Scraper mechanism, scraper printing equipment and automatic pressure detection, compensation and adjustment method during printing of scraper printing equipment

Abstract

The invention discloses a scraper mechanism, scraper printing equipment and a method for automatically detecting, compensating and adjusting pressure during printing, which are used for solving the problems that when the existing scraper printing equipment is used for printing a printing steel mesh with a concave-convex surface structure, a large amount of solder paste, soldering flux and other materials are remained on the printing steel mesh due to different blade coating pressure of the scraper mechanism, and the printing quality is influenced. And the printing effect is not good. The scraper mechanism comprises a control system, a rack, a pressure detection assembly, a lifting driving assembly, a connecting plate and a scraper body. The lifting driving assembly is mounted on the rack, and the lifting driving assembly is connected with the connecting plate through the pressure detection assembly; wherein the pressure detection assembly comprises a pressure sensor, one end of the pressure sensor is connected with the connecting plate, and the other end of the pressure sensor is connected with the scraper body; the pressure sensor and the lifting driving assembly are both electrically connected with the control system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tin paste printing, in particular to a doctor blade mechanism, a doctor blade printing device and a pressure automatic detection compensation adjustment method during printing. BACKGROUND

[0002] In the surface mounted technology (SMT) of electronic products, tin paste of uniform thickness needs to be scraped on the corresponding position of the PCB where the device is mounted, so as to ensure that the thickness of the tin paste meets the requirements of the subsequent reflow soldering process.

[0003] In the prior art, the doctor blade body in the doctor blade printing device pushes the tin paste to roll forward on the printing steel mesh to realize printing. With the complication of the structure of the PCB, there are concave and convex surfaces and other three-dimensional structures in some PCBs that need to be printed, which leads to the design of the concave and convex surfaces and other three-dimensional structures of the printing steel mesh.

[0004] When the doctor blade mechanism in the doctor blade printing device prints the printing steel mesh of this type, there is a height difference between the concave and convex surfaces of the printing steel mesh, and there is also a connecting slope between the concave and convex surfaces and the steel mesh body, which leads to different contact pressures of the doctor blade body of the doctor blade mechanism with the concave and convex surfaces and the connecting slope, and further leads to the residual of some tin paste, flux and other materials on the printing steel mesh. This situation not only leads to the insufficient use of tin paste, flux and other materials, but also affects the printing effect of the PCB. Some positions of the PCB may have insufficient tin paste, leading to virtual welding and other problems in the later period.

[0005] Therefore, it has become an important task for those skilled in the art to find a technical solution that can solve the above technical problems. SUMMARY

[0006] The present application discloses a doctor blade mechanism, a doctor blade printing device and a pressure automatic detection compensation adjustment method during printing, which is used to solve the technical problem that a large amount of tin paste, flux and other materials are left on the printing steel mesh due to different scraping pressures of the doctor blade mechanism when the existing doctor blade printing device prints the printing steel mesh with concave and convex surfaces, which further leads to poor printing effect.

[0007] The doctor blade mechanism provided by the present application comprises a control system, a rack, a pressure detection assembly, a lifting driving assembly, a connecting plate and a doctor blade body.

[0008] The lifting driving assembly is installed on the rack and connected with the connecting plate through the pressure detection assembly.

[0009] The pressure detection assembly comprises a pressure sensor, one end of the pressure sensor is connected with the connecting plate, and the other end is connected with the scraper body.

[0010] The pressure sensor and the lifting driving assembly are electrically connected with the control system.

[0011] Optionally, the pressure detection assembly comprises a lifting block, a movable sleeve, an elastic member and the pressure sensor.

[0012] The lifting driving assembly is connected with the lifting block, and is used to drive the lifting block to lift along the vertical direction; the movable sleeve is movably sleeved on the periphery of the lifting block and is driven to lift along the vertical direction relative to the lifting block; the bottom of the lifting block is connected with the inner bottom wall of the movable sleeve through the elastic member; and the outer bottom of the movable sleeve is connected with the connecting plate.

[0013] Optionally, the inside of the movable sleeve has a first movable cavity and a second movable cavity which are sequentially communicated along the vertical direction.

[0014] The lifting block comprises a main body part and a limiting part which is arranged on the top of the main body part and extends outward; the limiting part is movably arranged in the first movable cavity and can lift relative to the first movable cavity; the main body part is movably arranged in the second movable cavity and can lift relative to the second movable cavity; and the limiting part abuts against the inner top wall of the first movable cavity.

