Rotary screen printing machine

Abstract

The invention relates to the field of printing equipment, in particular to a rotary screen printing machine which comprises a support, a conveying belt arranged on the support and a cleaning device used for cleaning the conveying belt, a plurality of rotary screens are arranged on the support and located above the conveying belt, and the rotary screens are arranged in the length direction of the support. The cleaning device comprises a first spray pipe and a placing frame, the placing frame is arranged on one side of the support, the placing frame is used for placing the first spray pipe, one end of the first spray pipe is connected with a water source, the other end of the first spray pipe is connected with a transfer pipe, the other end of the transfer pipe is connected with an atomizing nozzle, and a pressurizing piece is arranged on the transfer pipe. The conveying belt is cleaned, so that the quality of finished products is improved.

Description

Technical Field

[0001] The present application relates to the field of printing equipment, and in particular to a rotary screen printing machine. Background Art

[0002] Rotary screen printing machines have a dominant position in the textile printing industry due to their high printing speed and good production efficiency. With the rapid development of the textile industry, more and more companies choose to use rotary screen printing machines to produce fabric products with exquisite patterns, which not only increases the added value of the products, but also meets the market demand for personalized, high-quality printed fabrics. However, behind the efficient production is the increase in the complexity and technical requirements of the printing and dyeing process, especially the challenge of ensuring the stability of product quality is becoming increasingly prominent.

[0003] At present, the common rotary screen printing machines on the market generally use mesh conveyor belts to transport the fabrics to be printed. The conveyor belt design is designed to effectively cooperate with the printing process and improve the working efficiency. During the operation of this type of machine, in order to allow the fabrics to pass through the printing area smoothly, a mesh conveyor belt is generally configured on the machine bracket; at the same time, a special printing component is installed just above the conveyor belt to ensure that the fabrics to be processed can be accurately positioned and pass through the printing area to complete the printing process.

[0004] In the traditional way, friction will inevitably occur when the fabric is transported on the conveyor belt, and the static electricity effect may attract the fluff or fiber residue on the fabric to the conveyor belt. Over time, these tiny fibers gradually aggregate to form larger flocculent substances attached to the surface of the conveyor belt, which in turn causes the surface of the conveyor belt to become uneven or even partially deformed. This change will cause the relative position relationship between the fabric and the printing component to be unstable during the printing process, causing fluctuations in printing pressure, which will ultimately seriously affect the quality of the finished product, such as reduced pattern clarity and uneven color depth. Summary of the invention

[0005] In order to clean the conveyor belt and thus improve the quality of the finished product, the present application provides a rotary screen printing machine.

[0006] The present application provides a rotary screen printing machine, which adopts the following technical solution: A rotary screen printing machine comprises a support, a conveyor belt arranged on the support and a cleaning device for cleaning the conveyor belt, wherein the support is located above the conveyor belt and is provided with a plurality of rotary screens, the plurality of rotary screens are arranged along the length direction of the support, the cleaning device comprises a first nozzle and a placement rack, the placement rack is arranged on one side of the support, the placement rack is used to place the first nozzle, one end of the first nozzle is connected to a water source, the other end of the first nozzle is connected to a transfer pipe, the other end of the transfer pipe is connected to an atomizing nozzle, and a pressure member is arranged on the transfer pipe.

[0007] By adopting the above technical solution, the cleaning device can evenly spray the cleaning liquid through the atomizing nozzle and the pressure member, so as to clean the hair debris on the conveyor belt of the rotary screen printing machine, thereby improving the printing quality of the fabric, and then improving the yield rate and production efficiency.

[0008] Preferably, the pressurizing component includes a one-way valve, an air filling pipe and a pressurizing cylinder, one end of the pressurizing cylinder is connected to the transfer pipe, a sliding plate is slidably arranged in the pressurizing cylinder, the sliding direction of the sliding plate is the length direction of the pressurizing cylinder, one end of the air filling pipe is connected to the other end of the pressurizing cylinder through a one-way valve, and the other end of the air filling pipe is connected to a gas source.

