An online detection device for filtration efficiency in the production of meltblown cloth

Abstract

The present invention provides an online detection device for filtration efficiency of meltblown cloth production, which specifically relates to the field of meltblown cloth production. An electrostatic device is provided at the rear section of the meltblown cloth, the electret rod [2] is located directly below the first metal roller [10], and the metal roller [10] is grounded to the machine chassis, and the meltblown cloth can be subjected to the electret effect and high-voltage electrostatic radiation during the process of rotating toward the cloth collecting roller [5]; the high voltage emitted by the electrostatic generator is controlled by the meltblown cloth control system and adjusted according to the detection result of the latter stage filtration efficiency. The present invention can detect the filtration efficiency of the meltblown cloth in real time and online during the production process through this device, and feed back to the control system of the meltblown machine, so as to adjust the process parameters in time to ensure that the filtration efficiency of the produced meltblown cloth meets the standard requirements.

Description

Technical Field

[0001] The present invention belongs to the field of meltblown cloth production, and specifically relates to an online detection device for filtration efficiency used in the production of meltblown cloth. Background Art

[0002] As the novel coronavirus ravages the world, the demand for masks has increased dramatically, and meltblown cloth, the core material of masks, is also in short supply. An important technical indicator of meltblown cloth: filtration efficiency. The filtration efficiency has always been tested after a roll of meltblown cloth is processed. Such testing has the following two disadvantages. First, it cannot guarantee that the filtration efficiency of a roll of meltblown cloth produced is all qualified; second, the process parameters cannot be adjusted at any time during the production process to ensure that the produced meltblown cloth meets the standard requirements. Meltblown cloth is the core material of the mask. Whether the mask can block the virus from entering the human respiratory tract through breathing is mainly determined by the filtration efficiency of the meltblown cloth. Therefore, it is particularly important to monitor the filtration efficiency of the meltblown cloth at any time during the production process. Summary of the invention

[0003] The purpose of the present invention is to provide an online detection device for filtration efficiency for the production of meltblown cloth. In view of the problem that there is no real-time and online detection in the current domestic meltblown cloth production process, the filtration efficiency of the meltblown cloth can be detected in real time and online during the production process through this device, and the feedback can be given to the control system of the meltblown machine to adjust the process parameters in time to ensure that the filtration efficiency of the produced meltblown cloth meets the standard requirements.

[0004] The present invention provides the following technical solutions:

[0005] An online detection device for filtering efficiency used in the production of melt-blown fabrics is provided. An electrostatic device is provided at the rear section of the melt-blown fabrics. An electret rod [2] is located directly below a first metal roller

[10] . The metal roller

[10] is grounded to a machine chassis. The melt-blown fabrics can be subjected to electret action and high-voltage electrostatic radiation during the process of rotating toward a collecting roller [5]. The high voltage generated by the electrostatic generator is controlled by a melt-blown fabric control system and adjusted according to the detection result of the rear-stage filtering efficiency.

[0006] Preferably, an aerosol sending box [7] is provided between the first metal roller

[10] and the second metal roller [6], above the meltblown cloth; a NaCl aerosol generator [9] is provided on the aerosol sending box [7], and the aerosol generator 9 can send NaCl aerosol to the aerosol sending box [7] at a fixed time under the control of the control system. A laser particle detection sensor [8] is provided at the end of the aerosol sending box [7], which is used to detect the number of large and small particles in the box after the NaCl aerosol generator sends aerosol to the aerosol sending box [7].

[0007] Preferably, an aerosol receiving box [4] is provided below the aerosol sending box [7] and below the meltblown cloth; when the NaCl aerosol generator sends particles to the aerosol sending box [7], the particles flow to the aerosol receiving box [4] through the meltblown cloth under the action of the airflow; and a laser particle detection sensor [3] is provided on the end surface of the aerosol receiving box [4] for detecting the number of particles in the aerosol receiving box [4].

[0008] Preferably, the MCU can send a command to the aerosol generator [9], and the aerosol generator [9] sends aerosol to the aerosol sending box [7] in a quantitative manner. The lower laser particle detection sensor [8] installed at one end of the aerosol sending box [7] detects whether the number of particles in the aerosol sending box [7] meets the preset value and feeds back to the MCU. The MCU adjusts the parameters of the aerosol generator [9] according to the returned data until the number of particles detected in the aerosol sending box [7] meets the set requirements.

[0009] Preferably, when the number of particles in the aerosol sending box [7] meets the preset value and the delay setting time, the lower laser particle detection sensor [3] arranged on the end face of the aerosol receiving box [4] is activated to detect the number of particles in the aerosol receiving box [4] and feed it back to the MCU; the MCU compares and calculates the particle data of the receiving and sending boxes, obtains the filtration efficiency of various particle diameters, and displays it on the display.

