CN211678833U

CN211678833U - Signboard production is with dividing sieve device

Info

Publication number: CN211678833U
Application number: CN202020030765.0U
Authority: CN
Inventors: 刘英威
Original assignee: Hebei Yingwei Electric Appliance Co ltd
Current assignee: Hebei Yingwei Electric Appliance Co ltd
Priority date: 2020-01-08
Filing date: 2020-01-08
Publication date: 2020-10-16
Anticipated expiration: 2030-01-08

Abstract

The utility model discloses a screening device for signboard production, which belongs to the signboard technical field, and comprises a first supporting block, a dust removal thickness measuring device, a derivation device and a weighing sensor, wherein two first connecting plates are arranged on the upper surface of the first supporting block, the front surface of the first connecting plate positioned at the rear part is fixedly connected with the back surface of a first motor, the output shaft of the first motor is fixedly connected with a first transmission shaft, the first transmission shaft is clamped on the inner surface of a first rotating roller, and the first rotating roller is in transmission connection with a first transmission belt; two second connecting plates are arranged on the upper surfaces of the two second supporting blocks, and a dust removal and thickness measurement device is arranged at the upper ends of the second connecting plates; the upper surface of the fifth supporting block is fixedly connected with the lower surface of the weighing sensor; through setting up dust removal thickness measuring device, weighing sensor and deriving mutually supporting of device, make the device can divide sieve aluminum plate thickness and weight, sieve out the unqualified aluminum plate of thickness and weight, guaranteed the production quality of signboard.

Description

Signboard production is with dividing sieve device

Technical Field

The utility model belongs to the technical field of the signboard specifically is a signboard production is with dividing sieve device.

Background

The main material of using in the production of sign is aluminum plate, adopts the machining shaping to aluminum plate earlier usually, requires its size to reach standard unified back, carries out the processing of spraying paint again, consequently need divide the sieve to aluminum plate before the processing of spraying paint. What current signboard divides sieve device adopted still is traditional separation blade and divides the sieve mode, through the height of control separation blade to the thickness that control aluminum plate passed through, this kind divides sieve mode control accuracy poor, causes the mar to aluminum plate surface easily, influences the signboard quality. The separation blade divides the sieve device and only can divide the too big panel of sieve thickness, can not effectively sieve out to the aluminum plate that thickness is less than the separation blade, also can not divide the weight specification of sieve aluminum plate.

Signboard processing of spraying paint generally adopts the instrument processing of spraying paint, the instrument sprays paint and requires higher to the surface cleaning of panel, aluminum plate has more dust impurity on the surface when carrying out machining, can influence the quality of spraying paint of signboard, and main dust collector still is fan dust collector in the current aluminum plate production, dust removal effect is poor, other dust collector also have the inconvenient problem of changing of dust removal consumptive material, be difficult to guarantee the production quality of signboard, can not satisfy its production needs.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a signboard production is with dividing sieve device to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a screening device for signboard production comprises first supporting blocks, second supporting blocks, third supporting blocks, fourth supporting blocks, fifth supporting blocks, a dust removal thickness measuring device, a derivation device and a weighing sensor, wherein two first connecting plates are arranged on the upper surfaces of the two first supporting blocks, the front surface of the first connecting plate positioned behind the two first supporting blocks is fixedly connected with the back surface of a first motor, an output shaft of the first motor is fixedly connected with a first transmission shaft, the first transmission shaft is clamped on the inner surface of a first rotating roller, and the first rotating roller is in transmission connection with a first conveying belt; the front end of the first transmission shaft is sleeved with a first bearing, and the first bearing is clamped on the back of a first connecting plate positioned in front; two second connecting plates are arranged on the upper surfaces of the two second supporting blocks, and a dust removal and thickness measurement device is arranged at the upper ends of the second connecting plates; a third connecting plate is arranged on the upper surface of the third supporting block, and the third supporting block is positioned on the right side of the second supporting block behind the third supporting block; two fourth connecting plates are arranged on the upper surfaces of the two fourth supporting blocks, a second bearing is arranged on the front surface of the fourth connecting plate positioned behind the fourth supporting blocks, the second bearing is sleeved with a first rotating shaft, the first rotating shaft is clamped on the inner surface of a second rotating roller, and the second rotating roller is in transmission connection with a first conveyor belt; the front end of the first rotating shaft is sleeved with a third bearing, and the third bearing is clamped on the back of a fourth connecting plate positioned in front; the upper surface of the fifth supporting block is fixedly connected with the lower surface of the weighing sensor, the upper surface of the weighing sensor is fixedly connected with the lower surface of the connecting block, and the upper surface of the left side of the connecting block is provided with two fifth connecting plates; the front side of a fifth connecting plate positioned behind the second conveying belt is fixedly connected with the back side of a second motor, an output shaft of the second motor is fixedly connected with a second transmission shaft, a third rotating roller is clamped on the second transmission shaft, and the third rotating roller is in transmission connection with a second conveying belt; the second transmission shaft is sleeved on the inner surface of the fourth bearing, and the fourth bearing is clamped on the back of a fifth connecting plate positioned in front; a sixth connecting plate is arranged on the upper surface of the middle of the connecting block and is positioned behind the second conveying belt; the front surface of the third connecting plate and the front surface of the sixth connecting plate are respectively provided with a derivation device; the upper surface of the right side of the connecting block is provided with two seventh connecting plates, the front surface of the seventh connecting plate positioned at the rear side is provided with a fifth bearing, the fifth bearing is sleeved on the outer surface of one end of a second rotating shaft, the second rotating shaft is clamped on the inner surface of a fourth rotating roller, and the fourth rotating roller is in transmission connection with a second conveyor belt; and a sixth bearing is sleeved on the outer surface of the other end of the second rotating shaft and is clamped on the back of a seventh connecting plate positioned in front.

