Control method of extrusion coating machine servo valve
阅读说明：本技术 一种挤压涂布机伺服阀的控制方法 (Control method of extrusion coating machine servo valve ) 是由 丁杰 郑丽霞 李德胜 徐力 于 2019-11-29 设计创作，主要内容包括：本申请公开了一种挤压涂布机伺服阀的控制方法,依次包括如下步骤：S1确定涂布长度；S2根据涂布长度在PLC中运算处理得到凸轮轨道数据；S3外部编码器将当前凸轮轨道的实时数据传送给PLC；S4将PLC中运算处理的得到凸轮轨道数据与得到的实时数据对比,并通过时间戳模块控制涂布阀与回料阀输出相应的控制点。本发明降低了PLC程序的处理负荷；相比较总线模式下的伺服阀控制系统,本发明具有成本低、精度高、响应快的优点；相比脉冲输出控制模式下,本发明稳定性更高,定位更精准,程序简单。(The application discloses control method of extrusion coating machine servo valve includes following steps in proper order: s1 determining the coating length; s2, obtaining cam track data through calculation processing in the PLC according to the coating length; s3, the external encoder transmits the real-time data of the current cam track to the PLC; s4 compares the cam track data obtained by the operation process in the PLC with the real-time data obtained, and controls the coating valve and the material return valve to output corresponding control points through the timestamp module. The invention reduces the processing load of the PLC program; compared with a servo valve control system in a bus mode, the invention has the advantages of low cost, high precision and quick response; compared with a pulse output control mode, the invention has the advantages of higher stability, more accurate positioning and simple program.)
1. A control method of a servo valve of an extrusion coating machine is characterized by sequentially comprising the following steps:
s1 determining the coating length;
s2, obtaining cam track data through calculation processing in the PLC according to the coating length;
s3, the external encoder transmits the real-time data of the current cam track to the PLC;
s4 compares the cam track data obtained by the operation process in the PLC with the real-time data obtained, and controls the coating valve and the material return valve to output corresponding control points through the timestamp module.
2. The control method of the servo valve of the extrusion coater according to claim 1, wherein the opening heights and the opening speeds of the coating valve and the feed back valve are controlled by means of MODBUS communication after being processed by PLC operation.
3. The control method of the servo valve of the extrusion coater according to claim 1, wherein the coating valve and the feed back valve respectively establish four cams on the cam track and are rapidly output-controlled by the time stamp module.
4. The control method of the servo valve of the extrusion coater according to claim 1, wherein the coating valve and the loop material valve use a servo driver internal cam function, respectively.
Technical Field
The application relates to an extrusion coating machine, in particular to a control method of a servo valve of the extrusion coating machine.
Background
The coating machine has a wide application range, and the coating machine is used for coating a layer of glue, paint or printing ink with a specific function on a coiled substrate, drying and then rolling. With the development of science and technology, the coating precision of the coating machine is continuously improved, and simultaneously the speed is also continuously increased.
Due to the characteristics of the coating process, the coating length is ensured while the speed is increased, so that the response of the valve and the stability of operation are very important, and the action of the valve is controlled by a motor.
The existing scheme is as follows: by using the bus scheme, the synchronization cycle time of the bus is improved (the shorter the time is, the better the requirement on the PLC is), and the cam operation is carried out in the PLC to control the servo valve; a large amount of data are processed in the PLC through a pulse output function of the PLC, and then corresponding pulse quantity is sent to a servo driver to drive a servo motor.
However, in a bus mode, the servo system is high in cost, is not allowed to be dismounted under the condition of not cutting off the total power, otherwise, a motor encoder is easily damaged, and the problem of resetting of a material return valve in the conventional control system cannot be solved under the condition of not stopping the machine; the pulse control servo valve has the defects of weak anti-interference capability, easy processing of lost pulse phenomenon, large data processing amount in the PLC and low working efficiency of the PLC.
Disclosure of Invention
The invention aims to provide a control method of a servo valve of an extrusion coating machine, which improves the stability of a high-speed coating size, facilitates the maintenance of a servo system and reduces the cost of the whole system.
In order to achieve the above object, the present invention provides the following technical solutions.
The embodiment of the application discloses a control method of a servo valve of an extrusion coating machine, which sequentially comprises the following steps:
s1 determining the coating length;
s2, obtaining cam track data through calculation processing in the PLC according to the coating length;
s3, the external encoder transmits the real-time data of the current cam track to the PLC;
s4 compares the cam track data obtained by the operation process in the PLC with the real-time data obtained, and controls the coating valve and the material return valve to output corresponding control points through the timestamp module.
Preferably, in the control method of the servo valve of the extrusion coater, the opening heights and the opening speeds of the coating valve and the feed back valve are controlled by a MODBUS communication mode after being processed by a PLC operation.
Preferably, in the control method of the servo valve of the extrusion coater, the coating valve and the feed back valve respectively establish four cams on the cam track and are rapidly output and controlled by the time stamp module.
Preferably, in the above method for controlling a servo valve of a die coater, the coating valve and the return valve each use a servo driver internal cam function.
Compared with the prior art, the invention has the advantages that: the processing load of the PLC program is reduced; compared with a servo valve control system in a bus mode, the invention has the advantages of low cost, high precision and quick response; compared with a pulse output control mode, the invention has the advantages of higher stability, more accurate positioning and simple program.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flow chart illustrating a control method of a servo valve of an extrusion coater according to an embodiment of the present invention;
FIG. 2 is a schematic view of cam control on a cam track in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the method for controlling the servo valve of the extrusion coater sequentially comprises the following steps:
s1 determining the coating length;
s2, obtaining cam track data through calculation processing in the PLC according to the coating length;
s3, the external encoder transmits the real-time data of the current cam track to the PLC;
s4, comparing the cam track data obtained by the operation in the PLC with the real-time data obtained, and controlling the coating valve and the feed back valve to output corresponding control points through the timestamp module.
The opening height and the opening speed of the coating valve and the material return valve are controlled by a mode of MODBUS communication after PLC operation processing.
As shown in fig. 2, cam control on the cam track is shown, with the coating and return valves establishing four cams, respectively, running on the cam track.
Coating a valve: an application valve opening cam 1, an application
A material returning valve: the device comprises a material returning valve opening cam 1, a material returning
The cam 1 and the
According to the technical scheme, the processing load of the PLC program is reduced; compared with a servo valve control system in a bus mode, the invention has the advantages of low cost, high precision and quick response; compared with a pulse output control mode, the invention has the advantages of higher stability, more accurate positioning and simple program.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
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