Air cushion furnace strip conveying device

Abstract

The invention belongs to the technical field of strip conveying, and discloses an air cushion furnace strip conveying device which comprises conveying modules, each conveying module comprises two triangular plates, each triangular plate is provided with a belt, and the middle of each belt is bent towards the centroid of the corresponding triangular plate; a rectangular block is hinged to the outer side of the triangular plate, a hinge shaft of the rectangular block and the triangular plate is a hollow shaft, a driving roller is arranged in the hollow shaft, motors are connected to the two ends of the driving roller, a visual sensor is arranged on the side wall of the air cushion furnace, and a limiting module is arranged between the hollow shaft and the rectangular block and enables the hollow shaft to only rotate by 120 degrees relative to the rectangular block each time. After the visual sensor detects the splicing position of the strip, the power supply of the motor is cut off, and meanwhile, the limiting module cancels the limiting effect; after the conveying module rotates by 120 degrees, the power supply of the motor is switched on, and the limiting module restores the limiting effect on the hollow shaft; the problem that a coating on the surface of a pinch roll in an existing conveying device is prone to being abraded by the strip splicing position is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of strip conveying, and particularly relates to a strip conveying device for a cushion furnace. Background Art

[0002] A cushion furnace supports a strip by forming an air cushion under the strip through high-pressure gas, so it has significant advantages in the processing of high-gloss aluminum strips and copper strips. However, there are also certain limitations. For example, pinch rolls need to be arranged at the front end of the cushion furnace to ensure that the strip enters the cushion furnace stably and smoothly. When the existing pinch rolls process the same coil of strip, the strip can be conveyed at a stable speed and tension under the action of a driving motor and a tension control module. When splicing two coils of strip, due to reasons such as sudden thickness change and irregular shape at the splicing position, the polyurethane coating on the pinch rolls is easily worn, or the punching effect of the seam welder is poor, and burrs even appear at the splicing position. Therefore, the coating on the rolls at the splicing position is significantly threatened by wear. The existing solutions mainly reduce the coating wear by polishing the splicing joint to make it smooth or reducing the pressure setting of the pinch rolls and reducing the conveying speed, etc. However, these methods still cannot avoid the contact between the splicing position and the roll surface coating, and reducing the conveying speed means a reduction in production efficiency, which does not conform to the enterprise development concept. Therefore, at present, a new conveying device is needed to avoid the situation that the splicing position of the strip easily causes wear to the roll surface coating. Summary of the Invention

[0003] The purpose of the present invention is to provide a strip conveying device for a cushion furnace to solve the problem that the coating on the surface of the pinch rolls in the existing conveying device is easily worn by the splicing position of the strip.

[0004] To achieve the above purpose, the present invention adopts the following technical scheme: A strip conveying device for a cushion furnace includes a cushion furnace. Two symmetrically arranged upper and lower conveying modules are provided on the side wall at the inlet end of the cushion furnace. Each conveying module includes two triangular plates. Three round rollers are arranged between the two triangular plates. A belt is wrapped outside the three round rollers. A constraint module is provided outside the belt, and the constraint module can make the part of the belt that does not fit the round rollers bend towards the centroid of the triangular plate. A rectangular block is hinged outside the triangular plate. An electric push rod is fixed at the upper end of the rectangular block, and the other end of the electric push rod is fixed to the cushion furnace. The hinge axis of the rectangular block and the triangular plate is a hollow shaft, and the hollow shaft is fixedly connected to the triangular plate. A driving roller is arranged inside the hollow shaft. The middle part of the driving roller is in contact with the belt, and the other end of the driving roller passes through the hollow shaft on the other side. Motors are connected to both ends of the driving roller. A vision sensor is provided on the side wall of the air-cushion furnace. A limiting module is provided between the hollow shaft and the rectangular block. The limiting module enables the hollow shaft to rotate relative to the rectangular block by only 120 degrees each time. After the vision sensor detects the splicing point of the strip, the power supply of the motor is disconnected, and at the same time, the limiting effect of the limiting module is cancelled; after the conveying module rotates 120 degrees, the power supply of the motor is turned on and the limiting module restores the limiting effect on the hollow shaft.

[0005] As a further description of the above technical solution: Both ends of the described round roller are connected to the included angle of the triangular plate through bearings. The axes of the three round rollers are parallel to each other. The distance between the axis of the round roller and the sharp corner of the triangular plate is less than the diameter of the round roller. Thus, the sharp corner of the triangular plate is located within the axial projection area of the round roller. When the conveying module rotates, only the belt contacts the strip, and even if the strip shifts, it does not interfere with the triangular plate; and the rotational resistance of the three round rollers is greater than the rotational resistance of the two hollow shafts, making the resistance of the belt's self-rotation greater than the resistance of the transmission module's revolution.

