Scraper mechanism and screen printing device

Abstract

The utility model relates to the technical field of silk-screen printing, in particular to a scraper mechanism and a silk-screen printing device. The scraper mechanism comprises a lifting driving assembly, a scraper assembly, a material barrel frame, a feeding block, a mounting frame and a sleeve. The lifting driving assembly, the scraper assembly, the material barrel frame and the feeding block are all arranged on the mounting frame, and the lifting driving assembly is in transmission connection with the scraper assembly; the feeding block is provided with at least one feeding port and at least one discharging port. The sleeve is arranged on the material barrel frame and used for containing a material barrel with printing materials, an outlet of the material barrel is communicated with the feeding port through a feeding pipeline, and the printing materials flow out through the discharging port. The material barrel is arranged on the material barrel frame, the distance between the material barrel and the feeding block is closer, the length of the feeding pipeline can be shortened, when the mounting frame moves, the material barrel and the scraper assembly can synchronously move, the feeding pipeline is prevented from interfering with movement, and meanwhile the sleeve is arranged outside the material barrel in a sleeving mode to protect the material barrel.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of screen printing, in particular to a squeegee mechanism and a screen printing device. BACKGROUND

[0002] The screen printing device generally uses a squeegee mechanism to extrude printing materials through a screen printing plate to a printing object, and needs to supplement the printing materials on line during printing.

[0003] The existing squeegee mechanism is generally provided with a discharging plate, and a material bucket for storing the printing materials is generally arranged outside the screen printing device. A long feeding pipeline needs to be connected between the material bucket and the discharging plate. The material bucket is used to supply the printing materials to the discharging plate, and the printing materials are supplied to the screen printing plate below through the discharging plate. Since the squeegee mechanism needs to move along the screen printing plate to scrape the printing materials on the screen printing plate, the long feeding pipeline is prone to interfere with the movement of the squeegee mechanism, and is not convenient for equipment maintenance. UTILITY MODEL CONTENT

[0004] The application aims to provide a squeegee mechanism and a screen printing device to solve the technical problem that, in the prior art, since the squeegee mechanism needs to move along the screen printing plate to scrape the printing materials on the screen printing plate, the long feeding pipeline is prone to interfere with the movement of the squeegee mechanism, and is not convenient for equipment maintenance.

[0005] In a first aspect, the application provides a squeegee mechanism, which comprises a lifting driving assembly, a squeegee assembly, a material bucket rack, a feeding block, a mounting rack and a sleeve.

[0006] The lifting driving assembly, the squeegee assembly, the material bucket rack and the feeding block are all arranged on the mounting rack. The lifting driving assembly is drivingly connected to the squeegee assembly and is used to drive the squeegee assembly to lift. The feeding block is located on the inner side of the squeegee assembly. The feeding block is provided with a material cavity. The feeding block is provided with at least one feeding port and at least one discharging port, and the feeding port and the discharging port are both in communication with the material cavity.

[0007] The sleeve is arranged on the material bucket rack. The sleeve is used to contain the material bucket containing the printing materials. The outlet of the material bucket is in communication with the feeding port through a feeding pipeline. The printing materials flow out through the discharging port.

[0008] The squeegee mechanism provided by the application has the advantages that the lifting driving assembly, the squeegee assembly, the material bucket rack and the feeding block are all arranged on the mounting rack. The material bucket is arranged on the material bucket rack, so that the distance between the material bucket and the feeding block is shorter, the length of the feeding pipeline is shortened, and when the mounting rack moves to drive the squeegee assembly to scrape the printing materials on the screen printing plate, the material bucket and the squeegee assembly can move synchronously, so that the feeding pipeline does not interfere with the movement. Meanwhile, the sleeve is arranged outside the material bucket, which can protect the material bucket.

