CN108340686B

CN108340686B - Printing equipment

Info

Publication number: CN108340686B
Application number: CN201810340999.2A
Authority: CN
Inventors: 潘中华; 朱忠伟; 张春林; 金圣易
Original assignee: Matsuoka Printing Co ltd
Current assignee: Matsuoka Printing Co ltd
Priority date: 2018-04-17
Filing date: 2018-04-17
Publication date: 2023-08-11
Anticipated expiration: 2038-04-17
Also published as: CN108340686A

Abstract

The invention provides printing equipment, and belongs to the technical field of printing. The printing equipment solves the technical problems that the positions of patterns on the outer packaging paper obtained by the existing printing equipment are not uniform and the like. The printing equipment comprises a frame, a conveying belt arranged on the frame in a rotating manner and a plurality of printing spray heads fixed on the frame and positioned right above the middle section of the conveying belt, wherein the front end of the conveying belt positioned on the frame is rotationally connected with an unreeling roller, a paper collecting mechanism is arranged right below the conveying belt in the frame, the conveying belt can adsorb glass paper positioned on the conveying belt on the surface of the conveying belt and is positioned right above the paper collecting mechanism, the conveying belt enables the glass paper adsorbed on the conveying belt to be separated, and an ink drying mechanism capable of accelerating ink drying on the glass paper is arranged right opposite to the rear end of the conveying belt in the frame. The invention has the advantage that the printing positions of the printed patterns of the outer packaging paper are uniform.

Description

Printing equipment

Technical Field

The invention belongs to the technical field of printing, and relates to printing equipment.

Background

In the prior art, the package is wrapped with outer packaging paper such as glass paper, advertisement and product information are printed on the outer packaging paper, and the printing of the outer packaging paper is automatically finished through printing equipment. In the printing process, the rolled outer packaging paper is firstly spread and cut into individual outer packaging paper, then pattern information is printed on the individual outer packaging paper through a printing spray head, and finally the printed outer packaging paper is piled and collected. Cutting in the existing printing equipment is required to be completed through an independent machine, so that the cost is increased; the independent outer packing paper is carried through the conveyer belt, and the outer packing paper has the problem of shifting in the transportation process, leads to printing shower nozzle and the relative position of outer packing paper unable unified, and pattern position on the outer packing paper after the printing is accomplished is non-unified, and the defective goods is more.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides printing equipment, which can unify the printing positions of patterns of outer packaging paper obtained by printing.

The aim of the invention can be achieved by the following technical scheme:

the utility model provides a lithography apparatus, includes the frame, rotates the conveyer belt that sets up in the frame and fix in the frame and be located a plurality of print shower nozzles directly over the conveyer belt middle section, its characterized in that, be located the front end rotation that the conveyer belt is connected with unreel the roller in the frame, be equipped with paper collection mechanism directly under the conveyer belt in the frame, the conveyer belt can be with the glass paper that is located the conveyer belt adsorb on its surface and be located the conveyer belt directly over the paper collection mechanism and make the glass paper that adsorbs on it break away from, be equipped with the printing ink drying mechanism that can accelerate the printing ink on the glass paper with the rear end position of just right in the frame.

The unreeling roller releases the glass paper, and the glass paper on the conveying belt is adsorbed on the unreeling roller, so that the glass paper on the conveying belt cannot be displaced in the conveying process, namely, the relative positions between the glass paper and the printing spray heads are the same during printing, the uniformity of the pattern printing positions of the outer packaging paper is guaranteed, the drying of the printing ink can be accelerated through the printing ink drying mechanism, and the printing ink is guaranteed to be completely dried when the glass paper enters the paper collecting mechanism.

