CN110789220A

CN110789220A - Circuit board printing device

Info

Publication number: CN110789220A
Application number: CN201911154805.0A
Authority: CN
Inventors: 仇海艳
Original assignee: Suzhou Huiliyuan Technology Co Ltd
Current assignee: Suzhou Huiliyuan Technology Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-02-14

Abstract

The invention discloses a circuit board printing device, relates to the related field of circuit board printing, and aims to solve the problem that in the prior art, heat is dissipated in the drying process, and is not concentrated on a printing part, so that the drying time is long. First drying device is installed to the centre of workstation up end rear end, second drying device is installed to the centre of workstation up end front end, and first drying device and second drying device all are connected through the draw runner with the workstation, and the inside of first drying device and second drying device all embedding workstation, first drying device and second drying device all include outer frame, place the groove, connect telescopic link, drying plate, shifting chute, drying area, drying device backup pad and compression spring.

Description

Circuit board printing device

Technical Field

The invention relates to the field related to circuit board printing, in particular to a circuit board printing device.

Background

Conductive patterns formed by making printed circuits, printed components, or a combination of both, on an insulating material in a predetermined design are commonly referred to as printed circuits. And a conductive pattern on the insulating substrate that provides electrical connection between the components is called a printed wiring. The finished board of the printed circuit or printed circuit is then referred to as a printed circuit board, also known as a printed circuit board or printed circuit board. The ink printing in the production process of the printed circuit board can be divided into photosensitive line ink printing, solder resist ink and character ink printing, wherein the photosensitive line ink printing is full-page printing and has no requirement on graphic alignment. Therefore, the screen printing machine suitable for printing the ink on the photosensitive line can realize the rapid batch printing of the ink only by being provided with the positioning pin; the printing of solder resist ink and character ink belongs to graphic printing, and the used screen printer has to be provided with a light source alignment system and a platform precision adjustment system to meet the process requirements.

However, most of the drying methods of the existing printing devices are that a heating rod or other related structures are arranged in a box body for heating, but the heat of the method is distributed in the whole space instead of drying the printed part in a centralized manner, so that the drying time is longer after the printing is finished; therefore, the market is urgently in need of developing a circuit board printing device to help people solve the existing problems.

Disclosure of Invention

The present invention is directed to a circuit board printing apparatus, which solves the problem of long drying time caused by heat dissipation and heat not concentrated on the printed portion during the drying process proposed in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: a circuit board printing device comprises a workbench, wherein a first drying device is installed in the middle of the rear end of the upper end face of the workbench, a second drying device is installed in the middle of the front end of the upper end face of the workbench, the first drying device and the second drying device are connected with the workbench through sliding strips, the first drying device and the second drying device are embedded into the workbench, the first drying device and the second drying device respectively comprise an outer frame, a placing groove, a connecting telescopic rod, a drying plate, a moving groove, a drying area, a drying device supporting plate and a pressure spring, the placing groove is located in the middle of the outer frame, the connecting telescopic rod is located on two sides of the inner portion and rotatably connected with the outer frame through a mounting piece, the connecting telescopic rod comprises a rod body and a sleeve pipe, the rod body is connected with the sleeve pipe through threads, a supporting piece is arranged at the upper end of the rod body, the drying plate is located on one, the drying plate is rotatably connected with the outer frame through a rotating shaft, the size of the drying plate is the same as that of the placing groove, the thickness of the drying plate is smaller than the depth of the placing groove, the moving groove is positioned at one end of two sides of the lower end surface of the drying plate, the diameter of the supporting sheet is smaller than the width of the moving groove, the drying area is positioned at one end of the middle of the lower end surface of the drying plate, an electric heating wire is arranged in the drying area, a drying device supporting plate is positioned in the middle of one side of the outer frame, the drying device supporting plate is rotatably connected with the outer frame through the rotating shaft, the drying device supporting plate is embedded in the outer frame, a pressure spring is positioned between the outer frame and the drying device supporting plate, the pressure spring is connected to the lower end of one side of the drying device supporting plate, a first notch is arranged at one side of the drying plate on, the middle of the lower end face of the first notch and the middle of the upper end face of the second notch are respectively provided with a connecting magnet, the upper drying plate of the first drying device is connected with the upper drying plate of the second drying device through the connecting magnet, and the upper drying area of the first drying device is connected with the upper drying area of the second drying device.

