A piezoelectric inkjet printhead device based on vibrating plate grooves

Abstract

This invention discloses a piezoelectric inkjet printhead device based on a vibrating plate groove, relating to the field of printer technology. It includes a printhead body with linearly arranged ink inlet and outlet ports at both ends. The printhead body also contains an internal circulation channel unit for ink circulation, on which a piezoelectric drive unit is installed. The printhead body also includes an ink replenishment mechanism, comprising an ink filling chamber with an ink filling tube connected to the ink cartridge, and an ink delivery tube. One end of the ink delivery tube is equipped with an ink volume detection sensor. During use, the ink volume detection sensor, a micro motor, an ink delivery wheel, and a directional limiting structure work together to automatically detect and quantitatively replenish the ink volume in the ink storage chamber without manual intervention, effectively compensating for insufficient ink intake due to ink quality degradation.

Description

Technical Field

[0001] This invention relates to the field of printer technology, and more specifically to a piezoelectric inkjet printhead device based on a vibrating plate groove. Background Technology

[0002] Inkjet printing technology, as a non-contact printing method, has been widely used in many fields such as industrial coding, large-format advertising, textile printing, high-precision commercial printing, and biomedicine due to its advantages such as high printing accuracy, wide applicability to various media, and low operating noise.

[0003] As a core component of inkjet printing devices, piezoelectric inkjet printheads operate based on the piezoelectric effect. Applying a specific voltage to a piezoelectric material causes minute mechanical deformation, altering the ink chamber volume and generating pressure pulses that propel ink droplets precisely out of the nozzle, completing the printing process. Compared to thermal inkjet printheads, piezoelectric printheads do not require ink heating, are compatible with various ink types including water-based, solvent-based, and UV-cured inks, and offer higher droplet control precision and longer print life, making them the preferred core component for current mid-to-high-end inkjet printing equipment.

[0004] During prolonged continuous use, the ink quality of traditional piezoelectric inkjet printheads is prone to decline, which can lead to the formation and retention of air bubbles in the ink supply system and ink chamber, resulting in insufficient ink intake and affecting print quality. Furthermore, the piezoelectric ceramic layer of traditional piezoelectric inkjet printheads is usually designed as a single plate, and the connection between the piezoelectric ceramic layer and components such as the vibrating plate and the fixed substrate is relatively tight, which leads to serious structural vibration crosstalk problems. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a piezoelectric inkjet printhead device based on a vibrating plate groove. The problem to be solved is that when the piezoelectric inkjet printhead is used continuously for a long time, the ink quality deteriorates, causing air bubbles to accumulate in the ink supply system and ink cavity, resulting in insufficient ink intake and affecting the printing effect. In addition, the structural vibration crosstalk problem caused by the integrated plate design of the piezoelectric ceramic layer of the traditional printhead being tightly connected to the vibrating plate and the fixed substrate is relatively serious.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a piezoelectric inkjet printhead device based on a vibrating plate groove, comprising a printhead body, wherein the two ends of the printhead body are respectively provided with linearly arranged ink inlet and ink outlet, the printhead body outputs and inputs ink from the ink cartridge through the ink inlet and ink outlet respectively, and the printhead body is also provided with an internal circulation channel unit for internal ink circulation, wherein a piezoelectric drive unit for generating pressure pulses is installed on the internal circulation channel unit, and one end of the printhead body is also provided with an ink replenishment mechanism for replenishing ink; The printhead body has an ink storage chamber and an ink return chamber, which are connected to the ink cartridge through an ink inlet and an ink outlet, respectively. Ink channels are arranged between the ink storage chamber and the ink return chamber, and the ink channels are connected to each other. Each ink channel corresponds to a piezoelectric drive unit.

[0008] As a preferred embodiment of the piezoelectric inkjet printhead device based on the vibration plate groove of the present invention, the ink replenishment mechanism includes an ink filling chamber fixedly installed on the printhead body, an ink filling tube connected to the ink cartridge on the ink filling chamber, an ink supply tube connected to the ink storage cavity on the ink filling chamber, and an ink quantity detection sensor is provided at one end of the ink supply tube extending into the ink storage cavity.