In the printing equipment, the printing ink drying mechanism comprises a drying fan, a vent is formed in one side, close to the rear end of the conveying belt, of the frame, the drying fan is fixed at the vent, the drying fan is inclined downwards and faces towards the rear end of the conveying belt, an upper wind shield is fixed on one side, close to the drying fan, of the printing spray head, located on the frame, the lower end, close to the conveying belt, of the upper wind shield, a lower wind shield is further fixed on the lower portion, located on the frame, of the conveying belt, and the lower wind shield is located right below the rear end of the conveying belt and the upper end, close to the conveying belt, of the lower wind shield. The drying fan blows air to the rear end of the conveyor belt, the orientation of the drying fan can avoid shifting the glass paper on the rear end of the conveyor belt, and the drying of the printing ink on the glass paper can be accelerated by increasing air circulation; the upper wind guard and the lower wind guard can avoid the moving air from shifting the glass paper at other positions on the conveyor belt.

In the printing equipment, a dust cover is further fixed on the frame at the vent. The dust cover can prevent dust from entering the frame and prevent dust from falling on the glass paper.

In the printing equipment, a plurality of ventilation holes are fixed on the side plate, which is positioned between the lower wind shield and the upper wind shield, of the frame. This structure can guarantee by the quick outflow of drying fan blowing in air, avoids down the pressure increase between deep bead and the last deep bead to lead to the air to flow through from going up between deep bead and the conveyer belt or lower deep bead and the conveyer belt to guarantee that the cellophane fixed position on the conveyer belt is unchangeable.

In the printing equipment, a guide roller is further arranged between the unreeling roller and the conveying belt on the frame, and the lower tangent plane of the guide roller is aligned with the upper side surface of the conveying belt. The guide roller makes the glassine paper discharged by the unreeling roller attached to the conveying belt.

In the printing equipment, a paper cutting roller is arranged between the guide roller and the printing spray head on the frame, a swing motor capable of driving the paper cutting roller to swing back and forth is arranged on the frame, an eccentric part is arranged on the paper cutting roller, paper cutting cutters are fixed on the eccentric part, a plurality of paper cutting notches are formed in the conveying belt at equal intervals, and when the paper cutting notches of the conveying belt move to the position below the paper cutting roller, the swing motor can drive the paper cutting roller to swing downwards and enable the cutting edges of the paper cutting cutters to penetrate into the paper cutting notches. Through the structure, the whole section of glass paper can be cut into the packaging paper of Zhang Duli, and each paper cutting notch moves to the position below the paper cutting roller to realize one-time paper cutting, so that the same size of each glass paper is ensured, and the operation of the swing motor is controlled by the controller, so that the glass paper cutting machine is in the prior art.

In the printing equipment, the paper collecting mechanism comprises a bottom plate, two parallel baffle plates fixed on the bottom plate and a lifting plate positioned between the two baffle plates, wherein two parallel telescopic plates are vertically fixed on the lifting plate, the telescopic plates are positioned between the two baffle plates and are perpendicular to the two baffle plates, each telescopic plate comprises a plurality of telescopic frames, the telescopic frames which are sequentially connected and positioned below can be inserted into the telescopic frames positioned above, a plurality of limit grooves which are in one-to-one correspondence with the telescopic frames are vertically formed in the baffle plates, the limit grooves of the plurality of limit grooves are arranged in a ladder shape, the two sections of the telescopic frames can respectively extend into the corresponding limit grooves, and the bottom plate is provided with a lifting mechanism capable of driving the lifting plate to move up and down.

The glass paper can break away from the conveyer belt when the conveyer belt rotates to the lifter plate directly over, the glass paper can drop between two baffles and two expansion plates, two baffles and two expansion plates play the guide effect, when the lifter plate just begins to collect paper, in order to reduce the distance that the glass paper dropped, lift the lifter plate to the highest point through elevating system, the expansion plate is in the shrink state at this moment, the interval between lifter plate and the conveyer belt is minimum, therefore the glass paper can accurately and neatly drop and stack on the lifter plate, along with the thickness increase that the glass paper stacks, the elevating system drives the lifter plate to move down and give out the stacking space, but the distance that the glass paper dropped remains unchanged all the time, therefore, the glass paper that can guarantee to collect stacks neatly.