[0015] The bottom of the main body part is connected with the inner bottom wall of the second movable cavity through the elastic member.

[0016] Optionally, the bottom of the main body part is provided with a first supporting plate, and the inner bottom wall of the second movable cavity is provided with a second supporting plate; the first supporting plate and the second supporting plate are connected through the elastic member; the elastic member extends along the vertical direction, and the elastic member tends to drive the movable sleeve to move downward relative to the lifting block along the vertical direction.

[0017] Optionally, the elastic member is a spring.

[0018] Optionally, the pressure detection assembly comprises a lifting block, a fixed seat, a gas cylinder and the pressure sensor.

[0019] The lifting driving assembly is connected with the lifting block, and is used to drive the lifting block to lift along the vertical direction; the fixed seat is fixed to the lifting block, and the bottom of the fixed seat is connected with the gas cylinder; the gas cylinder is electrically connected with the control system; and the driving rod of the gas cylinder is connected with the connecting plate.

[0020] Optionally, the lifting driving assembly comprises a motor and a screw rod.

[0021] The motor is mounted on the frame and its output end is connected with the screw rod, the screw rod extends in the vertical direction and is threadedly connected with the lifting block, and the motor is used for driving the screw rod to rotate to drive the lifting block to lift along the screw rod.

[0022] Optionally, a guide assembly is further arranged between the connecting plate and the frame.

[0023] The guide assembly comprises a guide rod and a guide sleeve.

[0024] The guide rod is connected with the connecting plate, the guide sleeve is connected with the frame, and the guide rod is slidingly connected with the guide sleeve.

[0025] Alternatively, the guide rod is connected with the frame, the guide sleeve is connected with the connecting plate, and the guide rod is slidingly connected with the guide sleeve.

[0026] The present application provides a doctor blade printing device, comprising a doctor blade printing device, characterized by comprising a printing steel mesh, a mesh frame assembly for placing the printing steel mesh, and the above-mentioned doctor blade mechanism.

[0027] The printing steel mesh comprises a steel mesh body, and the steel mesh body is provided with a downwardly recessed concave surface and / or an upwardly protruding convex surface, wherein an abutting inclined surface is formed between the concave surface and / or the convex surface and the steel mesh body.

[0028] The present application provides a pressure automatic detection compensation adjustment method for a doctor blade printing device during printing, which is based on the above-mentioned doctor blade printing device, and the method comprises the following steps:

[0029] S1, placing the printing steel mesh on the mesh frame assembly, and setting a preset pressure value of the doctor blade mechanism during printing on the control system;

[0030] S2, the doctor blade mechanism moves to the starting point of the printing steel mesh, and the control system controls the doctor blade body to repeatedly abut against the printing steel mesh multiple times, so as to search for the preset pressure value, the pressure sensor detects the pressure value when the doctor blade body contacts the printing steel mesh in real time, and when the detected pressure value is the same as the preset pressure value, the searching of the preset pressure value is completed, and the doctor blade mechanism starts to be driven to reciprocally move on the printing steel mesh to perform the printing process;

[0031] S3. During the printing process, the scraper body abuts against the connecting bevel, convex surface and / or concave surface of the printing steel mesh, and the pressure sensor detects the pressure value of the scraper body abutting against the connecting bevel, convex surface and / or concave surface in real time and feeds back to the control system. When the detected pressure value is less than the preset pressure value, the control system increases the abutting pressure between the scraper body and the printing steel mesh until the detected pressure value is equal to the preset pressure value. When the detected pressure value is greater than the preset pressure value, the control system reduces the abutting pressure between the scraper body and the printing steel mesh until the detected pressure value is equal to the preset pressure value.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] In the scraper mechanism of the present invention, the lifting drive assembly drives the connecting plate and the scraper body to rise and fall in the vertical direction through the pressure detection assembly. When the scraper body is driven down to abut against the surface of the printing steel mesh, the pressure sensor can detect the pressure value when the scraper body abuts against the printing steel mesh, and then feed it back to the control system. The control system compares the detected pressure value with the preset pressure value to control the pressure value when the scraper body abuts against the printing steel mesh, thereby effectively ensuring that the preset pressure value can be maintained when the scraper body abuts against the convex surface, connecting slope and / or concave surface of the printing steel mesh.