As a further aspect of the present invention: the right side surface of the second supporting block positioned in front is lapped with the left side surface of the first waste material box; the right side surface of the fifth connecting plate positioned in front and the left side surface of the seventh connecting plate positioned in front are respectively lapped with the left side and the right side of the second waste material box; the right side of the connecting block is in lap joint with the left side of the material collecting box.

As a further aspect of the present invention: the dust removal and thickness measurement device consists of a top plate, a sliding rod, a sliding sleeve, a first spring, a limiting block, a movable block, a third rotating shaft, a dust sticking roller, a first laser sensor part, a second laser sensor part and a connecting rod; the front side of the second connecting plate positioned at the rear is provided with a top plate, and the front side of the top plate is fixedly connected with the back side of the second connecting plate positioned at the front; a sliding rod is arranged on each of the front side and the rear side of the lower surface of the top plate; the outer surface of the sliding rod is sleeved with a sliding sleeve, and the lower end of the sliding rod is provided with a limiting block; the sliding sleeve is clamped on the inner surface of the rod groove, and the rod groove is formed in the upper surface of the movable block; the outer surface of the sliding rod is sleeved with a first spring, and the upper end and the lower end of the first spring are fixedly connected with the lower surface of the top plate and the upper surface of the sliding sleeve respectively; the front surface of the movable block positioned at the rear part is provided with an axial groove, the inner surface of the axial groove is clamped with a seventh bearing, the inner surface of the seventh bearing is sleeved with a third rotating shaft, the outer surface of the third rotating shaft is sleeved with a dust sticking roller, the outer surface of the front end of the third rotating shaft is sleeved with an eighth bearing, and the eighth bearing is clamped at the back surface of the movable block positioned at the front part; a first laser sensor part is arranged on the upper surface of the rear side of the front movable block; and a connecting rod is arranged on the lower surface of the middle of the top plate, and a second laser sensor component is arranged at the lower end of the connecting rod.

As a further aspect of the present invention: the derivation device consists of a derivation box, a cylinder, a material guide plate and a telescopic rod; the front of the third connecting plate and the front of the sixth connecting plate are welded with the pushing boxes on the left side and the right side respectively, the back of each pushing box is provided with an air cylinder, the front of each air cylinder is fixedly connected with one end of a telescopic rod, and the other end of each telescopic rod is provided with a material guide plate.

