CN220288524U - Cigarette length, circumference, roundness and cylindricity measuring device based on machine vision - Google Patents
Cigarette length, circumference, roundness and cylindricity measuring device based on machine vision Download PDFInfo
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- 235000019504 cigarettes Nutrition 0.000 title claims abstract description 171
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- 238000007599 discharging Methods 0.000 claims description 27
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- 239000007924 injection Substances 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 15
- 230000000903 blocking effect Effects 0.000 claims description 6
- 235000019506 cigar Nutrition 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
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- 239000000919 ceramic Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The utility model provides a cigarette length, circumference, roundness and cylindricity measuring device based on machine vision, which comprises a measuring device: the sampling unit is used for receiving cigarettes to be measured in batches and outputting the cigarettes to the sampling unit one by one; the sample feeding unit is used for receiving and fixing the cigarettes output by the sample feeding unit, and driving the cigarettes to rotate to a detection position right below the detection assembly; measuring the surface contour of the cigarette positioned at the detection position by using a detection unit to obtain axial and circumferential contour data of the cigarette; and unloading the sample of the cigarettes subjected to detection by using a sample unloading unit. The utility model can be applied to the measurement of the length, circumference, roundness and cylindricity of columnar products including cigarettes, and breaks through the bottleneck of single detection mode, complex operation and insufficient instrument performance in the field of physical quality detection of cigarettes at the present stage.
Description
Technical Field
The utility model relates to a measuring device, in particular to a cigarette length, circumference, roundness and cylindricity measuring device based on machine vision.
Background
Roundness refers to the degree to which the cross section of a workpiece approaches a theoretical circle. In length metering techniques, roundness is typically expressed in terms of roundness error. When the difference between the maximum radius and the minimum radius is 0, the roundness is 0, which means "the most round". Common roundness measuring methods are a rotation axis method, a three-point method, a two-point method, a projection method, a coordinate method and the like. According to different measuring methods, common measuring instruments include roundness measuring instruments, micrometer, projector, three-coordinate measuring machine with electronic computer, etc. The roundness error is evaluated by 4 methods, namely a minimum area method, a least square method, a minimum circumscribing method and a maximum inscribing method.
The cylindricity refers to the condition that each point on the outline of the cylindrical surface on the workpiece keeps equidistant to the axis, and is the combination of the roundness of the cylinder and the linearity of the element line. In length metering techniques, cylindricity is generally expressed in terms of cylindricity errors. The cylindricity error comprises errors in two aspects of an axial section and a transverse section, and the radial distance between two coaxial cylindrical surfaces is the cylindricity error. If a plurality of cross sections need to be measured, taking the half of the difference value between the maximum indication value and the minimum indication value in all indication values read from each cross section as the cylindricity error of the cylinder to be measured. Typically, the cylindricity error is measured with a roundness measuring instrument or a three-coordinate measuring device equipped with a computer.
In recent years, with the high-speed development of automatic cigarette production technology and the continuous improvement of production management informatization, each cigarette production enterprise has put forward higher demands on cigarette rolling quality. The length, circumference, roundness and cylindricity of the cigarettes are important indexes for evaluating the rolling quality of the cigarettes, and whether the indexes are qualified or not is not only related to the production efficiency of enterprises, but also related to the competitiveness of cigarette products in terminal markets. Currently, most cigarette manufacturers focus on measurement of cigarette length and circumference in evaluation of cigarette rolling quality, but little attention is paid to cigarette roundness and cylindricity, and few reports are published on special measuring instruments for cigarette roundness and cylindricity. In addition, the measuring instrument of cigarette length and circularity that each enterprise used at present is mostly split type, either survey length before survey circumference, or survey circumference before survey length, and measurement process complex operation takes time and labor. Therefore, the establishment of an efficient and high-performance measuring device for synchronously measuring the length, circumference, roundness and cylindricity of cigarettes is particularly important for cigarette manufacturers and quality supervision and inspection departments.
