CN214821758U

CN214821758U - Sliding frame structure for screen printing

Info

Publication number: CN214821758U
Application number: CN202121572202.5U
Authority: CN
Inventors: 周联
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2021-11-23
Anticipated expiration: 2031-07-12

Abstract

The utility model discloses a sliding frame structure for screen printing, which comprises a base plate (1), wherein a driving rod (2) is arranged below the base plate (1), and a driving part is connected between the driving rod (2) and the base plate (1); fixed blocks (8) are fixed at positions corresponding to two end parts of the driving rod (2) below the substrate (1), and the driving rod (2) is rotatably connected with the fixed blocks (8); both ends of the driving rod (2) are connected with swinging parts, a scraper part is connected between one corresponding ends of the two swinging parts, and an ink return knife part is connected between the other corresponding ends of the two swinging parts; the driving part can drive the driving rod to rotate forward and backward, so that the scraping knife parts and the ink returning knife parts at two ends of the swinging part can swing up and down alternately. The utility model discloses not only can reduce equipment cost, still have the action and carry out that to consume gas less, the stamp effect is better, application scope is wider and scrape the great advantage of china ink pressure control range.

Description

Sliding frame structure for screen printing

Technical Field

The utility model relates to a printing equipment, especially a balladeur train structure for screen printing.

Background

At present, in the existing screen printing machine, ink scraping action is completed by a carriage structure on a printing arm; in the common carriage structure, the two ends of the scraper and the ink return knife are connected with telescopic driving parts, and when the carriage moves back and forth along the printing arm, the 4 telescopic driving parts drive the scraper and the ink return knife to alternately move up and down. The sliding frame structure needs 4 telescopic driving parts, so that the equipment cost is high, and the operation is more gas-consuming; and the flexible drive division of scraper both ends and the flexible drive division of ink return knife both ends are difficult to realize accurate synchronization when stretching out and drawing back the action, lead to the stamp effect relatively poor. Therefore, the existing slide frame structure for screen printing has the problems of higher equipment cost, more gas consumption for action execution and poorer printing effect.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a balladeur train structure for screen printing. The utility model discloses not only can reduce equipment cost, still have the action and carry out the advantage that consumes gas less and the stamp effect is better.

The technical scheme of the utility model: a sliding frame structure for screen printing comprises a substrate, wherein a driving rod is arranged below the substrate, and a driving part is connected between the driving rod and the substrate; fixed blocks are fixed at positions corresponding to two end parts of the driving rod below the substrate, and the driving rod is rotatably connected with the fixed blocks; the two ends of the driving rod are connected with swinging parts, a scraper part is connected between one corresponding ends of the two swinging parts, and an ink return knife part is connected between the other corresponding ends of the two swinging parts; the driving part can drive the driving rod to rotate forward and backward, so that the scraping knife parts and the ink returning knife parts at two ends of the swinging part can swing up and down alternately.

In the above sliding frame structure for screen printing, the driving portion is a cylinder fixed on the substrate, and a telescopic rod of the cylinder can drive the driving rod to swing when extending; the cylinder telescopic link is connected with the adjusting nut, and the adjusting nut can adjust the maximum extension distance of the cylinder telescopic link.

In the foregoing sliding frame structure for screen printing, the swing portion includes an upper swing link and a lower swing link which are distributed in parallel up and down; the two end parts of the upper swing rod are respectively and rotatably connected with the scraper part and the ink return blade part, and the two end parts of the lower swing rod are respectively and rotatably connected with the scraper part and the ink return blade part; the connecting position of the upper swing rod corresponding to the scraper part and the connecting position of the lower swing rod corresponding to the scraper part are positioned on the same vertical line; the connecting position of the upper swing rod corresponding to the ink returning blade part and the connecting position of the lower swing rod corresponding to the ink returning blade part are positioned on the same vertical line.

In the above sliding frame structure for screen printing, the middle part of the lower swing rod is rotatably connected with the fixed block; the end part of the driving rod penetrates through the fixed block and is rotatably arranged in the upper swing rod, and the side surface of the end part of the driving rod is provided with a swing piece protruding outwards.

In the above sliding frame structure for screen printing, a cavity is provided in the position corresponding to the swinging piece in the upper swing rod, and gaps are provided between the inner wall of the cavity and the upper and lower surfaces of the swinging piece; and a spring cylinder is fixed at the position of the top end of the upper swing rod corresponding to the swing sheet and is positioned on one side, close to the ink return blade part, of the upper swing rod.

