阅读说明：本技术 一种压出挤出机螺杆转数预置的控制方法 (Control method for presetting screw revolution of extruding machine ) 是由 王文举 郝树德 杨亮 夏淑文 于 2020-05-20 设计创作，主要内容包括：本发明公开了一种压出挤出机螺杆转数预置的控制方法,挤出机内安装探测胶料温度的温度传感器,挤出机和温度传感器均与MES系统连接；包括,MES系统检测并记录挤出机停机时间段内胶料温度；MES系统根据停机时间内胶料温度变化值ΔT,对挤出机螺杆转数设定值R<Sub>0</Sub>和联动线速度设定值V<Sub>0</Sub>进行补偿；补偿后挤出机螺杆转数R和联动线速度V的持续时间t<Sub>1</Sub>及恢复时间t<Sub>2</Sub>设定；本发明基于MES系统与压出挤出机及联动线的有效配合,根据挤出机内胶料温度的变化对挤出机螺杆转数与联动线速度进行补偿,使挤出机一键启动后挤出制品重量值快速稳定,大大降低了挤出胶料制品不良率的产生,有效解决了现有技术中一键启动后挤出胶料制品重量值波动时间长、波动幅度大的问题。(The invention discloses a control method for presetting the number of revolutions of a screw of an extruding machine, wherein a temperature sensor for detecting the temperature of a sizing material is arranged in the extruding machine, and the extruding machine and the temperature sensor are both connected with an MES system; the method comprises the steps that an MES system detects and records the temperature of the sizing material in the shutdown time period of an extruder; the MES system sets a set value R for the rotation number of the screw of the extruder according to the temperature change value delta T of the sizing material in the shutdown time 0 And linkage linear speed set value V 0 Performing compensation; compensated extruder screw revolution R and duration t of linkage linear velocity V 1 And recovery time t 2 Setting; based on the effective matching of the MES system, the extrusion extruder and the linkage line, the invention compensates the screw revolution of the extruder and the linkage line speed according to the temperature change of the sizing material in the extruder, so that the weight value of the extruded product is fast and stable after the extruder is started by one key, the reject ratio of the extruded sizing material product is greatly reduced, and the problems of long fluctuation time and large fluctuation amplitude of the weight value of the extruded sizing material product after the extruder is started by one key in the prior art are effectively solved.)

1. A preset control method for the screw revolution of an extruding machine is characterized in that a temperature sensor for detecting the temperature of rubber materials is arranged in the extruding machine, and the extruding machine and the temperature sensor are both connected with an MES system; the method comprises the following steps:

s1) detecting and recording the temperature of the sizing material in the shutdown time period of the extruder by the MES system; when the MES system detects that the extruder is stopped, the MES system records the temperature value of the sizing material at the moment; when the MES system detects that the shutdown of the extruder is finished, the rubber temperature value at the moment is recorded; calculating and storing a change value delta T of the temperature of the sizing material in the shutdown time by the MES system;

s2) the MES system sets the rotation number R of the extruder screw according to the temperature change value delta T of the sizing material in the stop time₀And linkage linear speed set value V₀Performing compensation; the compensated screw revolution R and linkage linear speed V of the extruder are as follows;

R＝R₀+2R₀·ΔT％ formula (1)

V＝V₀+V₀Δ T% formula (2)

S3) compensating the screw revolution R of the extruder and the duration t of the linkage linear speed V₁And recovery time t₂Setting; maintaining time t of compensated extruder R and linkage linear speed V₁Satisfy t₁10 Δ T; recovery time t₂Satisfy t₂10 Delta T, i.e. the number of revolutions R of the extruder screw and the linkage linear speed V at T₂And restoring the compensated parameters to the set values in time.

2. The preset control method for the screw revolution of the extrusion extruder as claimed in claim 1, wherein the MES system has a function of monitoring the extruder current on line, and when the MES system monitors that the extruder current becomes 0-10A, the MES system is regarded as the stop starting time and records the time point; when the MES system monitors that the extruder current is 150-200A, the MES system is regarded as the shutdown end time, and the time point at the moment is recorded.

3. The preset control method for the screw revolution of the extrusion machine according to claim 1, wherein the MES system is connected to the continuous scale and the weight marking device, respectively, the rubber product extruded by the extrusion machine is continuously weighed by the continuous scale, the rubber product is continuously weighed by the continuous scale, the MES system compares the weighed value with a preset weight value range for judgment, and if the weight of the rubber product is not qualified, the rubber product is marked by the weight marking device for waste treatment.