Disclosure of Invention
The utility model aims to solve the technical problems, and provides a cigarette length, circumference, roundness and cylindricity measuring device based on machine vision, which can be applied to measuring the length, circumference, roundness and cylindricity of columnar products including cigarettes, and breaks through the bottlenecks of single detection mode, complex operation and insufficient instrument performance in the field of physical quality detection of cigarettes at the present stage.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a machine vision based cigarette length, circumference, roundness and cylindricity measuring apparatus comprising:
the sample feeding unit is used for receiving cigarettes to be measured in batches, outputting the cigarettes to the sample feeding unit one by one, and the output cigarettes are in an inverted posture with filter tips facing downwards;
the sample feeding unit receives and fixes cigarettes output by the sample feeding unit through sample holders, the plurality of sample holders are arranged on a sample feeding disc at equal intervals along the circumferential direction, the sample feeding disc is driven by a pulse motor and can rotate around the central axis of the disc body, any sample holder can synchronously rotate to the position right below a discharge port of the sample feeding unit along with the sample feeding disc, a gap is vertically reserved between the top end and the discharge port of the sample feeding unit, the filter tip end of each cigarette is connected with the received cigarette, and the sample holder can move to a detection position right below a detection assembly along with the continuous rotation of the sample feeding disc;
the detecting unit is used for measuring the surface profile of the cigarette positioned at the detecting position and comprises a detecting cabin, the detecting cabin is suspended above the detecting position at first, an electric telescopic push rod is driven to move downwards to cover the outside of the cigarette positioned at the detecting position, a first profile sensor is arranged in the middle of the top end of the cabin, a circle of annular electric sliding rail is arranged on the inner peripheral wall of the cabin in a surrounding mode, a second profile sensor is arranged on the electric sliding rail, the detecting assembly is used for measuring along the central axis direction of the cigarette by using the first profile sensor and obtaining axial profile data of the cigarette, and the second profile sensor is used for measuring along the electric sliding rail around the cigarette for a circle and obtaining circumferential profile data of the cigarette;
and the sample unloading unit is used for unloading the cigarettes at the detection position after the detection is completed.
The utility model is also characterized in that:
the device also comprises a data acquisition and processing assembly, a data acquisition device and a computer, wherein the data acquisition and processing assembly comprises a signal controller and a computer and is used for automatically controlling a sample injection unit, a sample delivery unit, a detection unit and a sample unloading unit, and the data acquisition device is used for acquiring measurement data of a first contour sensor and a second contour sensor and sending the measurement data to the computer for calculation processing.
The sample feeding hopper is of a prismatic table-shaped shell structure with an open top end and serving as a feeding hole and a discharge hole at the bottom end, the small end of the sample feeding hopper is downward, the sample feeding hopper is sequentially connected with the feeding section and the discharge section from the discharge hole downwards to form a through vertical discharge channel, the first discharge gate is arranged between the discharge hole of the sample feeding hopper and the upper hole of the feeding section and used for controlling the opening/closing of the discharge hole of the sample feeding hopper, the second discharge gate is arranged at the bottom end part of the discharge section and used for controlling the opening/closing of the lower end part of the discharge section, the vertical distance between the second discharge gate and the lower hole of the discharge section is smaller than the length of a single vertical cigarette, and the lower hole of the discharge section is used as the discharge hole of the sample feeding unit;
the guide section is of a square column-shaped shell structure, the width of the guide section can only accommodate a single cigarette to be put in a horizontal and straight posture, a gap is reserved between the guide section and two ends of the cigarette, the left side wall and the right side wall of the guide section are parallel to the opening and closing direction of the first discharge gate, the upper end part of the left side wall is provided with a posture adjusting block for guiding the center of the guide section to be outwards protruded, the sample feeding hopper is provided with an indicating arrow for prompting the placement direction of the cigarette, and the direction pointed by the indicating arrow is perpendicular to the opening and closing direction of the first discharge gate and is arranged towards the outwards protruded direction of the posture adjusting block;
the discharging section is of a long tubular structure, the outer diameter is smaller than the width of the guiding section, and the inner diameter can accommodate the placement of cigarettes in a single vertical posture;
the first discharging gate and the second discharging gate are all electric gates, and when one gate is in an open state, the other gate is in a closed state, and only one gate is always kept open.
