A method for controlling the supply pressure

Abstract

The present application relates to the field of dispensing, and provides a supply pressure control method, comprising: S1, calibrating the relationship between the flow channel pressure change value and the supply air pressure change value; S2, setting an initial pressure parameter and determining a flow channel pressure value threshold range; S3, obtaining a flow channel pressure real-time value, and judging whether flow channel pressure compensation is needed according to the flow channel pressure value threshold range; S4, if flow channel pressure compensation is not needed, executing a dispensing task; if flow channel pressure compensation is needed, adjusting the supply air pressure value according to the calibration relationship between the flow channel pressure change value and the supply air pressure change value, realizing flow channel pressure compensation, and returning to step S3; the present application can automatically adjust the supply air pressure, ensure the stability of the glue output, and ensure the dispensing effect without occupying additional stable time.

Description

Technical Field

[0001] This invention relates to the field of dispensing, and more specifically, to a method for controlling the pressure of material supply. Background Technology

[0002] With the development of technology, dispensing control systems need continuous iteration to improve accuracy and stability, in order to meet the increasingly stringent requirements of various industries for dispensing processes. In the dispensing process, the viscosity of some adhesives changes over time during use. When using a syringe for dispensing, under constant supply air pressure, changes in adhesive viscosity lead to pressure changes in the flow channel. As the remaining adhesive gradually decreases, its weight decreases, also causing pressure changes in the flow channel. These pressure changes result in variations in the amount of adhesive dispensed from the valve. Therefore, a pressure-stabilizing control system is needed to stabilize the dispensing volume. Currently, products used in the industry to stabilize dispensing volume control change the dispensing time per cycle. However, in practical applications, the dispensing time is controlled by a host computer. Changing the dispensing time requires careful matching with motion control, dispensing trajectory, and other factors, making debugging very difficult and impractical for frequent adjustments. Therefore, changing the dispensing time per cycle has significant limitations in process applications. Summary of the Invention

[0003] The problem solved by this invention is how to provide a feeding pressure stabilization control method that can automatically adjust the feeding air pressure to stabilize the dispensing volume during dispensing operations.

[0004] To solve the above problems, the present invention provides a feeding pressure stabilization control method, comprising:

[0005] S1. Calibrate the relationship between the change value of flow channel pressure and the change value of feed air pressure;

[0006] S2. Set the initial pressure parameters and determine the threshold range of the flow channel pressure value;

[0007] S3. Obtain the real-time value of the flow channel pressure, calculate the change value of the flow channel pressure, and determine whether flow channel pressure compensation is required.

[0008] S4. If flow channel pressure compensation is not required, execute the dispensing task; if flow channel pressure compensation is required, adjust the supply air pressure value according to the calibration relationship between the flow channel pressure change value and the supply air pressure change value to achieve flow channel pressure compensation, and return to execute step S3.

[0009] Furthermore, the calibration of the relationship between the flow channel pressure change value and the feed air pressure change value includes:

[0010] S11. Change the feeding air pressure once, obtain and record the change value of the feeding air pressure, obtain the real-time feedback value of the flow channel pressure, and calculate the change value of the flow channel pressure.

[0011] S12. Repeat step S11 to obtain n sets of feed air pressure change values ​​and n sets of flow channel pressure change values;

[0012] S13. By using n sets of feed air pressure change values ​​and n sets of flow channel pressure change values, obtain the regression equations for the feed air pressure change values ​​and flow channel pressure change values, and calibrate the relationship between the flow channel pressure change values ​​and the feed air pressure change values.

[0013] Furthermore, the regression equation for obtaining the changes in feed air pressure and flow channel pressure includes:

[0014] By performing a least squares regression fitting on n sets of feed air pressure variation values ​​and n sets of flow channel pressure variation values, the function is obtained:

[0015] Δq=f(Δp)=a1(Δp)+a2(Δp)+a3(Δp)+…+am(Δp);

[0016] The regression equation for the change in feed air pressure Δq and the change in channel pressure Δp is:

[0017] Δq=a1Δp3+a2Δp2+a3Δp+a4;

[0018] Where a1, a2, a3, a4 and am are constants, Δq is the change in feed air pressure, and Δp is the change in flow channel pressure.

[0019] Furthermore, the initial pressure parameters include the initial feed air pressure value, the initial flow channel pressure value, and the allowable value of the flow channel pressure variation value.