[0009] In an optional embodiment, the scraper mechanism further comprises a magnet and a magnetic switch;

[0010] The magnet is arranged on the piston in the bucket, and the magnet is configured to descend with the piston in the bucket, and push the printing material in the bucket out of the bucket when the piston descends;

[0011] The magnetic switch is arranged on the bucket frame and corresponds to the position of the bottom of the bucket, and the magnet is used to trigger the magnetic switch.

[0012] By arranging the magnet on the piston of the bucket, the magnet can descend with the piston when the piston descends, and the magnet can trigger the magnetic switch in time when the printing material in the bucket is used up, so as to timely replace the bucket.

[0013] In an optional embodiment, the feeding block has opposite first and second ends along the length direction of the feeding block;

[0014] The feeding block is provided with an inlet, and the inlet is located at the first end;

[0015] The feeding block is provided with a plurality of outlets along the length direction of the feeding block, and the diameters of the outlets gradually increase from the first end to the second end.

[0016] The printing material entering the feeding block from the inlet moves from the first end to the second end, and by gradually increasing the diameters of the outlets from the first end to the second end, the discharge amount of the outlet through which the printing material flows gradually increases, which can ensure the uniformity of the discharge of the feeding block.

[0017] In an optional embodiment, the scraper mechanism further comprises a fixing frame, and the feeding block is connected to the mounting frame through the fixing frame;

[0018] The fixing frame is provided with a material amount detection sensor, and the material amount detection sensor is used to detect the amount of printing material on the screen plate below the scraper mechanism.

[0019] The feeding block is connected to the mounting frame through the fixing frame, which is convenient to install, and the material amount detection sensor is arranged on the fixing frame to detect whether there is printing material on the screen plate in real time, which can timely reflect whether the amount of printing material on the screen plate meets the printing requirement, and ensure the printing effect.

[0020] In an optional embodiment, the scraper mechanism further comprises a connecting plate;

[0021] The lifting driving assembly comprises a first lifting driver and a second lifting driver, the first lifting driver is arranged on the mounting frame, the connecting plate is connected to the output end of the first lifting driver, and the second lifting driver is arranged on the connecting plate;

[0022] The scraper assembly comprises a first scraper frame, a first scraper, a second scraper frame and a second scraper, the first scraper frame is connected to the output end of the second lifting driver, the first scraper is connected to the first scraper frame, the second scraper frame is connected to the connecting plate, and the second scraper is connected to the second scraper frame.

[0023] The first lifting driver drives the connecting plate to lift, and the connecting plate drives the second lifting driver and the scraper assembly to lift synchronously, so that the distance between the scraper assembly and the screen plate is adjusted conveniently and simply.

[0024] In an optional embodiment, the scraper mechanism further comprises a limiting assembly arranged on the first scraper frame, the limiting assembly is correspondingly matched with the connecting plate, and is used for limiting the lifting stroke of the first scraper frame.

[0025] The limiting assembly comprises a buffer and a stopper, and the buffer and the stopper can be sequentially abutted against the connecting plate.

[0026] The upper side of the connecting plate is provided with the stopper and the buffer, and / or the lower side of the connecting plate is provided with the stopper and the buffer.

[0027] The limiting assembly limits the lifting stroke of the first scraper frame, so that the first scraper frame is prevented from lifting excessively, and meanwhile, in the lifting process of the first scraper frame, the connecting plate first contacts the buffer and then contacts the stopper, so that the first scraper frame is stopped after buffering, and damage is avoided.

[0028] In an optional embodiment, the sleeve comprises a barrel and a barrel cover, the bucket is arranged in the barrel, the barrel cover is detachably mounted on the upper end of the barrel, the barrel cover is provided with an air inlet, the air inlet is communicated with an external air source, and the gas entering the sleeve through the air inlet is used for pushing the piston in the bucket downward.

[0029] When the bucket is replaced, the bucket cover and the feeding pipeline can be screwed off, and the bucket can be taken out for replacement, so that the replacement is convenient; the external air source can push the piston in the bucket downward by injecting gas into the air inlet on the bucket cover, so that the printing material in the bucket is conveniently discharged.

