CN221433707U - Hole wall inking spraying mechanism - Google Patents

Abstract

The utility model relates to the technical field of product ink jet, and particularly discloses a hole wall ink-jet spraying mechanism capable of reducing spraying offset tolerance and improving finished product yield and product spraying quality, which comprises a frame, an XYZ three-axis driving mechanism, a rotating mechanism, a CCD camera module, a piezoelectric injection valve and a control unit, wherein the frame is provided with a first driving mechanism, a second driving mechanism and a third driving mechanism; the XYZ three-axis driving mechanism comprises an X-axis linear module fixed on the frame and extending along the length direction of the frame, a Y-axis linear module slidably arranged on the X-axis linear module along the width direction of the frame, and a Z-axis linear module slidably arranged on the Y-axis linear module along the height direction of the frame, wherein the Z-axis linear module is provided with a lifting structural member which can lift along the height direction of the frame and is provided with a CCD camera module and a rotating mechanism; the rotating mechanism comprises a rotating motor fixed on the lifting structural member and a rotating mounting piece fixedly connected with the output end of the rotating motor and used for loading the piezoelectric injection valve.

Description

Hole wall inking spraying mechanism

Technical Field

The utility model relates to the technical field of product ink jet, in particular to a hole wall ink-jet spraying mechanism.

Background

In the spraying operation of the product, in order to ensure that all parts to be sprayed on the surface of the product can be contacted with a sprayed object, the relative rotation of the product and the nozzle is required to be controlled so as to spray all parts on the surface of the product one by one, thereby ensuring the spraying quality. At present, the hole wall spraying mode in the industry mostly adsorbs products through an operation platform, and after a nozzle is fixed at a spraying position, the spraying platform rotates to enable all parts on the products to be aligned with the nozzle through rotation so as to spray. Because when the platform rotates, the product adsorbed on the platform is easy to deviate, the part to be sprayed on the product is changed, the thickness of the coating on each part of the surface of the product is uneven, even part of the area to be sprayed is not sprayed with the coating, the product is poor, and the surface of the product is also easy to be scratched by external objects in the process of deviation caused by the rotation of the platform, thereby further affecting the quality of the product and improving the reject ratio of the product. In addition, under the condition of adopting the spraying mode, the offset distance of the product exceeds the positioning compensation capability of a CCD (Charge-Coup LED DEVICE) camera, so that the positioning precision of the product is insufficient, and the spraying quality of the product is further affected.

Disclosure of utility model

Aiming at the defects, the utility model provides the hole wall spot ink spraying mechanism which can reduce the spraying offset tolerance and improve the yield and the spraying quality of the finished product.

The hole wall inking spraying mechanism comprises a frame, an XYZ three-axis driving mechanism arranged on the frame, a rotating mechanism and a CCD camera module which are arranged at the adjusting end of the XYZ three-axis driving mechanism, a piezoelectric injection valve arranged on the rotating mechanism and rotating along with the rotating mechanism, and a control unit;

The XYZ three-axis driving mechanism comprises an X-axis linear module fixed on the frame and extending along the length direction of the frame, a Y-axis linear module slidably mounted on the X-axis linear module and extending along the width direction of the frame, and a Z-axis linear module slidably mounted on the Y-axis linear module and extending along the height direction of the frame, wherein a lifting structural member capable of lifting along the height direction of the frame is arranged on the Z-axis linear module, and the CCD camera module and the rotating mechanism are fixed on the lifting structural member;

The rotary mechanism comprises a rotary motor fixed on the lifting structural member and a rotary mounting piece fixedly connected with the output end of the rotary motor and used for loading the piezoelectric injection valve, and the rotary mounting piece drives the piezoelectric injection valve to rotate in a horizontal plane;

The control unit is respectively and electrically connected with the X-axis linear module, the Y-axis linear module, the Z-axis linear module, the rotating motor, the CCD camera module and the piezoelectric injection valve;

The piezoelectric injection valve moves in a three-dimensional space under the action of the XYZ three-axis driving mechanism and rotates along with the rotary mounting piece under the drive of the rotary motor so as to adapt to the position change of the part to be sprayed on the product.