In the sample feeding unit, the pulse motor and the sample feeding disc are driven by a gear transmission mechanism.
In the sample feeding unit, the sample holder is a columnar body made of electromagnetic wave blocking materials, and the middle part of the top end surface is coated with self-adhesive.
In the detection unit, the detection cabin is made of electromagnetic wave blocking materials, and the opening end of the detection cabin faces downwards.
The sample unloading unit is an electric swing rod and comprises a rotation driving device and a swing rod, the rotation driving device is used for driving the swing in a horizontal plane, the central axis of the power output shaft is vertical, the swing rod body is horizontal and driven by the rotation driving device, the sample unloading unit can rotate around the central axis of the power output shaft in the horizontal plane, and the sample unloading unit can be contacted with a cigarette on a sample holder of the detection position when swinging to the detection position.
The device also comprises a supporting table, wherein the sample feeding unit, the sample delivering unit, the detecting unit, the sample unloading unit and the data acquisition and processing assembly are arranged on the supporting table; the supporting table is also provided with a sample collecting barrel for collecting cigarettes unloaded by the sample unloading unit.
The cigarette types comprise flue-cured cigarettes, mixed cigarettes, machine-made cigars, manual cigars, heating non-combustible cigarettes and cigarette filter sticks.
The first contour sensor and the second contour sensor are CCD contour scanning sensors or laser contour scanning sensors.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model sequentially completes sample injection, sample delivery, detection and sample unloading of the cigarette to be detected by using the sample injection unit, the sample delivery unit, the detection unit and the sample unloading unit, has clear and simple measurement process, can be applied to simultaneous measurement of the length, circumference, roundness and cylindricity of the cigarette and other columnar objects by using the first contour sensor and the second contour sensor in the detection process, has wide application range, has high acquired data dimension and high precision, is non-contact measurement, does not damage the surface of the measured object, is friendly to the measured object with softer texture, can realize nondestructive measurement, and can be repeatedly used after the sample measurement is completed.
Drawings
FIG. 1 is a schematic illustration of a cigarette contour mapping and three-dimensional contour body cross-section segmentation process;
FIG. 2 is a schematic diagram of calculation of a theoretical circle radius and a maximum inscribed circle radius of an approximate circle of any cross section of a three-dimensional profile of a cigarette;
FIG. 3 is an exemplary diagram of an apparatus of the present utility model;
FIG. 4 is a schematic diagram of the sample injection unit in FIG. 3;
FIG. 5 is a schematic view of a portion of the sample presentation unit of FIG. 3;
fig. 6 is a schematic cross-sectional view of the inspection chamber of fig. 3.
In the figure:
1, a sample injection unit; 11 sample feed hoppers; 12 indicates an arrow; 13 a material guiding section; 14, an attitude adjusting block; 15, a discharging section; 16 a first discharge gate; 17 a second discharge gate;
2, a sample feeding unit; a 21 pulse motor; a 22 gear transmission mechanism; 23 sample holders; 24 sample feeding discs;
3 a detection unit; 31 electric telescopic push rod; 32 detection cabin; a first profile sensor 33; 34 a second profile sensor; 35 electric slide rail;
4, swinging rods;
a 51 signal controller; 52 a data collector; 53 computers;
6, supporting a table; 61 sample collection barrels;
7 cigarettes.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described in the following in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 3 and 6, the device for measuring the length, circumference, roundness and cylindricity of a cigarette based on machine vision in this embodiment includes:
the sample injection unit 1 is used for receiving cigarettes 7 to be measured in batches, outputting the cigarettes to the sample injection unit 2 one by one, and the cigarettes 7 are in an inverted posture with filter tips facing downwards;
the sample feeding unit 2 receives and fixes the cigarettes 7 output by the sample feeding unit 1 through sample holders 23, the plurality of sample holders 23 are circumferentially and equidistantly arranged on a sample feeding disc 24 at intervals, the sample feeding disc 24 is driven by a pulse motor 21 and can rotate around the central axis of the disc body, any sample holder 23 can synchronously rotate to the position right below the discharge port of the sample feeding unit 1 along with the sample feeding disc 24, a vertical gap is reserved between the top end and the discharge port of the sample feeding unit 1, the filter tip end of each cigarette 7 is connected with the received cigarettes 7, and the sample holders can be displaced to a detection position right below the detection assembly along with the continuous rotation of the sample feeding disc 24;
the detecting unit 3 is used for measuring the surface contour of the cigarette 7 positioned at the detecting position, and comprises a detecting cabin 32, wherein the detecting cabin 32 is suspended above the detecting position at first, an electric telescopic push rod 31 drives the cigarette 7 to move downwards to cover the detecting position, a first contour sensor 33 is arranged in the middle of the top end of the cabin, a circle of annular electric sliding rail 35 is arranged on the peripheral wall of the cabin in a surrounding manner, a second contour sensor 34 is arranged on the electric sliding rail 35, the detecting assembly is used for measuring along the central axis direction of the cigarette 7 by using the first contour sensor 33, and is used for obtaining axial contour data of the cigarette 7, and the second contour sensor 34 is used for measuring along the electric sliding rail 35 around the cigarette 7 for a circle and is used for obtaining circumferential contour data of the cigarette 7;
and the sample unloading unit is used for unloading the cigarettes 7 at the detection position after the detection is completed.
