CN111730777A - Weighing type liquid color master machine and automatic correction method and application thereof - Google Patents
Weighing type liquid color master machine and automatic correction method and application thereof Download PDFInfo
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- CN111730777A CN111730777A CN202010629620.7A CN202010629620A CN111730777A CN 111730777 A CN111730777 A CN 111730777A CN 202010629620 A CN202010629620 A CN 202010629620A CN 111730777 A CN111730777 A CN 111730777A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
- B29B7/28—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/88—Adding charges, i.e. additives
- B29B7/94—Liquid charges
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Abstract
The invention relates to a weighing type liquid color master machine and an automatic correction method and application thereof. The liquid color master barrel is connected with the delivery pump through a hose. The weighing system, the delivery pump, the limit alarm device and the correction module are connected with the control system through signal lines. The weighing system, the control system and the correction module are matched to realize automatic and accurate correction of the automatic correction weighing type liquid color master machine before and during production, so that the addition of the liquid color master is more accurate, and the produced product has no chromatic aberration.
Description
Technical Field
The invention relates to the field of processing of high polymer materials, in particular to a weighing type liquid color master batch machine for adding a liquid auxiliary agent in the processing process of the high polymer materials, and an automatic correction method and application thereof.
Background
Toner, color master batch or other processing aids are often used in the traditional high polymer material processing process, manual weighing and mixing are methods which are mostly used by factories with low automation degree, but the toner can cause dust pollution in the method, and the color master batch can absorb moisture in the process to increase the water content. With the continuous development of technology, liquid color concentrates are widely used at present due to their unique advantages of being environment-friendly, uniformly dispersed and easily metered. Compared with the addition proportion of 2-4% of the solid color master batch, the addition proportion of the liquid color master batch is relatively low and is 0.01-0.5%, so that the addition amount of the liquid color master machine is required to be accurate, and whether the addition amount of the liquid color master machine is accurate depends on whether the liquid color master machine can be accurately corrected.
The automatic adding equipment for the liquid color masterbatch at present adopts manual weighing, calculation and correction value input to achieve the aim of correction (the applicant authorizes the patent application No. CN2014208153462, and the publication No. CN204382549U), has low automation degree, and can cause the change of the output quantity of the liquid color masterbatch due to the gradual aging of a pump pipe, the gradual deformation of a metering scale and the change of the production environment along with the prolonging of the service time of the adding equipment, thereby finally influencing the color and the quality of a product.
In addition, Chinese patent (application number of the patent granted by the applicant: CN2017202155595, publication number: CN206678212U) discloses a color master batch machine with automatic weighing and calibration functions, which comprises a supporting box body, a main box body, a color master batch barrel and a delivery pump, wherein the supporting box body is connected with the lower side edge of the main box body, a controller and a control circuit are arranged in the main box body, the delivery pump is arranged on the supporting box body, and the delivery pump is connected with the controller through a signal line; a supporting platform is arranged on the supporting box body, a weighing sensor, an acceleration sensor and a displacement sensor are arranged between the supporting platform and the supporting box body, and the weighing sensor, the acceleration sensor and the displacement sensor are respectively connected with the controller through signal lines; the displacement sensor is connected with the controller through a signal line, and the color master barrel is placed on the supporting platform. However, this prior art does not set up limit alarm device and transport number of times automatic correction device to can't reach accurate correction, guarantee the accuracy of the liquid look female addition volume in the production process.
Chinese patent (the applicant authorizes application number: CN 2014201695802, publication number: CN203994338U) discloses a liquid color master machine, which comprises a liquid metering pump, a controller and a metering simulator, wherein the liquid metering pump and the metering simulator are respectively connected with the controller, the controller sends a control signal to the liquid metering pump when receiving an external online signal, the metering simulator is connected with the controller, and the metering simulator can send an analog signal which is the same as the external online signal to the controller when the color master machine is in an offline state; the controller comprises a shell, and a power supply, a control chip, a driving module and a storage module which are arranged in the shell, wherein the control chip is respectively connected with the driving module and the storage module.
