A liquid spraying device for a digital printing machine and a control method thereof

Abstract

The application relates to the technical field of digital printing machines, in particular to a digital printing machine liquid spraying device and a control method thereof. The digital printing machine liquid spraying device comprises a printing machine conveying platform, a hopper connected to one end of the printing machine conveying platform and a liquid spraying device arranged above the printing machine conveying platform. The liquid spraying device comprises a spraying seat, the back surface of the spraying seat is provided with a first sliding rail and a transmission seat, the spraying seat is installed on the discharge port of the printing machine through the first sliding rail and the transmission seat on the back surface, the spraying seat can move back and forth above the printing machine conveying platform towards the direction of the hopper, the problem of surface quality defects of cotton and linen fabrics is solved, the quality of the fabric products after inkjet printing is improved, and the fabric will not cause pattern loss due to secondary cleaning of the fuzz in the later use process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of digital printing machines, in particular to a liquid spraying device of a digital printing machine and a control method thereof. BACKGROUND

[0002] The digital printing machine is composed of an inkjet mechanism, a conveying mechanism, a control system, a transmission mechanism and a material roller installed on the inlet and outlet. The inkjet mechanism of the gantry type digital printing machine is located above the conveying mechanism. The inkjet mechanism is installed on the outlet by the transmission mechanism, and the conveying mechanism and the transmission mechanism are controlled by the control system to work. The transmission mechanism moves the inkjet mechanism back and forth above the cloth, and the control system provides ink (here, the ink color is not limited to black) to the inkjet mechanism, and presents the ink on the cloth in the form of printing.

[0003] Because of different materials, for example, the surface of cotton and hemp cloth has a large number of fluff. If the color is directly printed on the cloth, the fluff will be cleaned together when the fluff is cleaned later, causing the surface of the cloth to appear material shortage phenomenon, affecting the surface quality. SUMMARY

[0004] In order to solve the above problems and improve the quality of the cloth after printing, the present application provides the following technical scheme:

[0005] A liquid spraying device of a digital printing machine, comprising a printing machine conveying platform, a liquid spraying device arranged above the printing machine conveying platform, a hopper connected to one end of the printing machine conveying platform, the liquid spraying device comprising a spray seat, the back of the spray seat being provided with a first sliding rail and a transmission seat, the spray seat being installed on the outlet of the printing machine through the first sliding rail and the transmission seat on the back, so that the spray seat can move back and forth above the printing machine conveying platform towards the direction of the hopper; a cleaning mechanism is installed at one end of the spray seat facing the hopper, the cleaning mechanism comprising a cleaning seat installed on the hopper, one side of the cleaning seat facing the hopper being inclined downward, and a cleaning plate being installed on the inclined surface of the hopper, the cleaning plate facing the hopper, the cleaning seat being able to ascend and descend along the spray seat, the inclined bottom end of the cleaning plate being lifted on the cloth when the cleaning seat descends, the cleaning seat being able to continue to descend along the hopper when moving towards the hopper, the cleaning mechanism further comprising a vibration assembly, the vibration assembly comprising a rotating shaft installed between the cleaning plate and the hopper, and a connecting rod structure installed at the end of the cleaning plate, the connecting rod structure being able to drive the cleaning plate to rotate upward on the inclined surface of the hopper around the rotating shaft, the cleaning plate rotating downward and hitting the inclined surface of the hopper to generate vibration.

[0006] As a further preferred embodiment, a second slide rail is installed on the rear side of the spray seat facing the hopper, and a guide groove is provided on the front side of the spray seat facing the hopper. The two ends of the cleaning seat are engaged in the second slide rail and the guide groove through sliders, and the second slide rail is filled with a guide rod. The slider at the same side end of the spray seat is slidably engaged on the guide rod, and a spring is mounted on the guide rod. The top end of the spring is elastically supported on the top end of the second slide rail, and the bottom end of the spring is elastically supported on the slider.

[0007] As a further preferred embodiment, the top surface of the hopper is lower than the top surface of the printing machine conveying platform. When the cleaning seat moves to the top of the hopper with the cleaning plate, the spring pushes the slider to make the cleaning seat descend along the material mouth of the hopper with the cleaning plate.

[0008] As a further preference, the bottom surface of the cleaning seat gradually slopes downward toward one end of the inclined surface.

[0009] As a further preference, the bottom surface of the inner cavity of the hopper gradually slopes downward toward one end.

