Drop ball type ink viscosity control device and control method thereof

Abstract

The application discloses a falling ball type ink viscosity control device and a control method thereof, and belongs to the technical field of ink viscosity control. An overflow channel, a first channel and a second channel extend along a first direction, and a liquid outlet channel and a discharge channel extending upward and downward are arranged on both sides of the overflow cavity above the liquid inlet cavity along the first direction. The overflow channel is connected with the upper end of the liquid outlet channel and the overflow cavity, the first channel is connected with the upper end of the discharge channel and the overflow cavity, and a first piston is arranged in the first channel. The second channel is connected with the liquid inlet cavity and the discharge channel, and a second piston is arranged in the second channel. A liquid inlet valve assembly controls the opening and closing of the liquid inlet of the liquid inlet cavity. A measuring tube is connected with the liquid inlet cavity and the overflow cavity. Two electromagnets magnetically attract and drive the second piston to move to a first position or a second position to control the connection and disconnection of the liquid inlet cavity and the discharge channel, and magnetically attract and drive a one-way valve at the lower end of the discharge channel to open when the liquid inlet cavity and the discharge channel are connected. The application solves the problems that the measuring tube is easily damaged due to water hammer effect and the measuring ball is stuck due to ink impurities.

Description

Technical Field

[0001] This invention belongs to the field of ink viscosity control technology, and specifically relates to a falling ball type ink viscosity control device and its control method. Background Technology

[0002] Ink is a crucial raw material in the printing industry, and its viscosity is a vital technical parameter for stable printing in printing equipment. Because ink is prone to volatility and sedimentation due to gravity during use, its viscosity can increase, making it unsuitable for printing requirements and resulting in reduced print quality. Therefore, detecting and controlling ink viscosity is essential, and it is highly necessary to equip printing equipment with devices for measuring and adjusting ink viscosity to ensure that the viscosity meets the set printing requirements after measurement and adjustment.

[0003] Currently, most ink viscosity control devices are drop-ball type. When using a drop-ball type ink viscosity control device, a pneumatic diaphragm pump pumps ink to the device, causing it to continuously flow in from the bottom of the measuring tube and push the measuring ball upwards until it reaches the top. At this point, ink overflows from the pipe at the top of the measuring tube, completely replacing the existing ink. To measure the ink viscosity, the measuring ball falls at a constant speed. Two sensing components obtain the time it takes for the ball to travel a set height, calculating the ball's speed. Stokes' law is then used to derive the ink viscosity data. Finally, an appropriate solvent is added to the measuring tube to reduce the ink viscosity, adjusting it to the required level.

[0004] However, during the use of ink viscosity control devices, the rapid start-up or shutdown of the pneumatic diaphragm pump and inlet valve can cause water hammer, making the measuring tube susceptible to damage and increasing the maintenance frequency and cost of the ink viscosity control device. 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] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a falling ball type ink viscosity control device and its control method, which can solve the problems of the measuring tube being easily damaged by water hammer effect and the measuring ball being stuck due to ink impurities.

[0006] According to a first aspect of the present invention, a ball-drop type ink viscosity control device includes:

[0007] The housing includes an inlet chamber, an overflow chamber, an overflow channel, an outlet channel, a first channel, a second channel, and a discharge channel. The overflow chamber is located above the inlet chamber. The overflow channel, the first channel, and the second channel all extend along a first direction. The outlet channel and the discharge channel both extend in a vertical direction and are located on opposite sides of the overflow chamber along the first direction. The two ends of the overflow channel are connected to the upper ends of the overflow chamber and the outlet channel, respectively. The two ends of the first channel are connected to the upper ends of the overflow chamber and the discharge channel, respectively. The two ends of the second channel are connected to the inlet chamber and the discharge channel, respectively.

[0008] The liquid inlet valve assembly is used to control the opening and closing of the liquid inlet of the liquid inlet chamber;

[0009] A viscosity measuring assembly includes a measuring tube extending in a vertical direction, with both ends of the measuring tube connected to the liquid inlet chamber and the overflow chamber, respectively.

[0010] A one-way valve is located at the lower end of the discharge channel and is normally closed.

[0011] The first piston is slidably disposed within the first channel;

[0012] The second piston is slidably disposed within the second channel;

[0013] Two electromagnets are respectively disposed on both sides of the second channel along the first direction, and are used to magnetically drive the second piston to move to the first position or the second position to control the connection and disconnection between the liquid inlet chamber and the discharge channel, and 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.

[0014] According to the first aspect of the present invention, the falling ball type ink viscosity control device has at least the following beneficial effects: before measuring ink viscosity, it is necessary to close the inlet valve assembly and the existing pneumatic diaphragm pump to keep the ink in the measuring tube static and ensure measurement accuracy; before pumping ink to the measuring tube, it is necessary to open the inlet valve assembly and the pneumatic diaphragm pump; when the pneumatic diaphragm pump and the inlet valve assembly are quickly started or closed, a negative water hammer effect will be generated in the inlet chamber, the measuring tube and the overflow chamber. At this time, the one-way valve is closed, and the discharge channel, the part connected to the first channel and the discharge channel and the part connected to the second channel and the discharge channel are all in an airtight state. The first piston in the first channel and the second piston 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 easily breaking due to the water hammer effect.