[0009] By adopting the above technical solution and setting a pressurizing cylinder, the water flowing through the transfer pipe compresses the air in the cylinder, and the reaction force of the air in the pressurizing cylinder will provide greater pressure to the water flow in the transfer pipe below, thereby increasing the function of the water flow; in addition, the sliding plate in the pressurizing cylinder can also be pushed by the air pressure provided by the air source, which can stabilize and adjust the air pressure of the nozzle, ensure that the cleaning liquid is sprayed with appropriate pressure and flow, and improve the cleaning effect.

[0010] Preferably, the one-way valve includes a valve body box, an abutment block and an abutment spring, and an inlet and an outlet are respectively provided at both ends of the valve body box, the inlet of the valve body box is connected to the gas filling pipe, and the outlet of the valve body box is connected to the pressure cylinder, one end of the abutment spring is connected to one end of the abutment block, and the other end of the abutment spring is connected to the inner wall of one side of the valve body box where the outlet is opened, and the other end of the abutment block abuts at the inlet to achieve the closure of the inlet.

[0011] By adopting the above technical solution, the one-way valve ensures that the gas flows in only one direction, preventing the gas from flowing back and enhancing the stability and reliability of the system.

[0012] Preferably, it also includes a controller, a pressure sensor and a solenoid valve. The pressurizing cylinder is connected to an exhaust pipe, and the solenoid valve is arranged on the exhaust pipe. The pressure sensor is used to detect the air pressure in the pressurizing cylinder and output a pressure signal. The controller is used to receive the pressure signal and control the solenoid valve to open when the pressure value is greater than the set value.

[0013] By adopting the above technical solution, the solenoid valve is arranged on the exhaust pipe to discharge excessive pressure. When the pressure is detected to be too high, the solenoid valve will automatically open to discharge the excess pressure to prevent the system from being damaged or malfunctioning due to excessive pressure.

[0014] Preferably, the cleaning device also includes a cleaning hammer, a first driving member, a second driving member, a brush roller, a hair removal cover and a first collecting box, the cleaning hammer and the brush roller are arranged along the length direction of the bracket, the first driving member is used to drive the cleaning hammer to strike the conveyor belt, the brush roller is rotatably connected to the bracket and the bristles of the brush roller abut against the conveyor belt, the second driving member is used to drive the brush roller to rotate, the hair removal cover is located below the brush roller, the hair removal cover is connected to a hair removal component for sucking cloth hair on the brush roller, and the first collecting box is located below the cleaning hammer and the hair removal cover.

[0015] By adopting the above technical solution, when the rotary screen printing machine is not in use, the first driving member drives the cleaning hammer to strike the conveyor belt, which can effectively loosen and remove foreign matter adhering to the conveyor belt, and the bristles in contact with the conveyor belt can further clean the residue on the conveyor belt to ensure the cleaning effect. The rotation of the brush roller (driven by the second driving member) can brush the hair and other impurities off the conveyor belt, thereby improving the cleaning efficiency. The depilatory cover is located below the brush roller, which can effectively capture and collect the hair and other cleaning waste that falls off the brush roller. The depilatory component on the depilatory cover further absorbs the cloth hair to prevent the cleaning waste from scattering. The entire cleaning process is automatically controlled by different driving members, which reduces manual intervention and improves the convenience and consistency of operation.

[0016] Preferably, there are multiple cleaning hammers, and the first driving member includes a lifting spring, a lifting box, a lifting plate, a permanent magnet and an electromagnet, the two ends of the lifting box are respectively connected to the two side walls in the width direction of the bracket, the lifting plate is arranged along the width direction of the bracket, the top of the lifting box is open and the lifting plate is slidably connected to the inner wall of the lifting box, the sliding direction of the lifting plate is vertical, the bottom of the knocking hammer is connected to the top of the lifting plate, the permanent magnet is connected to the bottom of the lifting plate, the electromagnet is connected to the bottom wall of the lifting box, the lifting spring is located between the lifting plate and the bottom wall of the lifting box, one end of the lifting spring is connected to the lifting plate, and the other end of the lifting spring is connected to the bottom of the lifting box, and the cleaning hammer knocks on the lower side of the conveyor belt when the electromagnet is intermittently powered on and off.

[0017] By adopting the above technical solution, the intermittent on and off power control of the electromagnet can realize the rhythmic knocking of the cleaning hammer, which is very effective for cleaning the accumulated materials or debris on the lower side of the conveyor belt. Through the periodic knocking action, material backlog can be avoided, the conveyor belt can be kept unobstructed, and transportation resistance and equipment wear can be reduced.