[0006] As a further description of the above technical solution: The described constraint module includes thin rollers. There are two thin rollers. Both ends of the two thin rollers are connected to the triangular plates on both sides through bearings. And the distance between the axis of the thin roller and the side of the triangular plate is greater than the diameter of the thin roller. One thin roller or a driving roller is provided on the outer side of the belt between every two round rollers. Thus, the middle part of the belt is bent towards the centroid of the triangular plate.

[0007] As a further description of the above technical solution: The axis of the described hollow shaft passes through the centroid of the triangular plate, and a through hole is opened on the triangular plate. The diameter of the through hole is equal to the inner diameter of the hollow shaft. The described driving roller is located inside the hollow shaft and the through hole; a universal joint is provided between the driving roller and the motor. Both ends of the universal joint are connected to the driving roller or the motor through splines; thus, the driving roller is driven to rotate by the motor, and the driving roller drives the belt to rotate; a one-way bearing is provided between the driving roller and the universal joint. The one-way bearing enables the universal joint to drive the strip to move through the driving roller and the belt, while the strip cannot drive the universal joint to rotate through the belt and the driving roller.

[0008] As a further description of the above technical solution: The described limiting module includes sunk grooves. There are three sunk grooves, which are circumferentially distributed on the outer side wall of the hollow shaft. A through groove is opened on the side wall of the rectangular block. A slider is provided in the through groove. One end of the slider extends out of the through groove and is fixed with an iron block. A tension spring is provided between the iron block and the rectangular block. The other end of the slider can be embedded in the sunk groove under the action of the tension spring; thus, the rotating module can only rotate 120 degrees each time; a housing is fixed outside the through groove. The iron block is located inside the cavity of the housing. An electromagnet is fixed on the side of the cavity of the housing away from the iron block. When the electromagnet is energized, it can adsorb the iron block to make the slider disengage from the sunk groove; thus, the limiting effect of the limiting module is cancelled.

[0009] As a further description of the above technical solution: The visual sensor, the electromagnet and the motor are all connected to the controller through control loop wires. The controller uses an STM32 single-chip microcomputer to control the power switches of the electromagnet and the motor after processing the induction signals of the visual sensor.

[0010] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: (1) In the present invention, the two pressure rollers in the existing pinch rolls are changed to two conveying modules composed of three round rollers and a belt. The belt in the conveying module bends inward under the action of the constraint module, so that when the splicing joint of the two coils of strip is conveyed to the lower part of the device, the conveying module can rotate around the public axis under the pulling of the strip, and the splicing joint can pass through without contact from below the conveying module by "hiding" in the bent position of the belt, avoiding the wear of the polyurethane belt by the rough surface of the splicing joint and prolonging the service life of the polyurethane belt.

[0011] (2) When the existing pinch rolls encounter a splicing joint, the splicing joint first contacts the two pressure rollers. Since the roll gap between the two pressure rollers is smaller than the thickness of the splicing joint, the splicing joint is squeezed by the pinch rolls, and then the pressure control device is triggered to actively increase the roll gap, so that the splicing joint can pass through the pinch rolls smoothly. During this process, the tension of the rear strip suddenly becomes larger, and the risk of being broken is high; while when the present invention encounters a splicing joint, it can actively cut off the power supply of the motor, and the transmission module rotates around the public axis under the pulling of the strip. During the whole process, the splicing joint is not squeezed by the round rollers, and at the same time, the pressure control system always keeps the pressure constant, and the change range of the tension of the rear strip is small, and the risk of being broken is lower.

[0012] (3) In the present invention, the polyurethane coating coated on the outer side of the existing pressure roller is changed to a belt made of polyurethane material. Not only does it achieve the effect of non-contact conveying of the splicing joint through the bending shape, but the wear speed during use is slower. Moreover, after fatigue aging, only the belt needs to be replaced, and there is no need to replace the pressure roller or re-coat the pressure roller, which not only reduces the replacement cost but also improves the replacement speed. Description of the Drawings

[0013] Figure 1 It is a state diagram when the present invention is in use; Figure 2 It is a state diagram of two conveying modules when the present invention does not detect a splicing joint; Figure 3 It is a state diagram when the splicing joint of the present invention passes through between two conveying modules; Figure 4 It is a structural diagram of the conveying module of the present invention; Figure 5 It is a cross-sectional view of the conveying module of the present invention in the axial direction of the round shaft; Figure 6 This is a schematic structural diagram of the limit module of the present invention.