[0015] Furthermore, when impurities in the ink within the measuring tube cause the measuring ball to become stuck and unable to fall, the viscosity measuring component cannot measure the viscosity of the ink. In this case, the electromagnet located on the side of the second channel away from the inlet chamber along the first direction is energized, causing it to magnetically attract the second piston, which moves it to the first position along the first direction away from the inlet chamber. This connects the inlet chamber, the second channel, and the discharge channel. Simultaneously, the electromagnet also magnetically attracts the one-way valve, causing it to switch from a closed state to an open state, thus opening the discharge channel to the outside. This allows the ink and impurities in the measuring tube to be discharged through the one-way valve, effectively removing impurities from the ink and preventing the measuring ball from becoming stuck again, thus ensuring the ink viscosity measurement is completed.

[0016] In some embodiments of the present invention, the second piston member is provided with an iron core inside. The electromagnet member located on the side of the second channel closer to the liquid inlet chamber along the first direction is designated 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 designated 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 also used to magnetically attract the valve core of the one-way valve to drive the one-way valve to switch to the open state.

[0017] In some embodiments of the present invention, the falling ball type ink viscosity control device further includes a control device, the falling ball type ink viscosity control device having an impurity removal mode and a viscosity adjustment mode, the control device being used to control the second electromagnet to be energized when the impurity removal mode is turned on, and to control the first electromagnet to be energized when the impurity removal mode is turned off.

[0018] In some embodiments of the present invention, the viscosity measuring assembly further includes a measuring ball and two sensing components. The measuring ball is disposed inside the measuring tube and can move in the vertical direction inside the measuring tube. The two sensing components are spaced apart in the vertical direction and located between the liquid inlet chamber and the overflow chamber. Each sensing component is disposed outside the measuring tube and is configured to be triggered by the measuring ball to generate an electrical signal.

[0019] In some embodiments of the present invention, the control device is electrically connected to the liquid inlet valve assembly, the second electromagnet and the sensing 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 sensing component located on the upper side does not generate an electrical signal within a first set time.

[0020] In some embodiments of the present invention, the control device is also electrically connected to the first electromagnet, and the control device is also used to control the second electromagnet to be de-energized after the second electromagnet has been continuously energized for a second set time, and to control the first electromagnet to be continuously energized for a third set time.

[0021] In some embodiments of the present invention, the first channel is provided with two spaced-apart first limiting portions along a first direction, and the first piston is configured to move within a region defined between the two first limiting portions; the second channel is provided with two spaced-apart second limiting portions along a first direction, and the second piston is configured to move within a region defined between the two second limiting portions.

[0022] 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 perpendicularly to each other and together form a cross structure, and the two second limiting portions are respectively located on both sides of the discharge channel along the first direction; and / or,

[0023] The housing is provided with an air hole that communicates with the discharge channel, the air hole is connected to a gas extraction pipe, and the gas extraction pipe is provided with a control valve.

[0024] A control method for a falling ball type ink viscosity control device according to a second aspect embodiment of the present invention, applied to a falling ball type ink viscosity control device as described in the first aspect embodiment, the control method comprising the following steps:

[0025] Determine the current working mode;

[0026] If the current working mode is viscosity control mode, control the first electromagnet and the second electromagnet to de-energize.

[0027] If the current working mode is the impurity removal mode, control the second electromagnet to be energized so that the second piston moves to the first position, connecting the liquid inlet chamber and the discharge channel, and opening the one-way valve;

[0028] If the current working mode is switched from the impurity removal mode to the viscosity control mode, the second electromagnet is de-energized to allow the one-way valve to close automatically, and the first electromagnet is energized to move the second piston to the second position, thereby isolating the inlet chamber and the outlet channel from each other.

[0029] The control method of the falling ball type ink viscosity control device according to the second aspect of the present invention has at least the following beneficial effects: when the user sets the current working mode of the falling ball type ink viscosity control device to viscosity adjustment mode, the first electromagnet and the second electromagnet are de-energized, 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 impurity removal mode, the second electromagnet is energized and generates a magnetic field, which can generate a magnetic attraction effect on the second piston and the one-way valve, causing the second piston to move to the first position along the first direction under the magnetic action, so that the liquid inlet chamber is connected to the discharge channel, so that the ink and impurities in the measuring tube can be discharged to the outside through the one-way valve, thereby completing the impurity removal work and preventing the measuring ball from being stuck by impurities and unable to continue the ink viscosity measurement work.

[0030] After the impurity removal is completed, the user switches the current operating mode of the ball-type ink viscosity control device to the viscosity adjustment mode, de-energizes the second electromagnet to release its magnetic attraction to the second piston and the one-way valve, causing the discharge channel to close automatically and become isolated from the outside. Meanwhile, the first electromagnet is energized to generate a magnetic field, which magnetically drives the second piston, causing it to move along the first direction towards the inlet chamber to the second position. This ensures that the inlet chamber and the discharge channel are not connected, preventing ink from being discharged through the inlet chamber and discharge channel during ink viscosity adjustment, thus ensuring that ink viscosity control can proceed.

[0031] A control method for a falling ball type ink viscosity control device according to a third aspect embodiment of the present invention, applied to a falling ball type ink viscosity control device as described in the first aspect embodiment, the control method comprising the following steps:

[0032] When the inlet valve assembly is closed and the sensing 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, thereby opening the discharge channel in the inlet chamber and opening the one-way valve.

[0033] After the second electromagnet is continuously energized for the second set time, the second electromagnet is de-energized to close the one-way valve, and the first electromagnet is continuously energized for the third set time to position the second piston in the second position, so that the inlet chamber and the outlet channel are not connected to each other.

