Paper blocking system

Abstract

The utility model discloses a paper blocking system, relates to the technical field of papermaking, and aims to solve the problem that when a small-specification paper roll is blocked by a paper blocking device, the rolling small-specification paper roll collides with the paper blocking device, and the paper roll is deformed. The paper blocking system comprises a pneumatic paper blocking device and a gas transmission assembly. The gas transmission assembly comprises a pressure regulating device and a gas transmission pipeline, the pressure regulating device is arranged on the gas transmission pipeline, and the gas transmission pipeline is connected with an inlet of the pneumatic paper stopper; the paper blocking system further comprises a control device, and the control device is electrically connected with the voltage regulating device. The paper blocking system disclosed by the utility model is used for blocking paper.

Description

Technical Field

[0001] The utility model relates to the technical field of papermaking, in particular to a paper stopping system. Background Art

[0002] During the unloading process of the rewinder, a paper stopper is often needed to stop the paper rolls kicked out from the rewinder. The paper rolls include not only large-sized paper rolls weighing 4 tons, a width of 2328 mm, and a diameter of 1751 mm, but also small-sized paper rolls weighing 0.5 tons, a width of 625 mm, and a diameter of 800 mm. The large difference in weight between these two types of paper rolls results in a large difference in the kinetic energy of the two types of paper rolls when rolling. In order to be able to stop the large-sized paper rolls, the air pressure of the paper stopper is often set to 0.48 MPa. However, a paper stopper with such a pressure cannot play a buffering role for small-sized paper rolls. When the paper stopper stops the small-sized paper rolls, the rolling small-sized paper rolls will hit the paper stopper, causing the paper rolls to deform. Summary of the Invention

[0003] The purpose of the utility model is to provide a paper blocking system that can block paper rolls of different specifications and maintain the original shape of the paper rolls.

[0004] The utility model provides a paper blocking system, comprising:

[0005] Pneumatic paper stopper and gas transmission assembly; the gas transmission assembly includes a pressure regulating device and a gas transmission pipeline, the pressure regulating device is arranged on the gas transmission pipeline, and the gas transmission pipeline is connected to the inlet of the pneumatic paper stopper; the paper stopping system also includes a control device, and the control device is electrically connected to the pressure regulating device.

[0006] Compared with the prior art, the paper stopper system provided by the present invention includes a pneumatic paper stopper and a gas transmission component, wherein the gas transmission component includes a pressure regulating device and a gas transmission pipeline. The gas transmission pipeline is connected to the inlet of the pneumatic paper stopper, and the pressure regulating device is provided on the gas transmission pipeline. Therefore, in the process of using the gas transmission pipeline to ventilate the pneumatic paper stopper, the pressure regulating device provided on the gas transmission pipeline can adjust the air pressure in the gas transmission pipeline so that the pneumatic paper stopper can stop the paper roll kicked out of the rewinder from continuing to roll under the drive of the gas, and can also play a buffering role on the paper roll, thereby maintaining the original shape of the paper roll while blocking the paper roll, reducing the probability of deformation of the paper roll after contact with the pneumatic paper stopper due to the excessive air pressure of the pneumatic paper stopper having no buffering effect on the paper roll. In addition, the paper stopping system provided by the present invention also includes a control device, which is electrically connected to the pressure regulating device. Therefore, in the process of the pneumatic paper stopper stopping the paper, the control device can adjust the air pressure in the gas transmission pipeline by controlling the pressure regulating device. This not only enables the pneumatic paper stopper to play a buffering role for paper rolls of different specifications under the drive of gas, but also ensures that the paper rolls stopped by the pneumatic paper stopper can maintain their original shape, thereby improving the yield of the paper rolls and reducing the cost of processing deformed paper rolls and the chance of customer complaints.

