CN111758980A - On-line viscosity control discharging device for bulking machine and control method - Google Patents
On-line viscosity control discharging device for bulking machine and control method Download PDFInfo
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- CN111758980A CN111758980A CN202010614701.XA CN202010614701A CN111758980A CN 111758980 A CN111758980 A CN 111758980A CN 202010614701 A CN202010614701 A CN 202010614701A CN 111758980 A CN111758980 A CN 111758980A
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23N—MACHINES OR APPARATUS FOR TREATING HARVESTED FRUIT, VEGETABLES OR FLOWER BULBS IN BULK, NOT OTHERWISE PROVIDED FOR; PEELING VEGETABLES OR FRUIT IN BULK; APPARATUS FOR PREPARING ANIMAL FEEDING- STUFFS
- A23N17/00—Apparatus specially adapted for preparing animal feeding-stuffs
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23N—MACHINES OR APPARATUS FOR TREATING HARVESTED FRUIT, VEGETABLES OR FLOWER BULBS IN BULK, NOT OTHERWISE PROVIDED FOR; PEELING VEGETABLES OR FRUIT IN BULK; APPARATUS FOR PREPARING ANIMAL FEEDING- STUFFS
- A23N17/00—Apparatus specially adapted for preparing animal feeding-stuffs
- A23N17/005—Apparatus specially adapted for preparing animal feeding-stuffs for shaping by moulding, extrusion, pressing, e.g. pellet-mills
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
Abstract
The invention belongs to the technical field of food, pet and feed machinery. A method for controlling the discharge amount and the water feeding amount of a discharge puffing cavity by using fluid viscosity, which aims to solve the technical problem of insufficient accuracy in the existing control method. The on-line viscosity control discharging device for the bulking machine comprises the following steps of: a discharging puffing cavity; the online viscosity detection device is connected with the discharging puffing cavity; the mechanical energy control device comprises a discharge channel, and the feed end of the discharge channel is connected with the online viscosity detection device; the feeding end of the flow-expanding discharging device is connected with the discharging end of the discharging channel of the mechanical energy controller, the discharging end of the flow-expanding discharging device is provided with a template, and a die hole is formed in the template; and the programmable logic controller is electrically connected with the online viscosity monitoring device and the mechanical energy controller respectively. The invention solves the technical problems of low automation degree and low adjusting accuracy of the existing bulking machine.
Description
Technical Field
The invention relates to the field of puffing machines, in particular to a discharging device for a puffing machine and a control method.
Background
At present, in most food and feed processing industries, in order to realize products with high curing degree, a bulking machine is basically selected for production, and the bulking in the market at present is mainly divided into two types, one type is dry bulking, namely in the extrusion curing process, more materials are cured through mechanical energy (SME), and the mechanical energy (SME) is as follows: the motor drives the screw rod to rotate every hour, so that energy (kilowatt hour/ton) provided for every ton of materials in the puffing cavity is provided; the other method is wet-process puffing, which is mainly characterized in that pre-curing is carried out through a conditioner before extrusion, and then the pre-curing is carried out in an extruder, so that more mechanical energy is saved by adopting the wet-process puffing, the yield is higher, the service life of equipment is prolonged, and the quality of a product puffed by adopting the method is related to various factors, such as the rotating speed of a screw, the opening degree of a discharge hole, the addition amount of water vapor and the like.
The bulking machine in the current market is basically adjusted and controlled by manual experience, and the defects of the control are as follows:
1. the accuracy is not good enough, the production efficiency is low, and the real-time parameter adjustment cannot be carried out, so that the parameter error of the final product is possibly large;
2. the dependence on the operators of the bulking machine is too strong, and the simultaneous production of a plurality of production lines is difficult.
Disclosure of Invention
The first purpose of the invention is to provide a method for controlling the discharge amount and the water feeding amount of a discharge puffing cavity by using fluid viscosity, so as to solve the technical problem of insufficient accuracy in the existing control method.
