Ink delivery valve on / off control method

Abstract

This invention belongs to the field of valve technology, specifically relating to an on / off control method for an ink delivery valve. The method includes: acquiring viscosity and density data of the medium; acquiring pressure threshold data of the on / off diaphragm; acquiring opening degree data of the on / off diaphragm; and controlling the descent of the on / off diaphragm at different speeds based on the acquired data to prevent the backlash force on the diaphragm from exceeding the threshold. This method controls the descent of the on / off diaphragm at different speeds based on the opening degree data when the valve is closed, and adjusts the descent speed at each stage to prevent the backlash force on the diaphragm from exceeding the threshold.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, specifically relating to lift valves, and more particularly to an on / off control method for an ink delivery valve. Background Technology

[0002] As a primary raw material in packaging printing, ink is used for color mixing. Current ink mixing methods typically involve precisely proportioning multiple colored inks to create the desired mixed ink color. These inks are generally transported from their respective storage tanks to a mixing tank for mixing. This process requires pipes and valves, with valves controlling the flow of the pipes and thus the start and stop of the ink delivery.

[0003] Because the amount of ink used needs to be precisely controlled during mixing to ensure accurate color, related technologies use electric regulating valves as on / off control valves. The electric regulating valve includes a fixed valve seat and a diaphragm valve core. The opening and closing of the valve is achieved by controlling the up and down displacement of the diaphragm valve core through an electric push rod. Furthermore, the use of a diaphragm as the valve core allows for the adjustment of micro-flow rates.

[0004] However, because the ink has a certain viscosity, the diaphragm will be subjected to a momentary backlash when the valve is closed. Over time, this can easily cause slight deformation of the diaphragm, leading to flow regulation failure.

[0005] Therefore, how to reduce the reverse impact force on the diaphragm when the valve is closed is a problem that urgently needs to be solved by those skilled in the art.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0007] This disclosure provides at least one method for controlling the on / off state of an ink delivery valve.

[0008] In a first aspect, embodiments of this disclosure provide an on / off control method for an ink delivery valve, comprising: acquiring viscosity data and density data of a medium; acquiring pressure threshold data of an on / off diaphragm; acquiring opening data of the on / off diaphragm; and controlling the on / off diaphragm to descend in stages according to the acquired data to prevent the backlash force on the on / off diaphragm from exceeding the threshold.

[0009] In one optional embodiment, the method for obtaining the opening degree data of the through / off diaphragm includes: setting the flow area formula of the medium as: Where A n The flow area of ​​the medium, in meters. 2 Q represents the flow rate of the medium, in cubic meters per second (m³). 3 / s, obtained by a flow sensor installed inside the flow channel; C is the flow coefficient of the diaphragm; ΔP is the pressure difference before and after the diaphragm is turned on and off, in Pa, which is collected by a pair of pressure sensors installed inside the flow channel and calculated by the control module; ρ is the density of the medium, in kg / m³. 3 .

[0010] In an optional embodiment, the method for obtaining the opening degree data of the on / off diaphragm further includes: setting the opening degree formula of the on / off diaphragm as: Where ε represents the opening degree of the on / off diaphragm; A max The maximum flow area of ​​the medium, in meters. 2 .

[0011] In one optional implementation, the method of controlling the graded speed descent of the on / off diaphragm based on the acquired data to prevent the recoil force on the on / off diaphragm from exceeding a threshold includes: classifying the descent path of the on / off diaphragm according to the opening data of the on / off diaphragm; and adjusting the descent speed of the on / off diaphragm at each grade to prevent the recoil force on the on / off diaphragm from exceeding the threshold.

[0012] In one optional embodiment, the method for classifying the descent path of the on / off diaphragm based on the opening degree data of the on / off diaphragm includes: setting the formula for the number of classifications of the descent path as follows: Where n is the number of stages required for the switching diaphragm to descend.

[0013] In one optional embodiment, the method of adjusting the descent speed of the switching diaphragm at each stage to prevent the recoil force on the switching diaphragm from exceeding a threshold includes: setting the descent speed formula of the switching diaphragm as: Where V n ρ represents the descent velocity of the switching diaphragm, in m / s; F represents the threshold recoil force of the medium on the switching diaphragm, in kg·m / s². 2 β is an empirical constant, with units of s / m. 2 μ is the viscosity of the medium, measured in Pa·s, and is obtained by a viscosity sensor installed in the flow channel.