In one embodiment, the piezoelectric jetting valve includes a valve body for controlling the frequency of ink jetting, a flow path assembly for communicating with an external ink tank and providing an ink flow path, a nozzle assembly disposed at an output end of the flow path assembly and providing an ink output path for controlling the size of ink droplets of ink, and a firing pin assembly mounted on the valve body and located above the nozzle assembly, the firing pin assembly being driven by the valve body to be adjacent to or remote from the nozzle assembly such that ink flowing to the nozzle assembly is ejected from the output end of the nozzle assembly.

In one embodiment, the valve body is internally provided with a piezoelectric injection module for controlling the movement frequency of the firing pin assembly and a heat insulation cushion block arranged at the bottom of the piezoelectric injection module.

In one embodiment, the runner assembly comprises a valve seat, an adapter and a connector, wherein the valve seat is arranged below the valve body and internally provided with a runner, the adapter is connected with one end, far away from the valve body, of the valve seat and communicated with the runner, the connector is communicated with one end, far away from the valve seat, of the adapter and used for accessing external ink, the valve seat is provided with a collision hole penetrating through the upper surface and the lower surface of the valve seat and communicated with the runner, and the collision hole is positioned below the striker assembly.

In one embodiment, the firing pin assembly comprises a firing pin penetrating through the heat insulation cushion block and in driving connection with the piezoelectric spraying module, a guide shaft sleeved on the lower portion of the firing pin in a sliding mode, a compression spring sleeved on the firing pin and located between the firing pin and the guide shaft, and a sealing piece sleeved on the firing pin and located below the guide shaft, wherein the firing pin is periodically inserted into or separated from the striking hole under the driving of the piezoelectric spraying module, and the sealing piece covers the upper opening of the striking hole.

In one embodiment, the nozzle assembly includes a guide tube secured to the bottom of the valve seat and in communication with the striker bore, and a nozzle secured to the bottom of the guide tube and in communication with the guide tube lumen.

In one embodiment, the nozzle assembly further comprises an adjustment nut positioned below the nozzle for adjusting the tightness of the nozzle.

In one embodiment, the piezoelectric jetting valve further comprises a heating seat fixed on the nozzle, a heating channel communicated with the output end of the nozzle is formed in the heating seat, and a heating piece for heating ink in the heating channel is further arranged on the heating seat.

In one embodiment, the hole wall ink-dispensing spraying mechanism further comprises a touch display screen or a control panel electrically connected with the control unit.

According to the hole wall ink-spraying mechanism, the CCD camera module and the piezoelectric spraying valve are driven to move in a three-dimensional space through the XYZ three-axis driving mechanism, the parameters of the XYZ three-axis driving mechanism are adjusted to ensure that the piezoelectric spraying valve rotates stably with high precision, the product offset problem caused by adopting the operation platform to drive a product to rotate is avoided, the accurate control of the thickness of a coating layer is facilitated when the surface of the product is sprayed, the product spraying offset tolerance is reduced, the product is prevented from being scratched in the rotation process, and the product yield is improved; the CCD camera module rotates along with the piezoelectric injection valve under the drive of the XYZ three-axis driving mechanism, so that the product position can be aligned, compensated and positioned, and the piezoelectric injection valve is driven by the XYZ three-axis driving mechanism to accurately move to the operation position for ink injection, so that the positioning precision of the injection position is improved, and the spraying quality is further improved.