[0018] Preferably, the hair removal hood is connected to a lifting assembly for driving the hair removal hood to move up and down, and the lifting assembly includes two cylinders and two connecting blocks, the two connecting blocks are respectively connected to the two ends of the hair removal hood in the length direction, the two cylinders are respectively connected to the two side walls of the bracket, the piston rod of the cylinder is connected to the bottom of the connecting block and the extension direction of the piston rod of the cylinder is vertical.

[0019] By adopting the above technical solution, the lifting assembly allows the upper and lower positions of the hair removal hood to be accurately adjusted, ensuring that the distance from the brush roller can be adjusted according to actual needs to adapt to different cleaning requirements.

[0020] Preferably, the hair removal component includes a hair removal tube, a second collecting box and a negative pressure source, one end of the hair removal tube is connected to the hair removal cover, and the other end of the hair removal tube is connected to the second collecting box, a filter component for filtering hair debris is provided in the second collecting box, and the negative pressure source is used to provide negative pressure to the second collecting box.

[0021] By adopting the above technical solution, the hair removal tube connects the hair removal cover and the second collection box, which can quickly guide the hair scraps removed from the surface of the equipment into the collection box, effectively preventing the hair scraps from flying into the working environment.

[0022] Preferably, the filter assembly comprises a filter screen, an edge of the filter screen is detachably connected to the inner wall of the second collection box, a box opening is arranged on the side of the second collection box, and a sealing cover is arranged on the box opening of the second collection box.

[0023] By adopting the above technical solution, the edge of the detachable filter is connected to the inner wall, making cleaning and replacing the filter simple and quick, reducing maintenance time and difficulty.

[0024] Preferably, the bracket is also connected to a second nozzle, the cleaning hammer, brush roller and second nozzle are arranged along the length direction of the bracket, the second nozzle is arranged along the width direction of the bracket, the second nozzle is connected to a water source, and the second nozzle is provided with a plurality of cleaning nozzles, and the plurality of cleaning nozzles are used to spray water toward the conveyor belt, and the first collecting box is located below the second nozzle.

[0025] By adopting the above technical solution, the combination of the cleaning hammer, the brush roller and the second nozzle can achieve multi-level cleaning. The cleaning hammer physically removes hair scraps by knocking, the brush roller removes residues by brushing, and the second nozzle further rinses and cleans by spraying water, thereby providing a comprehensive cleaning effect.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The cleaning device can evenly spray the cleaning liquid through the atomizing nozzle and the pressure piece, so as to clean the hair scraps on the conveyor belt of the rotary screen printing machine, thereby improving the printing quality of the fabric, and then improving the yield rate and production efficiency; 2. By setting up a pressurized cylinder, the water flowing through the transfer pipe compresses the air in the cylinder. The reaction force of the air in the pressurized cylinder will provide greater pressure to the water flow in the transfer pipe below, thereby increasing the function of the water flow; in addition, the sliding plate in the pressurized cylinder can also be pushed by the air pressure provided by the air source, which can stabilize and adjust the air pressure of the nozzle, ensuring that the cleaning liquid is sprayed at an appropriate pressure and flow rate, thereby improving the cleaning effect; 3. The one-way valve ensures that the gas flows in only one direction, preventing gas backflow and enhancing the stability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the rotary screen printing machine of the embodiment of the present application.

[0028] Figure 2 It is a partial structural cross-sectional schematic diagram of a rotary screen printing machine according to an embodiment of the present application, mainly showing a pressurizing cylinder.

[0029] Figure 3 It is a partial structural cross-sectional schematic diagram of a rotary screen printing machine according to an embodiment of the present application, mainly showing a one-way valve.

[0030] Figure 4 It is a structural block diagram of the rotary screen printing machine of the embodiment of the present application.

[0031] Figure 5 It is a partial structural cross-sectional schematic diagram of a rotary screen printing machine according to an embodiment of the present application, mainly showing a cleaning device.