[0034] The control method of the falling ball type ink viscosity control device according to the third aspect of the present invention has 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 measurement work can be performed. At this time, the measuring ball in the measuring tube will fall at a constant speed, and the speed of the measuring ball is obtained by the time difference between the electrical signals generated by the two sensing components. Then, the viscosity data of the ink is calculated according to Stokes' law. If the sensing component located on the upper side is still not triggered by the measuring ball to generate an electrical signal within a first set time, it indicates that the measuring ball is stuck by impurities in the ink. Then, the second electromagnet is controlled to remain energized within a second set time, so that the second piston can move to the first position under the magnetic attraction drive. At the same time, the one-way valve is switched from the closed state to the open state under the magnetic attraction drive, so that the ink and impurities in the measuring tube can be discharged to the outside, which is convenient for subsequent ink viscosity measurement work to be completed using the measuring ball.

[0035] After the second electromagnet is continuously energized for a second set time, all the ink and impurities in the measuring tube are discharged. Then, the second electromagnet is de-energized, releasing the magnetic drive effect on the second piston and the one-way valve, causing the one-way valve to switch from the open state to the closed state. Meanwhile, the first electromagnet is continuously energized for a third set time, allowing the second piston to move to the second position under the magnetic drive effect. This enables the second piston to separate the inlet chamber from the outlet channel, preventing the ink pumped later from being discharged through the outlet channel, thus ensuring that the ink viscosity control can be performed.

[0036] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0038] Figure 1 This is a connection diagram of an existing ink viscosity control device in the viscosity regulation working state.

[0039] Figure 2 This is a schematic diagram of the internal structure of the ball-falling ink viscosity control device provided in the embodiment of the present invention when it is in viscosity control mode;

[0040] Figure 3 This is a schematic diagram of the internal structure of the ball-falling ink viscosity control device provided in the embodiment of the present invention when it is in the impurity removal mode;

[0041] Figure 4 This is a schematic diagram of the internal structure of the falling ball type ink viscosity control device provided in another embodiment of the present invention when it is in viscosity control mode;

[0042] Figure 5 This is a schematic diagram of the electrical connection between the control device, the first electromagnet, and the second electromagnet in the falling ball type ink viscosity control device provided in the embodiment of the present invention.

[0043] Figure 6 This is a schematic diagram of the electrical connections of the control device, the first electromagnet, the second electromagnet, the liquid inlet valve assembly, and the first sensing component in a falling ball type ink viscosity control device provided in another embodiment of the present invention.

[0044] Figure 7 This is a schematic diagram of the control method of the falling ball type ink viscosity control device provided in the embodiment of the present invention;

[0045] Figure 8 This is a schematic diagram of the control method of the falling ball type ink viscosity control device provided in another embodiment of the present invention.

[0046] The following labels are used in the attached diagram: 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 connector; 131, First channel; 132, Discharge channel; 133, Air vent; 134, Second channel; 141, First electromagnet; 142, Second electromagnet; 143, Second piston; 144, Iron core; 145, First piston; 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 tank; 400, Heating device; 500, Pneumatic diaphragm pump; 600, Ink basin; 700, Ink bucket. Detailed Implementation

[0047] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0048] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0049] In the description of this invention, the use of terms such as "a number" means one or more, with "more than" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while terms like "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the number of indicated technical features, or the sequential relationship between indicated technical features.

[0050] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0051] Reference Figures 1 to 8 The following are several embodiments of the falling ball type ink viscosity control device and control method of the present invention.

[0052] like Figures 1 to 6 As shown, the ball-type ink viscosity control device 100 provided according to the first aspect embodiment of the present invention can be used as a supporting device in printing equipment, mainly to measure and adjust the viscosity of the ink in the ink tank 700, thereby ensuring the high quality of ink printing and inkjet printing in the printing equipment.

[0053] like Figure 1 As shown, when existing printing equipment is equipped with the falling ball ink viscosity control device 100 of this embodiment, the pneumatic diaphragm pump 500 is connected to the ink tank 700 and the ink basin 600 via pipelines to transport the ink in the ink tank 700 to the ink basin 600 for use by the printing equipment. The ink basin 600 is connected to the ink tank 700 via an overflow pipeline to return the overflowing ink to the ink tank 700. The pneumatic diaphragm pump 500 is also connected to the heating device 400 via a pipeline. 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, ink at a certain temperature is transported to the falling ball ink viscosity control device 100 for ink measurement and control.

[0054] Furthermore, the solvent tank 300 has a cavity for containing solvent. A delivery pump is connected via pipelines to both the solvent tank 300 and the solvent inlet of the falling-ball ink viscosity control device 100. The pump delivers solvent to the falling-ball ink viscosity control device 100 to reduce ink viscosity by replenishing the solvent. The ink outlet of the falling-ball ink viscosity control device 100 is connected via pipelines to the ink tank 700 to deliver the regulated ink to the ink tank 700, ensuring that the ink viscosity in the ink tank 700 meets printing requirements. Additionally, 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 status.

[0055] The falling ball type ink viscosity control device 100 has a first direction and a vertical direction, wherein the first direction is perpendicular to the vertical direction. In this embodiment, it is assumed that the first direction is the left-right direction.

[0056] like Figures 2 to 6 As shown, the falling ball type ink viscosity control device 100 includes a housing 171, an inlet valve assembly, a viscosity measuring assembly, a one-way valve 150, a first piston 145, a second piston 143, and an electromagnet.

