Falling ball type ink viscosity control device and control method thereof

Abstract

The invention discloses a falling ball type ink viscosity control device and a control method thereof, and belongs to the technical field of ink viscosity control. The overflow channel, the first channel and the second channel extend in the first direction, the liquid outlet channel and the discharging channel which extend up and down are arranged on the two sides of the overflow cavity located above the liquid inlet cavity in the first direction, the overflow channel communicates with the overflow cavity and the upper end of the liquid outlet channel, the first channel communicates with the overflow cavity and the upper end of the discharging channel, and a first piston piece is arranged in the first channel. The second channel is communicated with the liquid inlet cavity and the discharge channel, and a second piston piece is arranged in the second channel; the liquid inlet valve assembly controls opening and closing of a liquid inlet of the liquid inlet cavity. The measuring pipe is communicated with the liquid inlet cavity and the overflow cavity; the two electromagnet pieces magnetically drive the second piston piece to move to the first position or the second position so as to control connection and disconnection of the liquid inlet cavity and the discharging channel and magnetically drive the one-way valve at the lower end of the discharging channel to be opened when the liquid inlet cavity communicates with the discharging channel. The problems that the measuring tube is easy to damage due to a water hammer effect and the measuring ball is stuck due to ink impurities are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of ink viscosity control, and in particular relates to a falling ball type ink viscosity control device and a control method thereof. Background Art

[0002] Ink is a crucial raw material in the printing industry, and its viscosity is a crucial technical parameter for stable printing on printing equipment. Because inks are prone to volatilization and sedimentation due to gravity during use, this can increase the viscosity of the ink, rendering it unsuitable for printing requirements and, in turn, reducing print quality. Therefore, measuring and controlling the viscosity of the ink is crucial. It is essential to equip printing equipment with a device for measuring and adjusting the ink's viscosity, ensuring that the ink's viscosity meets the specified printing requirements.

[0003] Among them, the existing ink viscosity control devices are mainly of the falling ball type. When using a falling ball type ink viscosity control device, a pneumatic diaphragm pump is used to pump ink into the ink viscosity control device, causing ink to continuously flow from the bottom of the measuring tube and push the measuring ball in the measuring tube upward until the measuring ball moves to the top of the measuring tube. At this time, the ink will continuously overflow from the pipe at the top of the measuring tube to completely replace the original ink in the measuring tube. When measuring the viscosity of the ink, the measuring ball is allowed to fall at a constant speed. Two sensing components are used to determine the time it takes for the measuring ball to travel a set height distance. The speed of the measuring ball is then calculated, and the ink viscosity data is then obtained based on Stokes' law. Finally, the viscosity of the ink is reduced by adding an appropriate solvent to the measuring tube, and the ink viscosity is adjusted to meet the requirements.

[0004] However, during use, the rapid start and stop of the pneumatic diaphragm pump and inlet valve can cause water hammer, which can damage the measuring tube and increase maintenance costs. Furthermore, impurities in the ink can enter the measuring tube and jam the measuring ball. Therefore, the structure of existing ink viscosity control devices needs further optimization. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a falling ball type ink viscosity control device and control method, which can solve the problems of measuring tubes being easily damaged by water hammer and measuring balls being stuck by ink impurities.

[0006] According to a first embodiment of the present invention, a falling ball type ink viscosity control device comprises: A housing, comprising a liquid inlet chamber, an overflow chamber, an overflow channel, a liquid outlet channel, a first channel, a second channel, and a discharge channel, wherein the overflow chamber is located above the liquid inlet chamber, the overflow channel, the first channel, and the second channel all extend in a first direction, the liquid outlet channel and the discharge channel all extend in an up-down direction, and are respectively located on both sides of the overflow chamber along the first direction, the two ends of the overflow channel are respectively connected to the overflow chamber and the upper end of the liquid outlet channel, the two ends of the first channel are respectively connected to the overflow chamber and the upper end of the discharge channel, and the two ends of the second channel are respectively connected to the liquid inlet chamber and the discharge channel; A liquid inlet valve assembly, used to control the opening and closing of the liquid inlet of the liquid inlet cavity; A viscosity measuring assembly, comprising a measuring tube extending in an up-down direction, wherein both ends of the measuring tube are respectively connected to the liquid inlet cavity and the overflow cavity; a one-way valve, provided at the lower end of the discharge channel and in a normally closed state; a first piston member slidably disposed in the first channel; a second piston member slidably disposed in the second channel; Two electromagnet members are respectively arranged on both sides of the second channel along the first direction, and are used to magnetically drive the second piston member to move to the first position or the second position to control the connection between the liquid inlet chamber and the discharge channel, and are used to magnetically drive the one-way valve to open when the liquid inlet chamber and the discharge channel are connected; the first direction is perpendicular to the up and down direction.

[0007] According to the falling ball type ink viscosity control device of the first aspect embodiment of the present invention, there are at least the following beneficial effects: before measuring the ink viscosity, it is necessary to close the liquid inlet valve assembly and the existing pneumatic diaphragm pump to keep the ink in the measuring tube static and ensure measurement accuracy; before pumping the ink to the measuring tube, it is necessary to open the liquid inlet valve assembly and the pneumatic diaphragm pump; when the pneumatic diaphragm pump and the liquid inlet valve assembly are quickly started or closed, a negative water hammer effect will be generated in the liquid inlet chamber, the measuring tube and the overflow chamber. At this time, the one-way valve is in a closed state, the discharge channel, the part of the first channel connected to the discharge channel, and the part of the second channel connected to the discharge channel are all in an airtight state, and the first piston member in the first channel and the second piston member in the second channel will move along the first direction to absorb the water hammer impact energy and reduce the pressure fluctuation amplitude, thereby effectively weakening the water hammer pressure wave and avoiding the measuring tube from being easily broken due to the occurrence of the water hammer effect.

[0008] Moreover, when impurities in the ink exist in the measuring tube and cause the measuring ball to be stuck and unable to fall, the viscosity measuring component cannot measure the viscosity of the ink. Then, the electromagnet located on the side of the second channel away from the liquid inlet chamber along the first direction is energized to operate, so that the electromagnet exerts a magnetic attraction on the second piston member, driving the second piston member to move to the first position along the first direction away from the liquid inlet chamber, thereby causing the liquid inlet chamber, the second channel and the discharge channel to be connected. At the same time, the electromagnet also exerts a magnetic attraction on the one-way valve, driving the one-way valve to switch from a closed state to an open state, causing the discharge channel to be connected to the outside, so that the ink and impurities in the measuring tube can be discharged outward through the one-way valve, thereby effectively draining away the impurities in the ink and preventing the measuring ball from being stuck again and being unable to complete the ink viscosity measurement.