In the printing equipment, the lifting mechanism comprises a lifting motor and a screw rod, a rotating seat is fixed at the upper end of the baffle plate, the screw rod is rotationally connected between the rotating seat and the bottom plate, the screw rod penetrates through the lifting plate and is in threaded connection with the lifting plate, a rotating gear is fixed at the lower end of the screw rod, the lifting motor is fixed on the bottom plate, a driving gear is fixed on a motor shaft of the lifting motor, and the driving gear is meshed with the rotating gear. The lifting motor drives the screw rod to rotate so as to realize up-and-down lifting of the lifting plate, and the screw rod transmission can realize uninterrupted transmission, so that the lifting plate can descend at a constant speed along with the stacking of the glass papers when collecting the glass papers.

In the printing equipment, the conveyer belt includes the inner belt body, outer belt body and a plurality of flexible trachea, open on the outer belt body has a plurality of groups air vent, all has a plurality of rectangular array distribution's air vent in every group air vent, a plurality of the trachea sets up between the inner belt body and outer belt body, tracheal both ends are all sealed, it has a plurality of to the suction port of outer belt body to open on the trachea, every the air vent all aligns the intercommunication with the tracheal suction port that corresponds, have down the air cock on the trachea, the air cock passes the inner belt body, be fixed with on the inboard of the inner belt body with the miniature air pump of trachea one-to-one, the air inlet of miniature air pump communicates with tracheal air cock.

When printing, the micro air pump operates to pump air from the air pipe, and air can enter the air pipe through the vent hole and the air suction hole, so that negative pressure is formed at the vent hole of the outer belt body, and when the cellophane is attached to the outer belt body, the cellophane is adsorbed on the outer belt body under the action of the negative pressure, so that the position of the cellophane is ensured to be accurate during printing; the micro air pump can be powered by a battery, the switch of the micro air pump is controlled by the controller, when the conveyer belt corresponding to the micro air pump rotates to the position right above the paper collecting mechanism, the micro air pump stops working, so that the glass paper can drop off from the conveyer belt, when the conveyer belt corresponding to the micro air pump rotates to the printing station, the micro air pump is started to position the glass paper, the accuracy of the printing position is ensured, and the opening and closing positions of the micro air pump can be determined by the position sensor; the flexible air pipe can ensure that the air pipe can rotate along with the conveyer belt when the conveyer belt rotates.

Compared with the prior art, the printing equipment has the advantages of unified printing position of the printed outer packaging paper pattern and compact overall structure.

Drawings

Fig. 1 is a schematic sectional structure and a partial enlarged view of the present printing apparatus.

Fig. 2 is a schematic cross-sectional structure of a conveyor belt in the present printing apparatus.

Fig. 3 is a schematic cross-sectional structure of the present sheet collection mechanism.

Fig. 4 is a schematic view of a partial sectional structure of the positional relationship between the expansion plate and the baffle plate when the present lifter plate is positioned at the lowermost end.

Fig. 5 is a schematic view of a partial sectional structure of the positional relationship between the expansion plate and the baffle plate when the present lifter plate is positioned at the uppermost end.

In the figure, 1, a rack; 11. a vent; 12. a vent hole; 13. a guide rail; 14. an electric cylinder; 15. printing a spray head; 2. a drying fan; 21. an upper wind deflector; 22. a lower wind deflector; 23. a dust cover; 3. a conveyor belt; 31. an inner belt body; 311. a lower limit convex strip; 312. supporting and flanging; 32. an outer belt body; 321. a vent hole; 322. an upper limit convex strip; 323. cutting a paper notch; 33. an air pipe; 331. an air suction hole; 332. an air tap; 34. a micro air pump; 35. a rotating shaft; 36. a relief ring groove; 37. a baffle ring; 4. an unreeling roller; 41. a guide roller; 42. cutting paper rolls; 421. a eccentric portion; 422. a paper cutter; 5. a bottom plate; 51. a baffle; 511. a limit groove; 512. a guide groove; 513. a rotating seat; 52. a lifting plate; 53. a telescoping plate; 531. a telescoping frame; 54. a lifting motor; 541. a drive gear; 55. a screw rod; 551. rotating the gear; 56. a barrier strip; 561. a wedge-shaped portion.