[0057] The housing 171 has a hollow interior forming an inlet chamber 121 and an overflow chamber 123. The housing 171 also includes an overflow channel 124, an outlet channel 125, a first channel 131, a second channel 134, and a discharge channel 132. The overflow chamber 123 is located above the inlet chamber 121, and the overflow chamber 123 and the inlet chamber 121 are arranged vertically opposite each other. The overflow channel 124, the first channel 131, and the second channel 134 all extend along a first direction. The outlet channel 125 and the discharge channel 132 both extend vertically. Furthermore, the outlet channel 125 and the discharge channel 132 are located on opposite sides of the overflow chamber 123 along the first direction, meaning the overflow chamber 123 is situated between the outlet channel 125 and the discharge channel 132. The overflow channel 124 is connected to the upper ends of the overflow chamber 123 and the liquid outlet channel 125 at both ends along the first direction, the first channel 131 is connected to the upper ends of the overflow chamber 123 and the discharge channel 132 at both ends along the first direction, and the second channel 134 is connected to the liquid inlet chamber 121 and the discharge channel 132 at both ends along the first direction.

[0058] It is understood that the specific shapes of the inlet chamber 121 and the overflow chamber 123 are not limited and can be set according to actual design requirements. The inlet chamber 121 can contain solvent and ink to be measured. One side of the inlet chamber 121 in the horizontal direction is provided with an inlet port 122. The inlet port 122 can be connected to the solvent inlet and the ink inlet through different pipelines, so that a certain amount of ink and a certain amount of solvent can enter the inlet chamber 121. In this embodiment, the overflow channel 124, the outlet channel 125, the first channel 131, the second channel 134, and the discharge channel 132 are channels with a circular cross-sectional shape. The lower end of the liquid outlet channel 125 penetrates the lower surface of the housing 171. The lower end of the liquid outlet channel 125 is the ink outlet. A pipe connector 126 is provided at the ink outlet. The pipe connector 126 is detachably connected to the housing 171. The pipe connector 126 can be connected to one end of the return pipe. The other end of the return pipe is connected to the ink tank 700 so that the ink in the ball-type ink viscosity control device 100 can flow back to the ink tank 700.

[0059] The function of the inlet valve assembly is to control the opening and closing of the inlet port 122 of the inlet chamber 121. When the inlet valve assembly is closed, neither ink nor solvent can enter the inlet chamber 121. When the inlet valve assembly is open, ink and solvent can flow into the inlet chamber 121. It can be understood that the inlet valve assembly may include two electrically operated valves, respectively corresponding to the solvent inlet and the ink inlet, thereby controlling the flow rate of ink and solvent into the inlet chamber 121.

[0060] The viscosity measuring component is used to measure the viscosity of the ink. The component includes a measuring tube 111, which extends vertically. The upper and lower ends of the measuring tube 111 are connected to the inlet chamber 121 and the overflow chamber 123, respectively. Therefore, as ink continuously flows into the inlet chamber 121, the ink in the inlet chamber 121 flows upwards and sequentially through the measuring tube 111 and the overflow chamber 123, then flows out through the overflow channel 124 and the outlet channel 125, finally returning to the ink container 700. In this embodiment, the measuring tube 111 is a thin-walled circular tube.

[0061] Furthermore, the viscosity measurement assembly also includes a measuring ball 112 and two sensing elements 113. The measuring ball 112 is disposed inside the measuring tube 111 and is capable of vertical movement 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. The measuring ball 112 moves vertically within the inner cavity of the measuring tube 111, and there is a certain gap 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, several fluid passages can be provided at both the upper and lower ends of the measuring tube 111. Ink flowing into the measuring tube 111 can push the measuring ball 112 upwards until it reaches its designated position within the measuring tube 111, and the ink can then flow from the measuring tube 111 into the overflow chamber 123.

[0062] Two sensing elements 113 are arranged at a certain interval along the vertical direction, and the two sensing elements 113 are located between the liquid inlet chamber 121 and the overflow chamber 123. The vertical distance between the two sensing elements 113 is less than the length of the measuring tube 111. Each sensing element 113 is located on the outside of the measuring tube 111, and the sensing element 113 is configured to be triggered by the measuring ball 112 to generate an electrical signal.

[0063] It is understood that the measuring tube 111 and the two sensing components 113 are all fixedly installed within the receiving cavity of the housing 171. The sensing component 113 detects the height position of the measuring ball 112 through non-contact sensing. Specifically, when the measuring ball 112 passes 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 calculated by acquiring the time difference between the electrical signals generated by the two sensing components 113 and applying Stokes' law. The viscosity measurement assembly is prior art, and those skilled in the art should clearly understand its specific structure and working principle; further explanation is not provided here.

[0064] The one-way valve 150 is located at the lower end of the discharge channel 132, which penetrates the lower surface of the housing 171. The one-way valve 150 is detachably connected to the housing 171, and the one-way valve 150 is normally closed.

[0065] Understandably, in some examples, the check valve 150 uses a swing-driven valve core, which swings downwards under gravity to close the check valve 150, such as... Figure 2 and Figure 3As shown. In other examples, the check valve 150 uses a spring-driven valve core, which moves downward under the force of the spring, thus closing the check valve 150, as shown. Figure 4 As shown. A pipe can be connected to the lower end of the check valve 150 to discharge the liquid flowing from the check valve 150 to a set location. Alternatively, a container can be used to collect the liquid flowing from the check valve 150. External air pressure cannot drive the check valve 150 from the closed state to the open state; therefore, the check valve 150 remains in the closed state.

[0066] The first piston 145 is slidably disposed within the first channel 131, allowing it to move linearly along a first direction within the channel 131. The outer circumferential surface of the first piston 145 is fitted against the inner circumferential surface of the first channel 131, enabling the first piston 145 to provide excellent sealing and dividing the first channel 131 into two parts. The first piston 145 may be made of rubber.

