CN213891797U - Four-color printing machine - Google Patents

Abstract

The application relates to a four-color printing machine, and relates to the technical field of printing equipment. In the process of spraying powder to the printed paper, if the conveying speed of the paper is high, the powder spraying amount may need to be increased, the air flow rate for carrying the powder is increased by adjusting the rotating speed of the air pump, turbulent flow may occur when air contacts the paper, and then the powder attached to the surface of the paper is raised, and the situation that the ink of the lower layer of paper is stained on the back of the upper layer of paper still may occur. This application includes organism, feed mechanism, printing mechanism, discharge mechanism and the mechanism of dusting, and the mechanism of dusting is including depositing powder case, nozzle, connecting defeated powder pipe and the first air pump between depositing powder case and nozzle, and the lower extreme of nozzle is equipped with big or small adjustable meal outlet. After the flow velocity of air increases, can reduce air velocity through enlarging the meal outlet to the reduction appears because of the higher condition that appears the turbulent flow of air velocity, is favorable to improving printing quality.

Description

Four-color printing machine

Technical Field

The application relates to the field of printing equipment, in particular to a four-color printing machine.

Background

A four-color printer refers to a printer that performs full-color reproduction using four inks of red, yellow, blue, and black according to the subtractive color mixing principle. In order to improve printing efficiency, the printed paper is usually directly wound without air drying, and ink of another paper may adhere to the back surface of the paper, thereby reducing the printing quality of the paper. In order to solve the above problems, a layer of powder is usually sprayed on the surface of the paper before the paper is wound, so that the adhesion of ink is reduced, and the adhesion of ink to the paper in contact with the paper is reduced.

The printing machine comprises a feeding mechanism, a printing mechanism, a discharging mechanism and a powder spraying mechanism, wherein the powder spraying mechanism is arranged between the printing mechanism and the discharging mechanism, and comprises a powder storage box for storing powder, a nozzle, a powder conveying pipe connected between the nozzle and the powder storage box and a first air pump arranged on the powder conveying pipe. And in the process of conveying the printed paper to a material collector of the printing machine, the nozzle sprays airflow mixed with the powder onto the surface of the paper, so that the powder spraying process is completed.

In order to increase the amount of powder spread on the paper, it is common to increase the rotation speed of the blades of the first air pump, thereby increasing the flow rate of the first air pump so that more powder is ejected from the nozzles. However, after the rotation speed of the first air pump is increased, the flow velocity of the air flow is increased, turbulence is easily generated when the air flow contacts and impacts paper, and the turbulence may lift powder in an adjacent area where powder spraying is completed, so that the powder distribution on the paper is uneven, and the situation that ink adheres to the paper may still occur.

SUMMERY OF THE UTILITY MODEL

In order to reduce the condition that the air current disorder leads to the powder to be raised, promote the powder evenly distributed on the paper, this application provides a four-color printing machine.

The application provides a four-color printing machine adopts following technical scheme:

the utility model provides a four-color printing machine, including feed mechanism, printing mechanism, discharge mechanism and the mechanism of dusting, the mechanism of dusting is including depositing the powder case, one end is connected in the defeated powder pipe of depositing the powder case, connect in the nozzle of defeated powder pipe other end and set up the first air pump on defeated powder pipe, it is equipped with the air inlet to deposit the powder case, nozzle department is equipped with fixed stop and the adjustable fender who is on a parallel with fixed stop, form out the powder mouth between fixed stop and the adjustable fender, adjustable fender department is equipped with and is used for driving the driving piece that adjustable fender is close to or keeps away from fixed stop.

Through adopting above-mentioned technical scheme, under the effect of driving piece, adjustable fender can be close to or keep away from fixed stop for the cross-sectional area of powder outlet is adjustable. When the powder spraying amount in unit time needs to be increased, the rotating speed of the blades of the first air pump is increased, the flow speed of air flow is increased, the flow in the powder conveying pipe is increased, the cross-sectional area of the powder outlet is enlarged, the flow speed of the powder outlet is reduced, the situation that the air flow speed is high, so that the contact with paper to generate turbulence is avoided, the powder is uniformly distributed on the paper, and the printing quality is improved.