[0009] As a preferred embodiment of the piezoelectric inkjet printhead device based on the vibration plate groove of the present invention, wherein: an ink feeding wheel is rotatably connected to the ink filling chamber and is fitted with the ink filling chamber with a gap, and the ink feeding wheel is provided with an annular array of ink storage grooves, the included angle of the line connecting the ink storage grooves is ninety degrees.

[0010] As a preferred embodiment of the piezoelectric inkjet printhead device based on the vibration plate groove of the present invention, wherein: a protective cover is fixedly installed at one end of the ink filling chamber protruding from the printhead body, a guide shaft distributed in a ring array is slidably connected on the protective cover, a wedge-shaped slider is fixedly installed at one end of the guide shaft extending into the protective cover, and a return spring is sleeved on the outside of each wedge-shaped slider, and the two ends of the return spring are respectively connected to the wedge-shaped slider and the protective cover.

[0011] As a preferred embodiment of the piezoelectric inkjet printhead device based on the vibration plate groove of the present invention, wherein: a directional roller is rotatably connected in the protective cover, the directional roller is fixedly connected to the ink feeding roller through a rotating rod and is concentrically distributed with the protective cover and the ink filling chamber, the directional roller is also provided with a wedge groove adapted to the wedge slider, and the directional roller is also provided with a tension spring eccentrically arranged with the rotating rod on the directional roller.

[0012] As a preferred embodiment of the piezoelectric inkjet printhead device based on the vibration plate groove of the present invention, a micro motor is also fixedly installed outside the protective cover. A swing arm is fixedly installed at one end of the output shaft of the micro motor extending into the protective cover. One end of the swing arm is elastically connected to the directional wheel through a tension spring. The micro motor is also electrically connected to the ink volume detection sensor.

[0013] As a preferred embodiment of the piezoelectric inkjet printhead device based on the vibration plate groove of the present invention, wherein: the inner circulation channel unit is provided with an inlet main ink channel and an outlet main ink channel respectively connected to the ink storage chamber and the ink return chamber; the inlet main ink channel is also provided with a pressure chamber adapted to the piezoelectric drive unit; a first flow limiter is provided at the end of the inlet main ink channel near the pressure chamber; a second flow limiter is provided at the end of the outlet main ink channel near the pressure chamber; a nozzle is provided at the end of the pressure chamber away from the inlet main ink channel, and one end of the nozzle protrudes outside the printhead body.

[0014] As a preferred embodiment of the piezoelectric inkjet printhead device based on the grooved vibrating plate described in this invention, the piezoelectric driving unit includes a silicon substrate and a vibrating plate. The silicon substrate is linearly arranged along the length of the vibrating plate and is symmetrically distributed on both sides of the pressure chamber. A piezoelectric ceramic layer is provided on the vibrating plate, and an upper electrode layer and a lower electrode layer are respectively provided on both sides of the piezoelectric ceramic layer. The upper electrode layer is located between the vibrating plate and the piezoelectric ceramic layer.

[0015] As a preferred embodiment of the piezoelectric inkjet printhead device based on the vibration plate groove of the present invention, wherein: the vibration plate is further provided with cutting grooves that sequentially penetrate the lower electrode layer, the piezoelectric ceramic layer and the upper electrode layer, and the cutting grooves are respectively located between adjacent inner circulation channel units.

[0016] As a preferred embodiment of the piezoelectric inkjet printhead device based on the grooved vibrating plate described in this invention, the vibrating plate is a single-layer structure of silicon dioxide or a single-layer structure of silicon nitride.

[0017] In summary, the present invention has at least one of the following beneficial effects: 1. This invention achieves automatic detection and quantitative ink replenishment of the ink storage chamber through the coordinated operation of an ink volume detection sensor, a micro motor, an ink delivery wheel, and a directional limiting structure, without the need for manual intervention, effectively compensating for insufficient ink intake caused by a decline in ink quality.

