CN111532015B

CN111532015B - Constant temperature solder paste printing machine

Info

Publication number: CN111532015B
Application number: CN202010271240.0A
Authority: CN
Inventors: 向少堂
Original assignee: Guizhou Hanrui Electronics Co ltd
Current assignee: GUIZHOU HANRUI ELECTRONICS CO.,LTD.
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2021-12-10
Anticipated expiration: 2040-04-08
Also published as: CN111532015A

Abstract

The invention relates to the technical field of circuit board processing, and discloses a constant-temperature solder paste printing machine which comprises a machine body, a screen printing plate, a sliding rail and a scraper, wherein the screen printing plate is installed at the top of the machine body, the sliding rail is installed at the top of the machine body and is positioned above the screen printing plate, the scraper is installed on the sliding rail and axially moves along the sliding rail, and heating bases are fixedly installed on two sides of the screen printing plate. Through the cooperation of heating base and play feed cylinder, make the tin cream be in the constant temperature state all the time, thereby guarantee the mobility of tin cream, and then make the scraper remove at every turn when tip, the tip contact of scraper side and threaded rod, make the slide bar slide to the inboard, and then utilize the connecting rod effect, drive jack-up with the piston, thereby open the export in tin cream district, flow into the half tone with proper amount tin cream through the guide plate, it leans on the half tone left side to recycle the rise and fall difference of scraper, the left side scraper whereabouts, the right side scraper lifts up, lean on the half tone right side, the left side scraper lifts up, the right side scraper whereabouts, cut the tin cream.

Description

Constant temperature solder paste printing machine

Technical Field

The invention relates to the technical field of circuit board processing, in particular to a constant-temperature solder paste printer.

Background

During the production process of the circuit board, a tin paste printer is usually used to attach the tin solution to the circuit board, so as to increase the stability of the circuit board.

The working principle of the solder paste printing machine is shown in fig. 3, a proper amount of solder paste is poured into a screen printing plate, then a circuit board to be printed is fixed on a printing positioning table, then the solder paste or red glue is printed on a corresponding bonding pad through a steel mesh by a left scraper and a right scraper of the printing machine in a missing manner (the scrapers are composed of two scrapers, in the lifting process, usually one scraper falls down, the other scraper rises up, so that the solder paste is not scraped out of the screen printing plate when the scrapers slide left and right, the lifting state of the scrapers is automatically switched when the scrapers move to a limit position), a PCB with uniform missing print is input into a chip mounter through a transmission table for automatic chip mounting, because the solder paste is poured into the screen printing plate in advance, the solder paste is exposed in the air, the effect of the scrapers moves, the solder paste is continuously turned over, the temperature of the solder paste is continuously reduced, and the flowability of the solder paste is further reduced, on one hand, the solder paste is adsorbed on the scrapers, cause the level and smooth scraper to appear irregularly, strike off the in-process, the phenomenon that thickness differs appears, and the tin cream that on the other hand sclerosis adsorbs on the half tone hole, leads to partial mesh to be blockked up, and tin cream can't see through the mesh that blocks up when printing, prints to the circuit board on, leads to tin cream printing incomplete, influences the quality of circuit board.

Disclosure of Invention

Aiming at the defects of the background technology, the invention provides a constant-temperature solder paste printing machine which has the advantages of uniform printing and strong solder paste fluidity, and solves the problems that the fluidity of the solder paste is poor, the solder paste can be adsorbed on a scraper, the smooth scraper is irregular, the thickness is different in the scraping process, the hardened solder paste is adsorbed on screen holes, partial mesh holes are blocked, the solder paste cannot penetrate through the blocked mesh holes during printing and is printed on a circuit board, the solder paste printing is incomplete, and the quality of the circuit board is influenced.