[0034] In the above design, by setting a pressure sensor in the scraper mechanism, the pressure value of the scraper body during the printing process can be adjusted in real time, which can avoid as much as possible the solder paste, flux and other materials on the concave surface, convex surface or connecting slope of the printing steel mesh from remaining on the printing steel mesh, effectively improving the utilization rate of solder paste, flux and other materials. At the same time, according to the pressure sensor, the control system can control the pressure of the scraper body during the printing process to maintain it at a preset pressure value, which is beneficial to improving the printing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 A schematic structural diagram of a first specific embodiment of a scraper mechanism provided by the present invention;

[0037] Figure 2 A schematic structural diagram of a first embodiment of a scraper mechanism provided by the present invention with some parts hidden;

[0038] Figure 3A structure sectional view in a first specific embodiment of a doctor blade mechanism provided by the present application;

[0039] Figure 4 A structure schematic view of a second specific embodiment of a doctor blade mechanism provided by the present application;

[0040] Figure 5 A structure schematic view of a doctor blade mechanism provided by the present application when printing on a printing screen with a concave surface;

[0041] Figure 6 A structure schematic view of a doctor blade mechanism provided by the present application when printing on a printing screen with a convex surface;

[0042] Figure 7 A flowchart of a pressure automatic detection compensation adjustment method of a doctor blade printing device provided by the present application when printing;

[0043] Illustration: printing screen 1; screen body 101; concave surface 102; convex surface 103, connecting inclined surface 104; frame 2; lifting driving assembly 3; motor 301; lead screw 302; movable sleeve 4; first movable cavity 401; second movable cavity 402; doctor blade body 5; connecting plate 6; pressure sensor 7; guide rod 8; guide sleeve 9; lifting block 10; limiting part 1001; main body part 1002; elastic member 11; first support plate 12; second support plate 13; fixed seat 14; air cylinder 15. DETAILED DESCRIPTION

[0044] The present application discloses a doctor blade mechanism, a doctor blade printing device and a pressure automatic detection compensation adjustment method thereof when printing, which is used to solve the technical problem that a large amount of tin paste, soldering flux and other materials are left on a printing screen due to different doctor blade coating pressures when a doctor blade printing device prints a printing screen with a concave-convex surface structure, thereby causing poor printing effect.

[0045] In order for those skilled in the art to better understand the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0046] Please refer to Figures 1 to 6 The doctor blade mechanism provided by the present application embodiment comprises a control system, a frame 2, a pressure detection assembly, a lifting driving assembly 3, a connecting plate 6 and a doctor blade body 5.

[0047] The lifting driving assembly is installed on the rack 2, and the lifting driving assembly 3 is connected with the connecting plate 6 through the pressure detection assembly.

[0048] The pressure detection assembly comprises a pressure sensor 7, one end of the pressure sensor 7 is connected with the connecting plate 6, and the other end is connected with the scraper body 5.

[0049] The pressure sensor 7 and the lifting driving assembly 3 are electrically connected with the control system.

[0050] In the scraper mechanism, the lifting driving assembly 3 drives the connecting plate 6 and the scraper body 5 to lift in the vertical direction through the pressure detection assembly, when the scraper body 5 is driven to descend to abut against the surface of the printing steel mesh 1, the pressure sensor 7 can detect the pressure value when the scraper body 5 abuts against the printing steel mesh 1, and then feedback to the control system, the control system compares the detected pressure value with the preset pressure value to control the pressure value when the scraper body 5 abuts against the printing steel mesh 1, and then effectively ensures that the scraper body 5 can maintain the preset pressure value when abutting against the convex surface 103, the connecting inclined surface 104 and / or the concave surface 102 of the printing steel mesh 1.

[0051] In the above design, by arranging the pressure sensor 7 in the scraper mechanism, the pressure value of the scraper body 5 in the printing process can be adjusted in real time, the tin paste, soldering flux and other materials on the printing steel mesh 1 can be avoided as much as possible, the use rate of the tin paste, soldering flux and other materials is effectively improved, and the printing effect is improved.

[0052] Further, in the first specific embodiment, the pressure detection assembly in the embodiment comprises a lifting block 10, a movable sleeve 4, an elastic member 11 and the pressure sensor 7.