[0018] 2. This invention constructs an ink recycling structure by setting up an ink storage chamber, an ink return chamber, an ink flow channel, an ink inlet, and an ink outlet, which can effectively avoid the quality degradation caused by long-term ink retention and reduce the retention of air bubbles in the ink supply system and inside the ink chamber.

[0019] 3. This invention breaks the traditional tightly connected design of integrated plate-like piezoelectric ceramic layers by setting cutting grooves through each electrode layer and piezoelectric ceramic layer on the vibration plate, thereby achieving vibration isolation between adjacent piezoelectric drive units. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional perspective view of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a cross-sectional view of the internal circulation channel unit of the present invention; Figure 5 This is a structural diagram of the piezoelectric drive unit of the present invention; Figure 6 This is a structural diagram showing the assembly of the ink filling chamber and the protective cover of the present invention. Figure 7 This is a structural diagram of the ink filling chamber and ink delivery wheel of the present invention. Figure 8 This is a structural diagram showing the assembly of the ink delivery roller and the protective cover of the present invention. Figure 9 This is a structural diagram showing the installation of the protective cover and the directional wheel according to the present invention. Figure 10 This is a structural diagram showing the installation of the ink feeding wheel and the directional wheel according to the present invention.

[0022] Explanation of reference numerals in the attached figures: 1. Printhead body; 11. Ink reservoir; 12. Ink return chamber; 13. Ink flow channel; 2. Ink inlet; 3. Ink outlet; 4. Internal circulation channel unit; 41. Main inlet ink channel; 411. First flow limiter; 42. Pressure chamber; 421. Nozzle; 43. Main outlet ink channel; 431. Second flow limiter; 5. Piezoelectric drive unit; 51. Silicon substrate; 52. Vibrating plate; 521. Cutting groove; 53. Piezoelectric ceramic layer; 531 532. Upper electrode layer; 6. Lower electrode layer; 6. Ink replenishment mechanism; 61. Ink filling chamber; 611. Ink filling tube; 612. Ink supply tube; 6121. Ink volume detection sensor; 62. Ink delivery roller; 621. Ink storage tank; 63. Protective cover; 631. Guide shaft; 632. Wedge slider; 6321. Return spring; 64. Orientation wheel; 641. Wedge groove; 642. Tension spring; 65. Micro motor; 651. Swing arm. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] This invention discloses a piezoelectric inkjet printhead device based on a vibrating plate groove. Example

[0025] Reference Figure 1-10This invention provides a piezoelectric inkjet printhead device based on a vibrating plate groove, comprising a printhead body 1. The printhead body 1 has linearly arranged ink inlet 2 and ink outlet 3 at both ends. The printhead body 1 outputs and inputs ink from the ink cartridge through the ink inlet 2 and ink outlet 3, respectively. An internal circulation channel unit 4 for internal ink circulation is also arranged within the printhead body 1. A piezoelectric drive unit 5 for generating pressure pulses is installed on the internal circulation channel unit 4. One end of the printhead body 1 also has an ink replenishment mechanism 6 for replenishing ink. The printhead body 1 has an ink storage chamber 11 and an ink return chamber 12, which are connected to the ink cartridge through the ink inlet 2 and ink outlet 3, respectively. An ink flow channel 13 is arranged between the ink storage chamber 11 and the ink return chamber 12, and the ink storage chamber 11 and the ink return chamber 12 are connected through the ink flow channel 13. The ink inlet 2 and ink outlet 3 are configured one-to-one with the piezoelectric drive unit 5. They can be precisely connected to the corresponding interfaces of the ink cartridge to achieve stable ink input and recycling. The ink inlet 2 is responsible for guiding the ink in the ink cartridge into the ink storage chamber 11, while the ink outlet 3 returns the unused ink in the ink return chamber 12 back to the ink cartridge, forming an ink recycling system. The arrangement density of the inner circulation channel unit 4 is matched with the printing precision. The piezoelectric drive unit 5 is installed correspondingly to the inner circulation channel unit 4, which can apply pressure pulses to the ink in each channel. The ink storage chamber 11 is used to temporarily store the ink to be ejected, which plays a role in stabilizing the ink supply pressure. The ink return chamber 12 is used to recycle the un-ejected ink to prevent the ink from stagnating and deteriorating in the channel. The ink channel 13 connects the ink storage chamber 11 and the ink return chamber 12 to form an ink circulation loop, and at the same time provides a carrier for the piezoelectric drive unit 5. The one-to-one correspondence ensures that each piezoelectric drive unit 5 only acts on the ink in the corresponding channel, avoiding mutual interference.