[0014] Legend: 1. Air cushion furnace; 2. Conveying module; 3. Triangular plate; 4. Round roller; 5. Belt; 6. Rectangular block; 7. Electric push rod; 8. Hollow shaft; 9. Driving roller; 10. Motor; 11. Vision sensor; 12. Fine roller; 13. Universal joint; 14. Sunk groove; 15. Through groove; 16. Slide block; 17. Iron block; 18. Tension spring; 19. Shell; 20. Electromagnet. Specific embodiments

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0016] Please refer to Figures 1-6 , the present invention provides a technical solution for a strip conveying device of an air cushion furnace 1: A strip conveying device of an air cushion furnace 1 includes an air cushion furnace 1. Two symmetrically arranged conveying modules 2 are provided on the side wall at the inlet end of the air cushion furnace 1. Each conveying module 2 includes two triangular plates 3. Three round rollers 4 are provided between the two triangular plates 3. Both ends of the round rollers 4 are connected to the included angle of the triangular plates 3 through bearings. The axes of the three round rollers 4 are parallel to each other. The distance between the axis of the round roller 4 and the sharp angle of the triangular plate 3 is less than the diameter of the round roller 4, so as to realize that the sharp angle of the triangular plate 3 is located within the axial projection area of the round roller 4; A belt 5 is wrapped outside the three round rollers 4. A constraint module is provided outside the belt 5. The constraint module includes fine rollers 12. There are two fine rollers 12. Both ends of the two fine rollers 12 are connected to the side triangular plates 3 through bearings, and the distance between the axis of the fine roller 12 and the side of the triangular plate 3 is greater than the diameter of the fine roller 12. A fine roller 12 or a driving roller 9 is provided outside the belt 5 between every two round rollers 4, so as to realize that the middle part of the belt 5 bends towards the centroid of the triangular plate 3; When the conveying module 2 rotates, only the belt 5 contacts the strip. Even if the strip deviates, it will not interfere with the triangular plate 3. And the rotational resistance of the three round rollers 4 is greater than the rotational resistance of the two hollow shafts 8, so that the self-rotation resistance of the belt 5 is greater than the revolution resistance of the transmission module; A rectangular block 6 is hinged to the outside of the triangular plate 3. An electric push rod 7 is fixed to the upper end of the rectangular block 6, and the other end of the electric push rod 7 is fixed to the air cushion furnace 1. The hinge shaft of the rectangular block 6 and the triangular plate 3 is a hollow shaft 8. The hollow shaft 8 is fixedly connected to the triangular plate 3. The axis of the hollow shaft 8 passes through the centroid of the triangular plate 3, and a through hole is opened on the triangular plate 3. The diameter of the through hole is equal to the inner diameter of the hollow shaft 8. A driving roller 9 is arranged inside the hollow shaft 8. The middle part of the driving roller 9 is in contact with the belt 5. The other end of the driving roller 9 passes out of the hollow shaft 8 on the other side. Both ends of the driving roller 9 are connected with motors 10. A universal joint 13 is arranged between the driving roller 9 and the motors 10. Both ends of the universal joint 13 are connected to the driving roller 9 or the motors 10 through splines; thus, the driving roller 9 is driven to rotate by the motors 10, and the driving roller 9 drives the belt 5 to rotate; a one-way bearing is arranged between the driving roller 9 and the universal joint 13, and the one-way bearing enables the universal joint 13 to drive the strip to move through the driving roller 9 and the belt 5, while the strip cannot drive the universal joint 13 to rotate through the belt 5 and the driving roller 9; A vision sensor 11 is arranged on the side wall of the air cushion furnace 1. A limiting module is arranged between the hollow shaft 8 and the rectangular block 6. The limiting module includes a sunk groove 14. There are three sunk grooves 14, and the three sunk grooves 14 are circumferentially distributed on the outer side wall of the hollow shaft 8. A through groove 15 is opened on the side wall of the rectangular block 6. A slider 16 is arranged in the through groove 15. One end of the slider 16 extends out of the through groove 15 and is fixed with an iron block 17. A tension spring 18 is arranged between the iron block 17 and the rectangular block 6. The other end of the slider 16 can be embedded into the sunk groove 14 under the action of the tension spring 18; thus, the rotation module can only rotate 120 degrees each time; a housing 19 is fixed outside the through groove 15. The iron block 17 is located inside the cavity of the housing 19. An electromagnet 20 is fixed on one side of the cavity of the housing 19 away from the iron block 17. When the electromagnet 20 is energized, it can adsorb the iron block 17 to make the slider 16 break out of the sunk groove 14. Thus, when the vision sensor 11 detects the splicing position of the strip, the power supply of the motors 10 is cut off, and at the same time, the limiting effect of the limiting module is cancelled; after the conveying module 2 rotates 120 degrees, the power supply of the motors 10 is switched on and the limiting module restores the limiting effect on the hollow shaft 8.