[0014] In one optional implementation, when n is 3, the switching on and off of the diaphragm is performed in three stages, that is, the switching on and off of the diaphragm is based on the current flow area A. n The corresponding descent speed V n The flow rate decreases, and the flow rate is determined based on the flow area A at ε = 0.8 and 0.5 respectively. n Speed ​​adjustment is performed; when n is 2, the diaphragm is switched on and off for secondary speed adjustment, that is, the diaphragm is switched on and off according to the current flow area A. n The corresponding descent speed V n The flow rate decreases, and at ε = 0.5, the flow area A is considered. nSpeed ​​adjustment is performed; when n is 1, the diaphragm is switched on and off to perform first-level speed adjustment, that is, the diaphragm is switched on and off according to the current flow area A. n The corresponding descent speed V n To descend.

[0015] Secondly, embodiments of this disclosure also provide an ink delivery valve, comprising: a valve body having a flow channel therein; an on / off diaphragm disposed within the valve body; a screw having its lower end connected to the on / off diaphragm; a servo motor connected to the upper end of the screw; and a control module configured to adjust the descent speed of the on / off diaphragm in stages by controlling the servo motor to prevent the recoil force on the on / off diaphragm from exceeding a threshold.

[0016] Thirdly, embodiments of this disclosure also provide a computer-readable storage medium storing a computer program / instructions thereon, which, when executed by a processor, implements the steps of the on / off control method for the ink delivery valve as described above.

[0017] Fourthly, embodiments of this disclosure also provide a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of the on / off control method for the ink delivery valve as described above.

[0018] The beneficial effect of this invention is that the on / off control method of this ink delivery valve controls the on / off diaphragm to descend in stages according to the opening degree data of the on / off diaphragm when the valve is closed, and adjusts the descent speed of the on / off diaphragm at each stage to prevent the backlash force on the on / off diaphragm from exceeding the threshold.

[0019] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A flowchart illustrating an on / off control method for an ink delivery valve provided in this embodiment of the disclosure;

[0023] Figure 2 This is a cross-sectional view of an ink delivery valve provided in an embodiment of the present disclosure;

[0024] Figure 3 This is a schematic diagram of the flow area provided in an embodiment of the present disclosure.

[0025] In the picture:

[0026] Valve body 1, flow channel 11, on / off diaphragm 2, port 21, pressure sensor 22, screw 3, servo motor 4. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.

[0029] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] like Figure 1 Figure 2 As shown, at least one embodiment provides an on / off control method for an ink delivery valve, comprising: acquiring viscosity data and density data of the medium; acquiring pressure threshold data of the on / off diaphragm; acquiring opening data of the on / off diaphragm; and controlling the on / off diaphragm to descend in stages according to the acquired data to prevent the backlash force on the on / off diaphragm from exceeding the threshold.

[0031] In this embodiment, since the ink has a certain viscosity, the valve closing method with graded speed regulation can prevent the on / off diaphragm 2 from being subjected to a large impact force due to excessive speed when closing the valve at a large opening.

[0032] Specifically, since each batch of ink has different viscosity, and the amount of ink required for each mixing is not exactly the same, the opening degree of the on / off diaphragm 2 will vary. If the valve closing speed is adjusted only based on the opening degree of the on / off diaphragm 2, a large instantaneous impact force will occur in some cases where the opening degree of the on / off diaphragm 2 is small but the ink viscosity is high. To address this, this embodiment adopts a graded speed-adjusting valve closing method, which obtains the current ink viscosity and the opening degree of the on / off diaphragm 2 for comprehensive judgment, thereby increasing the valve closing speed while reducing the instantaneous impact force of the on / off diaphragm 2.

[0033] In some embodiments, the method for obtaining the opening degree data of the through / off diaphragm includes: setting the flow area formula of the medium as: Where A n The flow area of ​​the medium, in meters. 2 Q represents the flow rate of the medium, in cubic meters per second (m³). 3 / s, obtained by a flow sensor installed inside the flow channel; C is the flow coefficient of the diaphragm; ΔP is the pressure difference before and after the diaphragm is turned on and off, in Pa, which is collected by a pair of pressure sensors installed inside the flow channel and calculated by the control module; ρ is the density of the medium, in kg / m³. 3 .

[0034] In this embodiment, A n The flow area of ​​the medium changes as the on / off diaphragm 2 moves up and down. When the on / off diaphragm 2 gradually closes the valve, the flow area A of the medium... n It will gradually decrease; such as Figure 2 , Figure 3 As shown, in this embodiment, the ink passes through the flow channel 11 of the delivery valve, and a port 21 is formed in the middle of the flow channel 11. The ink needs to flow into the port 21. Therefore, the switching diaphragm 2 is disposed at the port 21, and the lower end of the switching diaphragm 2 is tapered. The area between the port 21 and the switching diaphragm 2, i.e., the flow area A, is changed by varying the length of the switching diaphragm 2 extending into the port 21. n .

[0035] In some embodiments, the control module is electrically connected to two pressure sensors 22, one pressure sensor 22 being located inside the pipe opening 21 and the other pressure sensor 22 being located outside the pipe opening 21.

