Pneumatic screen printing scraping arm mechanism

Abstract

The utility model discloses a pneumatic screen printing scraping arm mechanism which comprises a printing head module and a pneumatic module, the printing head module comprises a printing head supporting plate and a plurality of sets of double-stroke air cylinders arranged on the two sides of the top face of the printing head supporting plate, and the printing head module is arranged on the lower surface of the front end of a bridge plate on the pneumatic module through the printing head supporting plate. Two of the multiple sets of double-stroke air cylinders are jointly connected with an ink scraping blade assembly through air cylinder shafts, and the other two sets of double-stroke air cylinders are jointly connected with an ink returning blade assembly through air cylinder shafts. The length of the bridge plate is larger than that of the module sliding seat, the upper surface of the rear end of the bridge plate is fixedly connected with the module sliding seat, and when the printing head module is located at the foremost side, the whole printing head module is located outside the module frame range of the pneumatic module, so that the module main body occupies the operation space as little as possible, and an operator can conveniently take and place a printing stock; the occupied space is reduced, and adjustment and use are not affected. And meanwhile, the double-stroke air cylinders on the printing head supporting plate are arranged on the two sides of the top face, and collision between the air cylinders and the pneumatic module when the printing head module moves front and back is avoided.

Description

Technical Field

[0001] This utility model relates to the field of screen printing machine technology, specifically to a pneumatic screen printing scraper mechanism. Background Technology

[0002] Currently, medium and large-sized flatbed screen printing machines require pneumatic screen printing squeegee mechanisms during operation. These mechanisms resemble a horizontal scraping motion, hence the name "horizontal pneumatic screen printing squeegee mechanism." They consist of a pneumatic module, a print head assembly, and pneumatic accessories. However, existing pneumatic screen printing squeegee mechanisms have the following shortcomings;

[0003] 1. The existing pneumatic type of horizontal scraper arm technology uses a rod cylinder as the drive, which occupies a lot of space and is only suitable for short stroke scraper arms. In addition, the scraper arm is telescopic, which is not conducive to long stroke extension and can easily lead to problems such as bearing wear and large play in the module slide.

[0004] 2. Existing inclined arm screen printing machines suffer from problems such as large scraper arm size, safety issues, high cost, and inconvenient operation.

[0005] 3. The existing electric module type of scraper arm is inconvenient to adjust the stroke. Compared with it, the pneumatic screen printing scraper arm has the advantages of simple control, safety and low production cost.

[0006] 4. Existing electric modular scraper arms occupy space above the worktable, obstructing the operator's view and making it inconvenient to handle the substrate placed on the worktable. This manifests itself in the fact that when the print head assembly is at the front, its position is still within the module range of the scraper arm, making it inconvenient for the operator to load and unload materials.

[0007] Based on the above-mentioned shortcomings, those skilled in the art have proposed a pneumatic screen printing scraper mechanism suitable for use on medium and large-sized flatbed rocker arm screen printing machines. Utility Model Content

[0008] To address the shortcomings of existing technologies, this utility model provides a pneumatic screen printing squeegee mechanism suitable for use on medium to large-sized flatbed rocker arm screen printing machines. It solves the problem that existing screen printing machines' squeegees can only print small areas, and addresses issues such as the long space occupied by the rod cylinder in existing pneumatic squeegees, which is not conducive to long-stroke extension and easily leads to bearing wear and large play in the module slide. It also solves the problems of large size, safety concerns, high cost, and inconvenient operation of existing inclined arm screen printing machines' squeegees.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A pneumatic screen printing squeegee mechanism includes a print head module and a pneumatic module. The print head module includes a print head support plate and multiple sets of double-stroke cylinders disposed on both sides of the top surface of the print head support plate. The print head module is mounted on the lower front surface of the bridge plate on the pneumatic module via the print head support plate. Two sets of double-stroke cylinders are connected to a squeegee assembly via cylinder shafts, and the other two sets of double-stroke cylinders are connected to a return ink blade assembly via cylinder shafts.