As a further aspect of the present invention: a baffle is arranged at the rear end of the third rotating shaft, and the back surface of the baffle is lapped with the front end of the screw; a through hole is formed in the back surface of the rear movable block, and a screw penetrates through the through hole; and the outer surface of the screw is sleeved with a second spring, and the front end and the rear end of the second spring are respectively fixedly connected with the back surface of the baffle and the front surface of the bottom of the shaft groove.

The utility model has the advantages that: the screening device for signboard production is used for dedusting an aluminum plate by arranging a top plate, a sliding rod, a sliding sleeve, a first spring, a limiting block, a movable block, a third rotating shaft, a dust sticking roller, a first laser sensor component, a second laser sensor component and a connecting rod, so that various dust impurities on the surface of the aluminum plate can be removed, the dedusting effect is good, meanwhile, the aluminum plate is subjected to thickness detection, and the aluminum plate with qualified thickness is screened out; the dust-sticking roller is convenient to replace by arranging a third rotating shaft, a baffle, a screw, a fixing plate and a second spring; detecting the weight specification of the aluminum plate by arranging a second conveyor belt and a weighing sensor; the unqualified aluminum plate is pushed into the waste material box by arranging the pushing and guiding box, the air cylinder, the material guide plate, the telescopic rod, the first waste material box and the second waste material box; through setting up dust removal thickness measuring device, weighing sensor and the mutually supporting of deriving the device, make signboard branch sieve device can accurately divide sieve aluminum plate thickness, divide the sieve in-process can not fish tail aluminum surface, remove dust to aluminum surface, the change of the loss material of also being convenient for dust removal when dust removal effect is good can divide sieve out aluminum plate weight specification, divides the unqualified aluminum plate of thickness and weight to sieve out, has guaranteed the production quality of signboard, can satisfy its production needs.

Drawings

Fig. 1 is a schematic sectional structure view of a front view of a screening device for signboard production.

Fig. 2 is a schematic sectional view of a screen device for producing a signboard in a plan view.

FIG. 3 is a schematic cross-sectional structure view of a side view of a dust removal thickness measuring device in a screening device for signboard production.

Fig. 4 is a schematic cross-sectional structure view of a top view of a derivation device in the screening device for producing the signboard.

In the figure: 1. a first support block; 2. a first connecting plate; 3. a first motor; 4. a first drive shaft; 5. a first rotating roller; 6. a first conveyor belt; 7. a second support block; 8. a second connecting plate; 9. a dust removal thickness measuring device; 10. a third support block; 11. a third connecting plate; 12. a derivation means; 13. a first waste material box; 14. a fourth support block; 15. a fourth connecting plate; 16. a first rotating shaft; 17. a second rotating roller; 18. a fifth support block; 19. a weighing sensor; 20. connecting blocks; 21. a fifth connecting plate; 22. a second motor; 23. a second drive shaft; 24. a third rotating roller; 25. a sixth connecting plate; 26. a second waste material box; 27. a second conveyor belt; 28. a seventh connecting plate; 29. a second rotating shaft; 30. a fourth rotating roller; 31. a material collecting box; 91. a top plate; 92. a slide bar; 93. a sliding sleeve; 94. a first spring; 95. a limiting block; 96. a movable block; 97. a third rotating shaft; 98. a baffle plate; 99. a screw; 911. a second spring; 912. a dust-sticking roller; 913. a first laser sensor component; 914. a second laser sensor component; 915. a connecting rod; 121. a cylinder; 122. a push box; 123. a material guide plate; 124. a telescopic rod.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Referring to fig. 1-4, a screening device for signboard production comprises a first supporting block 1, a second supporting block 7, a third supporting block 10, a fourth supporting block 14, a fifth supporting block 18, a dust-removing thickness measuring device 9, a derivation device 12 and a weighing sensor 19, wherein two first connecting plates 2 are arranged on the upper surfaces of the two first supporting blocks 1, the front surface of the first connecting plate 2 positioned behind is fixedly connected with the back surface of a first motor 3, the output shaft of the first motor 3 is fixedly connected with a first transmission shaft 4, the first transmission shaft 4 is clamped on the inner surface of a first rotating roller 5, and the first rotating roller 5 is in transmission connection with a first transmission belt 6; first transmission shaft 4 front end has cup jointed first bearing, and first bearing joint is at the back that is located the first connecting plate 2 in the place ahead, through setting up first motor 3, first transmission shaft 4, first live-rollers 5 and first conveyer belt 6, makes aluminum plate can convey right through first conveyer belt 6, conveniently carries out automatic branch sieve.