[0036] In some embodiments, the method for obtaining the opening degree data of the on / off diaphragm further includes: setting the opening degree formula of the on / off diaphragm as: Where ε represents the opening degree of the on / off diaphragm; A max The maximum flow area of ​​the medium, in meters. 2 .

[0037] In this embodiment, Amax The medium flow area when the diaphragm 2 is not inserted into the pipe port 21 is measured; when the valve is closed, the medium flow area A can be obtained by collecting relevant data. n Subsequently through A n and A max The opening data ε of the on / off diaphragm 2 can be obtained by the ratio of the two values.

[0038] In some embodiments, a method for controlling the graded speed descent of the on / off diaphragm based on acquired data to prevent the recoil force on the on / off diaphragm from exceeding a threshold includes: grading the descent path of the on / off diaphragm according to the opening data of the on / off diaphragm; and adjusting the descent speed of the on / off diaphragm at each grade to prevent the recoil force on the on / off diaphragm from exceeding the threshold.

[0039] In this embodiment, when closing the valve, after obtaining the opening degree data ε of the on / off diaphragm 2, the valve closing path of the on / off diaphragm 2 can be graded according to the opening degree data ε, so that the on / off diaphragm 2 corresponds to a descent speed at each level, thereby avoiding the on / off diaphragm 2 being subjected to a large impact force due to excessive speed when closing the valve at a large opening.

[0040] In some embodiments, a method for classifying the descent path of a diaphragm based on the opening degree data of the diaphragm includes: setting the formula for the number of classifications of the descent path as follows: Where n is the number of stages required for the switching diaphragm to descend.

[0041] In this embodiment, the opening degree data ε ranges from 0 to 1, where 0 represents a fully closed valve and 1 represents a fully open valve. When ε is greater than 0.8, it indicates that the opening degree of the on / off diaphragm 2 is relatively large. When ε is less than or equal to 0.5, it indicates that the opening degree of the on / off diaphragm 2 is relatively small.

[0042] In some embodiments, the method of adjusting the descent speed of the switching diaphragm at each stage to prevent the recoil force on the switching diaphragm from exceeding a threshold includes: setting the descent speed formula of the switching diaphragm as: Where V n ρ represents the descent velocity of the switching diaphragm, in m / s; F represents the threshold recoil force of the medium on the switching diaphragm, in kg·m / s². 2 β is an empirical constant for viscosity and impact force, with units of s / m. 2 μ is the viscosity of the medium, measured in Pa·s, and is obtained by a viscosity sensor installed in the flow channel.

[0043] In this embodiment, each type of on / off diaphragm 2 has a recoil force threshold. As long as the recoil force received is not higher than this threshold, the on / off diaphragm 2 will not be damaged.

[0044] In some embodiments, when n is 3, the diaphragm is switched on and off at the current flow area A. nThe corresponding descent speed V n The flow rate decreases, and the flow rate is determined based on the flow area A at ε = 0.8 and 0.5 respectively. n Adjust the speed.

[0045] In this embodiment, when ε is greater than 0.8, it indicates that the opening degree of the on / off diaphragm 2 is relatively large. At this time, the on / off diaphragm 2 is adjusted in three stages. The first stage of speed adjustment is based on the flow area A of the on / off diaphragm 2 when the valve is not closed. n Calculations are performed; as the opening and closing diaphragm 2 decreases, ε gradually decreases. When ε decreases to 0.8, the flow area A of the opening and closing diaphragm 2 at this point is calculated. n The descent speed is calculated again, which is the second level of speed regulation. As the switching diaphragm 2 continues to descend, when ε decreases to 0.5, the descent speed is calculated again, which is the third level of speed regulation.

[0046] In some embodiments, when n is 2, the diaphragm is switched on and off at the current flow area A. n The corresponding descent speed V n The flow rate decreases, and at ε = 0.5, the flow area A is considered. n Adjust the speed.

[0047] In some embodiments, when n is 1, the diaphragm is switched on and off at the current flow area A. n The corresponding descent speed V n To descend.

[0048] In this embodiment, when ε is less than or equal to 0.5, it indicates that the opening degree of the on / off diaphragm 2 is small. At this time, the on / off diaphragm 2 only needs one level of speed regulation, that is, based on the flow area A of the on / off diaphragm 2 when there is no closed valve. n Calculate the descent speed and close the valve at that speed.

[0049] like Figure 2 As shown, at least one embodiment also provides an ink delivery valve, including: a valve body 1 having a flow channel 11 therein; an on / off diaphragm 2 disposed within the valve body 1; a screw 3 having its lower end connected to the on / off diaphragm 2; a servo motor 4 connected to the upper end of the screw 3; and a control module configured to adjust the descent speed of the on / off diaphragm 2 in stages by controlling the servo motor 4 to prevent the recoil force on the on / off diaphragm 2 from exceeding a threshold.