Chinese patent (application No. CN201610588420.5, publication No. CN105965713A) discloses a weighing type color master machine, which uses a screw mechanism to push color master. The liquid color master is in a liquid state, a screw cannot be used for pushing, and the device adopted by the invention does not solve the problem that the liquid is easy to drip and leak, and is only suitable for adding solid color master particles. The invention also does not solve the problem of adjustment when the color master batch is measured to have deviation in the production process.
Chinese patent (application No. CN2019212988354, publication No. CN210495999U) discloses a weighing type color masterbatch mixer, which comprises a main hopper, a base, a feeding mechanism and a storage hopper, wherein a discharge hole at the bottom of the main hopper is communicated with the base; a stirring device is arranged in the base, and a stirring motor for controlling the stirring device is arranged on the base.
In addition, for example, CN206406354U discloses a metering color master machine with stirring, CN208305452U, CN210477455U, CN209191033U, CN208839463U discloses a color master machine, CN208839463U discloses an intelligent two-color proportioning color master machine for polypropylene fiber production line, and other related background technologies, all of which have more or less the above-mentioned drawbacks, and those skilled in the art cannot draw a combination hint to solve the drawbacks in the background technologies according to the prior art and combine the above-mentioned prior arts.
Chinese patent application No. 201811468668.3 discloses a weightless feeder control system, which comprises a weighing platform, a hopper, a feeding motor, a weighing sensor, and a controller. The patent does not mention the gradual aging problem of a metering pump pipe for liquid weighing and the single filling amount of liquid color master, the sensor is difficult to solve the problem that the range of a sensor is large for materials contained in a hopper, but the weight loss is extremely small when the liquid color master is added each time, so the precision of the weighing sensor is high, the range is large, and even the realization is impossible.
Disclosure of Invention
Aiming at the technical defects in the prior art, the invention provides a weighing type liquid color master machine. In order to reduce the influence of the symmetric weight system statistics of the connecting pipe, the liquid color master barrel is connected with the delivery pump through a hose; the limit alarm device is designed to prevent the overload of the liquid color master batch and the shortage of the liquid color master batch from influencing the subsequent production; under the mutual cooperation of the weighing system and the control system, the liquid color master machine automatically weighs and automatically inputs a correction value before production, and the purpose of correction is realized without manual weighing and manual input of the correction value; under the mutual cooperation of the weighing system, the control system and the correction module, the automatic correction is not needed to be stopped in the production process, and the errors caused by the fatigue loss of the conveying pump pipe and/or the metering errors caused by the change of the production environment are reduced. The liquid color master machine adopts a method of weighing system correction before production and real-time correction in the production process, and realizes high automation, accurate correction and accurate addition of liquid color master.
The invention provides the following technical scheme:
the invention relates to a weighing type liquid color master machine, which comprises a liquid color master barrel, a delivery pump, a weighing system, a limit alarm device, a correction module and a control system, wherein the delivery pump is arranged on the liquid color master barrel; the weighing system, the delivery pump, the limit alarm device and the correction module are connected with the control system through signal lines; it is characterized in that: the liquid color master barrel is connected with the delivery pump through a hose.
Furthermore, the liquid color master barrel is made of a plastic barrel, a glass barrel, an iron barrel or a stainless steel barrel.
Further, the volume of the liquid color master barrel is 0.01L-500L.
Further, the weighing system comprises a weighing sensor and a weighing transmitting module, or comprises an electronic scale and a weight output module.
Furthermore, the control system is realized through the control of a single chip microcomputer or a PLC.
Further, the delivery pump is a peristaltic pump, a screw pump, a gear pump, an injection pump or a diaphragm pump.
Further, an air-proof box is arranged outside the liquid color master barrel.
Further, a non-air-proof box is arranged outside the liquid color master barrel.
Furthermore, four corners of the bottom of the liquid color master machine are provided with foot pads or wheels.
Further, the limit alarm device comprises an upper limit alarm and a lower limit alarm; the upper limit alarm is weight which is not more than the maximum use limit value of the weighing sensor, and the lower limit alarm is weight which corresponds to the volume value from 1/20 liquid color master barrels to 1/3 liquid color master barrels.
