阅读说明：本技术 一种发泡注料流量分段式控制系统及其控制方法 (Sectional type control system and method for foaming injection flow ) 是由 叶小三 刘鹏 巩建乐 吴园 于 2021-08-04 设计创作，主要内容包括：本发明公开了一种发泡注料流量分段式控制系统及其控制方法,涉及冰箱发泡技术领域。本发明包括主控模块和流量控制模块；流量控制模块用于接收主控模块发送的发泡剂流量设定值,以及流量计对发泡剂流量的实际检测值,并根据流量设定值与检测值的差值控制变频抽料泵的转速,用于使得流量计的检测值与流量设定值一致。本发明通过设置单独的流量控制模块对发泡剂流量进行控制,并对独立对发泡剂流量进行检测和控制,有效的缩短了流量检测控制周期,解决了现有流量检测控制周期较长,影响发泡质量的问题。(The invention discloses a sectional control system and a sectional control method for foaming injection flow, and relates to the technical field of refrigerator foaming. The invention comprises a main control module and a flow control module; the flow control module is used for receiving a foaming agent flow set value sent by the main control module and an actual detection value of the flow meter on the foaming agent flow, and controlling the rotating speed of the variable-frequency material pumping pump according to a difference value of the flow set value and the detection value so as to enable the detection value of the flow meter to be consistent with the flow set value. According to the invention, the independent flow control module is arranged to control the flow of the foaming agent and detect and control the flow of the foaming agent independently, so that the flow detection control period is effectively shortened, and the problems that the existing flow detection control period is longer and the foaming quality is influenced are solved.)

1. A sectional control system for flow of foaming injection, comprising: the system comprises a main control module and a flow control module;

the flow control module is used for receiving a foaming agent flow set value sent by the main control module and an actual detection value of the flow meter on the foaming agent flow, and controlling the rotating speed of the variable-frequency material pumping pump according to the difference value of the flow set value and the detection value so as to enable the detection value of the flow meter to be consistent with the flow set value.

2. The segmented foam injection flow control system of claim 1 further comprising an injection submodule; the material injection sub-module is used for receiving a material injection signal of the main control module, controlling the material injection gun to start material injection, and feeding back a feedback signal of material injection completion to the main control module after the material injection is completed.

3. A method of segmented control of the flow of foaming injection as claimed in claim 1 or 2, characterized in that it comprises the following steps:

the method comprises the following steps: the main control module sends the flow set value of the foaming agent to the flow control module and executes the third step;

step two: the flow control module receives a foaming agent flow set value, compares an actual foaming agent detection value of the flow meter with the flow set value, and controls the rotating speed of the variable-frequency material pumping pump according to a difference value so as to enable the detection value of the flow meter to be consistent with the flow set value;

step three: the main control module controls the foaming equipment to be started and enables the part to be foamed and the die to be closed;

step four: the main control module controls the butt joint of the foaming gun head and the mold after mold closing, and starts the foaming action, and the method specifically comprises the following steps:

a. controlling the opening of a foaming gun head, and injecting a foaming agent into the mold;

b. after the material injection is finished, controlling the foaming gun head to close;

step five: after the material injection is finished, the main control module controls the foaming gun head to be separated from the mold;

step six: and the master control module controls the mold opening and returns to the third step.

4. The segmented control method for the flow of the foaming injection material according to claim 1, wherein the two steps are operated independently and are used for carrying out closed-loop control on the flow of the foaming agent in real time.

5. The segmented control method for the flow of the foaming injection material according to claim 1, wherein in the fourth step, the steps a and b are independently controlled by an injection material submodule.

Technical Field

The invention belongs to the technical field of refrigerator foaming, and particularly relates to a sectional type control system and a sectional type control method for foaming injection flow.

Background

The proportion control of the foaming agent of the prior box body foaming is realized by controlling the flow rate of the foaming agent, and the diameter of a pipeline, the density of each foaming agent and the proportion of each foaming agent are known values, so the set flow rate of each foaming agent can be obtained by calculation. Therefore, the ratio of each blowing agent can be controlled by controlling the flow rate.

For the existing black material injection, a variable-frequency material pumping pump is adopted to convey the black material from a black material tank to an injection gun head through a conveying pipeline, and an electronic flowmeter is connected behind the variable-frequency material pumping pump. The control system controls the variable-frequency pumping pump to work according to a theoretical rotating speed according to a set flow value, the electronic flowmeter monitors actual flow in real time, when the deviation between the actual flow and the set flow exceeds an allowable range, the electronic flowmeter feeds back the actual flow to the control system through an electric signal, the control system adjusts the rotating speed of the variable-frequency pumping pump so as to change the flow, the electronic flowmeter continues to monitor the flow, and the stable flow is finally achieved after multiple adjustments. The flow rate of the white material is controlled in the same way as the black material.

The existing foaming control system controls all equipment actions in the box body foaming process through a control module, all actions such as opening of a mold, entering of the box body into the mold, closing of the mold, movement of a material injection gun head to a material injection position, advancing of the gun head, material injection of the gun head, pushing of the gun head and the like are controlled in the same control program, monitoring of black material flow and the like is carried out, programming of the control program is about 10 thousands of steps, the state is monitored in real time through electronic scanning, electronic scanning is carried out from the first step to the last step of the control program, and the process is circulated, and scanning is carried out once for about 50 milliseconds.

The variable-frequency material pumping pump of the foaming agent is in a normally open state, but the flow set value and the actual detection value of the foaming agent are detected and controlled once every time the program scans once. The flow control and the injection amount of the black and white materials are long, and the execution period of the control program is long, so that the detection control period of the flow is long, and the final foaming quality is affected.