In order to solve the technical problems, the invention adopts the following technical scheme that a method for controlling the discharge amount and the water feeding amount of a discharge puffing cavity by using fluid viscosity comprises the following steps:
the method comprises the following steps: measuring rheological curves Eq1 and Eq2 by adopting an online viscometer according to the formula of the material in a discharging and puffing cavity of a puffing machine;
wherein Eq1 has the formula
μ＝Kγn-1；
Eq2 has the formula
Mu in Eq1 and Eq2 formulas is viscosity of melt material before mold stripping, and gamma is shearShear rate, K is the rheological coefficient, n is the rheological index (n)<1)， SME0Respectively is a mechanical energy critical value, MC, corresponding to the discharge quantity of the discharge puffing cavity0Critical value of water feeding quantity of water vapour adding device connected with puffing machine, α is regression coefficient, k0Is a fitting coefficient; e is a natural constant; SME is a mechanical energy value corresponding to the discharge amount of the discharge puffing cavity in actual production; MC is the water feeding quantity value of a water vapor adding device connected with a bulking machine in actual production; empirical equations Eq3, Eq4 for the relationship between bulk weight of the expanded product and viscosity of the melt mass before ejection;
wherein Eq3 has the formula
Eq4 has the formula
ΔP＝Pdie-Ps；
BD in Eq3 and Eq4 formulas is volume weight, L is length of long straight section of die hole, D is diameter of die hole, delta P is pressure difference before and after die stripping, P isdiePressure before the die for the melt material, PsThe saturated vapor pressure is adopted, mu is the viscosity of the melt material before mold stripping, B is a fitting coefficient, theta is a fitting index, and A and C are fitting constants;
step two: and continuously measuring the real-time viscosity and pressure by using an online viscometer, and calculating a required SME value corresponding to the discharge amount of the discharge puffing cavity to be adjusted and an MC value of the water feeding amount to be adjusted according to volume-weight empirical formulas Eq3 and Eq 4.
The second purpose of the invention is to provide an on-line viscosity control discharging device for a bulking machine, which is used for solving the technical problems of low automation degree and low adjustment accuracy of the existing bulking machine.
In order to solve the technical problems, the invention adopts the following technical scheme that the on-line viscosity control discharging device for the bulking machine is characterized in that the on-line viscosity control discharging device is controlled by the method of claim 1, and specifically comprises the following steps: a discharge puffing chamber, and;
the on-line viscosity detection device is connected with the discharging puffing cavity, and;
the mechanical energy control device comprises a discharge channel, and the feeding end of the discharge channel of the mechanical energy control device is connected with the online viscosity detection device;
the feeding end of the flow expanding discharging device is connected with the discharging end of the discharging channel of the mechanical energy control device, the discharging end of the flow expanding discharging device is provided with a template, and the template is provided with a die hole;
the programmable logic controller is respectively and electrically connected with the online viscosity monitoring device and the mechanical energy control device; eq1, Eq2, Eq3, and Eq4 of claim 1 written as core control logic in a programmable logic controller;
the on-line viscosity detection device continuously detects the real-time viscosity of the front of the molten material mold, the pressure sensor obtains the real-time pressure of the front of the molten material mold, and the viscosity signal and the pressure signal are input into the programmable logic controller; and the programmable logic controller outputs SME signals required by the mechanical energy control device according to the Eq3 and the Eq4, and the mechanical energy control device adjusts the opening size of the discharging channel according to the output SME signals.
The invention controls the opening size of the discharge channel of the mechanical energy control device in real time by installing an online viscosity detector at the tail end of the discharge puffing cavity to detect materials in real time and calculating a required SME signal, a water feeding quantity signal and the like by inputting an empirical formula of a programmable logic controller in advance, thereby ensuring the quality of puffed products;
the invention is further improved, a confluence connecting plate is arranged between the discharging puffing cavity and the online viscosity detection device, and a through transition discharging hole is formed in the confluence connecting plate.
The invention is further improved, the transition discharge hole comprises a pair of conical grooves which are partially overlapped and a through hole, the small-diameter end of each conical groove is positioned at the feeding end of the confluence connecting plate, and the through hole is positioned at the position where the conical grooves are partially overlapped.
In a further improvement of the present invention, the mechanical energy control device further comprises:
a servo motor;
the servo motor is arranged at the outer end of the shell, and a discharging channel is formed in the shell;
the driving telescopic connecting rod device is arranged in the shell and is connected with the servo motor;
and the piston is connected with the driving telescopic connecting rod device and can drive the driving telescopic connecting rod device through a servo motor to enable the piston to move up and down so as to control the size of the discharge channel.
Compared with valves used in common bulking machines, the mechanical energy control device has wider application range, can be provided with a plurality of discharging channels and controlled by pistons, and can be suitable for discharging devices of various bulking machines.