[0010] As further preferred, the vibration component also includes a pin shaft installed at the end of the cleaning plate, one end of the connecting rod structure is connected to the pin shaft, the vibration component also includes a reciprocating seat hinged on the other end of the connecting rod structure, and also includes a third slide rail fixed on the cleaning seat, the reciprocating seat is slidably assembled on the third slide rail, and a support spring is provided in the third slide rail, one end of the support spring is pressed against the third slide rail, and the other end is pressed against the reciprocating seat, the reciprocating seat can reciprocate along the third slide rail toward the direction of the cleaning seat, and link the connecting rod structure to drive the cleaning plate to rotate around the rotating shaft on the inclined surface of the cleaning seat, the vibration component also includes a limit block fixed on the top of the hopper, and the limit block is located on the movement path of the reciprocating seat.

[0011] As a further preferred embodiment, a carrier plate is fixed on the top of the hopper, and the limit block is fixed on the top surface of the carrier plate. When the reciprocating seat moves to contact the limit block, the cleaning seat brings the cleaning plate to the top of the hopper.

[0012] A method for controlling a liquid spray device, the method comprising: setting a time in a control module in a control system of the digital printing machine, wherein the time controls a transmission mechanism of the digital printing machine, and the transmission mechanism drives the liquid spray device to move above the hopper;

[0013] The control method also includes setting a distance sensor in the third slide rail, the distance sensor controls the switching between forward and reverse directions of the motor in the transmission mechanism, when the reciprocating seat moves in the reverse direction along the third slide rail to approach the distance sensor, the distance sensor sends a signal to the motor, the motor reverses and drives the spray device to return from above the hopper to the other side of the cloth through the transmission mechanism.

[0014] The beneficial effects of the present invention compared to the prior art are:

[0015] 1. When the nozzle seat moves toward the hopper with the cleaning seat, the cleaning seat will bring the inclined bottom end of the cleaning plate to fall on the cloth surface. As the nozzle seat moves toward the hopper, the inclined bottom end of the cleaning plate is used to clean the lint layer on the cloth surface downwards. As the cleaning plate moves to the top of the hopper, the cleaned lint is pushed into the hopper. The nozzle seat opens the nozzle and follows the back side of the cleaning plate to spray ink onto the cleaned cloth surface, thereby solving the problem of surface quality defects of cotton and linen fabrics, and improving the quality of such fabric products after inkjet printing, so that the fabric will not be lost in pattern due to secondary cleaning of lint during later use.

[0016] 2. A second slide rail is installed on the rear side of the end of the spray seat facing the hopper, and a guide groove is provided on the front side of the end of the spray seat facing the hopper. The two ends of the cleaning seat are matched in the second slide rail and the guide groove through sliders. The cleaning seat can be raised and lowered, and the cleaning seat can be raised and lowered with the cleaning plate. Under the elastic support of the bottom end of the spring, the slider provides a downward thrust to the cleaning seat, so that the cleaning plate is satisfied with its inclined bottom end falling on the cloth, which provides scraping conditions for cleaning the fluff on the cloth, and is satisfied that the inclined bottom end of the cleaning plate will not come into hard contact with the surface of the cloth to cause damage to the cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a liquid spraying device for a digital printing machine provided in an embodiment of the present invention;

[0018] Figure 2 A digital printing machine liquid spraying device provided by the embodiment of the present invention is composed of Figure 1 The enlarged schematic diagram of part A is shown;

[0019] Figure 3 A digital printing machine liquid spraying device provided by the embodiment of the present invention is composed of Figure 1 The enlarged schematic diagram of part B is shown;

[0020] Figure 4 This is a schematic plan view of the end portion of a liquid spraying device for a digital printing machine provided by an embodiment of the present invention;

[0021] Figure 5A schematic view of a digital printing machine liquid spraying device provided by the embodiment of the present application is shown from the side of the hopper;

[0022] Figure 6 A schematic view of the planar structure of the fabric discharge side of the digital printing machine provided by the embodiment of the present application is shown.

[0023] In the figure: 1, printing machine conveying platform; 2, liquid spraying device; 3, hopper; 4, spraying seat; 5, first sliding rail; 6, transmission seat; 7, cleaning mechanism; 8, cleaning seat; 9, cleaning plate; 10, vibration assembly; 11, rotating shaft; 12, connecting rod structure; 13, notch; 14, second sliding rail; 15, guide groove; 16, sliding block; 17, guide rod; 18, spring; 19, pin shaft; 20, return seat; 21, third sliding rail; 22, limiting block; 23, carrier plate; 24, supporting spring. DETAILED DESCRIPTION

[0024] The above and other embodiments and advantages of the present application are more fully described below in conjunction with the attached drawings. It is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments of the present application.