[0053] The lifting driving assembly 3 is connected with the lifting block 10, the lifting driving assembly 3 is used for driving the lifting block 10 to lift in the vertical direction, the movable sleeve 4 is movably sleeved on the periphery of the lifting block 10 and can be driven to lift in the vertical direction relative to the lifting block 10, the bottom of the lifting block 10 is connected with the inner bottom wall of the movable sleeve 4 through the elastic member 11, and the outer bottom of the movable sleeve 4 is connected with the connecting plate 6.

[0054] It should be noted that through the above design, the lifting driving assembly 3 drives the lifting block 10 to move in the vertical direction, and at the same time, the movable sleeve 4 also moves in the vertical direction with the lifting block 10, when the lifting block 10 descends to the preset position, the scraper body 5 abuts against the printing steel mesh 1 to start the printing process, wherein when the scraper body 5 abuts against the printing steel mesh 1, the connecting plate 6, the scraper body 5 and the movable sleeve 4 all move upward in the vertical direction relative to the lifting block 10 due to the reaction force of the printing steel mesh 1, so that the movable sleeve 4 compresses the elastic element 11, and at the same time, the connecting plate 6 is also subjected to the reaction force of the elastic element 11, at this time, the pressure sensor 7 can detect the pressure value when the scraper body 5 abuts against the printing steel mesh 1, and then feedback to the control system, the control system compares the real-time pressure value with the preset pressure value to control the lifting driving assembly 3 to drive the lifting block 10 to lift, so as to adjust the pressure value when the scraper body 5 abuts against the printing steel mesh 1, and then effectively ensure that the scraper body 5 abuts against the concave surface 102 and / or the convex surface 103 and the connecting inclined surface 104 of the printing steel mesh 1 can all maintain the preset pressure value.

[0055] Further, in the above specific embodiment, the movable sleeve 4 has a first movable cavity 401 and a second movable cavity 402 which are sequentially communicated in the vertical direction inside the movable sleeve 4;

[0056] The lifting block 10 comprises a main body part 1002 and a limiting part 1001 which is arranged on the top of the main body part 1002 and extends outward, the limiting part 1001 is movably arranged in the first movable cavity 401 and can lift relative to the first movable cavity 401, the main body part 1002 is movably arranged in the second movable cavity 402 and can lift relative to the second movable cavity 402, and the limiting part 1001 abuts against the inner top wall of the first movable cavity 401;

[0057] The bottom of the main body part 1002 is connected with the inner bottom wall of the second movable cavity 402 through the elastic element 11.

[0058] It should be noted that during the lifting of the lifting driving assembly 3 driving the lifting block 10 in the vertical direction, the limiting part 1001 abuts against the inner top wall of the first movable cavity 401 to lift synchronously with the lifting block 10, when the scraper body 5 abuts against the printing steel mesh 1, the scraper body 5, the connecting plate 6 and the movable sleeve 4 all rise synchronously relative to the lifting block 10 due to the reaction force of the printing steel mesh 1, at this time, the first movable cavity 401 rises relative to the limiting part 1001, and the second movable cavity 402 rises relative to the main body part 1002, so as to compress the spring, and then the pressure sensor 7 obtains the real-time pressure value by the reaction force of the elastic element 11.

[0059] Further, in the above specific embodiment, the bottom of the main body 1002 is provided with a first support plate 12, and the inner bottom wall of the second movable cavity 402 is provided with a second support plate 13, wherein the first support plate 12 and the second support plate 13 are connected by the elastic piece 11, the elastic piece 11 extends in the vertical direction and tends to drive the movable sleeve 4 to move downward relative to the lifting block 10 in the vertical direction.

[0060] It should be noted that the elastic piece 11 is specifically a spring, which specifically extends in the vertical direction, and the top end of the spring is connected with the first support plate 12, and the bottom end of the spring is connected with the second support plate 13.

[0061] Further, in the second specific embodiment, the pressure detection assembly in the embodiment includes a lifting block 10, a fixed seat 14, a gas cylinder 15, and the pressure sensor 7;

[0062] The lifting driving assembly 3 is connected with the lifting block 10, and the lifting driving assembly 3 is used to drive the lifting block 10 to lift in the vertical direction, the fixed seat 14 is fixed to the lifting block 10 and the bottom of the fixed seat 14 is connected with the gas cylinder 15, the gas cylinder 15 is electrically connected with the control system, and the driving rod of the gas cylinder 15 is connected with the connecting plate 6.