Preferably, a movable support plate is arranged in the middle of the upper end of the workbench, a printing jig is arranged at the upper end of the movable support plate, first horizontal teeth are arranged on two sides of the lower end of the printing jig, first rotating members are mounted on two sides of the upper end of the movable support plate and embedded into the movable support plate to be rotatably connected with the movable support plate, each first rotating member comprises a first rotating tooth and a smooth arc surface, the first rotating teeth are meshed with the first horizontal teeth, a first motor is mounted at the rear end of each first rotating member, second longitudinal teeth are arranged at the front end and the rear end of the lower end of the movable support plate, a second rotating member is arranged at the lower end of each second longitudinal tooth and comprises a second rotating tooth, the second rotating teeth are meshed with the second longitudinal teeth, a second motor is mounted on one side of the second rotating member, and the first rotating member, the first horizontal teeth, the first motor and the second rotating members, The second longitudinal tooth is perpendicular to the arrangement direction of the second motor.

Preferably, the upper end of the printing jig is provided with a frame, a silk screen is arranged inside the frame, the periphery of the upper end face of the printing jig is provided with a lower friction gasket, the periphery of the lower end face of the frame is provided with an upper friction gasket, friction patterns are arranged on the upper friction gasket and the lower friction gasket, and the size of the lower friction gasket is the same as that of the upper friction gasket.

Preferably, the upper end of frame is provided with the shell body, and the shell body passes through the connecting block with the frame to be connected, and the frame passes through the turn-up bolt fastening with the connecting block, drive gear is installed to the inside centre of shell body, driven gear is installed to the inside both sides of shell body, the driving band is installed in driven gear and the drive gear outside, and driving band and driven gear and drive gear meshing, the lower extreme of driving band is provided with the scraper, and the scraper is fixed with the driving band, and the centre of terminal surface is seted up slottedly under the shell body.

Preferably, the optical alignment cameras are installed at four corners of the inner side of the lower end of the outer shell, and the optical alignment cameras are arranged on the outer side of the groove.

Preferably, four corners outside the lower end of the outer shell are provided with limiting rods, the lower ends of the limiting rods are provided with limiting columns, the limiting rods are connected with the limiting columns in an embedded mode, and the limiting columns are fixed with the workbench.

Preferably, the middle of the upper end face of the printing jig is provided with a limiting groove, four corners of the lower bottom face of the limiting groove are provided with alignment points, a printed circuit board is arranged inside the limiting groove, and the height of the printed circuit board is greater than that of the limiting groove.

Preferably, both sides of the upper end of the workbench are provided with connecting supports, the connecting supports are fixed to the workbench in a welding mode, an electric telescopic mechanism is installed in the middle of the upper end of the connecting supports, and the electric telescopic mechanism comprises a driving telescopic rod.

Compared with the prior art, the invention has the beneficial effects that:

1. in the invention, a first drying device and a second drying device are arranged, after printing is finished, the first drying device and the second drying device are lifted, under the action of the resilience force of a pressure spring, a drying device supporting plate is popped out, a drying plate is pulled open, a connecting telescopic rod is rotated out, a rod body connected with the telescopic rod and a sleeve are extended through threads until the upper end of the rod body is embedded into a moving groove to support the drying plate, at the moment, a first notch of the first drying device is matched with a second notch of the second drying device, and the rod body is connected and fixed through a connecting magnet, at the moment, drying areas of the drying plates on the first drying device and the second drying device are just connected, no supporting force is applied to the first drying device and the second drying device, the first drying device and the second drying device are downward under the action of gravity until the lower end of the drying device supporting plate is contacted with a workbench to support, at the moment, the drying plate connected on the first drying device and the second drying device is just positioned at the upper end of the printed circuit board, the whole area of the drying area is just positioned at the upper end of the printed circuit board and is close to the upper end of the printed circuit board, so that the printed circuit board is dried in a centralized effect, all the structures are matched, heat is finally centralized at the position of the printed circuit board, and the drying efficiency is increased;

