An automatically positioned circuit board solder paste printing apparatus

Abstract

The application relates to the field of circuit board production, in particular to a circuit board tin paste printing device with automatic positioning, which comprises a tin paste printing machine, a conveying pull line and a protective door and the like; the tin paste printing machine is internally provided with the conveying pull line; and the tin paste printing machine is movably connected with the protective door. After the positioning assembly is used to upwardly lift the supporting plate and the circuit board by the first electric push rod, the circuit board is clamped and positioned, thereby solving the problem that in the prior art, after the circuit board is first corrected and positioned, when the supporting plate and the corrected circuit board are driven by the first electric push rod to move upward, the circuit board is prone to shaking and deviation, the subsequent tin paste printing is deviated, and the printing quality is affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circuit board production, and particularly relates to a circuit board tin paste printing device with automatic positioning. BACKGROUND

[0002] Tin paste printing is one of the key processes in surface mount technology (SMT), which is used to accurately deposit tin paste on a circuit board for subsequent component mounting and welding.

[0003] The existing tin paste printing is to first intercept and correct the positioning of the circuit board after the circuit board is conveyed to the designated position by the conveying belt, then push the circuit board upward by the electric push rod to make the circuit board contact with the lower surface of the steel mesh, and then control the scraper to perform the printing operation. However, in the process of pushing the circuit board upward by the electric push rod, the circuit board is prone to shaking, and the tin paste printing point of the circuit board is small, so slight shaking will cause a large deviation of the printing position of the circuit board.

[0004] Further, in order to ensure that the steel mesh is clean and dust-free and to ensure the quality of tin paste printing, the steel mesh needs to be cleaned immediately after each printing is completed by an additional cleaning mechanism to prevent tin paste from drying and affecting the quality of the next printing. However, during the printing process, the conveying belt is continuously conveying, which causes the cleaning mechanism to not be cleaned when the next circuit board is already conveyed in place, thereby reducing the production efficiency. SUMMARY

[0005] In order to overcome the problem that the circuit board is prone to shaking in the process of pushing the corrected circuit board upward by the electric push rod, which causes a deviation of the printing position and affects the printing effect, the present application provides a circuit board tin paste printing device with automatic positioning.

[0006] The technical implementation scheme of the application is: an automatic positioning circuit board tin paste printing device, comprising a tin paste printing machine, a conveying pull wire and a protective door; the tin paste printing machine is provided with the conveying pull wire; the tin paste printing machine is movably connected with the protective door; further comprising a printing assembly, a second electric push rod, a sliding plate, a tension pulley, a pull rope, a fixed block, a straight light axis, a limiting block, a sliding block, a first spring, a wiping roller and a clamping block; the tin paste printing machine is connected with the printing assembly for tin paste printing of the circuit board; the tin paste printing machine is fixedly connected with the second electric push rod; the output end of the second electric push rod is fixedly connected with the sliding plate; the sliding plate, the conveying pull wire and the printing assembly are all connected with the tension pulley; the printing assembly is connected with two front and rear symmetrical fixed blocks; the two fixed blocks are fixedly connected with two left and right symmetrical straight light axes; the two straight light axes are slidably connected with the sliding block for clamping and positioning of the circuit board in the front and rear directions; the printing assembly and the sliding block are connected with the pull rope, which is in a C shape under the limitation of the three tension pulleys; a plurality of first springs are fixedly connected between the sliding block and the front fixed block; the rear side of the sliding block is fixedly connected with two left and right symmetrical clamping blocks for clamping and positioning of the circuit board in the left and right directions; the lower rear part of the steel mesh is fixedly connected with the limiting block; the sliding block is rotatably connected with the wiping roller for wiping the steel mesh.

[0007] More preferably, the printing assembly comprises an electric guide rail, a controller, a printer, a fixed plate, a steel mesh, a first electric push rod, a supporting plate and a visual sensor; the tin paste printing machine is provided with the electric guide rail; the controller is slidably connected to the electric guide rail; the printer is slidably connected to the lower side of the controller; the tin paste printing machine is fixedly connected with the fixed plate; the upper side of the sliding plate, the front side of the conveying pull wire and the lower side of the fixed plate are fixedly connected with the corresponding tension pulleys; the fixed plate is fixedly connected with the fixed block; the inner side of the fixed plate is fixedly connected with the steel mesh; the printer is in contact with the upper surface of the steel mesh; a plurality of first electric push rods are fixedly connected in the tin paste printing machine, and the first electric push rods penetrate through the sliding plate; the extension ends of all the first electric push rods are fixedly connected with the supporting plate for abutting the circuit board against the lower side of the steel mesh; the supporting plate is located below the conveying pull wire, and the lower side of the supporting plate and the front side of the sliding block are fixedly connected with the pull rope; the tin paste printing machine is fixedly connected with the visual sensor.