The invention is further improved, the on-line viscosity detection device comprises an inner cavity, the inner cavity forms a fluid channel, a vibration test element probe is installed in the inner cavity, the vibration test element probe discharges towards the discharging puffing cavity, the vibration test element probe converts the viscosity value according to the vibration value and the set value, and transmits the analog quantity signal to the programmable logic controller.
The invention is further improved, and the flow-expanding discharging device comprises:
the feeding end of the fluid expansion body is connected with the mechanical energy control device, and a conical fluid expansion cavity is arranged in the fluid expansion body;
the orifice plate is arranged on the fluid expansion discharge end and is provided with a plurality of holes;
the flow distribution cone is installed in a flow expansion cavity of the flow expansion body, and the tip end of the flow distribution cone faces to the feeding end of the flow expansion body;
the template is arranged at the discharge end of the fluid expansion body.
In order to solve the technical problem that the water feeding amount of a main machine of the bulking machine cannot be accurately controlled, the discharging device is further improved, the discharging device also comprises the bulking machine and a water vapor adding device, the water vapor adding device is connected with the bulking machine, the water vapor adding device is provided with an adjusting valve, and the adjusting valve is electrically connected with the programmable logic controller;
and the programmable logic controller outputs a water feeding quantity MC signal which is required by the regulating valve and is required to be regulated according to the Eq3 and the Eq4, and the regulating valve regulates the opening degree of the regulating valve according to the water feeding quantity MC signal which is required to be regulated.
Drawings
FIG. 1 is a control schematic of the present invention;
FIG. 2 is a front view of the bus bar connection plate of the present invention;
FIG. 3 is a cross-sectional view of a buss bar attachment plate of the present invention;
FIG. 4 is a cross-sectional view of the diffusion discharge apparatus of the present invention;
FIG. 5 is a side view of an in-line viscosity controlled discharge device for a bulking machine of the present invention;
FIG. 6 is a graph of the rheology of example 3 of the invention.
Detailed Description
For better understanding of the present invention, the above drawings are explained in detail, it should be understood that the "connection" mentioned in the specification and the claims may be a direct connection or an indirect connection, the "feeding end" and the "discharging end" of the same component refer to the position where the material enters or is discharged from the production process, and the "connection" and the "installation" in the specification and the like may adopt the connection methods in the prior art, such as bolt connection, hoop connection and the like, and thus are not described herein again.
Example 1
The method for controlling the discharge amount and the water feeding amount of the discharge puffing cavity by utilizing the fluid viscosity comprises the following steps:
the method comprises the following steps: measuring rheological curves Eq1 and Eq2 by adopting an online viscometer according to the formula of the material in a discharging and puffing cavity of a puffing machine;
wherein Eq1 has the formula
μ＝Kγn-1；
Eq2 has the formula
Mu in the Eq1 and Eq2 formulas is viscosity of molten mass before mold stripping, gamma is shear rate, K is rheological coefficient, and n is rheological index (n)<1)， SME0Respectively is a mechanical energy critical value, MC, corresponding to the discharge quantity of the discharge puffing cavity0Critical value of water feeding quantity of water vapour adding device connected with puffing machine, α is regression coefficient, k0Is a fitting coefficient; e is a natural constant; SME is a mechanical energy value corresponding to the discharge amount of the discharge puffing cavity in actual production; MC is the water feeding quantity value of a water vapor adding device connected with a bulking machine in actual production; empirical equations Eq3, Eq4 for the relationship between bulk weight of the expanded product and viscosity of the melt mass before ejection;
wherein Eq3 has the formula
Eq4 has the formula
ΔP＝Pdie-Ps；
BD in Eq3 and Eq4 formulas is volume weight, L is length of long straight section of die hole, D is diameter of die hole, delta P is pressure difference before and after die stripping, P isdiePressure before the die for the melt material, PsThe saturated vapor pressure is adopted, mu is the viscosity of the melt material before mold stripping, B is a fitting coefficient, theta is a fitting index, and A and C are fitting constants;
step two: and continuously measuring the real-time viscosity and pressure by using an online viscometer, and calculating a required SME value corresponding to the discharge amount of the discharge puffing cavity to be adjusted and an MC value of the water feeding amount to be adjusted according to volume-weight empirical formulas Eq3 and Eq 4.
