Device and method for monitoring center line glue of filter stick

Abstract

The invention discloses a device and a method for monitoring center line glue of a filter stick. The device comprises an industrial personal computer, a forming paper preheater, a glue spraying nozzle and a thermal imager, wherein the forming paper preheater, the glue spraying nozzle and the thermal imager are sequentially arranged in the conveying direction of forming paper; and the thermal imager is connected with the industrial personal computer. Compared with the prior art, the molding paper is preheated before glue spraying, so that a large temperature difference is formed between the middle line glue sprayed on the molding paper and the preheated molding paper, the middle line glue is highlighted in a developing image of a thermal imager, the monitoring accuracy is improved, and meanwhile, adverse effects caused by error detection can be avoided.

Description

Technical Field

[0001] The present application relates to the technical field of filter rod production, and more specifically, to a monitoring device and method for filter rod centerline glue. Background Art

[0002] In the process of filter rod production, center line glue is one of the key auxiliary materials, which plays the role of bonding the molding paper and the diacetate fiber bundle together to prevent the filter rod from shrinking and the bundle from moving. At present, the center line glue of the filter rod is mainly water-based latex, which is used in two forms: linear spraying or spiral spraying. The center line glue monitoring mainly includes two methods: capacitance monitoring (original machine) and visual monitoring (third-party development).

[0003] Capacitance monitoring refers to measuring the capacity of capacitors in a circuit. The presence or absence of centerline glue on the molding paper will cause a slight change in capacitance. This change process can be monitored through an amplification circuit. If the capacity is lower than the specified value, a warning will be issued or the machine will be directly shut down by program control. This monitoring method is applicable to both linear and spiral spray glue.

[0004] However, after a long period of production activities, it was found that the sensitivity of the capacitor monitoring was too high, and the requirements for the center line glue spraying were high. A slight fluctuation would trigger a program-controlled shutdown, causing frequent start and stop of the equipment, resulting in huge waste. At present, the production process either shields the sensor or lowers the lower limit to avoid frequent shutdowns, which means that the capacitor-type center line glue monitoring is out of use.

[0005] Visual monitoring was developed by a third party in recent years and introduced to the filter rod production line. As we all know, visual monitoring uses industrial cameras to collect product appearance parameters such as color, shape, size, and position, and compares them with preset samples to distinguish and identify.

[0006] Since the center line glue is water-based latex, the color is pure white, and the molding paper is also pure white, they cannot be distinguished by color properties. Visual monitoring is mainly because the linear sprayed center line glue is applied to the molding paper in the form of a long straight line (single or double line). This straight line has a certain thickness. When given side light, a thin black shadow will appear. This black shadow can be captured by the industrial camera, which has a perfect contrast color with the white molding paper. Once the black line is disconnected or disappears, it can be determined that the center line glue is missing.

[0007] However, many filter rod forming machines currently use spiral glue spray nozzles to spray the center glue onto the forming paper in a spiral manner through high-pressure airflow. This glue application method can produce a wider glue line, which has a better bonding effect on the tow and the forming paper. However, the center glue applied by spiral glue spraying is very thin under the action of high-pressure airflow and cannot produce shadows under lighting conditions. At this time, conventional visual monitoring methods cannot achieve the purpose of distinguishing the presence or absence of glue lines.

[0008] In summary, the existing technical means cannot both effectively monitor the existence of the centerline glue and avoid frequent shutdowns of production activities caused by misdetection. Summary of the invention

[0009] The present application provides a monitoring device and method for the centerline glue of a filter rod, wherein the shaping paper is preheated before spraying the glue, so that a large temperature difference is formed between the centerline glue sprayed on the shaping paper and the preheated shaping paper, so that the centerline glue stands out in the development image of the thermal imager, thereby improving the accuracy of monitoring and avoiding the adverse effects caused by misdetection.

[0010] The present application provides a monitoring device for the glue in the center of a filter rod, comprising an industrial computer, a shaping paper preheater, a glue spray nozzle and a thermal imager which are sequentially arranged along the conveying direction of the shaping paper; the thermal imager is connected to the industrial computer.