[0008] More preferably, the front side of the clamping block is inclined.

[0009] More preferably, the straight light axis is a chromium-plated light axis.

[0010] More preferably, a groove is formed between the middle part of the fixed plate and the upper surface of the steel mesh.

[0011] More preferably, the middle part of the protective door is provided with an explosion-proof glass.

[0012] More preferably, further comprising a radiator; a plurality of radiators are fixedly connected to the rear side of the tin paste printing machine.

[0013] More preferably, the tin printing machine further comprises an air inlet pipe and a connecting pipe; the front side of the sliding block is provided with an air suction port, the rear side of the sliding block is provided with an air blowing port, the wiping roller is located between the air suction port and the air blowing port, and the tin printing machine is provided with an air pump; the sliding block and the air pump are communicated through the air inlet pipe; the air inlet pipe is communicated with the air suction port and the air blowing port through the connecting pipe; and the connecting pipe is provided with an electromagnetic valve at the connection with the air suction port and the air blowing port.

[0014] More preferably, the tin printing machine further comprises an air inlet cavity, a clamping plate and a second spring; the air inlet cavity is arranged in each clamping block; the air inlet cavity is communicated with the connecting pipe, and the air inlet cavity and the connecting pipe are provided with an electromagnetic valve; the clamping plate is slidably connected to the facing side of the two clamping blocks; the second spring is fixedly connected between the clamping plate and the clamping block; and the sliding end of each clamping plate penetrates through the corresponding clamping block and is located in the corresponding air inlet cavity.

[0015] More preferably, the tin printing machine further comprises a conductive sheet; the contact surface of each sliding block and the steel mesh is provided with a conductive sheet for removing static electricity on the surface of the steel mesh, and the conductive sheet is grounded.

[0016] The tin printing machine has the following beneficial effects: the circuit board is clamped and positioned after the positioning assembly lifts the supporting plate and the circuit board upward by the first electric push rod, thereby solving the problem that the circuit board is easily shaken and deviated when the supporting plate and the corrected circuit board are moved upward by the first electric push rod, which leads to deviation of subsequent tin printing and affects the printing quality.

[0017] Further, in the process of lifting the supporting plate and the circuit board upward by the first electric push rod, the upward movement of the supporting plate drives the sliding block to move forward, and the wiping roller on the upper side of the sliding block contacts the lower surface of the steel mesh, thereby wiping the lower surface of the steel mesh before printing the circuit board; when the first electric push rod and the second electric push rod are retracted, the sliding block moves backward to reset, thereby wiping the lower surface of the steel mesh after the printing of the circuit board is completed, and combining the cleaning action of the steel mesh with the resetting action of the first electric push rod and the second electric push rod, without additional cleaning process, which greatly improves the production efficiency.

[0018] In the process of moving the sliding block forward, the suction port generates suction force, thereby sucking and removing the dust and impurities on the lower surface of the steel mesh before printing; in the process of moving the sliding block backward to reset, the air blowing port blows upward, thereby blowing the tin paste in the steel mesh holes upward to the upper surface of the steel mesh, which is convenient for the tin paste to be sucked back for recycling by the tin paste suction device in the printer, thereby cleaning the residual tin paste in the steel mesh holes after printing.

[0019] The tin printing machine has the following beneficial effects:

[0020] The straight light axis is a chrome-plated light axis, has high assembly precision, low friction coefficient, reliable operation and long service life;

[0021] The recess is formed between the middle part of the fixing plate and the upper surface of the steel net, prevents tin paste on the surface of the steel net from flowing outward and diffusing, and causes waste;

[0022] The explosion-proof glass is arranged in the middle part of the protection door, and workers can observe the running state of the inside of the machine through the explosion-proof glass during the operation of the tin paste printing machine;

[0023] The radiator is arranged at the rear side of the tin paste printing machine, the heat generated during the operation of the tin paste printing machine is quickly dissipated through the radiator, the tin paste is prevented from solidifying due to the excessively high temperature in the tin paste printing machine, and the printing effect is affected. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a three-dimensional structure schematic view of the automatic positioning circuit board tin paste printing equipment of the application;