[0063] It should be noted that through the above design, the lifting driving assembly 3 drives the lifting block 10 to move in the vertical direction, and at the same time, the fixed seat 14, the gas cylinder 15, the connecting plate 6, and the scraper body 5 will also move in the vertical direction with the lifting block 10, when the lifting block 10 descends to the preset position, the scraper body 5 abuts against the printing steel mesh 1 to start the printing process, wherein when the scraper body 5 abuts against the printing steel mesh 1, the connecting plate 6 will press against the driving rod of the gas cylinder 15 due to the reaction force of the printing steel mesh 1, and at the same time, the connecting plate 6 will be driven by the driving force of the driving rod of the gas cylinder 15, at this time, the pressure sensor 7 can detect the pressure value when the scraper body 5 abuts against the printing steel mesh 1, so as to feedback to the control system, the control system compares the real-time pressure value with the preset pressure value to control the gas pressure in the gas cylinder 15 to increase or decrease, so as to fine-tune the pressure value when the scraper body 5 abuts against the printing steel mesh 1 through the extension and retraction action of the driving rod, since the stroke of the driving rod of the gas cylinder 15 is limited, it can only realize the function of fine-tuning the pressure, when the amplitude of the pressure needs to be adjusted, at this time, the lifting driving assembly 3 needs to be controlled by the control system to drive the lifting block 10 to lift, so as to adjust the pressure value when the scraper body 5 abuts against the printing steel mesh 1, and effectively ensure that the concave surface 102 and / or the convex surface 103 and the connecting inclined surface 104 of the scraper body 5 and the printing steel mesh 1 can maintain the preset pressure value when abutting against each other.

[0064] In addition, it should be noted that the air cylinder 15 is connected with an air pressure regulator, which is electrically connected with the control system, so that the control system can adjust the air pressure in the air cylinder 15 according to the real-time detected pressure value, thereby controlling the extension and retraction action of the driving rod, and further fine-tuning the abutting pressure of the scraper body 5 and the printing steel mesh 1.

[0065] Further, the lifting driving assembly 3 in the embodiment comprises a motor 301 and a lead screw 302.

[0066] The motor 301 is mounted on the rack 2 and its output end is connected with the lead screw 302, the lead screw 302 extends in the vertical direction and is threadedly connected with the lifting block 10, and the motor 301 is used to drive the lead screw 302 to rotate to drive the lifting block 10 to ascend and descend along the lead screw 302.

[0067] It should be noted that, for the convenience of control, the above-mentioned motor 301 is specifically a servo motor 301, which is electrically connected with the control system to realize the functions of forward rotation, reverse rotation and speed change of the motor 301, and in addition, in order to realize the threaded connection between the lifting block 10 and the lead screw 302, a threaded hole is formed in the interior of the lifting block 10, and the lead screw 302 is threadedly connected with the threaded hole, and by driving the lead screw 302 to rotate by the motor 301, the lifting of the lifting block 10 in the vertical direction can be realized.

[0068] Further, the connecting plate 6 in the embodiment is further provided with a guide assembly between the rack 2;

[0069] The guide assembly comprises a guide rod 8 and a guide sleeve 9.

[0070] The guide rod 8 is connected to the connecting plate 6, the guide sleeve 9 is connected to the rack 2, and the guide rod 8 is slidingly connected to the guide sleeve 9.

[0071] Alternatively, the guide rod 8 is connected to the rack 2, the guide sleeve 9 is connected to the connecting plate 6, and the guide rod 8 is slidingly connected to the guide sleeve 9.

[0072] It should be noted that, through the above design, when the scraper body 5 is driven to ascend and descend, the guide rod 8 can slide in the vertical direction relative to the guide sleeve 9, thereby improving the stability of the scraper body 5 during the lifting process.

[0073] Please refer to Figures 1 to 6 The scraper printing device provided by the embodiment of the present application comprises a printing steel mesh 1, a mesh frame assembly for placing the printing steel mesh 1, and the above-mentioned scraper mechanism.

[0074] The printing steel mesh 1 comprises a steel mesh body 101, and a concave surface 102 and / or a convex surface 103 are arranged on the steel mesh body 101, wherein the concave surface 102 and / or the convex surface 103 and the steel mesh body 101 form an abutting inclined surface 104.

[0075] It should be noted that in the printing steel mesh 1, the number of the concave surface 102 and the convex surface 103 is not specifically limited in the embodiment; the inclination angle between the abutting inclined surface 104 and the steel mesh body 101 is less than 45°, and the depth of the concave surface 102 relative to the steel mesh body 101 is not limited, and the height of the convex surface 103 relative to the steel mesh body 101 is not limited.

