CN207370075U - A kind of two-way cigarette machine that the detection of two-way microwave is avoided to interfere with each other - Google Patents
A kind of two-way cigarette machine that the detection of two-way microwave is avoided to interfere with each other Download PDFInfo
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- CN207370075U CN207370075U CN201721357951.XU CN201721357951U CN207370075U CN 207370075 U CN207370075 U CN 207370075U CN 201721357951 U CN201721357951 U CN 201721357951U CN 207370075 U CN207370075 U CN 207370075U
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Abstract
The utility model discloses a kind of two-way cigarette machine that the detection of two-way microwave is avoided to interfere with each other, include the deformation cylinder resonator while in truncated setting, and the one section of cutoff frequency set at deformation cylinder resonator, higher than the cut-off waveguide of the working frequency of the microwave signal of transmission, the deformation cylinder resonator includes using TM010Pattern work, the first passage resonator that is electrically coupled and using TE111Pattern work, magnetic-coupled second channel resonator；This is avoided the two-way cigarette machine that interferes with each other of two-way microwave detection that from can improving the detection sensitivity of microwave detection system, and that reduces two-way microwave detection system in two-way cigarette machine interferes with each other problem, increases high-speed cigarette machine microwave detection system reliability.
Description
Technical field
The utility model is more particularly to a kind of two-way cigarette machine that the detection of two-way microwave is avoided to interfere with each other.
Background technology
, it is necessary to strictly control the humidity and density of cigarette in cigarette production process.It is measured and control is directly related to
Product quality and production efficiency.In real time, non-contact, noninvasive measurement is the important requirement and research of current humidity and density measure
Direction.
Since the eighties in last century, pushed away to improve the smoke machines manufacturer such as the speed of production of smoke machine, German Hauni companies
Double plume ultrahigh speed cigarette machines are gone out.It has disposed two sets of High-Speed Automatic cigarette systems to produce simultaneously in same smoke machine, because
And cigarette production capacity is made to be doubled.It, be in same inspection in order to detect the density of produced cigarette and humidity in real time
The detection probe of two sets of independent microwave detection systems is integrated in probing head, two flues of smoke machine are examined into Mobile state respectively
It surveys.
Permanent win in Shanghai has possessed a utility model patent " a kind of microwave TT＆C system for double track cigarette machine "
(ZL2013 2 0205881.1) discloses the microwave TT＆C system of double track cigarette machine.The patent is designed to provide one kind
For the microwave detection system of double track cigarette machine, two resonators in the microwave detection system of double track cigarette machine can be solved
Microwave leakage and the problem of interfere with each other, by the residual microwave leakage between two resonators to the cigarette in two flues
The influence of humidity and Density Detection is minimized.
According to the system of above-mentioned Patent design, practical application is crossed in tobacco factory's back warp, is surpassed although having substantially solved double plumes
Two-way microwave detection system interferes with each other problem in high-speed cigarette machine microwave detection system, but due to cigarette machine installation space position
Put it is narrow and small, microwave detecting device it is size-constrained, two paths of signals from it is too near, the influence of two paths of signals cannot in some cases
It completely eliminates.So that detection during when and be present with the situation of jitter.
Utility model content
The purpose of this utility model is to provide a kind of detection sensitivity that can improve microwave detection system, reduces two-way volume
Two-way microwave detection system interferes with each other problem in smoke machine, and increase high-speed cigarette machine microwave detection system reliability avoid two
The two-way cigarette machine that road microwave detection interferes with each other.
In order to solve the above-mentioned technical problem, the technical solution of the utility model is：
A kind of two-way cigarette machine that the detection of two-way microwave is avoided to interfere with each other includes while justifying in the deformation of truncated setting
The one section of cutoff frequency set at column resonator and deformation cylinder resonator is cut higher than the working frequency of the microwave signal of transmission
Only waveguide, the deformation cylinder resonator include using TM010Pattern work, the first passage resonator that is electrically coupled and
Using TE111Pattern work, magnetic-coupled second channel resonator.
Preferably, it is described use the resonance wavelength of first passage resonator that TM010 patterns work, being electrically coupled for
Preferably, it is described use resonance wavelength that TE111 patterns work, magnetic-coupled second channel resonator for
The utility model has the technical effect that following aspect：Original double plume ultrahigh speed cigarette machine microwaves are examined
Examining system has made further improvement, which being capable of the density of the cigarette of two flues of detection production and wet in real time at a high speed online
Degree, and reject the various cigarettes for having mass defect so that the cigarette target weight sampling error value of binary channels ultrahigh speed cigarette machine
Reach within 7mg, meet the quality of production requirement of cigarette.