[0026] The ink replenishment mechanism 6 includes an ink filling chamber 61 fixedly mounted on the printhead body 1. The ink filling chamber 61 has an ink filling tube 611 connected to the ink cartridge, and an ink supply tube 612 connected to the ink storage chamber 11. An ink level detection sensor 6121 is located at one end of the ink supply tube 612 extending into the ink storage chamber 11. The ink filling chamber 61 adopts a sealed structure design to prevent ink leakage and air ingress. The ink filling tube 611 is used to guide ink from the ink cartridge into the ink filling chamber 61 for ink replenishment. The ink supply channel has a diameter adapted to the ink viscosity. The ink supply tube 612 is used to transport the ink in the ink filling chamber 61 to the ink storage chamber 11 to realize the ink replenishment action. The ink volume detection sensor 6121 adopts a contact detection method and can detect the ink level in the ink storage chamber 11 in real time. When the ink volume is lower than the preset threshold, the ink volume detection sensor 6121 sends an electrical signal to the control unit to trigger the ink replenishment action. When the ink volume reaches the preset upper limit, the ink replenishment stops. It is a conventional sensor in the existing printing field.

[0027] The ink filling chamber 61 is rotatably connected to an ink delivery roller 62 that is clearance-fitted with the ink filling chamber 61. The ink delivery roller 62 has an array of ink storage slots 621 arranged in a ring. The angle between the lines connecting the ink storage slots 621 is 90 degrees. The rotation of the ink delivery roller 62 can drive the ink storage slots 621 to move cyclically. The ink storage slots 621 are used to store a fixed amount of ink. Their volume is designed according to the ink replenishment requirements. The design of the ink storage slots 621 allows the ink delivery roller 62 to complete a fixed amount of ink replenishment every 90 degrees of rotation.

[0028] A protective cover 63 is fixedly installed at one end of the ink filling chamber 61 that protrudes from the printhead body 1. A guide shaft 631 arranged in a ring array is slidably connected to the protective cover 63. A wedge-shaped slider 632 is fixedly installed at one end of the guide shaft 631 that extends into the protective cover 63. Each wedge-shaped slider 632 is fitted with a return spring 6321. The two ends of the return spring 6321 are respectively connected to the wedge-shaped slider 632 and the protective cover 63. The protective cover 63 adopts a dustproof and waterproof structure design to protect the moving parts such as the ink delivery wheel 62 and the directional wheel 64 inside the ink replenishment mechanism 6, and prevent external dust and impurities from entering and affecting the parts. During normal operation, the guide shaft 631 guides the sliding of the wedge slider 632, ensuring that the wedge slider 632 moves along the radial direction of the protective cover 63. The wedge structure of the wedge slider 632 is adapted to the wedge groove 641 on the directional wheel 64 to achieve unidirectional rotation limit of the directional wheel 64. The return spring 6321 is a compression spring, and its elastic force can push the wedge slider 632 to always be in contact with the surface of the directional wheel 64. When the wedge slider 632 disengages from the wedge groove 641, the return spring 6321 can drive the wedge slider 632 to quickly return to its original position and always abut against the directional wheel 64.