[0067] The second piston 143 is slidably disposed within the second channel 134, allowing it to move linearly along a second direction within the channel 134. The outer circumferential surface of the second piston 143 is fitted against the inner circumferential surface of the second channel 134, enabling it to provide excellent sealing and dividing the second channel 134 into two parts. The second piston 143 may be made of rubber, and it contains an iron core 144 that moves along with the piston.

[0068] Two electromagnets are provided, arranged at intervals along a first direction, and respectively located on both sides of the second channel 134 along the first direction. In this embodiment, one electromagnet is located on the side of the liquid outlet channel 125 away from the liquid inlet chamber 121 along the first direction, and the other electromagnet is located on the side of the discharge channel 132 away from the liquid inlet chamber 121 along the first direction. The two electromagnets are arranged opposite to each other along the first direction. The housing 171 has a mounting cavity for accommodating the electromagnets. The electromagnets can generate a magnetic field when energized, but cannot generate a magnetic field when de-energized.

[0069] Furthermore, the two electromagnets can be used to magnetically drive the second piston 143 to move to the first or second position to control the connection between the liquid inlet chamber 121 and the discharge channel 132, and can also 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.

[0070] Specifically, the electromagnet located on the side of the second channel 134 near the liquid inlet chamber 121 along the first direction is designated as the first electromagnet 141. In this embodiment, the first electromagnet 141 is located on the side of the liquid outlet channel 125 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 143, thereby driving the second piston 143 to move to the second position within the second channel 134 along the first direction. This prevents the liquid inlet chamber 121 and the discharge channel 132 from communicating due to the separation and sealing effect of the second piston 143.

[0071] The electromagnet located on the side of the second channel 134 away from the liquid inlet chamber 121 along the first direction is designated as the 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 apply a magnetic attraction to the iron core 144 in the second piston 143, so as to drive the second piston 143 to move to a first position in the second channel 134 along the first direction, thereby enabling communication between the liquid inlet chamber 121 and the discharge channel 132. At this time, the second piston 143 cannot perform the function of separation and sealing. Furthermore, the second electromagnet 142 can also be used to magnetically attract the valve core of the one-way valve 150, so as to drive the one-way valve 150 to switch to the open state.

[0072] It is understandable that since the one-way valve 150 is normally closed, the valve core of the one-way valve 150 is magnetic and can be activated by magnetic attraction. Therefore, when the second electromagnet 142 is energized, the valve core of the one-way valve 150 can be activated by the magnetic field generated by the second electromagnet 142, causing the one-way valve 150 to be opened, so that the discharge channel 132 can be connected to the outside.

[0073] In some examples, such as Figures 2 to 4 As shown, the second piston 143 has guide portions at both ends along the first direction, and these guide portions can be chamfered. Furthermore, the one-way valve 150 is located below the second piston 143, and the second channel 134 is perpendicularly intersecting the discharge channel 132, causing the second channel 134 and the discharge channel 132 to together form a cross structure. The first position is located on the side of the discharge channel 132 away from the inlet chamber 121 along the first direction, and the second position is located on the side of the discharge channel 132 closer to the inlet chamber 121 along the first direction. The dimension (i.e., length) of the second piston 143 along the first direction is larger than the dimension (i.e., inner diameter) of the discharge channel 132 along the first direction; therefore, the second piston 143 can move along the first direction and move back and forth between the first and second positions.

[0074] When the second piston 143 moves to the first position, the end of the second piston 143 near the liquid inlet chamber 121 along the first direction is located at the first position or inside the discharge channel 132, causing the inside 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. Therefore, when the liquid supply to the liquid inlet chamber 121 is stopped, the ink in the measuring tube 111 can flow through the inside 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.

[0075] Of course, in other examples, the second piston 143 may have several L-shaped discharge holes. One end of each discharge hole penetrates the end face of the second piston 143 along the first direction near the inlet chamber 121, and the other end penetrates the outer peripheral surface of the second piston 143. The second channel 134 and the discharge channel 132 are perpendicularly connected and together form a T-shaped structure. When the second piston 143 moves to the first position, the end of the second piston 143 away from the inlet chamber 121 along the first direction is located in the discharge channel 132. At this time, the discharge hole connects the second channel 134 and the discharge channel 132, so the liquid in the inlet chamber 121 can flow to the discharge channel 132 through the discharge hole. When the entire outer peripheral surface of the second piston 143 is fitted with the inner peripheral surface of the second channel 134, one end of the discharge hole is closed, and the liquid in the inlet chamber 121 cannot flow into the discharge channel 132 through the discharge hole.

[0076] During the use of the falling ball type ink viscosity control device 100 provided in this embodiment of the invention, before measuring the ink viscosity, it is necessary to close the inlet valve assembly and the pneumatic diaphragm pump 500 to stop the supply of ink or solvent to the inlet chamber 121, so that the ink in the measuring tube 111 can remain static, thus ensuring good accuracy of ink viscosity measurement. Before pumping the ink in the ink tank 700 to the inlet chamber 121, it is necessary to open the inlet valve assembly and the pneumatic diaphragm pump 500 so that the ink can flow into the inlet chamber 121.

[0077] When the pneumatic diaphragm pump 500 and the inlet valve assembly are rapidly started or stopped, a certain amount of negative water hammer will be generated in the inlet chamber 121, the measuring tube 111, and the overflow chamber 123, which may damage the measuring tube 111. At this time, since the one-way valve 150 is in the closed state, the discharge channel 132, the part connecting the first channel 131 and the discharge channel 132, and the part connecting the second channel 134 and the discharge channel 132 are all in an airtight state (i.e., there is a certain air pressure). Therefore, under the influence of air pressure and negative water hammer, the first piston 145 in the first channel 131 and the second piston 143 in the second channel 134 will move in the first direction to absorb the water hammer impact energy, reduce the pressure fluctuation amplitude, thereby effectively weakening the water hammer pressure fluctuation, effectively preventing the measuring tube 111 from easily breaking 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 in the housing 171 needs to be disassembled and replaced, and reducing maintenance costs.

