drive the coil to rotate due to insufficient torque; the heat dissipation filter embedded on the surface of the drive box can filter the dust in the air while ensuring the airflow between the inside and outside of the drive box, preventing the dust from entering the drive box and adhering to the second motor and reducer, affecting the heat dissipation effect, thereby ensuring that the second motor and reducer operate in a suitable temperature environment, extending their service life, ensuring that the drive components provide stable power to the shaft for a long time, and ensuring the continuity of the coil unwinding process.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This metal sheet roll unwinding and tensioning device achieves rapid adjustment of tension through an air bladder in conjunction with a ventilation component and an electric telescopic rod. The ventilation component can quickly change the air pressure inside the air bladder through an air pump and a vent valve. The electric telescopic rod can fine-tune the contact pressure between the air bladder and the metal sheet. Unlike traditional mechanical speed regulation, there is no need to stop the machine to replace parts or manually adjust the speed repeatedly. The adjustment response is rapid. Moreover, the air bladder achieves uniform expansion through a second air channel and a consistent number of air holes, resulting in uniform pressure distribution on the metal sheet. Combined with components set on the coaxial axis, it ensures stable air pressure and high tensioning accuracy, effectively avoiding tension fluctuations caused by changes in roll diameter and preventing wrinkles or excessive stretching of the metal sheet. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the metal sheet roll unwinding and tensioning device disclosed in an embodiment of the present utility model; Figure 2 This is a first cross-sectional structural diagram of the metal sheet roll unwinding and tensioning device disclosed in this embodiment of the present utility model; Figure 3 This is a second cross-sectional structural diagram of the metal sheet roll unwinding and tensioning device disclosed in an embodiment of the present utility model; Figure 4 This is a schematic diagram of the third cross-sectional structure of the metal sheet roll unwinding and tensioning device disclosed in this embodiment of the utility model; Figure 5 for Figure 4A magnified schematic diagram of structure A in the middle.

[0014] In the diagram: 1. Fixed frame; 2. Drive box; 3. Rotating shaft; 4. Abutment; 5. Electric telescopic rod; 6. Fixed frame; 7. Airbag; 8. Connecting frame; 9. Spring; 10. Drive shaft; 11. Protrusion; 12. First motor; 13. Slide groove; 14. Connecting shaft; 15. First air passage; 16. Second air passage; 17. Air hole. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1-5This utility model provides a technical solution: a metal sheet roll unwinding and tensioning device, including a fixed frame 1, which is semi-open. A rotating shaft 3 is rotatably connected to the side of the open part of the fixed frame 1. The rotating shaft 3 has a fixing component inside, which is used to fix the roll to the outside of the rotating shaft 3. A driving component is provided outside the fixed frame 1, which is used to drive the rotating shaft 3 to rotate. A fixing frame 6 is provided inside the closed part of the fixed frame 1. An electric telescopic rod 5 is installed on the top surface of the fixed frame 1. The telescopic end of the electric telescopic rod 5 is connected to the fixing frame 6. The fixing frame 6 is U-shaped. A connecting shaft 14 is rotatably connected to the groove of the fixing frame 6 through a bearing. An air bag 7 is fixedly installed on the outside of the connecting shaft 14. A venting component is provided inside the connecting shaft 14, which delivers an external air source to the air bag 7. First, the metal sheet roll is transported to the open part of the fixed frame 1 and the roll is placed on the outside of the rotating shaft 3. Then, the fixing component inside the rotating shaft 3 is activated, so that the fixing component firmly fixes the roll to the rotating shaft 3, preventing the roll from rotating during subsequent rotation. Displacement occurs in the middle; then, according to the specifications of the metal sheet and the required tension, gas from an external air source is delivered to the connecting shaft 14 through the venting component, and then the connecting shaft 14 introduces the gas into the airbag 7, causing the airbag 7 to inflate to a suitable degree; then, the electric telescopic rod 5 is activated, and the telescopic end of the electric telescopic rod 5 drives the fixing frame 6 to move up and down. The fixing frame 6 drives the connecting shaft 14 and the airbag 7 to move synchronously until the airbag 7 is in close contact with the surface of the metal sheet and reaches the preset pressure; finally, the drive component outside the fixing frame 1 is activated, and the drive component drives the rotating shaft 3 to rotate. The rotating shaft 3 drives the coil to rotate synchronously for unwinding. During the unwinding process, the metal sheet contacts the airbag 7. Under the drive of the metal sheet, the airbag 7 rotates with the connecting shaft 14 through the bearing in the groove of the fixing frame 6. At the same time, the pressure of the airbag 7 continues to act on the metal sheet to achieve tension on the metal sheet. If it is necessary to adjust the tension, the amount of gas in the airbag 7 can be increased or decreased through the venting component, or the contact pressure between the airbag 7 and the metal sheet can be finely adjusted through the electric telescopic rod 5.