[0025] Figure 2 It is an internal structure schematic view of the tin paste printing machine of the application;

[0026] Figure 3 It is a three-dimensional structure schematic view of the combination of the first electric push rod, the supporting plate, the second electric push rod and the sliding plate of the application;

[0027] Figure 4 It is a three-dimensional structure schematic view of the combination of the second electric push rod, the sliding plate, the tensioning wheel, the pull rope, the fixing block, the straight light axis, the limiting block and the sliding block of the application;

[0028] Figure 5 It is a three-dimensional structure schematic view of the combination of the sliding block, the air inlet pipe, the connecting pipe and the clamping block of the application;

[0029] Figure 6 It is a three-dimensional structure schematic view of the combination of the clamping block, the clamping plate and the second spring of the application.

[0030] Wherein, the above figure includes the following reference signs: 1-solder paste printer, 2-conveying pull wire, 3-protection door, 3001-explosion-proof glass, 101-electric guide rail, 102-controller, 103-printer, 104-fixing plate, 10401-groove, 105-steel mesh, 106-first electric push rod, 107-supporting plate, 108-vision sensor, 109-radiator, 201-second electric push rod, 202-sliding plate, 203-tensioning wheel, 204-pull rope, 205-fixing block, 206-straight light axis, 207-limiting block, 208-sliding block, 20801-air suction port, 20802-air blowing port, 209-first spring, 301-wiping roller, 302-air inlet pipe, 303-connection pipe, 304-clamping block, 30401-air inlet cavity, 305-clamping plate, 306-second spring, 307-conductive sheet, 555-circuit board. DETAILED DESCRIPTION

[0031] The present application will be further described below in connection with specific embodiments, the illustrative embodiments of the present application and the description are used to explain the present application, but not as a limitation of the present application.

[0032] Example 1

[0033] An automatic positioning circuit board solder paste printing device, as shown in Figures 1-5 , comprising a solder paste printer 1, a conveying pull wire 2 and a protection door 3; the solder paste printer 1 is provided with the conveying pull wire 2; the solder paste printer 1 is hinged with the protection door 3;

[0034] The tin printing machine 1 is internally connected with the printing assembly; the tin printing machine 1 is fixedly connected with the second electric push rod 201; the output end of the second electric push rod 201 is fixedly connected with the sliding plate 202; the sliding plate 202, the conveying pull wire 2 and the printing assembly are all connected with the tensioning wheel 203; the printing assembly is connected with two front and back symmetrical fixed blocks 205; the two fixed blocks 205 are fixedly connected with two left and right symmetrical straight light shafts 206; the two straight light shafts 206 are slidably connected with the sliding block 208; the printing assembly and the sliding block 208 are connected with the pull rope 204, and the pull rope 204 is in a C shape under the limitation of the three tensioning wheels 203; the sliding block 208 and the front fixed block 205 are fixedly connected with the two first springs 209; the rear side of the sliding block 208 is fixedly connected with two left and right symmetrical clamping blocks 304; the lower rear part of the steel mesh 105 is fixedly connected with the limiting block 207, and in the initial state, the sliding block 208 is in contact with the limiting block 207 under the pushing of the first spring 209; the sliding block 208 is rotatably connected with the wiping roller 301, and the wiping roller 301 is made of sponge material.

[0035] The printing assembly comprises the electric guide rail 101, the controller 102, the printer 103, the fixed plate 104, the steel mesh 105, the first electric push rod 106, the supporting plate 107 and the visual sensor 108; the tin printing machine 1 is internally provided with the electric guide rail 101; the electric guide rail 101 is slidably connected with the controller 102; the lower side of the controller 102 is slidably connected with the printer 103; the tin printing machine 1 is fixedly connected with the fixed plate 104; the upper side of the sliding plate 202, the front side of the conveying pull wire 2 and the lower side of the fixed plate 104 are fixedly connected with the corresponding tensioning wheel 203; the lower side of the fixed plate 104 is fixedly connected with the fixed block 205; the inner side of the fixed plate 104 is fixedly connected with the steel mesh 105; the printer 103 is in contact with the upper surface of the steel mesh 105; the tin printing machine 1 is fixedly connected with the four first electric push rods 106, and the first electric push rods 106 penetrate through the sliding plate 202; the extension ends of all the first electric push rods 106 are fixedly connected with the supporting plate 107; the supporting plate 107 is located below the conveying pull wire 2, and the lower side of the supporting plate 107 and the front side of the sliding block 208 are fixedly connected with the pull rope 204; the tin printing machine 1 is fixedly connected with the visual sensor 108.