4. An extrusion extruder screw revolution preset control method according to claim 1, wherein the temperature sensor is installed at a plasticizing section of the extruder or an extrusion section of the extruder.

Technical Field

The invention relates to the technical field of extruder control, in particular to a control method for presetting the number of revolutions of a screw of an extruder.

Background

In the production operation of the traditional extruding machine, the skill level or the operation method of the operator of the extruding machine has great influence on the qualification rate and the production efficiency of the extruded rubber products, so the solidification of the production operation conditions or the production parameters is particularly important. In the prior art, one-key starting replaces manual operation to automatically start an extruder so as to reduce the reject ratio caused by manual operation factors, namely, the one-key starting refers to presetting starting parameters such as the rotation number of a screw rod of the extruder, the linear velocity of linkage, the glue supply width and the like through an MES (manufacturing execution system), starting the production of the extruder, one-key starting, selecting the preset production parameters of the MES according to the specification of a product for producing a sizing material, and adjusting the extruder to the preset parameter values through the MES so as to carry out extrusion production.

Although one-key start-up operation of the extruder can reduce the reject rate caused by manual operation factors, the following disadvantages still exist in the prior art: when the rubber compound product is extruded, the temperature and the mixing degree of the rubber compound have obvious influence on the shrinkage and expansion of the rubber compound, when the extruder is stopped due to the change of the product specification or abnormal shutdown, the temperature of the rubber material is gradually reduced, after the extruder is stopped and is started by one key, various parameters of an extruder screw and a linkage line are quickly increased to preset values of an MES system (the parameters can be increased to the preset values in 10 seconds) and the reduction of the temperature of the rubber material can cause the instability of the weight value of an extruded rubber material product, the weight of the extruded rubber material product is heavy in the early stage and light in the later stage, and finally the weight of the extruded rubber material product is recovered to a qualified range, the duration of the process is about 5 minutes, the extrusion speed of the rubber material is generally 20-30 m/min, namely, the weight value of 100-150 m extruded rubber material products fluctuates, the fluctuation range of the weight value is large, and the products with the weight value fluctuation exceeding the standard weight range can only be marked and cut out to be processed as waste materials. Therefore, the quality of the rubber product is seriously influenced by the weight value fluctuation with long time and large amplitude, and the qualification rate of the product is greatly reduced.

Disclosure of Invention

In order to solve the problems that the extrusion extruder is finished due to the condition of specification replacement or abnormal shutdown and the like, after the extruder is started by one key, the weight value of an extruded sizing material product is heavy first and then light, the fluctuation range of the weight value is large, the fluctuation time is long, and the stability is poor, the invention provides the control method for presetting the rotation number of the screw of the extrusion extruder.

The technical scheme adopted by the invention is as follows:

a control method for presetting the screw revolution of an extruding machine is characterized in that a temperature sensor for detecting the temperature of rubber materials is arranged in the extruding machine, and the extruding machine and the temperature sensor are both connected with an MES system; the method comprises the following steps:

s1) detecting and recording the temperature of the sizing material in the shutdown time period of the extruder by the MES system; when the MES system detects that the extruder is stopped, the MES system records the temperature value of the sizing material at the moment; when the MES system detects that the shutdown of the extruder is finished, the rubber temperature value at the moment is recorded; calculating and storing a change value delta T of the temperature of the sizing material in the shutdown time by the MES system;

s2) the MES system sets the rotation number R of the extruder screw according to the temperature change value delta T of the sizing material in the stop time₀And linkage linear speed set value V₀Performing compensation; the compensated screw revolution R and linkage linear speed V of the extruder are as follows;

R＝R₀+2R₀Δ T% formula (1)

V＝V₀+V₀Δ T% formula (2)

S3) compensating the screw revolution R of the extruder and the duration t of the linkage linear speed V₁And recovery time t₂Setting; maintaining time t of compensated extruder R and linkage linear speed V₁Satisfy t₁10 Δ T; recovery time t₂Satisfy t₂10 Delta T, i.e. the number of revolutions R of the extruder screw and the linkage linear speed V at T₂And restoring the compensated parameters to the set values in time.

