Paper air permeability measuring device

Abstract

The utility model discloses a paper air permeability measuring device. The measuring device comprises a device frame, a measuring surface, a measuring assembly and a control assembly, the device frame is provided with a measuring channel arranged in the front-back direction. The measuring surface is arranged at the bottom of the measuring channel, and a plurality of measuring holes are formed in the measuring surface; the measuring holes are arranged on the measuring surface along the left-right direction; the measuring assembly is arranged on the lower side of the measuring surface, is connected with the measuring hole and is used for measuring the air permeability of the paper; the control assembly is electrically connected with the measuring assembly; the measuring assembly can transmit the air permeability measuring result of the paper to the control assembly. By means of the arrangement, the measuring device can measure the air permeability of paper in the paper making process, and the measuring period is greatly shortened; meanwhile, the measuring mode does not need to sample the paper roll, so that the risk of paper breakage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of paper detection, in particular to a device for measuring the air permeability of paper. Background Art

[0002] The main quality characteristics of paper products include paper grammage, air permeability, paper strength and ductility, appearance performance, sensory performance, safety and hygiene requirements, and adaptability to the machine. The air permeability includes air permeability and its deviation, and the coefficient of variation of air permeability.

[0003] The air permeability of paper refers to the time required for a certain volume of air to pass through a specific measurement area under a specific pressure. The shorter the time, the better the air permeability. The air permeability index is the core index for measuring the air permeability performance of paper.

[0004] The traditional measurement of paper air permeability is carried out in the laboratory. The biggest problem with this measurement method is the long measurement cycle. The measurement of paper air permeability is usually carried out after the paper making process is stable and at the end of the paper making process. It is impossible to monitor the paper quality during the paper making process in a timely manner. When the measured air permeability index of the paper is unqualified after the paper making is completed, the whole roll of paper can only be downgraded or even treated as waste paper, resulting in a waste of paper resources. Content of the Utility Model

[0005] In order to solve the deficiencies of the prior art, the purpose of the utility model is to provide a device for measuring the air permeability of paper, which can detect the air permeability of paper in a timely and convenient manner during the paper making process.

[0006] Based on the above purpose, the utility model adopts the following technical solutions:

[0007] A device for measuring the air permeability of paper, comprising: a device frame, a measurement surface, a measurement component, a control component, and a control panel; a measurement channel is arranged on the device frame along the front-rear direction; the measurement surface is arranged at the bottom of the measurement channel, and a plurality of measurement holes are arranged on the measurement surface; the measurement holes are arranged on the measurement surface along the left-right direction; the measurement component is arranged on the lower side of the measurement surface and is connected to the measurement holes for measuring the air permeability of paper; the control component is electrically connected to the measurement component; the measurement component can transmit the measurement result of the air permeability of paper to the control component.

[0008] Further, the measurement component includes a microporous filter element, an air permeability measuring element, a Venturi tube, an air permeability automatic regulating valve, and an air permeability pressure detecting element; one end of the microporous filter element is connected to the measurement hole, and the other end is connected to the air permeability measuring element and the air permeability pressure detecting element; one end of the Venturi tube is connected to the air permeability measuring element, and the other end is connected to the air permeability automatic regulating valve.

[0009] Further, the measuring device further includes a gas source regulating component; the gas source regulating component is connected to the measurement component and is electrically connected to the control component.

[0010] Further, the air source regulating assembly includes a pneumatic switch valve, a pneumatic detector, an air filter, and a pneumatic regulating valve; one end of the pneumatic switch valve is connected to the air permeability automatic regulating valve, and the other end is connected to the pneumatic detector; one end of the air filter is connected to the pneumatic detector, and the other end is connected to the pneumatic regulating valve.

[0011] Further, the measuring device further includes a photoelectric signal switch for detecting whether there is paper passing through the measuring surface; the photoelectric signal switch is arranged on the front end surface of the device frame and at least partially on the upper side of the measuring channel.

[0012] Further, the photoelectric signal switch is electrically connected to the control assembly. When it detects that there is paper passing through the measuring channel, it outputs a start signal to the control assembly; when the control assembly receives the start signal, it starts the measuring assembly to measure the air permeability of the paper.