Description of the drawings
Fig. 1 is the structure diagram of existing Microwave Cylindrical shape resonator；
Fig. 2 is the cylindrical microwave cavity resonator structure schematic diagram of the deformation of the utility model；
Fig. 3 is the anti-leak cut-off waveguide structure diagram of the utility model；
Fig. 4 is the TM of the cylindrical cavity of the utility model010Mode field structure diagram；
Fig. 5 is the TE of the cylindrical cavity of the utility model111Mode field structure diagram；
Fig. 6 is the magnetic coupling schematic diagram of the resonator of the utility model；
Fig. 7 is that the resonator of the utility model is electrically coupled schematic diagram.
Specific embodiment
In the present embodiment, it is necessary to which explanation, relational terms such as first and second and the like are used merely to one
A entity or operation with another entity or operate distinguish, without necessarily requiring or implying these entities or operation it
Between there are any actual relationship or orders.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Cover non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only include those
Element, but also including other elements that are not explicitly listed or further include as this process, method, article or set
Standby intrinsic element.
In addition, the connection between component or fixed form if not otherwise specified in this embodiment, connection or solid
Determine mode can be fixed by bolt commonly used in the prior art or nail pin fix or axis pin connection etc. modes, therefore, this
It is no longer described in detail in embodiment.
Embodiment
A kind of two-way cigarette machine that the detection of two-way microwave is avoided to interfere with each other includes while justifying in the deformation of truncated setting
The 1 one section of cutoff frequency set is higher than the working frequency of the microwave signal of transmission at column resonator 1 and deformation cylinder resonator
Cut-off waveguide 2, the deformation cylinder resonator include using TM010First passage resonator that pattern works, being electrically coupled
3 and using TE111Pattern work, magnetic-coupled second channel resonator 4.
The final index that density of tobacco rod uniformity is examined in cigarette machine is target weight sampling standard deviation SD.SD refers to 50
Branch cigarette standard weight deviations value, standard weight deviations
G in formulai=the i-th cigarette gravimetric value,Branch cigarette averaged weight value, standard weight deviations value is smaller, and explanation takes
Sample cigarette weight dispersion is smaller, then the accuracy of detection of microwave detection system or resolution ratio are higher.Usually require that SD is less than 8mg,
The generally attainable value of microwave detection system.But the situation for having swinging of signal qualitative when having indivedual, and user wishes
Prestige, which can further improve quality, makes SD values reduce again.So, it is also necessary to microwave detection system is further improved.
Its reason is analyzed, first, the microwave energy leakage of resonator has been greatly reduced the Q values of resonator so that detection spirit
Sensitivity reduces.Second is that although many measures are taken to reduce the interference between two-way resonator, due between two paths of signals
Every too closely, this interference still has, so as to affect the stability of detection signal.
In order to further improve the detection sensitivity of microwave detection system, while reduce two-way microwave in two-way cigarette machine and examine
The reliability for interfering with each other problem, increasing high-speed cigarette machine microwave detection system of examining system.To microwave cavity operating mode,
Cavity geometry, structure have made further optimization design.
1) cylinder resonator of deformation first, is employed, improves the Q values of microwave cavity, so as to improve system inspection
Survey sensitivity.
The schematic diagram of Microwave Cylindrical shape resonator is as shown in Figure 1.The Q values height of microwave cavity determines that system detectio is sensitive
Degree.Q values are higher, and detection sensitivity is also higher.Due to the geomery of Q values and cavity, operating mode, cavity wall conductor material spy
Property and operation wavelength etc. it is all related, so in order to make generality discussion, commonly use Q δ/λ0Characterize the property of resonator.δ in formula
Represent the skin depth of cavity wall conductor, λ0Represent the resonance wavelength of resonator.Q·δ/λ0Only have with cavity size and operating mode
It closes, therefore referred to as form factor.After the operating mode of microwave cavity is determined, volume V of the form factor with inside cavity
It is directly proportional to the ratio between surface area S.The volume V of intra resonant cavity represents the microwave energy that the resonator can store, surface
Product S represents its loss to microwave energy.V/S is bigger to represent that its storage energy is more and is lost smaller.And Q values except with V/S
It is directly proportional outer, also with δ/λ0It is inversely proportional.