Two second connecting plates 8 are arranged on the upper surfaces of the two second supporting blocks 7, and a dust removal and thickness measurement device 9 is arranged at the upper ends of the second connecting plates 8; the dust removal and thickness measurement device 9 consists of a top plate 91, a sliding rod 92, a sliding sleeve 93, a first spring 94, a limiting block 95, a movable block 96, a third rotating shaft 97, a dust adhering roller 913, a first laser sensor component 914, a second laser sensor component 915 and a connecting rod 916; the front surface of the second connecting plate 8 positioned at the rear is provided with a top plate 91, and the front surface of the top plate 91 is fixedly connected with the back surface of the second connecting plate 8 positioned at the front; a sliding rod 92 is arranged on each of the front side and the rear side of the lower surface of the top plate 91; the outer surface of the slide rod 92 is sleeved with a sliding sleeve 93, and the lower end of the slide rod 92 is provided with a limiting block 95; the sliding sleeve 93 is clamped on the inner surface of the rod groove, and the rod groove is formed in the upper surface of the movable block 96; the outer surface of the sliding rod 92 is sleeved with a first spring 94, the upper end and the lower end of the first spring 94 are fixedly connected with the lower surface of the top plate 91 and the upper surface of the sliding sleeve 93 respectively, and the movable block 96 can be automatically adjusted up and down by arranging the top plate 91, the sliding rod 92, the sliding sleeve 93, the first spring 94, the limiting block 95 and the movable block 96, so that the surface of an aluminum plate is not scratched in the thickness detection process; the front surface of the movable block 96 positioned behind is provided with an axial groove, the inner surface of the axial groove is clamped with a seventh bearing, the inner surface of the seventh bearing is sleeved with a third rotating shaft 97, the outer surface of the third rotating shaft 97 is sleeved with a dust sticking roller 912, the outer surface of the front end of the third rotating shaft 97 is sleeved with an eighth bearing, the eighth bearing is clamped on the back surface of the movable block 96 positioned in front, and the surface of the passing aluminum plate is automatically dedusted by arranging the third rotating shaft 97, the dust sticking roller 912 and the movable block 96, so that the paint spraying quality of the signboard is improved; a baffle 98 is arranged at the rear end of the third rotating shaft 97, and the back surface of the baffle 98 is lapped with the front end of the screw 99; a through hole is arranged on the back of the rear movable block 96, and a screw 99 passes through the through hole; the outer surface of the screw 99 is sleeved with a second spring 911, the front end and the rear end of the second spring 911 are respectively fixedly connected with the back surface of the baffle 98 and the front surface of the bottom of the shaft groove, and the third rotating shaft 97 can be dismounted by screwing the screw 99 backwards through the arrangement of the dust-binding roller 912, the third rotating shaft 97, the baffle 98, the screw 99 and the second spring 911, so that the dust-binding roller 912 can be conveniently replaced; a first laser sensor part 913 is provided on the rear upper surface of the front movable block 96; the middle lower surface of the top plate 91 is provided with a connecting rod 915, the lower end of the connecting rod 915 is provided with a second laser sensor component 914, the passing aluminum plates are accurately detected in thickness through the first laser sensor component 913, the second laser sensor component 914, the connecting rod 915 and the movable block 96, the aluminum plates with unqualified thicknesses are screened, and the laser sensor types in the first laser sensor component 913 and the second laser sensor component 914 are E3F-20C1 laser correlation sensors.