Optionally, the powder outlet is arranged in a direction from the inside of the nozzle to the outside in a gradually expanding manner.

By adopting the technical scheme, when the airflow passes through the divergent section, the cross-sectional area of the divergent section is gradually increased along the flowing direction of the air, and the flow rate is kept unchanged, so that the flow velocity of the airflow is gradually reduced when the airflow passes through the divergent section, the probability that the airflow impacts the paperboard to possibly generate turbulence is further reduced, and the printing quality is favorably improved.

Optionally, the four-color printing machine further comprises a powder recovery mechanism, the powder recovery mechanism comprises a powder suction cover, a recovery pipe and a second air pump, one end of the recovery pipe is connected to the powder suction cover, and the other end of the recovery pipe is connected to the powder storage box.

Through adopting above-mentioned technical scheme, at the in-process that dusts to the paper, can inevitably appear some powder and float the condition in the air along with the air current, set up the powder and retrieve the subassembly and can inhale back the powder case with some powder, be favorable to resources are saved, reduce the cost, also be favorable to reducing the condition that appears the powder and adhere to inside spare part and influence spare part normal work.

Optionally, the recovery tube includes the separation section that the level set up and connects in the separation section and deposit the powder section between the powder case, and the powder section is connected in the lower extreme of separation section, and powder recovery mechanism still includes gas-powder separating assembly, and gas-powder separating assembly includes horizontal connection and keeps away from in the separation section in the outlet duct of inhaling powder cover one end, set up the spacer plate in the separation section, sets up the diversion hole that a plurality of runs through the spacer plate on the spacer plate.

Through adopting above-mentioned technical scheme, when the air current carried the powder through the separation plate, the separation plate can prevent that the air current from advancing along the straight line, takes place to turn to fast when the air current passes the diversion hole, and the powder is because inertia effect and air current separation, the air current discharges along the outlet duct, the powder after the separation flows back to in depositing the powder case along the powder section under the action of gravity to realize the disengaging process of air current and powder, be favorable to avoiding more air to get into and deposit the powder case and then carry the powder from the air inlet exhaust condition.

Optionally, the separation plate is detachably connected to the separation section.

Through adopting above-mentioned technical scheme, the separator plate can be dismantled and set up in the disengagement section, if the condition of jam appears after long-time the use in the separator plate, is convenient for directly tear it out and clear up.

Optionally, at least two separating plates are arranged, the separating plates are arranged at intervals along the axial direction of the separating section, and the directions of the turning holes in two adjacent separating plates are intersected.

Through adopting above-mentioned technical scheme, set up two and more than two separation plates for the air current can turn to many times fast, is favorable to improving the separation effect of powder and air current.

Optionally, all the separation plates are connected into a whole.

Through adopting above-mentioned technical scheme, all separation plates set up to an organic whole, at the in-process of installation or dismantlement, can operate all separation plates, avoid appearing the condition of installing or dismantling one by one, improve the simple operation nature.

Optionally, an impurity filter screen is arranged in the powder section.

Through adopting above-mentioned technical scheme, when powder recovery mechanism was in the absorption air powder, probably with the other impurity of air, like wastepaper, fibre class impurity, impurity filter screen can reduce impurity and get into and deposit the powder case in, is favorable to avoiding impurity to adhere to and leads to influencing the printing quality on the paper.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by arranging the movable baffle and the driving piece, the size of the powder outlet of the nozzle can be adjusted, the flow velocity of the sprayed air flow is reduced under the condition of increasing the powder spraying flow, and the condition that the powder is raised due to the increase of the air flow velocity is favorably avoided;

2. by arranging the powder recovery assembly, resources are saved, cost is reduced, and the situation that powder is attached to internal parts and influences normal work of the parts is reduced;

3. through setting up separation plate and outlet duct to absorptive air current and powder separation when retrieving the powder are favorable to avoiding more air to get into and deposit the powder case then carry the powder from the air inlet exhaust condition.

