A rotary screen printing machine

Abstract

The application relates to the technical field of printing processes, in particular to a rotary screen printing machine. The rotary screen printing machine comprises a machine body, more than one rotary screen printing roller is rotationally arranged on the machine body, the plurality of rotary screen printing rollers are equidistantly arranged on the machine body along the transport direction of polyester fabric, a scraper assembly and a flushing assembly are detachably arranged in the rotary screen printing roller, the scraper assembly and the flushing assembly are arranged in the rotary screen printing roller in an axial direction, the scraper assembly is used for scraping off the excess color paste in the rotary screen printing roller, the flushing assembly is used for flushing the color paste in the rotary screen printing roller, and the flushing assembly and the scraper assembly are both connected to the rotary screen printing roller in a reciprocating sliding mode and can be positioned in the axial direction of the rotary screen printing roller. The application has the following effects: after a batch of polyester fabric is completed with printing, the color paste scraper is removed, the scraper assembly and the flushing assembly are arranged in the rotary screen printing roller, the probability of mutual influence of the cleaning and scraping structure and the color paste scraper is reduced, and the printing effect is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of printing processes, in particular to a rotary screen printing machine. BACKGROUND

[0002] A rotary screen printing machine is needed in the development process of a short-flow printing process without steaming and washing for polyester fabrics.

[0003] A rotary screen printing machine is disclosed in the Chinese Utility Model Patent with the authorization announcement No. CN203807758U, which comprises a machine body, a conveying belt arranged on the machine body and a plurality of rotary screen printing rollers arranged on the machine body. The axis direction of the rotary screen printing rollers is perpendicular to the conveying direction of the conveying belt. The plurality of rotary screen printing rollers are arranged above the conveying belt along the conveying direction of the conveying belt. A cleaning structure is arranged on the machine body and located in the rotary screen printing roller. The cleaning structure slides along the axis direction of the rotary screen printing roller. A color paste recovery tank is arranged on the machine body and used for receiving the color paste on the rotary screen printing roller. The application has the following effects: the color paste on the inner wall of the rotary screen printing roller is cleaned by the cleaning structure sliding in the rotary screen printing roller. The color paste cleaned by the cleaning structure is received by the color paste recovery tank. The utilization rate of the printing color paste is improved, and the waste of the printing color paste is reduced.

[0004] However, the setting of the cleaning structure and the setting of the color paste scraper may interfere with each other, which affects the printing effect in the printing process. SUMMARY

[0005] In order to reduce the probability of mutual influence of the cleaning structure and the color paste scraper and improve the printing effect, the application provides a rotary screen printing machine.

[0006] The rotary screen printing machine provided by the application adopts the following technical scheme: comprising a machine body, more than one rotary screen printing roller is rotatably arranged on the machine body, a plurality of rotary screen printing rollers are equidistantly and spacedly arranged on the machine body along the conveying direction of the polyester fabric, a scraper assembly and a flushing assembly are detachably arranged in the rotary screen printing roller, the scraper assembly and the flushing assembly are spacedly arranged in the rotary screen printing roller along the axis direction of the rotary screen printing roller, the scraper assembly is used for scraping off the excess color paste in the rotary screen printing roller, the flushing assembly is used for flushing the color paste in the rotary screen printing roller, and the flushing assembly and the scraper assembly are both positionally and reciprocally slidably connected to the rotary screen printing roller along the axis direction of the rotary screen printing roller.

[0007] By adopting the above technical solution, the doctor blade assembly scrapes off excess ink from the rotary screen printing roller during its reciprocating sliding motion along the axial direction of the roller; the washing assembly washes away the ink from the roller during its reciprocating sliding motion along the axial direction of the roller. Since both the doctor blade assembly and the washing assembly are detachably connected to the rotary screen printing roller, they can be removed during the printing process. After a batch of polyester fabrics has been printed, the ink doctor blade is removed, and the doctor blade assembly and the washing assembly are installed back into the rotary screen printing roller, reducing the probability of mutual interference between the cleaning structure and the ink doctor blade, and improving the printing effect.

[0008] Preferably, the rotary screen printing roller includes a mounting column and a printing sleeve for fitting onto the mounting column. A printing motor is provided on the machine body. The output shaft of the printing motor is coaxially connected to the end of the mounting column away from the printing sleeve. The printing sleeve and the mounting column are detachably connected by a positioning member.