Detailed Description

The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, the printing device comprises a frame 1, a conveying belt 3 rotatably arranged on the frame 1, and a plurality of printing spray heads 15 fixed on the frame 1 and positioned right above the middle section of the conveying belt 3, wherein the front end of the frame 1 positioned on the conveying belt 3 is rotatably connected with an unreeling roller 4, a paper collecting mechanism is arranged in the frame 1 and positioned right below the conveying belt 3, the conveying belt 3 can adsorb glass paper positioned on the conveying belt 3 on the surface of the conveying belt and the conveying belt 3 positioned right above the paper collecting mechanism so that the glass paper adsorbed on the conveying belt is separated, and an ink drying mechanism capable of accelerating ink drying on the glass paper is arranged right at the position of the rear end of the frame 1 and the conveying belt 3.

As shown in fig. 1, the ink drying mechanism comprises a drying fan 2, a ventilation opening 11 is formed in one side, close to the rear end of a conveying belt 3, of a frame 1, a dust cover 23 is further fixed at the ventilation opening 11, the drying fan 2 is inclined downwards and faces the rear end of the conveying belt 3, an upper wind shield 21 is fixed on one side, close to the drying fan 2, of a printing nozzle 15, of the frame 1, the lower end of the upper wind shield 21 is close to the conveying belt 3, a lower wind shield 22 is further fixed below the conveying belt 3 on the frame 1, and the lower wind shield 22 is located right below the rear end of the conveying belt 3 and the upper end of the lower wind shield 22 is close to the conveying belt 3. A plurality of ventilation holes 12 are fixed on a side plate of the frame 1, which is positioned between the lower wind deflector 22 and the upper wind deflector 21. A guide roller 41 is also arranged on the frame 1 between the unreeling roller 4 and the conveying belt 3, and the lower tangent plane of the guide roller 41 is aligned with the upper side surface of the conveying belt 3.

The drying fan 2 blows air to the rear end of the conveyor belt 3, the orientation of the drying fan 2 can avoid shifting the glass paper on the rear end of the conveyor belt 3, and the drying of the printing ink on the glass paper can be accelerated by increasing the ventilation; the upper and lower windshields 21, 22 prevent the moving air from displacing the glassine paper elsewhere on the conveyor belt 3. The dust cover 23 can prevent dust from entering the frame 1 and falling dust on the cellophane.

As shown in fig. 1, a paper cutting roller 42 is arranged between a guide roller 41 and a printing nozzle 15 on a frame 1, a swing motor capable of driving the paper cutting roller 42 to swing back and forth is arranged on the frame 1, an eccentric portion 421 is arranged on the paper cutting roller 42, a paper bias cutter 422 is fixed on the eccentric portion 421, a plurality of paper cutting notches 323 are formed on a conveying belt 3 at equal intervals, and when the paper cutting notches 323 of the conveying belt 3 move to the position below the paper cutting roller 42, the swing motor can drive the paper cutting roller 42 to swing downwards so that the cutting edge of the paper bias cutter 422 penetrates into the paper cutting notches 323. Through the structure, the whole section of glass paper can be cut into a piece of Zhang Duli packaging paper, and each paper cutting notch 323 moves to the lower part of the paper cutting roller 42 to realize one-time paper cutting, so that the same size of each piece of glass paper is ensured, and the operation of the swing motor is controlled by the controller, so that the glass paper cutting machine is in the prior art.

