阅读说明：本技术 一种液压同步控制方法 (Hydraulic synchronous control method ) 是由 谈源 杨倪宏 周瑞 钮青 丁琳 马晓伟 于 2020-07-30 设计创作，主要内容包括：本发明涉及同步性控制的技术领域,尤其涉及一种液压同步控制方法；至少一个液压同步控制单元；所述液压同步控制单元包括PLC控制单元、油缸单元、油泵单元和距离检测单元；所述油缸单元在所述油泵单元动力作用下,进行液压运动；所述距离检测单元设置在所述油缸单元上；所述PLC控制单元包括油泵电机控制单元和同步速度处理单元；所述油泵电机控制单元用于调控各个所述油泵单元中的油泵压力和流量；所述同步速度处理单元用于调整各个所述油泵单元中油泵的输出转速和油缸给定的输入流量。本发明的目的就是针对现有技术中存在的缺陷提供一种液压同步控制方法,保证液压控制的同步性,有效的防止成型误差大等问题的发生,极具实用性。(The invention relates to the technical field of synchronism control, in particular to a hydraulic synchronous control method; at least one hydraulic synchronization control unit; the hydraulic synchronous control unit comprises a PLC control unit, an oil cylinder unit, an oil pump unit and a distance detection unit; the oil cylinder unit performs hydraulic motion under the power action of the oil pump unit; the distance detection unit is arranged on the oil cylinder unit; the PLC control unit comprises an oil pump motor control unit and a synchronous speed processing unit; the oil pump motor control unit is used for regulating and controlling the pressure and flow of the oil pump in each oil pump unit; and the synchronous speed processing unit is used for adjusting the output rotating speed of an oil pump in each oil pump unit and the given input flow of an oil cylinder. The invention aims to provide a hydraulic synchronous control method aiming at the defects in the prior art, which ensures the synchronism of hydraulic control, effectively prevents the problems of large forming error and the like, and has high practicability.)

1. The hydraulic synchronous control method is characterized by comprising at least one hydraulic synchronous control unit; the hydraulic synchronous control unit comprises a PLC control unit, an oil cylinder unit, an oil pump unit and a distance detection unit; the plurality of oil cylinder units, the oil pump units and the distance detection units are controlled by the PLC control unit; the oil cylinder unit performs hydraulic motion under the power action of the oil pump unit; the distance detection unit is arranged on the oil cylinder unit and used for detecting the hydraulic distance of the oil cylinder unit and calculating the speed according to the hydraulic distance; the PLC control unit comprises an oil pump motor control unit and a synchronous speed processing unit; the oil pump motor control unit is used for regulating and controlling the pressure and flow of the oil pump in each oil pump unit; and the synchronous speed processing unit is used for adjusting the output rotating speed of an oil pump in each oil pump unit and the given input flow of an oil cylinder.

2. The hydraulic synchronous control method according to claim 1, characterized in that the oil pump pressure control method of the oil pump motor control unit includes the steps of:

the method comprises the following steps: inputting pressure values of all oil pumps, and comparing several groups of pressure values to monitor whether abnormal data occur or not;

step two; if the oil pump is abnormal, selecting an abnormal oil pump according to the abnormal data; regulating the rotating speed of the abnormal oil pump until the abnormal oil pump is normal;

step three; if no abnormity exists, the average pressure value is calculated, and the rotating speed of each oil pump is recorded and maintained according to the average value.

3. The hydraulic synchronous control method according to claim 1, characterized in that the oil pump flow rate control method of the oil pump motor control unit includes the steps of:

the method comprises the following steps: inputting the flow values of each oil pump, comparing several groups of flow values with each other, and monitoring whether abnormal data occur or not;

step two; if the oil pump is abnormal, selecting an abnormal oil pump according to the abnormal data; regulating the output flow of the abnormal oil pump until the abnormal oil pump is normal;

step three; if no abnormity exists, the average flow value is calculated, and the output flow of each oil pump is recorded and kept according to the average value.