[0029] A directional roller 64 is rotatably connected within the protective cover 63. The directional roller 64 is fixedly connected to the ink delivery roller 62 via a rotating rod and is concentrically distributed with the protective cover 63 and the ink filling chamber 61. The directional roller 64 also has a wedge-shaped groove 641 adapted to the wedge-shaped slider 632. The directional roller 64 also has a tension spring 642 eccentrically positioned with the rotating rod on the directional roller 64. The directional roller 64 can drive the ink delivery roller 62 to rotate synchronously via the rotating rod, realizing the ink replenishment action. When the directional roller 64 rotates clockwise... When the wedge slider 632 is compressed by the wedge groove 641 and slides along the guide shaft 631, it disengages from the wedge groove 641. When the directional wheel 64 has a tendency to rotate in the opposite direction, the wedge slider 632 is engaged in the wedge groove 641 by the return spring 6321 to achieve directional limit and prevent the ink feed wheel 62 from rotating in the opposite direction and causing ink backflow. The tension spring 642 provides a reset tension for the directional wheel 64 to ensure that the directional wheel 64 can reset synchronously when the swing arm 651 resets.

[0030] A micro motor 65 is also fixedly installed outside the protective cover 63. The output shaft of the micro motor 65 extends to one end of the protective cover 63 and is fixedly installed with a swing arm 651. One end of the swing arm 651 is elastically connected to the directional wheel 64 through a tension spring 642. The micro motor 65 is also electrically connected to the ink volume detection sensor 6121. The micro motor 65 serves as the power source for the ink replenishment mechanism 6. It is a micro DC motor with advantages such as small size, controllable speed, and stable torque. Its fixed installation on the outside of the protective cover 63 can prevent ink from contacting the motor and causing malfunction. The swing arm 651 is fixedly connected to the output shaft of the micro motor 65. When the micro motor 65 rotates, it can drive the swing arm 651 to swing back and forth. The swing arm 651 pulls the directional wheel 64 to rotate through the tension spring 642, which in turn drives the ink delivery wheel 62 to rotate to replenish ink. When the ink level detection sensor 6121 detects that the ink level in the ink storage chamber 11 is insufficient, it sends an electrical signal to the micro motor 65 to control the micro motor 65 to start and drive the swing arm 651 to swing, thus completing the quantitative ink replenishment. When the ink level reaches the preset upper limit, the ink level detection sensor 6121 sends a stop signal, and the micro motor 65 stops working, realizing the automatic control of the ink replenishment action without manual intervention.

[0031] The internal circulation channel unit 4 is provided with an inlet main ink channel 41 and an outlet main ink channel 43, which are connected to the ink storage chamber 11 and the ink return chamber 12, respectively. The inlet main ink channel 41 also has a pressure chamber 42 adapted to the piezoelectric drive unit 5. A first flow limiter 411 is provided at the end of the inlet main ink channel 41 near the pressure chamber 42, and a second flow limiter 431 is provided at the end of the outlet main ink channel 43 near the pressure chamber 42. A nozzle 421 is provided at the end of the pressure chamber 42 away from the inlet main ink channel 41, and one end of the nozzle 421 protrudes outside the printhead body 1. The inlet main ink channel 41 is used to guide the ink from the ink storage chamber 11 into the pressure chamber 42, and the outlet main ink channel 43... 3 is used to guide unsprayed ink from pressure chamber 42 to ink return chamber 12, forming an internal ink circulation. This effectively prevents ink from stagnating and deteriorating in pressure chamber 42, while also removing air bubbles and improving ink quality. The volume of pressure chamber 42 is adapted to the deformation amplitude of piezoelectric drive unit 5, ensuring that sufficient pressure is generated when piezoelectric drive unit 5 deforms to push ink droplets out of nozzle 421. Both the first flow limiter 411 and the second flow limiter 431 adopt a throttling structure design. The first flow limiter 411 is used to limit the ink flow rate entering pressure chamber 42, avoiding excessive ink flow that could cause unstable pressure in pressure chamber 42. The second flow limiter 431 is used to limit the ink flow rate out of pressure chamber 42, ensuring that a stable pressure pulse can be formed in pressure chamber 42. The outlet orifice diameter of nozzle 421 is designed according to printing accuracy requirements, ensuring that ink droplets can be accurately sprayed onto the surface of the printing medium to complete the printing action.