[0009] In some embodiments of the present invention, an iron core is provided inside the second piston member, and the electromagnet member located on the side of the second channel close to the liquid inlet chamber along the first direction is set as a first electromagnet, and the first electromagnet is used to magnetically attract the iron core to drive the second piston member to move to the second position, so that the liquid inlet chamber and the discharge channel are not connected to each other; the electromagnet member located on the side of the second channel away from the liquid inlet chamber along the first direction is set as a second electromagnet, and the second electromagnet is used to magnetically attract the iron core to drive the second piston member to move to the first position, so that the liquid inlet chamber and the discharge channel are connected, and is used to magnetically attract the valve core of the one-way valve to drive the one-way valve to switch to an open state.

[0010] In some embodiments of the present invention, the falling ball type ink viscosity control device also includes a control device, which has an impurity removal mode and a viscosity regulation mode. The control device is used to control the second electromagnet to be energized when the impurity removal mode is turned on, and is used to control the first electromagnet to be energized when the impurity removal mode is turned off.

[0011] In some embodiments of the present invention, the viscosity measuring assembly further includes a measuring ball and two sensing components, the measuring ball being disposed in the measuring tube and being able to move in the up and down directions in the measuring tube, the two sensing components being spaced apart in the up and down directions and being located between the liquid inlet chamber and the overflow chamber, each of the sensing components being disposed on the outside of the measuring tube and being configured to be triggered by the measuring ball to generate an electrical signal.

[0012] In some embodiments of the present invention, the control device is electrically connected to the liquid inlet valve assembly, the second electromagnet and the induction component located on the upper side, respectively. The control device is used to control the second electromagnet to be continuously energized for a second set time when the liquid inlet valve assembly is closed and the induction component located on the upper side does not generate an electrical signal within a first set time.

[0013] In some embodiments of the present invention, the control device is also electrically connected to the first electromagnet, and the control device is further used to control the second electromagnet to be powered off after the second electromagnet is powered on for the second set time, and to control the first electromagnet to be powered on for a third set time.

[0014] In some embodiments of the present invention, two first limiting portions arranged at intervals along a first direction are provided in the first channel, and the first piston member is configured to be able to move in an area defined between the two first limiting portions; two second limiting portions arranged at intervals along the first direction are provided in the second channel, and the second piston member is configured to be able to move in an area defined between the two second limiting portions.

[0015] In some embodiments of the present invention, the one-way valve is located below the second piston member, the second channel and the discharge channel are arranged to intersect vertically and form a cross structure, and the two second limit portions are respectively located on both sides of the discharge channel along the first direction; and / or, The shell is provided with an air hole communicated with the exhaust channel, the air hole is connected to a pumping air pipe, and the pumping air pipe is provided with a control valve.

[0016] A control method for a falling ball type ink viscosity control device according to a second embodiment of the present invention is applied to the falling ball type ink viscosity control device according to the first embodiment, and the control method comprises the following steps: Determine the current working mode; If the current working mode is the viscosity control mode, controlling the first electromagnet and the second electromagnet to be powered off; If the current working mode is the impurity removal mode, the second electromagnet is energized to move the second piston to the first position, so that the liquid inlet chamber and the discharge channel are connected and the one-way valve is opened; If the current working mode is switched from the impurity removal mode to the viscosity control mode, the second electromagnet is controlled to be de-energized so that the one-way valve closes automatically, and the first electromagnet is controlled to be energized so that the second piston moves to the second position, so that the liquid inlet chamber and the discharge channel are isolated from each other.

[0017] According to the control method of the falling ball type ink viscosity control device according to the second aspect of the embodiment of the present invention, there are at least the following beneficial effects: when the user sets the current working mode of the falling ball type ink viscosity control device to the viscosity control mode, the first electromagnet and the second electromagnet are in a power-off state, ensuring that the measuring ball in the measuring tube can fall at a uniform speed under the action of gravity, buoyancy and viscous resistance, thereby completing the viscosity measurement of the ink through the viscosity measuring component; when the user sets the current working mode of the falling ball type ink viscosity control device to the impurity removal mode, the second electromagnet is energized and generates a magnetic field, which can produce a magnetic attraction effect on the second piston member and the one-way valve, allowing the second piston member to move to the first position along the first direction under the magnetic action, causing the liquid inlet chamber to be connected to the discharge channel, so that the ink and impurities in the measuring tube can be discharged to the outside from the one-way valve, thereby completing the impurity removal work and preventing the measuring ball from being stuck by impurities and being unable to continue the ink viscosity measurement work.

[0018] After completing the impurity removal work, the user switches the current working mode of the falling ball type ink viscosity control device to the viscosity control mode, and cuts off the power to the second electromagnet to release the magnetic driving effect of the second electromagnet on the second piston member and the one-way valve, so that the discharge channel is isolated from the outside due to the automatic closing of the one-way valve. In addition, the first electromagnet is energized and generates a magnetic field to exert a magnetic driving effect on the second piston member, driving the second piston member to move along the first direction toward the liquid inlet chamber to the second position, so that the liquid inlet chamber and the discharge channel are not connected to each other, thereby avoiding the occurrence of ink discharge through the liquid inlet chamber and the discharge channel during the ink viscosity control process, and ensuring that the ink viscosity control work can be carried out.

[0019] According to a third embodiment of the present invention, a control method for a falling ball type ink viscosity control device is applied to the falling ball type ink viscosity control device as described in the first embodiment. The control method includes the following steps: When the liquid inlet valve assembly is closed and the induction component located on the upper side does not generate an electrical signal within a first set time, the second electromagnet is controlled to be continuously energized for a second set time, so that the second piston is located in the first position, the liquid inlet chamber is connected to the discharge channel, and the one-way valve is opened; After the second electromagnet is continuously energized for the second set time, the second electromagnet is controlled to be de-energized to close the one-way valve, and the first electromagnet is controlled to be continuously energized for a third set time to position the second piston member in the second position, so that the liquid inlet chamber and the discharge channel are not connected to each other.