[0011] Furthermore, the doctor blade assembly includes a double-ended connecting rod, which includes an integrally formed connector and a rod body. The connector is located at one end of the rod body. One end of the connector has a through-type circular groove on its main surface, and the other end has a through-type elliptical groove on its main surface. Both ends of the connector have through-type slots on their sides that communicate with the through-type circular groove and the through-type elliptical groove. The rod body has two sets of clamping parts, and the lower part of the two sets of clamping parts is connected to a doctor blade clamp. The lower part of the doctor blade clamp is provided with a doctor blade.

[0012] Furthermore, the ink return blade assembly includes a double-ended connecting rod 2, which includes an integrally formed connecting head 2 and a rod body 2. The connecting head 2 is located at the first and second ends of the rod body 2. One end of the connecting head 2 has a through-type circular groove 2 on its main surface, and the other end of the connecting head 2 has a through-type elliptical groove 2 on its main surface. The sides of both ends of the connecting head 2 have through-type bayonets 2 that communicate with the through-type circular groove 2 and the through-type elliptical groove 2. The rod body 2 is provided with two sets of clamping parts 2, and the lower part of the two sets of clamping parts 2 is connected to an ink return blade plate. An ink return blade is provided at the lower part of the ink return blade plate.

[0013] Furthermore, the cylinder shaft on the double-stroke cylinder has a connector at the end through the guide sleeve. The lower part of the connector has a flat cut surface that matches the bayonet, and the flat cut surface has a through hole corresponding to the connection hole.

[0014] Furthermore, a tracheal support is provided on the side of the printhead support plate.

[0015] Furthermore, the pneumatic module includes a module frame, a module slide assembly is provided inside the module frame, a rodless cylinder is provided on the upper part of the module frame, and stroke adjustment components are provided at both ends of the module slide assembly. The module slide assembly is connected to the cylinder slider of the rodless cylinder through a module slide block.

[0016] Furthermore, the module frame is composed of two short-side fixing plates and two long-side fixing plates. One short-side fixing plate has a clearance hole and a guide shaft through hole on its main surface, and a bolt hole communicating with the guide shaft through hole on its bottom surface. The other short-side fixing plate has a clearance hole and a stepped hole on its main surface, and blind holes are formed on the top surfaces of the two short-side fixing plates. Several through-type threaded holes are formed on the sides of the two long-side fixing plates.

[0017] Furthermore, the module slide assembly includes a module slide base and three sets of guide shafts. The three sets of guide shafts are connected to the module slide base in a triangular pattern. Their first and last ends are connected to the guide shaft through holes and stepped holes of the short side fixing plate. The module slide base is equipped with bushings and bearings. The outer side of the short side of the module slide base is equipped with an anti-loosening stop block. The top surface of the module slide base is equipped with a slot that cooperates with the cylinder slider. A sensing plate is provided on one side of the slot. The bottom surface of the module slide base is equipped with a bridge plate. The length of the bridge plate is greater than that of the module slide base. The upper surface of the rear end of the bridge plate is fixedly connected to the module slide base. The lower surface of the front end of the bridge plate is fixedly connected to the middle of the top surface of the print head support plate. An air passage manifold is provided at the bottom of the bridge plate.

[0018] Furthermore, the main surface of the anti-loosening block is provided with a connection port adapted to the guide shaft, and the main surface of the anti-loosening block is also provided with a connection hole, through which a connecting rod is inserted to connect the anti-loosening block to the module slide.