When the extrusion operation is carried out, the extruder is stopped due to the change of the product specification or abnormity, the extruder is started by one key, the MES system carries out compensation adjustment on the screw revolution of the extruder and the linkage linear speed according to the change value of the temperature of the rubber material in the extruder when the shutdown is started and when the shutdown is finished, and the compensated screw revolution of the extruder is recovered to a set value within a set time after being kept for a certain time; by the control method, the problems of heavy weight in the early stage and light weight in the later stage of the extruded rubber material product caused by the reduction of the temperature of the rubber material in the extruder due to shutdown are effectively solved, the fluctuation of the weight value of the rubber material product is greatly improved, the PPK value (the process performance index of the product) of the weight process capability of the product is improved, and all parameters of the equipment are not required to be adjusted by manual work after one-key startup.

Preferably, the MES system has the function of monitoring the current of the extruder on line, and when monitoring that the current of the extruder is 0-10A, the MES system is regarded as the shutdown starting time and records the time point at the moment; when the MES system monitors that the extruder current is 150-200A, the MES system is regarded as the shutdown end time, and the time point at the moment is recorded. The recording of the downtime realizes the accurate inquiry and tracing of the effective production time of the shift production, the product specification replacement time and the exception handling time, and provides data support for the calculation and improvement of the production efficiency.

Preferably, the MES system is connected with the continuous weighing and weight marking device respectively, the rubber products extruded by the extruder are continuously weighed by the continuous weighing, the rubber products are continuously weighed by the continuous weighing, the MES system compares and judges the weighing value with a preset weight value range, if the weight of the rubber products is unqualified, the rubber products are marked by the weight marking device to be processed as waste, and the rubber products with unqualified weight values are prevented from entering the next process to cause larger production cost loss.

Preferably, the temperature sensor is arranged at a plasticizing section of the extruder or an extruding section of the extruder, so that the temperature sensor is in contact with the rubber material in the extruder to accurately detect the temperature of the rubber material.

Compared with the prior art, the control method for presetting the screw revolution of the extruding machine, provided by the invention, has the advantages that the screw revolution of the extruding machine and the speed of the linkage line are compensated and adjusted according to the change of the temperature of the rubber material in the extruding machine based on the effective matching of the MES system, the extruding machine and the linkage line, so that the following effects are realized:

(1) after the extruder is stopped, the extruder is started by one key, and the rotation number of the screw of the extruder and the linkage linear speed are automatically compensated and adjusted according to the control method, so that the weight value of the extruded product is fast and stable, the reject ratio of the extruded rubber product is greatly reduced, and the problems of long fluctuation time and large fluctuation amplitude of the weight value of the extruded rubber product after one-key start in the prior art are effectively solved; the control method provided by the invention can reduce the weight value fluctuation length of the extruded rubber material product of 100-150 meters caused by one-key starting operation in the prior art to the product weight value fluctuation length of only 20-40 meters, and the product failure rate is reduced by 60-80%.

(2) The downtime is accurately recorded by the MES system, so that the accurate query and tracing of the effective production time of a shift production, the product specification replacement time and the exception handling time are realized, and data support is provided for the calculation and improvement of the production efficiency.

(3) After the extruder is started by one key, the screw revolution and the linkage linear speed of the extruder are automatically compensated and adjusted according to the control method, and various parameters of equipment do not need to be manually adjusted, so that the reject ratio caused by manual operation is avoided.

Drawings

FIG. 1 is a schematic diagram of a control method provided by the present invention;

FIG. 2 is a schematic view of the extruder of the present invention;

FIG. 3 is a graph showing the trend of the number of rotations of the screw of the extruder with time;

FIG. 4 is a prior art screw-on extruder screw-on extrusion compound product meter weight fluctuation curve;

FIG. 5 is a plot of the variation in the weight per meter of an extruded gum product after a key start of the extruder using the control method of the present invention.

Reference numerals: 1. an extruder frame; 2. a head of the extruder; 3. an extruder barrel; 4. an extruder screw; 5. an extruder power system; 6. a feed port of the extruder; 7. an extruder pin; 8. a temperature sensor.

Detailed Description

In order that those skilled in the art will be better able to understand the present invention, the following detailed description of the invention is given in conjunction with the accompanying drawings.

