CN114523759B

CN114523759B - Pressure regulating and locking device of screen printer

Info

Publication number: CN114523759B
Application number: CN202210177417.XA
Authority: CN
Inventors: 唐军
Original assignee: Dianchi College of Yunnan University
Current assignee: Dianchi College of Yunnan University
Priority date: 2022-02-25
Filing date: 2022-02-25
Publication date: 2023-05-16
Anticipated expiration: 2042-02-25
Also published as: CN114523759A

Abstract

The invention discloses a pressure regulating and anti-loose device of a screen printer, which comprises a base; the two transmission grooves are fixed on the base in parallel; the bracket is fixed above the base; the ink brush is arranged in the bracket in a servo transverse sliding manner and is connected with the bracket in a lifting manner through an ink brush lifting cylinder; the two ends of the net rack are connected with the bracket in a lifting manner through net rack lifting cylinders, and net clamps capable of clamping silk screens through the clamping cylinders are arranged at the two ends of the net rack; the transmission rope is wound on the upper surface and the lower surface of the transmission groove in an annular mode, and two ends of the transmission rope are sleeved in the transmission shaft. Compared with the prior art, the screen mesh is attached to the printed matter in a buffering way, no reaction force is generated, the attachment is stable, abrasion and indentation between the screen mesh and the printed matter can be reduced, in the printing process, the guide wheel for the height of the positioner, the mutually pressed net frame and the limiting plate are arranged outside the plane of the screen mesh and the printed matter, and all areas of the printed matter can be ensured to be brushed by ink.

Description

Pressure regulating and locking device of screen printer

Technical Field

The invention relates to the technical field of printing equipment, in particular to a pressure regulating and locking device of a screen printer.

Background

The screen printer is a machine using a screen plate Shi Yin, which belongs to a representative printing device in a stencil printer, and performs printing by using the basic principle that the mesh of the image-text part of the screen plate can be penetrated by ink and the mesh of the non-image-text part can not be penetrated by ink. The quality of screen printing is closely related to the laminating precision of a screen and a printed matter, ink is easy to seep from a gap when the gap between the screen and the printed matter is large, burrs are easy to be caused, pressure between the screen and the printed matter is too large to generate indentation, the screen is easy to deform to cause pattern deformation, the screen and the printed matter are laminated through elastic buffering in the prior art, the more compact and reactive force is larger, the screen deformation is easy to be caused, in addition, the thickness of the plate-shaped printed matter is inconsistent, the thickness of the printed matter cannot be fed back to the stroke of the screen, errors are easy to be caused, in addition, the existing screen compacting, positioning and other devices need to be laminated to the screen, and the printing area is required to be smaller than the area of the printed matter in order to prevent the obstruction to the printing process.

Therefore, it is necessary to provide a pressure-regulating and anti-loosening device for a screen printer to solve the problems in the prior art.

Disclosure of Invention

In order to achieve the above purpose, the present invention provides the following technical solutions: a pressure regulating and anti-loose device of a screen printer comprises a base; the two transmission grooves are fixed on the base in parallel; the bracket is fixed above the base; the ink brush is arranged in the bracket in a servo transverse sliding manner and is connected with the bracket in a lifting manner through an ink brush lifting cylinder; the two ends of the net rack are connected with the bracket in a lifting manner through net rack lifting cylinders, and net clamps capable of clamping silk screens through the clamping cylinders are arranged at the two ends of the net rack; the transmission ropes are annularly wound on the upper surface and the lower surface of the transmission groove, two ends of each transmission rope are sleeved in the transmission shafts, one transmission shaft can be driven to rotate by a motor, and the upper end face of each transmission rope is higher than the upper end face of the transmission groove; the lower parts of the two sides of the net rack are provided with limiting plates which can limit the descending height of the net rack, the height of limiting plate is adjusted through the leading wheel that sets up at the transmission groove input, just the height of limiting plate can be through locking subassembly locking.

Further, as the preference, be fixed with under the both sides of rack and support the gasbag, support gasbag and limiting plate on same vertical plane, the limiting plate top is equipped with the relief valve, just support the relevant position of gasbag below and have the relief vent.