[0019] Furthermore, the stroke adjustment component includes a tension fixing block. The main surface of the tension fixing block has an assembly port corresponding to the three sets of guide shafts. The main surface of the tension fixing block has a through-connected buffer component. One short side end face of the tension fixing block has a clamping opening that communicates with the assembly port. The top and bottom surfaces of the tension fixing block have bolt holes that communicate with the clamping opening. The tension of the clamping opening is adjusted by inserting bolts through the bolt holes. A sensor is provided on the top surface of the tension fixing block.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. A pneumatic screen printing squeegee mechanism is provided, comprising an print head module and a pneumatic module. The print head module includes a print head support plate and multiple sets of double-stroke cylinders disposed on both sides of the top surface of the print head support plate. The print head module is mounted on the lower front surface of a bridge plate on the pneumatic module via the print head support plate. Two sets of double-stroke cylinders are connected to a squeegee assembly via cylinder shafts, and the other two sets of double-stroke cylinders are connected to a return ink blade assembly via cylinder shafts. The bridge plate is longer than the module slide, and by fixing the upper rear surface of the bridge plate to the module slide, when the print head module is in its foremost position, the entire print head module is outside the module frame of the pneumatic module. This layout avoids the space occupied by the pneumatic module itself, minimizing the space occupied by the module body and facilitating the operator to handle the printing substrate, thus reducing its space occupation without affecting its adjustment and use. Meanwhile, the double-stroke cylinders on the print head support plate are placed on both sides of the top surface, so that the middle position of the top of the print head support plate forms a clearance space to avoid collision between the double-stroke cylinders and the pneumatic module when the print head module moves back and forth.

[0022] 2. Two sets of double-stroke cylinders are connected to the doctor blade assembly via cylinder shafts, and two other sets of double-stroke cylinders are connected to the return ink blade assembly via cylinder shafts. The doctor blade assembly and the return ink blade assembly are driven by the double-stroke cylinders to switch between scraping and returning ink. This solves the printing area limitation of traditional small flatbed swing arm screen printing machines, and also solves the problems of large flatbed tilting arm screen printing machines being too large, too heavy, having low safety, and high cost.

[0023] 3. A rodless cylinder is installed on the upper part of the module frame, and a module slide assembly and stroke adjustment assembly are installed inside the module frame. This achieves a small footprint, allows the module stroke to extend over a large range, and the module slide is not prone to wear or excessive play due to the support of three sets of guide shafts. Attached Figure Description

[0024] Figure 1 The diagram shown is an assembly structure diagram of the pneumatic screen printing scraper arm mechanism.

[0025] Figure 2 The diagram shown is a structural diagram of the overall assembly of the printhead module.

[0026] Figure 3 The diagram shown is an exploded view of the printhead module.

[0027] Figure 4 The diagram shown is an exploded view of the doctor blade assembly.

[0028] Figure 5 The diagram shown is an exploded view of the ink return blade assembly.

[0029] Figure 6 The diagram shown is a structural diagram of the pneumatic module assembly.

[0030] Figure 7 The diagram shown is an exploded view of the pneumatic module.

[0031] Figure 8 The diagram shown is a structural diagram of the module frame;

[0032] Figure 9 The diagram shown is a structural diagram of the module slide assembly;

[0033] Figure 10 The diagram shown is an exploded view of the module slide assembly.

[0034] Figure 11 The diagram shown is an exploded view of the stroke adjustment component.