Drawings

FIG. 1 is a schematic diagram of a hole wall spot ink spraying mechanism in accordance with one embodiment of the present utility model;

FIG. 2 is a side view of a hole wall spot ink spraying mechanism in one embodiment of the utility model;

Fig. 3 is a schematic diagram showing an exploded structure of a piezoelectric jetting valve in an embodiment of the present utility model.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Aiming at the problems that in the traditional product spraying operation, the spraying yield is low due to the fact that products are easily offset caused by the mode that an injection valve is fixed and a platform rotates to drive the products to rotate; and because the product is easy to scratch during the rotation offset, the CCD positioning compensation significance is not great under the condition of the product offset, and then the problem of product spraying quality reduction is caused, through fixing the product, the XYZ three-axis driving mechanism is utilized to drive the CCD camera module and the piezoelectric injection valve to move in the three-dimensional space, the relative position adjustment between the nozzle and the product is realized, the problem of product offset caused by the movement of the product is replaced, the high-precision position adjustment of the CCD camera module and the piezoelectric injection valve is realized through the XYZ three-axis driving mechanism, the product spraying effect is improved, and because the product does not offset, the positioning compensation capability of the CCD camera module can be combined to adjust the operation parameters of the XYZ three-axis driving mechanism, the spraying precision of the piezoelectric injection valve to the product is further improved, and the spraying quality is improved. In particular, under the condition that the piezoelectric injection valve is matched with the XYZ three-axis driving mechanism and the CCD camera module, high-speed, precision and non-contact injection of low, medium and high-viscosity media can be realized, the injection quantity of the high-precision piezoelectric injection valve can be ensured to be accurate to 1n l, the consistency precision of injection glue points can be ensured to be up to 99%, and the injection on extremely narrow space or steps can be realized.

Referring to fig. 1 and 2, the hole wall ink dispensing and spraying mechanism 10 of the present embodiment includes a frame 100, an XYZ three-axis driving mechanism 200 disposed on the frame 100, a rotation mechanism 300 and a CCD image capturing module 400 disposed at an adjusting end of the XYZ three-axis driving mechanism 200, a piezoelectric spray valve 500 mounted on the rotation mechanism 300 and rotating along with the rotation mechanism 300, and a control unit (not shown), wherein the hole wall ink dispensing and spraying mechanism 10 is used for performing ink dispensing (dispensing) operation on a product disposed on a dispensing platform, the frame 100 is fixed at a side of the dispensing platform, and is used for supporting the XYZ three-axis driving mechanism 200, the rotation mechanism 300, the CCD image capturing module 400 and the piezoelectric spray valve 500, and lifting the horizontal heights of the XYZ three-axis driving mechanism 200, the rotation mechanism 300, the CCD image capturing module 400 and the piezoelectric spray valve 500, so that the CCD image capturing module 400 can collect corresponding image signals from above the dispensing platform, and the piezoelectric spray the product from above the dispensing platform. The XYZ three-axis driving mechanism 200 is used for controlling the positions of the CCD camera module 400 and the piezo jet valve 500 in three-dimensional space, that is, controlling the positions of the CCD camera module 400 and the piezo jet valve 500 in the front-back, left-right, and up-down directions, so as to adjust the positions of the CCD camera module 400 and the piezo jet valve 500, respectively, with respect to the product. The rotating mechanism 300 is used for driving the piezoelectric injection valve 500 to rotate relative to the product, so that the nozzle of the piezoelectric injection valve 500 rotates to correspond to the corresponding position to be sprayed on the product. The CCD camera module 400 is used for realizing positioning compensation of a product, sending a positioning compensation signal to the control unit, and feeding back and adjusting the work of the XYZ three-axis driving mechanism 200 by the control unit to accurately adjust the position of the piezoelectric injection valve 500, wherein the piezoelectric injection valve 500 is used for spraying ink to a specific position on the surface of the product, and the control unit is used for controlling the whole machine to work.

The frame 100 comprises two upright posts which are oppositely arranged, and a transverse plate which is positioned at the top ends of the upright posts and is fixedly connected with the two upright posts respectively, wherein the upright posts and the transverse plate are fixedly connected through bolts, the upright posts can also be fixedly connected through welding, the upright posts can be integrally formed with the transverse plate, and the bottoms of the upright posts are fixed on a device beside the dispensing operation platform through bolts.