[0020] According to the control method of the falling ball type ink viscosity control device of the third aspect of the present invention, there are at least the following beneficial effects: when the liquid inlet valve assembly is closed and the ink input to the measuring tube is stopped, the ink viscosity can be measured. At this time, the measuring ball in the measuring tube will fall at a uniform speed, and the speed of the measuring ball can be obtained by the time difference between the two sensing components generating electrical signals in succession, and then the viscosity data of the ink can be calculated according to Stokes' law; when the sensing component located on the upper side still fails to be triggered by the measuring ball to generate an electrical signal within the first set time, it means that the measuring ball is stuck by impurities in the ink, then, the second electromagnet is controlled to remain energized within the second set time, so that the second piston can move to the first position under the action of magnetic attraction drive, and at the same time, the one-way valve is switched from a closed state to an open state under the action of magnetic attraction drive, so that the ink and impurities in the measuring tube can be discharged to the outside, which is convenient for the subsequent use of the measuring ball to complete the ink viscosity measurement.

[0021] When the second electromagnet is continuously energized for the second set time, the ink and impurities in the measuring tube are completely discharged. The second electromagnet is then controlled to be de-energized, thereby releasing the magnetic drive effect on the second piston and the one-way valve, and switching the one-way valve from an open state to a closed state. In addition, the first electromagnet is controlled to be continuously energized for a third set time, so that the second piston can move to the second position under the action of the magnetic drive, prompting the second piston to separate the liquid inlet chamber from the discharge channel, thereby preventing the subsequent pumped ink from being discharged through the discharge channel, thereby ensuring that the ink viscosity control work can be carried out.

[0022] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a connection diagram of an ink viscosity control device in the prior art in a viscosity control working state; Figure 2 1 is a schematic diagram of the internal structure of the falling ball type ink viscosity control device provided by an embodiment of the present invention when in a viscosity control mode; Figure 3 1 is a schematic diagram of the internal structure of the falling ball type ink viscosity control device provided by an embodiment of the present invention when in impurity removal mode; Figure 4 1 is a schematic diagram of the internal structure of a falling ball type ink viscosity control device provided by another embodiment of the present invention when in a viscosity control mode; Figure 5This is a schematic diagram of electrical connections between a control device, a first electromagnet, and a second electromagnet in a falling-ball type ink viscosity control device provided by an embodiment of the present invention; Figure 6 1 is a schematic diagram of electrical connections among a control device, a first electromagnet, a second electromagnet, a liquid inlet valve assembly, and a first sensing component in a falling-ball type ink viscosity control device provided by another embodiment of the present invention; Figure 7 This is a schematic diagram of a specific flow chart of a control method for a falling ball type ink viscosity control device provided by an embodiment of the present invention; Figure 8 It is a specific flow chart of a control method of a falling ball type ink viscosity control device provided by another embodiment of the present invention.

[0024] The numbers in the accompanying drawings are as follows: 100, falling ball type ink viscosity control device; 111, measuring tube; 112, measuring ball; 113, sensing component; 121, liquid inlet chamber; 122, liquid inlet; 123, overflow chamber; 124, overflow channel; 125, liquid outlet channel; 126, pipe joint; 131, first channel; 132, discharge channel; 133, air hole; 134, second channel; 141, first electromagnet; 142, second electromagnet; 143, second piston member; 144, iron core; 145, first piston member; 150, one-way valve; 161, first sealing plug; 162, second sealing plug; 171, housing; 172, first plug; 173, second plug; 200, control device; 300, solvent barrel; 400, heating device; 500, pneumatic diaphragm pump; 600, ink basin; 700, ink barrel. DETAILED DESCRIPTION

[0025] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0027] In the description of the present invention, if words such as "several" are used, they mean one or more; "more" means two or more; "greater than," "less than," and "exceed" are understood to exclude the number itself; and "above," "below," and "within" are understood to include the number itself. The terms "first," "second," and "third" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number of the indicated technical features, or as implicitly specifying the order of the indicated technical features.

[0028] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0029] Reference Figures 1 to 8 , several embodiments of the falling ball type ink viscosity control device and control method thereof of the present invention are given below.

[0030] like Figures 1 to 6 As shown, the falling ball type ink viscosity control device 100 provided in accordance with the embodiment of the first aspect of the present invention can be used as a supporting equipment in a printing device, mainly realizing viscosity measurement and adjustment of the ink in the ink barrel 700, thereby ensuring the good quality of ink printing and spraying of the printing device.

[0031] like Figure 1 As shown, when an existing printing device is equipped with the falling-ball ink viscosity control device 100 of this embodiment, the pneumatic diaphragm pump 500 is connected to an ink barrel 700 and an ink basin 600 via pipelines, respectively, to transfer ink from the ink barrel 700 to the ink basin 600 for use by the printing device. The ink basin 600 is connected to the ink barrel 700 via an overflow pipeline to return overflowed ink to the ink barrel 700. The pneumatic diaphragm pump 500 is also connected to a heating device 400 via a pipeline, and the heating device 400 is connected to the ink inlet of the falling-ball ink viscosity control device 100 via a pipeline. Through pumping and heating, the ink at a predetermined temperature is transferred to the falling-ball ink viscosity control device 100 for ink measurement and control.

[0032] Furthermore, the solvent barrel 300 has a cavity for holding solvent. A delivery pump is connected to the solvent barrel 300 and the solvent inlet of the falling-ball ink viscosity control device 100 via pipelines. Through pumping action, the solvent is delivered to the falling-ball ink viscosity control device 100, thereby replenishing the solvent and reducing the ink viscosity. The ink outlet of the falling-ball ink viscosity control device 100 is connected to the ink barrel 700 via a pipeline, delivering the regulated ink to the ink barrel 700 to ensure that the ink viscosity within the ink barrel 700 meets the printing requirements. Furthermore, the control device 200 is electrically connected to the falling-ball ink viscosity control device 100, the heating device 400, and the pneumatic diaphragm pump 500 to control their operating states.

[0033] The falling ball type ink viscosity control device 100 has a first direction and an up-down direction, wherein the first direction is perpendicular to the up-down direction. In this embodiment, it is assumed that the first direction is the left-right direction.

[0034] like Figures 2 to 6 As shown, the falling ball type ink viscosity control device 100 includes a housing 171, a liquid inlet valve assembly, a viscosity measuring assembly, a one-way valve 150, a first piston member 145, a second piston member 143 and an electromagnet member.

[0035] The housing 171 is hollow and has a liquid inlet chamber 121 and an overflow chamber 123 formed therein. Furthermore, the housing 171 is provided with an overflow channel 124, a liquid outlet channel 125, a first channel 131, a second channel 134, and a discharge channel 132. The overflow chamber 123 is located above the liquid inlet chamber 121, and the overflow chamber 123 and the liquid inlet chamber 121 are disposed vertically opposite each other. The overflow channel 124, the first channel 131, and the second channel 134 all extend along a first direction. The liquid outlet channel 125 and the discharge channel 132 both extend in a vertical direction. Furthermore, the liquid outlet channel 125 and the discharge channel 132 are respectively located on either side of the overflow chamber 123 along the first direction, meaning that the overflow chamber 123 is disposed between the liquid outlet channel 125 and the discharge channel 132. The two ends of the overflow channel 124 along the first direction are respectively connected to the overflow chamber 123 and the upper end of the liquid outlet channel 125, the two ends of the first channel 131 along the first direction are respectively connected to the overflow chamber 123 and the upper end of the discharge channel 132, and the two ends of the second channel 134 along the first direction are respectively connected to the liquid inlet chamber 121 and the discharge channel 132.

