An automatic ink supply device for a printing press

Abstract

The utility model relates to printing machine ink supply device technical field discloses a printing machine automatic ink supply device, include: ink storage jar, discharge pipe and reflux pipe, ink storage jar bottom one side is equipped with discharge pipe, ink storage jar top one side is equipped with reflux pipe, discharge pipe one end is equipped with three -way valve, the fixed ring is fixed in the ink storage jar inner wall, the fixed ring top is equipped with lower filter hopper, upper material blocking ring board is equipped in lower filter hopper top surface, lower filter hopper upper half part side wall is equipped with filter screen board, the inner ring of upper material blocking ring board is equipped with annular baffle, the utility model discloses whole ink supply device through the filtration of upper material blocking ring board and lower filter hopper, can realize the filtration of ink in the ink circulation process, avoid the fine impurity in the ink deposition in the pipeline, guarantee the smooth of ink supply.

Description

Technical Field

[0001] This utility model relates to the technical field of ink supply devices for printing presses, specifically an automatic ink supply device for printing presses. Background Technology

[0002] Automatic ink supply systems in printing presses are core systems used in modern printing equipment to achieve automatic, stable, and precise ink supply. Through a combination of mechanical, electronic, and hydraulic technologies, they ensure the continuity, uniformity, and controllability of ink during the printing process, thereby improving print quality, efficiency, and stability.

[0003] For example, an existing Chinese patent (CN213891812U) discloses an automatic ink supply device for a printing press, including a base plate. An ink tank is fixedly connected to one side of the base plate, and an ink inlet is provided on one side of the ink tank. A motor is fixedly connected to one side of the ink tank, and a rotating shaft is fixedly connected to the output end of the motor. A stirring blade is fixedly connected to the outer surface of the rotating shaft. A first water level sensor is provided on the inner wall of the ink tank, and an alarm is provided on one side of the ink tank. The advantages of this invention are: through the coordinated arrangement of the ink tank, motor, rotating shaft, stirring blade, first water level sensor, and alarm, the alarm reminds the user to add ink to the ink tank; the motor, rotating shaft, and stirring blade ensure that the ink does not condense; the size of the ink tank is much larger than the size of the storage ink tank, eliminating the need for frequent ink refills; the operation is simple; and the time saved on ink refills ensures uninterrupted printing, thus improving printing efficiency.

[0004] However, in the above-mentioned automatic ink supply device for printing presses, due to the lack of a filtration structure, fine impurities in the ink, such as pigment particle agglomeration, filler sedimentation, colloidal foreign matter, or external contaminant particles, are prone to deposit or blockage at the narrow cross-section of the ink supply pipe, resulting in ink flow interruption and uneven ink distribution, ultimately causing quality defects such as light ink color, streaks, and broken lines in the printed matter. Utility Model Content

[0005] The purpose of this invention is to provide an automatic ink supply device for a printing press to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an automatic ink supply device for a printing press, comprising: an ink storage tank, a discharge pipe, and a return pipe. The discharge pipe is provided on one side of the bottom of the ink storage tank, and the return pipe is provided on one side of the top of the ink storage tank. A three-way valve is provided at one end of the discharge pipe. A fixing ring is fixed to the inner wall of the ink storage tank. A lower filter hopper is provided at the top of the fixing ring. An upper baffle ring is provided on the top surface of the lower filter hopper. A filter screen is provided on the upper half of the side wall of the lower filter hopper. An annular baffle is provided on the inner ring of the upper baffle ring.

[0007] Furthermore, the ink storage tank is provided with a sealing cap at the top, a stirring motor is provided at the center of the top of the sealing cap, a stirring shaft is fixed at the bottom of the output shaft of the stirring motor, a stirring rod is fixed on the outer wall of the stirring shaft, and a feed valve is provided on one side of the top of the sealing cap.

[0008] Furthermore, a discharge pump is provided in the middle of the discharge pipe, one end of the return pipe is connected to one end of the three-way valve, one end of the three-way valve is provided with a connecting pipe, and the outlet direction of one end of the return pipe is tangent to the inner wall of the ink storage tank.

[0009] Furthermore, the upper baffle ring is located below one end of the return pipe outlet.

[0010] Furthermore, the lower half of the lower filter hopper is cylindrical, and the bottom of the lower filter hopper is rotatably connected to the stirring shaft.

[0011] Furthermore, the top of the filter screen is provided with a flange, and the bottom surface of the flange is engaged with the top surface of the fixing ring.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This utility model, through the setting of an ink storage tank, an upper baffle ring plate, and a lower filter bucket, enables the printing ink in the ink storage tank to be delivered to the connecting pipe through the delivery pump when the automatic ink supply device of the printing press is in use. The ink is then delivered to the connecting pipe in conjunction with the connection of the delivery pipe and the three-way valve. The connecting pipe is connected to the ink fountain to realize the automatic ink supply of the printing press. During the ink supply process, the valve between the return pipe and the three-way valve is in the closed state.