[0017] Specifically, a tension detection sensor can be installed within the fixed frame 1 to detect the tension of the metal sheet. The tension detection sensor is installed downstream of the contact point between the metal sheet and the airbag 7, and the sensor's detection roller is in close contact with the surface of the metal sheet. The tension detection sensor senses the pressure applied to it by the metal sheet through the detection roller, converts the pressure signal into an electrical signal, and transmits it to the control system of the device. The control system processes the electrical signal, calculates the current actual tension value of the metal sheet, and compares it with the preset target tension value, providing data for subsequent air intake adjustment.

[0018] As an embodiment of this utility model, the venting component further includes a one-way valve and a vent valve installed at both ends of the fixed frame 6. A first air passage 15 and several second air passages 16 are provided inside the connecting shaft 14. The two ends of the first air passage 15 are respectively connected to the one-way valve and the vent valve. The one-way valve is connected to an air pump via a rotary joint. The several second air passages 16 are connected to the first air passage 15. Several air holes 17 are provided on the inner wall of the airbag 7. The free ends of the second air passages 16 are connected to the air holes 17. When it is necessary to inflate the airbag 7 to increase tension, the air pump is started first. The gas generated by the air pump is delivered to the one-way valve through the rotary joint. Due to the one-way conduction characteristic of the one-way valve, the gas can only enter the first air passage 15 inside the connecting shaft 14 through the one-way valve. The gas entering the first air passage 15 is then diverted to several connected second air passages 16, and then... Air enters the airbag 7 evenly through the air holes 17 on the inner wall of the airbag 7 connected to the free end of the second air passage 16, causing the airbag 7 to gradually inflate. When the airbag 7 inflates to the preset level and its pressure on the metal sheet reaches the required tension, the air pump is turned off. The one-way valve prevents the gas in the airbag 7 from flowing back, maintaining stable air pressure inside the airbag 7. When it is necessary to reduce the tension, i.e., deflate the airbag 7, the vent valve at the other end of the fixing frame 6 is opened. The gas in the airbag 7 enters the second air passage 16 through the air holes 17, then flows to the first air passage 15, and finally exits the device through the vent valve. Once the air pressure inside the airbag 7 drops to a suitable value, the vent valve is closed, completing the tension adjustment. During the rotation of the connecting shaft 14 as the metal sheet is unwound, the rotary joint ensures that the air pump connecting pipe does not rotate with the connecting shaft 14, ensuring that the gas delivery or discharge process is not affected.

[0019] As an embodiment of this utility model, the fixing frame 6, connecting shaft 14, one-way valve, vent valve, and first air passage 15 are all coaxially arranged. During the device assembly stage, the one-way valve and vent valve are installed at both ends of the fixing frame 6 according to the coaxiality requirement, so that the central axis of the one-way valve and vent valve coincides with the central axis of the fixing frame 6. Then, the connecting shaft 14 is installed in the groove of the fixing frame 6 through bearings to ensure that the central axis of the connecting shaft 14 is consistent with the central axis of the fixing frame 6. When machining the first air passage 15 inside the connecting shaft 14, it is ensured that the central axis of the first air passage 15 coincides with the central axis of the connecting shaft 14, and the two ends of the first air passage 15 are respectively connected to the interfaces of the one-way valve and the vent valve.

[0020] As an embodiment of this utility model, the number of air holes 17 and the number of second air channels 16 are the same. During the device processing, after determining the number of second air channels 16 according to the design requirements, the same number of air holes 17 as the number of second air channels 16 are processed on the inner wall of the airbag 7. When assembling the connecting shaft 14 and the airbag 7, the free end of each second air channel 16 is aligned with the corresponding air hole 17 and connected and fixed to ensure that each second air channel 16 can form a complete gas channel with an air hole 17. When the air pump delivers gas to the first air channel 15 through the one-way valve, the gas in the first air channel 15 is diverted to each second air channel 16. Since each second air channel 16 has a corresponding air hole 17, the gas can enter the interior of the airbag 7 through all the air holes 17 at the same time, and the air intake of each air hole 17 is basically the same, so that each area of ​​the airbag 7 can expand synchronously and evenly, avoiding the situation of local bulging or depression of the airbag 7, thereby ensuring that the airbag 7 applies uniform pressure to the metal sheet and achieves stable tension.