[0050] At least one embodiment also provides a computer-readable storage medium having a computer program / instructions stored thereon, which, when executed by a processor, implements the steps of an on / off control method for an ink delivery valve.

[0051] At least one embodiment also provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of an on / off control method for an ink delivery valve.

[0052] In summary, the on / off control method of this ink delivery valve controls the on / off diaphragm 2 to descend in stages according to the opening data of the on / off diaphragm 2 when the valve is closed. That is, by adopting a staged speed regulation valve closing method, the on / off diaphragm 2 will not be subjected to a large impact force due to excessive speed when the valve is closed at a large opening.

[0053] In this document, when it is said that the first component is located on the second component, this can mean that the first component can be directly formed on the second component, or that the third component can be inserted between the first component and the second component.

[0054] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0055] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0056] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0057] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0058] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0059] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0060] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0061] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0062] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A method for controlling the on / off state of an ink delivery valve, characterized in that, include: The ink delivery valve includes: Valve body (1), with a flow channel (11) inside; A switching diaphragm (2) is installed inside the valve body (1); The screw (3) is connected at its lower end to the through-and-off diaphragm (2); The servo motor (4) is connected to the upper end of the screw (3); The control module is configured to adjust the descent speed of the switching diaphragm (2) in stages by controlling the servo motor (4) to prevent the recoil force on the switching diaphragm (2) from exceeding the threshold. Obtain the viscosity and density data of the medium; Obtain the pressure threshold data of the on / off diaphragm; Obtain the opening degree data of the on / off diaphragm; The control system adjusts the speed of the switching diaphragm based on the acquired data to prevent the recoil force on the switching diaphragm from exceeding the threshold. The method for obtaining the opening degree data of the on / off diaphragm includes: The formula for the flow area of ​​the medium is: ;in A n The flow area of ​​the medium, in meters. 2 ; Q The flow rate of the medium, in meters (m³). 3 / s, obtained by a flow sensor installed inside the flow channel; C The flow coefficient of the on / off diaphragm; ΔP The pressure difference before and after the diaphragm is turned on and off is measured in Pa. It is collected by a pair of pressure sensors installed in the flow channel and then calculated by the control module. ρ The density of the medium is expressed in kg / m³. 3 ; The method for obtaining the opening degree data of the on / off diaphragm further includes: The formula for setting the opening degree of the switching diaphragm is as follows: ;in ε This refers to the opening degree data of the diaphragm. A max The maximum flow area of ​​the medium, in meters. 2 ; The method for controlling the graded speed descent of the switching diaphragm based on the acquired data to prevent the recoil force on the switching diaphragm from exceeding the threshold includes: The descent path of the switching diaphragm is classified according to the opening degree data of the switching diaphragm; Adjust the descent speed of the switching diaphragm at each stage to prevent the recoil force on the switching diaphragm from exceeding the threshold. The method for classifying the descent path of the on / off diaphragm based on the opening data of the on / off diaphragm includes: The formula for setting the number of steps in a descent path is: ; in, n The number of stages required for the diaphragm to descend; The method for adjusting the descent speed of the switching diaphragm at each stage to prevent the recoil force on the switching diaphragm from exceeding the threshold includes: The formula for the descent speed of the switching diaphragm is set as follows: ;in V n The descent speed of the switching diaphragm is expressed in m / s. F The threshold of recoil force of the medium on the switching diaphragm, expressed in kg·m / s². 2 ; β This is an empirical constant for viscosity and impact force, with units of s / m. 2 ; μ The viscosity of the medium is expressed in Pa·s and is obtained from a viscosity sensor installed inside the flow channel.

2. The on / off control method for the ink delivery valve as described in claim 1, characterized in that, when n The diaphragm is switched on and off at three different speeds, meaning the switching speed is adjusted based on the current flow area. A n Corresponding descent speed V n To descend, and respectively at ε When the value is 0.8 and 0.5, it depends on the circulation area. A n Adjust the speed; when n The diaphragm is switched on and off in two stages for secondary speed regulation, meaning the switching on and off of the diaphragm is based on the current flow area. A n Corresponding descent speed V n To descend, and in ε When it is 0.5, it depends on the circulation area. A n Adjust the speed; when n For step 1, the diaphragm is switched on and off at a speed of 1, meaning the switching on and off of the diaphragm is based on the current flow area. A n Corresponding descent speed V n To descend.

3. A computer-readable storage medium having a computer program / instructions stored thereon, characterized in that, When the computer program / instruction is executed by the processor, it implements the steps of the on / off control method for the ink delivery valve according to any one of claims 1-2.

4. A computer program product, comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the on / off control method for the ink delivery valve as described in any one of claims 1-2.

Images