2. in the invention, when the optical alignment camera detects a slight deviation of the position, the first rotating member is rotated relatively by the rotation of the first motor, because the first rotating teeth on the first rotating member are engaged with the first horizontal teeth on the printing jig, so that the printing jig moves horizontally relative to the movable support plate, and the first rotating teeth on the first rotating member and the first horizontal teeth on the printing jig have smaller teeth, so that the printing jig has a small value of horizontal movement relative to the movable supporting plate, thereby ensuring the moving precision, the second motor drives the second rotating part to rotate in the longitudinal plane, so that the movable supporting plate longitudinally moves relative to the upper end surface of the workbench until the detection center point of the optical alignment camera is aligned with the alignment point on the printing jig, when the position is correct, the printed circuit board is placed in, and the matching alignment of the printed circuit board and the patterns on the silk screen can be kept;

3. according to the invention, after the silk screen and the frame are contacted with the printed circuit board and the printing jig, as the friction force between the upper friction gasket of the frame and the lower friction gasket of the printing jig is increased compared with the plane contact, after the alignment is completed and the silk screen and the frame move downwards to start printing, the positions of the silk screen and the frame, the printed circuit board and the printing jig are kept relatively still, and the printing precision is ensured;

4. compared with the traditional mode that the driving gear and the driven gear are respectively arranged on two sides, the scraper is moved by placing the driving member of the driving gear at the middle position, so that the equal weight of the positions on the two sides can be ensured, the condition that one side is heavier and inclined can not occur, and the problem that printing is deviated after optical alignment can be avoided.

Drawings

FIG. 1 is a front view of a circuit board printing apparatus of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of the present invention;

FIG. 3 is an enlarged view of the invention at B;

FIG. 4 is an internal structural view of the outer case of the present invention;

fig. 5 is an overall structural view of the first drying device of the present invention;

FIG. 6 is a bottom view of the drying plate of the present invention;

fig. 7 is an overall structural view of a second drying apparatus of the present invention;

fig. 8 is a connection relationship diagram of a support plate and an outer frame of the drying device of the present invention.

In the figure: 1. a work table; 2. connecting a bracket; 3. an electric telescopic mechanism; 4. driving the telescopic rod; 5. an outer housing; 6. a wire mesh; 7. a frame; 8. an optical alignment camera; 9. a limiting rod; 10. a limiting column; 11. a printed circuit board; 12. printing a jig; 13. moving the support plate; 14. a first drying device; 15. a first motor; 16. a second motor; 17. a limiting groove; 18. an upper friction pad; 19. a lower friction pad; 20. a first horizontal tooth; 21. a first rotating member; 22. a first rotating tooth; 23. a second longitudinal tooth; 24. a second rotating member; 25. a scraper; 26. a drive gear; 27. a driven gear; 28. a drive belt; 29. a second drying device; 30. an outer frame; 31. a placing groove; 32. a slide bar; 33. connecting a telescopic rod; 34. drying the plate; 35. a first notch; 36. a moving groove; 37. connecting the magnet; 38. a drying zone; 39. a second notch; 40. a drying device support plate; 41. a pressure 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.