[0007] In addition, in the prior art, the air pressure of the pneumatic paper stopper is often only set to a pressure that can block large-sized paper rolls. The paper stopper system provided by the present invention can use a pressure regulating device to adjust the air pressure entering the pneumatic paper stopper, so that the pneumatic paper stopper can block paper rolls of different specifications, thereby improving gas utilization and reducing waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0009] Figure 1 A first schematic diagram of a paper stop system provided by an embodiment of the present utility model is shown;

[0010] Figure 2 A second schematic diagram of the paper stop system provided by an embodiment of the present invention is shown;

[0011] Figure 3 A schematic diagram showing the internal structure of a base in a paper blocking system provided by an embodiment of the present invention.

[0012] Reference numerals:

[0013] 100-pneumatic paper stopper; 101-base; 102-pneumatic drive device; 1021-cylinder; 10211-first limiting structure; 10212-second limiting structure; 1022-piston; 1023-piston rod; 103-paper stopper structure; 1031-paper stopper surface; 104-elastic buffer pad; 105-rotating shaft; 106-elastic limiting member; 200-gas transmission component; 201-pressure regulating device; 2011-controllable valve; 202-gas transmission pipeline; 300-control device; 301-digital-to-analog converter; 302-analog comparison circuit; 303-analog-to-digital conversion circuit; 400-weighing sensor. DETAILED DESCRIPTION

[0014] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0015] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined. "Several" means one or more, unless otherwise specifically defined.

[0017] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0018] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0019] As a post-processing stage in a paper machine, the rewinder processes the paper produced. Large rolls are rewound into smaller rolls of various sizes according to customer specifications. These rolls are then fed to the next stage for slitting or delivery to customers. During the unloading process, a paper stopper is often used to catch the paper rolls ejected from the rewinder. These rolls include large rolls weighing up to 4 tons, with a width of 2,328 mm and a diameter of 1,751 mm, as well as smaller rolls weighing 0.5 tons, with a width of 625 mm and a diameter of 800 mm. The weight difference of 3.5 tons between these two rolls results in a significant difference in kinetic energy during rolling. To catch the large rolls, the paper stopper's air pressure is often set to 0.48 MPa. However, this pressure is too high for the smaller rolls, and the stopper, with this pressure, cannot cushion the smaller rolls. Consequently, the smaller rolls, when impacted by the stopper, can deform.

[0020] In view of the above problems, the present invention provides a paper blocking system that can block paper rolls of different specifications and maintain the original shape of the paper rolls. Figure 1 FIG. 1 shows a first schematic diagram of the paper stop system provided in this embodiment. Figure 1 As shown, the paper stopper system includes: a pneumatic paper stopper 100 and a gas transmission component 200, wherein the gas transmission component 200 includes a pressure regulating device 201 and a gas transmission pipeline 202. The pressure regulating device 201 is provided on the gas transmission pipeline 202, and the gas transmission pipeline 202 is connected to the inlet of the pneumatic paper stopper 100. Figure 2 A second schematic diagram of the paper stop system provided by an embodiment of the present invention is shown. Figure 2 As shown, the paper stopper system provided in this embodiment further includes a control device 300, which is electrically connected to the pressure regulating device 201. It should be understood that in actual applications, the paper stopper system may include multiple pneumatic paper stoppers, which can be adjusted according to actual conditions and are not limited here.

[0021] It is understandable that if Figure 1 and Figure 2As shown, during the process of ventilating the pneumatic paper stopper 100 via the gas transmission pipe 202, the pressure regulating device 201 provided on the gas transmission pipe 202 can regulate the air pressure within the gas transmission pipe 202, so that the pneumatic paper stopper 100, driven by the gas, can act as a buffer for the paper roll ejected from the rewinder. This, while blocking the paper roll, maintains the original shape of the paper roll, reducing the probability of the paper roll deforming upon contact with the pneumatic paper stopper 100 due to excessive air pressure in the pneumatic paper stopper 100 failing to provide a buffering effect on the paper roll. In other words, if the air pressure within the pneumatic paper stopper is a buffering pressure suitable for the size of the paper roll, when the rolling paper roll hits the pneumatic paper stopper, the paper roll will exert a force on the pneumatic paper stopper. Under this force, the preset paper roll blocking angle of the pneumatic paper stopper (simplified as the preset paper blocking angle) will first change, and then return to the preset paper blocking angle after buffering, thereby achieving the purpose of buffering the paper roll.