Example 2
The invention has the following conception: aiming at the problems and inaccuracy existing in the adjustment of the starting parameters in the puffing production process, the on-line viscosity monitoring and discharging device of the puffing machine is designed, so that the purposes of efficiently and accurately adjusting the operating parameters of the puffing machine and digitally, automatically and intelligently controlling the puffing machine are achieved.
Measuring a rheological curve including mechanical energy and water feeding amount by using the on-line viscometer special for the experimental machine aiming at a specific formula;
writing the rheological curves corresponding to the different formulas and the volume-weight empirical formula into a programmable logic controller to serve as core control logic;
inputting a viscosity signal and a pressure signal into a programmable logic controller control system by adopting the commercial on-line viscometer and a same-series double-screw bulking machine which ensures that rheological properties are consistent, and outputting control signals of mechanical energy and water feeding amount by a rheological curve according to the expected bulking product quality;
the mechanical energy control device is controlled by the mechanical energy signal; the opening degree of the regulating valve of the water vapor adding pipeline of the modulator is controlled by a water feeding amount signal; according to the technical scheme, a 'viscosity-mechanical energy/water feeding amount-quality of the puffed product' control closed loop is finally formed.
As shown in fig. 1 to 5, a discharge puffing cavity 2 of the twin-screw puffing machine is connected with a confluence connecting plate 3, the confluence connecting plate 3 is provided with a through transition discharge hole 301, the transition discharge hole 301 is a pair of partially overlapped conical grooves and a through hole which are arranged at one end of the confluence connecting plate 3 connected with the discharge puffing cavity 2, and the through hole is positioned at the position where the pair of hammer-shaped grooves are partially overlapped, the transition discharge hole 301 can further compress the material coming out of the bulking machine and form a certain pressure, so that the material forms a certain length of plunger flow at the tail end, thereby better maturing the material and providing better fluidity and homogeneity of the molten material, it being understood that a twin screw expander is used in this figure, but is not limited to the use of twin screw expanders and may be adapted for use with single screw or multiple screw expanders as well.
The other end and the online viscosity detection device 4 of collecting bar connection board 3 are connected, and online viscosity detection device 4 includes shell body 402, is equipped with current vibrations component test probe 401 in the shell body 402 inner chamber, and the one end of the popped chamber 2 ejection of compact of orientation of vibrations component test probe 401 is connected with programmable logic controller (PLC for example) 8 through cable 403 on-line viscosity detection device 4, and on-line viscosity detection device 4 back is connected mechanical energy controlling means 5.
Mechanical energy controlling means 5 includes servo motor 501, drive telescopic link device 502, casing 503, piston 504, discharge channel has been seted up on the casing 503, discharge channel's feed end is connected with online viscosity detection device 4's discharge end, servo motor 501 installs the outside at casing 503, drive telescopic link device 502 installs in the inside of casing 503 and is connected with servo motor 501, drive telescopic link device 502 specifically adopts the electric jar to drive, the electric jar converts the rotation into linear motion. Piston 504 is connected with drive telescopic link device 502, the discharge gate that runs through has been seted up on piston 504, namely servo motor 501 can control drive telescopic link device 502 and drive piston 504 and change the opening sectional area size of discharging channel, when the discharge gate of piston 504 and the discharging channel of shell coincide, the area of discharging channel is the biggest this moment, when the size of discharging channel needs to be changed, through servo motor 501 control piston 504 reciprocate can, it should be understood that above-mentioned mechanical energy controlling means 5's embodiment is only to a mode in this figure, can change or increase the quantity of discharging channel on the casing correspondingly when needing the multichannel ejection of compact to different bulking machines, carry out corresponding change with the structure or the size of piston simultaneously, can play the problem of implementing control outlet channel opening size equally.
The discharge end of the mechanical energy control device 5 is connected with the feed end of the flow expansion discharge device 6, as shown in fig. 4, the flow expansion discharge device 6 comprises a flow expansion body 601, a pore plate 602, a diversion cone 603 and a template 604, the feed end of the flow expansion body 601 is connected with the mechanical energy control device 5, the feed end of the flow expansion body 601 gradually expands inwards to form two discharge ends so as to form a flow expansion cavity, the pore plate 602 is installed at the discharge end of the flow expansion body 601, a plurality of holes are formed in the pore plate 602, which can play a role in rectifying and filtering fibers, and the diversion cone 603 is also installed in the flow expansion cavity, the tip of the diversion cone 603 faces the feed end of the flow expansion body 601, which can play a role in uniformly distributing flow, so as to prevent the material from blocking the template excessively, the template 604 is installed at the discharge end of the flow expansion body 601, and a die hole is formed in the template 604, that the material.