Drawings

FIG. 1 is a schematic cross-sectional view of a four-color printing press according to an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of the powder spray mechanism of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the powder spray mechanism of FIG. 1 from another perspective;

fig. 4 is an enlarged schematic view at a in fig. 3.

Description of reference numerals: 1. a body; 2. a feeding mechanism; 3. a printing mechanism; 4. a discharging mechanism; 5. a powder spraying mechanism; 51. a powder storage box; 511. an air inlet; 512. an air inlet pipe; 52. a nozzle; 521. fixing a baffle plate; 522. a movable baffle; 523. a powder outlet; 524. a drive member; 525. a support; 53. a powder conveying pipe; 54. a first air pump; 6. a powder recovery mechanism; 61. a powder suction cover; 62. a recovery pipe; 621. a branch pipe section; 622. a separation section; 623. a powder segment; 63. a second air pump; 64. a gas-powder separation assembly; 641. an air outlet pipe; 642. a separation plate; 643. a turning hole; 644. a support; 645. a cylindrical groove; 646. an impurity filter screen; 7. a delivery channel.

Detailed Description

The present application is described in further detail below with reference to figures 1-4. The embodiment of the application discloses a four-color printing machine. Referring to fig. 1 and 2, a four-color printing machine includes a machine body 1, a feeding mechanism 2 disposed inside the machine body 1, a printing mechanism 3, a discharging mechanism 4, a powder spraying mechanism 5, and a powder recycling mechanism 6, the printing mechanism 3 is disposed between the feeding mechanism 2 and the discharging mechanism 4, a conveying passage 7 for printed paper to pass through is disposed between the printing mechanism 3 and the discharging mechanism 4, and the powder spraying mechanism 5 is disposed above the conveying passage 7. The powder spraying mechanism 5 includes a powder storage tank 51 for storing powder, a nozzle 52 facing the conveying path 7, a powder conveying pipe 53 connected between the powder storage tank 51 and the nozzle 52, and a first air pump 54 provided on the powder conveying pipe 53. Deposit whitewashed case 51 fixed mounting in the inside top surface of organism 1, deposit whitewashed case 51's upper end and seted up air inlet 511, air inlet 511 department is equipped with intake pipe 512, intake pipe 512 runs through organism 1 and stretches out to the organism 1 outside. The first air pump 54 is fixedly installed on the side wall inside the machine body 1, the nozzle 52 is an air knife in the shape of a bar-shaped square column, two ends of the nozzle 52 along the length direction thereof are fixed on two side walls inside the machine body 1, and the orientation of the nozzle 52 is vertical downward.

The paper to be printed enters the machine body 1 through the feeding mechanism, then is printed through the printing mechanism 3, and is conveyed to the discharging mechanism 4 along the conveying channel 7 after being printed. When passing through conveying passage 7, under the effect of first air pump 54, deposit the outside air of powder case 51 and get into through intake pipe 512 and deposit in the powder case 51, then the air mixes with the powder, and the air carries the powder and carries to nozzle 52 department along defeated powder pipe 53, then sprays to the surface of paper from nozzle 52 department to avoid appearing the condition that the printing ink on paper surface adheres at its upper paper back, be favorable to improving printing quality.

The lower end of the nozzle 52 is fixedly provided with a fixed baffle 521 and a movable baffle 522 parallel to the fixed baffle 521, the fixed baffle 521 and the movable baffle 522 are arranged at intervals along the paper conveying direction, and a powder outlet 523 is formed between the fixed baffle 521 and the movable baffle 522. The movable baffle 522 is connected to the nozzle 52 in a sliding manner along the paper conveying direction, a support 525 is bolted to one side of the nozzle 52, the driving member 524 is supported and fixed by the support 525, the driving member 524 is a common air cylinder, and the output end of the driving member 524 is connected to one side of the movable baffle 522 far away from the fixed baffle 521, so that the movable baffle 522 can be close to or far away from the fixed baffle 521 under the driving of the air cylinder, namely, the width of the powder outlet 523 is controlled by the driving member 524. Two opposite side surfaces of the fixed baffle 521 and the movable baffle 522 are inclined and oppositely arranged, and the upper end of the side surface of the fixed baffle 521 is closer to the movable baffle 522 than the lower end of the side surface, so that the powder outlet 523 is arranged in a gradually expanding manner in a vertical downward direction.