[0022] In addition, the control device 300 in the paper stopper system provided by the present invention is electrically connected to the pressure regulating device 201. Therefore, if the paper roll ejected from the rewinder is a large-sized paper roll, the control device 300 can control the pressure regulating device 201 to adjust the air pressure within the gas transmission pipe 202 to a pressure suitable for the passage of a large-sized paper roll. Subsequently, gas is passed along the gas transmission pipe 202 into the pneumatic paper stopper 100. When the rolling large-sized paper roll contacts the pneumatic paper stopper 100, the pneumatic paper stopper 100 not only prevents the paper roll from continuing to roll but also acts as a buffer for the large-sized paper roll, ensuring that the paper roll maintains its original shape. If the paper roll ejected from the rewinder is a small-sized paper roll, the control device 300 can control the pressure regulating device 201 to adjust the air pressure within the gas transmission pipe 202 to a pressure suitable for the passage of a small-sized paper roll. Subsequently, gas is passed along the gas transmission pipe 202 into the pneumatic paper stopper 100. When a rolling small-sized paper roll contacts the pneumatic paper stopper 100, it not only prevents the paper roll from continuing to roll, but the air pressure within the pneumatic paper stopper 100 also acts as a buffer for the small-sized paper roll, reducing the chance of the paper roll coming into direct contact with the pneumatic paper stopper 100 due to excessive air pressure within the pneumatic paper stopper 100. This ensures that the paper roll maintains its original shape, reduces the chance of deformation, improves the yield rate of the paper roll, reduces the cost of handling deformed paper rolls and the chance of customer complaints, and thus ensures that the paper roll can be smoothly fed into the next step. For example: cutting the above-mentioned paper roll into sheets. Another example: delivering the above-mentioned paper roll to a customer. It should be understood that the preset paper stop angle provided by the present invention can be adjusted according to actual conditions and is not limited here.

[0023] Furthermore, in the prior art, the air pressure of the pneumatic paper stopper 100 is often set only to a pressure sufficient to stop large-sized paper rolls. The paper stopper system provided by the present invention utilizes a pressure regulating device 201 to adjust the air pressure entering the pneumatic paper stopper 100, enabling the pneumatic paper stopper 100 to stop paper rolls of varying sizes, thereby improving gas utilization and reducing waste. It should be understood that the dimensions of the large-sized paper rolls mentioned in the exemplary embodiments of the present disclosure are not limited to those weighing up to 4 tons, with a width of up to 2328 mm, and a diameter of up to 1751 mm, and the dimensions of the small-sized paper rolls are not limited to those weighing up to 0.5 tons, with a width of up to 625 mm, and a diameter of up to 800 mm. The specific dimensions can be adjusted based on actual conditions and are not limited here.

[0024] As a possible implementation, Figure 3 A schematic diagram showing the internal structure of the base in the paper blocking system provided by the embodiment of the present invention is shown. Figure 1 and Figure 3 As shown, the pneumatic paper stopper 100 in the exemplary embodiment of the present disclosure includes a base 101, a pneumatic drive device 102, and a rotatable paper stopper structure 103 disposed on the base 101. The pneumatic drive device 102 is connected to the paper stopper structure 103, and a gas transmission pipe 202 is in communication with the pneumatic cavity of the pneumatic drive device 102. Therefore, gas can flow into the pneumatic cavity of the pneumatic drive device 102 through the gas transmission pipe 202. Driven by the pneumatic drive device 102, the connected paper stopper structure 103 rotates on the base 101. When the rotation angle of the paper stopper structure 103 relative to the base 101 reaches the paper stop angle, the paper stopper structure 103 can stop the paper roll kicked out of the rewinder.