[0030] In an optional embodiment, the bucket frame comprises a connecting portion and a bearing portion, the connecting portion is connected to one side of the mounting frame, and the sleeve is arranged on the bearing portion.

[0031] A simple-structured bucket frame is provided, which is convenient to install and can ensure the stability of the sleeve.

[0032] In an optional embodiment, the bucket frame further comprises a clamping seat and a movable buckle, the clamping seat is arranged on the connecting portion, one end of the movable buckle is rotationally connected with the clamping seat, and the other end is clamped with the clamping seat.

[0033] The positioning space is between the card seat and the movable buckle, and the sleeve is located in the positioning space.

[0034] The sleeve can be replaced by opening the movable buckle, and the sleeve is convenient to replace. The sleeve can be fixed by buckling the movable buckle, so as to ensure the stability of the sleeve.

[0035] In a second aspect, the application provides a screen printing device, which comprises the scraper mechanism, the horizontal movement driving mechanism and the screen plate according to any one of the preceding embodiments, wherein:

[0036] The scraper mechanism is arranged above the screen plate, and the printing material flows to the screen plate through the discharge port.

[0037] The horizontal movement driving mechanism is drivingly connected with the mounting frame, and is used for driving the scraper mechanism to horizontally move to scrape the printing material on the screen plate.

[0038] The screen printing device provided by the application comprises the scraper mechanism, so that the technical advantages and effects achieved by the scraper mechanism are achieved during the process that the horizontal movement driving mechanism drives the scraper mechanism to horizontally move, and the technical advantages and effects achieved by the scraper mechanism will not be described in detail here.

[0039] Other features and advantages of the application will be described in detail in the following specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0041] Figure 1 A side structure schematic view of the scraper mechanism provided by the embodiment of the application is shown in the figure;

[0042] Figure 2 Another side structure schematic view of the scraper mechanism provided by the embodiment of the application is shown in the figure;

[0043] Figure 3 A side schematic view of the sleeve when the sleeve is installed in the material bucket frame is shown in the figure;

[0044] Figure 4 Another side schematic view of the sleeve when the sleeve is installed in the material bucket frame is shown in the figure;

[0045] Figure 5 A sectional view along the line A-A in the figure; Figure 4

[0046] ​Figure 6 This is a schematic diagram of the structure of the feeding block and the fixing frame provided in the embodiments of this application;

[0047] Figure 7 This is a top view of the feeding block and the fixing frame provided in an embodiment of this application;

[0048] Figure 8 For along Figure 7 Sectional view of the middle BB line;

[0049] Figure 9 This is a schematic diagram of the screen printing apparatus provided in an embodiment of this application.

[0050] Icons: 1-Lifting drive assembly; 2-Scraper assembly; 3-Bug frame; 4-Feeding block; 5-Mounting bracket; 6-Sleeve; 7-Inlet; 8-Outlet; 9-Material chamber; 10-Magnet; 11-Fixing bracket; 12-Material quantity detection sensor; 13-Connecting plate; 14-First lifting driver; 15-Second lifting driver; 16-First scraper frame; 17-First scraper; 18-Second scraper frame; 19-Second scraper; 20-Buffer; 21-Stop; 22-Connecting part; 23-Bearing part; 24-Card holder; 25-Movable buckle; 26-Magnetic switch; 27-Bug; 28-Piston; 29-Horizontal movement drive mechanism; 30-Screen; 31-Cylinder body; 32-Cylinder cover; 33-Air inlet. Detailed Implementation

[0051] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In addition, the technical solutions among various embodiments can be combined with each other, but it must be based on the fact that the person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the present application.