In the foregoing sliding frame structure for screen printing, the swinging piece penetrates through and is fixed at the end of the driving rod, and both ends of the swinging piece protrude outside the driving rod.

In the above sliding frame structure for screen printing, the telescopic rod of the cylinder is located on one side of the driving rod close to the scraper part; the bottom of cylinder telescopic link rotates and is connected with the connector link, rotates on the connector link to be connected with the fixation clamp of fixing on the actuating lever.

In the above sliding frame structure for screen printing, the scraper part comprises a scraper shaft, a scraper holder is connected to the scraper shaft, and a scraper is detachably connected to the scraper holder; both ends of the scraper shaft are connected with scraper adjusting threaded rods which are vertically arranged, and one end of the swinging part is rotatably connected to the scraper adjusting threaded rods; a scraper adjusting nut is in threaded connection with each scraper adjusting threaded rod, and the nut of each scraper adjusting nut is positioned above the substrate; the ink returning cutter part comprises an ink returning cutter shaft, an ink returning cutter clamp is connected to the ink returning cutter shaft, and an ink returning cutter is detachably connected to the ink returning cutter clamp; two end parts of the ink returning cutter shaft are connected with vertically arranged ink returning cutter adjusting threaded rods, and the other end part of the swinging part is rotatably connected to the ink returning cutter adjusting threaded rods; each ink return knife adjusting threaded rod is in threaded connection with an ink return knife adjusting nut, and the nut of the ink return knife adjusting nut is positioned above the substrate; waist holes are formed in the positions, corresponding to the scraper adjusting nuts and the ink return knife adjusting nuts, of the screws on the base plate.

In the sliding frame structure for screen printing, the scraper clamp is rotatably sleeved outside the scraper shaft, and a fixing screw for fixing the scraper clamp and the scraper shaft is connected to the scraper clamp through a thread; an angle dial is fixed on one side of the scraper adjusting threaded rod, and an angle pointer arranged corresponding to the angle dial is fixed on the scraper holder.

Compared with the prior art, the driving rod is rotatably arranged between the fixed blocks at the two end parts below the substrate, and the single driving part is used for driving the driving rod to rotate back and forth, so that the swinging parts at the two end parts of the driving rod swing, the alternate up-and-down swinging action of the scraper part and the ink return knife part is completed, the action execution consumes less air, and the equipment cost is lower; and the driving rod can synchronously drive the swinging parts at the two end parts to swing when rotating, so that the swinging parts at the two sides can accurately swing synchronously, ink scraping of the scraper part and ink returning of the ink returning cutter part are uniform, and the printing effect is improved. In addition, the driving part in the utility model is a cylinder (the model can be SDAJ40-20-15), and the maximum extension distance of the telescopic rod of the cylinder can be adjusted by adjusting the nut, so as to control the maximum descending distance of the scraper part, so as to adapt to the printing of various thickness silk screens or adjust and control the pressure between the flexible scraper and the silk screen on the scraper part; the cylinder is connected with the driving rod through the connecting buckle and the fixing clamp, so that the telescopic rod in the cylinder can drive the driving rod to rotate back and forth within a certain angle range; when the telescopic rod in the cylinder extends, the scraper part extends downwards, and the ink returning cutter part is lifted upwards; when the telescopic rod in the cylinder is shortened, the ink returning cutter part extends downwards, and the scraper part is lifted upwards, so that the control is more convenient; meanwhile, an operator can regulate and control the pressure of the scraper part during ink scraping by regulating the air pressure in the air cylinder, so that the printing machine can adapt to printing operation of various patterns and materials; however, the on-off of the electromagnetic valve of the air cylinder is influenced when the air pressure is too low to be 0.5Mpa, so that the control of the low-pressure state is difficult to realize only by the air cylinder; the scraper part and the ink returning cutter part are vertically connected to the upper swing rod and the lower swing rod which are arranged in parallel up and down, so that a parallelogram is formed among the scraper part, the ink returning cutter part, the upper swing rod and the lower swing rod, the scraper part and the ink returning cutter part can be kept vertical when swinging up and down and translating along the printing arm, and the printing effect is better; the driving rod drives the upper swing rod to swing through the swing piece with the end part protruding outwards, a cavity is arranged at the position of the upper swing rod corresponding to the swing piece, a spring cylinder is arranged above the swing piece, and a telescopic rod of the spring cylinder abuts against the swing piece; the cylinder extends to drive the driving rod to rotate through the connecting buckle and the fixing clamp, the swinging piece at the end part of the driving rod drives the upper swinging rod to swing through the spring cylinder, and the scraper part at the end part of the upper swinging rod moves downwards to be close to the silk screen; the flexible scraper on the scraper part is abutted against the silk screen to scrape ink, at the moment, when gaps exist between the swinging piece and the cavity in the vertical rotating swinging direction, the pressure of the scraper part on the silk screen is provided by a spring cylinder (the model can be SDA12 multiplied by 10B) abutted against the swinging piece, and the pressure between the scraper and the silk screen can be regulated and controlled in a low pressure range (when the pressure between the scraper and the silk screen is in the low pressure range (0.1-0.5 Mpa), the scraper is more suitable for fine and smooth pattern printing; if the swinging piece compresses the telescopic rod of the spring cylinder and abuts against the inner wall of the cavity, the pressure of the scraper part abutting against the silk screen is directly provided by the cylinder, and the pressure between the scraper and the silk screen can be regulated and controlled within a high-pressure range (0.5-5 Mpa) by regulating the pressure in the cylinder, so that the large-range ink scraping pressure regulation is realized; the scraper adjusting threaded rod in the scraper part is matched with the scraper adjusting nut, so that the maximum descending distance of the scraper part can be limited, and the scraper can be abutted against a silk screen to scrape ink when the scraper part reaches the maximum descending distance; the ink returning blade adjusting threaded rod in the ink returning blade part is matched with the ink returning blade adjusting nut, so that the maximum descending distance of the ink returning blade part can be limited, the ink returning blade is positioned above the silk screen when the ink returning blade part reaches the maximum descending distance, and ink can be uniformly coated on the silk screen when the ink returning blade moves back; the waist hole on the base plate can lead the scraper adjusting screw cap and the ink return knife adjusting screw cap to swing normally; the scraper clamp is rotatably sleeved outside the scraper shaft and is fixed through a fixing screw, and the angle of the scraper clamp is adjusted according to the printed patterns and the materials, so that the angle of the scraper is adjusted, and the printing effect is improved. Therefore, the utility model discloses not only can reduce equipment cost, still have the action and carry out that to consume gas less, the stamp effect is better, application scope is wider and the great advantage of wiping pressure control range.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of a connection structure of a substrate and a fixing block;