A pressure sensor 9 is arranged in the discharging puffing cavity 2 of the double-screw puffing machine, and the pressure sensor 9 is electrically connected with a programmable logic controller 8. The pressure sensor 9 is arranged between the on-line viscosity detecting device 4 and the mechanical energy control device.
The working principle is as follows: after the bulking machine is extruded, the material enters the discharging bulking cavity 2 through the extrusion screw 1, and the material which is formed into a plunger shape by the extrusion again through the confluence connecting plate 3 enters the online viscosity detection device 4, a vibration element test probe 7 in the online viscosity detection device 4 can convert the vibration value and a set value into a viscosity value and transmit analog data to the programmable logic controller 8 through a cable 403, a pressure sensor 9 detects real-time pressure before the molten material mold and transmits the real-time pressure to the programmable logic controller 8, the programmable logic controller 8 calculates a mechanical energy (SME) signal to be adjusted and a water feeding amount signal to be adjusted and transmits the SME signal to the mechanical energy control device 5 and a water vapor adding device 7 which is externally connected with the bulking machine, so that the opening sizes of regulating valves in the mechanical energy control device 5 and the water vapor adding device 7 are controlled, and the bulked material with better quality is obtained, the material that comes out from mechanical energy controlling means 5 discharging channel gets into and expands a class discharging device 6 and shunts through spreader cone 17 to even entering expands class discharging device 6's discharge end, filters through orifice plate 602 and through the shaping of template 604, the last fashioned material can be cut through the cutting device that connects after.
The invention also provides a control method of the discharging device, which comprises the following steps:
firstly, measuring rheological curves Eq1 and Eq2 containing mechanical energy SME and water feeding quantity MC by adopting a special online viscometer according to a formula of a specific material;
wherein Eq1 has the formula of μ ═ K γn-1；
Eq2 has the formula
Mu in the Eq1 and Eq2 formulas is viscosity of molten mass before mold stripping, gamma is shear rate, K is rheological coefficient, and n is rheological index (n)<1)，SME0The discharge quantity of the discharging puffing cavity corresponds to the discharge quantity of the discharging puffing cavity respectivelyCritical value of mechanical energy, MC0Critical value of water feeding quantity of water vapour adding device connected with puffing machine, α is regression coefficient, k0Is a fitting coefficient; e is a natural constant; SME is a mechanical energy value corresponding to the discharge amount of the discharge puffing cavity in actual production; MC is the water feeding quantity value of a water vapor adding device connected with a bulking machine in actual production;
empirical equations Eq3, Eq4 for the relationship between bulk weight of the expanded product and viscosity of the melt mass before ejection;
step two: writing Eq1, Eq2 and empirical formula Eq3, Eq4 of volume weight into the programmable logic controller as core control logic;
wherein Eq3 has the formula
Eq4 has the formula Δ P ═ Pdie-Ps；
BD in Eq3 and Eq4 formulas is volume weight, L is length of long straight section of die hole, D is diameter of die hole, delta P is pressure difference before and after die stripping, P isdiePressure before the die for the melt material, PsThe saturated vapor pressure is adopted, mu is the viscosity of the melt material before mold stripping, B is a fitting coefficient, theta is a fitting index, and A and C are fitting constants;
step three: continuously measuring the real-time viscosity by using the online viscosity detection device, and inputting a viscosity signal and a pressure signal into a programmable logic controller;
step four: the programmable logic controller can output a required SME signal and a water feeding amount signal to be adjusted according to the volume-weight empirical formula in the second step, the mechanical energy control device can adjust the opening size of the discharging channel according to the output SME signal, and the water vapor adding pipeline adjusting valve can adjust the opening of the adjusting valve according to the output water feeding amount adjusting signal, so that a control closed loop is formed, and the automatic control of the discharging device of the bulking machine is realized according to the online viscosity test.
Example 3
In the following, micropterus salmoides are taken as a specific description, and the corresponding formula of micropterus salmoides generally takes wheat flour or common flour as a main starch source.