4. The hydraulic synchronous control method according to claim 1, characterized in that the control method of the synchronous speed processing unit includes the steps of:

the method comprises the following steps: the distance detection unit detects the hydraulic distance of the oil cylinder unit, the speed calculated through the hydraulic distance is compared with the speed set value of the oil cylinder unit, and whether the speed calculated through the hydraulic distance is the same as the speed set value of the oil cylinder unit is detected;

step two: if the oil cylinder number is different, selecting a problem oil cylinder, calculating the rotating speed required by the oil pump through a PID algorithm, and comparing the rotating speed required by the oil pump with a rotating speed set value of the oil pump unit; if the oil cylinder reaches the set position, judging whether the oil cylinder reaches the set position, and before the oil cylinder does not reach the set position, keeping the displacement of the oil cylinder until the oil cylinder reaches the set position and then stopping the oil cylinder;

step three: if the rotating speed exceeds +/-5% of the rotating speed set value of the oil pump unit, alarming, firstly adjusting the upper limit and the lower limit of the rotating speed of the problem oil cylinder through an externally arranged adjusting mechanism, then adjusting the rotating speed of the problem oil cylinder through an internally arranged adjusting mechanism, and then calculating the rotating speed required by the oil pump through a PID algorithm until the rotating speed falls into the rotating speed set value range of the oil pump unit; if the rotating speed does not exceed +/-5% of the rotating speed set value of the oil pump unit, directly adjusting the rotating speed of the problematic oil cylinder by an internally arranged adjusting mechanism, and calculating the rotating speed required by the oil pump through a PID algorithm until the rotating speed falls into the rotating speed set value range of the oil pump unit;

step four: and detecting the hydraulic distance of the oil cylinder unit through the distance detection unit to calculate the adjusted distance change speed of the problem oil cylinder, and inputting the distance change speed into the first step to compare the distance change speed with the set value.

5. The hydraulic synchronous control method according to claim 1, characterized by further comprising an operation unit; the operation unit is a touch screen and is connected with the PLC control unit.

6. The hydraulic synchronous control method according to any one of claims 1 to 5, wherein the distance detection means is a linear scale.

Technical Field

The invention relates to the technical field of synchronism control, in particular to a hydraulic synchronous control method.

Background

Carbon glass mixes fabric wide application in new energy automobile shell part, however general carbon glass mixes fabric course of working loaded down with trivial details, needs to carry out the preforming to carbon glass mixes fabric earlier. The production and processing of the carbon-glass mixed fabric are to carry out a pre-shaping process on a multi-layer fabric, finish the shaping of a shape on the soft multi-layer fabric in advance through a mould, then carry out pressure forming by injecting glue such as resin and the like, and finally carry out numerical control cutting to produce a finished product. The forming press and its matched mould, heating and hydraulic systems are all automatically controlled by its press system.

In the hydraulic forming process, each oil cylinder of the hydraulic machine must ensure synchronism, otherwise, the forming error is large, and even the machine is damaged. The hydraulic system in the prior art is difficult to ensure the hydraulic synchronism.

In view of the above problems, the designer actively makes research and innovation based on the practical experience and professional knowledge that the engineering of such products is applied for many years and by cooperating with the application of the theory, so as to design the hydraulic synchronous control method, ensure the synchronism of hydraulic control, effectively prevent the problems of large forming error and the like, and has great practicability.

Disclosure of Invention

The invention aims to provide a hydraulic synchronous control method aiming at the defects in the prior art, which ensures the synchronism of hydraulic control, effectively prevents the problems of large forming error and the like, and has high practicability.

In order to achieve the purpose, the invention adopts the technical scheme that:

a method for controlling the hydraulic pressure synchronously,

the method comprises the following steps:

at least one hydraulic synchronization control unit; the hydraulic synchronous control unit comprises a PLC control unit, an oil cylinder unit, an oil pump unit and a distance detection unit; the plurality of oil cylinder units, the oil pump units and the distance detection units are controlled by the PLC control unit; the oil cylinder unit performs hydraulic motion under the power action of the oil pump unit; the distance detection unit is arranged on the oil cylinder unit and used for detecting the hydraulic distance of the oil cylinder unit and calculating the speed according to the hydraulic distance; the PLC control unit comprises an oil pump motor control unit and a synchronous speed processing unit; the oil pump motor control unit is used for regulating and controlling the pressure and flow of the oil pump in each oil pump unit; and the synchronous speed processing unit is used for adjusting the output rotating speed of an oil pump in each oil pump unit and the given input flow of an oil cylinder.

Further, the oil pump pressure control method of the oil pump motor control unit includes the steps of:

the method comprises the following steps: inputting pressure values of all oil pumps, and comparing several groups of pressure values to monitor whether abnormal data occur or not;

step two; if the oil pump is abnormal, selecting an abnormal oil pump according to the abnormal data; regulating the rotating speed of the abnormal oil pump until the abnormal oil pump is normal;

step three; if no abnormity exists, the average pressure value is calculated, and the rotating speed of each oil pump is recorded and maintained according to the average value.