[0017] The vision sensor 11, the electromagnet 20 and the motors 10 are all connected to the controller through control loop wires. The controller uses an STM32 single-chip microcomputer, which is used to control the power switches of the electromagnet 20 and the motors 10 after processing the induction signals of the vision sensor 11.

[0018] Working principle: When this device is in use, the electric push rod 7 is connected to the pressure control system of the existing pinch roll. When the tension on the strip fluctuates, the pressure control system can change the length of the electric push rod 7, and then by changing the pressure of the two conveying modules 2 on the strip, the control of the strip tension is realized; When processing the strip in the same coil, only one round roller 4 of each of the two conveying modules 2 supports the belt 5 to be in extrusion contact with the strip. One end of the slider 16 is located in the sunk groove 14. The hollow shaft 8 is relatively fixed to the rectangular block 6. The triangular plate 3 does not rotate. The belt 5 is driven to rotate by the motor 10 under the support of the round roller 4, the thin roller 12 and the driving roller 9, and the linear velocity of the belt 5 is always equal to the linear velocity of the strip. During the working process, the pressure control system controls the conveying speed and tension of the strip through the two conveying modules 2. When the processing of the previous coil of strip is completed, the end of the strip is spliced with the head end of the next coil of strip under the treatment of the seam welder. Subsequently, the splicing part is conveyed to the front of the device. When the visual sensor 11 detects the splicing part, the splicing part is exactly located under a round roller 4 where the unsupported belt 5 is in extrusion contact with the strip. At this time, the visual sensor 11 transmits the detection signal to the controller, and the controller gives the electromagnet 20 a set-duration energized circuit and gives the motor 10 a set-duration de-energized circuit. After the electromagnet 20 is energized, it adsorbs the iron block 17 to disengage the slider 16 from the sunk groove 14, and the limiting effect of the limiting module is cancelled. At the same time, after the motor 10 stops rotating, the strip still moves backward under the action of other transmission rollers. The friction between the belt 5 made of polyurethane and the strip and the round roller 4 is relatively large. Therefore, when the strip moves backward, there is a tendency to drive the belt 5 to continue to rotate. Also, since the rotational resistance of the three round rollers 4 is greater than the rotational resistance of the two hollow shafts 8, the strip directly drives the transmission module to revolve. When the pressure between the belt 5 and the strip becomes smaller and the tension fluctuates during the revolution of the transmission module, the pressure control system will extend the electric push rod 7, thereby continuously compensating the pressure between the belt 5 and the strip to keep the tension on the strip relatively stable. At the same time, the stable pressure control makes the belt 5 and the strip not have sliding friction until the strip drives the transmission module to revolve until there are two round rollers 4 supporting the belt 5 to be in extrusion contact with the strip. At this time, since the middle part of the belt 5 bends towards the centroid of the triangular plate 3 and the strip has always had no sliding friction with the belt 5, the splicing part is exactly located under the bent part of the belt 5 at this time, and the splicing part does not contact the belt 5, avoiding the edges, corners and burrs of the splicing part from wearing the belt 5. As the strip continues to move backward, the strip gives an obliquely upward force to the rectangular block 6 through the belt 5 and the round roller 4, making the sensed pressure of the pressure control system increase, and the electric push rod 7 shortens. The transmission module continues to revolve until the rotation angle of the transfer module reaches 120 degrees. At this time, the energized circuit of the electromagnet 20 has been disconnected, so the slider 16 is embedded in the sunk groove 14 again under the action of the tension spring 18, fixing the hollow shaft 8, and the revolving module stops rotating. At the same time, the circuit of the motor 10 is reconnected, and the motor 10 continues to drive the belt 5 to rotate through the universal joint 13 and the driving roller 9. The device returns to the state before detecting the splicing part, and the splicing part has passed under the transmission module and moves into the air cushion furnace 1.

[0019] In addition, the vision sensor and the controller using the STM32 single-chip microcomputer both belong to mature existing technologies, and there are various options and implementation methods that can meet the functional requirements of this device. However, the protection scope of the present invention is not limited to the described embodiments. Those skilled in the art of this technology, within the technical scope disclosed by the present invention, should cover any equivalent substitution or change made according to the technical solution and inventive concept of the present invention within the protection scope of the present invention.