[0076] In the printing device, the printing steel mesh 114 is fixed on the screen frame assembly, and then the doctor blade mechanism is driven to reciprocate on the surface of the printing steel mesh 1 by a driving mechanism similar to a linear module to complete the printing work.

[0077] In the doctor blade mechanism of the doctor blade printing device, the lifting driving assembly 3 drives the connecting plate 6 and the doctor blade body 5 to lift in the vertical direction, and when the doctor blade body 5 is driven to abut on the surface of the printing steel mesh 1, the pressure sensor 7 can detect the pressure value when the doctor blade body 5 abuts on the printing steel mesh 1, and then the pressure value is fed back to the control system, the control system compares the detected pressure value with the preset pressure value to control the pressure value when the doctor blade body 5 abuts on the printing steel mesh 1, and thus the preset pressure value can be maintained when the doctor blade body 5 abuts on the convex surface 103, the abutting inclined surface 104 and / or the concave surface 102 of the printing steel mesh 1.

[0078] In the above design, by arranging the pressure sensor 7 in the doctor blade mechanism, the pressure value of the doctor blade body 5 during printing can be adjusted in real time, the materials such as solder paste and flux on the concave surface 102, the convex surface 103 and / or the abutting inclined surface 104 of the printing steel mesh 1 can be avoided as much as possible, the use rate of the materials such as solder paste and flux is effectively improved, and the printing effect is improved due to the control of the control system on the pressure of the doctor blade body 5 during printing.

[0079] Please refer to Figures 1 to 7 The pressure automatic detection compensation adjustment method for the doctor blade printing device provided by the embodiment of the application is based on the above doctor blade printing device, and comprises the following steps:

[0080] S1, placing the printing steel mesh 1 on the screen frame assembly, and setting the preset pressure value of the doctor blade mechanism during printing on the control system;

[0081] S2, the squeegee mechanism moves to the starting point of the printing steel mesh 1, the control system controls the squeegee body 5 to repeatedly abut against the printing steel mesh 1 multiple times to search for a preset pressure value, the pressure sensor 7 detects the pressure value when the squeegee body 5 contacts the printing steel mesh 1 in real time, when the detected pressure value is equal to the preset pressure value, the search for the preset pressure value ends, and the squeegee mechanism starts to be driven to reciprocate on the printing steel mesh 1 to perform a printing process;

[0082] S3, in the printing process, the squeegee body 5 abuts against the abutment inclined surface 104, the convex surface 103 and / or the concave surface 102 of the printing steel mesh 1, the pressure sensor 7 detects the pressure value when the squeegee body 5 abuts against the abutment inclined surface 104, the convex surface 103 and / or the concave surface 102 respectively and feeds back to the control system, when the detected pressure value is less than the preset pressure value, the control system increases the abutment pressure of the squeegee body and the printing steel mesh 1 until the detected pressure value is equal to the preset pressure value, and when the detected pressure value is greater than the preset pressure value, the control system reduces the abutment pressure of the squeegee body and the printing steel mesh 1 until the detected pressure value is equal to the preset pressure value.

[0083] It should be noted that, since the pressure detection assembly in the embodiment has two different structures, when the pressure detection assembly is in the structure of the first specific embodiment, the above step S3 specifically includes:

[0084] In the printing process, the squeegee body 5 abuts against the abutment inclined surface 104, the convex surface 103 and / or the concave surface 102 of the printing steel mesh 1, the pressure sensor 7 detects the pressure value when the squeegee body 5 abuts against the abutment inclined surface 104, the convex surface 103 and / or the concave surface 102 respectively and feeds back to the control system, when the detected pressure value is less than the preset pressure value, the control system controls the lifting driving assembly 3 to drive the lifting block 10 to descend to increase the abutment pressure of the squeegee body and the printing steel mesh 1 until the detected pressure value is equal to the preset pressure value, and when the detected pressure value is greater than the preset pressure value, the control system controls the lifting driving assembly 3 to drive the lifting block 10 to ascend to reduce the abutment pressure of the squeegee body and the printing steel mesh 1 until the detected pressure value is equal to the preset pressure value.