A third connecting plate 11 is arranged on the upper surface of the third supporting block 10, and the third supporting block 10 is positioned at the right side of the second supporting block 7 at the rear; the upper surfaces of the two fourth supporting blocks 14 are provided with two fourth connecting plates 15, the front surface of the fourth connecting plate 15 positioned at the rear part is provided with a second bearing, the second bearing is sleeved with a first rotating shaft 16, the first rotating shaft 16 is clamped on the inner surface of a second rotating roller 17, and the second rotating roller 17 is in transmission connection with the first conveyor belt 6; the front end of the first rotating shaft 16 is sleeved with a third bearing, and the third bearing is clamped on the back of a fourth connecting plate 15 positioned in front; the upper surface of the fifth supporting block 18 is fixedly connected with the lower surface of the weighing sensor 19, the upper surface of the weighing sensor 19 is fixedly connected with the lower surface of the connecting block 20, and the upper surface of the left side of the connecting block 20 is provided with two fifth connecting plates 21; the front surface of a fifth connecting plate 21 positioned behind the fifth connecting plate is fixedly connected with the back surface of a second motor 22, an output shaft of the second motor 22 is fixedly connected with a second transmission shaft 23, the second transmission shaft 23 is connected with a third rotating roller 24 in a clamping mode, the third rotating roller 24 is connected with a second conveyor belt 27 in a transmission mode, the second conveyor belt 27 of the second motor 22, the second transmission shaft 23, the third rotating roller 24 and a weighing sensor 19 are arranged, weight detection is carried out on the aluminum plates passing through the second conveyor belt 27, the aluminum plates with unqualified weight are screened, and the weighing sensor 19 is an AT8502 weighing sensor in model number; the second transmission shaft 23 is sleeved on the inner surface of the fourth bearing, and the fourth bearing is clamped on the back of the fifth connecting plate 21 positioned in front; the upper surface in the middle of the connecting block 20 is provided with a sixth connecting plate 25, and the sixth connecting plate 25 is positioned behind the second conveyor belt 27.

The front surface of the third connecting plate 11 and the front surface of the sixth connecting plate 25 are respectively provided with a derivation device 12; the derivation device 12 consists of a derivation box 122, an air cylinder 121, a material guide plate 123 and an expansion link 124; the front surface of the third connecting plate 11 and the front surface of the sixth connecting plate 25 are respectively welded with the derivation boxes 122 on the left side and the right side, the back surface of the derivation box 122 is provided with an air cylinder 121, the front surface of the air cylinder 121 is fixedly connected with one end of a telescopic rod 124, the other end of the telescopic rod 124 is provided with a material guide plate 123, and by arranging the mutual matching among the derivation boxes 122, the air cylinder 121, the material guide plate 123 and the telescopic rod 124, aluminum plates with unqualified thickness and weight are separated out, so that the qualification rate of signboard production is improved; two seventh connecting plates 28 are arranged on the upper surface of the right side of the connecting block 20, a fifth bearing is arranged on the front surface of the seventh connecting plate 28 positioned behind the connecting block, the fifth bearing is sleeved on the outer surface of one end of a second rotating shaft 29, the second rotating shaft 29 is clamped on the inner surface of a fourth rotating roller 30, and the fourth rotating roller 30 is in transmission connection with a second conveyor belt 27; and a sixth bearing is sleeved on the outer surface of the other end of the second rotating shaft 29, and the sixth bearing is clamped on the back of the seventh connecting plate 28 positioned in front. The right side surface of the second supporting block 7 positioned in front is lapped with the left side surface of the first waste material box 13; the right side surface of the fifth connecting plate 21 positioned in front and the left side surface of the seventh connecting plate 28 positioned in front are respectively lapped with the left side and the right side of the second waste material box 26; the right side of the connecting block 20 is overlapped with the left side of the material collecting box 31.