Further, preferably, a positioning wheel is arranged in a position, close to the output end of the transmission groove, on the base between the two transmission grooves, and the positioning wheel is arranged above the base in a servo lifting manner;

and a bottom supporting plate capable of being lifted in a servo manner is arranged on the base between the two transmission grooves.

Further, as an optimization, the guide wheels are respectively arranged at the input ends of the two transmission grooves and are positioned outside the plane where the net rack is positioned and in the two transmission grooves;

the guide wheel is rotatably connected with the sliding table, the sliding table is connected with the base in a vertical sliding manner through the guide rail, and the sliding table can drive the limiting plate to move up and down.

Further, as an optimization, the limiting plate is connected with the base in a manner of moving up and down through the guide shaft, eccentric wheels are rotatably arranged at the positions, close to the two ends of the limiting plate, of the base corresponding to the limiting plate, and the eccentric wheels are attached to the limiting plate.

Further, preferably, the same position of the two eccentric wheels is hinged by a connecting rod, so that the two eccentric wheels synchronously rotate.

Further, preferably, a return spring is sleeved outside the guide shaft between the limiting plate and the base, and the return spring provides force for enabling the limiting plate to move downwards.

Further, preferably, a gear is rotatably arranged in the locking assembly, a rotating shaft is fixed in the center of the gear, and the rotating shaft is fixed in the rotating shaft of the eccentric wheel corresponding to the rotating shaft;

the locking assembly is internally provided with a rack in a vertical sliding manner, the rack is meshed with the gear, and the upper end of the rack is fixed in the sliding table.

Further, as preferable, a concave ratchet groove is formed in the center of one surface, far away from the rotating shaft, of the gear, a plurality of ratchets are distributed on the inner circumference of the ratchet groove, and one end of each ratchet is rotatably connected with the locking component shell;

when the ratchet rotates to be in contact with the inner wall of the ratchet groove, the rotation of the gear in the direction of downward movement of the guide wheel can be restricted.

Further, preferably, a torsion spring is arranged in the rotating shaft of the ratchet, the torsion spring provides force for enabling the ratchet to be attached to the ratchet groove, an electromagnet is fixed between the ratchet teeth, and the electromagnet provides adsorption force for enabling the ratchet to be separated from the ratchet groove when the electromagnet is electrified.

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

according to the invention, the supporting air bag is connected to the external air pump, that is, when the inflated supporting air bag moves downwards to be inserted into the pressure relief valve, the air pressure in the supporting air bag overflows from the pressure relief valve, so that the net rack is attached to the limiting plate, the silk screen is attached to the printed matter in a buffering manner, no reaction force is generated, the supporting air bag is stable after attachment, and abrasion and indentation between the silk screen and the printed matter can be reduced.

According to the invention, when a printed matter passes through the guide wheel above the transmission groove, the guide wheel is attached to the upper side of the transmission groove, so that the guide wheel is driven to ascend, and when the sliding table moves up and down along with the guide wheel, the rack drives the gear to rotate, so that the eccentric wheel is driven to rotate to change the angle, the limiting plate moves up and down, the moving distance of the sliding table is the same as the moving distance of the limiting plate, and the height of the limiting plate is changed, so that the down-pressure height of the net rack is adjusted;

and after the printed matter leaves the guide wheel, the guide wheel is left in situ under the action of the locking assembly, and in the printing process, the guide wheel for the height of the positioner, the grid frame pressed mutually and the limiting plate are positioned outside the plane where the silk screen and the printed matter are positioned, so that all areas of the printed matter can be brushed by ink.

Drawings

Fig. 1 is a schematic view of a structure of a pressure-regulating and anti-loose device of a screen printer;

FIG. 2 is a schematic structural view of a guide wheel;

FIG. 3 is a schematic structural view of a limiting plate;

FIG. 4 is a schematic view of the structure of the locking assembly;

in the figure: 1. a base; 2. a transmission groove; 21. a bottom support plate; 22. a positioning wheel; 3. a bracket; 4. an ink brush; 41. an ink brush lifting cylinder; 5. a net rack; 51. a net clip; 52. a clamping cylinder; 53. a net rack lifting cylinder; 6. a transmission rope; 61. a transmission shaft; 7. a guide wheel; 71. a sliding table; 72. a guide rail; 8. a locking assembly; 81. a rotating shaft; 82. a gear; 83. ratchet grooves; 84. a ratchet; 85. an electromagnet; 86. a rack; 9. a limiting plate; 91. an eccentric wheel; 92. a guide shaft; 93. a connecting rod; 94. a pressure release valve; 95. a return spring; 10. supporting the air bag.