[0035] In the diagram: 1. Printhead module; 2. Pneumatic module; 3. Doctor blade assembly; 4. Return ink blade assembly; 5. Air manifold; 11. Printhead support plate; 12. Double-stroke cylinder; 13. Air pipe bracket; 121. Cylinder shaft; 122. Guide sleeve; 123. Connector; 1231. Flat cut surface; 1232. Through hole; 31. Double-end connecting rod one; 32. Clamping piece one; 33. Doctor blade clamp; 34. Doctor blade; 311. Connector one; 312. Rod body one; 3111. Circular groove one; 3112. Through-type bayonet one; 3113. Elliptical groove one; 41. Double-end connecting rod two; 42. Clamping piece two; 43. Return ink blade plate; 44. Return ink blade; 411. Connector two; 4 12. Rod body two; 4111. Circular groove two; 4112. Bayonet two; 4113. Elliptical groove two; 21. Module frame; 22. Module slide assembly; 23. Rodless cylinder; 24. Stroke adjustment assembly; 211. Short side fixing plate; 212. Long side fixing plate; 221. Module slide; 222. Guide shaft; 223. Bushing; 224. Bearing; 225. Anti-loosening stop block; 226. Sensor plate; 227. Bridge plate; 231. Cylinder slider; 241. Tightening and loosening block; 242. Buffer component; 244. Bolt; 245. Sensor; 2211. Slot; 2251. Connection port; 2252. Connection hole; 2411. Assembly port; 2412. Clamping port. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] See Figure 1-11This utility model provides a technical solution: a pneumatic screen printing squeegee mechanism, including a print head module 1 and a pneumatic module 2. The print head module 1 includes a print head support plate 11 and multiple sets of double-stroke cylinders 12 disposed on both sides of the top surface of the print head support plate 11. The print head module 1 is disposed on the lower front surface of the bridge plate 227 on the pneumatic module 1 via the print head support plate 11. Two sets of double-stroke cylinders in the multiple sets of double-stroke cylinders 12 are connected to a squeegee assembly 3 via cylinder shafts, and the other two sets of double-stroke cylinders are connected to a return ink blade assembly 4 via cylinder shafts. By disposing of the print head module 1 on the lower front surface of the bridge plate 227 on the pneumatic module 1, when the print head module is in its foremost position, the entire print head module is outside the module frame 21 of the pneumatic module 1. This layout avoids the space occupied by the pneumatic module itself, minimizing the space occupied by the module body and facilitating the operator to handle the printing substrate, thus reducing its space occupation without affecting its adjustment and use. Meanwhile, the double-stroke cylinders 12 on the top surface of the print head support plate 11 are placed on both sides, so that the middle position of the top of the print head support plate 11 forms a clearance space to avoid collision between the double-stroke cylinders 12 and the pneumatic module 2 when the print head module 1 moves back and forth.

[0038] See Figure 2-4 The doctor blade assembly 3 includes a double-ended connecting rod 31, which includes an integrally formed connector 311 and a rod body 312. The connector 311 is located at the first and second ends of the rod body 312. Through the integral design of the connector 311 and the rod body 312, the assembly gap of the traditional split connector is effectively eliminated, forming an overall rigidity. One end connector 311 has a through-type circular groove 3111 on its main surface, and the other end connector 311 has a through-type elliptical groove 3113 on its main surface. Both ends connector 311 have through-type bayonets 3112 on their sides that communicate with the through-type circular groove 3111 and the through-type elliptical groove 3113. The through-type bayonets 3112 allow the double-end connector 31 to be quickly engaged with the cylinder shaft 121. The through-type circular groove 3111 and the through-type elliptical groove 3113 are for the fastener to pass through. In addition, the through-type elliptical groove 3113 has another purpose: to leave a certain clearance when connected with the fastener, so as to facilitate the stroke cylinder to adjust the left and right level of the doctor blade assembly 3 and prevent jamming. Two sets of clamps 32 are provided on the rod body 312. The lower part of the two sets of clamps 32 is connected to the doctor blade clamp 33. The doctor blade 34 is provided at the lower part of the doctor blade clamp 33. The function of the two clamps 32 is to form a double-support cantilever structure, which significantly improves the stability of the doctor blade assembly 3 during operation.

[0039] See Figure 2-3 , Figure 5The ink return knife assembly 4 includes a double-ended connecting rod 41. The double-ended connecting rod 41 includes an integrally formed connector 411 and a rod body 412. The connector 411 is located at the first and second ends of the rod body 412. Through the integral design of the connector 411 and the rod body 412, the assembly gap of the traditional split connector is effectively eliminated, forming an overall rigidity. One end connector 411 has a through-type circular groove 4111 on its main surface, and the other end connector 411 has a through-type elliptical groove 4113 on its main surface. Both ends connector 411 have through-type bayonets 4112 on their sides that communicate with the through-type circular groove 4111 and the through-type elliptical groove 4113. The through-type bayonets 4112 allow the double-end connector 41 to quickly engage with the cylinder shaft 121. The through-type circular groove 4111 and the through-type elliptical groove 4113 allow the fixing parts to pass through them. In addition, the through-type elliptical groove 4113 has another purpose: to leave a certain clearance when connecting with the fixing parts so that the stroke cylinder can be aligned horizontally with the ink return knife assembly 4 to prevent jamming. Two sets of clamping components 42 are installed on the rod body 412. The lower part of the two sets of clamping components 42 is connected to the ink return blade plate 43. The ink return blade 44 is installed at the lower part of the ink return blade plate 43. The function of the two sets of clamping components 42 is to form a double-support cantilever structure, which significantly improves the stability of the ink return blade assembly 4 during operation.