[0025] For example, Figure 1 and Figure 3 As shown, the pneumatic drive device 102 in the exemplary embodiment of the present disclosure includes a cylinder 1021 and a piston 1022 disposed within the cylinder 1021. The piston rod 1023 of the piston 1022 is connected to the paper stop structure 103. Therefore, when gas is introduced into the cylinder 1021 of the pneumatic drive device 102 via the gas transmission pipeline 202, the gas pressure pushes the piston 1022 along the axial direction of the cylinder 1021. At this time, the piston rod 1023 can push the paper stop structure 103 to rotate on the base. When the rotation angle between the paper stop structure 103 and the base 101 reaches a predetermined paper stop angle, the paper stop structure 103 can block the paper roll kicked out of the rewinder.

[0026] It is understood that the cylinder 1021 should also have an air inlet, which is located near the bottom of the base 101. If the air pressure within the pneumatic paper stopper 100 is a buffer pressure suitable for the paper roll of the specified specification, when the rolling paper roll hits the pneumatic paper stopper 100, the paper roll will exert a force on the paper stopper structure 103 of the pneumatic paper stopper 100. Under this force, the paper stopper structure 103 can push the piston 1022 in the direction near the air inlet, causing the preset paper stop angle to change. Subsequently, under the action of air pressure, the piston 1022 is pushed along the axial direction of the cylinder 1021, allowing the piston rod 1023 to push the paper stopper structure 103 on the base to rotate back to the preset paper stop angle, thereby achieving the purpose of buffering the paper roll.

[0027] It should be noted that in order to limit the movement of the piston 1022 in the cylinder 1021, a first limiting structure 10211 and a second limiting structure 10212 are also required to be provided on the inner wall of the cylinder 1021, wherein the first limiting structure 10211 and the second limiting structure 10212 are spaced apart along the axial direction of the cylinder 1021. The plug of the piston 1022 is located between the first limiting structure 10211 and the second limiting structure 10212. The first limiting structure 10211 and the second limiting structure 10212 can be limiting blocks. In this case, when there is no ventilation in the cylinder 1021, the plug of the piston 1022 contacts the first limiting structure 10211, and the first limiting structure 10211 can limit the position of the piston 1022. When gas is introduced into the cylinder 1021 of the pneumatic drive device 102 through the gas transmission pipe 202, the gas pressure pushes the piston 1022 to move along the axial direction of the cylinder 1021, causing the piston rod 1023 to push the paper stop structure 103 to rotate on the base 101, causing the paper stop angle between the paper stop structure 103 and the base 101 to gradually increase. Until the plug of the piston 1022 contacts the second limiting structure 10212, the second limiting structure 10212 can limit the piston 1022, preventing it from further moving along the axial direction of the cylinder 1021, thereby preventing the piston rod 1023 from pushing the paper stop structure 103 to rotate on the base. At this point, the paper stop angle between the paper stop structure 103 and the base 101 is the maximum paper stop angle. It should be understood that the paper stop angle between the paper stop structure 103 and the base 101 can be adjusted according to actual conditions and is not limited here.

[0028] As a possible implementation, Figure 1 and Figure 2As shown, the pressure regulating device 201 in the exemplary embodiment of the present disclosure includes a controllable valve 2011, which is disposed on the gas transmission pipeline 202 and is electrically connected to the control device 300. In this case, the air pressure within the gas transmission pipeline 202 can be regulated by adjusting the opening of the controllable valve 2011. For example, when the paper roll ejected from the rewinder is a large-sized paper roll, the control device 300 can increase the opening of the controllable valve 2011, thereby increasing the volume of gas flowing into the gas transmission pipeline 202 and thereby increasing the air pressure within the gas transmission pipeline 202. Subsequently, the gas flows along the gas transmission pipeline 202 into the pneumatic paper stopper 100, resulting in a relatively high air pressure within the pneumatic paper stopper 100. Under this air pressure, the paper stopper 100's paper stopper angle increases, and at this time, the angle is the preset paper stopper angle. When a rolling large-format paper roll contacts the pneumatic paper stopper 100, it exerts a force on the paper stopper structure 103 of the pneumatic paper stopper 100. This force causes the paper stopper structure 103 to push the piston 1022 toward the air inlet, reducing the preset paper stop angle. Subsequently, under the action of air pressure, the piston 1022 is pushed along the axial direction of the cylinder 1021, causing the piston rod 1023 to push the base of the paper stopper structure 103 back to the preset paper stop angle. This prevents the large-format paper roll from continuing to roll while also providing a buffer for the paper roll, ensuring that the large-format paper roll maintains its original shape.