[0009] By adopting the above technical solution, the printing sleeve can be removed, which makes it easier for operators to disassemble and assemble the color paste scraper, scraper assembly and rinsing assembly.

[0010] Preferably, an operating table is detachably provided inside the rotary screen printing roller. The squeegee assembly and the rinsing assembly are both disposed on the operating table. A relief notch is provided on the operating table along the radial direction of the rotary screen printing roller for the squeegee assembly and the rinsing assembly to pass through. The operating table is provided with a driving member for driving the squeegee assembly and the rinsing assembly to reciprocate and slide along the axial direction of the rotary screen printing roller.

[0011] By adopting the above technical solution, the disassembly control panel can be used to disassemble the scraper assembly and the rinsing assembly. The drive unit can drive both the scraper assembly and the rinsing assembly to slide back and forth, which is quite convenient.

[0012] Preferably, the operating table has a connecting column extending coaxially from one end near the mounting column, and the mounting column has a connecting groove for the connecting column to be embedded at one end near the printing sleeve. The connecting column has an external thread on its peripheral wall, and the connecting groove has an internal thread that matches the external thread on its groove wall.

[0013] By adopting the above technical solution, the external thread on the peripheral wall of the connecting column and the internal thread on the wall of the connecting groove are matched to achieve a detachable connection between the operating table and the mounting column.

[0014] Preferably, the rinsing assembly includes a rinsing cylindrical seat and a plurality of rinsing nozzles. The rinsing cylindrical seat is coaxially disposed inside the rotary screen printing roller. The rinsing cylindrical seat is axially and reciprocally slidably connected to the operating table. One end of each rinsing nozzle is connected to the rinsing cylindrical seat, and the other end of each rinsing nozzle is radially toward the inner wall of the printing sleeve along the rotary screen printing roller. The plurality of rinsing nozzles are equidistantly spaced on the circumferential wall of the rinsing cylindrical seat along the circumference of the rotary screen printing roller.

[0015] By adopting the above technical solution, multiple rinsing nozzles are arranged at equal angles along the circumference of the rinsing cylinder seat, which improves the rinsing effect of the rinsing assembly on the ink paste inside the rotary screen printing roller to a certain extent.

[0016] Preferably, the squeegee assembly includes a squeegee holder and more than one squeegee blade. The squeegee holder is coaxially disposed inside the rotary screen printing roller. The squeegee holder is axially and reciprocally slidably connected to the operating table. The inner arc surface of the squeegee blade is used to connect with the squeegee holder, and the outer arc surface of the squeegee blade is used to abut against the inner wall of the printing sleeve. The plurality of squeegee blades are arranged end-to-end on the squeegee holder circumferentially.

[0017] By adopting the above technical solution, multiple scraper blades are provided to reduce the probability of damage to the scraper blades during the scraping of pigment paste.

[0018] Preferably, the driving component includes a drive screw and a screw motor. The screw motor is mounted on the side wall of the operating table away from the mounting column. One end of the drive screw is circumferentially and axially fixedly connected to the side wall of the relief notch near the mounting column. The other end of the drive screw passes sequentially through the rinsing cylindrical seat and the doctor blade seat along the axial direction of the rotary screen printing roller, and then passes through the side wall of the relief notch away from the mounting column, coaxially connected to the output shaft of the screw motor. A guide rod is provided on the operating table. The length direction of the guide rod is parallel to the length direction of the drive screw. Both ends of the guide rod are respectively connected to the inner walls of the opposite side of the relief notch, and the guide rod passes sequentially through the rinsing cylindrical seat and the doctor blade seat along the axial direction of the rotary screen printing roller.

[0019] By adopting the above technical solution, the screw motor drives the screw to rotate. Since the screw is circumferentially rotated and axially fixedly connected to the side wall of the relief notch, the screw rotation drives the washing assembly and the doctor blade assembly to reciprocate along the axial direction of the rotary screen printing roller.

[0020] Preferably, the flushing cylindrical seat has a flushing fluid storage cavity, and one end of each of the flushing nozzles near the flushing cylindrical seat is connected to the flushing fluid storage cavity. A liquid filling column is provided on one end face of the flushing cylindrical seat, one end of the liquid filling column is connected to the flushing fluid storage cavity, and a liquid filling column cover is fitted on the other end of the liquid filling column. The outer wall of the liquid filling column is threadedly connected to the inner wall of the liquid filling column cover.