[0055] The present application will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0056] The present embodiment provides a scraper mechanism, as shown in Figures 1 to 9 The scraper mechanism comprises: a lifting driving assembly 1, a scraper assembly 2, a bucket frame 3, a feeding block 4, a mounting frame 5 and a sleeve 6; the lifting driving assembly 1, the scraper assembly 2, the bucket frame 3 and the feeding block 4 are all arranged on the mounting frame 5, the lifting driving assembly 1 is drivingly connected to the scraper assembly 2 and is used to drive the scraper assembly 2 to lift and lower; the feeding block 4 is located at the inner side of the scraper assembly 2, the feeding block 4 is provided with a material cavity 9 therein, at least one feeding port 7 and at least one discharging port 8 are arranged on the feeding block 4, and the feeding port 7 and the discharging port 8 are both in communication with the material cavity 9; the sleeve 6 is arranged on the bucket frame 3, the sleeve 6 is used to contain a bucket 27 with printing material, the outlet of the bucket 27 is in communication with the feeding port 7 through a feeding pipeline, and the printing material flows out through the discharging port 8.

[0057] In the present embodiment, the lifting driving assembly 1, the scraper assembly 2, the bucket frame 3 and the feeding block 4 are all arranged on the mounting frame 5, by arranging the bucket 27 on the bucket frame 3, the distance between the bucket 27 and the feeding block 4 is closer, the length of the feeding pipeline can be shortened, and when the mounting frame 5 moves to drive the scraper assembly to scrape the printing material on the screen, the bucket 27 and the scraper assembly 2 can move synchronously, avoiding the interference of the feeding pipeline to the movement, and at the same time, a sleeve 6 is arranged outside the bucket 27, which can protect the bucket 27.

[0058] In the optional technical solution of the present embodiment, as shown in Figures 3 to 5As shown, the scraper mechanism further comprises a magnet 10 and a magnetic switch 26; the magnet 10 is arranged on a piston 28 in the bucket 27, and the magnet 10 is configured to descend with the piston 28 in the bucket 27, and the piston 28 pushes the printing material in the bucket 27 out of the bucket 27 when descending; the magnetic switch 26 is arranged on the bucket frame 3 and corresponds to the position of the bottom of the bucket 27, and the magnet 10 is used to trigger the magnetic switch 26.

[0059] In this embodiment, the magnet 10 is arranged above the piston 28 and can press on the piston 28 to rise and fall with the piston 28; the magnetic switch 26 is arranged on the bucket frame 3 and corresponds to the bottom of the bucket 27; the magnetic switch 26 can sense the magnet 10, and when the piston 28 descends to the bottom of the bucket 27, the magnetic switch 26 senses the magnet 10, the magnet 10 triggers the magnetic switch 26 to alarm and prompt that the printing material in the bucket 27 is used up. The arrangement of the magnet 10 and the magnetic switch 26 can timely detect whether the printing material in the bucket 27 is used up.

[0060] In an optional technical solution of this embodiment, as shown in the figure, Figures 6 to 8 As shown, the feeding block 4 has opposite first and second ends along the length direction of the feeding block 4; the feeding block 4 is provided with a feeding port 7, and the feeding port 7 is located at the first end; the feeding block 4 is provided with a plurality of discharging ports 8 along the length direction of the feeding block 4, and the diameters of the discharging ports 8 gradually increase from the first end to the second end.

[0061] The printing material entering through the feeding port 7 moves from the first end to the second end, and by setting the diameters of the discharging ports 8 to gradually increase from the first end to the second end, the discharging uniformity of the feeding block 4 can be ensured.

[0062] In an optional technical solution of this embodiment, as shown in the figure, Figures 6 to 8 As shown, the scraper mechanism further comprises a fixed frame 11, and the feeding block 4 is connected to the mounting frame 5 through the fixed frame 11, which is convenient for installation; the fixed frame 11 is provided with a material amount detection sensor 12, which is used to detect the amount of printing material on the screen plate 30 below the scraper mechanism, so as to timely reflect whether the amount of printing material on the screen plate 30 meets the printing requirement and ensure the printing effect.