[0020] Furthermore, the step of acquiring real-time flow channel pressure values ​​and determining whether flow channel pressure compensation is needed based on a flow channel pressure value threshold range includes:

[0021] Obtain the real-time flow channel pressure value P1. Let the flow channel pressure value P0 be when the dispensing process meets the requirements. The allowable value of the flow channel pressure change value is Δp0. Then the flow channel pressure change value Δp1 = |P1-P0|. When Δp1>Δp0, flow channel pressure compensation is required.

[0022] Furthermore, adjusting the feeding air pressure value based on the calibration relationship between the flow channel pressure change value and the feeding air pressure change value to achieve flow channel pressure compensation includes:

[0023] The calibration is based on the relationship between the change value of the flow channel pressure and the change value of the feed air pressure. The required change value of the feed air pressure is determined by the change value of the flow channel pressure, and the feed air pressure is adjusted to change the feed air pressure to achieve the required change value of the feed air pressure.

[0024] The present invention also provides a feeding voltage stabilization control for executing the feeding voltage stabilization control method described above, comprising:

[0025] Solenoid valves are used to control the on / off state of the gas supply circuit;

[0026] An electric proportional valve is used to adjust the feed air pressure;

[0027] The gas storage tank, controlled by an electro-proportional valve, achieves the corresponding positive pressure output;

[0028] A flow channel pressure sensor is used to detect the pressure value inside the flow channel cavity and obtain the flow channel pressure value.

[0029] A positive pressure sensor is used to detect the positive pressure value output by the gas storage tank and obtain the feeding gas pressure value;

[0030] The control unit receives the flow channel pressure value and the feed air pressure value signal, performs calculations, and outputs logic control signals to the electro-proportional valve.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] This patent stabilizes the flow channel pressure by automatically adjusting the supply air pressure during dispensing operations, thereby ensuring a stable dispensing effect. By calibrating the relationship between flow channel pressure changes and supply air pressure changes, the supply air pressure change can be directly calculated based on the flow channel pressure change. This allows for direct adjustment of the electro-proportional valve to output the corresponding supply air pressure. In actual dispensing, the control unit can adjust quickly without spending excessive time repeatedly adjusting the supply air pressure, ensuring a consistent dispensing effect without requiring additional time for stabilizing the air pressure, resulting in a more stable dispensing performance. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall process of the material supply and pressure stabilization control method according to an embodiment of the present invention;

[0034] Figure 2 A graph showing the effect of adhesive output in an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the overall structure of the material supply and pressure stabilization control system according to an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1-Control unit; 2-Solenoid valve; 3-Electrical proportional valve; 4-Air tank; 5-Positive pressure sensor; 6-Glue syringe; 7-Dispensing valve; 8-Dispensing valve flow channel; 9-Flow channel pressure sensor. Detailed Implementation

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] In the description of this specification, references to terms such as "embodiment," "one embodiment," and "one implementation" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or illustrative implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0041] like Figure 1 As shown, the present invention provides a feeding pressure stabilization control method, comprising:

[0042] S1. Calibrate the relationship between the change value of flow channel pressure and the change value of feed air pressure;

[0043] S2. Set the initial pressure parameters and determine the threshold range of the flow channel pressure value;

[0044] S3. Obtain the real-time value of the flow channel pressure and determine whether flow channel pressure compensation is needed based on the threshold range of the flow channel pressure value.

[0045] S4. If flow channel pressure compensation is not required, execute the dispensing task; if flow channel pressure compensation is required, adjust the supply air pressure value according to the calibration relationship between the flow channel pressure change value and the supply air pressure change value to achieve flow channel pressure compensation, and return to execute step S3.

[0046] It should be noted that the initial pressure parameters include the initial supply air pressure, the initial flow channel pressure, and the allowable values ​​for flow channel pressure variations. The flow channel pressure is stabilized by automatically adjusting the supply air pressure during the dispensing operation, thereby stabilizing the dispensing effect and achieving stable dispensing volume. The dispensing volume effect can be referenced... Figure 2 ,Depend on Figure 2 It can be seen that without material supply and pressure stabilization control, the amount of glue dispensed fluctuates significantly and gradually decreases with the dispensing time, while the amount of glue dispensed per batch with material supply and pressure stabilization control fluctuates less and remains basically stable.

[0047] Specifically, firstly, adjust the parameters according to the specific dispensing process requirements, setting the syringe supply air pressure to Q0, and reading the channel pressure value P0 when the dispensing process meets the requirements. The allowable channel pressure variation value without affecting the dispensing effect is Δp0, that is, the channel pressure threshold value for meeting the dispensing effect is [P0-Δp0, P0+Δp0]. When the channel pressure value does not exceed this range, no pressure compensation is performed; when the channel pressure value exceeds this range, pressure compensation is performed to bring the channel pressure back to the threshold range.