[0085] When the pressure detection assembly is in the structure of the second specific embodiment, the above step S3 specifically includes:

[0086] In the printing process, the scraper body 5 abuts against the abutment bevel 104, the convex surface 103 and / or the concave surface 102 of the printing steel mesh 1, the pressure sensor 7 detects the pressure value when the scraper body 5 abuts against the abutment bevel 104, the convex surface 103 and / or the concave surface 102 respectively in real time and feeds back to the control system;

[0087] When the detected pressure value is less than the preset pressure value and the difference between them is less than the standard deviation, the control system controls the air pressure in the air cylinder 15 to rise to make the driving rod extend, thereby increasing the abutment pressure of the scraper body and the printing steel mesh 1 until the detected pressure value is equal to the preset pressure value; when the detected pressure value is less than the preset pressure value and the difference between them is greater than the standard deviation, the control system controls the air pressure in the air cylinder 15 to rise to make the driving rod extend, and at the same time, the control system controls the lifting driving assembly 3 to drive the lifting block 10 to descend, thereby increasing the abutment pressure of the scraper body and the printing steel mesh 1 until the detected pressure value is equal to the preset pressure value.

[0088] When the detected pressure value is greater than the preset pressure value and the difference between them is less than the standard deviation, the control system controls the air pressure in the air cylinder 15 to drop to make the driving rod retract, thereby reducing the abutment pressure of the scraper body and the printing steel mesh 1 until the detected pressure value is equal to the preset pressure value; when the detected pressure value is greater than the preset pressure value and the difference between them is greater than the standard deviation, the control system controls the air pressure in the air cylinder 15 to rise to make the driving rod extend, and at the same time, the control system controls the lifting driving assembly 3 to drive the lifting block 10 to ascend, thereby reducing the abutment pressure of the scraper body and the printing steel mesh 1 until the detected pressure value is equal to the preset pressure value.

[0089] The standard deviation is a man-made value, and the embodiment does not limit it.

[0090] It should be noted that in the above-mentioned pressure automatic detection compensation adjustment method, by adjusting the pressure value of the scraper body 5 in the printing process in real time, it is possible to avoid the tin paste, soldering flux and other materials on the abutment bevel 104, the convex surface 103 and / or the concave surface 102 of the printing steel mesh 1 as much as possible, effectively improve the use rate of tin paste, soldering flux and other materials, and at the same time, since the control system can control the pressure of the scraper body 5 in the printing process to be kept at the preset pressure value according to the pressure sensor 7, it is beneficial to improve the printing effect.

[0091] The above describes in detail the scraper mechanism, the scraper printing equipment and the pressure automatic detection compensation adjustment method thereof in the printing process provided by the application. For those skilled in the art, according to the idea of the embodiment of the application, the specific implementation and application range can be changed. In view of the above, the content of the specification should not be understood as a limitation of the application.

Claims

1. A scraper mechanism, characterized in that: It comprises a control system, a frame (2), a pressure detection component, a lifting drive component (3), a connecting plate (6) and a scraper body (5); The lifting drive group is mounted on the frame (2) and the lifting drive assembly (3) is connected to the connecting plate (6) via the pressure detection assembly; The pressure detection assembly comprises a pressure sensor (7), one end of the pressure sensor (7) is connected to the connecting plate (6), and the other end is connected to the scraper body (5); The pressure sensor (7) and the lifting drive assembly (3) are both electrically connected to the control system.

2. The scraper mechanism according to claim 1, characterized in that: The pressure detection assembly comprises a lifting block (10), a movable sleeve (4), an elastic member (11), and the pressure sensor (7); The lifting drive assembly (3) is connected to the lifting block (10), and the lifting drive assembly (3) is used to drive the lifting block (10) to lift in a vertical direction. The movable sleeve (4) is movably sleeved on the periphery of the lifting block (10) and can be driven to lift in a vertical direction relative to the lifting block (10). The bottom of the lifting block (10) is connected to the inner bottom wall of the movable sleeve (4) through the elastic member (11), and the outer bottom of the movable sleeve (4) is connected to the connecting plate (6).

3. The scraper mechanism according to claim 2, characterized in that: The interior of the movable sleeve (4) comprises a first movable cavity (401) and a second movable cavity (402) which are connected in sequence along the vertical direction; The lifting block (10) includes a main body (1002) and a limiting portion (1001) arranged on the top of the main body (1002) and extending outward, the limiting portion (1001) is movably arranged in the first movable cavity (401) and can be lifted and lowered relative to the first movable cavity (401), the main body (1002) is movably arranged in the second movable cavity (402) and can be lifted and lowered relative to the second movable cavity (402), and the limiting portion (1001) abuts against the inner top wall of the first movable cavity (401); The bottom of the main body (1002) is connected to the inner bottom wall of the second movable cavity (402) via the elastic member (11).