[0013] Further, the measuring device further includes a control panel, which is arranged on the left end surface or the right end surface of the device frame and is electrically connected to the control assembly; the control assembly can transmit the air permeability measurement result to the control panel for displaying the air permeability measurement result.

[0014] Further, an expansion slot for adding measuring holes and measuring components is provided on the measuring surface.

[0015] Further, a wear-resistant coating is provided on the measuring surface.

[0016] Further, a base is provided at the bottom of the measuring surface; the base is made of stainless steel.

[0017] The utility model provides a device for measuring the air permeability of paper. The measuring assembly of the measuring device can generate negative pressure, adsorb the paper on the measuring surface through the measuring holes, and measure the air permeability of the paper, so that the air permeability of the paper can be measured during the paper making process, greatly shortening the measurement cycle; at the same time, this measurement method does not require sampling of the paper roll and there is no risk of paper breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the measuring device provided by the utility model;

[0019] Figure 2 is a sectional view of the measuring device provided by the utility model;

[0020] Figure 3 is a schematic structural diagram of the measuring assembly and the air source regulating assembly provided by the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Combined with the embodiments of the present utility model, the technical solutions in the embodiments will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present utility model.

[0022] At the same time, in order to clearly illustrate the technical solutions of this application, the upper side, lower side, left side, right side, front side, and rear side as shown in Figure 1 are also defined.

[0023] As shown in Figure 1 and Figure 2 , this embodiment provides a device for measuring the air permeability of paper. The measuring device includes a device frame 11, a measuring surface 12, a measuring component 13, a control component, and a control panel 14.

[0024] Specifically, a measuring channel 111 is provided on the device frame 11 along the front-rear direction. The measuring surface 12 is arranged at the bottom of the measuring channel 111, and a plurality of measuring holes 15 are provided on the measuring surface 12. The measuring holes 15 are arranged on the measuring surface 12 along the left-right direction. The measuring component 13 is arranged on the lower side of the measuring surface 12 and is connected to the measuring holes 15, and can generate negative pressure to adsorb the paper onto the measuring surface 12 for measuring the air permeability of the paper. Thus, without interrupting the paper making process, it is only necessary to make the paper pass above the measuring surface 12 during the papermaking process to detect the air permeability of the paper. The control component is electrically connected to the measuring component 13; the measuring component 13 can transmit the measured air permeability result of the paper to the control component; at the same time, the control component is also connected to the distributed control system for controlling the paper making, and can output the air permeability measurement result to the distributed control system, and according to the logic programming and interlocking, timely change the process conditions of the paper making to adjust the air permeability of the paper, avoiding hysteresis and reducing the waste of paper production resources. The control panel 14 is arranged on the left end face or the right end face of the device frame 11 and is electrically connected to the control component. The control component can transmit the air permeability measurement result to the control panel 14 for displaying the air permeability measurement result, so that the user can timely adjust the papermaking process according to the air permeability measurement result, avoiding the hysteresis of the process adjustment. The user can also use the control panel 14 to set the parameters of the measuring component 13 to make the measuring device suitable for measuring the air permeability of different papers.

[0025] With the above settings, the measuring device can detect the air permeability of the paper during the papermaking process, greatly shortening the measurement cycle of the paper. When the air permeability index of the paper is unqualified, the papermaking process can be adjusted in time, avoiding waste of paper resources. At the same time, during the papermaking process, the paper only needs to pass above the measuring surface 12 to be detected, without the need to sample the paper, and there is no risk of paper breakage. In addition, the measuring device measures the air permeability by negative pressure, and only the single-sided measuring surface 12 contacts the paper, making the measurement more convenient and safe.

[0026] As Figure 2 and Figure 3 shown, the measuring component 13 includes a microporous filter 131, an air permeability measuring piece 132, a Venturi tube 133, an air permeability automatic regulating valve 134, and an air permeability pressure detecting piece 135.

[0027] Specifically, one end of the microporous filter 131 is connected to the measuring hole 15, and the other end is connected to the air permeability measuring piece 132 and the air permeability pressure detecting piece 135. One end of the Venturi tube 133 is connected to the air permeability measuring piece 132, and the other end is connected to the air permeability automatic regulating valve 134.