The XYZ three-axis driving mechanism 200 includes an X-axis linear module 210 fixed to the frame 100 and extending in the longitudinal direction of the frame 100, a Y-axis linear module 220 slidably mounted on the X-axis linear module 210 and extending in the width direction of the frame 100, and a Z-axis linear module 230 slidably mounted on the Y-axis linear module 220 and extending in the height direction of the frame 100, a lifting structure 240 being provided on the Z-axis linear module 230 and being liftable in the height direction of the frame 100, and the ccd camera module and the rotating mechanism 300 being fixed to the lifting structure 240. Specifically, the X-axis linear module 210 is fixed on the transverse plate and extends along the length direction of the transverse plate, and the X-axis linear module 210, the Y-axis linear module 220 and the Z-axis linear module 230 may be screw modules, linear modules or other linear driving mechanisms. In this embodiment, the X-axis linear module 210 includes an X-axis sliding rail 211 fixed on the transverse plate and extending along the length direction of the transverse plate, a Y-axis sliding rail 212 slidably disposed on the X-axis sliding rail 211 and perpendicular to the X-axis sliding rail 211, and an X-axis motor 213 fixed on the X-axis sliding rail 211 and drivingly connected to the Y-axis sliding rail 212 to move the Y-axis sliding rail 212 along the X-axis direction; the Y-axis linear module 220 comprises a Z-axis sliding rail 221 which is slidably arranged on the Y-axis sliding rail 212 and is respectively perpendicular to the X-axis sliding rail 211 and the Y-axis sliding rail 212, and a Y-axis motor 222 which is fixed on the Y-axis sliding rail 212 and is in driving connection with the Z-axis sliding rail 221 so as to enable the Z-axis sliding rail 221 to move along the Y-axis direction; the Z-axis linear module 230 includes a Z-axis motor fixed to the top end of the Z-axis sliding rail 221 and drivingly connected to the lifting structure 240, so that the lifting structure 240 moves along the Z-axis direction. In this embodiment, the X-axis direction refers to the longitudinal direction of the transverse plate (i.e., the longitudinal direction of the frame 100), the Y-axis direction refers to the width direction of the transverse plate (i.e., the width direction of the frame 100), and the Z-axis direction refers to the thickness direction of the transverse plate (i.e., the height direction of the frame 100). In this embodiment, the precision of the X-axis linear module 210, the Y-axis linear module 220, and the Z-axis linear module 230 is ±0.03mm, and the precision of the rotation mechanism 300 is ±0.03 °.

The rotating mechanism 300 comprises a rotating motor 310 fixed on the lifting structural member 240, and a rotating mounting piece 320 fixedly connected with the output end of the rotating motor 310 and used for loading the piezoelectric injection valve 500, wherein the rotating mounting piece 320 drives the piezoelectric injection valve 500 to rotate in a horizontal plane. In other words, in this embodiment, the rotary mounting member 320 is fixed at the bottom end of the output shaft of the rotary motor 310 and extends along the height direction of the frame 100, when the rotary motor 310 works, the rotary motor 310 drives the rotary mounting member 320 to rotate in a horizontal plane, so that the piezoelectric injection valve 500 rotates relative to the product, and 360-degree dead angle-free rotation of the nozzle is realized, so that the whole hole wall of the product can be covered by ink, and even 720-1080-degree layer-increasing effect can be achieved on the hole wall ink; in addition, by controlling the rotational speed of the rotary motor 310, the thickness of the ejected ink covering the product hole wall can be effectively controlled.

The control unit is electrically connected to the X-axis linear module 210, the Y-axis linear module 220, the Z-axis linear module 230, the rotary motor 310, the CCD camera module 400, and the piezo jet valve 500, respectively. Preferably, the control unit of the embodiment is a PLC controller or a single chip microcomputer. The piezoelectric jetting valve 500 moves in three dimensions under the action of the XYZ three-axis driving mechanism 200 and rotates along with the rotary mounting member 320 under the drive of the rotary motor 310, so as to adapt to the position change of the part to be sprayed on the product. Further, in this embodiment, the CCD camera module 400 includes a CCD camera and two camera holes located at the collecting end of the CCD camera, the CCD camera captures the outlines of the two camera holes, after positioning, compensation is performed according to the position of the adsorbed product, the size of the CCD pixel is 2.4um x 2.4um, the size of the pixel point can reach 0.01mm, and theoretical precision is ±0.03mm.