[0021] By adopting the above technical solution, the flushing liquid can be replenished into the flushing liquid storage chamber in a timely manner by opening the liquid filling column cover, ensuring that the flushing nozzle can spray flushing liquid onto the inner wall of the printing sleeve in real time.

[0022] Preferably, the squeegee holder has more than one squeegee retraction cavity along the radial direction of the rotary screen printing roller. Each squeegee retraction cavity corresponds to a squeegee blade. The squeegee blade can be positioned and reciprocated along the radial direction of the rotary screen printing roller. When the squeegee assembly is used to scrape off excess ink in the rotary screen printing roller, part of the squeegee blade is exposed in the squeegee retraction cavity and the outer arc surface of the squeegee blade abuts against the inner wall of the printing sleeve. When the operating table is disassembled, the squeegee blade is stored in the squeegee retraction cavity.

[0023] By adopting the above technical solution, when the doctor blade assembly is used to scrape off excess ink from the rotary screen printing roller, the doctor blade is partially exposed in the doctor blade retraction cavity and the outer arc surface of the doctor blade abuts against the inner wall of the printing sleeve. When the operating table is disassembled, the doctor blade is stored in the doctor blade retraction cavity.

[0024] Preferably, an elastic limiting block is provided on one side wall of the doctor blade, and two limiting ports are provided through one side wall of the doctor blade retraction cavity for the elastic limiting block to slide and be embedded, and the two limiting ports are opened at a distance along the radial direction of the rotary screen printing roller.

[0025] By adopting the above technical solution, the elastic limiting block is embedded in the limiting opening, and a fixed relationship is formed between the doctor blade and the doctor blade holder; when the elastic limiting block is embedded in the limiting opening near the central axis, the doctor blade is housed in the doctor blade retraction cavity; when the elastic limiting block is embedded in the limiting opening away from the central axis, the doctor blade is exposed in the doctor blade retraction cavity to scrape off the color paste on the inner wall of the printing sleeve.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. During the printing process, the squeegee assembly and the rinsing assembly are removed; after a batch of polyester fabrics has finished printing, the color paste squeegee is removed and the squeegee assembly and the rinsing assembly are installed in the rotary screen printing roller to reduce the probability of mutual interference between the cleaning structure and the color paste squeegee and improve the printing effect.

[0028] 2. Opening the liquid filling column cover allows for timely replenishment of the rinsing liquid storage chamber, ensuring that the rinsing nozzle can spray rinsing liquid onto the inner wall of the printing sleeve in real time. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of this application;

[0030] Figure 2 This is an exploded view of a portion of the structure of this application;

[0031] Figure 3 This is a partial structural diagram of this application;

[0032] Figure 4 This is a cross-sectional schematic diagram of a portion of the structure of this application;

[0033] Figure 5 This is a cross-sectional schematic diagram of a portion of the structure of this application.

[0034] Explanation of reference numerals in the attached drawings: 110, machine body; 111, rotary screen printing roller; 1111, mounting column; 1112, printing sleeve; 112, conveyor belt; 113, mounting plate; 114, printing motor; 115, collecting cylinder; 116, collecting box; 117, positioning component; 1171, return spring; 1172, positioning ball; 118, positioning hole; 119, inserting groove; 120, doctor blade assembly; 1201, doctor blade holder; 1202, doctor blade; 121, doctor blade retraction cavity; 122, elastic limit block; 12 21. Limiting block; 122. Tension spring; 123. Limiting groove; 124. Limiting port; 125. Paddle; 126. Paddle groove; 130. Flushing assembly; 1301. Flushing cylindrical seat; 1302. Flushing nozzle; 131. Liquid filling column; 132. Liquid filling column cover; 140. Operating table; 141. Recessed notch; 142. Connecting column; 143. Connecting groove; 144. External thread; 145. Internal thread; 146. Driving component; 1461. Driving screw; 1462. Screw motor; 147. Guide rod. Detailed Implementation

[0035] The present application will be further described in detail below with reference to the accompanying drawings.

[0036] This application discloses a rotary screen printing machine for reducing the probability of mutual interference between the cleaning structure and the pigment squeegee, thereby improving the printing effect.