Originally the cylindrical cavity used in single channel microwave cigarette weight detecting and controlling system, inside diameter
D is 55 ㎜, and length L is 10 ㎜.In current double channels microwave detecting system, due to its two channel center, spacing only has 32 ㎜,
It is contemplated that the wall thickness of resonator, the inside maximum gauge of used microwave cavity can only also have 30 ㎜.So at it
In the case that his condition is identical, by calculating the ㎜ resonators of the Q values about Φ of the resonator that can obtain the ㎜ of Φ=55=30
1.2 times.And if two resonators use same TM010Operating mode, for the operating mode, resonance wavelength0=
1.31D.As it can be seen that the resonance wavelength of big resonator is 1.72 times of size resonant wavelength.So the two is multiplied, originally
The Q values of big resonator should be 2.06 times of small resonator.In fact, by calculating it is recognised that the diameter of cylinder resonator
It is bigger, its increased multiple of volume multiple more increased than its surface area faster, so its Q value also can higher.
But if according to original big resonator size, in binary channels cigarette weight detecting system, due to being pacified
The limitation of holding position can not be realized.For this purpose, on the one hand to consider to adapt to installation dimension requirement, while also to carry as far as possible
The Q values of high resonator are devised the truncated deformation cylinder resonator (as Figure 2-3) in one side.It is computed, this resonator
Q values be about 1.8 times of the small resonators of ㎜ of Φ=30, the requirement that can be substantially met.And its resonant frequency is also close to original
The resonant frequency of microwave cavity used in single channel microwave cigarette weight detecting and controlling system, this is allowed in system system
When making, the versatility of each component is also stronger.
2) below-cutoff wave guide has been used in cigarette inlet and outlet position, has both solved microwave energy from cigarette inlet and outlet position
Serious leak, and tested cigarette can be allowed to pass through.
According to microwave theory, the frequency characteristic of waveguide can be described with cutoff frequency, less than the electromagnetism of cutoff frequency
Ripple cannot be by waveguide, and the electromagnetic wave higher than cutoff frequency can pass through waveguide.Using this characteristic, shielding can be reached
Electromagnetic wave, while realize the purpose of certain entity connection.Method is, one section of the inlet and outlet Position Design of cigarette should can allow by
Substance is surveyed by that and cannot allow the cut-off waveguide that microwave signal leaks out from this hole (see Fig. 4-5, solid line is electric power in figure
Line, dotted line are the magnetic line of force).The cutoff frequency of the waveguide should be designed at the work frequency of the microwave signal significantly larger than to be transmitted
Rate, so after the length of cut-off waveguide reaches certain value, microwave energy cannot be further along the waveguide to external radiation.Due to this
Mainly using the frequency cutoff area of waveguide in kind application, therefore the concept of cut-off waveguide is the base in shielding construction design
One of this concept.
According to microwave theory, the cutoff frequency of circular waveguide：
fc=17.6/d；
In formula：D is the interior diameter of circular waveguide, and unit is cm,
fcUnit be GHz.
When falling the electromagnetic wave in waveguide frequency cutoff area through waveguide, it may occur that attenuation, this attenuation are known as cutting
The only absorption loss of waveguide, the absorption loss calculation formula of circular cut-off waveguide are as follows：
A=1.8 × fc×t(1-(f/2)1/2) (dB)。
In formula：T is off the length of waveguide, and unit is cm,
F is the resonant frequency (GHz) of resonator,
Fc is off waveguide cutoff frequency (GHz)
If the resonant frequency f of resonator is far below cut-off waveguide cutoff frequency (f ﹤ fc/ 3),
Then simplification of a formula is：A=1.8 × fc×t(dB)
For circular cut-off waveguide：
A=31.7t/d (dB)
For the resonator used in system, diameter D=55 ㎜, resonance wavelength
λ0=1.31D=7.2 ㎝.And the aperture d=1.2 ㎝ of cigarette inlet and outlet, then its cutoff wavelength is λc=2.04 ㎝.
The resonance wavelength of resonator is far longer than cutoff wavelength λc=2.04 ㎝.In order to which leakage is made (to be let out less than 30dB from cut-off waveguide
The microwave power of leakage is less than the one thousandth of microwave power in cavity), take the ㎝ of t >=2.The requirement to leakage can be met.
3) principle that cannot be mutually coupled using crossed electric and magnetic field employs two to the microwave cavity of two-way detecting system
The mutually orthogonal different working modes of kind of electromagnetic field, so as to avoid interfering with each other for two interchannel electromagnetic fields.Meanwhile also make
The Q values of resonator increase, and thus, can also improve the detection sensitivity of system.