The utility model discloses a theory of operation is: the first motor 3 is started to drive the first transmission shaft 4, the first transmission shaft 4 drives the first rotating roller 5, the first rotating roller 5 is matched with the second rotating roller 17 to drive the first conveyor belt 6 to convey rightwards, the aluminum plate is placed on the upper surface of the first conveyor belt 6 to convey rightwards, the aluminum plate is conveyed to the dust adhering roller 913 to perform automatic dust removal treatment, the dust adhering roller 913 drives the movable block 96 through the third rotating shaft 97, and the movable block 96 automatically ascends through the upper surface sliding rod 92, the sliding sleeve 93 and the first spring 94; then, the thickness of the passing aluminum plate is detected through a first laser sensor component 913 arranged on the upper surface of the movable block 96 and a second laser sensor component 914 arranged at the lower end of the connecting rod 915, when the thickness is too large or too small, the cylinder 121 on the third connecting plate 11 is started by the laser sensor, the cylinder 121 drives the telescopic rod 124 to stretch, and the telescopic rod 124 drives the material guide plate 123 to deduce the aluminum plate with unqualified thickness into the first waste material box 13; then, a second motor 22 is started to drive a second transmission shaft 23, the second transmission shaft 23 drives a third rotating roller 24, the third rotating roller 24 drives a second conveyor belt 27 to convey rightwards, the aluminum plate reaches the second conveyor belt 27 through a first conveyor belt 6 to continue conveying rightwards, after the aluminum plate reaches the second conveyor belt 27, a weighing sensor 19 below the second conveyor belt 27 detects the weight of the aluminum plate, the weighing sensor 19 starts an air cylinder 121 on a sixth connecting plate 25 when the aluminum plate is unqualified in weight, the air cylinder 121 drives an expansion link 124 to expand and contract, the expansion link 124 drives a material guide plate 123 to push the aluminum plate unqualified in weight into a second waste material box 26, and the aluminum plate qualified in weight is guided into a material collection box 31 through the second conveyor belt 27; screw 99 makes second spring 911 can contract through revolving backward, and second spring 911 contracts and drives baffle 98 and slide backward, and baffle 98 drives third axis of rotation 97 and slides backward and dismantles, makes things convenient for the sticky roller 912 that third axis of rotation 97 surface cup jointed to change.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.

Claims

1. A screening device for signboard production comprises first supporting blocks (1), second supporting blocks (7), third supporting blocks (10), fourth supporting blocks (14), fifth supporting blocks (18), a dust removal and thickness measurement device (9), a derivation device (12) and a weighing sensor (19), and is characterized in that two first connecting plates (2) are arranged on the upper surfaces of the two first supporting blocks (1), the front surface of the first connecting plate (2) positioned behind the first supporting blocks is fixedly connected with the back surface of a first motor (3), an output shaft of the first motor (3) is fixedly connected with a first transmission shaft (4), the first transmission shaft (4) is clamped on the inner surface of a first rotating roller (5), and the first rotating roller (5) is in transmission connection with a first transmission belt (6); the front end of the first transmission shaft (4) is sleeved with a first bearing, and the first bearing is clamped on the back of the first connecting plate (2) positioned in front; two second connecting plates (8) are arranged on the upper surfaces of the two second supporting blocks (7), and a dust removal and thickness measurement device (9) is arranged at the upper ends of the second connecting plates (8); a third connecting plate (11) is arranged on the upper surface of the third supporting block (10), and the third supporting block (10) is positioned on the right side of the second supporting block (7) behind the third supporting block; two fourth connecting plates (15) are arranged on the upper surfaces of the two fourth supporting blocks (14), a second bearing is arranged on the front surface of the fourth connecting plate (15) positioned at the rear part, the second bearing is sleeved with a first rotating shaft (16), the first rotating shaft (16) is clamped on the inner surface of a second rotating roller (17), and the second rotating roller (17) is in transmission connection with the first conveyor belt (6); the front end of the first rotating shaft (16) is sleeved with a third bearing, and the third bearing is clamped on the back of a fourth connecting plate (15) positioned in front; the upper surface of the fifth supporting block (18) is fixedly connected with the lower surface of a weighing sensor (19), the upper surface of the weighing sensor (19) is fixedly connected with the lower surface of a connecting block (20), and the upper surface of the left side of the connecting block (20) is provided with two fifth connecting plates (21); the front surface of a fifth connecting plate (21) positioned behind the first connecting plate is fixedly connected with the back surface of a second motor (22), an output shaft of the second motor (22) is fixedly connected with a second transmission shaft (23), a third rotating roller (24) is clamped on the second transmission shaft (23), and the third rotating roller (24) is in transmission connection with a second conveyor belt (27); the second transmission shaft (23) is sleeved on the inner surface of the fourth bearing, and the fourth bearing is clamped on the back of a fifth connecting plate (21) positioned in front; a sixth connecting plate (25) is arranged on the upper surface in the middle of the connecting block (20), and the sixth connecting plate (25) is positioned behind the second conveying belt (27); the front surface of the third connecting plate (11) and the front surface of the sixth connecting plate (25) are respectively provided with a derivation device (12); the upper surface of the right side of the connecting block (20) is provided with two seventh connecting plates (28), the front surface of the seventh connecting plate (28) positioned at the rear side is provided with a fifth bearing, the fifth bearing is sleeved on the outer surface of one end of a second rotating shaft (29), the second rotating shaft (29) is clamped on the inner surface of a fourth rotating roller (30), and the fourth rotating roller (30) is in transmission connection with a second conveyor belt (27); and a sixth bearing is sleeved on the outer surface of the other end of the second rotating shaft (29), and the sixth bearing is clamped on the back of a seventh connecting plate (28) positioned in front.