The invention also discloses an automatic correction method of the weighing type liquid color master machine, which comprises the weighing type liquid color master machine and is characterized in that: the method comprises the following steps:
step 1: executing steps for automatic correction before production;
further, the step 1 further comprises: the control system sends a pulse driving signal to enable the conveying pump to add a certain amount of liquid color master, the weighing system sends the weight before and after adding to the control system, the control system calculates the weight change value of the liquid color master barrel in the period of time, the weight change value is a correction value, and the correction value is in a proportional relation with the pulse number; the control system calculates the planned addition amount of the liquid color master in the specified addition time according to the material weight of the plastic and the addition proportion of the liquid color master which are manually input and used each time during the plastic processing, calculates the corresponding pulse number through the relation between the correction value and the pulse number, and realizes the completion of the corresponding pulse number in the specified addition time through controlling the pulse frequency, thereby ensuring that the conveying pump realizes the addition of the liquid color master with the specified weight in the specified time.
Step 2: the steps are performed for automatic calibration in a production process.
The step 2 further comprises the following steps: the control system can acquire the weight value of the liquid color masterbatch barrel sent by the weighing system at regular time, calculate the actual output quantity of the liquid color masterbatch in a specific period, compare the actual output quantity with the planned output quantity, when the actual output quantity is consistent with the planned output quantity, the correction module is not started, and the delivery pump continues to deliver the liquid color masterbatch at the original output speed; and when the actual output quantity is not accordant with the planned output quantity, the correction module is started, the correction module determines whether to increase or reduce the pulse according to the deviation condition of the actual output quantity and the planned output quantity, and transmits the speed regulation scheme to the control system, the control system regulates the rotating speed of the delivery pump so as to control the output quantity of the liquid color master, and the rotating speed of the delivery pump is repeatedly regulated under the mutual cooperation of the weighing system, the control system and the correction module so as to ensure that the actual output quantity is accordant with the planned output quantity, so that the aim of automatic correction without stopping in the production process is finally fulfilled, and the accuracy of the addition quantity of the liquid color master is.
The invention also discloses a liquid color master machine applied to the processing process of the high polymer material, which comprises any one of the weighing type liquid color master machine and an automatic correction method of the weighing type liquid color master machine.
Compared with the prior art, the invention has the advantages that:
1. the weighing type liquid color master machine provided by the invention realizes no need of halt, automation and precision correction before and during production, and ensures the accuracy of the addition amount of the liquid color master during production.
2. According to the weighing type liquid color master machine, due to the design of the air-proof boxes and/or the shock-absorbing foot pads or the shock-absorbing wheels, the interference caused by wind and vibration in the external environment is avoided, and the accuracy of a weighing system is improved.
3. The weighing type liquid color masterbatch machine comprises a limit alarm device, when the weight of a liquid color masterbatch barrel exceeds an upper limit alarm value or is lower than a lower limit alarm value, the alarm device is started to remind that the liquid color masterbatch in the barrel needs to be taken out when the weight is overloaded or needs to be added when the weight is too small, and the influence of the shortage of the liquid color masterbatch on the subsequent production is prevented.
4. When the quality of the liquid color master barrel is lower than the minimum limit value, the alarm device is started to remind that the amount of the liquid color master in the barrel needs to be added less, and the liquid color master shortage is prevented from influencing the subsequent production.
5. The matching design of the weighing system and the control system realizes high automatic correction before production, saves the steps of manual weighing and manual correction value inputting, realizes real-time correction by the matching design of the weighing system, the control system and the correction module in the production process, and solves the problem of liquid color master output errors caused by gradual aging of a pump pipe, gradual deformation of a metering scale and change of production environment along with the prolonging of the service time of adding equipment.
6. The invention adopts multiple additions to calculate the weight change before and after the process, thereby solving the trouble that the weighing system can not accurately measure due to too small weight reduction in single addition. The weighing system weighs the liquid color concentrate in the bucket, which may be many times higher than the weight of a single addition, resulting in extremely high sensitivity requirements for symmetry, which becomes very expensive or even impossible to achieve.
7. Through long-term research and experiments, the inventor finds that in the prior art, a fixed metal pipe or a hard pipe is commonly used for connecting a liquid color master barrel and a delivery pump, so that the subsequent control system cannot be weighed accurately.
