CN111442986B - Method for detecting tensile property of cut tobacco - Google Patents
Method for detecting tensile property of cut tobacco Download PDFInfo
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- CN111442986B CN111442986B CN202010230281.5A CN202010230281A CN111442986B CN 111442986 B CN111442986 B CN 111442986B CN 202010230281 A CN202010230281 A CN 202010230281A CN 111442986 B CN111442986 B CN 111442986B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention discloses a method for detecting tensile property of cut tobacco, which comprises the following steps: clamping two ends of the tobacco shred and enabling the tobacco shred to be in a bent state; fixing the position of one end of the cut tobacco, and applying a pulling force far away from the fixed end of the cut tobacco to the movable end of the cut tobacco until the cut tobacco is completely straightened; continuously applying tension to the completely straightened tobacco shreds until the tobacco shreds are broken, acquiring tension F borne by the fixed ends of the tobacco shreds when the tobacco shreds are broken, and acquiring deformation quantity S of the tobacco shreds from complete straightening to breaking; and calculating the tensile elasticity of the cut tobacco according to the F/S. The tobacco shred tensile property detection method is high in accuracy and working efficiency, and can be used for rapidly and accurately detecting the tensile property of the tobacco shred.
Description
Technical Field
The invention relates to the field of tobacco shred performance detection, in particular to a method for detecting tensile property of tobacco shreds.
Background
The tobacco shreds are the raw materials for producing cigarettes, which are formed by cutting tobacco leaves. At present, cigarette industry enterprises mainly pay attention to the performance parameters of cut tobacco such as cut tobacco filling value, elasticity, cut tobacco finishing rate and moisture content, and the numerical values of the performance parameters directly influence the sensory quality and smoke release amount of cigarettes. However, the existing tobacco shred performance parameters cannot completely reflect the processing performance of the tobacco shred. During the cigarette rolling process, the tensile property of the tobacco shreds is found to have important influence on the applicability of the cigarette rolling machine.
Taking the tensile strength of the cut tobacco as an example, the greater the tensile strength of the cut tobacco is, the better the flexibility of the cut tobacco is, and the smaller the loss caused by the broken cut tobacco when the cigarette is rolled is, the processing performance of the cut tobacco can be reflected. The tensile property of the cut tobacco is an important factor for evaluating the processing property of the cut tobacco, the conventional detection of the tensile property of the cut tobacco mainly adopts manual stretching, and the defects of low accuracy, low working efficiency and the like exist through artificially and subjectively sensing the capability of the cut tobacco to bear external force.
Therefore, how to provide a method capable of rapidly and accurately detecting the tensile property of the cut tobacco becomes a technical problem which needs to be solved urgently in the field.
Disclosure of Invention
The invention aims to provide a novel technical scheme of a tobacco shred tensile property detection method capable of quickly and accurately detecting the tensile property of the tobacco shred.
According to a first aspect of the invention, a method for detecting tensile property of cut tobacco is provided.
The method for detecting the tensile property of the cut tobacco comprises the following steps:
clamping two ends of the tobacco shred and enabling the tobacco shred to be in a bent state;
fixing the position of one end of the cut tobacco, and applying a pulling force far away from the fixed end of the cut tobacco to the movable end of the cut tobacco until the cut tobacco is completely straightened;
continuously applying tension to the completely straightened tobacco shreds until the tobacco shreds are broken, acquiring tension F borne by the fixed ends of the tobacco shreds when the tobacco shreds are broken, and acquiring deformation quantity S of the tobacco shreds from complete straightening to breaking;
and calculating the tensile elasticity of the cut tobacco according to the F/S.
Optionally, the position of one end of the cut tobacco is fixed, and a pulling force far away from the fixed end of the cut tobacco is applied to the movable end of the cut tobacco until the cut tobacco is completely straightened, and the step is as follows:
fixing the position of one end of the tobacco shred;
the force application mechanism moving at a first speed applies a pulling force far away from the fixed end of the cut tobacco to the moving end of the cut tobacco, and obtains shape parameters of the cut tobacco, stress parameters of the fixed end of the cut tobacco and position parameters of the force application mechanism;
when the curvature of the tobacco shreds and the stress on the fixed end of the tobacco shreds are both 0, the tobacco shreds are completely straightened, and the position S of the force application mechanism when the tobacco shreds are completely straightened is obtained 0 。
Optionally, the step of applying a pulling force far away from the fixed end of the cut tobacco to the moving end of the cut tobacco by the force application mechanism moving at the first speed and acquiring the shape parameter, the stress parameter of the fixed end of the cut tobacco and the position parameter of the force application mechanism is as follows:
the force application mechanism moving at a first speed applies a pulling force far away from the fixed end of the cut tobacco to the moving end of the cut tobacco, and obtains shape parameters of the cut tobacco;
and when the curvature of the cut tobacco is reduced to a preset ratio of the curvature to the initial curvature, acquiring the stress parameter of the fixed end of the cut tobacco and the position parameter of the force application mechanism.