Detailed Description

Referring to fig. 1, in an embodiment of the present invention, a pressure-regulating and anti-loosening device for a screen printer includes,

a base 1;

the two transmission grooves 2 are fixed on the base 1 in parallel;

the bracket 3 is fixed above the base 1;

the ink brush 4 is arranged in the bracket 3 in a servo transverse sliding manner and is connected with the bracket 3 in a lifting manner through the ink brush lifting cylinder 41;

the two ends of the net rack 5 are connected with the bracket 3 in a lifting way through net rack lifting cylinders 53, and net clamps 51 capable of clamping silk screens by clamping cylinders 52 are arranged at the two ends of the net rack 5;

the transmission ropes 6 are annularly wound on the upper surface and the lower surface of the transmission groove 2, two ends of each transmission rope are sleeved in the transmission shafts 61, one transmission shaft 61 can be driven to rotate by a motor, and the upper end face of each transmission rope 6 is higher than the upper end face of the transmission groove 2;

the conveying ropes 6 can be driven by the conveying shafts 61 to move in a ring shape in the conveying groove 2, and when the plate-shaped printed matter is placed on the two conveying ropes 6, the conveying ropes 6 can drive the plate-shaped printed matter to move;

the lower parts of the two sides of the net rack 5 are provided with limiting plates 9 capable of limiting the descending height of the net rack 5, the height of the limiting plates 9 is adjusted through guide wheels 7 arranged at the input end of the transmission groove 2, and the height of the limiting plates 9 can be locked through locking assemblies 8;

in this embodiment, support air bags 10 are fixed under two sides of the grid 5, the support air bags 10 and the limiting plates 9 are on the same vertical plane, a pressure release valve 94 is arranged above the limiting plates 9, and pressure release openings are arranged at corresponding positions below the support air bags 10;

the support airbag 10 is connected to an external air pump, that is, when the inflated support airbag 10 moves down to be inserted into the relief valve 94, the air pressure therein overflows from the relief valve 94, so that the net frame 5 is slowly approaching the limiting plate 9.

In this embodiment, a positioning wheel 22 is disposed in a position on the base 1 between the two transmission grooves 2, which is close to the output end of the transmission groove 2, and the positioning wheel 22 is disposed above the base 1 in a servo lifting manner;

the positioning wheel 22 is located above the upper surface of the conveying groove 2 when ascending to limit the transverse displacement of the printed matter, and is located below the upper surface of the conveying groove 2 when descending, so that the movement of the printed matter is not hindered.

In this embodiment, a bottom support plate 21 capable of being lifted and lowered in a servo manner is provided on the base 1 between the two transmission tanks 2;

the positioning wheel 22 is flush with the upper surface of the conveying trough 2 when ascending to provide support for the bottom of the printed matter, and is positioned below the upper surface of the conveying trough 2 when descending, so as not to obstruct the movement of the printed matter.

Referring to fig. 2, in this embodiment, the guide wheels 7 are respectively disposed at the input ends of the two conveying tanks 2 and are located outside the plane of the grid 5 and in the two conveying tanks 2;

the guide wheel 7 is rotatably connected with the sliding table 71, the sliding table 71 is connected with the base 1 in a manner of up-and-down sliding through the guide rail 72, and the sliding table 71 can drive the limiting plate 9 to move up and down;

that is, when the printed matter passes through the guide wheel 7 above the conveying groove 2, the guide wheel 7 is attached to the upper side of the conveying groove, so that the guide wheel 7 is driven to rise, the height of the limiting plate 9 is changed, and the descending height of the net rack 5 is adjusted.