[0036] The front side of the clamping block 304 is provided in an inclined shape, so that the circuit board 555 is conveniently arranged between the two clamping blocks 304.

[0037] The straight light shaft 206 is a chrome-plated light shaft, has high assembly precision, low friction coefficient, reliable operation and long service life.

[0038] A groove 10401 is formed between the middle of the fixing plate 104 and the upper surface of the stencil 105 to prevent the solder paste on the surface of the stencil 105 from flowing outward and spreading, thus preventing waste.

[0039] The protective door 3 is equipped with explosion-proof glass 3001 in the middle, which allows workers to observe the internal operation of the solder paste printing machine 1 through the explosion-proof glass 3001 during operation.

[0040] It also includes heat sinks 109; six heat sinks 109 are fixedly connected to the rear side of the solder paste printer 1. The heat sinks 109 quickly dissipate the heat generated by the solder paste printer 1 during operation, and prevent the internal temperature of the solder paste printer 1 from being too high, which would cause the solder paste to solidify and affect the printing effect.

[0041] The working principle of the above embodiments is as follows:

[0042] The following descriptions are all in the style of Figure 1 Using the perspective reference, the side where solder paste printer number 1 is located is the front side; firstly, as... Figures 1-3 As shown: The circuit board 555 is fed into the solder paste printer 1 from left to right via the conveyor cable 2. When the vision sensor 108 detects that the circuit board 555 has reached directly above the support plate 107, the conveyor cable 2 stops transmitting. Then, the telescopic end of the first electric push rod 106 extends upward, thereby lifting the support plate 107 and the circuit board 555 upward, so that the upper surface of the circuit board 555 contacts the lower surface of the stencil 105. Then, the electric guide rail 101 drives the controller 102 to move forward, and the solder paste on the surface of the stencil 105 is squeezed into the upper surface of the circuit board 555 through the mesh holes in the middle of the stencil 105 via the printer 103. It should be noted that the holes in the middle of the stencil 105 correspond one-to-one with the solder paste printing points on the circuit board 555. Solder paste is printed on the circuit board 555 in this way. After printing is completed, the circuit board 555 is sent out of the solder paste printer 1 via the conveyor cable 2.

[0043] However, during the conveying process of the circuit board 555 via the conveyor cable 2, the circuit board 555 may wobble and shift. Therefore, in the prior art, after the circuit board 555 reaches directly above the support plate 107, it needs to be corrected and positioned. Then, the first electric push rod 106 lifts the support plate 107 and the corrected circuit board 555 upwards, so that the upper surface of the circuit board 555 contacts the lower surface of the stencil 105 before subsequent printing operations. However, when the first electric push rod 106 moves the support plate 107 and the circuit board 555 upwards, the circuit board 555 is prone to wobble. Since the solder paste printing dots on the circuit board 555 are small, even slight wobble can cause a large shift in the printing position. Therefore, the circuit board 555 needs to be clamped and aligned after it contacts the stencil 105 to prevent it from shifting and affecting the printing quality. Figures 3-5As shown: in the initial state, the first spring 209 is in the stretched state, at this time the sliding block 208 is in close contact with the limiting block 207 under the backward push of the first spring 209, the pull rope 204 is in the C-shaped state under the limiting of the three tensioning wheels 203, and is in the tensioning state; when the visual sensor 108 detects that the circuit board 555 is transmitted to the upper side of the supporting plate 107, the conveying pull wire 2 stops transmission, and then the first electric push rod 106 will lift the supporting plate 107 and the circuit board 555 upward, with the upward movement of the supporting plate 107, the supporting plate 107 will pull the pull rope 204 upward, at this time the pull rope 204 moves in the C-shaped state under the limiting of the three tensioning wheels 203, so when one end of the pull rope 204 is pulled upward by the supporting plate 107, the other end of the pull rope 204 will pull the sliding block 208 to move forward on the straight light axis 206, at this time the first spring 209 is compressed and shrinks, when the circuit board 555 is about to contact the steel mesh 105, at this time the sliding block 208 has been pulled to the front of the circuit board 555, that is, the circuit board 555 is located between the limiting block 207 and the sliding block 208, at this time the first electric push rod 106 stops extending, and then the second electric push rod 201 pushes the sliding plate 202 to move upward, at this time the tensioning wheel 203 on the sliding plate 202 also moves upward, in this process, the tensioning force of the tensioning wheel 203 on the sliding plate 202 on the pull rope 204 decreases, the pull rope 204 relaxes the conveying pull wire 2, the first spring 209 extends and resets, and then pulls the sliding block 208 to move backward, and then the sliding block 208 contacts the circuit board 555 and pushes the circuit board 555 backward, so that the rear side of the circuit board 555 contacts the limiting block 207, and then the limiting block 207 and the sliding block 208 clamp and position the circuit board 555 in the front-rear direction; and when the sliding block 208 contacts the front side of the circuit board 555, two clamping blocks 304 are added on the sliding block 208, so that the circuit board 555 enters between the two clamping blocks 304, and then the clamping blocks 304 clamp and fix the circuit board 555 in the left-right direction, and the front side of the clamping block 304 is inclined, which is convenient for the circuit board 555 to enter between the two clamping blocks 304; it is known that the circuit board 555 has not contacted the steel mesh 105 at this time, so as to facilitate the clamping and positioning of the sliding block 208 and the clamping block 304 on the circuit board 555; after the circuit board 555 is positioned, the first electric push rod 106 and the second electric push rod 201 are controlled to extend upward together, so that the circuit board 555 is in close contact with the lower surface of the steel mesh 105, thereby preventing the corrected circuit board 555 from shaking and deviating during the upward movement and contacting the steel mesh 105, which affects the subsequent printing effect;