Referring to fig. 1-8, an embodiment of the present invention: a circuit board printing device comprises a workbench 1, a first drying device 14 is arranged in the middle of the rear end of the upper end face of the workbench 1, a second drying device 29 is arranged in the middle of the front end of the upper end face of the workbench 1, the first drying device 14 and the second drying device 29 are connected with the workbench 1 through a slide bar 32, the slide bar 32 can be replaced by a conventional electric control guide rail, so that the slide bar can be automatically operated, if the electric control guide rail is the electric control guide rail, the electric control guide rail needs to be installed in a front direction, a space is reserved for placing a drying device support plate 40, the first drying device 14 and the second drying device 29 are both embedded into the workbench 1 and are normally hidden, the first drying device 14 and the second drying device 29 respectively comprise an outer frame 30, a placing groove 31, a connecting telescopic rod 33, a drying plate 34, a moving groove 36, a drying area 38, a drying device support plate 40 and a pressure spring 41, the placing groove 31 is positioned in the middle of the outer frame, the connecting telescopic rod 33 is located at two sides of the inner part, the connecting telescopic rod 33 is rotatably connected with the outer frame 30 through a mounting part, the connecting telescopic rod 33 comprises a rod body and a sleeve, the rod body is connected with the sleeve through a thread, a support piece is arranged at the upper end of the rod body, the drying plate 34 is located at one side of the outer frame 30, the drying plate 34 is rotatably connected with the outer frame 30 through a rotating shaft, the size of the drying plate 34 is the same as that of the placing groove 31, the thickness of the drying plate 34 is smaller than the depth of the placing groove 31, the moving groove 36 is located at one end of the drying plate 34 at two sides of the lower end face, the diameter of the support piece is smaller than the width of the moving groove 36, the drying area 38 is located at one end of the drying plate 34 at the middle of the lower end face, heating wires are arranged in the drying area 38, the drying device, the rotating shaft of the drying device supporting plate 40 connected with the outer frame 30 and the rotating shaft of the drying plate 34 connected with the outer frame 30 adopt electric control rotating shafts, so that automatic operation is realized, the drying device supporting plate 40 is embedded in the outer frame 30, the pressure spring 41 is positioned between the outer frame 30 and the drying device supporting plate 40, the pressure spring 41 is connected with the lower end of one side of the drying device supporting plate 40, one side of the drying plate 34 on the first drying device 14 is provided with a first notch 35, one side of the drying plate 34 on the second drying device 29 is provided with a second notch 39, the second notch 39 is matched with the first notch 35, the middle of the lower end surface of the first notch 35 and the middle of the upper end surface of the second notch 39 are both provided with a connecting magnet 37, the suction force for connecting the magnet 37 does not need to be too large and only plays a role of connection, the drying plate 34 on the first drying device 14 is connected with the drying plate 34 on the second drying device 29 through the, and the drying section 38 of the first drying device 14 is connected with the drying section 38 of the second drying device 29.

Further, a movable support plate 13 is arranged in the middle of the upper end of the workbench 1, a printing jig 12 is arranged at the upper end of the movable support plate 13, first horizontal teeth 20 are arranged on two sides of the lower end of the printing jig 12, first rotating members 21 are arranged on two sides of the upper end of the movable support plate 13, the first rotating members 21 are embedded in the movable support plate 13 and are rotatably connected with the movable support plate 13, each first rotating member 21 comprises a first rotating tooth 22 and a smooth arc surface, the maximum rotating distance of the first rotating member 21 is determined by the number of teeth of the first rotating teeth 22, when the maximum rotating distance exceeds the maximum rotating distance, the position of the printing jig 12 cannot be influenced by the continuous rotation of the first rotating member 21, the first rotating teeth 22 cannot continuously rotate downwards when contacting with the movable support plate 13, the first rotating teeth 22 are meshed with the first horizontal teeth 20, a first motor 15 is arranged at the rear end of the first rotating member 21, the lower end of the second longitudinal tooth 23 is provided with a second rotating member 24, and the second rotating member 24 comprises a second rotating tooth, the second rotating tooth is meshed with the second longitudinal tooth 23, one side of the second rotating member 24 is provided with a second motor 16, and the first rotating member 21, the first horizontal tooth 20 and the first motor 15 are perpendicular to the arrangement direction of the second rotating member 24, the second longitudinal tooth 23 and the second motor 16.

The counterpoint adjusts relevant structure and current difference, realizes the relative regulation of four directions through the meshing relation of tooth, though there is not the direct connection relation, after targetting in place, the meshing relation of tooth can guarantee that the upper end structure can not carry out corresponding removal in the horizontal plane to guarantee to counterpoint the effect.