[0010] Preferably, when it is detected that the deviation between the filtration efficiency and the value set by the system reaches a certain value, the MCU can drive the meltblown machine control system to adjust the temperature or speed or pressure or electrostatic voltage parameters.

[0011] Beneficial effects of the present invention:

[0012] This device aims at increasing the online filtration efficiency detection technology in the manufacturing process of meltblown cloth, and detects the filtration efficiency of meltblown cloth in real time during the production process. The detected data is fed back to the meltblown machine control system, and the relevant process parameters are adjusted in time to control the filtration efficiency of the produced meltblown cloth to meet the requirements. By setting an aerosol generator, an aerosol sending box, an aerosol receiving box, and a lower laser particle detection sensor in the meltblown cloth production process, the number of particles in the sending box and the receiving box are detected in time, and the filtration efficiency of the meltblown cloth is detected in real time; and the detected meltblown cloth filtration efficiency is fed back to the meltblown machine control system, and the process parameters are adjusted in real time to control the quality of the meltblown cloth to meet the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0014] Figure 1It is a structural diagram of the present invention;

[0015] Figure 2 It is the structural principle diagram of the present invention;

[0016] Figure 1 The markings are: 1. meltblown cloth; 2. electret rod; 3. lower laser particle detection sensor; 4. aerosol receiving box; 5. cloth collecting roller; 6. second metal roller; 7. aerosol sending box; 8. upper laser particle detection sensor; 9. aerosol generator; 10. first metal roller. DETAILED DESCRIPTION

[0017] See also Figure 1 to Figure 2, an online detection device for filtration efficiency for producing melt-blown cloth 1, an electrostatic device is provided at the rear section of melt-blown cloth 1, the electret rod 2 is located directly below the first metal roller 10, and the metal roller 10 is grounded to the machine chassis, and the melt-blown cloth 1 can be subjected to electret effect and high-voltage electrostatic radiation during the process of rotating toward the cloth collecting roller 5; the high voltage emitted by the electrostatic generator is controlled by the control system of the melt-blown cloth 1, and is adjusted according to the detection result of the later stage filtration efficiency. An aerosol sending box 7 is provided between the first metal roller 10 and the second metal roller 6, located above the melt-blown cloth 1; a NaCl aerosol generator 9 is provided on the aerosol sending box 7, and the aerosol generator 9 can send NaCl aerosol to the aerosol sending box 7 at a fixed time under the control of the control system. A laser particle detection sensor 8 is provided at the end of the aerosol sending box 7, which is used to detect the number of large and small particles in the box after the NaCl aerosol generator sends aerosol to the aerosol sending box 7. An aerosol receiving box 4 is provided below the aerosol sending box 7 and below the meltblown cloth 1; after the NaCl aerosol generator sends particles to the aerosol sending box 7, the particles flow to the aerosol receiving box 4 through the meltblown cloth 1 under the action of the airflow; a laser particle detection sensor 3 is provided on the end face of the aerosol receiving box 4 to detect the number of particles in the aerosol receiving box 4. The MCU can send a command to the aerosol generator 9, and the aerosol generator 9 quantitatively sends aerosol to the aerosol sending box 7. The lower laser particle detection sensor 8 installed at one end of the aerosol sending box 7 detects whether the number of particles in the aerosol sending box 7 meets the preset value, and feeds back to the MCU. The MCU adjusts the parameters of the aerosol generator 9 according to the returned data until the number of particles detected in the aerosol sending box 7 meets the set requirements. When the number of particles in the aerosol sending box 7 meets the preset value and the delay setting time, the lower laser particle detection sensor 3 set on the end face of the aerosol receiving box 4 is activated to detect the number of particles in the aerosol receiving box 4 and feed it back to the MCU; the MCU compares and calculates the particle data of the receiving and sending boxes, obtains the filtration efficiency of various particle diameters, and displays it on the display. When it is detected that the deviation between the filtration efficiency and the value set by the system reaches a certain value, the MCU can drive the meltblown machine control system to adjust the temperature, speed, pressure or electrostatic voltage parameters.

[0018] The working mode of the present invention is:

[0019] like Figure 1 to Figure 2As shown, an electrostatic device is added to the back section of the meltblown cloth 1, and the electret 2 is facing a first metal roller 10 of the cloth collecting device. The metal roller 10 is well grounded to the machine chassis, so that a high-voltage electric field is formed between the electret and the metal roller. The meltblown cloth 1 is subjected to the electret effect and high-voltage electrostatic radiation during the rotation process toward the cloth collecting roller 5. The high voltage emitted by the electrostatic generator is controlled by the meltblown cloth 1 control system and adjusted in time according to the test results of the rear-stage filtration efficiency. An aerosol sending box 7 is set between the first metal roller 10 and the second metal roller 6 and above the meltblown cloth 1. A NaCl aerosol generator 9 is set on the sending box. The aerosol generator sends NaCl aerosol to the aerosol sending box 7 at a fixed time under the control of the control system. A laser particle detection sensor 8 is set in front of one end of the aerosol sending box 7. After the NaCl aerosol generator sends aerosol to the aerosol sending box 7, the number of large and small particles in the box is detected. An aerosol receiving box 4 is arranged below the aerosol sending box 7 and below the meltblown cloth 1. After the NaCl aerosol generator sends particles to the aerosol sending box 7, the particles flow to the aerosol receiving box 4 through the meltblown cloth 1 under a certain airflow. A laser particle detection sensor 3 is arranged in front of the end of the aerosol receiving box 4. The sensor detects the number of various particles in the receiving box, which is the number of particles after the aerosol is filtered through the meltblown cloth 1.