[0011] Preferably, a cooling element is provided on the glue spray nozzle.

[0012] Preferably, a paper guide is provided at a position on the conveying path of the shaping paper corresponding to the glue spraying nozzle.

[0013] Preferably, a shaping paper preheating roller is provided between the shaping paper preheater and the paper guide plate.

[0014] Preferably, on the conveying path of the shaping paper, a hot melt glue gun and a shaping paper heating plate are sequentially arranged downstream of the thermal imager.

[0015] Preferably, the thermal imager is an infrared imager.

[0016] The present application also provides a method for monitoring the glue in the filter rod, comprising:

[0017] Preheating the plug paper upstream of the glue nozzle;

[0018] Use the glue spray nozzle to spray center line glue on the forming paper;

[0019] The surface temperature of the forming paper coated with the center line glue is detected by a thermal imager to obtain a development map;

[0020] The center line glue spraying area is identified in the developing image by using an industrial computer to determine whether there is center line glue on the forming paper and the spraying condition of the center line glue.

[0021] Preferably, the plugging paper is preheated by a plugging paper preheater upstream of the glue spray nozzle.

[0022] Preferably, the plugging paper is preheated by a plugging paper preheater and a plugging paper preheating roller upstream of the glue spray nozzle.

[0023] Preferably, a cooling element is provided on the glue spray nozzle.

[0024] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0026] Figure 1 A schematic diagram of the structure of the monitoring device for the filter rod midline glue provided in this application;

[0027] Figure 2 The thermal imager development image obtained by the spiral glue spraying method provided in this application;

[0028] Figure 3 This is a thermal imager development image obtained by the linear spraying method provided in this application. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, 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 application.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0031] 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 part of the specification.

[0032] 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.

[0033] The present application provides a monitoring device and method for the centerline glue of a filter rod, wherein the shaping paper is preheated before spraying the glue, so that a large temperature difference is formed between the centerline glue sprayed on the shaping paper and the preheated shaping paper, so that the centerline glue stands out in the development image of the thermal imager, thereby improving the accuracy of monitoring and avoiding the adverse effects caused by misdetection.

[0034] like Figure 1 As shown, the monitoring device for the glue in the filter rod provided in the present application includes an industrial computer (not shown in the figure), a shaping paper preheater 9, a glue spray nozzle 4 and a thermal imager 3 which are sequentially arranged on a frame 1 along the conveying direction of the shaping paper 8.

[0035] like Figure 1 As shown, a paper guide 7 is provided at a position corresponding to the glue spraying nozzle 4 on the conveying path of the shaping paper 8, so as to provide support for the shaping paper 8 and improve the adhesion of the center line glue.

[0036] The thermal imager 3 is used to perform thermal imaging on the molding paper sprayed with the center line glue to form a development image. Figure 2 The developing image obtained after the glue spray nozzle 4 sprays the center line glue in a spiral glue spraying manner is shown, wherein the hotter forming paper 21 appears red, and the cooler glue line 22 appears bluish black. Figure 3 The developing image obtained after the glue spray nozzle 4 sprays the center line glue in a linear spraying manner is shown, wherein the hotter forming paper 31 appears red, and the cooler glue line 32 appears bluish black.

[0037] As an embodiment, the thermal imager 3 is an infrared imager, which has a high sensitivity to temperature, so that the contrast between the molding paper and the center line glue in the development image is higher.

[0038] like Figure 1 As shown, on the conveying path of the shaping paper 8, a hot melt glue gun 2 and a shaping paper heating plate 5 are provided in sequence downstream of the thermal imager 3. A paper guide rod 6 is provided at a position corresponding to the hot melt glue gun 2 to provide guidance and support for the shaping paper. The shaping paper heating plate 5 is used to heat the shaping paper, increase the heat of the center line glue and the viscosity of the melt glue, so that the shaping paper is well bonded to the tow through the center line glue, and at the same time, the two ends of the shaping paper are well bonded together through the hot melt glue.