[0036] It is understood that the specific shapes of the liquid inlet chamber 121 and the overflow chamber 123 are not limited and can be set according to actual design requirements. The liquid inlet chamber 121 can accommodate the solvent and the ink to be measured. A liquid inlet port 122 is provided on a horizontal side of the liquid inlet chamber 121. The liquid inlet port 122 can connect to the solvent inlet and the ink inlet respectively through different pipelines, so that a certain amount of ink and a certain amount of solvent can enter the liquid inlet chamber 121. In this embodiment, the overflow channel 124, the liquid outlet channel 125, the first channel 131, the second channel 134, and the discharge channel 132 are channels with a circular cross-section. The lower end of the liquid outlet channel 125 passes through the lower surface of the shell 171. The lower end of the liquid outlet channel 125 is the ink outlet. A pipe joint 126 is provided at the ink outlet. The pipe joint 126 is detachably connected to the shell 171. The pipe joint 126 can be connected to one end of the return pipe. The other end of the return pipe is connected to the ink barrel 700, so that the ink in the falling ball type ink viscosity control device 100 can flow back into the ink barrel 700.

[0037] The liquid inlet valve assembly is used to control the opening and closing of the liquid inlet port 122 of the liquid inlet chamber 121. When the liquid inlet valve assembly is closed, neither ink nor solvent can enter the liquid inlet chamber 121. When the liquid inlet valve assembly is opened, ink and solvent can flow into the liquid inlet chamber 121. It will be understood that the liquid inlet valve assembly can include two electric valves, one corresponding to the solvent inlet and the other to control the flow rate of ink and solvent into the liquid inlet chamber 121.

[0038] The viscosity measurement assembly measures the viscosity of ink. It includes a measuring tube 111, which extends vertically. Its upper and lower ends are connected to the liquid inlet chamber 121 and the overflow chamber 123, respectively. Therefore, as ink flows into the liquid inlet chamber 121, it flows upward, sequentially through the measuring tube 111 and the overflow chamber 123, then out through the overflow channel 124 and the liquid outlet channel 125, ultimately returning to the ink barrel 700. In this embodiment, the measuring tube 111 is a thin-walled circular tube.

[0039] Furthermore, the viscosity measurement assembly also includes a measuring ball 112 and two sensing components 113. The measuring ball 112 is disposed within the measuring tube 111 and is capable of moving up and down within the measuring tube 111. It is understood that the outer diameter of the measuring ball 112 is smaller than the inner diameter of the measuring tube 111, and the measuring ball 112 moves up and down within the inner cavity of the measuring tube 111. Furthermore, a certain distance exists between the measuring ball 112 and the inner wall of the measuring tube 111 to allow ink to pass through. To allow ink to enter and exit the measuring tube 111, a number of fluid passages may be provided at the upper and lower ends of the measuring tube 111. Ink flowing into the measuring tube 111 pushes the measuring ball 112 upward until it reaches its position within the measuring tube 111, allowing the ink to flow from the measuring tube 111 into the overflow chamber 123.

[0040] Two sensing components 113 are spaced vertically apart and located between the liquid inlet chamber 121 and the overflow chamber 123. The vertical spacing between the two sensing components 113 is less than the length of the measuring tube 111. Each sensing component 113 is located outside the measuring tube 111 and is configured to be triggered by the measuring ball 112 to generate an electrical signal.

[0041] It is understandable that the measuring tube 111 and the two sensing components 113 are fixedly mounted in the accommodating cavity of the housing 171. The sensing component 113 detects the height position of the measuring ball 112 by non-contact sensing. Specifically, when the measuring ball 112 passes through the sensing component 113 during its up and down movement, the sensing component 113 is triggered to generate an electrical signal. In some examples, the measuring ball 112 is a metal ball, and the sensing component 113 is a metal sensor. In other examples, the measuring ball 112 is a magnetic metal ball, and the sensing component 113 is a magnetic sensor. The viscosity measurement value of the ink is obtained by obtaining the time difference generated by the electrical signals of the two sensing components 113 and calculating according to Stokes' law. The viscosity measurement component is a prior art, and those skilled in the art should clearly understand its specific structure and working principle, which will not be further explained here.

[0042] The one-way valve 150 is provided at the lower end of the discharge channel 132 . The lower end of the discharge channel 132 passes through the lower surface of the shell 171 . The one-way valve 150 is detachably connected to the shell 171 . Moreover, the one-way valve 150 is in a normally closed state.

[0043] It is understood that in some examples, the one-way valve 150 uses a swing-driven valve core, and the valve core swings downward under the action of gravity to close the one-way valve 150, such as Figure 2 and Figure 3In other examples, the one-way valve 150 uses a spring-driven valve core, and the valve core moves downward under the elastic force of the spring, and the one-way valve 150 is closed, as shown in FIG. Figure 4 As shown. The lower end of the one-way valve 150 may be connected to a pipe to discharge the liquid flowing out of the one-way valve 150 to a predetermined location. Of course, a container may be used to receive the liquid flowing out of the one-way valve 150. External air pressure cannot drive the one-way valve 150 from the closed state to the open state, so the one-way valve 150 is always in the closed state.

[0044] First piston member 145 is slidably disposed within first channel 131, enabling linear movement along a first direction within first channel 131. The outer circumference of first piston member 145 is in close contact with the inner circumference of first channel 131, enabling first piston member 145 to provide an excellent seal and divide first channel 131 into two sections. First piston member 145 may be made of rubber.

[0045] The second piston member 143 is slidably disposed within the second channel 134, enabling linear movement along the second direction within the second channel 134. The outer circumference of the second piston member 143 is in close contact with the inner circumference of the second channel 134, enabling the second piston member 143 to provide an excellent seal and divide the second channel 134 into two sections. The second piston member 143 can be made of rubber and contains an iron core 144, which moves with the second piston member 143.