Referring to fig. 3, in the embodiment, the limiting plate 9 is movably connected with the base 1 up and down through a guiding shaft 92, eccentric wheels 91 are rotatably arranged at two ends of the base 1, which are close to the limiting plate 9, corresponding to the limiting plate 9, and the eccentric wheels 91 are attached to the limiting plate 9;

when the eccentric 91 rotates to different angles, the limiting plate 9 rises to different heights as a result.

In this embodiment, the same position of the two eccentric wheels 91 is hinged by a connecting rod 93, so that the two eccentric wheels rotate synchronously;

a return spring 95 is sleeved outside the guide shaft 92 between the limiting plate 9 and the base 1, and the return spring 95 provides force for downwards moving the limiting plate 9.

Referring to fig. 4, in the present embodiment, a gear 82 is rotatably disposed in the locking assembly 8, a rotation shaft 81 is fixed at the center of the gear 82, and the rotation shaft 81 is fixed in the rotation shaft of the eccentric 91 corresponding to the rotation shaft;

a rack 86 is arranged in the locking assembly 8 in a vertically sliding way, the rack 86 is meshed with the gear 82, and the upper end of the rack 86 is fixed in the sliding table 71;

that is, when the slide table 71 moves up and down with the guide wheel 7, the rack 86 drives the gear 82 to rotate, thereby driving the eccentric wheel 91 to rotate to change the angle so that the limit plate 9 moves up and down, and the moving distance of the slide table 71 is the same as the moving distance of the limit plate 9.

In this embodiment, a concave ratchet groove 83 is formed in the center of the surface of the gear 82 away from the rotating shaft 81, a plurality of ratchets 84 are distributed on the inner circumference of the ratchet groove 83, and one end of each ratchet 84 is rotatably connected with the housing of the locking assembly 8;

when the ratchet teeth 84 are rotated to be engaged with the inner wall of the ratchet grooves 83, the rotation of the gear 82 in the direction of moving the guide wheel 7 downward can be restricted.

In this embodiment, a torsion spring is disposed in the rotating shaft of the ratchet teeth 84, the torsion spring provides a force for making the ratchet teeth 84 fit the ratchet grooves 83, an electromagnet 85 is fixed between the ratchet teeth 84, and the electromagnet 85 provides an adsorption force for making the ratchet teeth 84 separate from the ratchet grooves 83 when being electrified;

when the electromagnet 85 is electrified, the ratchet 84 loses the locking effect on the gear 82, and the limiting plate 9 and the guide wheel 7 can move downwards to the initial position under the elasticity of the return spring 95.

In the concrete implementation, firstly, the silk screen is fixed in the net rack 5 through the clamping action of the net clamp 51;

placing plate-shaped printed matters on the two conveying grooves 2, driving the printed matters to move forwards by the conveying ropes 6, jacking the guide wheels 7 to the height same as the thickness of the guide wheels in the moving process, and driving the eccentric wheels 91 to move upwards by the gears 82;

after the printed matter leaves the guide wheel 7, the guide wheel 7 is left in place under the action of the locking component 8;

after the printed matter is propped against the positioning wheel 22, the conveying rope 6 stops moving, and the bottom supporting plate 21 rises to support the bottom of the printed matter;

after the supporting air bag 10 is inflated, the net frame 5 moves downwards to enable the supporting air bag 10 to be attached to the limiting plate 9, the supporting air bag 10 is completely attached to the supporting air bag after the air is discharged through the pressure release valve 94, and meanwhile, the silk screen and the printed matter are gently attached together;

the ink brush 4 is used for spraying ink on the silk screen and the printed matter and uniformly coating, and a silk screen printing process is carried out;

after the support airbag 10 is inflated again to slightly separate from the limiting plate 9, the net rack 5 continues to move upwards to the initial position;

the electromagnet 85 is electrified to lose the locking effect on the gear 82, and the limiting plate 9 and the guide wheel 7 can return to the initial position under the elasticity of the return spring 95;

the bottom support plate 21 and the positioning wheel 22 move downwards to a yielding position and the transport line 6 drives the printed product out of the transport chute 2.