[0039] Preferably, if Figure 1 As shown, the glue spray nozzle 4 is provided with a cooling element, through which the temperature of the center line glue is reduced, thereby increasing the temperature difference between the preheated forming paper and the center line glue, making the development image of the thermal imager more obvious.

[0040] Preferably, if Figure 1 As shown, a shaping paper preheating roller 10 is provided between the shaping paper preheater 9 and the paper guide 7. The shaping paper preheating roller 10 further preheats the shaping paper on the one hand, and provides steering guidance for the shaping paper on the other hand, thereby reducing the space occupied by the monitoring device.

[0041] The thermal imager 3 is connected to the industrial computer. The industrial computer is used to receive the development image of the thermal imager 3 and identify the glue line in the development image by color comparison, so as to determine whether there is center line glue and the spraying condition of the center line glue.

[0042] Based on the above, the present application also provides a method for monitoring the glue in the filter rod, comprising:

[0043] P1: Preheating of the plug paper upstream of the glue nozzle.

[0044] As an embodiment, the plugging paper is preheated by a plugging paper preheater upstream of the glue spray nozzle.

[0045] Preferably, the plugging paper is preheated by a plugging paper preheater and a plugging paper preheating roller upstream of the glue spray nozzle.

[0046] P2: Use the glue spray nozzle to spray center line glue onto the molding paper.

[0047] As an embodiment, the glue spraying nozzle adopts a spiral glue spraying method.

[0048] As another embodiment, the glue spray nozzle adopts a linear spraying method.

[0049] Preferably, a cooling element is provided on the glue spray nozzle.

[0050] P3: The surface temperature of the forming paper coated with center line glue is detected by a thermal imager to obtain a development map.

[0051] P4: Use the industrial computer to identify the center line glue spraying area in the developing image, determine whether there is center line glue on the forming paper and the spraying status of the center line glue (for example, whether it is interrupted).

[0052] The present application solves the problem of difficult and inaccurate monitoring of center line glue during filter rod production.

[0053] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A monitoring device for the rubber in the filter rod, characterized in that: The invention comprises an industrial computer, a shaping paper preheater, a glue spraying nozzle and a thermal imager which are sequentially arranged along the conveying direction of the shaping paper; the thermal imager is connected with the industrial computer.

2. The monitoring device for the filter rod midline glue according to claim 1, characterized in that: The glue spraying nozzle is provided with a refrigeration element.

3. The monitoring device for the rubber in the filter rod according to claim 1 or 2, characterized in that: A paper guide is provided at a position on the conveying path of the shaping paper corresponding to the glue spraying nozzle.

4. The monitoring device for the rubber in the filter rod according to claim 3, characterized in that: A shaping paper preheating roller is provided between the shaping paper preheater and the paper guide plate.

5. The monitoring device for the rubber in the filter rod according to claim 1 or 4, characterized in that: On the conveying path of the shaping paper, a hot melt glue gun and a shaping paper heating plate are sequentially arranged downstream of the thermal imager.

6. The monitoring device for the rubber in the filter rod according to claim 1, characterized in that: The thermal imager is an infrared imager.

7. A method for monitoring the line glue in a filter rod, characterized in that: include: Preheating the plug paper upstream of the glue nozzle; Use the glue spray nozzle to spray center line glue on the forming paper; The surface temperature of the forming paper coated with the center line glue is detected by a thermal imager to obtain a development map; The center line glue spraying area is identified in the developing image by using an industrial computer to determine whether there is center line glue on the forming paper and the spraying condition of the center line glue.

8. The method for monitoring the rubber in the filter rod according to claim 7, characterized in that: The wrapping paper is preheated by a wrapping paper preheater upstream of the glue nozzle.

9. The method for monitoring the rubber in the filter rod according to claim 7, characterized in that: The wrapping paper is preheated by a wrapping paper preheater and a wrapping paper preheating roller upstream of the glue spray nozzle.

10. The method for monitoring the rubber in the filter rod according to claim 7, characterized in that: The glue spraying nozzle is provided with a refrigeration element.

Images