Claims

1. An air-cushion furnace strip conveying device, comprising an air-cushion furnace (1), characterized in that, On the side wall of the inlet end of the air cushion furnace (1), there are two symmetrically arranged conveying modules (2) up and down. Each conveying module (2) includes two triangular plates (3). Between the two triangular plates (3), there are three round rollers (4). A belt (5) is wrapped outside the three round rollers (4). A constraint module is arranged outside the belt (5), and the constraint module can bend the part of the belt (5) that does not fit with the round roller (4) towards the centroid of the triangular plate (3); A rectangular block (6) is hinged outside the triangular plate (3). An electric push rod (7) is fixed at the upper end of the rectangular block (6). The other end of the electric push rod (7) is fixed to the air cushion furnace (1). The hinge shaft of the rectangular block (6) and the triangular plate (3) is a hollow shaft (8). The hollow shaft (8) is fixedly connected with the triangular plate (3). A driving roller (9) is arranged inside the hollow shaft (8). The middle part of the driving roller (9) is in contact with the belt (5). The other end of the driving roller (9) passes out from the hollow shaft (8) on the other side. Motors (10) are connected to both ends of the driving roller (9); A visual sensor (11) is arranged on the side wall of the air cushion furnace (1). A limit module is arranged between the hollow shaft (8) and the rectangular block (6). The limit module enables the hollow shaft (8) to rotate only 120 degrees relative to the rectangular block (6) each time. After the visual sensor (11) detects the splicing position of the strip, the power supply of the motor (10) is cut off, and at the same time, the limit module cancels the limiting effect; After the conveying module (2) rotates 120 degrees, the power supply of the motor (10) is turned on and the limit module restores the limiting effect on the hollow shaft (8).

2. The device according to claim 1, characterized in that, Both ends of the round roller (4) are connected to the included angle of the triangular plate (3) through bearings. The axes of the three round rollers (4) are parallel to each other. The distance between the axis of the round roller (4) and the sharp corner of the triangular plate (3) is less than the diameter of the round roller (4); The rotational resistance of the three round rollers (4) is greater than the rotational resistance of the two hollow shafts (8).

3. The device according to claim 1, characterized in that, The constraint module includes thin rollers (12). There are two thin rollers (12). Both ends of the two thin rollers (12) are connected to the triangular plates (3) on both sides through bearings. And the distance between the axis of the thin roller (12) and the side of the triangular plate (3) is greater than the diameter of the thin roller (12). A thin roller (12) or a driving roller (9) is arranged outside the belt (5) between every two round rollers (4).

4. The device according to claim 1, wherein The axis of the hollow shaft (8) passes through the centroid of the triangular plate (3), and a through hole is opened on the triangular plate (3). The diameter of the through hole is equal to the inner diameter of the hollow shaft (8). The driving roller (9) is located inside the hollow shaft (8) and the through hole; A universal joint (13) is arranged between the driving roller (9) and the motor (10). Both ends of the universal joint (13) are connected to the driving roller (9) or the motor (10) through splines; A one-way bearing is arranged between the driving roller (9) and the universal joint (13). The one-way bearing enables the universal joint (13) to drive the strip to move through the driving roller (9) and the belt (5), while the strip cannot drive the universal joint (13) to rotate through the belt (5) and the driving roller (9).

5. The device according to claim 1, characterized in that, The limit module includes a sink groove (14), three sink grooves (14) are provided, and the three sink grooves (14) are evenly distributed on the outer wall of the hollow shaft (8). A through groove (15) is opened on the side wall of the rectangular block (6), and a slider (16) is provided in the through groove (15). One end of the slider (16) extends out of the through groove (15) and is fixed with an iron block (17). A tension spring (18) is provided between the iron block (17) and the rectangular block (6). The other end of the slider (16) can be embedded in the sink groove (14) under the action of the tension spring (18); a shell (19) is fixed on the outside of the through groove (15), and the iron block (17) is located in the inner cavity of the shell (19). An electromagnet (20) is fixed on the side of the inner cavity of the shell (19) away from the iron block (17). When the electromagnet (20) is energized, it can adsorb the iron block (17) to make the slider (16) fall out of the sink groove (14).

6. The device according to claim 5, wherein The visual sensor (11), electromagnet (20) and motor (10) are all connected to a controller via control loop wires. The controller uses an STM32 single-chip microcomputer and is used to control the power switches of the electromagnet (20) and motor (10) after processing the sensing signal of the visual sensor (11).

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