The invention provides the following technical scheme: a constant-temperature tin paste printing machine comprises a machine body, a screen printing plate, a slide rail and a scraper, wherein the screen printing plate is arranged at the top of the machine body, the slide rail is arranged at the top of the machine body and is positioned above the screen printing plate, the scraper is arranged on the slide rail and axially moves along the slide rail, heating bases are fixedly arranged on two sides of the screen printing plate, a discharging barrel is fixedly connected to the top of the heating base, a guide plate close to the inner side of the screen printing plate is fixedly connected to the side surface of the discharging barrel, the tail end of the guide plate is contacted with the top of the screen printing plate, a slide rod positioned above the guide plate is slidably connected to the side surface of the discharging barrel, a threaded rod is connected to the side surface of the slide rod in a threaded manner, the shape of the end part of the slide rod positioned in the discharging barrel is a concave shape inclining to the left, a rotating shaft is rotatably connected to the end part of the slide rod, a connecting rod is arranged on the rotating shaft, and the tail end of the connecting rod is rotatably connected with a positioning rod, the tail end of the positioning rod is rotatably connected with a positioning shaft, the bottom of the positioning shaft is fixedly connected with a piston, a positioning plate located inside the discharging barrel is sleeved on the sliding rod, a spring located outside the sliding rod is fixedly connected to the side face of the positioning plate, and the end portion of the spring is fixedly connected with the inner wall of the discharging barrel.

Preferably, the shape of the guide plate is concave, the guide plate is made of stainless steel, and the inclination angle of the guide plate is 50-70 degrees.

Preferably, the connecting rod is provided with a sliding groove, the inner wall of the discharge barrel is fixedly connected with a supporting rod, the end part of the supporting rod extends to the outside of the sliding groove, and the outer wall of the supporting rod is connected with the inner wall of the sliding groove in a sliding manner.

Preferably, the discharging barrel consists of a solder paste area and a dead area, the dead area is used for sliding of the sliding rod, the outer wall of the piston is in sliding connection with an outlet of the solder paste area, the length and the width of the piston are greater than those of the outlet of the solder paste area, the length and the width of the outlet of the solder paste area are equal to those of the scraper, the outlet of the solder paste area is closed in the initial state of the piston, and the outlet of the solder paste area is opened and closed in a sliding mode by the piston.

The invention has the following beneficial effects:

1. this constant temperature tin cream printing machine, cooperation through heating base and play feed cylinder, make the tin cream be in the constant temperature state all the time, thereby guarantee the mobility of tin cream, and then make the scraper remove at every turn when the tip, the scraper side contacts with the tip of threaded rod, make the slide bar slide to the inboard, and then utilize the connecting rod effect, drive the jack-up with the piston, thereby open the export in tin cream district, flow into the half tone with proper amount tin cream through the guide plate, it leans on the half tone left side to recycle the rise and fall difference of scraper, the left side scraper whereabouts, the right side scraper lifts up, lean on the half tone right side when, the left side scraper lifts up, the right side scraper whereabouts, cut off the tin cream, do axial motion along the surface of half tone, make the output of tin cream be directly proportional with the printing of circuit board, guarantee the quality of circuit board when the printing.

2. This constant temperature solder paste printing machine, design through the both sides threaded rod, when making the scraper remove extreme position, the homoenergetic has the solder paste to flow from both sides, through pouring the formula solder paste into the tradition, optimize for the outflow formula solder paste, simultaneously through the screw thread design of threaded rod and slide bar, thereby the length of control threaded rod, thereby change the outflow of solder paste, the threaded rod is longer, the solder paste outflow is more, the threaded rod is shorter more, the solder paste outflow is less, also closed threaded rod simultaneously, the outflow of assurance solder paste is directly proportional with the printing, the solder paste is excessive has been solved simultaneously, along with the reduction of solder paste temperature, the solder paste solidifies, influence the problem of printing quality.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged schematic structural view of the discharging barrel;

fig. 3 is a schematic diagram of a conventional structure.