2. The screening device for signboard production according to claim 1, wherein the right side of the second support block (7) located in front overlaps the left side of the first waste material box (13); the right side surface of the fifth connecting plate (21) positioned in front and the left side surface of the seventh connecting plate (28) positioned in front are respectively lapped with the left side and the right side of the second waste material box (26); the right side face of the connecting block (20) is in lap joint with the left side face of the material collecting box (31).

3. The screening device for signboard production according to claim 1, wherein the dust-removing and thickness-measuring device (9) is composed of a top plate (91), a slide rod (92), a slide sleeve (93), a first spring (94), a limit block (95), a movable block (96), a third rotating shaft (97), a dust-binding roller (912), a first laser sensor component (913), a second laser sensor component (914) and a connecting rod (915); the front surface of the second connecting plate (8) positioned at the rear is provided with a top plate (91), and the front surface of the top plate (91) is fixedly connected with the back surface of the second connecting plate (8) positioned at the front; a sliding rod (92) is arranged on each of the front side and the rear side of the lower surface of the top plate (91); the outer surface of the sliding rod (92) is sleeved with a sliding sleeve (93), and the lower end of the sliding rod (92) is provided with a limiting block (95); the sliding sleeve (93) is clamped on the inner surface of the rod groove, and the rod groove is formed in the upper surface of the movable block (96); the outer surface of the sliding rod (92) is sleeved with a first spring (94), and the upper end and the lower end of the first spring (94) are respectively fixedly connected with the lower surface of the top plate (91) and the upper surface of the sliding sleeve (93); the front surface of the movable block (96) positioned at the rear part is provided with an axial groove, the inner surface of the axial groove is clamped with a seventh bearing, the inner surface of the seventh bearing is sleeved with a third rotating shaft (97), the outer surface of the third rotating shaft (97) is sleeved with a dust sticking roller (912), the outer surface of the front end of the third rotating shaft (97) is sleeved with an eighth bearing, and the eighth bearing is clamped at the back surface of the movable block (96) positioned at the front part; a first laser sensor part (913) is arranged on the upper surface of the rear side of the movable block (96) positioned in front; and a connecting rod (915) is arranged on the lower surface of the middle of the top plate (91), and a second laser sensor component (914) is arranged at the lower end of the connecting rod (915).

4. The screening device for signboard production according to claim 1, wherein the derivation device (12) is composed of a derivation box (122), a cylinder (121), a material guide plate (123) and a telescopic rod (124); the front face of the third connecting plate (11) and the front face of the sixth connecting plate (25) are respectively welded with the pushing boxes (122) on the left side and the right side, the back face of each pushing box (122) is provided with an air cylinder (121), the front face of each air cylinder (121) is fixedly connected with one end of a telescopic rod (124), and the other end of each telescopic rod (124) is provided with a material guide plate (123).

5. The screening device for signboard production according to claim 2, wherein a baffle plate (98) is provided at the rear end of the third rotating shaft (97), and the back of the baffle plate (98) is overlapped with the front end of the screw (99); a through hole is arranged on the back surface of the rear movable block (96), and a screw (99) passes through the through hole; and a second spring (911) is sleeved on the outer surface of the screw (99), and the front end and the rear end of the second spring (911) are respectively fixedly connected with the back surface of the baffle plate (98) and the front surface of the bottom of the shaft groove.