FIG. 3 is a schematic view showing a connection structure of a driving rod and a cylinder;

FIG. 4 is a schematic diagram of a spring cylinder controlling scraper pressure;

fig. 5 is a schematic diagram of the structure of the air cylinder for controlling the pressure of the scraper.

The labels in the figures are: 1-base plate, 2-driving rod, 3-air cylinder, 4-connecting buckle, 5-fixing clamp, 6-upper swing rod, 7-lower swing rod, 8-fixing block, 9-swinging piece, 10-cavity, 11-spring air cylinder, 13-scraper shaft, 14-scraper holder, 15-scraper, 16-scraper adjusting threaded rod, 17-scraper adjusting nut, 18-ink-returning blade shaft, 19-ink-returning blade holder, 20-ink-returning blade, 21-ink-returning blade adjusting threaded rod, 22-ink-returning blade adjusting nut, 23-waist hole, 24-fixing screw, 25-angle scale, 26-angle pointer and 27-adjusting nut.

Detailed Description

The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.

Examples are given. A sliding frame structure for screen printing is composed of a base plate 1, a driving rod 2 arranged under the base plate 1, and a driving part connected between the driving rod 2 and the base plate 1; fixed blocks 8 are fixed at positions corresponding to two end parts of the driving rod 2 below the substrate 1, and the driving rod 2 is rotatably connected with the fixed blocks 8; the two ends of the driving rod 2 are both connected with swinging parts, a scraper part is connected between the corresponding ends of the two swinging parts, and an ink return knife part is connected between the corresponding other ends of the two swinging parts; the driving part can drive the driving rod to rotate forward and backward, so that the scraping knife parts and the ink returning knife parts at two ends of the swinging part can swing up and down alternately.