In the working process of the hole wall ink dispensing spraying mechanism 10, after the machine is started normally, the conveying manipulator conveys the product to the dispensing operation platform, and the dispensing operation platform is opened by vacuum adsorption and adsorbs and fixes the product. The control unit firstly controls the operation of the X-axis linear module 210, the Y-axis linear module 220, the Z-axis linear module 230 and the rotating motor 310, so that the piezoelectric injection valve 500 moves to a preset spraying operation position, in the process, the CCD camera module 400 moves to the upper part of a product to take a picture and compensates the offset position in a range, positioning compensation signals are sent to the control unit, the control unit feeds back and adjusts the working parameters of the X-axis linear module 210, the Y-axis linear module 220 and the Z-axis linear module 230, so that the position of the piezoelectric injection valve 500 is accurately adjusted, the piezoelectric injection valve 500 moves to the upper part of the product, the product rotates to discharge ink through the set rotating parameters of the rotating motor 310 and the parameters of the piezoelectric injection valve 500, and after the ink is discharged, the product is transported to the next station, and at the moment, the whole ink-discharging station flow is finished.

In one embodiment, the hole wall ink spraying mechanism 10 further includes a touch display screen or a control panel electrically connected to the control unit. An operator can check the state indication condition (the rotating speed, the rotating angle and the like of the rotating motor 310) of the hole wall ink spraying mechanism 10 through a touch display screen or a control panel, and can change parameters (voltage, stroke, dispensing cycle glue feeding time and the like) for controlling the piezoelectric injection valve 500 to ensure the state of ink discharge.

In this embodiment, the piezoelectric injection valve 500 is a non-contact cold glue injection valve, which adopts a high-performance piezoelectric ceramic material, the piezoelectric ceramic material can generate micron-level deformation in a controllable range from microsecond to millisecond under the drive of voltage, the injection frequency is high, the equipment structure is simple, and the injection generated by the piezoelectric ceramic can obtain glue points with smaller diameters; on the other hand, the control precision of the piezoelectric structure is high, and the dispensing quality is well ensured. Referring to fig. 1-3, the piezoelectric jet valve 500 includes a valve body 510 for controlling the frequency of ink jet, a flow path assembly 520 for communicating with an external ink tank and providing an ink flow path, a nozzle assembly 530 disposed at an output end of the flow path assembly 520 and providing an ink output path for controlling the size of ink droplets, and a firing pin assembly 540 mounted on the valve body 510 and located above the nozzle assembly 530, the firing pin assembly 540 being driven by the valve body 510 to be close to or away from the nozzle assembly 530 such that ink flowing to the nozzle assembly 530 is ejected from the output end of the nozzle assembly 530. In this embodiment, the flow path assembly 520 is accessed with ink from an external ink tank, and the firing pin assembly 540 is periodically moved toward or away from the nozzle assembly 530 by the valve body 510, so that ink entering the nozzle assembly 530 via the flow path assembly 520 is ejected from the output end of the nozzle assembly 530 onto the surface of the product at a predetermined frequency to complete the ink application.

The valve body 510 is internally provided with a piezoelectric spraying module 511 for controlling the movement frequency of the firing pin assembly 540 and a heat insulation cushion block 512 arranged at the bottom of the piezoelectric spraying module 511, the piezoelectric spraying module 511 is electrically connected with the control unit, and the heat insulation cushion block 512 is used for separating part of components of the piezoelectric spraying module 511 and the firing pin assembly 540 so as to prevent the firing pin assembly 540 from transferring heat carried by ink to the piezoelectric spraying module 511 and further cause overheat damage of the piezoelectric spraying module 511.