In the figure: 1. a body; 2. screen printing; 3. a slide rail; 4. a scraper; 5. heating the base; 6. a discharging barrel; 7. a baffle; 8. a slide bar; 9. a threaded rod; 10. a rotating shaft; 11. a connecting rod; 12. a support bar; 13. positioning a rod; 14. positioning the shaft; 15. a piston; 16. positioning a plate; 17. a spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, a constant temperature solder paste printing machine comprises a machine body 1, a screen 2, a slide rail 3 and a scraper 4, wherein the screen 2 is installed on the top of the machine body 1, the slide rail 3 is installed on the top of the machine body 1 and located above the screen 2, the scraper 4 is installed on the slide rail 3 and axially moves along the slide rail 3, heating bases 5 are fixedly installed on both sides of the screen 2, the heating bases 5 generate heat through resistance wires with built-in heating tubes according to the principle, the heat is transmitted to a discharge barrel 6 through an aluminum plate for heating, the top of the heating bases 5 is fixedly connected with the discharge barrel 6, the discharge barrel 6 is arc-shaped close to the inner side of the screen 2, the capacity of the discharge barrel 6 is increased, the discharge barrel is made of heat conducting material, a guide plate 7 close to the inner side of the screen 2 is fixedly connected to the side of the discharge barrel 6, the tail end of the guide plate 7 is in contact with the top of the screen 2, the side surface of the discharge cylinder 6 is slidably connected with a sliding rod 8 positioned above the guide plate 7, one end of the sliding rod 8 penetrates through and extends into the discharge cylinder 6 and is slidably connected with the inner wall of the discharge cylinder 6, the side surface of the sliding rod 8 is in threaded connection with a threaded rod 9, an internal thread is arranged on the sliding rod 8, so that the sliding rod and the sliding rod are in threaded connection, the end part of the sliding rod 8 positioned in the discharge cylinder 6 is in a concave shape inclining to the left, the end part of the sliding rod 8 is rotatably connected with a rotating shaft 10, a connecting rod 11 is installed on the rotating shaft 10, the tail end of the connecting rod 11 is rotatably connected with a positioning rod 13, the tail end of the positioning rod 13 is rotatably connected with a positioning shaft 14, the bottom of the positioning shaft 14 is fixedly connected with a piston 15, the piston 15 is made of high-temperature-resistant rubber, the sliding rod 8 is sleeved with a positioning plate 16 positioned in the discharge cylinder 6, and the side surface of the positioning plate 16 is fixedly connected with a spring 17 positioned outside the sliding rod 8, the end part of the spring 17 is fixedly connected with the inner wall of the discharging barrel 6.

The shape of the guide plate 7 is concave, the guide plate 7 is made of stainless steel, the inclination angle of the guide plate 7 is 50-70 degrees, flowing of solder paste is facilitated, and cleaning of solidified solder paste is facilitated.

Wherein, the spout has been seted up on connecting rod 11, go out inner wall fixedly connected with bracing piece 12 of feed cylinder 6, the design of bracing piece 12 becomes connecting rod 11 lever rotation for connecting rod 11 uses bracing piece 12 to rotate about as the axial, thereby drives the terminal lifting that makes progress of connecting rod 11, the tip of bracing piece 12 extends to the outside of spout, and the inner wall sliding connection of outer wall and spout.

The discharging barrel 6 is composed of a solder paste area and a vacant area, the vacant area is used for sliding of the sliding rod 8, the outer wall of the piston 15 is connected with an outlet of the solder paste area in a sliding mode, the length and the width of the piston 15 are larger than those of an outlet of the solder paste area, the length and the width of the outlet of the solder paste area are equal to those of the scraper 4, the outlet of the solder paste area is closed in the initial state of the piston 15, the outlet of the solder paste area is opened and closed in the sliding mode of the piston 15, the outflow of the solder paste is controlled by means of movement of the piston 15, the opening area of the outlet of the solder paste area is controlled by means of the length of the threaded rod 9, and the flowing speed of the solder paste is controlled by means of inclination of the guide plate 7.