The device is further provided with:
the device also comprises a data acquisition and processing component, wherein the data acquisition and processing component comprises a signal controller 51 and a computer 53 and is used for automatically controlling the sample feeding unit 1, the sample sending unit 2, the detection unit 3 and the sample unloading unit, and the device also comprises a data acquisition device 52 which is used for acquiring measurement data of the first contour sensor 33 and the second contour sensor 34 and sending the measurement data to the computer 53 for calculation processing.
The sample injection unit 1 is an automatic sample injector, and the structure is set as follows:
the device comprises a sample feeding hopper 11, a material guiding section 13, a material discharging section 15, a first material discharging gate 16 and a second material discharging gate 17, wherein the sample feeding hopper 11 is of a prismatic table-shaped shell structure with an open top end and used as a material inlet and a material discharging hole formed in the bottom end, the small end faces downwards, the material discharging hole is sequentially connected with the material guiding section 13 and the material discharging section 15 downwards to form a through vertical material discharging channel, the first material discharging gate 16 is arranged between the material discharging hole of the sample feeding hopper 11 and the upper opening of the material guiding section 13 and used for controlling the opening/closing of the material discharging hole of the sample feeding hopper 11, the second material discharging gate 17 is arranged at the bottom end of the material discharging section 15 and used for controlling the opening/closing of the lower end of the material discharging section 15, the vertical distance between the second material discharging gate 17 and the lower opening of the material discharging section 15 is smaller than the length of a single vertical cigarette 7, and the lower opening of the material discharging section 15 is used as the material discharging hole of the sample feeding unit 1;
the guide section 13 is of a square column-shaped shell structure, the width of the guide section 13 can only accommodate a single cigarette 7 to be put in a horizontal and straight posture, a gap is reserved between the guide section and two ends of the cigarette 7, the left side wall and the right side wall of the guide section 13 are parallel to the opening and closing direction of the first discharge gate 16, the upper end part of the left side wall is provided with a posture regulating block 14 which points to the center of the guide section 13 to be outwards protruded, the sample feeding hopper 11 is provided with an indicating arrow 12 which is used for prompting the placement direction of the cigarette 7, and the direction pointed by the indicating arrow 12 is perpendicular to the opening and closing direction of the first discharge gate 16 and is arranged towards the outwards protruded direction of the posture regulating block 14;
the discharging section 15 is of a long tubular structure, the outer diameter is smaller than the width of the guiding section 13, and the inner diameter can accommodate the cigarettes 7 in a single vertical posture;
the first discharging gate 16 and the second discharging gate 17 are electric gates, and when one gate is in an open state, the other gate is in a closed state, and only one gate is always kept open.