[0025] In one embodiment, as Figures 1-6The embodiment provides a liquid spraying device of a digital printing machine, which comprises a printing machine conveying platform 1, a liquid spraying device 2 arranged above the printing machine conveying platform 1, and a hopper 3 connected to one end of the printing machine conveying platform 1. The liquid spraying device 2 comprises a spraying seat 4, the back of the spraying seat 4 is provided with a first sliding rail 5 and a transmission seat 6, the spraying seat 4 is installed on the discharge port of the printing machine through the first sliding rail 5 and the transmission seat 6 on the back, so that the spraying seat 4 can move back and forth above the printing machine conveying platform 1 towards the hopper 3. The existing printing machine is provided with a liquid spraying system, ink is supplied to the liquid spraying device 2, the printing machine conveying platform 1 is prior art, and only schematic representation is shown in the figure. When the printing machine conveying platform 1 conveys the cloth towards the discharge port, the servo control system (the existing control technology of the printing machine) of the printing machine controls the liquid spraying device 2 to move back and forth above the printing machine conveying platform 1, and the ink is sprayed on the cloth through the spraying seat 4, so that the cloth completes the ink spraying work. In addition to the above-mentioned technology, the hopper 3 is installed at one end of the printing machine conveying platform 1, and a cleaning mechanism 7 is further installed at one end of the spraying seat 4 facing the hopper 3. The cleaning mechanism 7 comprises a cleaning seat 8 installed on the hopper 3, the side of the cleaning seat 8 facing the hopper 3 is downwardly inclined, and a cleaning plate 9 is installed on the inclined surface of the hopper 3 and faces the hopper 3. The cleaning seat 8 can be lifted and lowered along the spraying seat 4, and when the cleaning seat 8 is lowered, the inclined bottom end of the cleaning plate 9 is pressed on the cloth. When the cleaning seat 8 moves towards the hopper 3, the cleaning seat 8 can continue to be lowered along the hopper 3. The cleaning mechanism 7 further comprises a vibration assembly 10, which comprises a rotating shaft 11 installed between the cleaning plate 9 and the hopper 3, and a connecting rod structure 12 installed at the end of the cleaning plate 9. The connecting rod structure 12 can drive the cleaning plate 9 to rotate upwards on the inclined surface of the hopper 3 around the rotating shaft 11. When the cleaning plate 9 rotates downwards, it hits the inclined surface of the hopper 3 and generates vibration. The inclined end of the cleaning seat 8, on which the cleaning plate 9 is installed, is provided with a slot 13, and the cleaning plate 9 rotates in the slot around the rotating shaft 11.

[0026] In summary, when the spraying seat 4 moves towards the hopper 3 with the cleaning seat, the cleaning seat 8 will fall on the inclined bottom end of the cleaning plate 9 on the cloth surface. With the movement of the spraying seat 4 towards the hopper 3, the inclined bottom end of the cleaning plate 9 is used to clean the pile layer on the cloth surface downwards. With the movement of the cleaning plate 9 towards the upper side of the hopper 3, the cleaned pile is pushed into the hopper 3. The spraying seat 4 opens the nozzle and sprays ink on the cleaned cloth surface behind the cleaning plate 9, thereby solving the problem of surface quality defects of cotton and linen cloth, and improving the quality of such cloth products after inkjet printing, so that the cloth will not cause pattern loss due to secondary cleaning of the pile in the later use process.

[0027] As Figure 1 , Figure 2As shown, the second slide rail 14 is installed on the back side of the one end of the spray seat 4 facing the hopper 3, and the guide slot 15 is opened on the front side of the one end of the spray seat 4 facing the hopper 3, the both ends of the cleaning seat 8 are matched in the second slide rail 14 and the guide slot 15 through the slide block 16, the cleaning seat 8 can be lifted and lowered, the cleaning seat 8 can be lifted and lowered with the cleaning plate 9, and the slide block 16 provides the downward thrust to the cleaning seat 8 under the elastic support of the bottom end of the spring 18, so that the cleaning plate 9 meets the inclined bottom end falling on the cloth to provide the scraping condition for the fluff cleaning on the cloth, and also meets that the inclined bottom end of the cleaning plate 9 will not be in hard contact with the surface of the cloth, causing the damage of the cloth surface.