[0028] Among them, the microporous filter 131 is used to filter the fibers and fillers dropped by the paper, preventing the fibers and fillers from entering the measuring component 13.

[0029] The air permeability measuring piece 132 measures the air permeability of the paper and transmits the air permeability of the paper to the control component.

[0030] The Venturi tube 133 is used to generate negative pressure, making the air flow from the paper direction to the measuring component 13. The negative pressure can not only make the paper fit tightly with the measuring surface 12, but also generate the air flow required for the air permeability measuring piece 132 to measure the air permeability of the paper.

[0031] The air permeability automatic regulating valve 134 can automatically adjust the air flow according to the preset pressure value.

[0032] The air permeability pressure detecting piece 135 can measure the negative pressure value generated in the Venturi tube 133.

[0033] As Figure 3 shown, the measuring device further includes a gas source regulating component 16; the gas source regulating component 16 is connected to the measuring component 13 and electrically connected to the control component, and is used to regulate the air flow entering the measuring component 13.

[0034] Specifically, the air source regulating assembly 16 includes a pneumatic switch valve 161, a pneumatic detector 162, an air filter 163, and a pneumatic regulating valve 164; one end of the pneumatic switch valve 161 is connected to the air permeability automatic regulating valve 134, and the other end is connected to the pneumatic detector 162; one end of the air filter 163 is connected to the pneumatic detector 162, and the other end is connected to the pneumatic regulating valve 164.

[0035] Among them, the pneumatic switch valve 161 can open or cut off the air flow passing through the measurement hole 15. Specifically, when the pneumatic switch valve 161 is open, the gas flows from the outside through the air source regulating assembly 16 to the measurement assembly 13; when passing through the Venturi tube 133, a negative pressure is generated inside the Venturi tube 133, so that the air above the measurement surface 12 flows through the measurement hole 15 to the Venturi tube 133. When the pneumatic switch valve 161 is closed, the generation of negative pressure inside the Venturi tube 133 stops, thus cutting off the air flow passing through the measurement hole 15.

[0036] The pneumatic detector 162 is used to detect the air pressure value flowing into the air source regulating assembly 16.

[0037] The air filter 163 is used to filter impurities in the gas flowing into the air source regulating assembly 16.

[0038] The pneumatic regulating valve 164 can adjust the air pressure value flowing into the air source regulating assembly 16 according to the preset air pressure parameters.

[0039] As Figure 1 shown, the measuring device further includes a photoelectric signal switch 17 for detecting whether there is a paper passing through the measurement surface 12. The photoelectric signal switch 17 is arranged on the front end face of the device frame 11 and at least partially arranged on the upper side of the measurement channel 111. Specifically, the photoelectric signal switch 17 is electrically connected to the control assembly. When it detects that there is a paper passing through the measurement channel 111, it outputs a start signal to the control assembly. When the control assembly receives the start signal, it opens the pneumatic switch valve 161 and starts the measurement assembly 13 to measure the air permeability of the paper.

[0040] As Figure 3 shown, an expansion slot 18 for adding the measurement hole 15 and the measurement assembly 13 is provided on the measurement surface 12, so as to arrange the number of the measurement holes 15 and the measurement assembly 13 to be increased or decreased according to the width of the paper, and improve the applicability of the measuring device.

[0041] A wear-resistant coating 121 is provided on the measurement surface 12 to improve the contact and durability between the measurement surface 12 and the paper.

[0042] A base 122 is provided at the bottom of the measurement surface 12. The base 122 is made of stainless steel to improve conductivity and durability.