Further, the oil pump flow control method of the oil pump motor control unit includes the steps of:

the method comprises the following steps: inputting the flow values of each oil pump, comparing several groups of flow values with each other, and monitoring whether abnormal data occur or not;

step two; if the oil pump is abnormal, selecting an abnormal oil pump according to the abnormal data; regulating the output flow of the abnormal oil pump until the abnormal oil pump is normal;

step three; if no abnormity exists, the average flow value is calculated, and the output flow of each oil pump is recorded and kept according to the average value.

Further, the control method of the synchronous speed processing unit includes the steps of:

the method comprises the following steps: the distance detection unit detects the hydraulic distance of the oil cylinder unit, the speed calculated through the hydraulic distance is compared with the speed set value of the oil cylinder unit, and whether the speed calculated through the hydraulic distance is the same as the speed set value of the oil cylinder unit is detected;

step two: if the oil cylinder number is different, selecting a problem oil cylinder, calculating the rotating speed required by the oil pump through a PID algorithm, and comparing the rotating speed required by the oil pump with a rotating speed set value of the oil pump unit; if the oil cylinder reaches the set position, judging whether the oil cylinder reaches the set position, and before the oil cylinder does not reach the set position, keeping the displacement of the oil cylinder until the oil cylinder reaches the set position and then stopping the oil cylinder;

step three: if the rotating speed exceeds +/-5% of the rotating speed set value of the oil pump unit, alarming, firstly adjusting the upper limit and the lower limit of the rotating speed of the problem oil cylinder through an externally arranged adjusting mechanism, then adjusting the rotating speed of the problem oil cylinder through an internally arranged adjusting mechanism, and then calculating the rotating speed required by the oil pump through a PID algorithm until the rotating speed falls into the rotating speed set value range of the oil pump unit; if the rotating speed does not exceed +/-5% of the rotating speed set value of the oil pump unit, directly adjusting the rotating speed of the problematic oil cylinder by an internally arranged adjusting mechanism, and calculating the rotating speed required by the oil pump through a PID algorithm until the rotating speed falls into the rotating speed set value range of the oil pump unit;

step four: and detecting the hydraulic distance of the oil cylinder unit through the distance detection unit to calculate the adjusted distance change speed of the problem oil cylinder, and inputting the distance change speed into the first step to compare the distance change speed with the set value.

Further, the device also comprises an operation unit; the operation unit is a touch screen and is connected with the PLC control unit.

Further, the distance detection unit is a linear ruler.

Through the technical scheme of the invention, the following technical effects can be realized:

the hydraulic synchronous control units are arranged in the hydraulic machine, so that the synchronism of hydraulic control is ensured, all oil cylinders are synchronously pressed down and lifted, the problems of large forming error and the like are effectively prevented, and the hydraulic synchronous control device has high practicability.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a hydraulic synchronous control unit of a hydraulic synchronous control method according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an oil pump motor control unit of the hydraulic synchronous control method in the embodiment of the invention;

fig. 3 is a schematic structural diagram of a synchronous speed processing unit of the hydraulic synchronous control method according to the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described 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 of the embodiments.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

A hydraulic synchronization control method, as shown in fig. 1 to 3, includes:

at least one hydraulic synchronization control unit; the hydraulic synchronous control unit comprises a PLC control unit, an oil cylinder unit, an oil pump unit and a distance detection unit; the plurality of oil cylinder units, the oil pump units and the distance detection units are controlled by the PLC control unit; the oil cylinder unit performs hydraulic motion under the power action of the oil pump unit; the distance detection unit is arranged on the oil cylinder unit and used for detecting the hydraulic distance of the oil cylinder unit and calculating the speed according to the hydraulic distance; the PLC control unit comprises an oil pump motor control unit and a synchronous speed processing unit; the oil pump motor control unit is used for regulating and controlling the pressure and flow of the oil pump in each oil pump unit; and the synchronous speed processing unit is used for adjusting the output rotating speed of an oil pump in each oil pump unit and the given input flow of an oil cylinder.