[0032] The piezoelectric drive unit 5 includes a silicon substrate 51 and a vibrating plate 52. The silicon substrates 51 are linearly arranged along the length of the vibrating plate 52 and are symmetrically distributed on both sides of the pressure chamber 42. A piezoelectric ceramic layer 53 is provided on the vibrating plate 52, and an upper electrode layer 531 and a lower electrode layer 532 are respectively provided on both sides of the piezoelectric ceramic layer 53. The upper electrode layer 531 is located between the vibrating plate 52 and the piezoelectric ceramic layer 53. The silicon substrate 51 is made of single-crystal silicon material and serves to fix and support the vibrating plate 52 and the piezoelectric ceramic layer 53, while also enhancing the structural strength of the piezoelectric drive unit 5. The vibrating plate 52 serves as the mounting carrier for the piezoelectric ceramic layer 53. Its deformation directly drives the change in volume of the pressure chamber 42, thereby generating pressure pulses to propel ink droplets. The piezoelectric ceramic layer 53 is made of piezoelectric ceramic material with excellent piezoelectric effect and is the core component for generating mechanical deformation. The upper electrode layer 531 and the lower electrode layer 532 are used to apply driving voltage to the piezoelectric ceramic layer 53. When a specific voltage is applied to each electrode layer, the piezoelectric ceramic layer 53 generates a small deformation along the thickness direction under the action of piezoelectric effect, which drives the vibrating plate 52 to vibrate and realize the change in volume of the pressure chamber 42.

[0033] The vibrating plate 52 is also arranged with cutting grooves 521 that penetrate the lower electrode layer 532, the piezoelectric ceramic layer 53, and the upper electrode layer 531 in sequence. The cutting grooves 521 are located between adjacent inner circulation channel units 4. The depth of the cutting grooves 521 is consistent with the total thickness of the vibrating plate 52, the piezoelectric ceramic layer 53, the upper electrode layer 531, and the lower electrode layer 532, ensuring complete penetration of each layer structure to form an independent piezoelectric drive unit 5. The cutting grooves 521 are located between adjacent inner circulation channel units 4. Their function is to achieve vibration isolation between adjacent piezoelectric drive units 5, break the tight connection structure of the traditional integrated plate-shaped piezoelectric ceramic layer 53, reduce the vibration transmission from a single piezoelectric drive unit 5 to adjacent units, and effectively alleviate structural vibration crosstalk.

[0034] The vibrating plate 52 has a single-layer structure of silicon dioxide or silicon nitride.

[0035] During the printing process using this device, the printhead body 1 is first precisely connected to the ink cartridge through the ink inlet 2 and the ink outlet 3. The ink inlet 2 guides the ink from the ink cartridge into the ink storage chamber 11. The ink storage chamber 11 delivers ink to the return ink chamber 12 through the ink flow channel 13. The ink that is not ejected flows back to the ink cartridge through the return ink chamber 12 and the ink outlet 3, forming an ink recycling process. This prevents the ink from stagnating and deteriorating in the flow channel. During this process, the piezoelectric drive unit 5 ensures that each piezoelectric drive unit 5 independently acts on the ink in the corresponding flow channel. The ink filling chamber 61 of the ink replenishment mechanism 6 is connected to the ink cartridge via an ink filling tube 611. The ink filling tube 611 introduces ink from the ink cartridge into the sealed ink filling chamber 61. The ink supply tube 612 delivers the ink from the ink filling chamber 61 to the ink storage chamber 11. The ink level in the ink storage chamber 11 is monitored in real time by an ink level detection sensor 6121. When the ink level is lower than a preset threshold, the ink level detection sensor 6121 sends an electrical signal to the micro motor 65 to start. Its output shaft drives the swing arm 651 to deflect. The swing arm 651 pulls the directional roller 64 to rotate via a tension spring 642. The directional roller 64 drives the ink delivery roller 62 in the ink filling chamber 61 to rotate synchronously via a rotating rod. The ink storage tank 621 on the directional roller can temporarily store the ink introduced into the ink filling chamber 61 through the ink filling tube 611. When the ink delivery roller 62 rotates 90 degrees, the ink storage tank... 621 delivers a fixed amount of ink to the ink supply tube 612 and then injects it into the ink storage chamber 11. When the ink volume detection sensor 6121 detects that the ink volume has reached the preset upper limit, it sends a stop signal, the micro motor 65 stops working, and the ink replenishment action terminates. During this process, the guide shaft 631 guides the wedge slider 632 to slide along the radial direction of the protective cover 63. The reset spring 6321 pushes the wedge slider 632 to always keep it in contact with the directional roller 64. Through the final engagement of the wedge slider 632 with the wedge groove 641 on the directional roller 64, the directional roller 64 is limited to one-way rotation, preventing the ink supply wheel 62 from rotating in the opposite direction and causing ink backflow. At the same time, the tension spring 642 provides a reset tension for the directional roller 64, ensuring that the directional roller 64 resets synchronously when the swing arm 651 resets, preparing for the next ink replenishment.