Before sample injection, the opening of a discharge hole of a sample feed hopper 11 is adjusted through a first discharge gate 16, so that cigarettes 7 in a single horizontal and straight posture can be only accommodated to pass through, at the moment, a second discharge gate 17 is kept closed, during sample injection, the filter tip ends of the cigarettes 7 to be measured in batches are aligned by an operator, the cigarettes 7 to be fed into the sample feed hopper 11 in the horizontal and straight posture, the filter tip ends face to the direction indicated by an indication arrow 12, fall into a material guide section 13 one by one through the first discharge gate 16, continuously fall under the action of dead weight and collide with a posture adjusting block 14, the cigarettes 7 are turned downwards under the action of the dead weight and continuously fall into a discharge section 15 in the downward vertical posture of the filter tip, when the cigarettes reach the lower end position of the discharge section 15, the second discharge gate 17 is opened, the first discharge gate 16 is closed, and the cigarettes 7 fall down through the discharge section 15 and are received by a sample holder 23 under the dead weight; each cigarette 7 in the sample feeding hopper 11 repeats the above operation and is output to the sample feeding unit 2 one by one.
In the sample feeding unit 2, the pulse motor 21 may be of an electromechanical type, a magneto-electric type, a linear type, or the like, and is driven by the sample feeding plate 24 through the gear transmission mechanism 22. The sample holder 23 is a columnar body made of electromagnetic wave blocking materials such as metal, ceramic and the like, the middle part of the top end surface is coated with adhesive which can be used repeatedly, and the cigarette 7 which is output from the sample feeding unit 1 and falls down is adhered and fixed by using the viscosity of the adhesive, so that the filter tip end is kept in a downward vertical posture.
In the detection unit 3, the opening end of the detection cabin 32 is downward, so as to effectively avoid electromagnetic waves emitted by all contour sensors inside the detection cabin 32 from overflowing out of the cabin, and the detection cabin 32 can be made of electromagnetic wave blocking materials such as metal, ceramic and the like. The detection cabin 32 is suspended above the detection position at first, and the electric telescopic push rod 31 drives the detection cabin 32 or descends under the control of the signal controller 51 until the detection position cigarette 7 is completely covered inside, so as to measure the surface profile data of the cigarette 7 or ascend and reset after the measurement is completed.
The sample unloading unit is an electric swing rod 4 made of metal, plastic or rubber, and the cigarettes 7 on the sample holder 23 are swept down through the swing of the swing rod 4, so that the cigarettes are separated from the sample holder 23 and fall down. The electric swing rod 4 comprises a swing driving device and a swing rod 4, the swing driving device is used for driving the swing in the horizontal plane, the central axis of a power output shaft of the swing driving device is vertical, the rod body of the swing rod 4 is horizontal, the swing rod is driven by the swing driving device to swing in the horizontal plane around the central axis of the power output shaft, the swing rod can be contacted with the cigarette 7 on the sample holder 23 at the detection position when swinging to the detection position, and the sweeping of the cigarette 7 is formed along with the continuation of the swing, so that the unloading of the cigarette 7 at the detection position after the detection is completed.
The rotary driving device can be a motor, an output shaft of the motor is used as a power output shaft, one end of the swing rod 4 is sleeved on the output shaft of the motor through a sleeve, and the rod body is arranged along the radial direction of the sleeve and fixedly connected with the outer wall of the sleeve.
The sample unloading device further comprises a supporting table 6, and the sample feeding unit 1, the sample feeding unit 2, the detection unit 3, the sample unloading unit and the data acquisition processing assembly are arranged on the supporting table 6. The support table 6 is also provided with a sample collection barrel 61 for collecting cigarettes 7 unloaded by the sample unloading unit.
The measuring device can be applied to the measurement of the length, circumference, roundness and cylindricity of various columnar products such as flue-cured cigarettes, mixed cigarettes, machine-made cigars, manual cigars, heating incombustible cigarettes, filter sticks for cigarettes and the like.
The first contour sensor and the second contour sensor may be non-contact contour scanning sensors such as CCD contour scanning sensor and laser contour scanning sensor.