Specifically, the hydraulic synchronous control unit is mainly controlled by the PLC control unit to perform signal reduction and processing, the input signals of the PLC control unit are distance information from the detection unit, hydraulic oil pressure information returned from the oil pump unit, oil pump flow information, and the like, and the hydraulic distance is a hydraulic displacement distance. The number of each group of the oil cylinder unit, the oil pump unit and the distance detection unit can be set according to the actual processing requirement, and is uniformly exemplified by four in each group.

As a preferable example of the above embodiment, as shown in fig. 1 to 3, the oil pump pressure control method of the oil pump motor control unit includes the steps of:

the method comprises the following steps: inputting pressure values of all oil pumps, and comparing several groups of pressure values to monitor whether abnormal data occur or not;

step two; if the oil pump is abnormal, selecting an abnormal oil pump according to the abnormal data; regulating the rotating speed of the abnormal oil pump until the abnormal oil pump is normal;

step three; if no abnormity exists, the average pressure value is calculated, and the rotating speed of each oil pump is recorded and maintained according to the average value.

Specifically, the control method of the oil pump motor control unit mainly compares the oil pump pressure and the oil pump flow rate, and adjusts the output pressure and the output flow rate of a plurality of groups of oil pumps and oil cylinders with the same function to be consistent. This control is performed whether or not the press-down or press-up action is performed.

As a preferable example of the above embodiment, as shown in fig. 1 to 3, the oil pump flow rate control method of the oil pump motor control unit includes the steps of:

the method comprises the following steps: inputting the flow values of each oil pump, comparing several groups of flow values with each other, and monitoring whether abnormal data occur or not;

step two; if the oil pump is abnormal, selecting an abnormal oil pump according to the abnormal data; regulating the output flow of the abnormal oil pump until the abnormal oil pump is normal;

step three; if no abnormity exists, the average flow value is calculated, and the output flow of each oil pump is recorded and kept according to the average value.

As a preferable example of the above embodiment, as shown in fig. 1 to 3, the method for controlling the synchronous speed processing unit includes the steps of:

the method comprises the following steps: the distance detection unit detects the hydraulic distance of the oil cylinder unit, the speed calculated through the hydraulic distance is compared with the speed set value of the oil cylinder unit, and whether the speed calculated through the hydraulic distance is the same as the speed set value of the oil cylinder unit is detected;

step two: if the oil cylinder number is different, selecting a problem oil cylinder, calculating the rotating speed required by the oil pump through a PID algorithm, and comparing the rotating speed required by the oil pump with a rotating speed set value of the oil pump unit; if the oil cylinder reaches the set position, judging whether the oil cylinder reaches the set position, and before the oil cylinder does not reach the set position, keeping the displacement of the oil cylinder until the oil cylinder reaches the set position and then stopping the oil cylinder;

step three: if the rotating speed exceeds +/-5% of the rotating speed set value of the oil pump unit, alarming, firstly adjusting the upper limit and the lower limit of the rotating speed of the problem oil cylinder through an externally arranged adjusting mechanism, then adjusting the rotating speed of the problem oil cylinder through an internally arranged adjusting mechanism, and then calculating the rotating speed required by the oil pump through a PID algorithm until the rotating speed falls into the rotating speed set value range of the oil pump unit; if the rotating speed does not exceed +/-5% of the rotating speed set value of the oil pump unit, directly adjusting the rotating speed of the problematic oil cylinder by an internally arranged adjusting mechanism, and calculating the rotating speed required by the oil pump through a PID algorithm until the rotating speed falls into the rotating speed set value range of the oil pump unit;

step four: and detecting the hydraulic distance of the oil cylinder unit through the distance detection unit to calculate the adjusted distance change speed of the problem oil cylinder, and inputting the distance change speed into the first step to compare the distance change speed with the set value.

Specifically, the control method of the synchronous speed processing unit is that the change value of the distance detection unit is used as an adjustment parameter in the action process of the oil cylinder, at this time, the output rotating speed of the oil pump or the input flow given by the oil cylinder is directly adjusted, if the overshoot condition of the distance detection unit occurs in the process, an adjustment mechanism arranged outside is used for manual repair after alarming, and the condition that the distance value of the distance detection unit is reached after the adjustment is finished is used as a judgment condition.

As a preferable example of the above embodiment, as shown in fig. 1 to 3, the apparatus further includes an operation unit; the operation unit is a touch screen and is connected with the PLC control unit.

As shown in fig. 1 to 3, the distance detecting means is preferably a linear scale.

The foregoing illustrates and describes the principles, general features, and advantages of the present 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 described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present 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.