Drawings
FIG. 1 is a schematic diagram of a weighing type liquid color master machine, wherein a windproof box and an electronic scale are arranged outside a liquid color master barrel, and idler wheels are arranged at four corners of the bottom of the liquid color master machine.
FIG. 2 is a schematic diagram of a weighing type liquid color master machine, wherein a windproof box and an electronic scale are arranged outside a liquid color master barrel, and foot pads are arranged at four corners of the bottom of the liquid color master machine.
FIG. 3 is a schematic diagram of a part of function keys on a main interface of a touch display screen of the weighing type liquid color master machine.
Wherein: the device comprises an air-proof box 1, a liquid color masterbatch barrel 2, a weighing system 3, a delivery pump 4, a control system 6, a touch display screen 10, a limit alarm device 12, a correction module 13, a hose 14 and a support box body 15; the weighing sensor 7, the weighing transmission module 8 and the roller 11 in the embodiment 1, and the electronic scale 7, the weight output module 8 and the foot pad 11 in the embodiment 2.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
Example 1
As shown in fig. 1. A weighing type liquid color mother machine comprises a liquid color mother barrel 2, a weighing system 3, a delivery pump 4, a supporting box body 15, a limit alarm device 12, a control system 6 and a correction module 13; the liquid color mother barrel 2 is connected with the delivery pump 4 through a hose 14; the weighing system 3, the delivery pump 4, the limit alarm device 12 and the correction module 13 are connected with the control system 6 through signal lines.
The liquid color mother barrel 2 is made of a plastic barrel. The volume of the liquid color master barrel 2 is 10L. The weighing system 3 comprises a load cell 7 and a load transmitting module 8. The control system 6 is realized by a single chip microcomputer. The delivery pump 4 is a peristaltic pump. An air-proof box 1 is arranged outside the liquid color mother barrel 2. And idler wheels 11 are arranged at four corners of the bottom of the liquid color master batch machine.
The limit alarm device 12 has two functions of upper limit alarm and lower limit alarm, wherein the upper limit alarm is the maximum use limit value of the weighing system 3, and the lower limit alarm is the weight corresponding to the volume value of the 1/10 liquid color mother barrel 2.
Example 2
The invention relates to a weighing type liquid color mother machine which comprises a liquid color mother barrel 2, a weighing system 3, a delivery pump 4, a supporting box body 15, a limit alarm device 12, a control system 6 and a correction module 13. The liquid color mother barrel 2 is connected with the delivery pump 4 through a hose 14. The weighing system 3, the delivery pump 4, the limit alarm device 12 and the correction module 13 are connected with the control system 6 through signal lines.
The liquid color master barrel 2 is made of a stainless steel barrel. The volume of the liquid color master barrel 2 is 20L. The weighing system 3 comprises an electronic scale 7 and a weight output module 8. The control system 6 is realized by PLC control. The delivery pump 4 is a gear pump. An air-proof box 1 is arranged outside the liquid color mother barrel 2. Four corners of the bottom of the liquid color master machine are provided with foot pads 11.
The limit alarm device 12 has two functions of upper limit alarm and lower limit alarm, wherein the upper limit alarm is the maximum use limit value of the weighing system 3, and the lower limit alarm is the weight corresponding to the volume value of the 1/5 liquid color mother barrel 2.
Example 3
The position distribution and the function of each component of the weighing type liquid color master machine are described as follows by combining the weighing type liquid color master machine described in the embodiment 1 and the embodiment 2:
the weighing type liquid color master is mainly used for conveying the liquid color master to processing equipment accurately and quantitatively. The touch display screen 10 is placed on the side face of the air-proof box 1 in the embodiment 1, the touch display screen 10 is placed on the side face of the supporting box body 15 in the embodiment 2, and an operator can manually input the material weight of plastic used each time, the adding proportion and adding time of liquid color masterbatch and a correction period on the touch display screen 10 according to the specific using condition of the liquid color masterbatch; in the embodiment 1, the correction period is related to the adding time and is in a multiple relation with the adding time, the manually input correction period is 5 times, the adding time is 10s, and the correction period is 50 s; the correction period described in example 2 is related to the number of pulses and the frequency set in the control system 6, the frequency is fixed, the number of pulses can be designed to be a fixed value or an adjustable value, and the number of pulses described in example 2 is a fixed value of 1000, that is, the correction period is 5000 pulses.
