On-off control method of printing ink conveying valve

Abstract

The invention belongs to the technical field of valves, and particularly relates to an on-off control method of a printing ink conveying valve, which comprises the following steps: acquiring viscosity data and density data of a medium; obtaining compression threshold value data of the on-off diaphragm; acquiring opening data of the on-off diaphragm; according to the acquired data, controlling the on-off diaphragm to descend in a grading speed regulation manner so as to prevent the recoil force borne by the on-off diaphragm from exceeding a threshold value; according to the on-off control method of the printing ink conveying valve, when the valve is closed, the on-off diaphragm is controlled to descend in a graded speed regulation mode according to the opening degree data of the on-off diaphragm, and the descending speed of the on-off diaphragm at each stage is adjusted so that the recoil force borne by the on-off diaphragm can be prevented from exceeding the threshold value.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, specifically relates to a lift valve, and particularly relates to a method for controlling the on-off of an ink conveying valve. Background Art

[0002] As the main raw material for packaging printing, ink is used for color mixing. The existing ink mixing methods usually mix a variety of colored inks through precise ratios to form the color of the required mixed ink. Generally, a variety of inks are transported from corresponding storage tanks to a mixing tank for mixing. During the process of transporting from the storage tank to the mixing tank, pipelines and valves are required, and the valves are used to control the on-off of the pipelines, thereby controlling the start and stop of ink transportation.

[0003] Since precise control of the dosage is required during ink mixing to ensure accurate color, in related technologies, an electric control valve is used as the on-off control valve. The electric control valve includes a fixed valve seat and a diaphragm spool. The up and down displacement of the diaphragm spool is controlled by an electric push rod to achieve the opening and closing of the valve, and a diaphragm is used as the spool to achieve the adjustment of micro flow.

[0004] However, due to the certain viscosity of the ink, when closing the valve, the diaphragm will be subjected to an instantaneous reaction force, which will easily cause minute deformation of the diaphragm over time, resulting in the failure of flow regulation.

[0005] Therefore, how to reduce the reverse impact force on the diaphragm when closing the valve is an urgent problem to be solved by those skilled in the art.

[0006] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of this application. Therefore, the above description is not considered as information of the prior art. Summary of the Invention

[0007] The embodiments of the present disclosure at least provide a method for controlling the on-off of an ink conveying valve.

[0008] In a first aspect, the embodiments of the present disclosure provide a method for controlling the on-off of an ink conveying valve, including: obtaining the viscosity data of the medium and the density data of the medium; obtaining the pressure threshold data of the on-off diaphragm; obtaining the opening data of the on-off diaphragm; and controlling the on-off diaphragm to decrease the speed in stages according to the obtained data to prevent the reaction force received by the on-off diaphragm from exceeding the threshold.

[0009] In an optional embodiment, the method for obtaining the opening data of the on-off diaphragm includes: setting the formula for the flow area of the medium as: where A n is the flow area of the medium, with the unit of m 2 ; Q is the flow rate of the medium, with the unit of m 3 / s, obtained by a flow sensor arranged in the flow channel; C is the flow coefficient of the on-off diaphragm; ΔP is the pressure difference before and after the on-off diaphragm, in Pa, obtained by collecting with a pair of pressure sensors arranged in the flow channel and calculated by the control module; ρ is the density of the medium, in kg / m 3 .

[0010] In an alternative embodiment, the method for obtaining the opening data of the on-off diaphragm further includes: setting the opening formula of the on-off diaphragm as: where ε is the opening data of the on-off diaphragm; A max is the maximum flow area of the medium, in m 2 .

[0011] In an alternative embodiment, the method for controlling the on-off diaphragm to decrease in speed in stages according to the acquired data to prevent the recoil force on the on-off diaphragm from exceeding the threshold includes: grading the descending path of the on-off diaphragm according to the opening data of the on-off diaphragm; adjusting the descending speed of the on-off diaphragm at each stage to prevent the recoil force on the on-off diaphragm from exceeding the threshold.

[0012] In an alternative embodiment, the method for grading the descending path of the on-off diaphragm according to the opening data of the on-off diaphragm includes: setting the formula for the number of grading times of the descending path as: where n is the number of levels required for the on-off diaphragm to descend.