[0048] The control unit can obtain the current channel pressure value P1 in real time, and the channel pressure change value Δp1 = |P1 - P0|. When Δp1 > Δp0, channel pressure compensation is required. The compensation method is to adjust the syringe feed air pressure value through an electro-proportional valve, thereby adjusting the channel pressure. The adjusted feed air pressure value is Q1, and the feed air pressure change value is Δq1 = |Q1 - Q0|. Finally, the channel pressure value is compensated to the channel pressure threshold range.

[0049] To achieve accurate control, this invention also requires prior calibration of the relationship between the channel pressure change value and the feed air pressure change value, including:

[0050] S11. Change the feeding air pressure once, obtain and record the change value of the feeding air pressure, obtain the real-time feedback value of the flow channel pressure, and calculate the change value of the flow channel pressure.

[0051] S12. Repeat step S11 to obtain n sets of feed air pressure change values ​​and n sets of flow channel pressure change values;

[0052] S13. By using n sets of feed air pressure change values ​​and n sets of flow channel pressure change values, obtain the regression equations for the feed air pressure change values ​​and flow channel pressure change values, and calibrate the relationship between the flow channel pressure change values ​​and the feed air pressure change values.

[0053] The specific principle is illustrated below: Read the flow channel pressure value P0 and the syringe supply air pressure value Q0 when the dispensing process meets the requirements. First, change the supply air pressure via an electro-proportional valve, recording the change Δq1. Calculate the flow channel pressure change Δp1 using the real-time feedback value of the flow channel pressure. Second, change the supply air pressure via the electro-proportional valve, recording the change Δq2. Calculate the flow channel pressure change Δp2 using the real-time feedback value of the flow channel pressure. Third, change the supply air pressure via the electro-proportional valve, recording the change Δq3. Calculate the flow channel pressure change Δp3 using the real-time feedback value of the flow channel pressure… and so on. This process yields n sets of supply air pressure change values ​​Δq and n sets of flow channel pressure change values ​​Δp. Then, perform a least squares regression fitting on the two sets of values ​​to obtain the function:

[0054] Δq=f(Δp)=a1(Δp)+a2(Δp)+a3(Δp)+……+am(Δp)

[0055] Assume the regression equation between the obtained feed air pressure change value Δq and the flow channel pressure change value Δp is as follows:

[0056] Δq=a1Δp3+a2Δp2+a3Δp+a4

[0057] Where a1, a2, a3, and a4 are constants. In this way, the change in feed air pressure Δq can be accurately correlated with the change in flow channel pressure Δp. When the flow channel pressure value changes relative to the reference value in real time, the control unit can calculate the change in feed air pressure Δq based on the change in flow channel pressure Δp, and then directly adjust the electro-proportional valve to adjust the feed air pressure and ensure the stability of the flow channel pressure.

[0058] By calibrating the relationship between the flow channel pressure change value and the material supply air pressure change value, the material supply air pressure change value is calculated based on the flow channel pressure change value. The electric proportional valve is then directly adjusted, allowing the control unit to be quickly adjusted during actual dispensing without spending too much time repeatedly adjusting the material supply air pressure. This ensures the dispensing effect without taking up extra stabilization time.

[0059] The present invention also provides a feeding and pressure stabilizing control system for executing the feeding and pressure stabilizing control method described above, such as... Figure 3 As shown, it includes:

[0060] Solenoid valve 2 is used to control the on / off state of the air supply circuit;

[0061] Electric proportional valve 3 is used to adjust the feeding air pressure;

[0062] The gas storage tank 4, controlled by the electro-proportional valve 3, achieves the corresponding positive pressure output;

[0063] The flow channel pressure sensor 9 is used to detect the pressure value inside the flow channel cavity and obtain the flow channel pressure value.

[0064] Positive pressure sensor 5 is used to detect the positive pressure value output by air storage tank 4 and obtain the feeding air pressure value;

[0065] Control unit 1 receives the flow channel pressure value and the feeding air pressure value signal, performs calculations, and outputs a logic control signal to the electro-proportional valve 3.