The anti-wind box 1 is placed above the supporting box body 15, and the anti-wind box 1 is designed to prevent wind in the external environment from causing interference to the weighing system 3.
The liquid color master barrel 2 is used for containing liquid color master; the liquid color mother barrel 2 can be placed above the weighing sensor 7, below the weighing sensor 7, above the electronic scale 7 or below the electronic scale 7, and the weighing transmitting module 8 or the weight output module 8 is placed in the supporting box body 15; the weight of the liquid color master barrel 2 changes, deformation, pressure, displacement or current and voltage signals sensed by the weighing sensor 7 or the electronic scale 7 are different, the weighing and transmitting module 8 or the weight output module 8 converts the signals into signals which can be received by the control system 6 and outputs the signals to the control system 6, and the control system 6 acquires the weight value of the liquid color master barrel 2 through the transmission process; the liquid color master barrel 2 in the embodiment 1 is placed on a weighing sensor 7, a weighing and transmitting module 8 converts a deformation signal sensed by the weighing sensor 7 and transmits the converted deformation signal to a control system 6, and the control system 6 acquires a weight value of the liquid color master barrel 2; the liquid color masterbatch barrel 2 in the embodiment 2 is placed on an electronic scale 7, a weight output module 8 converts a pressure signal sensed by the electronic scale 7 and transmits the converted pressure signal to a control system 6, and the control system 6 acquires a weight value of the liquid color masterbatch barrel 2; the load cell 7 of example 1 is of the type MaVIN NA2 and the load cell module 8 is of the type BD300-N1 AD.
The limit alarm device 12, the control system 6 and the correction module 13 are arranged in the supporting box body 15; the limit alarm device 12 has two functions of an upper limit alarm and a lower limit alarm, wherein the upper limit alarm is the maximum use limit value of the weighing system 3, the lower limit alarm is the weight corresponding to the volume value from 1/20 to 1/3 of the liquid color mother barrel 2, the maximum use limit value of the weighing system 3 in the embodiments 1 and 2 is 60kg, the upper limit alarm is 60kg, the lower limit alarm is 1kg in the embodiment 1, and the lower limit alarm is 4kg in the embodiment 2, the upper limit alarm is designed to prevent the weight overload of the liquid color mother barrel 2 from influencing automatic correction, and the lower limit alarm is designed to prevent the liquid color mother from influencing normal production due to shortage; the control system 6 controls the output speed of the delivery pump 4, the start and stop of the correction module 13 and the start and stop of the limit alarm device 12; after the correction module 13 is started, it determines whether to increase or decrease the pulse according to the deviation between the actual output and the planned output, and transmits the speed regulation scheme to the control system 6, and the control system 6 adjusts the rotating speed of the delivery pump 4 so as to control the output of the liquid color masterbatch.
The motor part of the delivery pump 4 is arranged in the supporting box body 15, and the part of the delivery pump 4 for delivering the liquid color master is arranged outside the supporting box body 15; the motor part of the delivery pump 4 provides power for the part of the delivery pump 4 for delivering the liquid color master, and the delivery of the liquid color master is completed according to a pulse instruction sent by the control system 6.
Example 4
The working process of the color master machine applied to the processing process of the high polymer material by combining the embodiments 1 and 2 and the principle thereof are as follows:
step 1: after the liquid color masterbatch machine is powered on and started, a 'correction' button on the touch display screen 10 is clicked, at the moment, the conveying pump 4 starts to work, liquid color masterbatch in the liquid color masterbatch barrel 2 is conveyed out, the weight of the liquid color masterbatch barrel 2 changes, the weighing system 3 weighs weight values of the liquid color masterbatch barrel 2 before and after 30s according to 30s time signals transmitted by the control system 6, the weight values are transmitted to the control system 6 in a signal form, the control system 6 calculates the weight change value of the liquid color masterbatch barrel 2 in the period, the weight change value is a correction value, 5 time signals of 30s in a signal period transmitted by the control system 6 obtain 5 correction values, the control system 6 takes the average value of the 5 correction values to obtain an average correction value, and the average correction value is automatically recorded into a 'correction value' area on the touch display screen 10.