[0040] See Figure 3-4 The cylinder shaft 121 of the double-stroke cylinder 12 has a connector 123 at its end passing through the guide sleeve 122. The lower part of the connector 123 has a flat surface 1231 that matches the bayonet, and the flat surface 1231 has a through hole 1232 corresponding to the connecting hole. The flat surface 1231 allows the cylinder shaft 121 to be quickly connected to the double-end connecting rod 31. The through hole 1232 is used for a fixing component to pass through, so that the cylinder shaft 121 and the double-end connecting rod 31 are connected together.

[0041] See Figure 2-3 The side of the print head support plate 11 is provided with a trachea bracket 13 for assisting in the installation of the trachea.

[0042] See Figure 6-7 The pneumatic module 2 includes a module frame 21, inside which is a module slide assembly 22. A rodless cylinder 23 is mounted on the upper part of the module frame 21. Stroke adjustment components 24 are mounted at both ends of the module slide assembly 22. The module slide assembly 22 is connected to the cylinder slider 231 of the rodless cylinder 23 via a module slide block 221. By mounting the rodless cylinder 23 on the upper part of the module frame 21 and installing the module slide assembly 22 and stroke adjustment components 24 inside the module frame 21, the longitudinal or lateral space occupied can be reduced, facilitating the maintenance of the pneumatic module without affecting stroke adjustment, thus reducing the overall space occupied by the module.

[0043] See Figure 8 The module frame 21 consists of two short-side fixing plates 211 and two long-side fixing plates 212. One short-side fixing plate 211 has a clearance hole 2111 and a guide shaft through hole 2112 on its main surface. The bottom surface of the short-side fixing plate 211 has a bolt hole 2113 communicating with the guide shaft through hole 2112. The other short-side fixing plate 211 has a clearance hole 2111 and a stepped hole 2114 on its main surface. The top surface of the two short-side fixing plates 2111 has a blind hole 2115. The clearance hole 2111 is for the buffer component 242 to pass through. The guide shaft through hole 2112 is for the guide shaft 222 to be connected therein. The stepped hole 2114 is for the guide shaft 222 to be connected therein and for limiting its position. A locking fastener is installed in the blind hole 2115. The rodless cylinder 23 is fixed to the upper part of the two short-side fixing plates 211 by the locking fastener.

[0044] The two long-side fixing plates 212 have several through-holes 2121 on their sides. By setting locking fasteners and inserting them into the through-holes 2121, the support force of the module frame 21 is improved for fixing on one side, and the single-side installation and fixing method facilitates connection with other mechanism components.

[0045] See Figure 9-10 The module slide assembly 22 includes a module slide base 221 and three sets of guide shafts 222. The three sets of guide shafts 222 are connected to the module slide base 221 in a triangular manner. Their first and last ends are connected to the guide shaft through holes 2112 and stepped holes 2114 of the short side fixing plate 211. The module slide base 221 is provided with bushings 223 and bearings 224. The outer side of the short side of the module slide base 221 is provided with anti-loosening blocks 225. The top surface of the module slide base 221 is provided with a slot 2211 that mates with the cylinder slider 231. A sensing plate 226 is provided on one side of the slot 2211. The bottom surface of the module slide base 221... A bridge plate 227 is provided, the length of which is greater than that of the module slide 221. The upper rear surface of the bridge plate 227 is fixedly connected to the module slide 221, and the lower front surface of the bridge plate 227 is fixedly connected to the middle of the top surface of the print head support plate 11. By fixing the upper rear surface of the bridge plate 227 to the module slide 221, when the print head module 1 is in the foremost position, the entire print head module 1 is outside the module frame 21 of the pneumatic module 2. This layout avoids the problem of space occupied by the pneumatic module 1 itself, and also makes the operation of the equipment it is located in safer and facilitates the loading and unloading operations of technicians.