As shown in fig. 1, fig. 3, fig. 4 and fig. 5, the paper collecting mechanism comprises a bottom plate 5, two parallel baffle plates 51 fixed on the bottom plate 5 and a lifting plate 52 positioned between the two baffle plates 51, two parallel telescopic plates 53 are vertically fixed on the lifting plate 52, the two telescopic plates 53 are positioned between the two baffle plates 51 and are vertical to the two baffle plates 51, the telescopic plates 53 comprise a plurality of sections of telescopic frames 531, the sections of telescopic frames 531 are sequentially connected and positioned below the telescopic frames 531 can be inserted into the telescopic frames 531 positioned above the telescopic frames 531, a plurality of sections of limit grooves 511 which are in one-to-one correspondence with the telescopic frames 531 are vertically arranged on the baffle plates 51, the two sections of the telescopic frames 531 can respectively extend into the corresponding limit grooves 511, and the lifting mechanism capable of driving the lifting plate 52 to move up and down is arranged on the bottom plate 5. The lifting mechanism comprises a lifting motor 54 and a screw rod 55, a rotating seat 513 is fixed at the upper end of the baffle plate 51, the screw rod 55 is rotationally connected between the rotating seat 513 and the bottom plate 5, the screw rod 55 penetrates through the lifting plate 52 and is in threaded connection with the lifting plate 52, a rotating gear 551 is fixed at the lower end of the screw rod 55, the lifting motor 54 is fixed on the bottom plate 5, a driving gear 541 is fixed on a motor shaft of the lifting motor 54, and the driving gear 541 is meshed with the rotating gear 551.

As shown in fig. 3, a barrier rib 56 is fixed between the upper ends of the two baffles 51, the barrier rib 56 is positioned at the rear end of the baffles 51, the upper part of the barrier rib 56 is provided with a wedge-shaped part 561 with a right triangle cross section, one right-angle side of the wedge-shaped part 561 is abutted against the conveyer belt 3, and the sharp angle of the wedge-shaped part 561 faces the rear end of the conveyer belt 3. The glass paper which is not completely dropped can be blocked by the wedge-shaped part 561, so that the glass paper can be separated from the conveyer belt 3.

As shown in fig. 3, two guide rails 13 are arranged at the bottom of the frame 1, an opening is formed in a side plate of the frame 1, the two guide rails 13 penetrate through the opening, the guide rails 13 are perpendicular to the conveying belt 3, the bottom plate 5 is slidably connected to the guide rails 13, an electric cylinder 14 is further arranged at the bottom of the frame 1, the electric cylinder 14 is located below the bottom plate 5, and the movable end of the electric cylinder 14 is fixed with the bottom plate 5. The electric cylinder 14 can drive the bottom plate 5 to move back and forth, and can move the bottom plate 5 out of the frame 1 when the glass paper collection is completed, so that the glass paper after printing can be conveniently recovered.

As shown in fig. 1 and 3, the middle parts of the two side walls of the lifting plate 52 are provided with protruding guide strips, the two baffle plates 51 are vertically provided with guide grooves 512, the guide strips can be inserted into the corresponding guide grooves 512, the cross sections of the limit strips are square, and the two side surfaces of the limit strips are abutted against the two side surfaces of the guide grooves 512. The guide bar can slide up and down along the guide groove 512 so that the lifting plate 52 is kept horizontal while moving up and down.

The glass paper can break away from conveyer belt 3 when conveyer belt 3 rotates to lift plate 52 directly over, the glass paper can drop between two baffles 51 and two expansion plates 53, two baffles 51 and two expansion plates 53 play the guide effect, when lift plate 52 just begins to collect the paper, in order to reduce the distance that glass paper dropped, lift plate 52 is lifted to the highest point through elevating system, expansion plate 53 is in the shrink state this moment, the interval between lift plate 52 and conveyer belt 3 is minimum, therefore glass paper can accurately and neatly drop and pile up on lift plate 52, along with the thickness increase that glass paper piled up, elevating system drives lift plate 52 to move down vacating the stack space, but the distance that glass paper dropped remains unchanged all the time, consequently, the glass paper that can guarantee to collect piles up neatly. The lifting motor 54 drives the screw rod 55 to rotate so as to realize the up-and-down lifting of the lifting plate 52, and the screw rod 55 can realize uninterrupted transmission, so that the lifting plate 52 can descend at a constant speed along with the stacking of the glass papers when the glass papers are collected.