The flow path assembly 520 includes a valve seat 521 provided under the valve body 510 and having a flow path therein, an adapter 522 connected to an end of the valve seat 521 remote from the valve body 510 and communicating with the flow path, and a connector 523 connected to an end of the adapter 522 remote from the valve seat 521 and adapted to be connected to external ink, and the valve seat 521 is provided with a striker hole penetrating an upper surface and a lower surface of the valve seat 521 and communicating with the flow path, the striker hole being located under the striker assembly 540 to provide an acting portion of the striker assembly 540. In this embodiment, the joint 523 is disposed perpendicular to the valve seat 521, the joint 522 is disposed with a sealing ring at a portion where the joint 523 is matched with the joint 522 and a portion where the joint 522 is matched with the valve seat 521, the valve seat 521 is penetrated at an end far from the valve body 510 under the constraint of a processing technology, a cylindrical head screw 524 for sealing the penetrated portion and a rubber ring for ensuring the connection tightness are disposed on the valve seat 521, and the joint 522 is adjacent to an end far from the valve body 510 on the valve seat 521 and is communicated with the flow passage.

The striker assembly 540 includes a striker 541 penetrating through the heat insulation pad 512 and drivingly connected to the piezoelectric jetting module 511, a guide shaft 542 slidably fitted to a lower portion of the striker 541, a compression spring 543 fitted over the striker 541 and positioned between the striker 541 and the guide shaft 542, and a seal 544 fitted over the striker 541 and positioned below the guide shaft 542, the striker 541 being periodically inserted into or separated from the striker by the piezoelectric jetting module 511, the seal 544 covering an upper opening of the striker. Preferably, the seal 544 is a flood seal. The seal 544 always seals the upper opening edge of the striker hole to avoid contamination of the valve body 510 by ink flowing out through the upper opening of the striker hole. During the lifting of the striker 541 driven by the electrospray module 511, the guide shaft 542 approaches or departs from the seal 544, so that the compression spring 543 deforms, so that the compression spring 543 buffers the impact of the guide shaft 542 due to the compression of the valve seat 521, and provides a restoring force for the return of the guide shaft 542.

The nozzle assembly 530 includes a guide pipe 531 fixed to the bottom of the valve seat 521 and communicating with the collision hole, and a nozzle 532 fixed to the bottom of the guide pipe 531 and communicating with the inner cavity of the guide pipe 531. Further, the nozzle 532 assembly 530 further includes an adjustment nut 533 positioned below the nozzle 532 for adjusting the tightness of the nozzle 532. In this embodiment, the size of the output end (i.e. the glue outlet) of the nozzle 532 determines the size of the ink droplet ejected from the nozzle 532, and the tightness of the nozzle 532 is adjusted by the adjusting nut 533, so as to ensure the glue output and avoid the phenomenon of glue hanging. In addition, the present embodiment employs the nozzle 532 having a diameter of 0.1mm, which can satisfy the ink discharge amount and avoid the problem that the nozzle 532 is easily blocked. Of course, in other embodiments, other types of nozzles 532 may be selected according to the size requirement of the ink droplet, the ink-jet rate of the product, and the ink-jet quality requirement, which will not be described herein.

In addition, in an embodiment, the piezo jet valve 500 further includes a heating seat 550 fixed on the nozzle 532, a heating channel communicating with the output end of the nozzle 532 is formed on the heating seat 550, and a heating element 551 for heating the ink in the heating channel is further formed on the heating seat 550. The heating seat 550 is configured to meet the requirement that part of the ink needs to be heated and then sprayed, and in actual operation, even if cold glue spraying is performed, the heating seat 550 can still be provided, and only the heating element needs to be controlled to be not operated.