[0028] The both ends of the slide block 16 are matched in the second slide rail 14 and the guide slot 15, which provides the stable lifting condition for the both ends of the cleaning seat 8, the guide rod 17 forms the positioning guide to the slide block 16, which further improves the stability, the spring 18 is sleeved on the guide rod 17, the top end of the spring 18 is elastically supported on the top end of the second slide rail 14, and the bottom end of the spring 18 is elastically supported on the slide block 16, since the one end of the slide block 16 is elastically supported by the bottom end of the spring 18, the guide rod 17 forms the positioning to the spring 18, avoiding the bending of the spring 18.

[0029] The top surface of the hopper 3 is lower than the top surface of the printing machine conveying platform 1, when the cleaning seat 8 with the cleaning plate 9 travels to the upper side of the hopper 3, the cleaning seat 8 with the cleaning plate 9 is lowered along the hopper 3 under the pushing of the spring 18 to the slide block 16.

[0030] In another embodiment, as shown in FIG. 6, Figure 1 , Figure 5 and Figure 6As shown, the vibration assembly 10 further comprises a pin shaft 19 mounted at the end of the cleaning plate 9, one end of the connecting rod structure 12 is connected to the pin shaft 19, the vibration assembly 10 further comprises a reciprocating seat 20 hinged to the other end of the connecting rod structure 12, and further comprises a third sliding rail 21 fixed to the cleaning seat 8, the reciprocating seat 20 is slidingly assembled on the third sliding rail 21, and a supporting spring 24 is arranged in the third sliding rail 21, one end of the supporting spring 24 is in abutment with the third sliding rail 21, and the other end is in abutment with the reciprocating seat 20, the reciprocating seat 20 can reciprocate along the third sliding rail 21 towards the cleaning seat 8, and drive the connecting rod structure 12 to rotate the cleaning plate 9 around the rotating shaft 11 on the inclined surface of the cleaning seat 8, the vibration assembly 10 further comprises a limiting block 22 fixed to the top of the hopper 3, the limiting block 22 is located on the movement path of the reciprocating seat 20, the top of the hopper 3 is fixed with a supporting plate 23, and the limiting block 22 is fixed to the top surface of the supporting plate 23, when the reciprocating seat 20 moves to contact the limiting block 22, the cleaning seat 8 with the cleaning plate 9 reaches above the hopper 3, and when the cleaning seat 8 with the cleaning plate 9 continues to move, the reciprocating seat 20 is pressed by the limiting block 22, causing the reciprocating seat 20 to move reversely along the third sliding rail 21, the connecting rod structure 12 is reversely dragged by the reciprocating seat 20, and the cleaning plate 9 is not only pushed into the hopper 3, but also is upwardly deflected around the rotating shaft 11 by the other end of the connecting rod structure 12 when being pushed into the hopper 3.

[0031] When the cleaning seat 8 moves towards the hopper 3 with the cleaning plate 9, the inclined bottom end of the cleaning plate 9 will move along the cloth surface and clean the fluff on the cloth surface downward during the movement. When the cleaning seat 8 reaches the position above the hopper 3 and the return seat 20 touches the limiting block 22, the cleaning seat 8 continues to move, and the return seat 20 is limited by the limiting block 22 at this time. Therefore, the cleaning seat 8 will move reversely along the third sliding rail 21, and reversely drag the connecting rod structure 12. The connecting rod structure 12 rotates the cleaning plate 9 around the rotating shaft 11, the cleaning plate 9 rotates outward and leaves the inclined surface of the cleaning seat 8, and the bottom end of the cleaning plate 9 turns into the slot 13 of the cleaning seat 8. The return seat 20 will press the supporting spring 24 and compress the supporting spring 24. The supporting spring 24 stores elastic force at this time. When the cleaning seat 8 reversely moves with the cleaning plate 9, the cleaning plate 9 will leave the hopper 3, and the return seat 20 leaves the limiting block 22. The return seat 20 is no longer pressed, and the supporting spring 24 changes from compression to elastic lengthening and releases the elastic force to quickly reset the return seat 20. The connecting rod structure 12 is reset by the return seat 20, and the cleaning plate 9 is reversely rotated to the inclined surface of the cleaning seat 8 by the other end of the connecting rod structure 12. When the cleaning plate 9 reversely rotates to the inclined surface of the cleaning seat 8, a collision occurs between the cleaning plate 9 and the inclined surface of the cleaning seat 8. The collision makes the cleaning plate 9 vibrate, and the fluff remaining on the cleaning plate 9 is shaken into the hopper 3 when the cleaning plate 9 is pushed into the hopper 3. When the cleaning plate 9 reversely retreats above the cloth with the cleaning seat 8, the residual fluff on the cleaning plate 9 can be prevented from falling on the printing. The vibration effect makes the fluff processing function more reasonable.