Referring to fig. 1 and 2, based on the above device, the present embodiment further provides a corresponding method for measuring the length, circumference, roundness and cylindricity of a cigarette based on machine vision, which includes the following steps:
step 1, establishing a three-dimensional profile body of a cigarette
Measuring the surface profile of the cigarette to be measured by using a first profile sensor and a second profile sensor, and drawing a three-dimensional profile body of the cigarette to be measured according to the measurement result; the measurement result comprises axial profile data obtained by measuring the first profile sensor along the central axis direction of the cigarette and circumferential profile data obtained by measuring the second profile sensor along the circumferential direction around the cigarette;
step 2, calculating the length of the cigarettes
Calculating the maximum axial distance L between two end surfaces of the three-dimensional profile body by using an image recognition algorithm, namely the length L of the cigarette;
step 3, calculating the circumference of the cigarette
Using an image segmentation algorithm to perform a cross-sectional decomposition on the three-dimensional contour body along the direction perpendicular to the axis of the three-dimensional contour body to obtain n cross-section approximate circles, and using an image recognition algorithm to calculate the circumference C of each cross-section approximate circle i The circumference C of the cigarette is calculated by the formula (1):
in the formula (1), C is the circumference of a cigarette, and the unit is mm; c (C) i The circumference of a circle is approximated to a certain cross section of the three-dimensional contour body, and the unit is mm;
step 4, calculating the roundness of the cigarettes
Approximating a circle with any cross section of the three-dimensional profile body, approximating the circumference C of the circle with the cross section i Under certain conditions, making theoretical circle, and identifying by imageAlgorithm identification and calculation of radius r of theoretical circle Ti Simultaneously, the maximum inscribed circle of the cross section approximate circle is made, and the radius r of the maximum inscribed circle is identified and calculated by utilizing an image identification algorithm Mi The roundness O of the cigarette is calculated according to the formula (2):
in the formula (2), O is the roundness of the cigarette; r is (r) Mi The radius of the largest inscribed circle of any cross section approximate circle of the three-dimensional contour body is expressed in mm; r is (r) Ti The radius of a theoretical circle which is any cross section approximate circle of the three-dimensional contour body is expressed in mm;
step 5, calculating the cylindricity of the cigarettes
Aiming at all cross section approximate circles of the three-dimensional contour body obtained by the cleavage in the step 3, the radius r of the largest inscribed circle is identified and calculated by utilizing an image identification algorithm Mi Maximum value (r) Mi ) max And minimum value (r Mi ) min Calculating the cylindricity phi of the cigarette according to the formula (3):
in the formula (3), phi is the cylindricity of the cigarette; (r) Mi ) max Sum (r) Mi ) min The maximum value and the minimum value in the maximum inscribed circle radius of all cross section approximate circles of the three-dimensional outline body are respectively expressed in mm; o is the roundness of the cigarette.
Taking the measurement of the length, circumference, roundness and cylindricity of a conventional flue-cured tobacco type cigarette (84×24.4mm (84 mm length, 24.4mm circumference)) of Huangshan brand as an example, the following steps are sequentially carried out according to the measurement procedure by using the device:
(1) The device starts: checking whether each unit is intact, starting a power supply, and confirming whether each unit operates normally;
(2) And (3) sample injection: putting cigarettes to be tested into a sample injection unit in batches, dispersing the cigarettes by the sample injection unit and outputting the cigarettes to the sample injection unit one by one;
(3) Sample feeding: the signal controller controls the pulse motor to operate and drives the sample feeding disc to rotate, the rotating sample feeding disc sequentially receives cigarettes which are output by the sample feeding unit one by one through each sample holder, and each sample holder holding the cigarettes moves to the detection position one by one along with the continuous rotation of the sample feeding disc;
(4) And (3) data acquisition: after a sample holder holding a cigarette moves to a detection position, a signal controller controls an electric telescopic push rod to extend downwards to drive a detection cabin to descend to cover the outside of the sample holder, at the moment, a second contour sensor bypasses the periphery of the cigarette along an electric sliding rail for continuous scanning and mapping of the cigarette along the circumferential direction, meanwhile, a first contour sensor synchronously scans and maps the contour of the cigarette along the central axis direction, and a data acquisition unit acquires measurement data of the first contour sensor and the second contour sensor;
(5) And (3) data processing: the data acquisition device sends the acquired measurement data to a computer, the computer obtains three-dimensional contour data of the cigarettes through operation processing and draws three-dimensional contour bodies of the cigarettes, and the data processing process is shown in FIG. 1;
(6) Sample unloading: when the cigarettes on the sample holder are measured, the signal controller controls the electric telescopic push rod to shrink upwards to drive the detection cabin to ascend, and the sample unloading unit breaks away from the cigarettes held on the sample holder by knocking the cigarettes and drops into the sample collection barrel to be collected in a concentrated manner;
(7) And (3) repeating the steps (2) to (6) until all cigarettes are measured, and taking the average value of the lengths, circumferences, roundness and cylindricity of all cigarettes to obtain the average length, circumference, roundness and cylindricity of the cigarettes subjected to batch sample injection, wherein the calculated length, circumference, roundness and cylindricity values can be stored and calculated by a computer.