Step 2: clicking a simulation button, adjusting the output speed of the delivery pump 4 by the control system 6 according to the manually input material weight, the adding proportion, the adding time and the automatically input average correction value, outputting the liquid color masterbatch, finishing the simulated delivery of the liquid color masterbatch for 5 times according to the manually input simulation times, weighing the weight of the liquid color masterbatch barrel 2 before and after the 5 times of simulation times by the weighing system 3, transmitting the weight value to the control system 6 in a signal form, calculating by the control system 6 to obtain the actual output quantity of the liquid color masterbatch for the 5 times of simulation times, wherein the actual output quantity is consistent with the planned output quantity, and finishing the automatic correction before production.
And step 3: the hose 14 at the outlet end of the delivery pump 4 is inserted into a feeding port of the processing equipment, a 'start' button on the touch display screen 10 of the liquid color master machine is clicked, the delivery pump 4 is connected with the control system 6 through a signal line, and the control system 6 adjusts the output speed of the delivery pump 4 according to the manually input material weight, the adding proportion, the adding time and the automatically input average correction value, so that the adding amount of the liquid color master is controlled.
And 4, step 4: in the production process, the control system 6 acquires the weight value of the liquid color master barrel 2 fed back by the weighing system 3 at regular time, the control system 6 calculates the output quantity of the liquid color master in the correction period, the correction period is related to the adding time and is in a multiple relation with the adding time in the embodiment 1, the manual input correction period is 5 times, the adding time is 10s, and the correction period is 50 s; the correction period described in example 2 is related to the number of pulses and the frequency set in the control system 6, the frequency is fixed, the number of pulses can be designed to be a fixed value or an adjustable value, and the number of pulses described in example 2 is a fixed value of 1000, that is, the correction period is 5000 pulses. Because the volume of the liquid color master barrel 2 selected in the mass production is generally more than 10L, and because the densities of the liquid color masters with different colors are different, the weighing systems 3 of the embodiments 1 and 2 select a large range of 0-60kg, the minimum weighing value of the weighing system 3 is less than 0.2g, if the weighing system 3 with the lower minimum weighing value is selected, the price is too expensive, when the material weight is 1000g, the adding proportion of the liquid color masters is 0.01%, the planned output quantity of the liquid color masters within 10s of single adding time is 0.1g, which is less than the minimum weighing value of the weighing system 3, the weighing is not accurate, so the calibration cycle is designed, when the calibration cycle is 5 times and is 5 adding times, the planned output quantity of the liquid color masters within 50s is 0.5g and is greater than the minimum weighing value of the weighing system 3, and the problem that the weighing system 3 cannot accurately weigh is solved. The control system 6 compares the actual output quantity with the planned output quantity, when the actual output quantity is consistent with the planned output quantity, the correction module 13 is not started, and the delivery pump 4 continues to deliver the liquid color masterbatch at the original output speed; and when the actual output quantity does not accord with the planned output quantity, the correction module 13 is started, the correction module 13 determines whether to increase or decrease the pulse according to the deviation condition of the actual output quantity and the planned output quantity, and transmits the speed regulation scheme to the control system 6, the control system 6 regulates the rotating speed of the delivery pump 4 so as to control the output quantity of the liquid color master, and the rotating speed of the delivery pump 4 is repeatedly regulated under the mutual cooperation of the weighing system 3, the control system 6 and the correction module 13 so as to make the actual output quantity accord with the planned output quantity, so that the aim of automatic correction without stopping in the production process is finally achieved, and the accuracy of the addition quantity of the liquid color master is ensured.