[0036] During inkjet printing, the main ink channel 41 on the inner circulation channel unit 4 guides the ink in the ink storage chamber 11 into the pressure chamber 42. The first flow limiter 411, in conjunction with the second flow limiter 431, restricts the overall ink flow. The piezoelectric drive unit 5 starts working. The silicon substrate 51 supports the vibrating plate 52 and the piezoelectric ceramic layer 53. A specific voltage is applied to the piezoelectric ceramic layer 53 through the upper electrode layer 531 and the lower electrode layer 532. Under the action of the piezoelectric effect, the piezoelectric ceramic layer 53 produces a small deformation along the thickness direction, which drives the vibrating plate 52 to vibrate, thereby changing the volume of the pressure chamber 42 and generating pressure pulses. The vibration isolation between adjacent piezoelectric drive units 5 is achieved through the cutting grooves 521 on the vibrating plate 52, which alleviates vibration crosstalk. Under the action of the pressure pulses, the ink in the pressure chamber 42 is ejected from the nozzle 421 protruding from the printhead body 1. The ink that is not ejected is led out through the main ink channel 43 to the ink return chamber 12 and enters the ink circulation process, completing one printing cycle.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A piezoelectric inkjet printhead device based on a vibrating plate groove, characterized in that: The device includes a printhead body (1), with an ink inlet (2) and an ink outlet (3) arranged linearly at both ends. The printhead body (1) outputs and inputs ink from the ink cartridge through the ink inlet (2) and the ink outlet (3). The printhead body (1) also has an internal circulation channel unit (4) for internal ink circulation. The internal circulation channel unit (4) is equipped with a piezoelectric drive unit (5) for generating pressure pulses. One end of the printhead body (1) is also provided with an ink replenishment mechanism (6) for replenishing ink. The printhead body (1) is provided with an ink storage chamber (11) and an ink return chamber (12), and the ink storage chamber (11) and the ink return chamber (12) are connected to the ink cartridge through the ink inlet (2) and the ink outlet (3), respectively. Ink channels (13) are also arranged between the ink storage chamber (11) and the ink return chamber (12), and the ink storage chamber (11) and the ink return chamber (12) are connected through the ink channels (13). The ink channels (13) are arranged one-to-one with the piezoelectric drive unit (5).

2. The piezoelectric inkjet printhead device based on a vibrating plate groove according to claim 1, characterized in that, The ink replenishment mechanism (6) includes an ink filling chamber (61) fixedly installed on the printhead body (1). The ink filling chamber (61) is provided with an ink filling tube (611) connected to the ink cartridge. The ink filling chamber (61) is also provided with an ink supply tube (612) connected to the ink storage chamber (11). An ink quantity detection sensor (6121) is provided at one end of the ink supply tube (612) extending into the ink storage chamber (11).