[0037] refer to Figure 1 , Figure 2 , Figure 3A rotary screen printing machine includes a machine body 110. More than one rotary screen printing roller 111 is rotatably mounted on the machine body 110. A squeegee assembly 120 and a rinsing assembly 130 are detachably mounted inside each rotary screen printing roller 111. The squeegee assembly 120 and the rinsing assembly 130 are spaced apart along the axial direction of the rotary screen printing roller 111. The squeegee assembly 120 is used to scrape off excess ink from the rotary screen printing roller 111, and the rinsing assembly 130 is used to rinse the ink out of the rotary screen printing roller 111. In this embodiment, a conveyor belt 112 is provided on the machine body 110. The length direction of the conveyor belt 112 is along the transport direction of the polyester fabric, and the conveyor belt 112 is inclined. A mounting plate 113 is provided on one side of the machine body 110, and the mounting plate 113 is located away from the rotary screen printing roller 111. A printing motor 114 is installed on the side wall, and five rotary screen printing rollers 111 are installed. The five rotary screen printing rollers 111 are evenly spaced on the machine body 110 along the polyester fabric transport direction. The printing motor 114 and the rotary screen printing rollers 111 are arranged one-to-one, with a total of five. The output shaft of the printing motor 114 passes through the mounting plate 113 and is coaxially connected to the rotary screen printing rollers 111. Five collection cylinders 115 are installed on the machine body 110. The five collection cylinders 115 correspond one-to-one with the five rotary screen printing rollers 111 and are located at one end of the rotary screen printing rollers 111 to receive excess ink and rinsing liquid in the rotary screen printing rollers 111. A collection box 116 with an open top is installed on the side of the conveyor belt 112 with a lower height. The ink and rinsing liquid flow into the collection box 116 along the transport direction of the conveyor belt 112.

[0038] Specifically, refer to Figure 2 , Figure 4The rotary screen printing roller 111 includes a mounting post 1111 and a printing sleeve 1112 for fitting onto the mounting post 1111. The output shaft of the printing motor 114 passes through the mounting plate 113 and is coaxially connected to the end of the mounting post 1111 away from the printing sleeve 1112. The printing sleeve 1112 and the mounting post 1111 are detachably connected by positioning members 117. In this embodiment, the positioning members 117 are provided on the peripheral wall of the mounting post 1111. There are four positioning members 117 in total, and the four positioning members 117 are equally spaced along the peripheral wall of the mounting post 1111. The cylindrical wall of the printing sleeve 1112 has four positioning holes 118 for the four positioning members 117 to be fitted into. 118 is opened at equal angles along the circumference of the printing sleeve 1112. The positioning element 117 includes a return spring 1171 and a positioning ball 1172. The mounting post 1111 has a mounting groove 119 on its peripheral wall along the radial direction of the rotary screen printing roller 111 for the positioning element 117 to be embedded. One end of the return spring 1171 is connected to the bottom of the mounting groove 119, and the other end of the return spring 1171 is connected to the positioning ball 1172. The positioning ball 1172 is partially embedded in the mounting groove 119. When the printing sleeve 1112 is sleeved onto the mounting post 1111, when the positioning ball 1172 matches the positioning hole 118 one by one, the rebound force of the return spring 1171 causes the positioning ball 1172 to be embedded in the positioning hole 118.

[0039] Further, refer to Figure 2 An operating table 140 is detachably installed inside the rotary screen printing roller 111. The squeegee assembly 120 and the rinsing assembly 130 are both installed on the operating table 140. A relief notch 141 is provided on the operating table 140 radially through the rotary screen printing roller 111 for the squeegee assembly 120 and the rinsing assembly 130 to pass through. A connecting post 142 extends coaxially from one end of the operating table 140 near the mounting post 1111. A connecting groove 143 is provided at one end of the mounting post 1111 near the printing sleeve 1112 for the connecting post 142 to be embedded. An external thread 144 is provided on the peripheral wall of the connecting post 142. An internal thread 145 is provided on the groove wall of the connecting groove 143 to match the external thread 144, thereby realizing a detachable connection between the operating table 140 and the mounting post 1111.

[0040] refer to Figure 1 , Figure 2The operating table 140 is provided with a drive component 146 for driving the doctor blade assembly 120 and the washing assembly 130 to reciprocate and slide along the axial direction of the rotary screen printing roller 111. The drive component 146 includes a drive screw 1461 and a screw motor 1462. The screw motor 1462 is located on the side wall of the operating table 140 away from the mounting post 1111. One end of the drive screw 1461 is circumferentially rotated and axially fixedly connected to the side wall of the relief notch 141 near the mounting post 1111. The other end of the drive screw 1461 passes through the side wall of the relief notch 141 away from the mounting post 1111 and is coaxially connected to the output shaft of the screw motor 1462.