4. The scraper mechanism according to claim 3, characterized in that: A first support plate (12) is provided at the bottom of the main body (1002), and a second support plate (13) is provided on the inner bottom wall of the second movable cavity (402), wherein the first support plate (12) and the second support plate (13) are connected via the elastic member (11), and the elastic member (11) extends in a vertical direction and tends to drive the movable sleeve (4) to move downward in a vertical direction relative to the lifting block (10).

5. The scraper mechanism according to claim 2, characterized in that: The elastic member (11) is a spring.

6. The scraper mechanism according to claim 1, characterized in that: The pressure detection assembly comprises a lifting block (10), a fixing seat (14), a cylinder (15), and the pressure sensor (7); The lifting drive assembly (3) is connected to the lifting block (10), and the lifting drive assembly (3) is used to drive the lifting block (10) to lift in a vertical direction. The fixing seat (14) is fixed to the lifting block (10) and its bottom is connected to the cylinder (15). The cylinder (15) is electrically connected to the control system, and the driving rod of the cylinder (15) is connected to the connecting plate (6).

7. The scraper mechanism according to claim 2 or 6, characterized in that: The lifting drive assembly (3) includes a motor (301) and a lead screw (302); The motor (301) is mounted on the frame (2) and its output end is connected to the lead screw (302). The lead screw (302) extends in a vertical direction and is threadedly connected to the lifting block (10). The motor (301) is used to drive the lead screw (302) to rotate so as to drive the lifting block (10) to move up and down along the lead screw (302).

8. The scraper mechanism according to claim 1, characterized in that: A guide assembly is also provided between the connecting plate (6) and the frame (2); The guide assembly comprises a guide rod (8) and a guide sleeve (9); The guide rod (8) is connected to the connecting plate (6), the guide sleeve (9) is connected to the frame (2), and the guide rod (8) is slidably connected to the guide sleeve (9); Alternatively, the guide rod (8) is connected to the frame (2), the guide sleeve (9) is connected to the connecting plate (6), and the guide rod (8) is slidably connected to the guide sleeve (9).

9. A scraper printing device, characterized in that: Comprising a printing steel screen (1), a screen frame assembly for placing the printing steel screen (1), and a scraper mechanism according to any one of claims 1 to 8; The printing steel mesh (1) comprises a steel mesh body (101), wherein a concave surface (102) that is recessed downward and / or a convex surface (103) that is protruding upward is provided on the steel mesh body (101), wherein a connecting inclined surface (104) is formed between the concave surface (102) and / or the convex surface (103) and the steel mesh body (101).

10. A method for automatically detecting, compensating and adjusting the pressure during printing by a scraper printing device, based on the scraper printing device according to claim 9, the method comprising the following steps: S1, placing the printing steel screen (1) on the screen frame assembly, and setting a preset pressure value of the scraper mechanism during printing on the control system; S2, the scraper mechanism moves to the starting point of the printing steel mesh (1), the control system controls the scraper body (5) to repeatedly abut against the printing steel mesh (1) multiple times, thereby searching for a preset pressure value, the pressure sensor (7) detects in real time the pressure value when the scraper body (5) contacts the printing steel mesh (1), and when the detected pressure value is the same as the preset pressure value, the search for the preset pressure value is completed, and the scraper mechanism starts to be driven to move back and forth on the printing steel mesh (1) to perform the printing process; S3. During the printing process, the scraper body (5) abuts against the connecting bevel (104), convex surface (103) and / or concave surface (102) of the printing steel mesh (1), and the pressure sensor (7) detects in real time the pressure value of the scraper body (5) abutting against the connecting bevel (104), convex surface (103) and / or concave surface (102) and feeds back to the control system. When the detected pressure value is less than the preset pressure value, the control system increases the abutting pressure between the scraper body and the printing steel mesh (1) until the detected pressure value is equal to the preset pressure value. When the detected pressure value is greater than the preset pressure value, the control system reduces the abutting pressure between the scraper body and the printing steel mesh (1) until the detected pressure value is equal to the preset pressure value.

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