The method comprises the following steps: the rheological property of the material is measured by adopting a practical bulking machine aiming at the formula, and a rheological curve taking SME and water feeding amount as independent variables is obtained through DOE and MatlabCyrve Fitting, and is shown in figure 6. Namely:
Eq5：μ＝1920×e{0.53×[0.0028(SME-28)+10.91(MC-0.24)]}×γ0.53-1
wherein the expected volume weight BD is 395g/L, and the boot parameters are set as SME: 27Kwhr/Mton, water feed: at a rate of 26%,
step two: writing the corresponding rheological curve Eq5 and the empirical volume-weighted formula Eq6 into a programmable logic controller;
step three: the on-line viscosity detection device can measure the viscosity of the fish material in real time and feed a viscosity signal and a pressure signal back to the PLC;
the shear rate versus viscosity results from the expected bulk weight of 395g/L and the rheology curve are shown in Table 1. The commercial on-line viscometer measures the viscosity error versus results, see table 1.
TABLE 1 shear rate vs. viscosity relationship control, viscosity error comparison
In Table 1, the meaning of N/A is not known.
Step four: the mechanical energy control device can adjust the sizes of the discharge channel of the mechanical energy control device and the opening of the regulating valve according to the output SME signal and the adjustment water feeding quantity signal, the PLC takes a specific formula rheological curve shown by Eq5 and an empirical equation of the relationship between the volume weight and the viscosity shown by Eq6 as core logic calculation according to the expected volume weight of 410g/L to obtain the die drawing viscosity and the corresponding opening and water feeding quantity of the SME and mechanical energy controller SDTV, and the calculation process is specifically as follows:
(4-1)5.0mm bass (die hole diameter D is 5mm) capacity Q is 5500kg/hr, die plate opening n is 66, melt density rho before demoulding is 540g/L, and the formula is adopted
Wherein gamma is the shear rate, and the shear rate of single-mode hole demoulding is obtained
(4-2) bringing the expected bulk weight 410g/L and the mold-release pressure difference delta P to 2.6Mpa into Eq6 to obtain the required mold-release viscosity mu to be adjusted to 46.5 Pas;
(4-3) the shear rate gamma calculated in the step 1 and the demolding viscosity mu calculated in the step 2 are substituted into Eq5, the mechanical energy required to be adjusted is calculated to be 43 kilowatt-hour/ton, and the corresponding mechanical energy control opening is 25%, and the results are shown in Table 2.
TABLE 2 die viscosity and corresponding SME, SDTV opening and water feed
Claims (8)
1. The method for controlling the discharge amount and the water feeding amount of the discharge puffing cavity by utilizing the fluid viscosity is characterized in that: the method comprises the following steps:
the method comprises the following steps: measuring rheological curves Eq1 and Eq2 by adopting an online viscometer according to the formula of the material in a discharging and puffing cavity of a puffing machine; wherein Eq1 has the formula
μ＝Kγn-1；
Eq2 has the formula
Mu in the Eq1 and Eq2 formulas is viscosity of molten mass before mold stripping, gamma is shear rate, K is rheological coefficient, and n is rheological index (n)<1)，SME0Respectively is a mechanical energy critical value, MC, corresponding to the discharge quantity of the discharge puffing cavity0Critical value of water feeding quantity of water vapour adding device connected with puffing machine, α is regression coefficient, k0Is a fitting coefficient; e is a natural constant; SME is a mechanical energy value corresponding to the discharge amount of the discharge puffing cavity in actual production; MC is the water feeding quantity value of a water vapor adding device connected with a bulking machine in actual production; empirical equations Eq3, Eq4 for the relationship between bulk weight of the expanded product and viscosity of the melt mass before ejection;
wherein Eq3 has the formula
Eq4 has the formula
ΔP＝Pdie-Ps；
BD in Eq3 and Eq4 formulas is volume weight, L is length of long straight section of die hole, D is diameter of die hole, delta P is pressure difference before and after die stripping, P isdiePressure before the die for the melt material, PsThe saturated vapor pressure is adopted, mu is the viscosity of the melt material before mold stripping, B is a fitting coefficient, theta is a fitting index, and A and C are fitting constants;
step two: and continuously measuring the real-time viscosity and pressure by using an online viscometer, and calculating a required SME value corresponding to the discharge amount of the discharge puffing cavity to be adjusted and an MC value of the water feeding amount to be adjusted according to volume-weight empirical formulas Eq3 and Eq 4.