[0046] See Figure 1The bottom of the bridge plate 227 is provided with an air passage manifold 5, which facilitates the connection of pneumatic components in the print head assembly to the air source. Three sets of guide shafts 222 arranged in a triangular pattern are connected to the module slide 221, which further facilitates the mutual support of the module slide 221, while improving the resistance of the module slide 221 in the vertical or horizontal direction during transmission and making it less prone to deformation, effectively reducing the wear of the bearing bushings in the module slide 221.

[0047] The main surface of the anti-loosening block 225 has a connection port 2251 adapted to the guide shaft, and the main surface of the anti-loosening block 225 also has a connection hole 2252. The anti-loosening block 225 is connected to the module slide 221 by a connecting rod passing through the connection hole 2252.

[0048] See Figure 11 The stroke adjustment assembly 24 includes a tensioning block 241. The main surface of the tensioning block 241 has an assembly port 2411 corresponding to the three sets of guide shafts 222. A buffer member 242 is provided through the main surface of the tensioning block 241. A clamping opening 2412 communicating with the assembly port 2411 is provided on one short side end face of the tensioning block 241. Bolt holes communicating with the clamping opening 2412 are provided on the top and bottom surfaces of the tensioning block 241. The tension of the clamping opening 2412 is adjusted by bolts 244 passing through the bolt holes. A sensor 245 is provided on the top surface of the tensioning block 241. The position of the sensor 245 changes when the pneumatic module stroke is adjusted, and the sensor 245 provides a real-time start / stop signal to the control system. Because the stroke adjustment assembly 24 is installed within the module frame 21, this reduces its space occupation without affecting its adjustment and use.

[0049] Working principle: The rodless cylinder 23 drives the cylinder slider 231 and the module slide 221 to move along the axial direction. Since the module slide 221 is connected to the three sets of guide shafts 222 through the bushing 223 and bearing 224, the entire operation process achieves high speed, stability and smooth movement. The print head module 1 is connected to the bottom front end of the bridge plate 227 through the print head support plate 11 and moves along the axial direction under the drive of the bridge plate 227. The doctor blade assembly 3 and the return blade assembly 4 on the print head module 1 realize the switching operation of scraping and returning oil under the drive of the double stroke cylinder.

Claims

1. A pneumatic screen printing scraper mechanism, comprising a print head module (1) and a pneumatic module (2), characterized in that, The print head module (1) includes a print head support plate (11) and multiple sets of double-stroke cylinders (12) disposed on both sides of the top surface of the print head support plate (11). The print head module (1) is disposed on the lower front surface of the bridge plate (227) on the pneumatic module (2) via the print head support plate (11). Two sets of double-stroke cylinders in the multiple sets of double-stroke cylinders (12) are connected to the doctor blade assembly (3) via the cylinder shaft, and the other two sets of double-stroke cylinders are connected to the return ink blade assembly (4) via the cylinder shaft.

2. The pneumatic screen printing scraper mechanism according to claim 1, characterized in that, The doctor blade assembly (3) includes a double-ended connecting rod (31), which includes an integrally formed connector (311) and a rod body (312). The connector (311) is located at the first and second ends of the rod body (312). One end of the connector (311) has a through-type circular groove (3111) on its main surface, and the other end of the connector (311) has a through-type elliptical groove (3113) on its main surface. Both ends of the connector (311) have through-type bayonet openings (3112) on their sides that communicate with the through-type circular groove (3111) and the through-type elliptical groove (3113). The rod body (312) is provided with two sets of clamping parts (32). The lower part of the two sets of clamping parts (32) is connected to a doctor blade clamp (33). The lower part of the doctor blade clamp (33) is provided with a doctor blade (34).

3. The pneumatic screen printing scraper mechanism according to claim 1, characterized in that, The ink return blade assembly (4) includes a double-ended connecting rod (41), which includes an integrally formed connector (411) and a rod body (412). The connector (411) is located at the first and second ends of the rod body (412). One end of the connector (411) has a through-type circular groove (4111) on its main surface, and the other end of the connector (411) has a through-type elliptical groove (4113) on its main surface. Both ends of the connector (411) have through-type bayonet (4112) on their sides that communicate with the through-type circular groove (4111) and the through-type elliptical groove (4113). The rod body (412) is provided with two sets of clamping parts (42). The lower part of the two sets of clamping parts (42) is connected to an ink return blade plate (43). The lower part of the ink return blade plate (43) is provided with an ink return blade (44).