[0046] Two electromagnets are provided, spaced apart along a first direction, and positioned on either side of the second channel 134 along the first direction. In this embodiment, one electromagnet is positioned on a side of the liquid outlet channel 125 away from the liquid inlet chamber 121 along the first direction, and the other electromagnet is positioned on a side of the discharge channel 132 away from the liquid inlet chamber 121 along the first direction. The two electromagnets are positioned opposite each other along the first direction. The housing 171 is provided with a mounting cavity for accommodating the electromagnets. The electromagnets generate a magnetic field when powered on, but do not generate a magnetic field when powered off.

[0047] Moreover, the two electromagnet parts can be used to magnetically drive the second piston part 143 to move to the first position or the second position to control the connection between the liquid inlet chamber 121 and the discharge channel 132, and can be used to magnetically drive the one-way valve 150 to open when the liquid inlet chamber 121 and the discharge channel 132 are connected.

[0048] Specifically, the electromagnet member located on the side of the second channel 134 that is closer to the liquid inlet chamber 121 along the first direction is configured as the first electromagnet 141. In this embodiment, the first electromagnet 141 is located on the side of the liquid outlet channel 125 that is farther away from the liquid inlet chamber 121 along the first direction. The function of the first electromagnet 141 is to magnetically attract the iron core 144 in the second piston member 143, thereby driving the second piston member 143 to move within the second channel 134 along the first direction to the second position. This disconnects the liquid inlet chamber 121 and the discharge channel 132 due to the separation and sealing effect of the second piston member 143.

[0049] The electromagnet member located on the side of the second channel 134 away from the liquid inlet chamber 121 along the first direction is configured as a second electromagnet 142. In this embodiment, the second electromagnet 142 is located on the side of the discharge channel 132 away from the liquid inlet chamber 121 along the first direction. The function of the second electromagnet 142 is to magnetically attract the iron core 144 in the second piston member 143, thereby driving the second piston member 143 to move along the first direction to the first position within the second channel 134, thereby enabling communication between the liquid inlet chamber 121 and the discharge channel 132. At this time, the second piston member 143 cannot perform its separating and sealing functions. In addition, the second electromagnet 142 can also be used to magnetically attract the valve core of the one-way valve 150, thereby driving the one-way valve 150 to switch to an open state.

[0050] It can be understood that since the one-way valve 150 is in a normally closed state, the valve core of the one-way valve 150 is magnetically conductive and can be actuated by magnetic attraction. Therefore, when the second electromagnet 142 is energized, the valve core of the one-way valve 150 can be actuated by the magnetic field generated by the second electromagnet 142, prompting the one-way valve 150 to be opened, so that the exhaust channel 132 can be connected to the outside.

[0051] In some examples, such as Figures 2 to 4 As shown, the second piston member 143 has guide portions at both ends along the first direction, and the guide portions may be chamfered. Furthermore, the one-way valve 150 is located below the second piston member 143, and the second channel 134 and the discharge channel 132 are arranged to intersect perpendicularly, so that the second channel 134 and the discharge channel 132 together form a cross structure. The first position is located on the side of the discharge channel 132 away from the liquid inlet chamber 121 along the first direction, and the second position is located on the side of the discharge channel 132 closer to the liquid inlet chamber 121 along the first direction. The dimension of the second piston member 143 along the first direction (i.e., the length dimension) is greater than the dimension of the discharge channel 132 along the first direction (i.e., the inner diameter dimension). Therefore, the second piston member 143 can move along the first direction and move back and forth between the first position and the second position.

[0052] When the second piston member 143 moves to the first position, one end of the second piston member 143 close to the liquid inlet chamber 121 along the first direction is located at the first position or in the discharge channel 132, causing the interior of the measuring tube 111, the liquid inlet chamber 121, the second channel 134 and the discharge channel 132 to be connected in sequence; moreover, the one-way valve 150 is in the open state at this time, so when the liquid is stopped from being supplied to the liquid inlet chamber 121, the ink in the measuring tube 111 can flow through the interior of the measuring tube 111, the liquid inlet chamber 121, the second channel 134, the discharge channel 132 and the one-way valve 150 in sequence and be discharged outward.

[0053] Of course, in other examples, the second piston member 143 may be provided with a plurality of L-shaped drain holes, one end of which penetrates an end surface of the second piston member 143 that is closer to the liquid inlet chamber 121 along the first direction, and the other end of which penetrates the outer circumference of the second piston member 143. The second channel 134 and the drain channel 132 are vertically connected and together form a T-shaped structure. When the second piston member 143 moves to the first position, the end of the second piston member 143 that is farther away from the liquid inlet chamber 121 along the first direction is located within the drain channel 132. At this time, the drain holes are connected to the second channel 134 and the drain channel 132, so that liquid in the liquid inlet chamber 121 can flow into the drain channel 132 through the drain holes. When the entire outer circumference of the second piston member 143 is in contact with the inner circumference of the second channel 134, one end of the drain hole is closed, and liquid in the liquid inlet chamber 121 cannot flow into the drain channel 132 through the drain holes.

[0054] During use of the falling-ball ink viscosity control device 100 provided in an embodiment of the present invention, before measuring ink viscosity, the inlet valve assembly and pneumatic diaphragm pump 500 must be closed to stop the flow of ink or solvent into the liquid inlet chamber 121. This allows the ink in the measuring tube 111 to remain static, thereby ensuring accurate ink viscosity measurement. Before pumping ink from the ink barrel 700 into the liquid inlet chamber 121, the inlet valve assembly and pneumatic diaphragm pump 500 must be opened to allow the ink to flow into the liquid inlet chamber 121.

[0055] During rapid startup or shutdown of the pneumatic diaphragm pump 500 and the inlet valve assembly, negative water hammer can occur within the inlet chamber 121, the measuring tube 111, and the overflow chamber 123, potentially damaging the measuring tube 111. At this time, since the check valve 150 is closed, the discharge passage 132, the portion connecting the first passage 131 with the discharge passage 132, and the portion connecting the second passage 134 with the discharge passage 132 are all airtight (i.e., a certain air pressure exists). Therefore, under the influence of the air pressure and the negative water hammer, the first piston member 145 within the first passage 131 and the second piston member 143 within the second passage 134 move in a first direction to absorb the water hammer impact energy and reduce the pressure fluctuations. This effectively mitigates the water hammer pressure fluctuations, effectively preventing the measuring tube 111 from rupturing due to the water hammer effect, extending the service life of the measuring tube 111, significantly reducing the number of times the measuring tube 111 needs to be disassembled and replaced within the housing 171, and reducing maintenance costs.