The driving part is a cylinder 3 fixed on the substrate 1, and a telescopic rod of the cylinder 3 can drive the driving rod 2 to swing when being stretched; the telescopic rod of the cylinder 3 is connected with an adjusting nut 27, and the adjusting nut 27 can adjust the maximum extension distance of the telescopic rod of the cylinder 3; the swinging part comprises an upper swinging rod 6 and a lower swinging rod 7 which are distributed in parallel up and down; two end parts of the upper swing rod 6 are respectively and rotatably connected with the scraper part and the ink return blade part, and two end parts of the lower swing rod 7 are respectively and rotatably connected with the scraper part and the ink return blade part; the connecting position of the upper swing rod 6 corresponding to the scraper part and the connecting position of the lower swing rod 7 corresponding to the scraper part are positioned on the same vertical line; the connecting position of the upper swing rod 6 corresponding to the ink returning blade part and the connecting position of the lower swing rod 7 corresponding to the ink returning blade part are positioned on the same vertical line; the middle part of the lower swing rod 7 is rotatably connected with the fixed block 8; the end part of the driving rod 2 penetrates through the fixed block 8 and is rotatably arranged in the upper swing rod 6, and the side surface of the end part of the driving rod 2 is provided with a swing sheet 9 protruding outwards; a cavity 10 is arranged at the position, corresponding to the swinging piece 9, in the upper swinging rod 6, and gaps are formed between the inner wall of the cavity 10 and the upper surface and the lower surface of the swinging piece 9; a spring cylinder 11 is fixed at the position, corresponding to the swinging piece 9, of the top end of the upper swinging rod 6, and the spring cylinder 11 is positioned on one side, close to the ink returning blade part, of the upper swinging rod 6; the swinging piece 9 penetrates through and is fixed at the end part of the driving rod 2, and two ends of the swinging piece 9 are protruded outside the driving rod 2; the telescopic rod of the cylinder 3 is positioned on one side of the driving rod 2 close to the scraper part; the bottom end of the telescopic rod of the cylinder 3 is rotatably connected with a connecting buckle 4, and the connecting buckle 4 is rotatably connected with a fixing clamp 5 fixed on the driving rod 2; the scraper part comprises a scraper shaft 13, a scraper holder 14 is connected to the scraper shaft 13, and a scraper 15 is detachably connected to the scraper holder 14; both ends of the scraper shaft 13 are connected with scraper adjusting threaded rods 16 which are vertically arranged, and one end of the swinging part is rotatably connected to the scraper adjusting threaded rods 16; a scraper adjusting nut 17 is in threaded connection with each scraper adjusting threaded rod 16, and the nut of each scraper adjusting nut 17 is positioned above the substrate 1; the ink returning blade part comprises an ink returning blade shaft 18, an ink returning blade clamp 19 is connected to the ink returning blade shaft 18, and an ink returning blade 20 is detachably connected to the ink returning blade clamp 19; two end parts of the ink return blade shaft 18 are both connected with an ink return blade adjusting threaded rod 21 which is vertically arranged, and the other end part of the swinging part is rotatably connected on the ink return blade adjusting threaded rod 21; an ink return blade adjusting screw cap 22 is in threaded connection with each ink return blade adjusting threaded rod 21, and the screw cap of the ink return blade adjusting screw cap 22 is positioned above the substrate 1; waist holes 23 are formed in the positions, corresponding to the screw rods of the scraper adjusting screw cap 17 and the ink return blade adjusting screw cap 22, of the substrate 1; the scraper clamp 14 is rotatably sleeved outside the scraper shaft 13, and a fixing screw 24 for fixing the scraper clamp 14 and the scraper shaft 13 is connected to the scraper clamp 14 in a threaded manner; an angle dial 25 is fixed on one side of the scraper adjusting threaded rod 16, and an angle pointer 26 corresponding to the angle dial 25 is fixed on the scraper holder 14.

The working principle is as follows: the worker adjusts the position of the scraper adjusting nut 17 on the scraper adjusting threaded rod 16, so that when the nut at the top end of the scraper adjusting nut 17 is clamped above the waist hole 23 of the substrate 1, the scraper 15 reaches the maximum descending distance and is abutted against the silk screen; the scraper 15 can scrape the ink off the screen as the substrate 1 slides over the printing arm. And the position of the ink-returning blade adjusting screw cap 22 on the ink-returning blade adjusting screw rod 21 is adjusted, so that the ink-returning blade 20 reaches the maximum descending distance and is positioned above the silk screen when the screw cap at the top end of the ink-returning blade adjusting screw cap 22 is clamped above the waist hole 23 of the substrate 1; the ink return blade 20 is capable of laying the ink on the screen onto the screen as the substrate 1 slides over the printing arm.