[0063] The material amount detection sensor 12 can be a laser displacement sensor, which can determine whether the screen plate 30 has printing material and the thickness of the printing material by detecting the different displacement amounts when the screen plate 30 has printing material and lacks printing material; the material amount detection sensor 12 can also be a color sensor, which can determine whether the screen plate 30 has printing material by detecting the different color signals when the screen plate 30 has printing material and lacks printing material.

[0064] In an optional technical solution of the embodiment, as shown in Figure 1 and Figure 2 The scraper mechanism further comprises a connecting plate 13; the lifting driving assembly 1 comprises a first lifting driver 14 and a second lifting driver 15, the first lifting driver 14 is arranged on the mounting frame 5, the connecting plate 13 is connected to the output end of the first lifting driver 14, and the second lifting driver 15 is arranged on the connecting plate 13; the scraper assembly 2 comprises a first scraper frame 16, a first scraper 17, a second scraper frame 18 and a second scraper 19, the first scraper frame 16 is connected to the output end of the second lifting driver 15, the first scraper 17 is connected to the first scraper frame 16, the second scraper frame 18 is connected to the connecting plate 13, and the second scraper 19 is connected to the second scraper frame 18.

[0065] The first lifting driver 14 drives the connecting plate 13 to lift, and the connecting plate 13 drives the second lifting driver 15 and the scraper assembly 2 to lift synchronously, so that the distance between the scraper assembly 2 as a whole and the screen plate 30 is adjusted conveniently, and the first scraper frame 16 and the first scraper 17 are driven by the second lifting driver 15 to lift, so that the height difference between the first scraper 17 and the second scraper 19 is adjusted conveniently.

[0066] In the embodiment, the first lifting driver 14 can be a linear motor or a common linear driver such as a pneumatic cylinder, and the second lifting driver 15 can be a linear motor or a common linear driver such as a pneumatic cylinder.

[0067] It should be noted that the feeding block 4 is located between the first scraper 17 and the second scraper 19 to supplement the printing material on the screen plate 30 between the two scrapers.

[0068] In an optional technical solution of the embodiment, as shown in Figure 1 The scraper mechanism further comprises a limiting assembly arranged on the first scraper frame 16, the limiting assembly is correspondingly matched with the connecting plate 13, and is used for limiting the lifting stroke of the first scraper frame 16; the limiting assembly comprises a buffer 20 and a stopper 21, and the buffer 20 and the stopper 21 can be sequentially abutted against the connecting plate 13; the upper side of the connecting plate 13 is provided with the stopper 21 and the buffer 20, and / or the lower side of the connecting plate 13 is provided with the stopper 21 and the buffer 20.

[0069] Optionally, the first scraper frame 16 has a hollow hole, one end of the connecting plate 13 is located in the hollow hole, two sets of buffer members 20 and stop members 21 are arranged on the first scraper frame 16, one set of buffer members 20 and stop members 21 are located on the upper side of the connecting plate 13, and the buffer members 20 and the stop members 21 located on the upper side of the connecting plate 13 can be in turn abutted against the connecting plate 13 in the process that the second lifting driver 15 drives the first scraper frame 16 to descend, so that the first scraper frame 16 is limited to continue to descend; the other set of buffer members 20 and stop members 21 are located on the lower side of the connecting plate 13, and the buffer members 20 and the stop members 21 located on the lower side of the connecting plate 13 can be in turn abutted against the connecting plate 13 in the process that the second lifting driver 15 drives the first scraper frame 16 to ascend, so that the first scraper frame 16 is limited to continue to ascend; the limiting assembly has simple structure, the lifting stroke of the first scraper frame 16 is limited, the first scraper frame 16 is prevented from being excessively lifted, meanwhile, the connecting plate 13 is first in contact with the buffer members 20 and then in contact with the stop members 21, the first scraper frame 16 is stopped after buffering, and damage is avoided.