Optionally, the preset ratio is (0.5-1): 10.
Optionally, the step of continuously applying a pulling force to the fully straightened cut tobacco until the cut tobacco is pulled off to obtain a pulling force F on the cut tobacco fixed end when the cut tobacco is pulled off and a deformation amount S of the cut tobacco from being fully straightened to being pulled off is specifically as follows:
continuously applying tension to the completely straightened tobacco shreds by the force application mechanism moving at the second speed, and acquiring stress parameters of the fixed end of the tobacco shreds and position parameters of the force application mechanism;
when the cut tobacco is broken, the stress F of the fixed end of the cut tobacco and the position S of the force application mechanism are obtained f ；
According to S f -S 0 And (4) calculating the deformation quantity S of the tobacco shreds from complete extension to stretch-breaking.
Optionally, the second speed is less than the first speed.
Optionally, the method for detecting tensile property of tobacco shred further comprises the following steps:
obtaining a relation function of the tensile force and the deformation quantity of the tobacco shreds according to the stress parameter of the fixed end of the tobacco shreds and the position parameter of the force application mechanism;
acquiring a correction coefficient k according to a relation function of the tensile force applied to the tobacco shreds and the deformation of the tobacco shreds;
and correcting the tensile elasticity of the cut tobacco according to k multiplied by F/S.
Optionally, the step of obtaining the relation function between the tensile force applied to the tobacco shred and the deformation of the tobacco shred according to the stress parameter of the fixed end of the tobacco shred and the position parameter of the force applying mechanism is specifically as follows:
and performing linear fitting on the stress parameter of the fixed end of the tobacco shred and the position parameter of the force application mechanism to obtain a relation function F (t) = kS + b of the tensile force and the deformation of the tobacco shred, wherein b is a constant.
Optionally, the step of continuously applying a pulling force to the fully straightened cut tobacco until the cut tobacco is pulled off to obtain a pulling force F on the cut tobacco fixed end when the cut tobacco is pulled off and a deformation amount S of the cut tobacco from being fully straightened to being pulled off is specifically as follows:
continuously applying tension to the completely straightened tobacco shreds by the force application mechanism moving at the second speed, and acquiring stress parameters of the fixed end of the tobacco shreds, position parameters of the force application mechanism and image information of the tobacco shreds;
judging whether the quantity of the tobacco shreds is increased or not according to the image information of the tobacco shreds;
when the quantity of the cut tobacco is increased, the cut tobacco is broken, and the stress F of the fixed end of the cut tobacco and the position S of the force application mechanism are obtained when the cut tobacco is broken f ；
According to S f -S 0 And calculating the deformation quantity S of the tobacco shreds from complete extension to stretch-breaking.
Optionally, the length of the cut tobacco is greater than or equal to 10mm, and the thickness of the cut tobacco is 5mm-10mm.
The tobacco shred tensile property detection method is high in accuracy and working efficiency, and can be used for rapidly and accurately detecting the tensile property of the tobacco shred.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a flowchart of an embodiment of the method for detecting tensile property of cut tobacco according to the present disclosure.
Detailed Description
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 the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
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.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
As shown in FIG. 1, the method for detecting the tensile property of the cut tobacco disclosed by the invention comprises the following steps:
step S1: the two ends of the tobacco shred are clamped and the tobacco shred is in a bending state.
Step S2: and fixing the position of one end of the cut tobacco, and applying a pulling force far away from the fixed end of the cut tobacco to the movable end of the cut tobacco until the cut tobacco is completely straightened. One end of the cut tobacco with the fixed position is a cut tobacco fixed end, and the other end of the cut tobacco with the position changed relative to the cut tobacco fixed end is a cut tobacco moving end. The cut tobacco in the completely extended state is linear, and the fixed end of the cut tobacco is not under the action of the tension from the movable end of the cut tobacco.