[0021] As an embodiment of this utility model, the fixing component further includes a drive shaft 10 rotatably installed inside the rotating shaft 3 and a first motor 12 fixedly installed inside the rotating shaft 3. The output end of the first motor 12 is connected to the drive shaft 10. Four sets of protrusions 11 are equidistantly installed on the outer circumference of the drive shaft 10. Four sets of sliding grooves 13 are equidistantly opened on the outer circumference of the rotating shaft 3. Abutments 4 slide in each of the sliding grooves 13. The protrusions 11 press against the bottom surface of the abutments 4. A connecting frame 8 is installed at one end of the abutment 4 inside the rotating shaft 3. A spring 9 is connected between the connecting frame 8 and the inner wall of the rotating shaft 3. When it is necessary to fix the coil, the coil is first put on the outside of the rotating shaft 3 so that the inner circle of the coil is aligned with the abutment 4 on the outside of the rotating shaft 3. Then, the first motor 12 fixed inside the rotating shaft 3 is started. The output end of the first motor 12 drives the drive shaft 10, which is connected to it, to rotate inside the rotating shaft 3. When the drive shaft 10 rotates, the four sets of protrusions 11 rotatably installed on its outer circumference... Block 11 rotates synchronously. As the protrusion 11 rotates, it gradually contacts the bottom surface of the abutment 4 and generates a squeezing effect. Under the squeezing force of the protrusion 11, the abutment 4 slides outward along the four sets of sliding grooves 13 opened on the outside of the rotating shaft 3. The outwardly protruding part of the abutment 4 gradually contacts the inner circle of the coil and generates a squeezing force. When the abutment 4 can firmly fix the coil on the rotating shaft 3, the first motor 12 is turned off. At this time, the spring 9 between the inner end connecting frame 8 of the abutment 4 and the inner wall of the rotating shaft 3 is in a stretched state. The elastic force generated by the spring 9 can help the abutment 4 maintain the squeezing force on the coil. When it is necessary to disassemble the coil, the first motor 12 is started to reverse, and the drive shaft 10 drives the protrusion 11 to rotate in the opposite direction. The squeezing force of the protrusion 11 on the bottom surface of the abutment 4 gradually decreases. The elastic restoring force of the spring 9 pulls the connecting frame 8 to move towards the inner wall of the rotating shaft 3. The connecting frame 8 drives the abutment 4 to retract into the sliding groove 13, releasing the fixation of the coil, and the coil can be removed from the rotating shaft 3.

[0022] Specifically, the first motor 12 is an electromagnetic brake motor, and an electric slip ring is fitted on the outer side of the rotating shaft 3, so that the mover of the electric slip ring is fixedly connected to the rotating shaft 3 and electrically connected to the first motor 12.

[0023] As an embodiment of this utility model, the top surfaces of both the protrusion 11 and the abutment 4 are arc surfaces. During the processing of the protrusion 11 and the abutment 4, the top surfaces of both are processed into smooth arc surface structures. When the first motor 12 drives the drive shaft 10 and the protrusion 11 to rotate, the arc surface top surface of the protrusion 11 gradually contacts the arc surface bottom surface of the abutment 4. Due to the smoothness of the arc surface, the friction between the protrusion 11 and the abutment 4 is small when the protrusion 11 rotates, and the protrusion 11 can smoothly slide along the arc surface bottom surface of the abutment 4 and gradually apply pressure. As the protrusion 11 continues to rotate, the top surface of the protrusion 11 gradually contacts the bottom surface of the abutment 4. The pressure exerted on the abutment 4 gradually increases, and the abutment 4 slowly slides outward within the slide groove 13 to prevent it from sliding too quickly due to a sudden increase in pressure. When the top surface of the arc of the abutment 4 contacts the inner ring of the coil, the arc increases the contact area between the two, and the pressure exerted on the inner ring of the coil by the abutment 4 is evenly distributed, so that the coil is firmly fixed on the rotating shaft 3 and the inner ring of the coil will not be damaged due to excessive local pressure. When the protrusion 11 rotates in the opposite direction, the top surface of the arc of the protrusion 11 and the bottom surface of the arc of the abutment 4 gradually separate, the pressure gradually decreases, and under the action of the spring 9, the abutment 4 smoothly retracts into the slide groove 13.