[0032] The bottom surface of the cleaning seat 8 gradually inclines downward towards one end of the inclined surface. When the cleaning plate 9 cleans the fluff on the cloth surface by using the inclined bottom end, the bottom surface of the cleaning seat 8 will not contact the cloth surface, and only the inclined bottom end of the cleaning plate 9 will be in line contact with the cloth surface. Since the bottom surface of the cleaning seat 8 will not contact the cloth surface, the cloth surface will not be damaged or rubbed in a large area, and the fluff on the cloth surface will not appear.

[0033] As shown in Figure 4 , Figure 5 , the inner cavity bottom surface of the hopper 3 gradually inclines downward towards one end. An outlet will be arranged on the inclined end of the bottom surface of the hopper 3 during actual assembly, and a discharge pipe will be installed on the outlet to facilitate regular discharge of the fluff from the hopper 3.

[0034] A control method of a liquid spraying device, the control method comprising: setting a time of a control module in a control system of a digital printing machine, the time controlling a transmission mechanism of the digital printing machine, and the transmission mechanism driving the liquid spraying device 2 to move to above the hopper 3.

[0035] The control method further comprises setting a distance sensor in the third slide rail 21, the distance sensor controls the back and forth switching between the forward and reverse directions of the motor in the transmission mechanism, when the complex seat 20 moves reversely along the third slide rail 21 to approach the distance sensor, the distance sensor sends a signal to the motor, the motor reverses and drives the liquid spraying device 2 to reversely return from above the hopper 3 to the other side of the cloth through the transmission mechanism.

[0036] The transmission mechanism mentioned in the method is installed on the printing machine, such as screw rod, slide rail, motor, etc., the liquid spraying device 2 is assembled on the transmission mechanism through the first slide rail 5 on the back of the spraying seat 4 and the transmission seat 6, for example, when the motor rotates forward, the transmission seat 6 is driven to rotate through the screw rod, the spraying seat 4 is driven to move linearly in the width direction of the cloth by the transmission seat 6, the whole liquid spraying device 2 is driven to move linearly in the width direction of the cloth by the spraying seat 4, this transmission mode of the liquid spraying device 2 is the prior art, and the assembly relationship with the printing machine and the structure are omitted.

[0037] The above orientation reference does not represent the specific orientation of each component in the embodiment, the embodiment is only for the convenience of the description of the scheme, and the relative description is set by referring to the orientation in the figure, and the specific orientation of each component is according to the actual installation and the actual use and the orientation description habit of the person skilled in the art, and it is hereby stated.

[0038] The above specific embodiments further specifically describe the purposes, technical schemes and beneficial effects of the application. It should be understood that the above description is only a specific embodiment of the application and does not limit the protection scope of the application. It is particularly pointed out that any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principles of the application should be included in the protection scope of the application.