[0078] Furthermore, when impurities in the ink within the measuring tube 111 cause the measuring ball 112 to become stuck and unable to fall, the viscosity measuring component cannot perform viscosity measurement on the ink. In this case, the electromagnet (i.e., the second electromagnet 142) located on the side of the second channel 134 away from the liquid inlet chamber 121 along the first direction is energized, causing the electromagnet to magnetically attract the second piston 143, driving the second piston 143 to move along the first direction away from the liquid inlet chamber 121 to the first position. This connects 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, causing it to switch from a closed state to an open state, thus opening the discharge channel 132 to the outside. This allows the ink in the measuring tube 111 to be discharged through the one-way valve 150, effectively and automatically removing impurities from the ink. This prevents the measuring ball 112 from becoming stuck again and being unable to complete the ink viscosity measurement, reduces operational difficulty, and improves automation.

[0079] Understandably, when discharging ink and impurities from the measuring tube 111, the first piston 145 can move in the first direction under the action of the pressure difference.

[0080] In some embodiments, the falling ball type ink viscosity control device 100 further includes a control device 200. The control device 200 can be integrated with the housing 171 or designed separately from it. The control device 200 can be a host computer or a touch control display screen, etc. The falling ball type ink viscosity control device 100 has an impurity removal mode and a viscosity adjustment mode. The control device 200 is used to control the second electromagnet 142 to be energized when the impurity removal mode is activated, and to control the first electromagnet 141 to be energized when the impurity removal mode is deactivated.

[0081] Understandably, when the user operates the control device 200 to activate the impurity removal mode of the falling ball ink viscosity control device 100, the control device 200 can generate a control command to energize the second electromagnet 142, 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.

[0082] When the user closes the impurity removal mode via the control device 200, the second electromagnet 142 is de-energized under the control command of the control device 200, and the magnetic field generated by the second electromagnet 142 disappears. Therefore, the one-way valve 150 automatically switches from the open state to the closed state. Simultaneously, the first electromagnet 141 is energized and generates a magnetic field. Under the influence of the magnetic field generated by the first electromagnet 141, the second piston 143 moves along the first direction to the second position, causing the second piston 143 to reset. When the viscosity control mode is activated, during the ink delivery process in the liquid inlet chamber 121, the first piston 145 and the second piston 143 move along the first direction due to the pressure of the ink and the air pressure in the discharge channel 132 to achieve a force balance.

[0083] In some embodiments, the control device 200 is electrically connected to the inlet valve assembly, the second electromagnet 142, and the upper sensing component 113 via circuits, respectively. The upper sensing component 113 is designated as the first sensing component. Thus, the control device 200 can transmit signals to the inlet valve assembly, the second electromagnet 142, and the first sensing component. Furthermore, the control device 200 can also control the second electromagnet 142 to remain energized for a second set time when the 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.

[0084] Understandably, the first and second set times can be set according to actual conditions, such as by calculating them through multiple experiments. When the inlet valve assembly is closed, the ink delivery stops, and the measuring ball 112 in the measuring tube 111 begins to fall. If the measuring ball 112 fails to fall and trigger the upper sensing component 113 within the first set time, it indicates that the falling process of the measuring ball 112 is obstructed, and it is necessary to discharge the ink and impurities in the measuring tube 111. During the impurity removal process, the second electromagnet 142 is energized within the second set time to ensure that the second piston 143 moves to the first position and that the ink and impurities in the measuring tube 111 have been completely discharged.

[0085] Of course, it is not excluded that in other embodiments, a flow sensor is installed at the lower end of the one-way valve 150 or on the outflow pipe connected to the one-way valve 150. When the flow sensor detects that no liquid flows out from the one-way valve 150, it indicates that the outflow work is completed. At this time, the second electromagnet 142 can be switched from the energized state to the de-energized state.

[0086] With this setting, it is possible to automatically identify whether the measuring ball 112 inside the measuring tube 111 is stuck, and automatically control the ink and impurities inside the measuring tube 111 to be discharged outward, thereby improving the automation level of the falling ball type ink viscosity control device 100.

[0087] Furthermore, the control device 200 can also be electrically connected to the first electromagnet 141 via a circuit. The control device 200 is also used to de-energize the second electromagnet 142 after it has been continuously energized for a second set time, and to control the first electromagnet 141 to be continuously energized for a third set time.

[0088] Understandably, after the second electromagnet 142 has been energized for a second set time, the ink and impurities in the measuring tube 111 have been completely discharged. At this time, the second electromagnet 142 can be de-energized and stop working. At the same time, the first electromagnet 141 can be energized and continuously energized for a third set time, causing the second piston 143 to move to the second position in the second channel 134, ensuring that the second piston 143 automatically resets.

[0089] In some embodiments, two first limiting portions are provided in the first channel 131 along a first direction. 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. 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.

[0090] In this embodiment, as 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 away from the overflow cavity 123 in the first direction passes through the side of the housing 171 to form a first opening. The first piston 145 can be placed in the first channel 131 through the first opening, the overflow channel 124, and the overflow cavity 123. A removable first plug 172 is provided at the first opening.

[0091] 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 this second opening. The lower end of the second sealing plug 162 extends downward and forms a first limiting portion, which restricts the distance the first piston 145 can move towards the overflow chamber 123. Furthermore, the inner circumferential surface of the first channel 131 protrudes along the first direction away from the overflow chamber 123 to form another first limiting portion. This first limiting portion is annular and restricts the distance the first piston 145 can move towards the discharge channel 132.