Further, the upper end of the printing jig 12 is provided with a frame 7, a screen 6 is arranged inside the frame 7, the screen 6 adopts a large mesh number and is tightened in the frame 7, a lower friction gasket 19 is arranged on the periphery of the upper end face of the printing jig 12, an upper friction gasket 18 is arranged on the periphery of the lower end face of the frame 7, friction patterns are arranged on the upper friction gasket 18 and the lower friction gasket 19, the size of the lower friction gasket 19 is the same as that of the upper friction gasket 18, and in order to increase friction force, the lower friction gasket and the upper friction gasket do not move relatively during alignment printing.

Further, the upper end of frame 7 is provided with shell body 5, and shell body 5 passes through the connecting block with frame 7 and is connected, frame 7 passes through the turn-up bolt fastening with the connecting block, or other fixed mode also can, as long as can dismantle can, drive gear 26 is installed to the inside centre of shell body 5, install servo motor behind the drive gear 26, driven gear 27 is installed to the inside both sides of shell body 5, driven gear 27 and drive gear 26 install driving band 28 in the outside, and driving band 28 and driven gear 27 and drive gear 26 mesh, the lower extreme of driving band 28 is provided with scraper 25, and scraper 25 is fixed with driving band 28, shell body 5 is seted up slottedly in the centre of terminal surface down.

Further, optics are counterpointed camera 8 to four edges of shell body 5 lower extreme inboard, directly adopt some optics to counterpoint camera 8 on the market, carry out optics and counterpoint the back printing and can guarantee printing precision and printing effect, and optics are counterpointed camera 8 and are set up in the outside at groove.

Furthermore, four corners of the outer side of the lower end of the outer shell 5 are provided with limiting rods 9, the lower end of each limiting rod 9 is provided with a limiting column 10, the limiting rods 9 are connected with the limiting columns 10 in an embedded mode, and the limiting columns 10 are fixed with the workbench 1.

Further, the middle of the upper end face of the printing jig 12 is provided with a limiting groove 17, four corners of the lower bottom face of the limiting groove 17 are provided with aligning points, a printed circuit board 11 is arranged inside the limiting groove 17, and the height of the printed circuit board 11 is larger than that of the limiting groove 17.

Further, both sides of the upper end of the workbench 1 are provided with connecting supports 2, the connecting supports 2 are fixedly welded with the workbench 1, an electric telescopic mechanism 3 is installed in the middle of the upper end of the connecting supports 2, and the electric telescopic mechanism 3 comprises a driving telescopic rod 4.

The front end and the rear end inside the workbench 1 are hidden with the first drying device 14 and the second drying device 29, the front end of the workbench 1 can be provided with a controller, part of components are replaced by electric control components according to the specific embodiment, a circuit is connected with a control branch of the controller, and the controller controls the circuit connection of each branch, so that the opening and closing of each component are controlled, and the automatic control of the device is realized.