[0029] For example, when the paper roll ejected from the rewinder is a small-sized paper roll, the control device 300 can reduce the opening of the controllable valve 2011, thereby reducing the air pressure within the gas transmission pipeline 202 by reducing the volume of gas entering the gas transmission pipeline 202. Subsequently, the gas flows along the gas transmission pipeline 202 into the pneumatic paper stopper 100, resulting in a relatively low air pressure within the pneumatic paper stopper 100. Under this air pressure, the paper stopper angle of the pneumatic paper stopper 100 is reduced, and this angle is now a preset paper stopper angle. Similarly, when a rolling small-sized paper roll contacts the pneumatic paper stopper 100, the pneumatic paper stopper 100 can prevent the small-sized paper roll from continuing to roll, and the paper stopper angle can act as a buffer for the small-sized paper roll, ensuring that the small-sized paper roll maintains its original shape. Therefore, the paper stopper system provided by the present invention can improve the yield rate of paper rolls, reduce the cost of handling deformed paper rolls and the probability of customer complaints, and ensure that the paper roll can be smoothly fed to the next step. It should be understood that the number of controllable valves and gas transmission pipelines in the exemplary embodiment of the present disclosure can be adjusted according to actual conditions and is not limited here.

[0030] For example, the paper stop structure 103 in the exemplary embodiment of the present disclosure has a paper stop surface 1031, and the pneumatic paper stopper 100 also includes an elastic buffer pad 104 provided on the paper stop surface 1031. The material of the elastic buffer pad 104 can be at least one of a silicone rubber buffer pad, a neoprene buffer pad, and an EPDM buffer pad. It has good elasticity and recovery, can adapt to pressure changes and temperature fluctuations, has appropriate softness, and can fit well with the paper stop surface 1031. Therefore, when the rolling paper roll contacts the paper stop surface 1031, the elastic buffer pad 104 provided on the paper stop surface 1031 can play a buffering role on the paper roll, further reducing the probability of paper roll deformation.

[0031] For example, Figure 1 and Figure 3 As shown, the pneumatic paper stopper 100 in the exemplary embodiment of the present disclosure also includes a rotating shaft 105, which is arranged on the bearing surface of the base 101. When the piston rod 1023 pushes the paper stop structure 103, the paper stop structure 103 is rotatably connected to the base 101 through the rotating shaft 105, thereby adjusting the rotation angle between the paper stop structure 103 and the base 101. During this process, the rotating shaft 105 can withstand both bending moment and torque. In order to extend the service life of the rotating shaft, 38CrMoAIA nitrided steel or 40Cr alloy structural steel can be used as the material of the rotating shaft, thereby improving the strength, impact resistance and toughness of the rotating shaft. The pneumatic paper stopper 100 also includes an elastic limiter 106 provided on the rotating shaft 105, thereby limiting the rotation angle between the paper stopper structure 103 and the base 101, reducing the probability of the paper roll stopping on the pneumatic paper stopper due to excessive rotation angle, which is beneficial to improving the yield of the paper roll and reducing the cost of handling deformed paper rolls and the probability of customer complaints.

[0032] As a possible implementation, Figure 2 As shown, the paper blocking system in the exemplary embodiment of the present disclosure further includes a weighing sensor 400 , which is electrically connected to the control device 300 . The control device 300 includes a digital-to-analog converter 301 , an analog comparison circuit 302 , and an analog-to-digital conversion circuit 303 .

