Tow over-filling identification system and method

Abstract

The invention provides a tow over-filling identification system and method.The system comprises an identification controller, a pressure sensor, a valve controller and a rejecting valve, the pressure sensor is arranged on an air supply pipe of a conveying nozzle, and the pressure sensor is used for detecting the air pressure value in the conveying nozzle in real time; the pressure sensor and the valve controller are electrically connected with the recognition controller, the recognition controller is electrically connected with a control unit of the forming machine, and the valve controller is used for controlling the removing valve to act so as to remove unqualified filter sticks. The pressure sensor is used for detecting the air pressure value in the conveying nozzle in real time and transmitting the air pressure value to the recognition controller, the recognition controller judges whether tows are overfilled or not according to the real-time air pressure value, and if the tows are overfilled, unqualified filter sticks are removed. According to the device, the unqualified filter sticks caused by tow over-filling can be detected in real time and removed, and the unqualified filter sticks are effectively prevented from flowing into the next procedure.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco manufacturing, and in particular relates to a tow overfilling identification system and method. Background Art

[0002] During the process of opening the tow, after being initially loosened and dispersed by the first-stage air opener, the tow is completely loosened and dispersed by the second-stage air opener, the brake roller group, the input roller group, and the stretching roller group. The tow then passes through the third-stage air opener, where it is completely loosened and dispersed, with the maximum width. After being evenly sprayed with plasticizer, it is gathered and transported to the delivery nozzle by the wedge-shaped groove roller. The delivery nozzle adopts the Venturi principle in physics, and uses a proportional control valve to control the amount of air supplied to the delivery nozzle, generating a certain negative pressure suction in the nozzle opening of the delivery nozzle, so that the tow gathered and transported by the wedge-shaped groove roller is sucked into the nozzle channel of the delivery nozzle.

[0003] During the production process, due to the uneven distribution of the tow in the molding paper, filter rods with uneven hardness and significantly exceeded pressure drop are produced. Such filter rods are called "bamboo" filter rods. Since it is difficult to judge the quality of unqualified filter rods due to overfilling of the tow from the appearance, the filter rods produced within a selected period of time are usually manually checked one by one by weighing or checking the circumference after curing, and the filter rods cannot be inspected in real time. This can easily lead to missed inspections, making it easy for unqualified filter rods to flow into the next process. Therefore, how to design a tow overfilling identification system and method to detect unqualified filter rods caused by tow overfilling in real time and prevent unqualified filter rods from flowing into the next process has become a technical problem that technicians in this field urgently need to solve. Summary of the invention

[0004] The object of the present invention is to provide a tow overfilling identification system to solve the above technical problems in the prior art. Another object of the present invention is to provide a tow overfilling identification method.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A tow overfilling identification system comprises an identification controller, a pressure sensor, a valve controller and a rejection valve, wherein the pressure sensor is arranged on the air supply pipe of a delivery nozzle, and the pressure sensor is used for real-time detection of the air pressure value in the delivery nozzle; the pressure sensor and the valve controller are respectively electrically connected to the identification controller, and the identification controller is electrically connected to the control unit of a forming machine, and the valve controller is used for controlling the action of the rejection valve to realize the rejection of unqualified filter rods.

[0007] Preferably, the identification controller is a PLC controller.

[0008] A method for identifying overfilling of a tow, comprising:

[0009] Step S1, the recognition controller obtains the operating status signal of the molding machine through the control unit of the molding machine to determine whether the molding machine is in the production state;

[0010] Step S2, when it is determined that the molding machine is in the production state, the identification controller obtains the real-time air pressure value in the delivery nozzle through the pressure sensor, and then determines whether the tow is overfilled according to the real-time air pressure value. If yes, step S3 is executed; if no, step S4 is executed;

[0011] Step S3, the identification controller sends a rejection signal to the valve controller, and the valve controller controls the rejection valve to remove the unqualified filter rods;

[0012] Step S4: the identification controller does not send a rejection signal to the valve controller, and the rejection valve does not operate.

[0013] Preferably, in step S2, the specific method for determining whether the filament bundle is overfilled is as follows: determining whether the absolute value of the difference between the real-time air pressure value and the air pressure moving average value is greater than the set pressure value; if so, the filament bundle is overfilled; if not, the filament bundle is not overfilled; wherein the air pressure moving average value is the average value of multiple real-time air pressure values ​​detected within a certain period of time.

[0014] Preferably, the set pressure value is a set multiple of the standard deviation of the air pressure, and the standard deviation of the air pressure is the standard deviation of the above-mentioned multiple real-time air pressure values.