[0013] In an alternative embodiment, the method for adjusting the descending speed of the on-off diaphragm at each stage to prevent the recoil force on the on-off diaphragm from exceeding the threshold includes: setting the descending speed formula of the on-off diaphragm as: where V n is the descending speed of the on-off diaphragm, in m / s; F is the recoil force threshold of the medium on the on-off diaphragm, in kg·m / s 2 ; β is an empirical constant, in s / m 2 ; μ is the viscosity of the medium, in Pa·s, obtained by a viscosity sensor arranged in the flow channel.

[0014] In an alternative embodiment, when n is 3, the on-off diaphragm performs three-stage speed regulation, that is, the on-off diaphragm descends at the descending speed V n corresponding to the current flow area A n , and adjusts the speed according to the flow area A n when ε is 0.8 and 0.5 respectively; when n is 2, the on-off diaphragm performs two-stage speed regulation, that is, the on-off diaphragm descends at the descending speed V n corresponding to the current flow area A n , and adjusts the speed according to the flow area A nAdjust the speed; when n is 1, the on-off diaphragm is used for primary speed adjustment, that is, the on-off diaphragm descends at the current flow area A n corresponding descending speed V n for descending.

[0015] In a second aspect, an embodiment of the present disclosure further provides an ink delivery valve, including: a valve body with a flow channel formed therein; an on-off diaphragm disposed within the valve body; a screw rod, the lower end of which is connected to the on-off diaphragm; a servo motor connected to the upper end of the screw rod; and a control module configured to prevent the backflush force received by the on-off diaphragm from exceeding a threshold by controlling the servo motor to hierarchically adjust the descending speed of the on-off diaphragm.

[0016] In a third aspect, an embodiment of the present disclosure further provides a computer-readable storage medium, on which a computer program / instructions are stored, and when the computer program / instructions are executed by a processor, the steps of the on-off control method of the ink delivery valve as described above are implemented.

[0017] In a fourth aspect, an embodiment of the present disclosure further provides a computer program product, including a computer program / instructions, and when the computer program / instructions are executed by a processor, the steps of the on-off control method of the ink delivery valve as described above are implemented.

[0018] The beneficial effect of the present invention is that the on-off control method of the present ink delivery valve controls the hierarchical speed adjustment and descent of the on-off diaphragm according to the opening data of the on-off diaphragm when closing the valve, and adjusts the descending speed of the on-off diaphragm at each level to prevent the backflush force received by the on-off diaphragm from exceeding the threshold.

[0019] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structures specifically pointed out in the specification and the drawings.

[0020] To make the above objectives, features, and advantages of the present invention more obvious and understandable, specific preferred embodiments are hereby exemplified and described in detail in conjunction with the accompanying drawings as follows. Description of the Drawings

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0022] Figure 1 It is a flowchart of an on-off control method of an ink delivery valve provided by an embodiment of the present disclosure;

[0023] Figure 2 Schematic cross-sectional structure diagram of an ink delivery valve provided by an embodiment of the present disclosure;

[0024] Figure 3 Schematic structure diagram of a flow area provided by an embodiment of the present disclosure.

[0025] In the figure:

[0026] Valve body 1, flow channel 11, on-off diaphragm 2, pipe orifice 21, pressure sensor 22, screw 3, servo motor 4. Specific implementation manners

[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. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, in the drawings, for the purpose of effectively describing the technical content, the thickness of components may be exaggerated or reduced.

[0029] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments may be combined with each other.

[0030] As Figure 1 Figure 2 shown, at least one embodiment provides a method for controlling the on-off of an ink delivery valve, including: obtaining the viscosity data of the medium and the density data of the medium; obtaining the pressure threshold data of the on-off diaphragm; obtaining the opening degree data of the on-off diaphragm; and controlling the on-off diaphragm to decrease in a stepwise speed regulation manner according to the obtained data to prevent the recoil force received by the on-off diaphragm from exceeding the threshold.

[0031] In this embodiment, since the ink has a certain viscosity, adopting a stepwise speed regulation closed valve method can prevent the on-off diaphragm 2 from receiving a large impact force due to too fast speed when closing the valve at a large opening degree.