[0032] Explanation of the reference numerals: 1. bracket; 2. conveyor belt; 3. round net; 41. first nozzle; 411. atomizing nozzle; 42. placement rack; 43. transfer pipe; 44. gas filling pipe; 45. pressurizing cylinder; 451. sliding plate; 452. exhaust pipe; 46. valve body box; 47. abutment block; 48. abutment spring; 51. controller; 52. pressure sensor; 53. solenoid valve; 61. cleaning hammer; 62. brush roller; 63. hair removal cover; 64. first collecting box; 71. lifting spring; 72. lifting box; 73. lifting plate; 74. permanent magnet; 75. electromagnet; 81. cylinder; 82. connecting block; 91. hair removal tube; 92. second collecting box; 921. filter screen; 93. negative pressure source; 10. second nozzle; 11. cleaning nozzle. DETAILED DESCRIPTION

[0033] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0034] The present application embodiment discloses a rotary screen printing machine. Figure 1 , Figure 2A rotary screen printing machine includes a bracket 1, on which a conveyor belt 2 for conveying cloth is arranged. The conveyor belt 2 is a mesh belt. The bracket 1 is located above the conveyor belt 2 and a plurality of rotary screens 3 are arranged. The cloth is transported to the bottom of the plurality of rotary screens 3 through the conveyor belt 2 for printing the cloth.

[0035] It also includes a cleaning device for cleaning the conveyor belt 2, the cleaning device includes a first nozzle 41 and a placement rack 42, the placement rack 42 is a gate-shaped pile, the placement rack 42 is arranged on one side of the bracket 1, and a placement hole for placing the first nozzle 41 is opened on the placement rack 42. One end of the first nozzle 41 is connected to a water source, which can be a bucket with a water pump. The bucket is filled with cleaning liquid, and the water pump provides water power. The other end of the first nozzle 41 is connected to a transfer pipe 43, and the other end of the transfer pipe 43 is connected to an atomizing nozzle 411, and a pressure-increasing member is arranged on the transfer pipe 43.

[0036] Reference Figure 2 , Figure 3 The pressurizing part includes a one-way valve, an air filling pipe 44 and a pressurizing cylinder 45. One end of the pressurizing cylinder 45 is connected to the top of the transfer pipe 43. A sliding plate 451 is slidably arranged in the pressurizing cylinder 45. The sliding direction of the sliding plate 451 is the length direction of the pressurizing cylinder 45. The diameter of the sliding plate 451 is larger than the openings at both ends of the pressurizing cylinder 45. In addition, a limiting block is arranged in the pressurizing cylinder 45, and the sliding plate 451 abuts against the limiting block when sliding. One end of the air filling pipe 44 is connected to the other end of the pressurizing cylinder 45 through a one-way valve, and the other end of the air filling pipe 44 is connected to an air source, which can be an air pump. The air inlet of the air pump is connected to the outside world, and the air outlet of the air pump is connected to the air filling pipe 44. The design of the one-way valve and the pressurizing cylinder 45 simplifies the maintenance and adjustment of the system. The maintenance personnel can easily adjust the air pressure in the pressurizing cylinder 45 to ensure long-term and efficient operation of the system.

[0037] The one-way valve includes a valve body box 46, an abutment block 47 and an abutment spring 48. The valve body box 46 is provided with an inlet and an outlet at the top and the bottom respectively. The inlet of the valve body box 46 is connected with the gas filling pipe 44, and the outlet of the valve body box 46 is connected with the pressurizing cylinder 45. The valve body box 46 is cylindrical, and the top of the abutment block 47 is conical to facilitate closing the inlet. The horizontal cross-section of the abutment block 47 is smaller than the inner diameter of the valve body box 46 to allow air to pass through. One end of the abutment spring 48 is bonded to the bottom of the abutment block 47, and the other end of the abutment spring 48 is bonded to the inner wall of one side of the valve body box 46 where the outlet is opened.

[0038] Reference Figure 2 , Figure 4, also includes a controller 51, a pressure sensor 52 and a solenoid valve 53. The pressurizing cylinder 45 is connected to an exhaust pipe 452. The opening of the exhaust pipe 452 in the pressurizing cylinder 45 is located on the side of the abutment block 47 away from the sliding plate 451. The solenoid valve 53 is arranged on the exhaust pipe 452. The pressure sensor 52 adopts an air pressure sensor and is installed in the pressurizing cylinder 45. The pressure sensor 52 is used to detect the air pressure in the pressurizing cylinder 45 and output a pressure signal. The controller 51 is used to receive the pressure signal and control the solenoid valve 53 to open when the pressure value is greater than the set value. The set value can be input by the designer. The real-time pressure monitoring and automatic adjustment mechanism improve the safety of the system. The controller 51 can respond in time when the pressure is abnormal, reducing potential safety risks and equipment damage.