The working principle is as follows: when the optical alignment device is used, optical alignment is carried out through the optical alignment camera 8, when the direction of the central point of the optical alignment camera 8 and alignment points arranged at four corners in the limiting groove 17 of the printing jig 12 have horizontal direction deviation, the first motor 15 rotates to enable the first rotating piece 21 to rotate relatively, and the first rotating teeth 22 on the first rotating piece 21 are meshed with the first horizontal teeth 20 on the printing jig 12, so that the printing jig 12 moves horizontally relative to the movable supporting plate 13, and the first rotating teeth 22 on the first rotating piece 21 and the teeth of the first horizontal teeth 20 on the printing jig 12 are smaller, so that the numerical value of the horizontal movement of the printing jig 12 relative to the movable supporting plate 13 is smaller, and the horizontal in-place effect is ensured; when the direction of the central point of the optical alignment camera 8 has a longitudinal direction deviation with the alignment points arranged at four corners in the limiting groove 17 of the printing jig 12, the second motor 16 drives the second rotating member 24 to rotate, so that the movable supporting plate 13 has a longitudinal relative movement with respect to the upper end surface of the workbench 1 until the optical alignment camera 8 detects the central point and the alignment point on the printing jig 12 is aligned, the position is correct, and then the printed circuit board 11 is put in, so as to keep the position of the printed circuit board 11 aligned with the position of the silk screen 6. Through the work of the electric telescopic mechanism 3, the driving telescopic rod 4 extends downwards to drive the outer shell 5 to move downwards, the silk screen 6 and the frame 7 are pressed at the position of the printed circuit board 11, photosensitive ink or other printing materials are poured into the position of the upper end face of the silk screen 6 through a discharge pipe of an external discharging device, a motor arranged behind the driving gear 26 is driven to rotate the driving belt 28, so that the scraper 25 screeds the printing materials, the printing materials are waited for a moment after being printed, after the surfaces of the printing materials are not adhered, the electric telescopic mechanism 3 works to drive the telescopic rod 4 to contract, the silk screen 6 is far away from the printed circuit board 11, the first drying device 14 and the second drying device 29 are lifted, under the resilience force of the pressure spring 41, the drying device supporting plate 40 is popped up, the drying plate 34 is pulled open, the connecting telescopic rod 33 is rotated out, and the rod body connected with, until the upper end of the rod body is embedded into the moving groove 36 to support the drying plate 34 (at this time, the rod body is embedded into the moving groove 36 to be connected to form a triangular structure, the gravity of the drying plate 34 presses the connecting telescopic rod 33 so as to be stably connected), at this time, the first notch 35 of the first drying device 14 is matched with the second notch 39 of the second drying device 29 in a state, the first notch 35 and the second notch 39 are connected and fixed through the connecting magnet 37, at this time, the drying area 38 of the drying plate 34 on the first drying device 14 and the second drying device 29 are just connected, then, no supporting force is applied to the first drying device 14 and the second drying device 29, the first drying device 14 and the second drying device 29 are downward along with the action of the gravity until the lower end of the drying device supporting plate 40 is contacted with the workbench 1 to support, at this time, the drying plate 34 connected on the first drying device 14 and the second drying device 29 is just, the whole area of the drying section 38 is located just above the upper end of the printed circuit board 11 and is located in a short distance, so that the heating heat of the drying section 38 is concentrated on the upper end of the printed circuit board 11, thereby performing rapid drying.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A circuit board printing apparatus comprising a table (1), characterized in that: the middle of the rear end of the upper end face of the workbench (1) is provided with a first drying device (14), the middle of the front end of the upper end face of the workbench (1) is provided with a second drying device (29), the first drying device (14) and the second drying device (29) are connected with the workbench (1) through a sliding strip (32), the first drying device (14) and the second drying device (29) are embedded into the workbench (1), the first drying device (14) and the second drying device (29) respectively comprise an outer frame (30), a placing groove (31), a connecting telescopic rod (33), a drying plate (34), a moving groove (36), a drying area (38), a drying device supporting plate (40) and a pressure spring (41), the placing groove (31) is positioned in the middle of the outer frame (30), the connecting telescopic rods (33) are positioned on two sides of the inner portion, and the connecting telescopic rods (33) are rotatably connected with the outer frame (30) through mounting pieces, the connecting telescopic rod (33) comprises a rod body and a sleeve, the rod body is connected with the sleeve through threads, a supporting sheet is arranged at the upper end of the rod body, a drying plate (34) is positioned at one side of an outer frame (30), the drying plate (34) is rotatably connected with the outer frame (30) through a rotating shaft, the size of the drying plate (34) is the same as that of the placement groove (31), the thickness of the drying plate (34) is smaller than the depth of the placement groove (31), a moving groove (36) is positioned at one end of two sides of the lower end surface of the drying plate (34), the diameter of the supporting sheet is smaller than that of the moving groove (36), a drying area (38) is positioned at one end of the middle of the lower end surface of the drying plate (34), an electric heating wire is arranged in the drying area (38), a drying device supporting plate (40) is positioned in the middle of one side of the outer frame (30), the drying device supporting plate (40) is rotatably connected with the outer frame, the pressure spring (41) is positioned between the outer frame (30) and the drying device support plate (40), and the pressure spring (41) is connected with the lower end of one side of the drying device supporting plate (40), a first notch (35) is arranged on one side of the drying plate (34) on the first drying device (14), a second notch (39) is arranged on one side of the drying plate (34) on the second drying device (29), the second notch (39) is matched with the first notch (35), the middle of the lower end surface of the first notch (35) and the middle of the upper end surface of the second notch (39) are provided with a connecting magnet (37), the drying plate (34) on the first drying device (14) is connected with the drying plate (34) on the second drying device (29) through a connecting magnet (37), and the drying area (38) on the first drying device (14) is connected with the drying area (38) on the second drying device (29).