When fine patterns on a printed product are printed, in order to avoid the fuzzy deformation of the patterns caused by overlarge ink scraping pressure, a low-pressure state is required; at this time, the adjusting nut 27 on the cylinder 3 needs to be adjusted, so that when the cylinder 3 reaches the maximum extension distance, the swinging piece 9 at the end of the driving rod 2 abuts against the telescopic rod on the spring cylinder 11, and a gap exists between the swinging piece 9 and the cavity 10 in the vertical rotating and swinging directions; at this time, the pressure of the flexible scraper 15 against the silk screen for scraping the ink is provided by two spring air cylinders 11; the pressure of the scraper 15 against the silk screen can be further adjusted by adjusting the pressure on the spring air cylinders 11, and the two spring air cylinders 11 do not need to exchange air, so that the air is saved during working.

When printing large patterns or products needing to be pressed heavily, a high-pressure state is needed; at this time, only the adjusting nut 27 needs to be rotated to enable the cylinder 3 to reach the maximum extension distance, the swinging piece 9 at the end part of the driving rod 2 compresses the telescopic rod on the spring cylinder 11, and one end of the swinging piece 9 which swings upwards directly abuts against the inner wall of the cavity 10; at the moment, the spring cylinder 11 is invalid, and the swinging sheet 9 directly transmits the force to the upper swinging rod 6; the pressure of the flexible scraper 15 against the screen for scraping the ink is provided directly by the cylinder 3, and the pressure on the cylinder 3 can be adjusted to adjust the pressure on the scraper 15.

During actual work, the telescopic rod on the air cylinder 3 extends, the driving rod 2 is driven to rotate between the two fixed blocks 8 through the connecting buckle 4 and the fixing clamp 5, and the swinging piece 9 at the end part of the driving rod 2 also synchronously rotates, so that the upper swinging rod 6 is driven to swing; one ends of the upper swing rod 6 and the lower swing rod 7 are rotatably connected to the vertically arranged scraper adjusting threaded rod 16, the other ends of the upper swing rod 6 and the lower swing rod 7 are rotatably connected to the vertically arranged ink return knife adjusting threaded rod 21, and the upper swing rod 6 and the lower swing rod 7 are arranged in parallel to each other, so that the upper swing rod 6, the lower swing rod 7, the scraper adjusting threaded rod 16 and the ink return knife adjusting threaded rod 21 form a parallelogram; when the upper swing rod 6 swings, the lower swing rod 7 can swing synchronously, the scraper adjusting threaded rod 16 and the ink return blade adjusting threaded rod 21 can always keep vertical, and the scraper adjusting screw cap 17 and the ink return blade adjusting screw cap 22 swing in the waist hole 23; the doctor shaft 13, the doctor holder 14 and the doctor blade 15 are all brought down close to and against the web, and the ink return shaft 18, the ink return holder 19 and the ink return blade 20 are all brought up away from the web; the substrate 1 is then slid over the printing arm and the doctor blade 15 scrapes the ink over the screen.

Then, the cylinder 3 shortens the telescopic rod, the driving rod 2 is driven to rotate reversely, and the upper swing rod 6 synchronously swings reversely; the upper swing rod 6 and the lower swing rod 7 swing synchronously, the ink returning blade shaft 18, the ink returning blade clamp 19 and the ink returning blade 20 are all close to the silk screen downwards, and the scraper shaft 13, the scraper clamp 14 and the scraper 15 are all far away from the silk screen upwards; the substrate 1 is slid back over the printing arm and the ink return blade 20 reappears the ink to the screen.

The scraper holder 14 is rotatably sleeved outside the scraper shaft 13 and is fixed by a fixing screw 24; when the scraper holder 14 rotates relative to the scraper shaft 13, an angle pointer 26 on the scraper holder 14 can indicate an angle disc 25 on the scraper adjusting threaded rod 16, and the angle of the scraper 15 can be adjusted properly according to printing patterns and materials, so that the printing effect is improved.

Claims

1. The utility model provides a balladeur train structure for screen printing which characterized in that: the device comprises a substrate (1), wherein a driving rod (2) is arranged below the substrate (1), and a driving part is connected between the driving rod (2) and the substrate (1); fixed blocks (8) are fixed at positions corresponding to two end parts of the driving rod (2) below the substrate (1), and the driving rod (2) is rotatably connected with the fixed blocks (8); both ends of the driving rod (2) are connected with swinging parts, a scraper part is connected between one corresponding ends of the two swinging parts, and an ink return knife part is connected between the other corresponding ends of the two swinging parts; the driving part can drive the driving rod to rotate forward and backward, so that the scraping knife parts and the ink returning knife parts at two ends of the swinging part can swing up and down alternately.