[0066] It should be noted that the control unit 1 can work independently or be connected to a host computer for collaborative work. The air source enters the dispensing air supply circuit through the solenoid valve 2. The electro-proportional valve 3 is located at the air tank 4 and is used to adjust the positive pressure output of the air tank 4 according to the signal from the control unit 1. The positive pressure sensor 5 detects the output positive pressure value and transmits it back to the control unit 1. The positive pressure output of the air tank 4 enters the glue syringe 6. Under pressure, the glue syringe 6 supplies material to the dispensing valve 7 through the dispensing valve channel 8 to perform the dispensing task. The channel pressure sensor 9 detects the pressure value in the cavity of the dispensing valve channel 8 and transmits it back to the control unit 1. When the channel pressure value exceeds the channel pressure value threshold range, the control unit 1 calculates the change value of the supply air pressure based on the change value of the channel pressure value, thereby directly adjusting the electro-proportional valve 3 to adjust the supply air pressure, ensuring the stability of the channel pressure, which has a significant effect on improving the performance of the dispensing machine.

[0067] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A method for controlling the pressure stabilization of material supply, characterized in that, include: S1. Calibrate the relationship between the change value of flow channel pressure and the change value of feed air pressure; S2. Set the initial pressure parameters and determine the threshold range of the flow channel pressure value; S3. Obtain the real-time value of the flow channel pressure, calculate the change value of the flow channel pressure, and determine whether flow channel pressure compensation is required. S4. If channel pressure compensation is not required, execute the dispensing task; if channel pressure compensation is required, adjust the supply air pressure value according to the calibration relationship between the channel pressure change value and the supply air pressure change value to achieve channel pressure compensation, and return to execute step S3. The calibration of the relationship between the flow channel pressure change value and the feed air pressure change value includes: S11. Change the feeding air pressure once, obtain and record the change value of the feeding air pressure, obtain the real-time feedback value of the flow channel pressure, and calculate the change value of the flow channel pressure. S12. Repeat step S11 to obtain n sets of feed air pressure change values ​​and n sets of flow channel pressure change values; S13. By using n sets of feed air pressure change values ​​and n sets of flow channel pressure change values, obtain the regression equations for the feed air pressure change values ​​and the flow channel pressure change values, and realize the calibration of the relationship between the flow channel pressure change values ​​and the feed air pressure change values. The regression equations for obtaining the changes in feed air pressure and flow channel pressure include: By performing a least squares regression fitting on n sets of feed air pressure variation values ​​and n sets of flow channel pressure variation values, the function is obtained: Δq=f(Δp)=a1(Δp)+ a2(Δp)+ a3(Δp)+……+am(Δp); The regression equation for the change in feed air pressure Δq and the change in channel pressure Δp is: Δq= a1Δp3+ a2Δp2+ a3Δp+a4; Where a1, a2, a3, a4 and am are constants, Δq is the change in feed air pressure, and Δp is the change in flow channel pressure; The initial pressure parameters include the initial feed air pressure, the initial flow channel pressure, and the allowable value of the flow channel pressure variation.

2. The feeding and pressure stabilization control method according to claim 1, characterized in that, The steps of acquiring real-time flow channel pressure values, calculating flow channel pressure changes, and determining whether flow channel pressure compensation is needed include: Obtain the real-time flow channel pressure value P1. Let the flow channel pressure value P0 be when the dispensing process meets the requirements. The allowable value of the flow channel pressure change value is Δp0. Then the flow channel pressure change value Δp1 = |P1 - P0|. When Δp1 > Δp0, flow channel pressure compensation is required.

3. The feeding and pressure stabilization control method according to claim 2, characterized in that, The step of adjusting the feeding air pressure value based on the calibration relationship between the flow channel pressure change value and the feeding air pressure change value to achieve flow channel pressure compensation includes: The calibration is based on the relationship between the change value of the flow channel pressure and the change value of the feed air pressure. The required change value of the feed air pressure is determined by the change value of the flow channel pressure, and the feed air pressure is adjusted to change the feed air pressure to achieve the required change value of the feed air pressure.

4. A material feeding and pressure stabilization control system, used to execute the material feeding and pressure stabilization control method according to any one of claims 1-3, characterized in that, include: Solenoid valve (2) is used to control the on / off state of the gas supply circuit; Electric proportional valve (3) is used to adjust the feeding air pressure; The gas storage tank (4) is controlled by the electric proportional valve (3) to achieve the corresponding positive pressure output; The flow channel pressure sensor (9) is used to detect the pressure value inside the flow channel cavity and obtain the flow channel pressure value; A positive pressure sensor (5) is used to detect the positive pressure value output by the gas storage tank (4) and obtain the feeding gas pressure value; The control unit (1) receives the flow channel pressure value and the feed air pressure value signal, performs calculations, and outputs a logic control signal to the electric proportional valve (3).

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