[0056] Furthermore, when impurities from the ink are present in the measuring tube 111, causing the measuring ball 112 to become stuck and unable to fall, and the viscosity measurement assembly to be unable to measure the viscosity of the ink, the electromagnet (i.e., the second electromagnet 142) located on the side of the second channel 134 away from the liquid inlet chamber 121 in the first direction is energized, causing the electromagnet to magnetically attract the second piston 143, forcing the second piston 143 to move in the first direction away from the liquid inlet chamber 121 to the first position, thereby connecting the liquid inlet chamber 121, the second channel 134, and the discharge channel 132. Simultaneously, the electromagnet also magnetically attracts the one-way valve 150, forcing the one-way valve 150 to switch from a closed state to an open state, causing the discharge channel 132 to be connected to the outside, allowing the ink in the measuring tube 111 to be discharged through the one-way valve 150. This effectively and automatically removes impurities from the ink, prevents the measuring ball 112 from becoming stuck again, and prevents the ink viscosity measurement from being unable to be completed. This reduces operational difficulty and improves the degree of automation.

[0057] It can be understood that when the ink and impurities in the measuring tube 111 are discharged, the first piston member 145 can move along the first direction under the action of the pressure difference.

[0058] In some embodiments, the falling-ball ink viscosity control device 100 further includes a control device 200. The control device 200 can be integrated with the housing 171 or separated from the housing 171. The control device 200 can be a host computer or a touchscreen display. The falling-ball ink viscosity control device 100 has an impurity removal mode and a viscosity control mode. The control device 200 controls the second electromagnet 142 to be energized when the impurity removal mode is enabled, and controls the first electromagnet 141 to be energized when the impurity removal mode is disabled.

[0059] It can be understood that when the user operates the control device 200 to enable the impurity removal mode of the falling ball type ink viscosity control device 100, the control device 200 can generate a control instruction to enable the second electromagnet 142 to be energized, drive the second piston 143 to move to the first position, and drive the one-way valve 150 to switch to the open state, thereby discharging the ink and impurities in the measuring tube 111 and completing the impurity removal work in the measuring tube 111.

[0060] When the user disables the impurity removal mode via the control device 200, the second electromagnet 142 is de-energized under the control of the control device 200, and the magnetic field generated by the second electromagnet 142 disappears, causing the one-way valve 150 to automatically switch from the open state to the closed state. Simultaneously, the first electromagnet 141 is energized and generates a magnetic field. The second piston 143 moves in the first direction to the second position under the influence of the magnetic field generated by the first electromagnet 141, causing the second piston 143 to return to its original position. When the viscosity control mode is enabled, during the process of delivering ink to the liquid chamber 121, the first piston 145 and the second piston 143 move in the first direction due to the pressure of the ink and the air pressure in the discharge channel 132, thereby achieving a force balance.

[0061] In some embodiments, the control device 200 is electrically connected to the liquid inlet valve assembly, the second electromagnet 142, and the upper sensing component 113 via circuits. The upper sensing component 113 is configured as the first sensing component. Thus, the control device 200 can transmit signals to the liquid inlet valve assembly, the second electromagnet 142, and the first sensing component. Furthermore, the control device 200 can be configured to control the second electromagnet 142 to remain energized for a second set time when the liquid inlet valve assembly is closed and the upper sensing component 113 (i.e., the first sensing component) does not generate an electrical signal within a first set time.

[0062] It is understood that the first set time and the second set time can be set based on actual conditions, for example, by calculating the first set time and the second set time through multiple tests. When the inlet valve assembly is closed, ink delivery ceases, and the measuring ball 112 in the measuring tube 111 begins to fall. If the measuring ball 112 does not fall within the first set time and triggers the upper sensing component 113, it indicates that the falling process of the measuring ball 112 is blocked, and it is necessary to drain the ink and impurities in the measuring tube 111. During the impurity removal operation, the second electromagnet 142 remains energized during the second set time, ensuring that the second piston 143 moves to the first position and that the ink and impurities in the measuring tube 111 are completely drained.

[0063] Of course, it is not ruled out that in other embodiments, a flow sensor is provided at the lower end of the one-way valve 150 or on the external discharge pipe connected to the one-way valve 150. When the flow sensor detects that no liquid flows out of the one-way valve 150, it indicates that the external discharge work is completed. At this time, the second electromagnet 142 can be switched from the power-on state to the power-off state.

[0064] By such a configuration, it is possible to automatically identify whether the measuring ball 112 in the measuring tube 111 is stuck, and automatically control the discharge of ink and impurities in the measuring tube 111, thereby improving the degree of automation of the falling ball type ink viscosity control device 100.

[0065] Furthermore, the control device 200 can be electrically connected to the first electromagnet 141 through a circuit. The control device 200 is further configured to control the second electromagnet 142 to be de-energized after the second electromagnet 142 is energized for a second set time, and to control the first electromagnet 141 to be energized for a third set time.

[0066] It can be understood that when the second electromagnet 142 is powered on for the second set time, the ink and impurities in the measuring tube 111 have been discharged. At this time, the second electromagnet 142 can be powered off and stop working. At the same time, the first electromagnet 141 is powered on and continuously powered on for the third set time, so that the second piston 143 moves to the second position in the second channel 134, ensuring that the second piston 143 is automatically reset.

[0067] In some embodiments, two first limiting portions are provided in the first channel 131 along the first direction, and the two first limiting portions are arranged at a certain interval along the first direction. The first limiting portions can limit the first piston member 145, and the first piston member 145 is located between the two first limiting portions. The first piston member 145 is configured to move in the area defined between the two first limiting portions.

[0068] In this embodiment, if Figures 2 to 4 As shown, the overflow channel 124 and the first channel 131 are coaxially arranged. The inner diameter of the first channel 131 is equal to or smaller than the inner diameter of the overflow channel 124. The end of the overflow channel 124, which is away from the overflow chamber 123 along the first direction, passes through the side of the housing 171 to form a first opening. The first piston member 145 can be placed in the first channel 131 through the first opening, the overflow channel 124, and the overflow chamber 123. A removable first plug 172 is provided at the first opening.

[0069] The overflow chamber 123 extends upward through the upper surface of the housing 171 to form a second opening. A second sealing plug 162 is threadedly connected to the second opening. The lower end of the second sealing plug 162 extends downward to form a first stopper, which limits the distance the first piston member 145 can move toward the overflow chamber 123. Furthermore, the inner circumference of the first channel 131, at one end thereof, facing away from the overflow chamber 123, is raised in the first direction to form another first stopper. This first stopper is annular in shape and limits the distance the first piston member 145 can move toward the discharge channel 132.