The foregoing description of the preferred embodiment of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (9)

1. The hole wall ink-spraying mechanism is characterized by comprising a frame, an XYZ three-axis driving mechanism arranged on the frame, a rotating mechanism and a CCD camera module which are arranged at the adjusting end of the XYZ three-axis driving mechanism, a piezoelectric injection valve arranged on the rotating mechanism and rotating along with the rotating mechanism, and a control unit;

The XYZ three-axis driving mechanism comprises an X-axis linear module fixed on the frame and extending along the length direction of the frame, a Y-axis linear module slidably mounted on the X-axis linear module and extending along the width direction of the frame, and a Z-axis linear module slidably mounted on the Y-axis linear module and extending along the height direction of the frame, wherein a lifting structural member capable of lifting along the height direction of the frame is arranged on the Z-axis linear module, and the CCD camera module and the rotating mechanism are fixed on the lifting structural member;

The rotary mechanism comprises a rotary motor fixed on the lifting structural member and a rotary mounting piece fixedly connected with the output end of the rotary motor and used for loading the piezoelectric injection valve, and the rotary mounting piece drives the piezoelectric injection valve to rotate in a horizontal plane;

The control unit is respectively and electrically connected with the X-axis linear module, the Y-axis linear module, the Z-axis linear module, the rotating motor, the CCD camera module and the piezoelectric injection valve;

The piezoelectric injection valve moves in a three-dimensional space under the action of the XYZ three-axis driving mechanism and rotates along with the rotary mounting piece under the drive of the rotary motor so as to adapt to the position change of the part to be sprayed on the product.

2. The orifice wall spot ink spraying mechanism of claim 1 wherein the piezoelectric spray valve comprises a valve body for controlling the frequency of ink spray, a flow path assembly for communicating with an external ink tank and providing an ink flow path, a nozzle assembly disposed at an output end of the flow path assembly and providing an ink output path for controlling the size of ink droplets, a firing pin assembly mounted on the valve body and located above the nozzle assembly, the firing pin assembly being driven by the valve body to be either adjacent to or remote from the nozzle assembly such that ink flowing to the nozzle assembly is sprayed from the output end of the nozzle assembly.

3. The hole wall ink spraying mechanism according to claim 2, wherein a piezoelectric spraying module for controlling the movement frequency of the firing pin assembly and a heat insulation cushion block arranged at the bottom of the piezoelectric spraying module are arranged in the valve body.

4. The orifice wall ink spraying mechanism according to claim 3, wherein the runner assembly comprises a valve seat below the valve body and having a runner therein, an adapter connected to an end of the valve seat remote from the valve body and in communication with the runner, and a connector in communication with an end of the adapter remote from the valve seat and in communication with an external ink, the valve seat being provided with a striker hole penetrating an upper surface and a lower surface of the valve seat and in communication with the runner, the striker hole being located below the striker assembly.

5. The hole wall ink jetting mechanism of claim 4, wherein the firing pin assembly comprises a firing pin penetrating through the heat insulation cushion block and in driving connection with the piezoelectric jetting module, a guide shaft sleeved on the lower portion of the firing pin in a sliding manner, a compression spring sleeved on the firing pin and located between the firing pin and the guide shaft, and a sealing piece sleeved on the firing pin and located below the guide shaft, the firing pin is periodically inserted into or separated from the striking hole under the driving of the piezoelectric jetting module, and the sealing piece covers the upper opening of the striking hole.

6. The orifice wall spot ink spraying mechanism of claim 2 wherein the nozzle assembly comprises a guide tube secured to the bottom of the valve seat and in communication with the impingement orifice, and a nozzle secured to the bottom of the guide tube and in communication with the interior chamber of the guide tube.

7. The orifice wall spot ink spraying mechanism of claim 6, wherein the nozzle assembly further comprises an adjustment nut positioned below the nozzle for adjusting the degree of tightness of the nozzle.

8. The hole wall ink-dispensing spraying mechanism of claim 6, wherein the piezoelectric jetting valve further comprises a heating seat fixed on the nozzle, a heating channel communicated with the output end of the nozzle is arranged on the heating seat, and a heating element for heating ink in the heating channel is further arranged on the heating seat.

9. The hole wall inking spraying mechanism as claimed in claim 3, further comprising a touch display screen or control panel electrically connected to the control unit.