And 5: in the production process, the control system 6 acquires that the weight of the liquid color master barrel 2 reaches the upper limit to alarm, the control system 6 transmits the signal to the limit alarm device 12, the limit alarm device 12 is started to give out a rumbling alarm to remind workers of taking out the overloaded liquid color master so as to avoid influencing the automatic correction of the liquid color master machine; because when the range of weighing system 3 and the volume of liquid color masterbatch bucket 2 are selected, also can avoid the condition of transshipping as far as possible to appear, so the condition that appears the upper limit and reports to the police under the general condition is few. And control system 6 gathers the weight of liquid look female bucket 2 and reaches the lower limit warning, and same limit alarm device 12 starts, sends out the rumbling warning, reminds the workman to need to add liquid look female to liquid look female bucket 2, prevents to influence normal production because of liquid look female shortage.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A weighing type liquid color mother machine comprises a liquid color mother barrel, a delivery pump, a weighing system, a limit alarm device, a correction module and a control system; the weighing system, the delivery pump, the limit alarm device and the correction module are connected with the control system through signal lines; it is characterized in that: the liquid color master barrel is connected with the delivery pump through a hose.
2. The weighing type liquid color master machine according to claim 1, characterized in that: the liquid color master barrel is made of a plastic barrel, a glass barrel, an iron barrel or a stainless steel barrel; the delivery pump is a peristaltic pump, a screw pump, a gear pump, an injection pump or a diaphragm pump; the volume of the liquid color mother barrel is 0.01L-500L.
3. The weighing type liquid color master machine according to claim 1, characterized in that: the weighing system comprises a weighing sensor and a weighing transmitting module, or comprises an electronic scale and a weight output module.
4. The weighing type liquid color master machine according to claim 1, characterized in that: the control system is realized by the control of a single chip microcomputer or a PLC.
5. The weighing type liquid color master machine according to claim 1, characterized in that: and a windproof box is arranged outside the liquid color master barrel or not.
6. The weighing type liquid color master machine according to claim 1, characterized in that: the limit alarm device comprises an upper limit alarm and a lower limit alarm; the upper limit alarm is weight which is not more than the maximum use limit value of the weighing sensor, and the lower limit alarm is weight which corresponds to the volume value from 1/20 liquid color master barrels to 1/3 liquid color master barrels.
7. A method for automatically calibrating a weight-based liquid color master machine, comprising a weight-based liquid color master machine according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
step 1: executing steps for automatic correction before production;
step 2: the steps are performed for automatic calibration in a production process.
8. The automatic calibration method of a weighing liquid color master machine according to claim 7, wherein: the step 1 further comprises the following steps: the control system sends a pulse driving signal to enable the conveying pump to add a certain amount of liquid color master, the weighing system sends the weight before and after adding to the control system, the control system calculates the weight change value of the liquid color master barrel in the period of time, the weight change value is a correction value, and the correction value is in a proportional relation with the pulse number; the control system calculates the planned addition amount of the liquid color master in the specified addition time according to the material weight of the plastic and the addition proportion of the liquid color master which are manually input and used each time during the plastic processing, calculates the corresponding pulse number through the relation between the correction value and the pulse number, and realizes the completion of the corresponding pulse number in the specified addition time through controlling the pulse frequency, thereby ensuring that the conveying pump realizes the addition of the liquid color master with the specified weight in the specified time.
9. The automatic calibration method of a weighing liquid color master machine according to claim 7, wherein: the step 2 further comprises the following steps: the control system can acquire the weight value of the liquid color masterbatch barrel sent by the weighing system at regular time, calculate the actual output quantity of the liquid color masterbatch within a specific adding frequency, compare the actual output quantity with the planned output quantity, when the actual output quantity is consistent with the planned output quantity, the correction module is not started, and the delivery pump continues to deliver the liquid color masterbatch at the original output speed; and when the actual output quantity is not accordant with the planned output quantity, the correction module is started, the correction module determines whether to increase or reduce the pulse according to the deviation condition of the actual output quantity and the planned output quantity, and transmits the speed regulation scheme to the control system, the control system regulates the rotating speed of the delivery pump so as to control the output quantity of the liquid color master, and the rotating speed of the delivery pump is repeatedly regulated under the mutual cooperation of the weighing system, the control system and the correction module so as to ensure that the actual output quantity is accordant with the planned output quantity, so that the aim of automatic correction without stopping in the production process is finally fulfilled, and the accuracy of the addition quantity of the liquid color master is.
10. The utility model provides a be applied to liquid color masterbatch machine in macromolecular material course of working which characterized in that: an automatic calibration method comprising the gravimetric liquid color master according to any one of claims 1 to 6 and the gravimetric liquid color master according to any one of claims 7 to 9.
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