[0043] In summary, the present application provides a device for measuring the air permeability of paper, which can measure the air permeability of paper during the paper-making process. The specific steps are as follows: The optoelectronic signal switch 17 detects whether there is paper passing through the measurement surface 12. If there is, the air pressure regulating valve 164 is activated, adjusted to the preset air pressure parameters, and the air pressure switch valve 161 is opened. According to the preset air pressure parameters of the air pressure regulating valve 164 and the air pressure parameters detected by the air permeability pressure detection component 135, the air flow rate automatically regulating valve 134 automatically adjusts the air flow rate flowing into the measurement assembly 13. Then, the air permeability measuring component 132 measures the air permeability of the paper and transmits the measurement result of the air permeability of the paper to the control component. The control component transmits the air permeability detection result to the control panel 14 for display. When paper breakage occurs or the measurement process is manually closed, the optoelectronic signal switch 17 detects that there is no paper passing through the measurement surface 12, and the control component controls the air pressure switch valve 161 to close and the air flow rate automatically regulating valve 134 to close, ending the measurement process.

[0044] The above is the description of the embodiments of the present invention. Through the above description of the disclosed embodiments, those skilled in the art can implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel points disclosed herein.

Claims

1. A paper air permeability measuring device, characterized in that: include: A device frame (11), wherein the device frame (11) is provided with a measurement channel (111) arranged along the front-rear direction; A measuring surface (12), the measuring surface (12) being arranged at the bottom of the measuring channel (111), the measuring surface (12) being provided with a plurality of measuring holes (15); the measuring holes (15) being arranged on the measuring surface (12) along a left-right direction; a measuring component (13), the measuring component (13) being arranged on the lower side of the measuring surface (12) and connected to the measuring hole (15), capable of generating negative pressure to adsorb the paper onto the measuring surface (12), and being used for measuring the air permeability of the paper; A control component, the control component being electrically connected to the measuring component (13); the measuring component (13) can transmit the air permeability measurement result of the paper to the control component.

2. The paper air permeability measuring device according to claim 1, characterized in that: The measuring assembly (13) comprises a microporous filter (131), an air permeability measuring element (132), a venturi tube (133), an automatic air permeability regulating valve (134), and an air permeability pressure detecting element (135); one end of the microporous filter (131) is connected to the measuring hole (15), and the other end is connected to the air permeability measuring element (132) and the air permeability pressure detecting element (135); one end of the venturi tube (133) is connected to the air permeability measuring element (132), and the other end is connected to the automatic air permeability regulating valve (134).

3. The paper air permeability measuring device according to claim 2, characterized in that: The measuring device further comprises an air source regulating component (16); the air source regulating component (16) is connected to the measuring component (13) and is electrically connected to the control component.

4. The paper air permeability measuring device according to claim 3, characterized in that: The air source regulating component (16) comprises an air pressure switch valve (161), an air pressure detection component (162), an air filter component (163) and an air pressure regulating valve (164); one end of the air pressure switch valve (161) is connected to the automatic air permeability regulating valve (134), and the other end is connected to the air pressure detection component (162); one end of the air filter component (163) is connected to the air pressure detection component (162), and the other end is connected to the air pressure regulating valve (164).

5. The paper air permeability measuring device according to claim 4, characterized in that: The measuring device further comprises a photoelectric signal switch (17) for detecting whether a sheet of paper passes through the measuring surface (12); the photoelectric signal switch (17) is arranged on the front end surface of the device frame (11), and at least partially arranged on the upper side of the measuring channel (111).

6. The paper air permeability measuring device according to claim 5, characterized in that: The photoelectric signal switch (17) is electrically connected to the control component, and when detecting that a paper has passed through the measuring channel (111), it outputs a start signal to the control component; when the control component receives the start signal, it opens the air pressure switch valve (161) and starts the measuring component (13) to measure the air permeability of the paper.

7. The paper air permeability measuring device according to claim 1, characterized in that: The measuring device further comprises a control panel (14); the control panel (14) is arranged on the left end surface or the right end surface of the device frame (11) and is electrically connected to the control component; the control component can transmit the air permeability measurement result to the control panel (14) so ​​as to display the air permeability measurement result.

8. The paper air permeability measuring device according to claim 1, characterized in that: An expansion slot (18) for adding the measuring hole (15) and the measuring component (13) is provided on the measuring surface (12).

9. The paper air permeability measuring device according to claim 1, characterized in that: The measuring surface (12) is provided with a wear-resistant coating (121).

10. The paper air permeability measuring device according to claim 1, characterized in that: A base (122) is provided at the bottom of the measuring surface (12); the base (122) is made of stainless steel.

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