[0070] In some embodiments, two second limiting portions are provided in the second channel 134 along the first direction, and the two second limiting portions are arranged at a certain interval along the first direction. The second limiting portions can limit the second piston member 143, and the second piston member 143 is located between the two second limiting portions. The second piston member 143 is configured to move in the area defined between the two second limiting portions.

[0071] In this embodiment, if Figures 2 to 4 As shown, the second channel 134 and the discharge channel 132 are arranged to intersect vertically and form a cross structure together. Moreover, the end of the second channel 134 away from the liquid inlet chamber 121 along the first direction passes through the side of the shell 171 to form a third opening, and the second piston member 143 can be placed in the second channel 134 through the third opening. A removable second plug 173 is provided at the third opening. The two second limiting portions are respectively located on both sides of the discharge channel 132 along the first direction. The second plug 173 can form one of the second limiting portions. The liquid inlet chamber 121 passes downward through the lower surface of the shell 171 to form a fourth opening. The fourth opening is threadedly connected to the first sealing plug 161. The upper end of the first sealing plug 161 extends upward and forms another second limiting portion.

[0072] In some embodiments, as Figures 2 to 4 As shown, the housing 171 is provided with an air hole 133, which is in communication with the exhaust passage 132. The air hole 133 is connected to a pumping air pipe, which is provided with a control valve. The control valve can be electrically connected to the control device 200.

[0073] It will be appreciated that the pumping air pipe can be connected to a gas storage tank and a vacuum pump via pipelines. The opening and closing of a control valve controls the flow of air between the pumping air pipe and the air hole 133. The pumping air pipe delivers or extracts gas into or from the discharge channel 132 to control the air pressure within the discharge channel 132. The gas can be an inert gas or air. The location of the air hole 133 is not limited.

[0074] like Figures 1 to 5 、 Figure 7As shown, the control method of the falling ball type ink viscosity control device 100 provided in accordance with the second embodiment of the present invention is applied to the falling ball type ink viscosity control device 100 in accordance with the first embodiment. The control method includes the following steps: Step S11: Determine the current working mode.

[0075] Step S12: If the current working mode is the viscosity control mode, the first electromagnet 141 and the second electromagnet 142 are controlled to be de-energized.

[0076] Step S13: If the current working mode is the impurity removal mode, the second electromagnet 142 is energized to move the second piston 143 to the first position, so that the liquid inlet chamber 121 and the discharge channel 132 are connected, and the one-way valve 150 is opened.

[0077] Step S14: If the current working mode is switched from the impurity removal mode to the viscosity control mode, the second electromagnet 142 is controlled to be de-energized so that the one-way valve 150 closes automatically, and the first electromagnet 141 is controlled to be energized so that the second piston 143 moves to the second position, so that the liquid inlet chamber 121 and the discharge channel 132 are isolated from each other.

[0078] It can be understood that when the user sets the current working mode of the falling ball type ink viscosity control device 100 to the viscosity control mode, the first electromagnet 141 and the second electromagnet 142 are in the power-off state, ensuring that the measuring ball 112 in the measuring tube 111 can fall at a uniform speed under the action of gravity, buoyancy and viscous resistance, thereby completing the viscosity measurement of the ink through the viscosity measurement component; when the user sets the current working mode of the falling ball type ink viscosity control device 100 to the impurity removal mode, the second electromagnet 142 is energized and generates a magnetic field, which can produce a magnetic attraction on the second piston member 143 and the one-way valve 150, allowing the second piston member 143 to move to the first position along the first direction under the magnetic action, causing the liquid inlet chamber 121 to be connected to the discharge channel 132, so that the ink and impurities in the measuring tube 111 can be discharged to the outside through the one-way valve 150, thereby completing the impurity removal work and preventing the measuring ball 112 from being stuck by impurities and being unable to continue the ink viscosity measurement work.

[0079] After the impurity removal work is completed, the user switches the current working mode of the falling ball type ink viscosity control device 100 to the viscosity control mode, and de-energizes the second electromagnet 142 to release the magnetic driving effect of the second electromagnet 142 on the second piston member 143 and the one-way valve 150, so that the discharge channel 132 is isolated from the outside due to the automatic closing of the one-way valve 150. In addition, the first electromagnet 141 is energized to generate a magnetic field to exert a magnetic driving effect on the second piston member 143, driving the second piston member 143 to move along the first direction toward the liquid inlet chamber 121 to the second position, so that the liquid inlet chamber 121 and the discharge channel 132 are disconnected from each other, thereby preventing ink from being discharged through the liquid inlet chamber 121 and the discharge channel 132 during the ink viscosity control process, thereby ensuring that the ink viscosity control work can be carried out.

[0080] like Figures 1 to 4 、 Figure 6 and Figure 8 As shown, the control method of the falling ball type ink viscosity control device 100 provided in accordance with the third embodiment of the present invention is applied to the falling ball type ink viscosity control device 100 in accordance with the first embodiment. The control method includes the following steps: Step S21: When the liquid inlet valve assembly is closed and the sensing component 113 located on the upper side does not generate an electrical signal within the first set time, the second electromagnet 142 is controlled to be continuously energized for the second set time so that the second piston member 143 is located in the first position, so that the liquid inlet chamber 121 is connected to the discharge channel 132 and the one-way valve 150 is opened.

[0081] Step S22: After the second electromagnet 142 is continuously energized for a second set time, the second electromagnet 142 is controlled to be de-energized to close the one-way valve 150, and the first electromagnet 141 is controlled to be continuously energized for a third set time to locate the second piston member 143 in the second position, so that the liquid inlet chamber 121 and the discharge channel 132 are not connected to each other.

[0082] It can be understood that when the liquid inlet valve assembly is closed and the ink is stopped from being input into the measuring tube 111, the ink viscosity can be measured. At this time, the measuring ball 112 in the measuring tube 111 will fall at a uniform speed, and the speed of the measuring ball 112 is obtained by the time difference between the two sensing components 113 generating electrical signals in succession, and then the viscosity data of the ink is calculated according to Stokes' law; when the sensing component 113 located on the upper side still fails to be triggered by the measuring ball 112 to generate an electrical signal within the first set time, it means that the measuring ball 112 is stuck by impurities in the ink, then, the second electromagnet 142 is controlled to remain energized for the second set time, so that the second piston 143 can move to the first position under the action of magnetic attraction, and at the same time, the one-way valve 150 is switched from a closed state to an open state under the action of magnetic attraction, so that the ink and impurities in the measuring tube 111 can be discharged to the outside, so that the measuring ball 112 can be used to complete the ink viscosity measurement work later.