2. An on-line viscosity control discharging device for a bulking machine, which is characterized in that the on-line viscosity control discharging device is controlled by the method of claim 1, and specifically comprises the following steps:
a discharge puffing chamber, and;
the on-line viscosity detection device is connected with the discharging puffing cavity, and;
the mechanical energy control device comprises a discharge channel, and the feeding end of the discharge channel of the mechanical energy controller is connected with the online viscosity detection device;
the feeding end of the flow expanding discharging device is connected with the discharging end of the discharging channel of the mechanical energy controller, the discharging end of the flow expanding discharging device is provided with a template, and the template is provided with a die hole;
the programmable logic controller is respectively and electrically connected with the online viscosity monitoring device and the mechanical energy controller; the method of claim 1 wherein said Eq1, Eq2, Eq3, and Eq4 are written as core control logic in a programmable logic controller;
the on-line viscosity detection device continuously detects the real-time viscosity of the front of the molten material mold, the pressure sensor obtains the real-time pressure of the front of the molten material mold, and the viscosity signal and the pressure signal are input into the programmable logic controller; and the programmable logic controller outputs SME signals required by the mechanical energy controller according to the Eq3 and the Eq4, and the mechanical energy controller adjusts the opening size of the discharging channel according to the output SME signals.
3. The on-line viscosity control discharging device for the bulking machine according to claim 1, wherein a confluence connecting plate is installed between the discharging bulking cavity and the on-line viscosity detecting device, and a through transition discharging hole is formed on the confluence connecting plate.
4. The on-line viscosity control discharging device for the bulking machine according to claim 2, wherein the transitional discharging hole comprises a pair of partially overlapped conical grooves and a through hole, the small diameter end of the conical groove is located at the feeding end of the confluence connecting plate, and the through hole is located at the partially overlapped position of the pair of conical grooves.
5. The on-line viscosity control discharging device for the bulking machine according to claim 1, wherein the mechanical energy control device further comprises:
a servo motor;
the servo motor is arranged at the outer end of the shell, and a discharging channel is formed in the shell;
the driving telescopic connecting rod device is arranged in the shell and is connected with the servo motor;
and the piston is connected with the driving telescopic connecting rod device and can drive the driving telescopic connecting rod device through a servo motor to enable the piston to move up and down so as to control the size of the discharge channel.
6. The on-line viscosity control discharging device for the bulking machine according to claim 1 or 2, wherein the on-line viscosity detecting device comprises an inner cavity forming a fluid channel, a vibration testing element probe is installed in the inner cavity, the vibration testing element probe discharges towards the discharging bulking cavity, and the vibration testing element probe converts a viscosity value according to a vibration value and a set value and transmits an analog quantity signal to the programmable logic controller.
7. The on-line viscosity-controlled discharge device for a bulking machine of claim 1, wherein said flow-expanding discharge device comprises:
the feeding end of the fluid expansion body is connected with the mechanical energy controller, and a conical fluid expansion cavity is arranged in the fluid expansion body;
the orifice plate is arranged on the fluid expansion discharge end and is provided with a plurality of holes;
the flow distribution cone is installed in a flow expansion cavity of the flow expansion body, and the tip end of the flow distribution cone faces to the feeding end of the flow expansion body;
the template is arranged at the discharge end of the fluid expansion body.
8. The on-line viscosity control discharging device for the bulking machine according to claim 2, wherein the discharging device further comprises a bulking machine and a water vapor adding device, the water vapor adding device is connected with the bulking machine, the water vapor adding device is provided with a regulating valve, and the regulating valve is electrically connected with the programmable logic controller;
and the programmable logic controller outputs a water feeding quantity MC signal which is required by the regulating valve and is required to be regulated according to the Eq3 and the Eq4, and the regulating valve regulates the opening degree of the regulating valve according to the water feeding quantity MC signal which is required to be regulated.
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| CN202010614701.XA Active CN111758980B (en) | 2020-06-30 | 2020-06-30 | On-line viscosity control discharging device for bulking machine and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114287649A (en) * | 2021-12-07 | 2022-04-08 | 江苏丰尚智能科技有限公司 | Crack differential pressure type feed production device, method, computer equipment and storage medium |
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| CN114287649A (en) * | 2021-12-07 | 2022-04-08 | 江苏丰尚智能科技有限公司 | Crack differential pressure type feed production device, method, computer equipment and storage medium |
| CN114287649B (en) * | 2021-12-07 | 2023-04-07 | 江苏丰尚智能科技有限公司 | Crack differential pressure type feed production device, method, computer equipment and storage medium |
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| CN111758980B (en) | 2021-08-13 |
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