[0044] Further, although the printer 103 in the prior art device has a cleaning function and can clean the upper surface of the steel mesh 105, it cannot clean the lower surface of the steel mesh 105. Therefore, in order to ensure that the steel mesh 105 is clean and dust-free and to ensure the quality of the solder paste printing, an additional cleaning mechanism is needed to clean the lower surface of the steel mesh 105 after each printing, which is complicated and greatly reduces the production efficiency. Therefore, the wiping roller 301 is arranged on the upper side of the sliding block 208. During the process in which the supporting plate 107 moves upward and drives the sliding block 208 to move forward through the pull rope 204, the wiping roller 301 on the upper side of the sliding block 208 will contact the lower surface of the steel mesh 105, thereby wiping the lower surface of the steel mesh 105 before the circuit board 555 is printed. After the printing is completed, when the first electric push rod 106 and the second electric push rod 201 are retracted, the supporting plate 107 and the sliding plate 202 move downward and reset, the first spring 209 of the conveying pull line 2 pulls the sliding block 208 to move backward and reset, thereby wiping the lower surface of the steel mesh 105 after the printing of the circuit board 555 is completed. The wiping roller 301 is made of sponge material, which will be extruded after contacting the surface of the steel mesh 105 and then enter the mesh holes on the steel mesh 105, thereby removing the residual solder paste in the mesh holes, which is beneficial to ensure the cleanliness of the lower surface of the steel mesh 105. The cleaning action of the steel mesh 105 is combined with the resetting action of the first electric push rod 106 and the second electric push rod 201, and no additional cleaning process is needed, which greatly improves the production efficiency.

[0045] On the basis of the above technical effects, the present application also has the following advantages:

[0046] The straight light axis 206 is a chromium-plated light axis, which has high assembly precision, low friction coefficient, reliable operation and long service life.

[0047] The recess 10401 is formed between the middle part of the fixed plate 104 and the upper surface of the steel mesh 105, which prevents the solder paste on the surface of the steel mesh 105 from flowing outward and diffusing, thereby causing waste.

[0048] The explosion-proof glass 3001 is arranged in the middle part of the protective door 3, which facilitates workers to observe the running status of the machine inside through the explosion-proof glass 3001 during the operation of the solder paste printer 1.

[0049] The radiator 109 is arranged at the rear side of the solder paste printer 1, which quickly dissipates the heat generated during the operation of the solder paste printer 1, thereby preventing the solder paste from solidifying due to the high temperature inside the solder paste printer 1, which affects the printing effect.