[0041] refer to Figure 2 , Figure 3 Specifically, the doctor blade assembly 120 includes a doctor blade holder 1201 and more than one doctor blade 1202. The rinsing assembly 130 includes a rinsing cylindrical seat 1301 and multiple rinsing nozzles 1302. The doctor blade holder 1201 and the rinsing cylindrical seat 1301 are coaxially arranged inside the rotary screen printing roller 111. The drive screw 1461 passes through the doctor blade holder 1201 and the rinsing cylindrical seat 1301 in sequence along the axial direction of the rotary screen printing roller 111. The screw motor 1462 drives the drive screw 1461 to rotate. Since the drive screw 1461 is circumferentially rotated and axially fixedly connected to the side wall of the relief notch 141, the rotation of the drive screw 1461 drives the rinsing assembly 130 and the doctor blade assembly 120 to reciprocate and slide along the axial direction of the rotary screen printing roller 111 in a positionable manner.

[0042] Furthermore, a guide rod 147 is provided on the operating table 140. The length direction of the guide rod 147 is parallel to the length direction of the drive screw 1461. The two ends of the guide rod 147 are respectively connected to the inner walls of the opposite side of the relief notch 141, and the guide rod 147 passes through the washing cylinder seat 1301 and the doctor blade seat 1201 in sequence along the axial direction of the rotary screen printing roller 111.

[0043] refer to Figure 1 , Figure 3In this embodiment, four doctor blades 1202 are provided, which are connected end-to-end along the circumference of the doctor blade holder 1201. The inner arc surface of the doctor blade 1202 is used to connect with the doctor blade holder 1201, and the outer arc surface of the doctor blade 1202 is used to abut against the inner wall of the printing sleeve 1112. Multiple rinsing nozzles 1302 are equally spaced along the circumference of the rotary screen printing roller 111 on the circumferential wall of the rinsing cylindrical seat 1301. The rinsing cylindrical seat 1301 has a rinsing liquid storage cavity. The multiple rinsing nozzles 1302 are close to the rinsing cylindrical seat 1301. One end of each is connected to the rinsing liquid storage chamber. The other end of the rinsing nozzle 1302 is radially toward the inner wall of the printing sleeve 1112 along the rotary screen printing roller 111. A liquid-filling column 131 is provided on one end face of the rinsing cylindrical seat 1301. One end of the liquid-filling column 131 is connected to the rinsing liquid storage chamber. A liquid-filling column cover 132 is fitted on the other end of the liquid-filling column 131. The outer wall of the liquid-filling column 131 is threadedly connected to the inner wall of the liquid-filling column cover 132. Opening the liquid-filling column cover 132 can replenish the rinsing liquid in the rinsing liquid storage chamber in time, ensuring that the rinsing nozzle 1302 can spray rinsing liquid toward the inner wall of the printing sleeve 1112 in real time.

[0044] refer to Figure 1 , Figure 3 , Figure 5 Furthermore, four squeegee retraction cavities 121 are radially formed on the squeegee holder 1201 along the rotary screen printing roller 111. Each squeegee retraction cavity 121 corresponds to a squeegee blade 1202. The squeegee blade 1202 reciprocates radially along the rotary screen printing roller 111. An elastic limiting block 122 is provided on one side wall of the squeegee blade 1202. The elastic limiting block 122 includes a limiting block 1221 and a tension spring 1222. A limiting groove 123 is formed on one side wall of the squeegee blade 1202 along the axial direction of the rotary screen printing roller 111 for the elastic limiting block 122 to slide into. One end of the tension spring 1222 is connected to the bottom of the limiting groove 123. The other end is connected to the limiting block 1221. The limiting block 1221 is partially embedded in the limiting groove 123. Two limiting ports 124 for the limiting block 1221 to slide and be embedded are penetrated on one side of the cavity wall of the squeegee retraction cavity 121. The two limiting ports 124 are radially spaced along the rotary screen printing roller 111. When the squeegee assembly 120 is used to scrape off excess ink in the rotary screen printing roller 111, the limiting block 1221 is embedded in the limiting port 124 located away from the central axis. When the operating table 140 is disassembled, the squeegee blade 1202 is stored in the squeegee retraction cavity 121 to reduce the probability of scratching the operator. At this time, the limiting block 1221 is embedded in the limiting port 124 located near the central axis.