[0070] Optionally, the buffer member 20 can be a buffer or a buffer spring, and the stop member 21 can be a stop bolt, a stop rod or a stop block.

[0071] Optionally, as shown in Figure 5 the sleeve 6 includes a barrel 31 and a barrel cover 32, the barrel 31 is arranged in the barrel 31, the barrel cover 32 is detachably arranged on the upper end of the barrel 31, the barrel cover 32 is provided with an air inlet 33, the air inlet 33 is communicated with an external air source, and the gas entering the sleeve 6 through the air inlet 33 is used to push the piston 28 in the bucket 27 downward. When the bucket 27 is replaced, the barrel cover 32 and the feeding pipeline can be screwed off, and the bucket 27 can be taken out for replacement, so that the replacement is convenient; the external air source can push the piston 28 in the bucket 27 to move downward by injecting gas into the air inlet 33 on the barrel cover 32, so that the printing material in the bucket 27 is conveniently discharged.

[0072] Optionally, after the bucket 27 is arranged in the barrel 31 and the barrel cover 32 is covered, the lower end of the barrel cover 32 can abut against and seal the top opening of the bucket 27, so that the gas entering through the air inlet 33 can better push the piston 28 in the bucket 27.

[0073] Optionally, as shown in Figures 1 to 5 the bucket frame 3 includes a connecting portion 22 and a bearing portion 23, the connecting portion 22 is connected to one side of the mounting frame 5, and the sleeve 6 is arranged on the bearing portion 23. The bucket frame 3 has simple structure and is convenient to install, and can ensure the stability of the sleeve 6. Optionally, the feeding port 7 of the bucket frame 3 and the feeding block 4 is located on the same side of the mounting frame 5, so that the feeding pipeline is shorter. The magnetic switch 26 is arranged on the bearing portion 23.

[0074] Optionally, as shown inFigures 1 to 5 As shown, the bucket frame 3 further comprises a clamping seat 24 and a movable buckle 25, the clamping seat 24 is arranged on the connecting part 22, one end of the movable buckle 25 is rotationally connected with the clamping seat 24, and the other end is clamped with the clamping seat 24; the clamping seat 24 and the movable buckle 25 have a positioning space therebetween, and the sleeve 6 is located in the positioning space. The sleeve 6 can be replaced by opening the movable buckle 25, and the sleeve 6 is convenient to replace, and the sleeve 6 can be fixed by buckling the movable buckle 25, so as to ensure the stability of the sleeve 6.

[0075] The screen printing device provided by the embodiment comprises the scraper mechanism, a horizontal movement driving mechanism 29 and a screen plate 30, wherein: the scraper mechanism is arranged above the screen plate 30, and the printing material flows to the screen plate 30 through the discharge port 8; the horizontal movement driving mechanism 29 is drivingly connected with the mounting frame 5, and is used for driving the scraper mechanism to horizontally move to scrape the printing material on the screen plate 30. Figure 1 Figure 9 As shown, the screen printing device comprises the scraper mechanism, a horizontal movement driving mechanism 29 and a screen plate 30, wherein: the scraper mechanism is arranged above the screen plate 30, and the printing material flows to the screen plate 30 through the discharge port 8; the horizontal movement driving mechanism 29 is drivingly connected with the mounting frame 5, and is used for driving the scraper mechanism to horizontally move to scrape the printing material on the screen plate 30.

[0076] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.​

Claims

1. A doctor mechanism characterized by, The scraper mechanism comprises a lifting driving assembly, a scraper assembly, a bucket frame, a feeding block, a mounting frame and a sleeve; The lifting driving assembly, the scraper assembly, the bucket frame and the feeding block are arranged on the mounting frame, the lifting driving assembly is drivingly connected to the scraper assembly and is used to drive the scraper assembly to lift and descend, the feeding block is located at the inner side of the scraper assembly, a material cavity is arranged in the feeding block, at least one feeding port and at least one discharging port are arranged on the feeding block, and the feeding port and the discharging port are in communication with the material cavity; The sleeve is arranged on the bucket frame, the sleeve is used to contain a bucket with printing material, the outlet of the bucket is in communication with the feeding port through a feeding pipeline, and the printing material flows out through the discharging port.