The roundness values of several common patterns are measured and calculated by using the measuring method of the embodiment of the utility model, and the results are shown in table 1.
Table 1 roundness values for several common patterns
| Graphic name | Standard circle | Square shape | Regular triangle | Line segment |
| Roundness O | 1 | 0.785 | 0.605 | 0 |
The cylindricity values of several common columnar objects are measured and calculated by using the measuring method provided by the embodiment of the utility model, and the results are shown in Table 2.
Table 2 cylindricity values for several common columnar objects
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A cigarette length, circumference, circularity and cylindricity measuring device based on machine vision, characterized by including:
the sample feeding unit is used for receiving cigarettes to be measured in batches, outputting the cigarettes to the sample feeding unit one by one, and the output cigarettes are in an inverted posture with filter tips facing downwards;
the sample feeding unit receives and fixes cigarettes output by the sample feeding unit through sample holders, the plurality of sample holders are arranged on a sample feeding disc at equal intervals along the circumferential direction, the sample feeding disc is driven by a pulse motor and can rotate around the central axis of the disc body, any sample holder can synchronously rotate to the position right below a discharge port of the sample feeding unit along with the sample feeding disc, a gap is vertically reserved between the top end and the discharge port of the sample feeding unit, the filter tip end of each cigarette is connected with the received cigarette, and the sample holder can move to a detection position right below a detection assembly along with the continuous rotation of the sample feeding disc;
the detecting unit is used for measuring the surface profile of the cigarette positioned at the detecting position and comprises a detecting cabin, the detecting cabin is suspended above the detecting position at first, an electric telescopic push rod is driven to move downwards to cover the outside of the cigarette positioned at the detecting position, a first profile sensor is arranged in the middle of the top end of the cabin, a circle of annular electric sliding rail is arranged on the inner peripheral wall of the cabin in a surrounding mode, a second profile sensor is arranged on the electric sliding rail, the detecting assembly is used for measuring along the central axis direction of the cigarette by using the first profile sensor and obtaining axial profile data of the cigarette, and the second profile sensor is used for measuring along the electric sliding rail around the cigarette for a circle and obtaining circumferential profile data of the cigarette;
and the sample unloading unit is used for unloading the cigarettes at the detection position after the detection is completed.
2. The machine vision based cigarette length, circumference, roundness and cylindricity measuring apparatus of claim 1, wherein: the device also comprises a data acquisition and processing assembly, a data acquisition device and a computer, wherein the data acquisition and processing assembly comprises a signal controller and a computer and is used for automatically controlling a sample injection unit, a sample delivery unit, a detection unit and a sample unloading unit, and the data acquisition device is used for acquiring measurement data of a first contour sensor and a second contour sensor and sending the measurement data to the computer for calculation processing.