Claims

1. A liquid spraying device for a digital printing machine, characterized in that: The invention comprises a printing machine conveying platform (1), a liquid spraying device (2) arranged above the printing machine conveying platform (1), and a hopper (3) connected to one end of the printing machine conveying platform (1), wherein the liquid spraying device (2) comprises a spray seat (4), a first slide rail (5) and a transmission seat (6) are provided on the back of the spray seat (4), and the spray seat (4) is installed on the discharge port of the printing machine through the first slide rail (5) and the transmission seat (6) on the back, so that the spray seat (4) can move back and forth in the direction of the hopper (3) above the printing machine conveying platform (1); a cleaning mechanism (7) is installed on one end of the spray seat (4) facing the hopper (3), and the cleaning mechanism (7) comprises a cleaning seat installed on the hopper (3). (8), the cleaning seat (8) is tilted downwardly on one side facing the hopper (3), and a cleaning plate (9) is installed on the inclined surface of the hopper (3), the cleaning plate (9) faces the hopper (3), the cleaning seat (8) can be raised and lowered along the spray seat (4), and the inclined bottom end of the cleaning plate (9) is pressed against the cloth when the cleaning seat (8) descends, and the cleaning seat (8) can continue to descend along the hopper (3) when it moves toward the hopper (3), and the cleaning mechanism (7) also includes a vibration component (10), and the vibration component (10) includes a rotating shaft (11) installed between the cleaning plate (9) and the hopper (3), and also includes a connecting rod structure (12) installed at the end of the cleaning plate (9); The vibration assembly (10) further includes a pin shaft (19) mounted on the end of the cleaning plate (9), one end of the connecting rod structure (12) is connected to the pin shaft (19), the vibration assembly (10) further includes a reciprocating seat (20) hinged on the other end of the connecting rod structure (12), and a third slide rail (21) fixed on the cleaning seat (8), the reciprocating seat (20) is slidably assembled on the third slide rail (21), a support spring (24) is provided in the third slide rail (21), one end of the support spring (24) is pressed against the third slide rail (21), and the other end is pressed against the reciprocating seat (20), the reciprocating seat (20) can reciprocate along the third slide rail (21) toward the cleaning seat (8), and link the connecting rod structure (12) to drive the cleaning plate (9) to rotate around the rotating shaft (11) on the inclined surface of the cleaning seat (8); The connecting rod structure (12) can drive the cleaning plate (9) to rotate upward on the inclined surface of the hopper (3) around the rotating shaft (11); when the cleaning plate (9) rotates downward, it hits the inclined surface of the hopper (3) and generates vibration; and a notch (13) is provided at one end of the inclined surface of the cleaning seat (8) on which the cleaning plate (9) is mounted.

2. The liquid spraying device of the digital printing machine according to claim 1, characterized in that: A second slide rail (14) is installed on the rear side of one end of the spray seat (4) facing the hopper (3), and a guide groove (15) is provided on the front side of one end of the spray seat (4) facing the hopper (3). The two ends of the cleaning seat (8) are engaged in the second slide rail (14) and the guide groove (15) through sliders (16). The second slide rail (14) is filled with a guide rod (17). The slider (16) at the same side end of the spray seat (4) is slidably engaged on the guide rod (17). A spring (18) is sleeved on the guide rod (17). The top end of the spring (18) is elastically supported on the top end of the second slide rail (14), and the bottom end of the spring (18) is elastically supported on the slider (16).

3. The liquid spraying device of the digital printing machine according to claim 2, characterized in that: The top surface of the hopper (3) is lower than the top surface of the printing machine conveying platform (1). When the cleaning seat (8) moves with the cleaning plate (9) to the top of the hopper (3), the spring (18) pushes the slider (16), so that the cleaning seat (8) and the cleaning plate (9) descend along the material opening of the hopper (3).

4. The liquid spraying device of the digital printing machine according to claim 3, characterized in that: The bottom surface of the cleaning seat (8) gradually slopes downward toward one end of the inclined surface.

5. The liquid spraying device of the digital printing machine according to claim 4, characterized in that: The bottom surface of the inner cavity of the hopper (3) gradually slopes downward toward one end.

6. The liquid spraying device of the digital printing machine according to claim 5, characterized in that: The vibration assembly (10) further comprises a limit block (22) fixed to the top of the hopper (3), wherein the limit block (22) is located on the movement path of the reciprocating seat (20).

7. The liquid spraying device of the digital printing machine according to claim 6, characterized in that: A carrier plate (23) is fixed on the top of the hopper (3), and the limit block (22) is fixed on the top surface of the carrier plate (23). When the reciprocating seat (20) moves to contact the limit block (22), the cleaning seat (8) brings the cleaning plate (9) to the top of the hopper (3).

8. A method for controlling a liquid spraying device, adapted for the liquid spraying device of a digital printing machine according to claim 7, characterized in that: The following steps are involved: Setting a time in a control module in a control system of the digital printing machine, wherein the time controls a transmission mechanism of the digital printing machine, and the transmission mechanism drives the liquid spraying device (2) to move above the hopper (3); The control method further includes arranging a distance sensor in the third slide rail (21), and the distance sensor controls the switching between forward and reverse directions of the motor in the transmission mechanism. When the reciprocating seat (20) moves in the reverse direction along the third slide rail (21) to approach the distance sensor, the distance sensor sends a signal to the motor, and the motor reverses and drives the liquid spraying device (2) to return from the top of the hopper (3) to the other side of the cloth through the transmission mechanism.

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