[0050] Example 2

[0051] On the basis of Example 1, as Figures 3-6The air inlet pipe 302 and the connecting pipe 303 are further included; the air suction port 20801 is arranged on the front side of the sliding block 208, the air blowing port 20802 is arranged on the rear side of the sliding block 208, the wiping roller 301 is located between the air suction port 20801 and the air blowing port 20802, and the air pump is arranged in the solder paste printing machine 1.

[0052] The air inlet cavity 30401, the clamping plate 305 and the second spring 306 are further included; the air inlet cavity 30401 is arranged in each clamping block 304; the air inlet cavity 30401 is in communication with the connecting pipe 303, and the electromagnetic valve is arranged at the communication position of the air inlet cavity 30401 and the connecting pipe 303; the clamping plate 305 is slidably connected to the facing side of each clamping block 304; the second spring 306 is fixedly connected between the clamping plate 305 and the clamping block 304; the sliding end of each clamping plate 305 penetrates through the corresponding clamping block 304 and is located in the corresponding air inlet cavity 30401.

[0053] The conductive sheet 307 is further included; the conductive sheet 307 is arranged on the contact surface of each sliding block 208 and the steel mesh 105, and the conductive sheet 307 is grounded.

[0054] The working principle of the above embodiment is as follows:

[0055] After the sponge material wiping roller 301 described in embodiment 1 is used to clean the dust and impurities on the lower surface of the steel mesh 105 and the residual solder paste in the mesh hole, the dust and impurities and the residual solder paste will adhere to the surface of the wiping roller 301, so that the worker needs to frequently replace and clean the wiping roller 301, which affects the production efficiency; therefore, when the sliding block 208 moves left and right, the air pump in the solder paste printing machine 1 sucks air into the air inlet pipe 302, so that the air suction port 20801 generates suction force, and then the air suction port 20801 is used to suck the dust and impurities and the residual solder paste that are easy to fall off from the lower surface of the steel mesh 105, and then the wiping roller 301 is used to wipe the dust and impurities and the residual solder paste that are strongly adhered, and the dust and impurities and the residual solder paste wiped down are further sucked and removed, so that the cleaning effect is improved, and the wiping roller 301 is prevented from adhering too much dust and impurities and residual solder paste; however, the residual solder paste is sucked through the air suction port 20801, which will waste a large amount of solder paste and increase the production cost, so that the air blowing port 20802 is arranged on the rear side of the sliding block 208, and the air blowing port 20802 is used to blow air to the wiping roller 301, so that the residual solder paste on the surface of the wiping roller 301 is blown off, and the residual solder paste is prevented from being sucked through the air suction port 20801. Figure 5As shown: when the printing is completed, the first electric push rod 106 drives the supporting plate 107 and the circuit board 555 to move downward and reset, and then drives the sliding block 208 to move backward and reset, at this time, the steel mesh 105 just performs the printing operation, and there is residual solder paste in the mesh hole, at this time, the air pump in the solder paste printing machine 1 blows air into the air inlet pipe 302, at this time, the electromagnetic valve at the connecting pipe 303 and the air outlet 20802 is opened, and the electromagnetic valve at the connecting pipe 303 and the air inlet 20801 is closed, so that the gas is blown out from the air outlet 20802 upward through the connecting pipe 303, and then the solder paste in the mesh hole is blown out upward and blown to the upper surface of the steel mesh 105, and it is known that in the process of the first electric push rod 106 retracting and resetting to drive the sliding block 208 to move backward, the electric guide rail 101 also drives the printer 103 to move backward and reset synchronously, and the existing printer 103 is usually provided with a solder paste suction device, and the residual solder paste on the surface of the steel mesh 105 is sucked back into the printer 103 through the solder paste suction device for recycling, so as to suck the solder paste blown into the upper surface of the steel mesh 105 from the mesh hole of the steel mesh 105, and then recycle for subsequent use, thereby reducing the waste of solder paste and reducing the production cost; and then when printing the next circuit board 555, in the process of the first electric push rod 106 driving the supporting plate 107 and the circuit board 555 to move upward and drive the sliding block 208 to move forward, the air pump in the solder paste printing machine 1 sucks air into the air inlet pipe 302, at this time, the electromagnetic valve at the connecting pipe 303 and the air outlet 20802 is closed, and the electromagnetic valve at the connecting pipe 303 and the air inlet 20801 is opened, so that the gas enters the air inlet 20801 through the connecting pipe 303, so that the air inlet 20801 generates suction force, and then the dust and impurities on the lower surface of the steel mesh 105 are sucked and removed; it is known that before printing, the solder paste in the mesh hole of the steel mesh 105 is blown out during the last printing operation, and there is an interval time between the two printing operations, at this time, the steel mesh 105 may generate static electricity due to friction, and the dust and impurities are adsorbed, so the dust and impurities on the lower surface of the steel mesh 105 need to be sucked and removed, when the first electric push rod 106 retracts and resets, at this time, the circuit board 555 just leaves the lower surface of the steel mesh 105, so the lower surface of the steel mesh 105 has not adsorbed the dust and impurities, but there is residual solder paste in the mesh hole of the steel mesh 105, so the residual solder paste in the mesh hole of the steel mesh 105 needs to be blown upward to the upper surface of the steel mesh 105;