[0045] Furthermore, each doctor blade 1202 has a lever 125 on the side wall away from the elastic limiting block 122 along the axial direction of the rotary screen printing roller 111. Each doctor blade retraction cavity 121 has a groove 126 on the side wall away from the limiting port 124 for the lever 125 to slide back and forth radially along the rotary screen printing roller 111. The lever 125 is partially exposed in the groove 126 along the axial direction of the rotary screen printing roller 111, which makes it easy for the operator to adjust whether the doctor blade 1202 is retracted into the doctor blade retraction cavity 121.

[0046] The implementation principle of a rotary screen printing machine according to an embodiment of this application is as follows: During the reciprocating sliding of the squeegee assembly 120 along the axial direction of the rotary screen printing roller 111, excess ink paste inside the rotary screen printing roller 111 is scraped off; During the reciprocating sliding of the rinsing assembly 130 along the axial direction of the rotary screen printing roller 111, the ink paste inside the rotary screen printing roller 111 is rinsed clean; Since both the squeegee assembly 120 and the rinsing assembly 130 are detachably connected to the rotary screen printing roller 111, the squeegee assembly 120 and the rinsing assembly 130 are removed during the printing process; After a batch of polyester fabrics has completed the printing process, the ink paste squeegee is removed and the squeegee assembly 120 and the rinsing assembly 130 are installed inside the rotary screen printing roller 111, reducing the probability of mutual interference between the cleaning structure and the ink paste squeegee, and improving the printing effect.

[0047] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rotary screen printing machine, comprising a machine body (110), more than one rotary screen printing roller (111) is rotatably arranged on the machine body (110), and a plurality of the rotary screen printing rollers (111) are equidistantly arranged on the machine body (110) along a direction of transportation of polyester fabric, characterized in that: The circular screen printing roller (111) is detachably provided with a scraper assembly (120) and a flushing assembly (130), the scraper assembly (120) and the flushing assembly (130) are arranged in the circular screen printing roller (111) in an axial direction and are spaced apart from each other, the scraper assembly (120) is used for scraping off the excess color paste in the circular screen printing roller (111), the flushing assembly (130) is used for flushing the color paste in the circular screen printing roller (111), and the flushing assembly (130) and the scraper assembly (120) are connected to the circular screen printing roller (111) in an axially positionable reciprocating sliding mode; during the printing work, the scraper assembly (120) and the flushing assembly (130) are detached; after a batch of polyester fabrics is completed, the color paste scraper is removed, and the scraper assembly (120) and the flushing assembly (130) are installed in the circular screen printing roller (111), so that the mutual influence probability of the cleaning and scraping structure and the color paste scraper is reduced.

2. A rotary screen printing machine according to claim 1, characterised in that: The circular screen printing roller (111) comprises a mounting column (1111) and a printing sleeve (1112) arranged on the mounting column (1111), the machine body (110) is provided with a printing motor (114), an output shaft of the printing motor (114) is coaxially connected to one end of the mounting column (1111) away from the printing sleeve (1112), and the printing sleeve (1112) and the mounting column (1111) are detachably connected through a positioning piece (117).

3. A rotary screen printing machine according to claim 2, characterised in that: The circular screen printing roller (111) is detachably provided with an operating table (140), the scraper assembly (120) and the flushing assembly (130) are arranged on the operating table (140), the operating table (140) is provided with a retreat gap (141) penetrating in a radial direction of the circular screen printing roller (111) and allowing the scraper assembly (120) and the flushing assembly (130) to pass through, and the operating table (140) is provided with a driving piece (146) for driving the scraper assembly (120) and the flushing assembly (130) to axially positionally reciprocate along the circular screen printing roller (111).

4. A rotary screen printing machine according to claim 3, characterised in that: The operating table (140) coaxially extends a connecting column (142) from one end close to the mounting column (1111), the mounting column (1111) is provided with a connecting groove (143) for embedding the connecting column (142) at one end close to the printing sleeve (1112), an outer thread (144) is formed on a peripheral wall of the connecting column (142), and an inner thread (145) matched with the outer thread (144) is formed on a groove wall of the connecting groove (143).