2. The doctor mechanism of claim 1, wherein, The scraper mechanism further comprises a magnet and a magnetic switch; The magnet is arranged on a piston in the bucket, the magnet is configured to descend with the piston in the bucket, and the piston pushes the printing material in the bucket out of the bucket when descending; The magnetic switch is arranged on the bucket frame and corresponds to the position of the bottom of the bucket, and the magnet is used to trigger the magnetic switch.

3. The doctor mechanism of claim 1, wherein, The feeding block has opposite first and second ends along the length direction of the feeding block; One feeding port is arranged on the feeding block, and the feeding port is located at the first end; A plurality of discharging ports are arranged on the feeding block along the length direction of the feeding block, the diameters of the discharging ports gradually increase from the first end to the second end.

4. The doctor mechanism of claim 1, wherein, The scraper mechanism further comprises a fixing frame, and the feeding block is connected to the mounting frame through the fixing frame; A material amount detection sensor is arranged on the fixing frame, and the material amount detection sensor is used to detect the amount of printing material on a screen below the scraper mechanism.

5. The doctor mechanism of claim 1, wherein, The scraper mechanism further comprises a connecting plate; The lifting driving assembly comprises a first lifting driver and a second lifting driver, the first lifting driver is arranged on the mounting frame, the connecting plate is connected to the output end of the first lifting driver, and the second lifting driver is arranged on the connecting plate; The scraper assembly comprises a first scraper frame, a first scraper, a second scraper frame and a second scraper, the first scraper frame is connected to the output end of the second lifting driver, the first scraper is connected to the first scraper frame, the second scraper frame is connected to the connecting plate, and the second scraper is connected to the second scraper frame.

6. The doctor mechanism of claim 5, wherein, The scraper mechanism further comprises a limiting component arranged on the first scraper frame, the limiting component corresponds to the connecting plate and is used to limit the lifting stroke of the first scraper frame; The limiting component comprises a buffer and a stopper, and the buffer and the stopper can successively abut against the connecting plate; The upper side of the connecting plate is provided with the stopper and the buffer, and / or the lower side of the connecting plate is provided with the stopper and the buffer.

7. The doctor mechanism of claim 1 wherein, The sleeve comprises a barrel and a barrel cover, the barrel is arranged in the barrel, the barrel cover is detachably arranged on the upper end of the barrel, the barrel cover is provided with an air inlet, the air inlet is communicated with an external air source, and the gas entering the sleeve through the air inlet is used for pushing the piston in the barrel downward.

8. The doctor mechanism of any one of claims 1-7, wherein, The barrel frame comprises a connecting part and a bearing part, the connecting part is connected to one side of the mounting frame, and the sleeve is arranged on the bearing part.

9. The doctor mechanism of claim 8, wherein, The barrel frame further comprises a clamping seat and a movable buckle, the clamping seat is arranged on the connecting part, one end of the movable buckle is rotationally connected with the clamping seat, and the other end is clamped with the clamping seat. The clamping seat and the movable buckle have a positioning space, and the sleeve is located in the positioning space.

10. A screen printing apparatus characterized by comprising: The screen printing device comprises the squeegee mechanism, the horizontal movement driving mechanism and the screen plate according to any one of claims 1-9. The squeegee mechanism is arranged above the screen plate, and the printing material flows to the screen plate through the discharge port; The horizontal movement driving mechanism is drivingly connected with the mounting frame, and is used for driving the squeegee mechanism to horizontally move to squeegee the printing material on the screen plate.

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