[0032] Specifically, since there are viscosity differences in the ink for each batch, and the demand for the ink is not exactly the same each time when making the ratio, the opening degree of the on-off diaphragm 2 will be different. If only the method of adjusting the closing valve speed according to the opening degree of the on-off diaphragm 2 is adopted, it will cause a large instantaneous impact force in some cases where the opening degree of the on-off diaphragm 2 is small but the ink viscosity is large. Therefore, in this embodiment, by adopting a stepwise speed regulation closing valve method, the current viscosity of the ink and the opening degree of the on-off diaphragm 2 are respectively obtained for comprehensive determination, so as to improve the closing valve speed on the premise of 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 on-off diaphragm includes: setting the formula for the flow area of the medium as: where A n is the flow area of the medium, with the unit of m 2 ; Q is the flow rate of the medium, with the unit of m 3 / s, which is obtained by a flow sensor arranged in the flow channel; C is the flow coefficient of the on-off diaphragm; ΔP is the pressure difference before and after the on-off diaphragm, with the unit of Pa, which is collected by a pair of pressure sensors arranged in the flow channel and then calculated by the control module; ρ is the density of the medium, with the unit of kg / m 3 .

[0034] In this embodiment, A n is the flow area of the medium, and the flow area changes with the rise and fall of the on-off diaphragm 2. When the on-off diaphragm 2 gradually closes the valve, the flow area A n will gradually decrease; as Figure 2 , Figure 3 shown, in this embodiment, the ink will pass through the flow channel 11 of the conveying valve, and a pipe orifice 21 will be formed in the middle of the flow channel 11. The ink needs to flow into the pipe orifice 21. Therefore, the on-off diaphragm 2 is arranged at the pipe orifice 21, and the lower end of the on-off diaphragm 2 is conical. The area between the pipe orifice 21 and the on-off diaphragm 2, that is, the flow area A n , is changed by the different lengths of the on-off diaphragm 2 extending into the pipe orifice 21.

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

[0036] In some embodiments, the method for obtaining the opening degree data of the on-off diaphragm further includes: setting the formula for the opening degree of the on-off diaphragm as: where ε is the opening degree data of the on-off diaphragm; A max is the maximum flow area of the medium, with the unit of m 2 .

[0037] In this embodiment, Amax is the medium flow area when the on-off diaphragm 2 does not extend into the pipe orifice 21; when closing the valve, the flow area A of the medium at this time can be obtained by collecting corresponding data n , and then through A n and A max , the opening data ε of the on-off diaphragm 2 can be obtained through their ratio.

[0038] In some embodiments, the method for controlling the on-off diaphragm to decrease in speed in stages according to the acquired data to prevent the recoil force on the on-off diaphragm from exceeding the threshold includes: grading the descending path of the on-off diaphragm according to the opening data of the on-off diaphragm; adjusting the descending speed of the on-off diaphragm at each stage 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 data ε of the on-off diaphragm 2, the closing path of the on-off diaphragm 2 can be graded according to this opening data ε, so that the on-off diaphragm 2 corresponds to a descending speed at each stage, thereby avoiding the on-off diaphragm 2 from being subjected to a large impact force due to too fast a speed when closing the valve at a large opening.

[0040] In some embodiments, the method for grading the descending path of the on-off diaphragm according to the opening data of the on-off diaphragm includes: setting the formula for the number of grading times of the descending path as: where n is the number of levels required for the on-off diaphragm to descend.

[0041] In this embodiment, the range of the opening data ε is 0 - 1, where 0 represents fully closed valve and 1 represents fully open; when ε is greater than 0.8, it indicates that the opening of the on-off diaphragm 2 is relatively large at this time, and when ε is less than or equal to 0.5, it indicates that the opening of the on-off diaphragm 2 is relatively small at this time.