5. A rotary screen printing machine according to claim 4, characterised in that: The flushing assembly (130) comprises a flushing cylinder seat (1301) and a plurality of flushing nozzles (1302), the flushing cylinder seat (1301) is coaxially arranged in the rotary screen printing roller (111), the flushing cylinder seat (1301) is connected to the operation table (140) in a reciprocating sliding manner along the rotary screen printing roller (111) in an axially positionable manner, one end of the flushing nozzle (1302) is connected to the flushing cylinder seat (1301), the other end of the flushing nozzle (1302) is radially arranged towards the inner wall of the printing sleeve (1112) along the rotary screen printing roller (111), and a plurality of the flushing nozzles (1302) are arranged on the peripheral wall of the flushing cylinder seat (1301) at equal angles along the rotary screen printing roller (111).

6. A rotary screen printing machine according to claim 5, characterised in that: The scraper assembly (120) comprises a scraper seat (1201) and more than one scraper blade (1202), the scraper seat (1201) is coaxially arranged in the rotary screen printing roller (111), the scraper seat (1201) is connected to the operation table (140) in a reciprocating sliding manner along the rotary screen printing roller (111) in an axially positionable manner, the inner arc surface of the scraper blade (1202) is used for being connected to the scraper seat (1201), the outer arc surface of the scraper blade (1202) is used for abutting against the inner wall of the printing sleeve (1112), and a plurality of the scraper blades (1202) are arranged on the scraper seat (1201) in a head-to-tail manner along the peripheral direction of the scraper seat (1201).

7. A rotary screen printing machine according to claim 6, characterised in that: The driving member (146) comprises a driving lead screw (1461) and a lead screw motor (1462), the lead screw motor (1462) is arranged on the side wall of the operation table (140) away from the mounting column (1111), one end of the driving lead screw (1461) is connected to the retreat gap (141) in a circumferential rotating and axial fixing manner on the side wall close to the mounting column (1111), the other end of the driving lead screw (1461) sequentially passes through the flushing cylinder seat (1301) and the scraper seat (1201) along the rotary screen printing roller (111) in an axial direction, and then passes through the retreat gap (141) on the side wall away from the mounting column (1111) and is coaxially connected to the output shaft of the lead screw motor (1462), a guide rod (147) is arranged on the operation table (140), the length direction of the guide rod (147) is parallel to the length direction of the driving lead screw (1461), and both ends of the guide rod (147) are connected to the inner walls of the opposite sides of the retreat gap (141) and sequentially pass through the flushing cylinder seat (1301) and the scraper seat (1201) along the rotary screen printing roller (111) in an axial direction.

8. A rotary screen printing machine according to claim 7, characterised in that: The flushing cylindrical seat (1301) is provided with a flushing liquid storage cavity, a plurality of flushing nozzles (1302) are arranged near one end of the flushing cylindrical seat (1301) and are communicated with the flushing liquid storage cavity, a liquid adding column (131) is arranged on the end face of one end of the flushing cylindrical seat (1301), one end of the liquid adding column (131) is communicated with the flushing liquid storage cavity, and the other end of the liquid adding column (131) is sleeved with a liquid adding column cover (132), and the outer wall of the liquid adding column (131) is threadedly connected with the inner wall of the liquid adding column cover (132).

9. A rotary screen printing machine according to claim 8, characterised in that: The scraper seat (1201) is provided with more than one scraper retreat cavity (121) along the radial direction of the rotary screen printing roller (111), the scraper retreat cavity (121) is in one-to-one correspondence with the scraper blade (1202), the scraper blade (1202) can be positioned and reciprocally slid along the radial direction of the rotary screen printing roller (111), when the scraper assembly (120) is used for scraping the excess color paste in the rotary screen printing roller, the scraper blade (1202) is partially exposed from the scraper retreat cavity (121), and the outer arc surface of the scraper blade (1202) abuts against the inner wall of the printing sleeve (1112), when the operation table (140) is disassembled, the scraper blade (1202) is accommodated in the scraper retreat cavity (121).

10. A rotary screen printing machine according to claim 9, characterised in that: An elastic limiting block (122) is arranged on one side wall of the scraper blade (1202), two limiting openings (124) for slidingly embedding the elastic limiting block (122) are arranged on one side wall of the scraper retreat cavity (121), and the two limiting openings (124) are arranged at intervals along the radial direction of the rotary screen printing roller (111).

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