[0015] Preferably, the set pressure value is 2.5 to 3.5 times the standard deviation of the air pressure.

[0016] Preferably, the set pressure value is 3 times the standard deviation of the air pressure.

[0017] Preferably, in step S3, the identification controller sends a rejection signal to the valve controller and also sends a shutdown signal to the control unit of the molding machine, and then the control unit of the molding machine controls the molding machine to shut down.

[0018] The beneficial effects of the present invention are:

[0019] The system and method for identifying overfilling of tow of the present invention can detect the air pressure value in the delivery nozzle in real time by using a pressure sensor and transmit it to the identification controller. The identification controller determines whether the tow is overfilled according to the real-time air pressure value. If the tow is overfilled, the identification controller will control the action of the rejection valve through the valve controller to reject the unqualified filter rod. It can be seen that the present invention can detect unqualified filter rods caused by overfilling of tow in real time and reject them, thereby effectively preventing unqualified filter rods from flowing into the next process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments, and further describe the specific embodiments of the present invention in detail in conjunction with the drawings, wherein

[0021] Figure 1 A schematic diagram of a tow overfilling identification system provided by an embodiment of the present invention;

[0022] Figure 2 A flow chart of a method for identifying overfilling of a tow provided in an embodiment of the present invention.

[0023] Markings in the accompanying drawings:

[0024] 11. conveying nozzle, 12. air supply pipe, 13. wedge groove roller, 14. tow;

[0025] 21. Pressure sensor; 31. Identification controller; 41. Valve controller;

[0026] 51. Control unit of molding machine. DETAILED DESCRIPTION

[0027] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0028] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0029] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0030] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0031] like Figure 1As shown, an embodiment of the present invention provides a tow overfilling identification system, which includes an identification controller 31, a pressure sensor 21, a valve controller 41, and a rejection valve. The pressure sensor 21 is arranged on the air supply pipe 12 of the delivery nozzle 11, and the pressure sensor 21 is used to perform real-time detection of the air pressure value in the delivery nozzle; the pressure sensor 21 and the valve controller 41 are electrically connected to the identification controller 31 respectively, and the identification controller is electrically connected to the control unit 51 of the forming machine, and the valve controller is used to control the action of the rejection valve to achieve the rejection of unqualified filter rods.

[0032] Specifically, the identification controller 31 is a PLC controller.

[0033] like Figure 2 As shown, an embodiment of the present invention further provides a method for identifying overfilling of a tow, which comprises:

[0034] Step S1, the recognition controller obtains the operating status signal of the molding machine through the control unit of the molding machine to determine whether the molding machine is in the production state;

[0035] Step S2, when it is determined that the molding machine is in the production state, the identification controller obtains the real-time air pressure value in the delivery nozzle through the pressure sensor, and then determines whether the tow is overfilled according to the real-time air pressure value. If yes, step S3 is executed; if no, step S4 is executed;

[0036] Step S3, the identification controller sends a rejection signal to the valve controller, and the valve controller controls the rejection valve to remove the unqualified filter rods;

[0037] Step S4: the identification controller does not send a rejection signal to the valve controller, and the rejection valve does not operate.

[0038] Furthermore, in step S2, the specific method for determining whether the filament bundle is overfilled is as follows: determine whether the absolute value of the difference between the real-time air pressure value and the air pressure moving average value is greater than the set pressure value; if so, that is, the real-time air pressure value does not meet the requirements, then the filament bundle is overfilled; if not, that is, the real-time air pressure value meets the requirements, then the filament bundle is not overfilled; wherein, the air pressure moving average value is the average value of multiple real-time air pressure values ​​detected within a certain period of time.

[0039] Specifically, the set pressure value is a set multiple of the standard deviation of the air pressure, and the standard deviation of the air pressure is the standard deviation of the above multiple real-time air pressure values. The calculation formula and method of the standard deviation are commonly used methods in the prior art and will not be repeated here.

[0040] Furthermore, the set pressure value is 2.5 to 3.5 times the standard deviation of the air pressure.

[0041] Preferably, the set pressure value is 3 times the standard deviation of the air pressure.

[0042] Specifically, in step S3, the identification controller 31 sends a rejection signal to the valve controller 41, and also sends a stop signal to the control unit 51 of the molding machine, and then the control unit 51 of the molding machine controls the molding machine to stop. It can be understood that when it is determined that the molding machine is not in production, the tow overfilling identification system does not work; after the rejection valve is actuated, if the rejection valve is opened, the rejection mechanism will be actuated to reject the unqualified filter rods into the waste bin, and after a certain delay of time, such as 5 seconds, the rejection valve returns to its position, and the rejection mechanism also returns to its position; Figure 1 The dashed lines in the diagram represent electrical connections.