2. The carriage structure for screen printing according to claim 1, wherein: the driving part is a cylinder (3) fixed on the substrate (1), and a telescopic rod of the cylinder (3) can drive the driving rod (2) to swing when being stretched; the telescopic rod of the cylinder (3) is connected with an adjusting nut (27), and the adjusting nut (27) can adjust the maximum extension distance of the telescopic rod of the cylinder (3).

3. The carriage structure for screen printing according to claim 2, wherein: the swinging part comprises an upper swinging rod (6) and a lower swinging rod (7) which are distributed in parallel up and down; two end parts of the upper swing rod (6) are respectively and rotatably connected with the scraper part and the ink return blade part, and two end parts of the lower swing rod (7) are respectively and rotatably connected with the scraper part and the ink return blade part; the connecting position of the upper swing rod (6) corresponding to the scraper part and the connecting position of the lower swing rod (7) corresponding to the scraper part are positioned on the same vertical line; the connecting position of the upper swing rod (6) corresponding to the ink returning blade part and the connecting position of the lower swing rod (7) corresponding to the ink returning blade part are positioned on the same vertical line.

4. The carriage structure for screen printing according to claim 3, wherein: the middle part of the lower swing rod (7) is rotatably connected with the fixed block (8); the end part of the driving rod (2) penetrates through the fixing block (8) to be rotatably arranged in the upper swing rod (6), and the side surface of the end part of the driving rod (2) is provided with a swing sheet (9) protruding outwards.

5. The carriage structure for screen printing according to claim 4, wherein: a cavity (10) is arranged at the position, corresponding to the swinging piece (9), in the upper swinging rod (6), and gaps are formed between the inner wall of the cavity (10) and the upper surface and the lower surface of the swinging piece (9); a spring cylinder (11) is fixed at the position, corresponding to the swinging piece (9), of the top end of the upper swinging rod (6), and the spring cylinder (11) is located on one side, close to the ink return blade part, of the upper swinging rod (6).

6. The carriage structure for screen printing according to claim 4, wherein: the swing piece (9) penetrates through and is fixed at the end part of the driving rod (2), and two ends of the swing piece (9) are protruded out of the outer side of the driving rod (2).

7. The carriage structure for screen printing according to claim 2, wherein: the telescopic rod of the cylinder (3) is positioned on one side, close to the scraper part, of the driving rod (2); the bottom of cylinder (3) telescopic link rotates and is connected with connector link (4), rotates on connector link (4) and is connected with fixation clamp (5) of fixing on actuating lever (2).

8. The carriage structure for screen printing according to any one of claims 1 to 7, wherein: the scraper part comprises a scraper shaft (13), a scraper holder (14) is connected to the scraper shaft (13), and a scraper (15) is detachably connected to the scraper holder (14); both ends of the scraper shaft (13) are connected with scraper adjusting threaded rods (16) which are vertically arranged, and one end of the swinging part is rotatably connected to the scraper adjusting threaded rods (16); a scraper adjusting nut (17) is in threaded connection with each scraper adjusting threaded rod (16), and the nut of each scraper adjusting nut (17) is positioned above the substrate (1); the ink returning blade part comprises an ink returning blade shaft (18), an ink returning blade holder (19) is connected to the ink returning blade shaft (18), and an ink returning blade (20) is detachably connected to the ink returning blade holder (19); two end parts of the ink return blade shaft (18) are both connected with an ink return blade adjusting threaded rod (21) which is vertically arranged, and the other end part of the swinging part is rotatably connected to the ink return blade adjusting threaded rod (21); each ink return blade adjusting threaded rod (21) is in threaded connection with an ink return blade adjusting nut (22), and a nut of each ink return blade adjusting nut (22) is positioned above the substrate (1); waist holes (23) are formed in the positions, corresponding to the scraper adjusting nuts (17) and the ink return blade adjusting nuts (22), of the screws on the base plate (1).

9. The carriage structure for screen printing according to claim 8, wherein: the scraper holder (14) is rotatably sleeved outside the scraper shaft (13), and a fixing screw (24) for fixing the scraper holder (14) and the scraper shaft (13) is connected to the scraper holder (14) in a threaded manner; an angle dial (25) is fixed on one side of the scraper adjusting threaded rod (16), and an angle pointer (26) which is arranged corresponding to the angle dial (25) is fixed on the scraper clamp (14).