In cylindrical microwave resonator, there are two types of lowest-order oscillation mode (i.e. the longest oscillation mode of resonance wavelength),
One kind is H-type oscillation mode H111(also referred to as TE111Operating mode), another kind is E type oscillation modes E010(also referred to as TM010Work
Operation mode).The resonance wavelength of both oscillation modes is respectively：
With
R is the radius of cylinder resonator in formula, and L is the length of resonator.From calculating：
When the length L of cylinder resonator is more than 2.1R (R is the radius of cylinder resonator), TE111For the minimum of resonator
Secondary mould；When the length L of cylinder resonator is less than 2.1R, TM010For the lowest order mode of resonator.For system, if R=
27.5 ㎜, the length for taking first passage microwave cavity are 50 ㎜, the length L=60 ㎜ of second channel microwave cavity.So
It just can be so that first passage resonator works in TM010Pattern, and second channel resonator works in TE111Pattern.
The field structure figure of both operating modes is as shown in Figure 3.As it can be seen that TM010The direction of an electric field of pattern is parallel to
The length direction and electric field of resonator are only along the length direction component of resonator.And TE111The direction of an electric field of pattern is perpendicular to
The length direction of resonator.So the electromagnetic field of both operating modes is orthogonal orthogonal.According to Theory of Electromagnetic Field,
Two kinds of mutually perpendicular electromagnetic fields of field structure cannot be mutually coupled, and be interfered with each other so will not generate.Make two-way microwave
The microwave cavity of detecting system works in the different operating mode of two such, and this makes it possible to avoid two in two-way cigarette machine
Road microwave detection system interferes with each other.
Known by microwave cavity theory, for the lowest order mode of cylindrical cavity, the Q values of resonator are with the long L's of chamber
Increase and increase, and gradually tend to the value of an approximately constant.
It is calculated by the cylinder resonator that internal diameter is 27.5 ㎜, uses the TE that length is 60 ㎜111The cylinder resonator of pattern,
Than using the TM that length is 50 ㎜010The Q values of the cylinder resonator of pattern are high by 6%, and compare what is used originally in single channel system
Length is the TM of 10 ㎜010The Q values of the cylinder resonator of pattern are 2.57 times high.
The induction sensitivity that the higher expression microwave cavity of Q values of resonator disturbs intracavitary foreign matter is higher, that is, its
The detection sensitivity of system is higher.It may know that by calculating, for TE111Pattern, since its resonator longitudinal length is more than originally
TM010Resonator, and its resonance wavelength is longer, so its Q value is also corresponding higher.This is also to improving detection sensitivity
Favourable.
In order to encourage different operating modes in the microwave cavity of two passages, two kinds of resonators of reply take two
The different energisation mode of kind.For first passage TM010Pattern, using the mode that is electrically coupled, i.e. signal outputs and inputs probe use
Straight plug-in type enters in resonator；And for second channel TE111Magnetic coupling mode is used, i.e., probe front is curved into annular shape,
It is inserted into resonator, and makes the face of annulus vertical with the direction in magnetic field in resonator.(see Fig. 6-7)
Improvement of twin-channel microwave detection system by above a variety of methods, further improves detection sensitivity, together
When also reduce the leakage of microwave energy to greatest extent, eliminate interfering with each other between microwave channel, accomplish that each passage is micro-
Ripple detects accurate.Through experiment and tobacco factory's production line practice the result shows that, the design is reasonable, residual between two passages
Stay microwave leakage on the humidity and Density Detection of two flues without visible influence.Two flues can realize normal detection and to not conform to
The rejecting of lattice cigarette.
The utility model has the technical effect that following aspect：Original double plume ultrahigh speed cigarette machine microwaves are examined
Examining system has made further improvement, which being capable of the density of the cigarette of two flues of detection production and wet in real time at a high speed online
Degree, and reject the various cigarettes for having mass defect so that the cigarette target weight sampling error value of binary channels ultrahigh speed cigarette machine
Reach within 7mg, meet the quality of production requirement of cigarette.
The above is only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to
In this, any change or replacement expected without creative work should be covered within the scope of the utility model.
Claims (3)
1. a kind of two-way cigarette machine that the detection of two-way microwave is avoided to interfere with each other, it is characterised in that：Include while being set in truncated
The one section of cutoff frequency set at the deformation cylinder resonator and deformation cylinder resonator put is higher than the work of the microwave signal of transmission
The cut-off waveguide of working frequency, the deformation cylinder resonator include using TM010That pattern works, being electrically coupled first is logical
Road resonator and using TE111Pattern work, magnetic-coupled second channel resonator.
2. the two-way cigarette machine according to claim 1 that the detection of two-way microwave is avoided to interfere with each other, it is characterised in that：It is described
Using TM010Pattern work, the resonance wavelength of first passage resonator that is electrically coupled be
3. the two-way cigarette machine according to claim 1 that the detection of two-way microwave is avoided to interfere with each other, it is characterised in that：It is described
Using TE111Pattern work, magnetic-coupled second channel resonator resonance wavelength is
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