[0092] In some embodiments, two second limiting portions are provided in the second channel 134 along the first direction. 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. 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.

[0093] In this embodiment, as Figures 2 to 4 As shown, the second channel 134 and the discharge channel 132 are perpendicularly intersecting each other, forming a cross structure. The end of the second channel 134 away from the inlet chamber 121 along the first direction penetrates the side of the housing 171 to form a third opening. The second piston 143 can be inserted into the second channel 134 through the third opening. A removable second plug 173 is provided at the third opening. Two second limiting portions are 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 inlet chamber 121 extends downwards through the lower surface of the housing 171 to form a fourth opening. The fourth opening is threadedly connected to a first sealing plug 161. The upper end of the first sealing plug 161 extends upwards and forms another second limiting portion.

[0094] In some embodiments, such as Figures 2 to 4 As shown, the housing 171 is provided with an air vent 133, which is connected to the discharge channel 132. The air vent 133 is connected to a suction pipe, and a control valve is provided on the suction pipe. The control valve can be electrically connected to the control device 200.

[0095] Understandably, the gas extraction pipe can be connected to both the gas storage tank and the vacuum equipment via pipelines. The connection between the gas extraction pipe and the vent 133 is controlled by opening and closing a control valve. Gas is supplied to or extracted from the discharge channel 132 via the gas extraction pipe to control the gas pressure within the discharge channel 132. The gas can be an inert gas or air. The location of the vent 133 is not limited.

[0096] like Figures 1 to 5 , Figure 7As shown, the control method of the falling ball type ink viscosity control device 100 provided according to the second aspect embodiment of the present invention is applied to the falling ball type ink viscosity control device 100 as described in the first aspect embodiment. The control method includes the following steps:

[0097] Step S11: Determine the current working mode.

[0098] Step S12: If the current working mode is viscosity control mode, de-energize the first electromagnet 141 and the second electromagnet 142.

[0099] Step S13: If the current working mode is the impurity removal mode, control the second electromagnet 142 to be energized so that the second piston 143 moves 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.

[0100] Step S14: If the current working mode is switched from the impurity removal mode to the viscosity control mode, the second electromagnet 142 is de-energized to allow the one-way valve 150 to close automatically, and the first electromagnet 141 is energized to allow the second piston 143 to move to the second position, thereby isolating the liquid inlet chamber 121 and the discharge channel 132 from each other.

[0101] Understandably, when the user sets the current working mode of the falling ball ink viscosity control device 100 to viscosity adjustment mode, the first electromagnet 141 and the second electromagnet 142 are de-energized, 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 measuring component. When the user sets the current working mode of the falling ball ink viscosity control device 100 to impurity removal mode, the second electromagnet 142 is energized and generates a magnetic field, which can magnetically attract the second piston 143 and the one-way valve 150, causing the second piston 143 to move to the first position along the first direction under the magnetic action, so that the liquid inlet chamber 121 is 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 unable to continue the ink viscosity measurement work.

[0102] After the impurity removal is completed, the user switches the current working mode of the ball-type ink viscosity control device 100 to the viscosity adjustment mode, de-energizes the second electromagnet 142 to release its magnetic attraction effect on the second piston 143 and the one-way valve 150, causing the discharge channel 132 to close automatically due to the one-way valve 150 and become isolated from the outside. Meanwhile, the first electromagnet 141 is energized and generates a magnetic field to magnetically drive the second piston 143, causing it to move along the first direction toward the liquid inlet chamber 121 to the second position, thus preventing the liquid inlet chamber 121 and the discharge channel 132 from communicating with each other. This prevents ink from being discharged through the liquid inlet chamber 121 and the discharge channel 132 during the ink viscosity adjustment process, ensuring that the ink viscosity control can proceed.

[0103] 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 according to the third aspect embodiment of the present invention is applied to the falling ball type ink viscosity control device 100 as described in the first aspect embodiment. The control method includes the following steps:

[0104] Step S21: When the inlet valve assembly is closed and the sensing component 113 located on the upper side does not generate an electrical signal within a first set time, control the second electromagnet 142 to be continuously energized for a second set time so that the second piston 143 is in the first position, causing the inlet chamber 121 to open the discharge channel 132 and causing the one-way valve 150 to open.

[0105] Step S22: After the second electromagnet 142 is continuously energized for a second set time, the second electromagnet 142 is de-energized to close the one-way valve 150, and the first electromagnet 141 is continuously energized for a third set time to position the second piston 143 in the second position, so that the liquid inlet chamber 121 and the discharge channel 132 are not connected to each other.

[0106] Understandably, when the inlet valve assembly is closed and the ink input to the measuring tube 111 is stopped, the ink viscosity measurement can be performed. At this time, the measuring ball 112 in the measuring tube 111 will fall at a constant speed, and the speed of the measuring ball 112 is obtained by the time difference between the electrical signals generated by the two sensing components 113. Then, the viscosity data of the ink is calculated according to Stokes' law. If the sensing component 113 on the upper side is still not 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 within the second set time, so that the second piston 143 can move to the first position under the magnetic attraction. At the same time, the one-way valve 150 is switched from the closed state to the open state under the 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.