[0056] Further, when the circuit board 555 is small, the clamping block 304 cannot clamp the left and right positions of the circuit board 555, so when clamping and positioning the left and right positions of the circuit board 555 by the clamping block 304, Figure 5 and 6As shown: when the second electric push rod 201 moves upward, air is blown into the air inlet pipe 302 through the air pump in the tin paste printing machine 1, at this time, the electromagnetic valve at the connecting pipe 303 and the air blowing port 20802 is closed, the electromagnetic valve at the connecting pipe 303 and the air suction port 20801 is closed, and the electromagnetic valve at the connecting pipe 303 and the air inlet cavity 30401 is opened, thereby blowing air into the air inlet cavity 30401, and then the air pressure in the air inlet cavity 30401 increases, thereby extruding the clamping plate 305, and then the second spring 306 is pressed and shrunk, the two clamping plates 305 are close to each other, thereby clamping and positioning the left and right positions of the circuit board 555, and adapting to circuit boards 555 of different sizes.

[0057] On the basis of the above technical effects, the present application also has the following advantages:

[0058] The contact surface of the sliding block 208 and the steel mesh 105 is provided with an electrically conductive sheet 307, and the electrically conductive sheet 307 is grounded; in the process of sliding the sliding block 208 left and right, the static electricity generated by the friction on the surface of the steel mesh 105 is absorbed by the electrically conductive sheet 307 and introduced into the ground, thereby removing the static electricity on the surface of the steel mesh 105, reducing the static electricity adsorption of the dust around the surface of the steel mesh 105 in the friction process, and affecting the subsequent tin paste printing quality.

[0059] Although the present disclosure has been described only with respect to a limited number of embodiments, those skilled in the art who benefit from the present disclosure will understand that various other embodiments can be designed without departing from the scope of the present application. Therefore, the scope of the present application should only be limited by the appended claims.

Claims

1. An automatically positioned circuit board solder paste printing apparatus comprising The utility model provides a tin printing machine, a conveying pull line and a protective door, the tin printing machine (1) is provided with the conveying pull line (2), the tin printing machine (1) is movably connected with the protective door (3), further include printing assembly, second electric push rod (201), sliding plate (202), tension pulley (203), pull rope (204), fixed block (205), straight line optical axis (206), limit block (207), sliding block (208), first spring (209), wiping roller (301) and clamping block (304), the tin printing machine (1) is connected with printing assembly for the tin printing of circuit board (555), the tin printing machine (1) is fixedly connected with second electric push rod (201), the output of second electric push rod (201) is fixedly connected with sliding plate (202), sliding plate (202), conveying pull line (2) and printing assembly are connected with tension pulley (203), printing assembly is connected with two front and back symmetry fixed block (205), two fixed block (205) are jointly fixedly connected with two left and right symmetry straight line optical axis (206), two straight line optical axis (206) are jointly slidably connected with the sliding block (208) for the clamping positioning of circuit board (555) front and back direction, printing assembly and sliding block (208) are jointly connected with pull rope (204), and pull rope (204) is under the limitation of three tension pulleys (203) C shape, a plurality of first spring (209) are fixedly connected between sliding block (208) and the fixed block (205) of front side, the rear side of sliding block (208) is fixedly connected with two left and right symmetry clamping block (304) for the clamping positioning of circuit board (555) left and right direction, the lower rear of steel net (105) is fixedly connected with limit block (207), the wiping roller (301) for wiping steel net (105) is rotatably connected on sliding block (208).