A control method for presetting the screw revolution of an extruder is disclosed, as shown in figure 2, a temperature sensor 8 for detecting the temperature of rubber materials is arranged in the body of the extruder, the extruder and the temperature sensor 8 are both connected with an MES system, and the temperature sensor 8 is arranged at the plasticizing section of the extruder or the extruding section of the extruder for accurately detecting the temperature of the rubber materials; the control method, as shown in fig. 1, includes the following steps:

s1) detecting and recording the temperature of the sizing material in the shutdown time period of the extruder by the MES system; when the MES system detects that the extruder is stopped, the MES system records the temperature value of the sizing material at the moment; when the MES system detects that the shutdown of the extruder is finished, the rubber temperature value at the moment is recorded; calculating and storing a change value delta T of the temperature of the sizing material in the shutdown time by the MES system;

s2) the MES system sets the rotation number R of the extruder screw according to the temperature change value delta T of the sizing material in the stop time₀And linkage linear speed set value V₀Performing compensation; the compensated screw revolution R and linkage linear speed V of the extruder are as follows;

R＝R₀+2R₀Δ T% formula (1)

V＝V₀+V₀Δ T% formula (2)

S3) compensating the screw revolution R of the extruder and the duration t of the linkage linear speed V₁And recovery time t₂Setting; maintaining time t of compensated extruder R and linkage linear speed V₁Satisfy t₁10 Δ T; recovery time t₂Satisfy t₂10 Delta T, i.e. the number of revolutions R of the extruder screw and the linkage linear speed V at T₂And restoring the compensated parameters to the set values in time.

In the above formula, Δ T is only the value of the temperature change of the cement during the shutdown time, not the unit thereof.

Screw revolution R of compensated extruder, linkage linear speed V and retention time t of compensated parameters₁And recovery time t₂The specific correspondence relationship with the temperature change value Δ T is shown in table 1:

table 1 corresponding relation

Taking the revolution of the screw of the extruder as an example, fig. 3 shows the change trend of the revolution of the screw of the extruder along with time, after one key is started, the MES system compensates and adjusts the revolution of the screw of the extruder according to the temperature change value of rubber materials in the extruder, the revolution of the screw of the extruder is rapidly increased to the compensated value, the process is extremely short in time consumption, and the required time is ignored; the compensated revolution R of the extruder screw is t₁Is kept constant for a time period of, and then at t₂The set value R of the screw revolution of the extruder is recovered within the time₀Then according to the original set value R₀And (5) carrying out extrusion production.

The MES system is connected with the continuous weighing and weight marking device respectively, the sizing material product extruded by the extruder is weighed continuously by the continuous weighing on the linkage line, the weighing value is compared and judged with the preset weight value range by the MES system, and if the weight of the sizing material product exceeds the standard weight value range set by the MES system, the sizing material product is marked by the weight marking device to be treated as waste.

In order to realize accurate inquiry and tracing of the effective production time, the product specification replacement time and the abnormal processing time of a shift production and provide data support for calculation and improvement of production efficiency, the MES system has the function of monitoring the current of the extruder on line, and when monitoring that the current of the extruder is changed to 0-10A, the MES system is regarded as the shutdown starting time and records the time point at the moment; when the MES system monitors that the extruder current is 150-200A, the MES system is regarded as the shutdown end time, and the time point at the moment is recorded.

In this example, the weight value of the extruded rubber-based product is expressed in terms of the weight per meter of the rubber-based product, which is the weight per meter of the extruded rubber-based product in kg/m. Fig. 4 is a rice weight fluctuation curve of an extruded rubber product after one-key start of an extruder in the prior art, fig. 5 is a rice weight fluctuation curve of an extruded rubber product after one-key start of an extruder adopting the control method of the present invention, in the figure, the abscissa is the length of the extruded rubber product, the ordinate is the rice weight of the extruded rubber product, and the dotted line range is a standard weight value range; from the comparison between fig. 4 and fig. 5, it can be seen that the fluctuation amplitude and the fluctuation time of the weight value of the extruded rubber product are both obviously reduced by the control method provided by the present invention: after the extruder in the prior art is started by one key, the meter weight of an extruded rubber product has fluctuation of 120 meters exceeding the range of the standard weight value, the length of the fluctuation of the meter weight of the product exceeding the range of the standard weight value is reduced to 32 meters after the control method provided by the invention is adopted, and the reject ratio of the rubber product is reduced by 73 percent.

The control method for presetting the screw revolution of the extruder provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and central concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.