[0042] In some embodiments, the method for adjusting the descending speed of the on-off diaphragm at each stage to prevent the recoil force on the on-off diaphragm from exceeding the threshold includes: setting the formula for the descending speed of the on-off diaphragm as: where V n is the descending speed of the on-off diaphragm, with the unit of m / s; F is the recoil force threshold of the medium on the on-off diaphragm, with the unit of kg·m / s 2 ; β is the empirical constant of viscosity and impact force, with the unit of s / m 2 ; μ is the viscosity of the medium, with the unit of Pa·s, which is obtained by a viscosity sensor set 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 on-off diaphragm has the current flow area A nThe corresponding descending speed V n descends, and adjusts the speed according to the flow area A when ε is 0.8 and 0.5 respectively n for speed regulation.

[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 has three levels of speed regulation. The first level of speed regulation is based on the flow area A of the on-off diaphragm 2 when there is no valve closing n for calculation; as the on-off diaphragm 2 descends, ε gradually decreases. When ε decreases to 0.8, the descending speed is recalculated according to the flow area A of the on-off diaphragm 2 at this time n This is the second level of speed regulation; as the on-off diaphragm 2 continues to descend, when ε decreases to 0.5, the descending speed is recalculated again, and this is the third level of speed regulation.

[0046] In some embodiments, when n is 2, the on-off diaphragm descends at the corresponding descending speed V n corresponding to the current flow area A n and adjusts the speed according to the flow area A when ε is 0.5 n for speed regulation.

[0047] In some embodiments, when n is 1, the on-off diaphragm descends at the corresponding descending speed V n corresponding to the current flow area A n for descending.

[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 relatively small. At this time, the on-off diaphragm 2 only needs one level of speed regulation, that is, the descending speed is calculated based on the flow area A of the on-off diaphragm 2 when there is no valve closing n and the valve is closed at this descending speed.

[0049] As Figure 2 shown, at least one embodiment also provides an ink delivery valve, including: a valve body 1 with a flow channel 11 formed 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 prevent the recoil force on the on-off diaphragm 2 from exceeding a threshold by controlling the servo motor 4 to adjust the descending speed of the on-off diaphragm 2 in stages.

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

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

[0052] In summary, the on-off control method of this ink delivery valve controls the stepwise descent of the on-off diaphragm 2 according to the opening data of the on-off diaphragm 2 when closing the valve. That is, by adopting a stepwise speed regulation method for closing the valve, the on-off diaphragm 2 will not be subjected to a large impact force due to too fast speed when closing the valve at a large opening.

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

[0054] In this document, when an element or layer is referred to as being "located on", "joined to", "connected to", "attached to", or "coupled to" another element or layer, it can be directly located on, joined, connected, attached, or coupled to the other element or layer, or there can be intervening elements or layers. Conversely, when an element is referred to as being "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 intervening elements or layers. Other words used to describe the relationship 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 associated listed items.

[0055] In this document, example 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 modifying 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 terms used herein are only for describing specific exemplary configurations and are not intended to be limiting. As used herein, the singular articles "a", "an", and "the" may also be intended to include the plural forms, unless it is clearly stated otherwise in the context. The terms "comprising", "including", and "having" are inclusive and thus specify the presence of the specified 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 their combinations. The method steps, processes, and operations described herein should not be construed as necessarily requiring them to be performed in the particular order discussed or shown, unless specifically identified as an order of performance. Additional or alternative steps may be employed.

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

[0058] In the description of the embodiments of the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", and "coupled" shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 a limitation of the present invention. In addition, terms such as "first", "second", and other numerical terms used herein do not imply an order or sequence unless explicitly indicated herein. Thus, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or section discussed above can be referred to as the second element, component, region, layer, or section.

[0060] Spatially relative terms, such as "inner", "outer", "beneath", "below", "lower", "above", "upper", etc., may be used herein for ease of description to describe the relationship of one element or feature to another element or feature as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as "beneath" or "below" other elements or features will then be oriented "above" the other elements or features. Thus, the exemplary term "beneath" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein are to be interpreted accordingly.

[0061] In the above discussion, unless otherwise specified, when used to describe a numerical value, the terms "about", "approximately", "substantially", etc. mean a variation of + / − 10% of that value.

[0062] Inspired by the above-described ideal embodiments of the present invention, through the above description, relevant staff can, without departing from the technical idea of the present invention, make various changes and modifications. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for controlling the on-off of an ink delivery valve, characterized in that, Including: Obtaining the viscosity data of the medium and the density data of the medium; Obtaining the pressure threshold data of the on-off diaphragm; Obtaining the opening data of the on-off diaphragm; Controlling the on-off diaphragm to descend with graded speed regulation according to the obtained data to prevent the recoil force received by the on-off diaphragm from exceeding the threshold.