2. A circuit board printing apparatus as defined in claim 1, wherein: a movable supporting plate (13) is arranged in the middle of the upper end of the workbench (1), a printing jig (12) is arranged at the upper end of the movable supporting plate (13), first horizontal teeth (20) are arranged on two sides of the lower end of the printing jig (12), first rotating members (21) are installed on two sides of the upper end of the movable supporting plate (13), the first rotating members (21) are embedded into the movable supporting plate (13) and are rotatably connected with the movable supporting plate (13), each first rotating member (21) comprises first rotating teeth (22) and a smooth cambered surface, the first rotating teeth (22) are meshed with the first horizontal teeth (20), a first motor (15) is installed at the rear end of each first rotating member (21), second longitudinal teeth (23) are arranged at the front end and the rear end of the lower end of the movable supporting plate (13), and second rotating members (24) are arranged at the lower ends of the second longitudinal teeth (23), and the second rotating piece (24) comprises a second rotating tooth, the second rotating tooth is meshed with the second longitudinal tooth (23), a second motor (16) is installed on one side of the second rotating piece (24), and the first rotating piece (21), the first horizontal tooth (20) and the first motor (15) are perpendicular to the arrangement directions of the second rotating piece (24), the second longitudinal tooth (23) and the second motor (16).

3. A circuit board printing apparatus as defined in claim 2, wherein: the upper end of the printing jig (12) is provided with a frame (7), a silk screen (6) is arranged inside the frame (7), a lower friction gasket (19) is arranged on the periphery of the upper end face of the printing jig (12), an upper friction gasket (18) is arranged on the periphery of the lower end face of the frame (7), friction patterns are arranged on the upper friction gasket (18) and the lower friction gasket (19), and the size of the lower friction gasket (19) is the same as that of the upper friction gasket (18).

4. A circuit board printing apparatus as defined in claim 3, wherein: the upper end of frame (7) is provided with shell body (5), and shell body (5) is connected through the connecting block with frame (7), and frame (7) and connecting block are through the turn-up bolt fastening, drive gear (26) are installed to the inside centre of shell body (5), driven gear (27) are installed to the inside both sides of shell body (5), driving band (28) are installed in driven gear (27) and drive gear (26) outside, and driving band (28) and driven gear (27) and drive gear (26) meshing, the lower extreme of driving band (28) is provided with scraper (25), and scraper (25) are fixed with driving band (28), and shell body (5) lower terminal surface's centre is seted up slottedly.

5. A circuit board printing apparatus as defined in claim 4, wherein: four corners of the inner side of the lower end of the outer shell (5) are provided with optical alignment cameras (8), and the optical alignment cameras (8) are arranged on the outer side of the groove.

6. A circuit board printing apparatus as defined in claim 4, wherein: four edges outside the lower end of the outer shell (5) are provided with limiting rods (9), the lower end of each limiting rod (9) is provided with a limiting column (10), the limiting rods (9) are connected with the limiting columns (10) in an embedded mode, and the limiting columns (10) are fixed with the workbench (1).

7. A circuit board printing apparatus as defined in claim 2, wherein: the middle of the upper end face of the printing jig (12) is provided with a limiting groove (17), four corners of the lower bottom face of the limiting groove (17) are provided with aligning points, a printed circuit board (11) is arranged inside the limiting groove (17), and the height of the printed circuit board (11) is larger than that of the limiting groove (17).

8. A circuit board printing apparatus as defined in claim 1, wherein: the utility model discloses a worktable for the automobile engine, including workstation (1), connecting support (2), and connecting support (2) and workstation (1) welded fastening, electronic telescopic machanism (3) are installed to the centre of connecting support (2) upper end, electronic telescopic machanism (3) are including drive telescopic link (4).