[0039] Reference Figure 1 , Figure 5 The cleaning device also includes a plurality of cleaning hammers 61, a brush roller 62, a second nozzle 10, a first driving member, a second driving member, a hair removal cover 63 and a first collecting box 64. The cleaning hammer 61, the brush roller 62 and the second nozzle 10 are arranged along the length direction of the bracket 1. When the conveyor belt 2 is cleaned, the conveyor belt 2 passes through the cleaning hammer 61, the brush roller 62 and the second nozzle 10 in sequence. The first driving member is used to drive the cleaning hammer 61 to knock the conveyor belt 2. The first driving member includes a lifting spring 71, a lifting box 72, a lifting plate 73, a permanent magnet 74 and an electromagnet 75. The two ends of the lifting box 72 are respectively connected to the bottom of the two side walls in the width direction of the bracket 1 by bolts. The lifting plate 73 is arranged along the width direction of the bracket 1. The top of the lifting box 72 is open and the lifting plate 73 is slidably connected to the inner wall of the lifting box 72. The sliding direction of the plate 73 is vertical. The bottom of the knocking hammer is connected to the top of the lifting plate 73 by bolts. Multiple cleaning hammers 61 are arranged along the width direction of the bracket. The permanent magnet 74 is connected to the bottom of the lifting plate 73. There are multiple lifting springs 71 and the multiple lifting springs 71 are arranged along the width direction of the bracket. There are multiple permanent magnets 74. The permanent magnet 74 is located between the two lifting springs 71. The lifting spring 71 is located between the lifting plate 73 and the bottom wall of the lifting box 72. One end of the lifting spring 71 is bonded to the lifting plate 73, and the other end of the lifting spring 71 is bonded to the electromagnet on the bottom of the lifting box 72. The lifting spring is made of non-ferromagnetic material. When the electromagnet 75 is intermittently turned on and off, the cleaning hammer 61 knocks on the lower side of the conveyor belt 2. The conveyor belt 2 is elastic, so that the cloth hair accumulated on the conveyor belt 2 is broken up.

[0040] The two ends of the brush roller 62 are rotatably connected to the two side walls of the bracket 1 respectively, and the bristles of the brush roller 62 abut against the conveyor belt 2. The second driving member includes a second drive motor 621, and the second drive motor 621 is connected to the side wall of the bracket 1 by bolts. The output shaft of the second drive motor 621 is circumferentially fixed to the brush roller 62, and the brush roller 62 is located in the hair removal cover 63. The hair removal cover 63 is connected with a lifting component for driving the hair removal cover 63 to move up and down. The lifting component includes two cylinders 81 and two connecting blocks 82. The two connecting blocks 82 are respectively connected to the two ends of the hair removal cover 63 in the length direction by bolts, and the cylinder 81 is connected to the side wall of the bracket 1 by bolts. The piston rod of the cylinder 81 is connected to the bottom of the connecting block 82 by bolts. A slide groove is provided on the side wall of the bracket 1, and the connecting block 82 is slidably connected to the slide groove and the sliding method is in the vertical direction. The first drive motor 72 and the second drive motor 621 both adopt servo motors.

[0041] The hair removal hood 63 is connected to a hair removal component for sucking cloth hair on the brush roller 62, and the hair removal component includes a hair removal tube 91, a second collecting box 92 and a negative pressure source 93. A hose is connected to the bottom of the hair removal hood 63, and the other end of the hose is connected to the second collecting box 92. A filter component for filtering hair debris is arranged in the second collecting box 92. The negative pressure source 93 adopts a vacuum pump, and the air inlet of the vacuum pump is connected to the second collecting box 92. The filter component includes a filter screen 921, and the filter screen 921 is vertically arranged and located between the negative pressure source 93 and the inlet of the hose. The two ends of the filter screen 921 are connected to the top wall and the bottom wall of the second collecting box 92 by bolts. A box opening is opened on the side of the filter box, and a sealing cover is provided at the box opening. The sealing cover is connected to the edge of the box opening by bolts, and the sealing cover can be connected to a sealing strip, thereby improving the sealing of the second collecting box 92.