4. The pneumatic screen printing scraper mechanism according to claim 1, characterized in that, The cylinder shaft (121) on the double-stroke cylinder (12) has a connector (123) at the end of the guide sleeve (122) through which it passes. The lower part of the connector (123) has a flat cut surface (1231) that is compatible with the bayonet. The flat cut surface (1231) has a through hole (1232) that corresponds to the connection hole.

5. The pneumatic screen printing scraper mechanism according to claim 1, characterized in that, A tracheal stent (13) is provided on the side of the printhead support plate (11).

6. The pneumatic screen printing scraper mechanism according to claim 1, characterized in that, The pneumatic module (2) includes a module frame (21), a module slide assembly (22) is provided inside the module frame (21), a rodless cylinder (23) is provided on the upper part of the module frame (21), and stroke adjustment components (24) are provided at both ends of the module slide assembly (22). The module slide assembly (22) is connected to the cylinder slider (231) of the rodless cylinder (23) through the module slide base (221).

7. The pneumatic screen printing scraper mechanism according to claim 6, characterized in that, The module frame (21) is composed of two short side fixing plates (211) and two long side fixing plates (212). One short side fixing plate (211) has a clearance hole (2111) and a guide shaft through hole (2112) on its main surface. The bottom surface of the short side fixing plate (211) has a bolt hole (2113) that communicates with the guide shaft through hole (2112). The other short side fixing plate (211) has a clearance hole (2111) and a step hole (2114) on its main surface. The top surface of the two short side fixing plates (211) has a blind hole (2115). The two long side fixing plates (212) have several through threaded holes (2121) on their sides.

8. The pneumatic screen printing scraper mechanism according to claim 6, characterized in that, The module slide assembly (22) includes a module slide (221) and three sets of guide shafts (222). The three sets of guide shafts (222) are triangularly connected through the module slide (221). Their ends are connected to the guide shaft through holes (2112) and stepped holes (2114) of the short side fixing plate (211). The module slide (221) is provided with bushings (223) and bearings (224). The outer side of the short side of the module slide (221) is provided with anti-loosening blocks (225). The top surface of the module slide (221) A slot (2211) is provided to connect with the cylinder slider (231). A sensor plate (226) is provided on one side of the slot (2211). A bridge plate (227) is provided on the bottom surface of the module slide (221). The length of the bridge plate (227) is greater than that of the module slide (221). The upper surface of the rear end of the bridge plate (227) is fixedly connected to the module slide (221). The lower surface of the front end of the bridge plate (227) is fixedly connected to the middle of the top surface of the print head support plate (11). An air passage manifold (5) is provided at the bottom of the bridge plate (227).

9. The pneumatic screen printing scraper mechanism according to claim 8, characterized in that, The main surface of the anti-loosening block (225) is provided with a connection port (2251) adapted to the guide shaft, and the main surface of the anti-loosening block (225) is also provided with a connection hole (2252). The anti-loosening block (225) is connected to the module slide (221) by passing a connecting rod through the connection hole (2252).

10. The pneumatic screen printing scraper mechanism according to claim 6, characterized in that, The stroke adjustment component (24) includes a tension fixing block (241). The main surface of the tension fixing block (241) is provided with an assembly port (2411) corresponding to the three sets of guide shafts (222). The main surface of the tension fixing block (241) is provided with a buffer component (242) that is connected through. One short side end face of the tension fixing block (241) is provided with a clamp (2412) that communicates with the assembly port (2411). The top and bottom surfaces of the tension fixing block (241) are provided with bolt holes that communicate with the clamp (2412). The tension of the clamp (2412) is adjusted by inserting a bolt (244) through the bolt hole. A sensor (245) is provided on the top surface of the tension fixing block (241).

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