[0033] In practical applications, the load cell 400 is a digital sensor. When the load cell 400 obtains a digital signal indicating the actual weight of the paper roll and a digital signal indicating the standard weight of the paper roll, the signal interface of the load cell 400 is connected to the signal input of the digital-to-analog converter 301, enabling the digital-to-analog converter 301 to convert the digital signal indicating the actual weight of the paper roll and the digital signal indicating the standard weight of the paper roll, respectively, into analog signals indicating the actual weight of the paper roll and the standard weight of the paper roll, respectively. The signal output of the digital-to-analog converter 301 is electrically connected to the signal input of the analog comparator circuit 302, enabling the analog comparator circuit 302 to compare the two signals and determine an analog signal indicating the relatively greater weight of the paper roll. The signal output of the analog comparator circuit 302 is electrically connected to the signal input of the analog-to-digital conversion circuit 303, enabling the analog-to-digital conversion circuit 303 to convert the analog signal indicating the relatively greater weight of the paper roll into an array signal indicating the relatively greater weight of the paper roll. Since the signal output end of the analog-to-digital conversion circuit 303 is electrically connected to the signal interface of the pressure regulating device 201, when the analog-to-digital conversion circuit 303 obtains an array signal indicating a relatively larger weight of the paper roll, the signal can be input into the signal interface of the pressure regulating device 201. The pressure regulating device 201 can adjust the pressure in the gas transmission pipeline 202 according to the signal, and ultimately enable the pneumatic paper stopper to block paper rolls of different specifications, thereby improving gas utilization and reducing waste.

[0034] The above describes the embodiments of the present invention. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. Those skilled in the art may make various substitutions and modifications without departing from the scope of the present invention, and such substitutions and modifications are intended to fall within the scope of the present invention.

Claims

1. A paper stop system, characterized in that: include: Pneumatic paper stopper and gas transmission component; the gas transmission component includes a pressure regulating device and a gas transmission pipeline, the pressure regulating device is arranged on the gas transmission pipeline, and the gas transmission pipeline is connected to the inlet of the pneumatic paper stopper; the paper stopper system also includes a control device, and the control device is electrically connected to the pressure regulating device.

2. The paper stop system according to claim 1, characterized in that: The pressure regulating device comprises a controllable valve, the controllable valve is arranged on the gas transmission pipeline, and the controllable valve is electrically connected to the control device.

3. The paper stop system according to claim 1, characterized in that: The pneumatic paper stopper comprises a base, a pneumatic drive device and a rotatable paper stopper structure disposed on the base, the pneumatic drive device is connected to the paper stopper structure, and the gas transmission pipeline is connected to the pneumatic cavity of the pneumatic drive device.

4. The paper stop system according to claim 3, characterized in that: The paper stopper structure has a paper stopper surface, and the pneumatic paper stopper further includes an elastic buffer pad arranged on the paper stopper surface.

5. The paper stop system according to claim 3, characterized in that: The pneumatic drive device comprises a cylinder and a piston arranged in the cylinder, and a piston rod of the piston is connected to the paper blocking structure.

6. The paper stop system according to claim 5, characterized in that: The inner wall of the cylinder has a first limiting structure and a second limiting structure, and the first limiting structure and the second limiting structure are spaced apart along the axial direction of the cylinder; the plug body of the piston is located between the first limiting structure and the second limiting structure.

7. The paper stop system according to claim 3, characterized in that: The pneumatic paper stopper further comprises a rotating shaft, which is arranged on the bearing surface of the base, and the paper stopper structure is rotatably connected to the base via the rotating shaft.

8. The paper stop system according to claim 7, characterized in that: The pneumatic paper stopper also includes an elastic limiting member arranged on the rotating shaft.

9. The paper stop system according to any one of claims 1 to 8, characterized in that: The paper blocking system further comprises a weighing sensor, which is electrically connected to the control device. The control device comprises a digital-to-analog converter, an analog comparison circuit and an analog-to-digital conversion circuit.

10. The paper stop system according to claim 9, characterized in that: The signal input end of the digital-to-analog converter is electrically connected to the signal interface of the weighing sensor, the signal output end of the digital-to-analog converter is electrically connected to the signal input end of the analog comparison circuit, the signal output end of the analog comparison circuit is electrically connected to the signal input end of the analog-to-digital conversion circuit, and the signal output end of the analog-to-digital conversion circuit is electrically connected to the signal interface of the voltage regulating device.

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