[0042] After the conveyor belt 2 is cleaned by the brush roller 62, it is cleaned again by the second nozzle 10. The second nozzle 10 is arranged along the width direction of the bracket 1. Both ends of the second nozzle 10 are connected to the side walls of the bracket 1 and one end of the second nozzle 10 is connected to a water source through a water inlet pipe. The water source can be a high-pressure water source. A plurality of cleaning nozzles 11 are arranged on the second nozzle 10. The plurality of cleaning nozzles 11 are arranged inclined upward. The plurality of cleaning nozzles 11 are used to spray water toward the conveyor belt 2. The first collecting box 64 is located below the second nozzle 10 and is used to collect water sprayed by the cleaning nozzles 11. A drain pipe is connected to the bottom of the first collecting box 64. The drain pipe is used to discharge the waste water in the first collecting box 64. A baffle for guiding the water sprayed by the cleaning nozzle 11 to the first collecting box 64 is connected between the two side walls of the bracket 1 by bolts. The first baffle does not affect the transportation of the conveyor belt 2, and the inclination direction of the baffle is parallel to the inclination direction of the cleaning nozzle 11.

[0043] The implementation principle of a rotary screen printing machine in an embodiment of the present application is as follows: the cleaning device can evenly spray the cleaning liquid through the atomizing cleaning nozzle 11 and the pressure member, so as to clean the hair debris on the conveyor belt 2 of the rotary screen 3 printing machine, thereby improving the printing quality of the fabric, and then improving the yield rate and improving the production efficiency; by setting a pressure cylinder 45, the water flowing through the transfer pipe 43 compresses the air in the cylinder, and the reaction force of the air in the pressure cylinder 45 will provide greater pressure to the water flow in the lower transfer pipe 43, thereby increasing the function of the water flow; in addition, the sliding plate 451 in the pressure cylinder 45 can also be pushed by the air pressure provided by the air source, which can stabilize and adjust the air pressure of the nozzle, ensure that the cleaning liquid is sprayed with appropriate pressure and flow, and improve the cleaning effect.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rotary screen printing machine, characterized in that: The invention comprises a support (1), a conveyor belt (2) arranged on the support (1), and a cleaning device for cleaning the conveyor belt (2); the support (1) is located above the conveyor belt (2) and is provided with a plurality of round nets (3); the plurality of round nets (3) are arranged along the length direction of the support (1); the cleaning device comprises a first nozzle (41) and a placement rack (42); the placement rack (42) is arranged on one side of the support (1); the placement rack (42) is used to place the first nozzle (41); one end of the first nozzle (41) is connected to a water source; the other end of the first nozzle (41) is connected to a transfer pipe (43); the other end of the transfer pipe (43) is connected to an atomizing nozzle (411); and a pressure member is arranged on the transfer pipe (43).

2. A rotary screen printing machine according to claim 1, characterized in that: The pressurizing component comprises a one-way valve, a gas filling pipe (44) and a pressurizing cylinder (45); one end of the pressurizing cylinder (45) is connected to the transfer pipe (43); a sliding plate (451) is slidably arranged in the pressurizing cylinder (45); the sliding direction of the sliding plate (451) is the length direction of the pressurizing cylinder (45); one end of the gas filling pipe (44) is connected to the other end of the pressurizing cylinder (45) through the one-way valve; and the other end of the gas filling pipe (44) is connected to a gas source.

3. A rotary screen printing machine according to claim 2, characterized in that: The one-way valve comprises a valve body box (46), an abutment block (47) and an abutment spring (48); an inlet and an outlet are respectively provided at two ends of the valve body box (46); the inlet of the valve body box (46) is communicated with the gas filling pipe (44); the outlet of the valve body box (46) is communicated with the pressurizing cylinder (45); one end of the abutment spring (48) is connected to one end of the abutment block (47); the other end of the abutment spring (48) is connected to an inner wall of a side of the valve body box (46) where the outlet is provided; the other end of the abutment block abuts against the inlet to close the inlet.