[0043] During the production of the molding machine, compressed air is sent into the delivery nozzle through the air supply pipe 12, and then the compressed air is used to deliver the filament bundle to the inlet tongue of the smoke gun through the delivery nozzle 11. The proportional control valve is arranged on the air supply pipe and is located upstream of the pressure sensor, which is used to control the amount of air in the delivery nozzle, and generate a certain negative pressure suction at the nozzle mouth of the delivery nozzle, so that the filament bundle 14 gathered and delivered by the wedge groove roller 13 is sucked into the nozzle channel of the delivery nozzle. If the air pressure value at the delivery nozzle is relatively stable without large fluctuations, it indicates that the filament bundle is evenly delivered and filled at this time, and there is no overfilling; if the filament bundle is overfilled at the inlet tongue of the smoke gun, it will cause the filament bundle to run poorly, which will inevitably cause excessive fluctuations in the air pressure value at the delivery nozzle, so that the air pressure value does not meet the requirements. Therefore, the present invention can determine whether the filament bundle is overfilled by detecting the air pressure value of the delivery nozzle and judging whether the air pressure value meets the requirements.

[0044] The wire bundle overfilling identification system and method provided by the embodiment of the present invention can detect the air pressure value in the delivery nozzle in real time by using a pressure sensor and transmit it to the identification controller. The identification controller determines whether the wire bundle is overfilled based on the real-time air pressure value. If the wire bundle is overfilled, the identification controller will control the action of the rejection valve through the valve controller to reject the unqualified filter rod. It can be seen that the present invention can not only detect unqualified filter rods caused by overfilling of the wire bundle in real time, but also reject unqualified filter rods, thereby effectively preventing unqualified filter rods from flowing into the next process; at the same time, it improves the function of the filter rod forming machine; and eliminates manual inspection, reducing the labor intensity of the staff.

[0045] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A tow overfilling identification system, characterized in that: It includes an identification controller, a pressure sensor, a valve controller, and a rejection valve. The pressure sensor is arranged on the air supply pipe of the delivery nozzle, and the pressure sensor is used to detect the air pressure value in the delivery nozzle in real time; the pressure sensor and the valve controller are electrically connected to the identification controller respectively, and the identification controller is electrically connected to the control unit of the molding machine. The valve controller is used to control the action of the rejection valve to realize the rejection of unqualified filter rods.

2. The tow overfilling identification system according to claim 1, characterized in that: The identification controller is a PLC controller.

3. A method for identifying overfilling of a tow, characterized in that: It includes: Step S1, the recognition controller obtains the operating status signal of the molding machine through the control unit of the molding machine to determine whether the molding machine is in the production state; Step S2, when it is determined that the molding machine is in the production state, the identification controller obtains the real-time air pressure value in the delivery nozzle through the pressure sensor, and then determines whether the tow is overfilled according to the real-time air pressure value. If yes, step S3 is executed; if no, step S4 is executed; Step S3, the identification controller sends a rejection signal to the valve controller, and the valve controller controls the rejection valve to remove the unqualified filter rods; Step S4: the identification controller does not send a rejection signal to the valve controller, and the rejection valve does not operate.

4. The method for identifying tow overfilling according to claim 3, characterized in that: In step S2, the specific method for determining whether the filament bundle is overfilled is as follows: determine whether the absolute value of the difference between the real-time air pressure value and the air pressure moving average value is greater than the set pressure value; if so, the filament bundle is overfilled; if not, the filament bundle is not overfilled; wherein the air pressure moving average value is the average value of multiple real-time air pressure values ​​detected within a certain period of time.

5. The method for identifying tow overfilling according to claim 4, characterized in that: The set pressure value is a set multiple of the standard deviation of the air pressure, and the standard deviation of the air pressure is the standard deviation of the above-mentioned multiple real-time air pressure values.

6. The method for identifying tow overfilling according to claim 5, characterized in that: The set pressure value is 2.5 to 3.5 times the standard deviation of the air pressure.

7. The method for identifying tow overfilling according to claim 6, characterized in that: The set pressure value is 3 times the standard deviation of the air pressure.

8. The method for identifying tow overfilling according to any one of claims 3 to 7, characterized in that: In step S3, the identification controller sends a rejection signal to the valve controller and also sends a stop signal to the control unit of the molding machine, and then the control unit of the molding machine controls the molding machine to stop.

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