And step S3: and continuously applying tension to the completely straightened cut tobacco until the cut tobacco is broken, acquiring tension F borne by the fixed end of the cut tobacco when the cut tobacco is broken, and acquiring deformation quantity S of the cut tobacco from complete straightening to breaking. The pulling force F that above-mentioned pipe tobacco stiff end received can be realized through modes such as setting up force sensor at pipe tobacco stiff end department. The deformation quantity S of the cut tobacco from being completely straightened to being pulled and broken can be realized by directly detecting the length change of the cut tobacco or by detecting the position change of a moving end of the cut tobacco.
And step S4: and calculating the tensile elasticity of the cut tobacco according to the F/S. The tensile elasticity of the tobacco shreds comprehensively considers the tensile strength and the tensile deformation capacity of the tobacco shreds, and the tensile property of the tobacco shreds can be well represented.
The method for detecting the tensile property of the cut tobacco is high in accuracy and working efficiency, and the tensile property of the cut tobacco can be quickly and accurately detected.
In an embodiment of the method for detecting tensile property of cut tobacco disclosed herein, step S2 may specifically be as follows:
step S21: the position of one end of the tobacco shred is fixed.
Step S22: the force application mechanism moving at the first speed applies a pulling force far away from the fixed end of the cut tobacco to the moving end of the cut tobacco, and obtains shape parameters of the cut tobacco, stress parameters of the fixed end of the cut tobacco and position parameters of the force application mechanism. The force applying mechanism may be, for example, a linear motor or a piston. The shape parameters of the cut tobacco can comprise the curvature of the cut tobacco, the length change of the cut tobacco and other parameters. The stress parameter of the cut tobacco fixed end generally refers to the value of the tensile force applied to the cut tobacco fixed end. The position parameter of the forcing mechanism may be, for example, coordinate data of the forcing mechanism.
Step S23: when the curvature of the tobacco shreds and the stress on the fixed end of the tobacco shreds are both 0, the tobacco shreds are completely straightened, and the position S of the force application mechanism when the tobacco shreds are completely straightened is obtained 0 . The position of the force applying mechanism changes when the force applied to the fixed end of the cut tobacco changes from 0 to a detectable initial valueThe method has certain hysteresis, and in order to avoid the problem that the tensile property of the cut tobacco is inaccurate due to the hysteresis, the curvature data of the cut tobacco is obtained through the shape parameters of the cut tobacco, so that whether the cut tobacco is completely straightened or not is judged more accurately, and the tensile property of the cut tobacco is detected more accurately. Position S of force application mechanism when tobacco shred is completely straightened 0 Also referred to as the initial position.
Further, step S22 is specifically as follows:
step S22-1: and the force application mechanism moving at the first speed applies a pulling force far away from the fixed end of the cut tobacco to the moving end of the cut tobacco, and obtains the shape parameters of the cut tobacco.
Step S22-2: and when the curvature of the cut tobacco is reduced to a preset ratio of the curvature to the initial curvature, acquiring the stress parameter of the fixed end of the cut tobacco and the position parameter of the force application mechanism.
The initial curvature is the curvature of the cut tobacco in the curved state in step S1. The preset ratio can be flexibly selected according to actual requirements. The time for acquiring the shape parameters of the cut tobacco and the time for acquiring the stress parameters of the fixed end of the cut tobacco and the position parameters of the force application mechanism are adjusted to be different, so that whether the cut tobacco is completely straightened or not can be judged more accurately.
Further, the predetermined ratio is (0.5-1): 10. That is, the ratio of the curvature of the cut tobacco to the initial curvature is (0.5-1): 10.
Further, step S3 is specifically as follows:
step S31: and the force application mechanism moving at the second speed continuously applies pulling force to the completely straightened cut tobacco, and obtains the stress parameter of the fixed end of the cut tobacco and the position parameter of the force application mechanism.
Step S32: when the cut tobacco is broken, the stress F of the fixed end of the cut tobacco and the position S of the force application mechanism are obtained f 。
Step S33: according to S f -S 0 And (4) calculating the deformation quantity S of the tobacco shreds from complete extension to stretch-breaking. The deformation quantity S of the cut tobacco from complete extension to stretch-breaking is obtained through the position change of the force application mechanism, and the deformation quantity S of the cut tobacco is more accurately obtained.