3. The machine vision based cigarette length, circumference, roundness and cylindricity measuring apparatus of claim 1, wherein: the sample feeding hopper is of a prismatic table-shaped shell structure with an open top end and serving as a feeding hole and a discharge hole at the bottom end, the small end of the sample feeding hopper is downward, the sample feeding hopper is sequentially connected with the feeding section and the discharge section from the discharge hole downwards to form a through vertical discharge channel, the first discharge gate is arranged between the discharge hole of the sample feeding hopper and the upper hole of the feeding section and used for controlling the opening/closing of the discharge hole of the sample feeding hopper, the second discharge gate is arranged at the bottom end part of the discharge section and used for controlling the opening/closing of the lower end part of the discharge section, the vertical distance between the second discharge gate and the lower hole of the discharge section is smaller than the length of a single vertical cigarette, and the lower hole of the discharge section is used as the discharge hole of the sample feeding unit;
the guide section is of a square column-shaped shell structure, the width of the guide section can only accommodate a single cigarette to be put in a horizontal and straight posture, a gap is reserved between the guide section and two ends of the cigarette, the left side wall and the right side wall of the guide section are parallel to the opening and closing direction of the first discharge gate, the upper end part of the left side wall is provided with a posture adjusting block for guiding the center of the guide section to be outwards protruded, the sample feeding hopper is provided with an indicating arrow for prompting the placement direction of the cigarette, and the direction pointed by the indicating arrow is perpendicular to the opening and closing direction of the first discharge gate and is arranged towards the outwards protruded direction of the posture adjusting block;
the discharging section is of a long tubular structure, the outer diameter is smaller than the width of the guiding section, and the inner diameter can accommodate the placement of cigarettes in a single vertical posture;
the first discharging gate and the second discharging gate are all electric gates, and when one gate is in an open state, the other gate is in a closed state, and only one gate is always kept open.
4. The machine vision based cigarette length, circumference, roundness and cylindricity measuring apparatus of claim 1, wherein: in the sample feeding unit, the pulse motor and the sample feeding disc are driven by a gear transmission mechanism.
5. The machine vision based cigarette length, circumference, roundness and cylindricity measuring apparatus of claim 1, wherein: in the sample feeding unit, the sample holder is a columnar body made of electromagnetic wave blocking materials, and the middle part of the top end surface is coated with self-adhesive.
6. The machine vision based cigarette length, circumference, roundness and cylindricity measuring apparatus of claim 1, wherein: in the detection unit, the detection cabin is made of electromagnetic wave blocking materials, and the opening end of the detection cabin faces downwards.
7. The machine vision based cigarette length, circumference, roundness and cylindricity measuring apparatus of claim 1, wherein: the sample unloading unit is an electric swing rod and comprises a rotation driving device and a swing rod, the rotation driving device is used for driving the swing in a horizontal plane, the central axis of the power output shaft is vertical, the swing rod body is horizontal and driven by the rotation driving device, the sample unloading unit can rotate around the central axis of the power output shaft in the horizontal plane, and the sample unloading unit can be contacted with a cigarette on a sample holder of the detection position when swinging to the detection position.
8. The machine vision based cigarette length, circumference, roundness and cylindricity measuring apparatus of claim 2, wherein: the device also comprises a supporting table, wherein the sample feeding unit, the sample delivering unit, the detecting unit, the sample unloading unit and the data acquisition and processing assembly are arranged on the supporting table; the supporting table is also provided with a sample collecting barrel for collecting cigarettes unloaded by the sample unloading unit.
9. The machine vision based cigarette length, circumference, roundness and cylindricity measuring apparatus of claim 1, wherein: the cigarette types comprise flue-cured cigarettes, mixed cigarettes, machine-made cigars, manual cigars, heating non-combustible cigarettes and cigarette filter sticks.
10. The machine vision based cigarette length, circumference, roundness and cylindricity measuring apparatus of claim 1, wherein: the first contour sensor and the second contour sensor are CCD contour scanning sensors or laser contour scanning sensors.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321015162.3U CN220288524U (en) | 2023-04-28 | 2023-04-28 | Cigarette length, circumference, roundness and cylindricity measuring device based on machine vision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321015162.3U CN220288524U (en) | 2023-04-28 | 2023-04-28 | Cigarette length, circumference, roundness and cylindricity measuring device based on machine vision |
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| Publication Number | Publication Date |
|---|---|
| CN220288524U true CN220288524U (en) | 2024-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321015162.3U Active CN220288524U (en) | 2023-04-28 | 2023-04-28 | Cigarette length, circumference, roundness and cylindricity measuring device based on machine vision |
Country Status (1)
| Country | Link |
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| CN (1) | CN220288524U (en) |
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2023
- 2023-04-28 CN CN202321015162.3U patent/CN220288524U/en active Active
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