4. A rotary screen printing machine according to claim 2, characterized in that: It also includes a controller (51), a pressure sensor (52) and a solenoid valve (53); the pressurizing cylinder (45) is connected to an exhaust pipe (452); the solenoid valve (53) is arranged on the exhaust pipe (452); the pressure sensor (52) is used to detect the air pressure in the pressurizing cylinder (45) and output a pressure signal; the controller (51) is used to receive the pressure signal and control the solenoid valve (53) to open when the pressure value is greater than a set value.

5. A rotary screen printing machine according to claim 1, characterized in that: The cleaning device further comprises a cleaning hammer (61), a first driving member, a second driving member, a brush roller (62), a hair removal cover (63) and a first collecting box (64); the cleaning hammer (61) and the brush roller (62) are arranged along the length direction of the bracket (1); the first driving member is used to drive the cleaning hammer (61) to strike the conveyor belt (2); the brush roller (62) is rotatably connected to the bracket (1) and the hair of the brush roller (62) abuts against the conveyor belt (2); the second driving member is used to drive the brush roller (62) to rotate; the hair removal cover (63) is located below the brush roller (62); the hair removal cover (63) is connected to a hair removal component for absorbing cloth hair on the brush roller (62); and the first collecting box (64) is located below the cleaning hammer (61) and the hair removal cover (63).

6. A rotary screen printing machine according to claim 5, characterized in that: The cleaning hammer (61) has a plurality of parts, the first driving member comprises a lifting spring (71), a lifting box (72), a lifting plate (73), a permanent magnet (74) and an electromagnet (75), the two ends of the lifting box (72) are respectively connected to the two side walls of the bracket (1) in the width direction, the lifting plate (73) is arranged along the width direction of the bracket (1), the top of the lifting box (72) is open and the lifting plate (73) is slidably connected to the inner wall of the lifting box (72), the sliding direction of the lifting plate (73) is vertical, and the hammer (71) is provided with a plurality of parts. The bottom of the hammer is connected to the top of the lifting plate (73), the permanent magnet (74) is connected to the bottom of the lifting plate (73), the electromagnet (75) is connected to the bottom wall of the lifting box (72), the lifting spring (71) is located between the lifting plate (73) and the bottom wall of the lifting box (72), one end of the lifting spring (71) is connected to the lifting plate (73), and the other end of the lifting spring (71) is connected to the bottom of the lifting box (72), and when the electromagnet (75) is intermittently powered on and off, the cleaning hammer (61) strikes the lower side of the conveyor belt (2).

7. A rotary screen printing machine according to claim 5, characterized in that: The hair removal cover (63) is connected to a lifting assembly for driving the hair removal cover (63) to move up and down, and the lifting assembly comprises two cylinders (81) and two connecting blocks (82). The two connecting blocks (82) are respectively connected to the two ends of the hair removal cover (63) in the length direction, and the two cylinders (81) are respectively connected to the two side walls of the bracket (1). The piston rod of the cylinder (81) is connected to the bottom of the connecting block (82) and the extension direction of the piston rod of the cylinder (81) is the vertical direction.

8. A rotary screen printing machine according to claim 5, characterized in that: The hair removal component comprises a hair removal tube (91), a second collection box (92) and a negative pressure source (93); one end of the hair removal tube (91) is connected to the hair removal cover (63); the other end of the hair removal tube (91) is connected to the second collection box (92); a filter component for filtering hair debris is arranged in the second collection box (92); and the negative pressure source (93) is used to provide negative pressure to the second collection box (92).

9. A rotary screen printing machine according to claim 8, characterized in that: The filter assembly comprises a filter screen (921), the edge of the filter screen (921) being detachably connected to the inner wall of the second collection box (92), a box opening being provided on the side of the second collection box (92), and a sealing cover being provided at the box opening of the second collection box (92).

10. A rotary screen printing machine according to claim 5, characterized in that: The support (1) is also connected to a second nozzle (10); the cleaning hammer (61), the brush roller (62) and the second nozzle (10) are arranged along the length direction of the support (1); the second nozzle (10) is arranged along the width direction of the support (1); the second nozzle (10) is connected to a water source; a plurality of cleaning nozzles (11) are arranged on the second nozzle (10); the plurality of cleaning nozzles (11) are used to spray water toward the conveyor belt (2); and the first collecting box (64) is located below the second nozzle (10).

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