The working principle is that solder paste is added into a discharging barrel 6, then a heating base 5 is started to release constant temperature heat, the fluidity of the solder paste is kept, then the length of a threaded rod 9 is adjusted, the outflow of the solder paste is controlled, then a scraper 4 can be started to work (the solder paste is coated on a screen printing plate 2 in advance), the threaded rod 9 is jacked each time the scraper 4 moves to a limit position, at the moment, the threaded rod 9 drives a sliding rod 8 to slide inwards to drive a connecting rod 11 to slide towards the left side, the connecting rod 11 continuously rotates towards the left side by utilizing the lever principle to drive the tail end of the connecting rod 11 to be lifted, then the positioning rod 13 and a piston 15 are driven to be lifted, so that an outlet of a solder paste area is opened, when the solder paste flows into a scraper at the right side through a guide plate 7, then the scraper at the right side is lifted, the scraper at the left side falls down to scrape the flowing solder paste onto the screen printing plate 2, then the tension of a spring 17 is released along with the leaving of the scraper 4, the positioning plate 16 is pulled to return to the initial position, so that the sliding rod 8 and the connecting rod 11 are driven to return, and then the piston 15 is closed to block the solder paste area outlet.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a constant temperature tin cream printing machine, includes organism (1), half tone (2), slide rail (3), scraper (4), the top at organism (1) is installed in half tone (2), slide rail (3) are installed at the top of organism (1) and are located the top of half tone (2), axial motion, its characterized in that are installed on slide rail (3) and along slide rail (3) in scraper (4): the screen printing machine is characterized in that heating bases (5) are fixedly mounted on two sides of the screen printing plate (2), a discharging barrel (6) is fixedly connected to the top of the heating base (5), a guide plate (7) close to the inner side of the screen printing plate (2) is fixedly connected to the side face of the discharging barrel (6), the tail end of the guide plate (7) is in contact with the top of the screen printing plate (2), a sliding rod (8) located above the guide plate (7) is connected to the side face of the discharging barrel (6) in a sliding mode, a threaded rod (9) is connected to the side face of the sliding rod (8) in a threaded mode, the sliding rod (8) is located in the discharging barrel (6) and is in a concave mode of inclining to the left, a rotating shaft (10) is connected to the end portion of the sliding rod (8), a connecting rod (11) is mounted on the rotating shaft (10), a positioning rod (13) is connected to the tail end of the connecting rod (11) in a rotating mode, a positioning shaft (14) is connected to the tail end of the positioning rod (13) in a rotating mode, the bottom of the positioning shaft (14) is fixedly connected with a piston (15), the sliding rod (8) is sleeved with a positioning plate (16) positioned in the discharging barrel (6), the side surface of the positioning plate (16) is fixedly connected with a spring (17) positioned outside the sliding rod (8), and the end part of the spring (17) is fixedly connected with the inner wall of the discharging barrel (6);

go out feed cylinder (6) and constitute by tin cream district and dead zone, the dead zone is used for the slip of slide bar (8), the outer wall of piston (15) and the export sliding connection in tin cream district, the length and the width of piston (15) are greater than the length and the width that the export was distinguished in the tin cream, the length and the width that the export was distinguished in the tin cream district are equal with the length width of scraper (4), the export is distinguished in the closed tin cream of piston (15) initial condition, piston (15) slip opens and shuts the export in tin cream district.

2. A constant temperature solder paste printer according to claim 1, characterised in that: the shape of guide plate (7) is concave type, the material of guide plate (7) is stainless steel, and the inclination of guide plate (7) is 50-60 degrees.

3. A constant temperature solder paste printer according to claim 1, characterised in that: the material discharging device is characterized in that a sliding groove is formed in the connecting rod (11), a supporting rod (12) is fixedly connected to the inner wall of the material discharging barrel (6), the end portion of the supporting rod (12) extends to the outer portion of the sliding groove, and the outer wall of the supporting rod is connected with the inner wall of the sliding groove in a sliding mode.