Disclosure of Invention

The invention aims to provide a sectional type control system and a control method for foaming injection flow, which control the flow of a foaming agent by arranging an independent flow control module, shorten the flow detection control period and solve the problems that the existing flow detection control period is longer and the foaming quality is influenced.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to a sectional control system and a control method for foaming injection flow, which comprises a main control module and a flow control module; the flow control module is used for receiving a foaming agent flow set value sent by the main control module and an actual detection value of the flow meter on the foaming agent flow, and controlling the rotating speed of the variable-frequency material pumping pump according to the difference value of the flow set value and the detection value so as to enable the detection value of the flow meter to be consistent with the flow set value.

Further, the device also comprises an injection sub-module; the material injection sub-module is used for receiving a material injection signal of the main control module, controlling the material injection gun to start material injection, and feeding back a feedback signal of material injection completion to the main control module after the material injection is completed.

A sectional control method for foaming injection flow comprises the following steps:

the method comprises the following steps: the main control module sends the flow set value of the foaming agent to the flow control module and executes the third step;

step two: the flow control module receives a foaming agent flow set value, compares an actual foaming agent detection value of the flow meter with the flow set value, and controls the rotating speed of the variable-frequency material pumping pump according to a difference value so as to enable the detection value of the flow meter to be consistent with the flow set value;

step three: the main control module controls the foaming equipment to be started and enables the part to be foamed and the die to be closed;

step four: the main control module controls the butt joint of the foaming gun head and the mold after mold closing, and starts the foaming action, and the method specifically comprises the following steps:

a. controlling the opening of a foaming gun head, and injecting a foaming agent into the mold;

b. after the material injection is finished, controlling the foaming gun head to close;

step five: after the material injection is finished, the main control module controls the foaming gun head to be separated from the mold;

step six: and the master control module controls the mold opening and returns to the third step.

And further, the second step is independently operated and used for carrying out closed-loop control on the flow of the foaming agent in real time.

Further, in the fourth step, the steps a and b are independently controlled by the material injection submodule.

The invention has the following beneficial effects:

according to the invention, the independent flow control module is arranged to detect and control the flow of the foaming agent, so that the flow detection control period is shortened, the control precision of the flow of the foaming agent is effectively improved, the injection amount of each foaming agent is accurately controlled, and the overall foaming quality is ensured.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of a sectional type control system for the flow rate of foaming material according to the present invention;

FIG. 2 is a flow chart of a sectional control method for the flow of foaming material.

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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.

Example one

Referring to fig. 1, the present invention is a sectional control system for foaming injection flow, including a main control module and a flow control module, where the flow control module is configured to receive a foaming agent flow set value sent by the main control module and an actual detection value of a flow meter for a foaming agent flow, and control a rotation speed of a variable frequency material pump according to a difference between the flow set value and the detection value, so as to make the detection value of the flow meter consistent with the flow set value.

Specifically, the flow meter detects the flow of the foaming agent in real time and feeds an actual detection value back to the flow control module, the flow control module compares the actual detection value of the flow with a flow set value, if the actual detection value is smaller than the flow set value, the flow control module controls the rotation speed of the variable-frequency pumping pump to be increased, and the flow meter detects and feeds back the flow of the foaming agent in real time to realize closed-loop control of the flow of the foaming agent. And the flow control module operates independently, so that the detection control period of the flow of the foaming agent is effectively shortened, and the control precision of the foaming agent is improved.

Example two

On the basis of the first embodiment, the device also comprises a material injection sub-module; the material injection sub-module is used for receiving a material injection signal of the main control module, controlling the material injection gun to open the material injection, and feeding back a feedback signal of the material injection completion to the main control module after the material injection is completed. The material injection submodule realizes independent control of opening and closing of the material injection gun according to set parameters of foaming material injection, such as material injection time after the material injection gun is opened, and the like, so that the control precision of the material injection quantity is improved.

As shown in fig. 2, a sectional control method for the flow rate of foaming injection comprises the following steps:

the method comprises the following steps: after the foaming program is started and operated, the main control module firstly sends the flow set value of the foaming agent to the flow control module, and executes the third step.

Step two: and the flow control module receives a foaming agent flow set value, compares an actual foaming agent detection value of the flow meter with the flow set value, controls the rotating speed of the variable-frequency material pumping pump according to the difference value, and continuously detects the actual foaming agent flow in real time through the flow meter, so that the closed-loop control of the foaming agent is realized, and the detection value of the flow meter is consistent with the flow set value. The flow rate setting value may be a specific value or a range.

And the second step runs independently, and is always in an open state when the main control module executes other steps, so that the flow of the foaming agent is controlled in a closed loop manner in real time.

Step three: the main control module controls the foaming equipment to be started, so that the part to be foamed and the die are assembled. The part to be foamed is a refrigerator body or a refrigerator door body.

Step four: the main control module controls the butt joint of the foaming gun head and the mold after mold closing, and starts the foaming action, and the method specifically comprises the following steps: the master control module sends the signal of starting foaming to annotating the material submodule piece, annotates the material submodule piece independent control foaming rifle and annotate the material action and include:

a. controlling the opening of a foaming gun head, and injecting a foaming agent into the mold;

b. after the material injection is finished, controlling the foaming gun head to close;

and after the material injection is finished, the material injection sub-module feeds back a foaming finished signal to the main control module.

Step five: and after the main control module receives a feedback signal of material injection completion of the material injection submodule, the main control module controls the foaming equipment to act, so that the foaming gun head is separated from the mould.

Step six: and the master control module controls the mold opening and returns to the step three to carry out the foaming of the next part to be foamed.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.