As shown in fig. 1 and 2, the conveying belt 3 comprises an inner belt body 31, an outer belt body 32 and a plurality of flexible air pipes 33, a plurality of groups of air holes 321 are formed in the outer belt body 32, a plurality of rectangular array distributed air holes 321 are formed in each group of air holes 321, a plurality of air pipes 33 are arranged between the inner belt body 31 and the outer belt body 32, two ends of each air pipe 33 are closed, a plurality of air suction holes 331 facing the outer belt body 32 are formed in each air pipe 33, each air hole 321 is communicated with the corresponding air suction hole 331 of the corresponding air pipe 33 in an aligned mode, downward air nozzles 332 are formed in each air pipe 33, the air nozzles 332 penetrate through the inner belt body 31, miniature air pumps 34 corresponding to the air pipes 33 one by one are fixed on the inner side of the inner belt body 31, and air inlets of the miniature air pumps 34 are communicated with the air nozzles 332 of the air pipes 33.

As shown in fig. 1 and 2, the outer side surface of the inner belt body 31 is provided with a plurality of annular lower limit convex strips 311, the middle part of the lower limit convex strips 311 is provided with a lower annular clamping groove, and the lower side part of the air pipe 33 is clamped into the lower annular clamping groove. The inner side surface of the outer belt body 32 is provided with a plurality of annular upper limit convex strips 322, the middle part of the upper limit convex strips 322 is provided with an upper annular clamping groove, the vent 321 is communicated with the corresponding upper annular clamping groove, and the upper side part of the air pipe 33 is clamped into the upper annular clamping groove. The frame 1 is rotatably connected with two rotating shafts 35, the inner belt body 31 is sleeved between the two rotating shafts 35, a plurality of abdication ring grooves 36 are formed in the rotating shafts 35, and the micro air pump 34 can pass through the abdication ring grooves 36. The abdication ring groove 36 can enable the rotation shaft 35 to drive the conveyer belt 3 to rotate, and simultaneously enable the micro air pump 34 rotating along with the inner belt body 31 to smoothly rotate. Both ends of the rotating shaft 35 are protruded relative to both sides of the inner belt body 31 and the outer belt body 32, both ends of the rotating shaft 35 are provided with baffle rings 37, and both sides of the inner belt body 31 and both sides of the outer belt are abutted against the inner sides of the corresponding baffle rings 37. The inner band 31 has raised support flanges 312 on both sides, the support flanges 312 abutting against the inner side of the outer band 32. The cut-out notch 323 is located between the two sets of vent holes 321. This configuration allows each set of vent holes 321 to hold a sheet of cellophane.