The foregoing description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims

1. A pressure regulating and anti-loose device of a screen printer is characterized by comprising,

a base (1);

the two transmission grooves (2) are parallelly fixed on the base (1);

the bracket (3) is fixed above the base (1);

the ink brush (4) is arranged in the bracket (3) in a servo transverse sliding manner and is connected with the bracket (3) in a lifting manner through an ink brush lifting cylinder (41);

the two ends of the net rack (5) are connected with the bracket (3) in a lifting manner through net rack lifting cylinders (53), and net clamps (51) capable of clamping the silk screen by the clamping cylinders (52) are arranged at the two ends of the net rack (5);

the transmission ropes (6) are annularly wound on the upper surface and the lower surface of the transmission groove (2), two ends of each transmission rope are sleeved in the transmission shafts (61), one transmission shaft (61) can be driven by a motor to rotate, and the upper end face of each transmission rope (6) is higher than the upper end face of the transmission groove (2);

the utility model is characterized in that the lower parts of the two sides of the net rack (5) are provided with limiting plates (9) capable of limiting the descending height of the net rack (5), the height of the limiting plates (9) is adjusted through guide wheels (7) arranged at the input end of the transmission groove (2), and the height of the limiting plates (9) can be locked through locking components (8);

support air bags (10) are fixed under two sides of the net rack (5), the support air bags (10) and the limiting plates (9) are arranged on the same vertical plane, pressure release valves (94) are arranged above the limiting plates (9), and pressure release openings are arranged at corresponding positions under the support air bags (10);

a positioning wheel (22) is arranged in a position, close to the output end of the transmission groove (2), on the base (1) between the two transmission grooves (2), and the positioning wheel (22) can be arranged above the base (1) in a servo lifting manner;

a bottom supporting plate (21) which can be lifted in a servo way is arranged on the base (1) between the two transmission grooves (2);

the guide wheels (7) are respectively arranged at the input ends of the two transmission grooves (2) and are positioned outside the plane where the net rack (5) is positioned and in the two transmission grooves (2);

the guide wheel (7) is rotatably connected with the sliding table (71), the sliding table (71) is connected with the base (1) in a vertically sliding manner through the guide rail (72), and the sliding table (71) can drive the limiting plate (9) to move up and down;

the limiting plate (9) is connected with the base (1) in a vertically movable manner through a guide shaft (92), eccentric wheels (91) are rotatably arranged at the two ends, close to the limiting plate (9), of the base (1) corresponding to the limiting plate (9), and the eccentric wheels (91) are attached to the limiting plate (9);

the same positions of the two eccentric wheels (91) are hinged through a connecting rod (93) so that the two eccentric wheels synchronously rotate;

a return spring (95) is sleeved outside a guide shaft (92) between the limiting plate (9) and the base (1), and the return spring (95) provides force for enabling the limiting plate (9) to move downwards.

2. The pressure regulating and anti-loosening device of a screen printer according to claim 1, wherein a gear (82) is rotatably arranged in the locking assembly (8), a rotating shaft (81) is fixed at the center of the gear (82), and the rotating shaft (81) is fixed in the rotating shaft of an eccentric wheel (91) corresponding to the rotating shaft;

a rack (86) is arranged in the locking assembly (8) in a vertical sliding mode, the rack (86) is meshed with the gear (82), and the upper end of the rack (86) is fixed into the sliding table (71).

3. The pressure regulating and anti-loosening device of the screen printer according to claim 2, wherein a concave ratchet groove (83) is formed in the center of one surface of the gear (82) far away from the rotating shaft (81), a plurality of ratchets (84) are distributed on the inner circumference of the ratchet groove (83), and one end of each ratchet (84) is rotatably connected with the shell of the locking component (8);

when the ratchet teeth (84) are rotated to be engaged with the inner wall of the ratchet grooves (83), the rotation of the gear (82) in the direction of downward movement of the guide wheel (7) can be restricted.

4. A pressure regulating and anti-loosening device for a screen printer according to claim 3, wherein a torsion spring is arranged in the rotating shaft of the ratchet teeth (84), the torsion spring provides force for enabling the ratchet teeth (84) to be attached to the ratchet grooves (83), an electromagnet (85) is fixed between the ratchet teeth (84), and the electromagnet (85) provides adsorption force for enabling the ratchet teeth (84) to be separated from the ratchet grooves (83) when being electrified.