[0020] The online detection data logic calculation part of the product filtration efficiency during the manufacturing process of meltblown cloth 1 is as follows Figure 2 As shown:

[0021] S1. After the system is started, the MCU sends a command to the aerosol generator 9, and the aerosol transmitter sends aerosol to the aerosol sending box 7 in a quantitative manner. The lower laser particle detection sensor 8 installed at one end of the aerosol sending box 7 detects whether the number of particles in the aerosol sending box 7 meets the set requirements, and feeds back to the MCU. The MCU adjusts the parameters of the aerosol generator 9 according to the returned data until the number of particles detected in the aerosol sending box 7 meets the set requirements.

[0022] S2. When the number of particles in the aerosol sending box 7 meets the set requirements, the set time is delayed, and the lower laser particle detection sensor 3 installed on the end surface of the aerosol receiving box 4 is started to detect the number of particles in the aerosol receiving box 4 and feed it back to the MCU. The MCU compares and calculates the particle data of the receiving and sending boxes, obtains the filtration efficiency of various particle diameters, and displays it on the display.

[0023] S3. When it is detected that the deviation between the filtration efficiency and the value set by the system reaches a certain value, the MCU drives the meltblown machine control system to adjust relevant process parameters, such as temperature, speed, pressure, and electrostatic voltage.

[0024] S4, melt-blown cloth 1 starts from stable production, and the online detection system of product filtration efficiency during the manufacturing process of melt-blown cloth 1 is continuously carried out: the aerosol generator 9 sends aerosol, continuously detects the number of particles in the aerosol sending box 7 and the number of particles in the aerosol receiving box 4, calculates, displays, and adjusts the process parameters, and the cycle is carried out;

[0025] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An online detection device for filtration efficiency for producing meltblown cloth, characterized in that: An electrostatic device is provided at the rear section of the meltblown fabric, wherein the electret rod [2] is located directly below the first metal roller [10], and the metal roller [10] is grounded to the machine chassis, and the meltblown fabric can be subjected to the electret effect and high-voltage electrostatic radiation during the process of rotating toward the fabric collecting roller [5]. The high voltage generated by the electrostatic generator is controlled by the meltblown fabric control system and adjusted based on the test results of the post-stage filtration efficiency; An aerosol sending box [7] is provided between the first metal roller [10] and the second metal roller [6], and is located above the melt-blown cloth; a NaCl aerosol generator [9] is provided on the aerosol sending box [7], and the aerosol generator [9] can send NaCl aerosol to the aerosol sending box [7] at a fixed time under the control of the control system; a laser particle detection sensor [8] is provided at the end of the aerosol sending box [7], and is used to detect the number of large and small particles in the aerosol sending box [7] after the NaCl aerosol generator sends aerosol to the aerosol sending box [7]; An aerosol receiving box [4] is provided below the aerosol sending box [7] and below the meltblown cloth; when the NaCl aerosol generator sends particles to the aerosol sending box [7], the particles flow to the aerosol receiving box [4] through the meltblown cloth under the action of the airflow; a laser particle detection sensor [3] is provided on the end surface of the aerosol receiving box [4] for detecting the number of particles in the aerosol receiving box [4]; The MCU can send a command to the aerosol generator [9], and the aerosol generator [9] sends aerosol to the aerosol sending box [7] in a fixed amount. The lower laser particle detection sensor [8] installed at one end of the aerosol sending box [7] detects whether the number of particles in the aerosol sending box [7] meets the preset value, and feeds back to the MCU. The MCU adjusts the parameters of the aerosol generator [9] according to the returned data until the number of particles in the aerosol sending box [7] meets the set requirements. When the number of particles in the aerosol sending box [7] meets the preset value and the delay setting time, the lower laser particle detection sensor [3] arranged on the end surface of the aerosol receiving box [4] is activated to detect the number of particles in the aerosol receiving box [4] and feed it back to the MCU; the MCU compares and calculates the particle data of the receiving box and the sending box, obtains the filtration efficiency of various particle diameters, and displays it on the display; When it is detected that the deviation between the filtration efficiency and the value set by the system reaches a certain value, the MCU can drive the meltblown machine control system to adjust the temperature, speed, pressure or electrostatic voltage parameters.

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