[0107] After the second electromagnet 142 is continuously energized for a second set time, all the ink and impurities in the measuring tube 111 are discharged. Then, the second electromagnet 142 is de-energized, releasing the magnetic drive effect on the second piston 143 and the one-way valve 150, causing the one-way valve 150 to switch from the open state to the closed state. Meanwhile, the first electromagnet 141 is continuously energized for a third set time, allowing the second piston 143 to move to the second position under the magnetic drive effect. This enables the second piston 143 to separate the liquid inlet chamber 121 from the discharge channel 132, preventing the ink pumped later from being discharged through the discharge channel 132, thereby ensuring that the ink viscosity adjustment work can be carried out.

[0108] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A ball-drop type ink viscosity control device, characterized in that, include: The housing includes an inlet chamber, an overflow chamber, an overflow channel, an outlet channel, a first channel, a second channel, and a discharge channel. The overflow chamber is located above the inlet chamber. The overflow channel, the first channel, and the second channel all extend along a first direction. The outlet channel and the discharge channel both extend in a vertical direction and are located on opposite sides of the overflow chamber along the first direction. The two ends of the overflow channel are connected to the upper ends of the overflow chamber and the outlet channel, respectively. The two ends of the first channel are connected to the upper ends of the overflow chamber and the discharge channel, respectively. The two ends of the second channel are connected to the inlet chamber and the discharge channel, respectively. The liquid inlet valve assembly is used to control the opening and closing of the liquid inlet of the liquid inlet chamber; A viscosity measuring assembly includes a measuring tube extending in a vertical direction, with both ends of the measuring tube connected to the liquid inlet chamber and the overflow chamber, respectively. A one-way valve is located at the lower end of the discharge channel and is normally closed. The first piston is slidably disposed within the first channel; The second piston is slidably disposed within the second channel; Two electromagnets are respectively disposed on both sides of the second channel along the first direction, and are used to magnetically drive the second piston to move to the first position or the second position to control the connection and disconnection between the liquid inlet chamber and the liquid outlet channel, and to magnetically drive the one-way valve to open when the liquid inlet chamber and the liquid outlet channel are connected; the first direction is perpendicular to the up and down direction; The second piston has an internal iron core. The electromagnet located on the side of the second channel closer to the liquid inlet chamber along the first direction is designated as the first electromagnet. The first electromagnet is used to magnetically attract the iron core to drive the second piston to move to the second position, so that the liquid inlet chamber and the discharge channel are not connected. The electromagnet located on the side of the second channel away from the liquid inlet chamber along the first direction is designated as the second electromagnet. The second electromagnet is used to magnetically attract the iron core to drive the second piston to move to the first position, so that the liquid inlet chamber and the discharge channel are connected, and is also used to magnetically attract the valve core of the one-way valve to drive the one-way valve to switch to the open state. The falling ball type ink viscosity control device further includes a control device, which has an impurity removal mode and a viscosity adjustment mode. The control device is used to control the second electromagnet to be energized when the impurity removal mode is turned on, and to control the first electromagnet to be energized when the impurity removal mode is turned off. The viscosity measuring assembly further includes a measuring ball and two sensing components. The measuring ball is disposed inside the measuring tube and can move vertically within the measuring tube. The two sensing components are spaced apart vertically and located between the liquid inlet chamber and the overflow chamber. Each sensing component is disposed on the outside of the measuring tube and is configured to be triggered by the measuring ball to generate an electrical signal. The control device is electrically connected to the liquid inlet valve assembly, the second electromagnet, and the sensing component located on the upper side. 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 sensing component located on the upper side does not generate an electrical signal within a first set time.

2. The ball-feeding ink viscosity control device according to claim 1, characterized in that, The control device is also electrically connected to the first electromagnet, and the control device is also used to control the second electromagnet to be de-energized after the second electromagnet has been continuously energized for a second set time, and to control the first electromagnet to be continuously energized for a third set time.

3. The ball-feeding ink viscosity control device according to claim 1, characterized in that, The first channel has two spaced-apart first limiting portions arranged along a first direction, and the first piston is configured to move within a region defined between the two first limiting portions; the second channel has two spaced-apart second limiting portions arranged along a first direction, and the second piston is configured to move within a region defined between the two second limiting portions.

4. The ball-feeding ink viscosity control device according to claim 3, characterized in that, The one-way valve is located below the second piston member, the second channel intersects the discharge channel perpendicularly, and together they form a cross structure. The two second limiting parts are located on both sides of the discharge channel along the first direction; and / or, The housing is provided with an air hole that communicates with the discharge channel, the air hole is connected to a gas extraction pipe, and the gas extraction pipe is provided with a control valve.

5. A control method for a falling ball type ink viscosity control device, characterized in that, The control method, applied to the ball-feed ink viscosity control device as described in claim 1, comprises the following steps: Determine the current working mode; If the current working mode is viscosity control mode, control the first electromagnet and the second electromagnet to de-energize. If the current working mode is the impurity removal mode, control the second electromagnet to be energized so that the second piston moves to the first position, connecting the liquid inlet chamber and the discharge channel, and opening the one-way valve; If the current working mode is switched from the impurity removal mode to the viscosity control mode, the second electromagnet is de-energized to allow the one-way valve to close automatically, and the first electromagnet is energized to move the second piston to the second position, thereby isolating the inlet chamber and the outlet channel from each other.

6. A control method for a falling ball type ink viscosity control device, characterized in that, The control method, applied to the ball-feed ink viscosity control device as described in claim 2, comprises the following steps: When the inlet valve assembly is closed and the sensing 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, thereby opening the discharge channel in the inlet chamber and opening the one-way valve. After the second electromagnet is continuously energized for the second set time, the second electromagnet is de-energized to close the one-way valve, and the first electromagnet is continuously energized for the third set time to position the second piston in the second position, so that the inlet chamber and the outlet channel are not connected to each other.

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