2. The apparatus according to claim 1, wherein the apparatus is characterized by: The printing assembly comprises an electric guide rail (101), a controller (102), a printer (103), a fixed plate (104), a steel mesh (105), a first electric push rod (106), a supporting plate (107) and a visual sensor (108); the tin solder printer (1) is provided with the electric guide rail (101); the electric guide rail (101) is slidably connected with the controller (102); the lower side of the controller (102) is slidably connected with the printer (103); the tin solder printer (1) is fixedly connected with the fixed plate (104); the upper side of the sliding plate (202), the front side of the conveying pull wire (2) and the lower side of the fixed plate (104) are fixedly connected with corresponding tension pulleys (203); the lower side of the fixed plate (104) is fixedly connected with a fixed block (205); the inner side of the fixed plate (104) is fixedly connected with the steel mesh (105); the printer (103) is in contact with the upper surface of the steel mesh (105); the tin solder printer (1) is fixedly connected with a plurality of first electric push rods (106), and the first electric push rods (106) penetrate through the sliding plate (202); the extension ends of all the first electric push rods (106) are fixedly connected with the supporting plate (107) for abutting the circuit board (555) against the lower side of the steel mesh (105); the supporting plate (107) is located below the conveying pull wire (2), and the lower side of the supporting plate (107) and the front side of the sliding block (208) are fixedly connected with the pull rope (204); the tin solder printer (1) is fixedly connected with the visual sensor (108).

3. The apparatus according to claim 1, wherein the apparatus further comprises a circuit board positioning device for positioning the circuit board on the circuit board support in a predetermined position. The front side of the clamping block (304) is provided in an inclined shape.

4. The apparatus according to claim 1, wherein the apparatus further comprises a circuit board positioning device for positioning the circuit board on the circuit board support in a predetermined position. The straight light axis (206) is a chrome-plated light axis.

5. The apparatus according to claim 2, wherein the apparatus further comprises a circuit board positioning device for positioning the circuit board on the circuit board support in the circuit board positioning device, and the circuit board positioning device is controlled by the control device. The middle part of the fixed plate (104) and the upper surface of the steel mesh (105) form a groove (10401).

6. The apparatus according to claim 1, wherein the apparatus further comprises a circuit board positioning device for positioning the circuit board on the circuit board support in a predetermined position. The middle part of the protective door (3) is provided with an explosion-proof glass (3001).

7. The apparatus according to claim 1, wherein the apparatus further comprises a circuit board positioning device for positioning the circuit board on the circuit board support in a predetermined position. Further comprising a radiator (109); the rear side of the tin solder printer (1) is fixedly connected with a plurality of radiators (109).

8. The apparatus according to claim 1, wherein the apparatus further comprises a circuit board positioning device for positioning the circuit board on the stage. Further comprising an air inlet pipe (302) and a connecting pipe (303); the front side of the sliding block (208) is provided with an air suction port (20801), the rear side of the sliding block (208) is provided with an air blowing port (20802), the wiping roller (301) is located between the air suction port (20801) and the air blowing port (20802), and the tin solder printer (1) is provided with an air pump; the sliding block (208) and the air pump are in communication with the air inlet pipe (302); the air inlet pipe (302) and the air suction port (20801) and the air blowing port (20802) are in communication with the connecting pipe (303); the connecting pipe (303) is provided with an electromagnetic valve at the connection with the air suction port (20801) and the air blowing port (20802).

9. An apparatus for automatically positioning a circuit board for printing of solder paste according to claim 8, wherein It also includes the air inlet cavity (30401), clamping plate (305) and second spring (306); each clamping block (304) is provided with air inlet cavity (30401); air inlet cavity (30401) and connecting pipe (303) are communicated, and the air inlet cavity (30401) and the connecting pipe (303) are communicated; the electromagnetic valve is arranged at the air inlet cavity (30401) and the connecting pipe (303); the opposite sides of the two clamping blocks (304) are slidably connected with the clamping plates (305); the clamping plates (305) and the clamping blocks (304) are fixedly connected with a plurality of second springs (306); the sliding end of each clamping plate (305) penetrates through the corresponding clamping block (304), and is located in the corresponding air inlet cavity (30401).

10. The apparatus according to claim 8, wherein the apparatus further comprises a circuit board positioning device for positioning the circuit board on the stage. It also includes a conductive sheet (307); the contact surface of each sliding block (208) and the steel mesh (105) is provided with a conductive sheet (307) for removing the static electricity on the surface of the steel mesh (105), and the conductive sheet (307) is grounded.

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