2. The on-off control method of the ink delivery valve according to claim 1, characterized in that The method for obtaining the opening data of the on-off diaphragm includes: The formula for setting the flow area of the medium is as follows: where A n is the flow area of the medium, with the unit of m 2 ; Q is the flow rate of the medium, with the unit of m 3 / s, which is obtained by a flow sensor arranged in the flow channel; C is the flow coefficient of the on-off diaphragm; ΔP is the pressure difference before and after the on-off diaphragm, with the unit of Pa, which is obtained by a pair of pressure sensors arranged in the flow channel and calculated by the control module; ρ is the density of the medium, with the unit of kg / m 3 .

3. The on-off control method of the ink delivery valve according to claim 2, characterized in that The method for obtaining the opening data of the on-off diaphragm further includes: Set the opening formula of the on-off diaphragm as follows: where ε is the opening data of the on-off diaphragm; A max is the maximum flow area of the medium, in m 2 .

4. The on-off control method of the ink delivery valve according to claim 3, characterized in that The method for controlling the on-off diaphragm to descend with graded speed regulation according to the obtained data to prevent the recoil force received by the on-off diaphragm from exceeding the threshold includes: Classifying the descending path of the on-off diaphragm according to the opening data of the on-off diaphragm; Adjusting the descending speed of the on-off diaphragm at each level to prevent the recoil force received by the on-off diaphragm from exceeding the threshold.

5. The on-off control method of the ink delivery valve according to claim 4, characterized in that The method for classifying the descending path of the on-off diaphragm according to the opening data of the on-off diaphragm includes: The formula for setting the number of grading times of the descent path is as follows: Wherein, n is the number of levels required for the on-off diaphragm to descend.

6. The on-off control method of the ink delivery valve according to claim 5, characterized in that The method for adjusting the descending speed of the on-off diaphragm at each level to prevent the recoil force received by the on-off diaphragm from exceeding the threshold includes: The formula for setting the descending speed of the on-off diaphragm is as follows: Where V n is the descending speed of the on-off diaphragm, with the unit of m / s; F is the recoil force threshold of the medium on the on-off diaphragm, with the unit of kg·m / s 2 ; β is an empirical constant of viscosity and impact force, with the unit of s / m 2 ; μ is the viscosity of the medium, with the unit of Pa·s, which is obtained by a viscosity sensor arranged in the flow channel.

7. The on-off control method of the ink delivery valve according to claim 6, characterized in that When n is 3, the on-off diaphragm performs three-level speed regulation, that is, the on-off diaphragm descends at the current flow area A n corresponding descending speed V n and descends, and speed regulation is performed according to the flow area A when ε is 0.8 and 0.5 respectively n ; When n is 2, the on-off diaphragm performs secondary speed regulation, that is, the on-off diaphragm descends at the current flow area A n corresponding descending speed V n and descends, and when ε is 0.5, speed regulation is performed according to the flow area A n ; When n is 1, the on-off diaphragm performs primary speed regulation, that is, the on-off diaphragm descends at the current flow area A n corresponding descending speed V n for descending.

8. An ink delivery valve, characterized in that, Including: A valve body (1) with a flow channel (11) opened therein; An on-off diaphragm (2) arranged in the valve body (1); A screw rod (3) whose lower end is connected to the on-off diaphragm (2); A servo motor (4) connected to the upper end of the screw rod (3); A control module configured to control the servo motor (4) to adjust the descending speed of the on-off diaphragm (2) in a graded manner to prevent the recoil force received by the on-off diaphragm (2) from exceeding the threshold.

9. A computer-readable storage medium having computer programs / instructions stored thereon, characterized in that, When the computer program / instructions are executed by a processor, the steps of the on-off control method of the ink delivery valve according to any one of claims 1-7 are implemented.

10. A computer program product, comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by a processor, the steps of the on-off control method of the ink delivery valve according to any one of claims 1-7 are implemented.

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