When printing, the micro air pump 34 operates to pump air from the air pipe 33, and air enters the air pipe 33 through the air hole 321 and the air suction hole 331, so that negative pressure is formed at the air hole 321 of the outer belt body 32, and when the glass paper is attached to the outer belt body 32, the glass paper is adsorbed on the outer belt body 32 under the action of the negative pressure, so that the position of the glass paper is ensured to be accurate during printing; the micro air pump 34 can be powered by a battery, the switch of the micro air pump 34 is controlled by the controller, when the conveyer belt 3 corresponding to the micro air pump 34 rotates to be right above the paper collecting mechanism, the micro air pump 34 stops working, so that the glass paper can be separated from the conveyer belt 3 and fall off, when the conveyer belt 3 corresponding to the micro air pump 34 rotates to a printing station, the micro air pump 34 is started to position the glass paper, the accuracy of the printing position is ensured, and the opening and closing positions of the micro air pump 34 can be determined by the position sensor; the flexible air tube 33 ensures that the air tube 33 rotates with the conveyor belt 3 when the conveyor belt 3 rotates.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The printing equipment comprises a frame, a conveying belt rotatably arranged on the frame and a plurality of printing spray heads fixed on the frame and positioned right above the middle section of the conveying belt, and is characterized in that the front end of the conveying belt on the frame is rotatably connected with an unreeling roller, a paper collecting mechanism is arranged right below the conveying belt in the frame, the conveying belt can adsorb glass paper positioned on the conveying belt on the surface of the conveying belt and the conveying belt positioned right above the paper collecting mechanism enables the glass paper adsorbed on the conveying belt to be separated, and an ink drying mechanism capable of accelerating ink drying on the glass paper is arranged right above the rear end of the conveying belt on the frame; the printing ink drying mechanism comprises a drying fan, a vent is formed in one side, close to the rear end of the conveying belt, of the rack, the drying fan is fixed at the vent, the drying fan is inclined downwards and faces to the rear end of the conveying belt, an upper wind deflector is fixed on one side, close to the drying fan, of the printing spray head on the rack, the lower end of the upper wind deflector is close to the conveying belt, a lower wind deflector is also fixed on the lower part, close to the conveying belt, of the rack, and the lower wind deflector is located right below the rear end of the conveying belt and the upper end of the lower wind deflector is close to the conveying belt; a plurality of ventilation holes are fixed on a side plate, which is positioned between the lower wind deflector and the upper wind deflector, of the frame; the paper collecting mechanism comprises a bottom plate, two parallel baffle plates fixed on the bottom plate and a lifting plate positioned between the two baffle plates, wherein two parallel expansion plates are vertically fixed on the lifting plate, the two expansion plates are positioned between the two baffle plates and are perpendicular to the two baffle plates, each expansion plate comprises a plurality of sections of expansion frames, the expansion frames which are sequentially connected and positioned below can be inserted into the expansion frames positioned above, a plurality of sections of limit grooves which are in one-to-one correspondence with the expansion frames are vertically arranged on the baffle plates, the plurality of sections of limit grooves are arranged up and down in a ladder shape, the two sections of the expansion frames can respectively extend into the corresponding limit grooves, and the bottom plate is provided with a lifting mechanism capable of driving the lifting plate to move up and down.

2. The printing apparatus of claim 1, wherein a dust cover is further secured to the housing at the vent.

3. The printing apparatus of claim 1 wherein a guide roller is further provided on the frame between the unwind roller and the conveyor belt, the guide roller having a lower tangent plane aligned with an upper side of the conveyor belt.

4. A printing device according to claim 3, wherein a paper cutting roller is arranged between the guide roller and the printing nozzle on the frame, a swinging motor capable of driving the paper cutting roller to swing back and forth is arranged on the frame, an eccentric part is arranged on the paper cutting roller, paper cutting knives are fixed on the eccentric part, a plurality of paper cutting notches are formed in the conveyor belt at equal intervals, and when the paper cutting notches of the conveyor belt move to the position below the paper cutting roller, the swinging motor can drive the paper cutting roller to swing downwards and enable the cutting edges of the paper cutting knives to penetrate the paper cutting notches.

5. The printing apparatus of claim 1, wherein the lifting mechanism comprises a lifting motor and a screw, a rotating seat is fixed at an upper end of the baffle plate, the screw is rotatably connected between the rotating seat and the bottom plate, the screw passes through the lifting plate and is in threaded connection with the lifting plate, a rotating gear is fixed at a lower end of the screw, the lifting motor is fixed on the bottom plate, a driving gear is fixed on a motor shaft of the lifting motor, and the driving gear is meshed with the rotating gear.

6. The printing device according to claim 1, wherein the conveying belt comprises an inner belt body, an outer belt body and a plurality of flexible air pipes, a plurality of groups of vent holes are formed in the outer belt body, a plurality of rectangular array distributed vent holes are formed in each group of vent holes, a plurality of air pipes are arranged between the inner belt body and the outer belt body, two ends of each air pipe are sealed, a plurality of air suction holes facing the outer belt body are formed in each air pipe, each vent hole is communicated with the corresponding air suction hole of the corresponding air pipe in an aligned mode, a downward air nozzle is arranged on each air pipe, the air nozzle penetrates through the inner belt body, a miniature air pump in one-to-one correspondence with the air pipes is fixed on the inner side of the inner belt body, and an air inlet of the miniature air pump is communicated with the air nozzle of the air pipe.