Furthermore, in order to more accurately acquire the stress parameter of the fixed end of the cut tobacco and the position parameter of the force application mechanism, the second speed is lower than the first speed.
Furthermore, in order to obtain more accurate tensile property of the cut tobacco, the method for detecting the tensile property of the cut tobacco further comprises the following steps:
step S5: and obtaining a relation function of the tensile force and the deformation quantity of the tobacco shreds according to the stress parameter of the fixed end of the tobacco shreds and the position parameter of the force application mechanism.
Step S6: and obtaining the correction coefficient k according to the relation function of the tensile force and the deformation of the tobacco shreds.
Step S7: and correcting the tensile elasticity of the cut tobacco according to k multiplied by F/S.
In specific implementation, step S5 is specifically as follows:
and performing linear fitting on the stress parameter of the fixed end of the tobacco shred and the position parameter of the force application mechanism to obtain a relation function F (t) = kS + b of the tensile force and the deformation of the tobacco shred, wherein b is a constant.
Further, step S3 is specifically as follows:
step S31: and the force application mechanism moving at the second speed continuously applies pulling force to the completely straightened cut tobacco, and obtains the stress parameter of the fixed end of the cut tobacco, the position parameter of the force application mechanism and the image information of the cut tobacco. The image information of the tobacco shreds can be obtained by analyzing the photos of the tobacco shreds and can include information such as the quantity of the tobacco shreds.
Step S32: and judging whether the quantity of the tobacco shreds is increased or not according to the image information of the tobacco shreds.
Step S33: when the quantity of the cut tobacco is increased, the cut tobacco is broken, and the stress F of the fixed end of the cut tobacco and the position S of the force application mechanism are obtained when the cut tobacco is broken f 。
Step S34: according to S f -S 0 And (4) calculating the deformation quantity S of the tobacco shreds from complete extension to stretch-breaking.
In the embodiment, the quantity change of the cut tobacco is judged according to the image information of the cut tobacco, so that whether the cut tobacco is broken or not and the time node of the broken cut tobacco are judged more accurately, and more accurate cut tobacco acquisition is facilitatedForce F on the fixed end and position S of the force application mechanism f 。
In one embodiment of the method for detecting the tensile property of the cut tobacco, in order to improve the accuracy of the detection of the tensile property of the cut tobacco, the length of the cut tobacco is greater than or equal to 10mm, and the thickness of the cut tobacco is 5mm-10mm.
In addition, in order to further improve the accuracy of the detection of the tensile property of the cut tobacco, the cut tobacco can be subjected to the following processing before detection: and balancing for 24-48 h at 21-23 deg.C and 57% -63% relative humidity.
Although some specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (7)
1. The method for detecting the tensile property of the cut tobacco is characterized by comprising the following steps of:
clamping two ends of the tobacco shred and enabling the tobacco shred to be in a bent state;
fixing the position of one end of the cut tobacco, and applying a pulling force far away from the fixed end of the cut tobacco to the movable end of the cut tobacco until the cut tobacco is completely straightened;
continuously applying tension to the completely straightened tobacco shreds until the tobacco shreds are broken, acquiring tension F borne by the fixed ends of the tobacco shreds when the tobacco shreds are broken, and acquiring deformation quantity S of the tobacco shreds from complete straightening to breaking;
calculating the tensile elasticity of the cut tobacco according to the F/S;
the method is characterized in that the position of one end of the cut tobacco is fixed, a pulling force far away from the fixed end of the cut tobacco is applied to the movable end of the cut tobacco until the cut tobacco is completely straightened, and the method comprises the following steps:
fixing the position of one end of the tobacco shred;
the force application mechanism moving at a first speed applies a pulling force far away from the fixed end of the cut tobacco to the moving end of the cut tobacco, and obtains shape parameters of the cut tobacco, stress parameters of the fixed end of the cut tobacco and position parameters of the force application mechanism;
when the curvature of the tobacco shreds and the stress on the fixed end of the tobacco shreds are both 0, the tobacco shreds are completely straightened, and the position S of the force application mechanism when the tobacco shreds are completely straightened is obtained 0 ；
The method comprises the following steps of continuously applying a pulling force on the completely straightened cut tobacco until the cut tobacco is broken, acquiring a pulling force F borne by a cut tobacco fixed end when the cut tobacco is broken, and acquiring a deformation quantity S of the cut tobacco from complete straightening to breaking, wherein the steps are as follows:
the force application mechanism moving at the second speed continuously applies pulling force to the completely straightened cut tobacco, and obtains the stress parameter of the fixed end of the cut tobacco and the position parameter of the force application mechanism;
when the cut tobacco is broken, the stress F of the fixed end of the cut tobacco and the position S of the force application mechanism are obtained f ；
According to S f -S 0 Calculating the deformation quantity S of the cut tobacco from complete extension to stretch-breaking; or
The method comprises the following steps of continuously applying a pulling force on the completely straightened cut tobacco until the cut tobacco is broken, acquiring a pulling force F borne by a cut tobacco fixed end when the cut tobacco is broken, and acquiring a deformation quantity S of the cut tobacco from complete straightening to breaking, wherein the steps are as follows:
the force application mechanism moving at the second speed continuously applies pulling force to the completely straightened cut tobacco, and obtains the stress parameter of the fixed end of the cut tobacco, the position parameter of the force application mechanism and the image information of the cut tobacco;
judging whether the quantity of the tobacco shreds is increased or not according to the image information of the tobacco shreds;
when the quantity of the cut tobacco is increased, the cut tobacco is broken, and the stress F of the fixed end of the cut tobacco and the position S of the force application mechanism are obtained when the cut tobacco is broken f ；
According to S f -S 0 And (4) calculating the deformation quantity S of the tobacco shreds from complete extension to stretch-breaking.
2. The tobacco shred tensile property detection method according to claim 1, wherein the step of applying a pulling force far away from the tobacco shred fixed end to the moving end of the tobacco shred by the force application mechanism moving at the first speed and acquiring the shape parameter, the stress parameter and the position parameter of the force application mechanism of the tobacco shred fixed end comprises the following specific steps:
the force application mechanism moving at a first speed applies a pulling force far away from the fixed end of the cut tobacco to the moving end of the cut tobacco, and obtains shape parameters of the cut tobacco;
and when the curvature of the cut tobacco is reduced to a preset ratio of the curvature to the initial curvature, acquiring the stress parameter of the fixed end of the cut tobacco and the position parameter of the force application mechanism.
3. The tobacco shred tensile property detection method according to claim 2, wherein the preset ratio is (0.5-1): 10.
4. The method for detecting tensile property of tobacco shred according to claim 1, wherein the second speed is lower than the first speed.
5. The tobacco shred tensile property detection method according to claim 1, further comprising the following steps:
obtaining a relation function of the tensile force and the deformation quantity of the tobacco shreds according to the stress parameter of the fixed end of the tobacco shreds and the position parameter of the force application mechanism;
acquiring a correction coefficient k according to a relation function of the tensile force applied to the tobacco shreds and the deformation of the tobacco shreds;
and correcting the tensile elasticity of the cut tobacco according to k multiplied by F/S.
6. The tobacco shred tensile property detection method according to claim 5, wherein the step of obtaining the relation function of the tensile force and the tobacco shred deformation quantity of the tobacco shred according to the stress parameter of the fixed end of the tobacco shred and the position parameter of the force application mechanism is as follows:
and performing linear fitting on the stress parameter of the fixed end of the tobacco shred and the position parameter of the force application mechanism to obtain a relation function F (t) = kS + b of the tensile force and the deformation of the tobacco shred, wherein b is a constant.
7. The cut tobacco tensile property detection method according to any one of claims 1 to 6, wherein the length of the cut tobacco is greater than or equal to 10mm, and the thickness of the cut tobacco is 5mm-10mm.
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| CN202433166U (en) * | 2011-11-30 | 2012-09-12 | 长城汽车股份有限公司 | Modulus of elasticity measuring device for spring |
| CN103376192A (en) * | 2012-04-19 | 2013-10-30 | 鸿富锦精密工业（深圳）有限公司 | Spring detection device |
| CN104502041A (en) * | 2014-12-15 | 2015-04-08 | 贵州黎阳航空动力有限公司 | Device and method for detecting elasticity of elastic ring parts for aeroengine |
| CN204389155U (en) * | 2015-01-30 | 2015-06-10 | 安徽江淮汽车股份有限公司 | A kind of measurement mechanism of spring |
| CN206396425U (en) * | 2016-11-14 | 2017-08-11 | 苏州大学 | A kind of organizine break detector apparatus and the edge machine provided with organizine break detector apparatus |
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