3. The piezoelectric inkjet printhead device based on a vibrating plate groove according to claim 2, characterized in that, The ink filling chamber (61) is rotatably connected to an ink feeding wheel (62) that is in clearance fit with the ink filling chamber (61), and the ink feeding wheel (62) is provided with an ink storage groove (621) arranged in a ring array, and the included angle of the line connecting the ink storage grooves (621) is ninety degrees.

4. The piezoelectric inkjet printhead device based on a vibrating plate groove according to claim 2, characterized in that, A protective cover (63) is fixedly installed at one end of the ink filling chamber (61) protruding from the printhead body (1). A guide shaft (631) arranged in a ring array is slidably connected on the protective cover (63). A wedge-shaped slider (632) is fixedly installed at one end of the guide shaft (631) extending into the protective cover (63). A return spring (6321) is sleeved on the outside of each wedge-shaped slider (632). The two ends of the return spring (6321) are respectively connected to the wedge-shaped slider (632) and the protective cover (63).

5. The piezoelectric inkjet printhead device based on a vibrating plate groove according to claim 4, characterized in that, The protective cover (63) is also rotatably connected to a directional roller (64). The directional roller (64) is fixedly connected to the ink feeding roller (62) via a rotating rod and is concentrically distributed with the protective cover (63) and the ink filling chamber (61). The directional roller (64) is also provided with a wedge groove (641) that matches the wedge slider (632). The directional roller (64) is also provided with a tension spring (642) that is eccentrically set with the rotating rod on the directional roller (64).

6. The piezoelectric inkjet printhead device based on a vibrating plate groove according to claim 5, characterized in that, A micro motor (65) is also fixedly installed outside the protective cover (63). The output shaft of the micro motor (65) extends to one end of the protective cover (63) and a swing arm (651) is fixedly installed thereon. One end of the swing arm (651) is elastically connected to the directional wheel (64) through a tension spring (642). The micro motor (65) is also electrically connected to the ink volume detection sensor (6121).

7. The piezoelectric inkjet printhead device based on a vibrating plate groove according to claim 1, characterized in that, The internal circulation channel unit (4) is provided with an inlet main ink channel (41) and an outlet main ink channel (43) that are connected to the ink storage chamber (11) and the ink return chamber (12), respectively. The inlet main ink channel (41) is also provided with a pressure chamber (42) adapted to the piezoelectric drive unit (5). The end of the inlet main ink channel (41) near the pressure chamber (42) is provided with a first flow limiter (411), and the end of the outlet main ink channel (43) near the pressure chamber (42) is provided with a second flow limiter (431). The end of the pressure chamber (42) away from the inlet main ink channel (41) is provided with a nozzle (421), and one end of the nozzle (421) protrudes outside the printhead body (1).

8. The piezoelectric inkjet printhead device based on a vibrating plate groove according to claim 7, characterized in that, The piezoelectric drive unit (5) includes a silicon substrate (51) and a vibrating plate (52). The silicon substrate (51) is arranged linearly along the length of the vibrating plate (52). The silicon substrate (51) is symmetrically distributed on both sides of the pressure chamber (42). The vibrating plate (52) is provided with a piezoelectric ceramic layer (53). The two sides of the piezoelectric ceramic layer (53) are respectively provided with an upper electrode layer (531) and a lower electrode layer (532). The upper electrode layer (531) is located between the vibrating plate (52) and the piezoelectric ceramic layer (53).

9. The piezoelectric inkjet printhead device based on a vibrating plate groove according to claim 8, characterized in that, The vibrating plate (52) is also arranged with cutting grooves (521) that pass through the lower electrode layer (532), the piezoelectric ceramic layer (53), and the upper electrode layer (531) in sequence, and the cutting grooves (521) are located between adjacent inner circulation channel units (4).

10. The piezoelectric inkjet printhead device based on a vibrating plate groove according to claim 8, characterized in that, The vibrating plate (52) is a single-layer structure of silicon dioxide or silicon nitride.

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