[0083] When the second electromagnet 142 is continuously energized for the second set time, the ink and impurities in the measuring tube 111 are completely discharged. The second electromagnet 142 is then controlled to be de-energized, releasing the magnetic drive action on the second piston member 143 and the one-way valve 150, so that the one-way valve 150 switches from an open state to a closed state. In addition, the first electromagnet 141 is controlled to be continuously energized for a third set time, so that the second piston member 143 can move to the second position under the action of the magnetic drive, prompting the second piston member 143 to separate the liquid inlet chamber 121 from the discharge channel 132, thereby preventing the subsequent pumped ink from being discharged through the discharge channel 132, thereby ensuring that the ink viscosity control work can be carried out.

[0084] The above specifically describes the preferred embodiments of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A falling ball type ink viscosity control device, characterized in that: include: A housing, comprising a liquid inlet chamber, an overflow chamber, an overflow channel, a liquid outlet channel, a first channel, a second channel, and a discharge channel, wherein the overflow chamber is located above the liquid inlet chamber, the overflow channel, the first channel, and the second channel all extend in a first direction, the liquid outlet channel and the discharge channel all extend in an up-down direction, and are respectively located on both sides of the overflow chamber along the first direction, the two ends of the overflow channel are respectively connected to the overflow chamber and the upper end of the liquid outlet channel, the two ends of the first channel are respectively connected to the overflow chamber and the upper end of the discharge channel, and the two ends of the second channel are respectively connected to the liquid inlet chamber and the discharge channel; A liquid inlet valve assembly, used to control the opening and closing of the liquid inlet of the liquid inlet cavity; A viscosity measuring assembly, comprising a measuring tube extending in an up-down direction, wherein both ends of the measuring tube are respectively connected to the liquid inlet cavity and the overflow cavity; a one-way valve, provided at the lower end of the discharge channel and in a normally closed state; a first piston member slidably disposed in the first channel; a second piston member slidably disposed in the second channel; Two electromagnet members are respectively arranged on both sides of the second channel along the first direction, and are used to magnetically drive the second piston member to move to the first position or the second position to control the connection between the liquid inlet chamber and the discharge channel, and are used to magnetically drive the one-way valve to open when the liquid inlet chamber and the discharge channel are connected; the first direction is perpendicular to the up and down direction.

2. The falling ball type ink viscosity control device according to claim 1, characterized in that: An iron core is provided inside the second piston member, and the electromagnet member located on the side of the second channel close to the liquid inlet chamber along the first direction is set as a first electromagnet. The first electromagnet is used to magnetically attract the iron core to drive the second piston member to move to the second position, so that the liquid inlet chamber and the discharge channel are not connected to each other; the electromagnet member located on the side of the second channel away from the liquid inlet chamber along the first direction is set as a second electromagnet. The second electromagnet is used to magnetically attract the iron core to drive the second piston member to move to the first position, so that the liquid inlet chamber and the discharge channel are connected, and is used to magnetically attract the valve core of the one-way valve to drive the one-way valve to switch to an open state.

3. The falling ball type ink viscosity control device according to claim 2, characterized in that: It also includes a control device, and the falling ball type ink viscosity control device has an impurity removal mode and a viscosity regulation mode. The control device is used to control the second electromagnet to be energized when the impurity removal mode is turned on, and is used to control the first electromagnet to be energized when the impurity removal mode is turned off.

4. The falling ball type ink viscosity control device according to claim 3, characterized in that: The viscosity measuring assembly also includes a measuring ball and two sensing components. The measuring ball is arranged in the measuring tube and can move in the up and down directions in the measuring tube. The two sensing components are arranged at intervals in the up and down directions and are located between the liquid inlet chamber and the overflow chamber. Each of the sensing components is arranged on the outside of the measuring tube and is configured to be triggered by the measuring ball to generate an electrical signal.

5. The falling ball type ink viscosity control device according to claim 4, characterized in that: The control device is electrically connected to the liquid inlet valve assembly, the second electromagnet and the induction component located on the upper side, respectively. The control device is used to control the second electromagnet to be continuously energized for a second set time when the liquid inlet valve assembly is closed and the induction component located on the upper side does not generate an electrical signal within a first set time.

6. The falling ball type ink viscosity control device according to claim 5, characterized in that: The control device is also electrically connected to the first electromagnet, and is further configured to control the second electromagnet to be powered off after the second electromagnet is powered on for the second set time, and to control the first electromagnet to be powered on for a third set time.

7. The falling ball type ink viscosity control device according to claim 1, characterized in that: Two first limiting portions arranged at intervals along the first direction are provided in the first channel, and the first piston member is configured to be able to move in the area defined between the two first limiting portions; two second limiting portions arranged at intervals along the first direction are provided in the second channel, and the second piston member is configured to be able to move in the area defined between the two second limiting portions.

8. The falling ball type ink viscosity control device according to claim 7, characterized in that: The one-way valve is located below the second piston member, the second channel and the discharge channel are arranged to intersect vertically and form a cross structure together, and the two second limit portions are respectively located on both sides of the discharge channel along the first direction; and / or, The shell is provided with an air hole communicated with the exhaust channel, the air hole is connected to a pumping air pipe, and the pumping air pipe is provided with a control valve.

9. A control method for a falling ball type ink viscosity control device, characterized in that: Applied to the falling ball type ink viscosity control device according to claim 3, the control method comprises the following steps: Determine the current working mode; If the current working mode is the viscosity control mode, controlling the first electromagnet and the second electromagnet to be powered off; If the current working mode is the impurity removal mode, the second electromagnet is energized to move the second piston to the first position, so that the liquid inlet chamber and the discharge channel are connected and the one-way valve is opened; If the current working mode is switched from the impurity removal mode to the viscosity control mode, the second electromagnet is controlled to be de-energized so that the one-way valve closes automatically, and the first electromagnet is controlled to be energized so that the second piston moves to the second position, so that the liquid inlet chamber and the discharge channel are isolated from each other.

10. A control method for a falling ball type ink viscosity control device, characterized in that: Applied to the falling ball type ink viscosity control device according to claim 6, the control method comprises the following steps: When the liquid inlet valve assembly is closed and the induction component located on the upper side does not generate an electrical signal within a first set time, the second electromagnet is controlled to be continuously energized for a second set time, so that the second piston is located in the first position, the liquid inlet chamber is connected to the discharge channel, and the one-way valve is opened; After the second electromagnet is continuously energized for the second set time, the second electromagnet is controlled to be de-energized to close the one-way valve, and the first electromagnet is controlled to be continuously energized for a third set time to position the second piston member in the second position, so that the liquid inlet chamber and the discharge channel are not connected to each other.

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