[0024] As an embodiment of this utility model, the driving component further includes a driving box 2 located outside the fixed frame 1. A second motor and a reducer are installed inside the driving box 2. The output end of the second motor is connected to the input end of the reducer, and the output end of the reducer is connected to the rotating shaft 3. A heat dissipation filter is embedded on the surface of the driving box 2. When the rotating shaft 3 needs to be driven to rotate for unwinding, the power supply to the second motor is first turned on. After the second motor starts, it outputs high-speed power. The output end of the second motor transmits the power to the input end of the reducer, which is connected to it. The gear set inside the reducer reduces the high speed input from the second motor while increasing the output torque. Then, the processed stable low-speed power is transmitted through the output end of the reducer. The force is transmitted to the rotating shaft 3; under the action of the reducer's output power, the rotating shaft 3 drives the outer fixed roll to rotate synchronously at a suitable speed, realizing the stable unwinding of the metal sheet; during the operation of the second motor and reducer, heat is generated. The hot air inside the drive box 2 exchanges with the cold air outside through the heat dissipation filter embedded on the surface to achieve heat dissipation. At the same time, the heat dissipation filter can prevent dust in the outside air from entering the drive box 2, avoiding dust adhering to the surface of the second motor and reducer and affecting heat dissipation, ensuring that the second motor and reducer always operate within the normal operating temperature range, and continuously providing stable power to the rotating shaft 3; when unwinding is completed or it is necessary to pause unwinding, the second motor is turned off, the rotating shaft 3 stops rotating, and the unwinding process stops.

[0025] It should be noted that all standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a control cabinet. The control circuit can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Furthermore, since this application is mainly used to protect mechanical devices, this application will not explain the control method and circuit connection in detail.

Claims

1. A metal sheet roll unwinding and tensioning device, characterized in that, The device includes a fixed frame (1), which is semi-open. A rotating shaft (3) is rotatably connected to the side of the open part of the fixed frame (1). The rotating shaft (3) has a fixing member inside, which is used to fix the roll material to the outside of the rotating shaft (3). A driving member is provided on the outside of the fixed frame (1), which is used to drive the rotating shaft (3) to rotate. A fixed frame (6) is provided inside the closed part of the fixed frame (1). An electric telescopic rod (5) is installed on the top surface of the fixed frame (1). The telescopic end of the electric telescopic rod (5) is connected to the fixed frame (6). The fixed frame (6) is U-shaped. A connecting shaft (14) is rotatably connected to the groove of the fixed frame (6) through a bearing. An airbag (7) is fixedly installed on the outside of the connecting shaft (14). A venting member is provided inside the connecting shaft (14), which delivers an external air source to the airbag (7).

2. The metal sheet roll unwinding and tensioning device according to claim 1, characterized in that, The ventilation component includes a one-way valve and a vent valve installed at both ends of the fixed frame (6). The connecting shaft (14) has a first air passage (15) and several second air passages (16). The two ends of the first air passage (15) are connected to the one-way valve and the vent valve respectively. The one-way valve is connected to the air pump through a rotary joint. Several second air passages (16) are connected to the first air passage (15). The inner wall of the airbag (7) has several air holes (17). The free end of the second air passage (16) is connected to the air hole (17).

3. The metal sheet roll unwinding and tensioning device according to claim 2, characterized in that, The fixed frame (6), connecting shaft (14), one-way valve, vent valve, and first air passage (15) are all arranged on the same axis.

4. The metal sheet roll unwinding and tensioning device according to claim 2, characterized in that, The number of pores (17) and the number of second air passages (16) are the same.

5. The unwinding and tensioning device for metal sheet rolls according to claim 1, characterized in that, The fixing component includes a drive shaft (10) rotatably installed inside the rotating shaft (3) and a first motor (12) fixedly installed inside the rotating shaft (3). The output end of the first motor (12) is connected to the drive shaft (10) in a transmission connection. Four sets of protrusions (11) are installed at equal intervals on the outer circumference of the drive shaft (10). Four sets of sliding grooves (13) are opened at equal intervals on the outer circumference of the rotating shaft (3). Abutment blocks (4) slide in each of the sliding grooves (13). The protrusions (11) press against the bottom surface of the abutment blocks (4). A connecting frame (8) is installed at one end of the abutment blocks (4) located inside the rotating shaft (3). A spring (9) is connected between the connecting frame (8) and the inner wall of the rotating shaft (3).

6. The unwinding and tensioning device for metal sheet rolls according to claim 5, characterized in that, The top surfaces of both the protrusion (11) and the abutment (4) are curved surfaces.

7. The unwinding and tensioning device for metal sheet rolls according to claim 1, characterized in that, The driving component includes a driving box (2) located outside the fixed frame (1). A second motor and a reducer are installed inside the driving box (2). The output end of the second motor and the input end of the reducer are connected in a transmission connection. The output end of the reducer is connected in a transmission connection with the rotating shaft (3). A heat dissipation filter is embedded on the surface of the driving box (2).

Images