If the paper is transported at a high speed and the powder ejected from the nozzle 52 is small, the partial area on the paper is free of powder, and therefore, it is necessary to increase the amount of powder ejected from the powder outlet 523 per unit time, that is, to increase the air flow rate. It is common to increase the vane speed of the first air pump 54, and the increase of the vane speed increases the air flow rate, and the flow rate of the whole air increases because the valve opening of the first air pump 54 is kept constant. After the air flow rate is increased, when the air is discharged from the powder outlet 523 and contacts and impacts the paper, a turbulent flow is easily formed at the paper, and the powder is raised in the area where the powder is sprayed under the influence of the turbulent flow, so that the powder on the paper is not uniformly distributed, and the ink can still contaminate the back of the paper. The width of the powder outlet 523 is adjustable, after the rotating speed of the blades of the first air pump 54 is increased, an operator can control the driving part 524 to increase the cross-sectional area of the powder outlet 523, and the air flow rate is unchanged, so that the flow rate of the air is reduced, and the turbulent flow caused by the high air flow rate is avoided.

Referring to fig. 2 and 3, the powder recovery mechanism 6 includes two powder suction covers 61 facing to two sides of the powder storage tank 51, respectively, a recovery pipe 62 connected between the powder suction covers 61 and the powder storage tank 51, a second air pump 63, and an air-powder separation assembly 64, and the dust suction covers are horn-shaped and located obliquely above two sides of the suction nozzle 52. The recycling pipe 62 comprises two branch pipe sections 621 connected to the powder suction cover 61, a horizontally arranged separating section 622 and a powder section 623 connected between the separating section 622 and the powder storage tank 51, wherein one end of the branch pipe section 621, which is far away from the powder suction cover 61, extends out of the machine body 1 and is connected to the separating section 622, the powder section 623 is vertically arranged, and the upper end of the powder section 623 is connected to the separating section 622.

Referring to fig. 3 and 4, the gas-powder separating assembly 64 includes a gas outlet pipe 641 horizontally connected to an end of the separating section 622, and four separating plates 642 disposed in the separating section 622, wherein the four separating plates 642 are disposed at equal intervals along a pipeline direction of the separating section 622. Each separating plate 642 is provided with a plurality of obliquely arranged turning holes 643 penetrating through the separating plate 642, and the directions of the turning holes 643 on two adjacent separating plates 642 are intersected. A bracket 644 is fixedly connected between two adjacent separation plates 642, and the bracket 644 is connected to the outer circumferential surface of the separation plate 642, so that the four separation plates 642 are connected into a whole under the action of the bracket 644. The outer diameter of the separating plate 642 is larger than the inner diameter of the separating section 622, a cylindrical groove 645 is formed in the separating section 622 from the end part to the direction far away from the air outlet pipe 641, and the four separating plates 642 are placed in the cylindrical groove 645. One end of the separation section 622, which is provided with the separation plate 642, is flanged with the outlet pipe 641, and the inner diameter of the outlet pipe 641 is consistent with that of the separation section 622, so that the outlet pipe 641 can limit the movement of the separation plate 642 in the horizontal direction. The powder section 623 is provided with an impurity filter screen 646, and the aperture of the impurity filter screen 646 is larger than the diameter of the powder particles, so that part of impurities, such as paper scraps, fiber impurities and the like, can be conveniently separated from the powder.

After the second air pump 63 is started, the powder suction cover 61 sucks the air doped with powder in the machine body 1 into the recovery pipe 62 (see fig. 2), the air moves from the branch pipe section 621 to the separation section 622, when the air passes through the separation plate 642, the air can quickly turn when entering the turning hole 643 due to the inclined arrangement of the turning hole 643, the powder impacts the separation plate 642 due to the inertia effect and then drops into the powder section 623 below under the gravity effect, and the air is discharged to the outside of the machine body 1 along the air outlet pipe 641, so that the separation process of the air and the powder is completed. Two, three, or four separating plates 642 may be provided, and four separating plates 642 are provided in total in this embodiment. Through setting up a plurality of separation plates 642, the air that has the powder of mixing can take place to turn to many times when four separation plates 642 in proper order to can carry out the separation many times to air and powder, be favorable to improving the separation effect.

If the separation plate 642 is blocked by the turning hole 643 after a long time of operation, an operator can detach and separate the air outlet pipe 641 and the separation section 622, and then the operator can take out the separation plate 642 from the separation section 622, so that the separation plate 642 can be cleaned.

The implementation principle of the embodiment is as follows: by arranging the movable baffle 522 and the driving piece 524 for driving the movable baffle 522 to move, the size of the cross section area of the powder outlet 523 can be adjusted, and when the air flow is increased, the flow velocity of the sprayed air is reduced, so that the situation that the powder on the paper is lifted due to the fact that the air flow velocity is high is avoided; by arranging the powder recovery assembly, the powder scattered outside the paper is absorbed back into the powder storage box 51, so that the resource is saved, and the probability that the powder is attached to other parts to influence the normal operation of the parts can be reduced; by arranging the separating plate 642 and the air outlet pipe 641, air is quickly turned when passing through the separating plate 642, so that the air is separated from the powder, and the condition that the air enters the powder storage box 51 and then is discharged from the air inlet 511 with the powder is avoided; through the arrangement of the plurality of separating plates 642 arranged at intervals, the air is deflected for a plurality of times through the separating plates 642, so that the separating effect of the air and the powder is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a four-color printing machine, includes feed mechanism (2), printing mechanism (3), discharge mechanism (4) and powder spraying mechanism (5), powder spraying mechanism (5) including deposit powder case (51), one end connect in deposit powder case (51) defeated powder pipe (53), connect in defeated powder pipe (53) nozzle (52) of the other end and set up in defeated powder pipe (53) on first air pump (54), deposit powder case (51) and be equipped with air inlet (511), its characterized in that: the powder spraying device is characterized in that a fixed baffle (521) and a movable baffle (522) parallel to the fixed baffle (521) are arranged at the nozzle (52), a powder outlet (523) is formed between the fixed baffle (521) and the movable baffle (522), and a driving piece (524) used for driving the movable baffle (522) to be close to or far away from the fixed baffle (521) is arranged at the movable baffle (522).

2. A four-color printing press according to claim 1, wherein: the powder outlet (523) is arranged in a direction from the inside of the nozzle (52) to the outside in a gradually expanding manner.

3. A four-color printing press according to claim 1, wherein: four-color printing machine still includes powder recovery mechanism (6), powder recovery mechanism (6) including inhale powder cover (61), one end connect in inhale recovery tube (62), second air pump (63) of powder cover (61), the other end of recovery tube (62) connect in deposit powder case (51).

4. A four-color printing press according to claim 3, wherein: the recycling pipe (62) comprises a separating section (622) which is horizontally arranged and a powder section (623) which is connected between the separating section (622) and the powder storage tank (51), the powder section (623) is connected to the lower end of the separating section (622), the powder recycling mechanism (6) further comprises a gas-powder separating assembly (64), the gas-powder separating assembly (64) comprises a gas outlet pipe (641) which is horizontally connected to one end, far away from the powder suction cover (61), of the separating section (622) and a separating plate (642) which is arranged in the separating section (622), and a plurality of turning holes (643) which penetrate through the separating plate (642) are formed in the separating plate (642).

5. A four-color printing press according to claim 4, wherein: the separating plate (642) is detachably connected to the separating section (622).

6. A four-color printing press according to claim 5, wherein: at least two separating plates (642) are arranged, the separating plates (642) are arranged at intervals along the axial direction of the separating section (622), and the directions of the direction-changing holes (643) on two adjacent separating plates (642) are intersected.

7. A four-color printing press according to claim 6, wherein: all the separating plates (642) are connected into a whole.

8. A four-color printing press according to claim 4, wherein: an impurity filter screen (646) is arranged in the powder section (623).

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