[0014] After ink supply is complete, close the valve between the three-way valve and the connecting pipe, and open the valve between the return pipe and the three-way valve. The ink is then conveyed by the discharge pump and returned to the ink storage tank through the return pipe. This prevents ink from settling and clumping in the discharge pipe due to prolonged stagnation. Simultaneously, the returned ink enters the ink storage tank tangentially. Impurities in the ink move towards the inner wall of the ink storage tank under centrifugal force, with some adhering to the inner wall. Subsequently, guided by the upper baffle ring, the ink passes over the ring baffle and enters the lower filter hopper. Some impurities settle on the inner side of the ring baffle, while the ink entering the lower filter hopper settles at the bottom first, then gradually passes over the filter screen and is filtered by the filter screen before re-entering the ink storage tank for stirring.

[0015] The entire ink supply device filters the ink during the ink circulation process through the upper baffle ring and the lower filter hopper, preventing fine impurities in the ink from accumulating in the pipes and ensuring smooth ink supply.

[0016] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0017] Figure 1 This is a perspective view of an automatic ink supply device for a printing press according to the present invention;

[0018] Figure 2 This is a perspective view of an automatic ink supply device for a printing press according to the present invention.

[0019] Figure 3 This is a main sectional view of an automatic ink supply device for a printing press according to the present invention;

[0020] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle.

[0021] In the diagram: 1. Ink reservoir; 2. Sealing cap; 3. Stirring motor; 4. Feed valve; 5. Discharge pipe; 6. Discharge pump; 7. Three-way valve; 8. Connecting pipe; 9. Return pipe; 10. Stirring shaft; 11. Stirring rod; 12. Upper baffle ring; 13. Lower filter hopper; 14. Annular baffle; 15. Filter screen; 16. Fixing ring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figures 1-4 This utility model provides a technical solution: an automatic ink supply device for a printing press, comprising: an ink reservoir 1, a discharge pipe 5, and a return pipe 9. The discharge pipe 5 is located on one side of the bottom of the ink reservoir 1, and the return pipe 9 is located on one side of the top of the ink reservoir 1. A three-way valve 7 is located at one end of the discharge pipe 5. One end of the discharge pipe 5 is welded to the bottom side wall of the ink reservoir 1, and the other end is sequentially connected to a discharge pump 6 and the three-way valve 7. The three ports of the three-way valve 7 are respectively connected to the discharge pipe 5, the return pipe 9, and a connecting pipe 8. The discharge pump 6 provides stable pressure to ensure that the ink is delivered to the ink fountain at a constant flow rate, avoiding uneven ink density in the printed matter due to pressure fluctuations.

[0024] The three-way valve 7 switches between ink supply and reflux modes by changing the valve direction, allowing ink circulation to be completed without disassembling the pipeline, making it easy to operate.

[0025] A fixing ring 16 is fixed to the inner wall of the ink storage tank 1. A lower filter hopper 13 is located at the top of the fixing ring 16. An upper baffle ring 12 is located on the top surface of the lower filter hopper 13. A filter screen 15 is located on the upper half of the side wall of the lower filter hopper 13. An annular baffle 14 is located on the inner ring of the upper baffle ring 12. The upper baffle ring 12 is horizontally fixed to the inner wall of the ink storage tank 1, located below the outlet of the return pipe 9. Its inner ring extends vertically upward to form an annular baffle 14, guiding the return ink to flow downward. The side wall of the filter screen 15 in the upper half of the lower filter hopper 13 is inclined at a 45° angle, and the lower half is cylindrical. The bottom is rotatably connected to the stirring shaft 10 through a bearing. The filter screen 15 covers the conical side wall, and its flange is engaged with the fixing ring 16. This increases the filtration area, improves the throughput per unit time, and causes impurities to accumulate to the bottom under gravity.

[0026] The filter screen 15 intercepts fine impurities with a particle size >20μm, such as undispersed pigment particles, to prevent them from entering the discharge pipe 5 and causing blockage.

[0027] The annular baffle 14 forms a static separation zone, which causes large particles of impurities to settle on the inside of the baffle, preventing them from being re-entered into the ink cycle.

[0028] A sealing cap 2 is located at the top of the ink reservoir 1. The sealing cap 2 is bolted to the top of the ink reservoir 1, forming a sealed space to prevent ink evaporation or the entry of external contaminants. A stirring motor 3 is located at the center of the top of the sealing cap 2. A stirring shaft 10 is fixed to the bottom of the output shaft of the stirring motor 3, and stirring rods 11 are fixed to the outer wall of the stirring shaft 10. A feed valve 4 is located on one side of the top of the sealing cap 2. The stirring motor 3 is fixed to the center of the top of the sealing cap 2, and its output shaft passes through the sealing cap 2 and is rigidly connected to the stirring shaft 10. Multiple sets of stirring rods 11 are spirally distributed on the outer wall of the stirring shaft 10. Continuous stirring prevents pigment particles in the ink from settling, maintains ink uniformity, and avoids fluctuations in ink concentration due to stratification. The shear force generated by stirring can break up initially agglomerated impurity particles, reducing the load on subsequent filtration. The feed valve 4 is installed on one side of the top of the sealing cap 2 and is connected to an external ink supply pipeline via a threaded interface. The closed-loop ink filling design reduces ink exposure time and prevents impurities from entering. Valve control enables quantitative ink replenishment, preventing overflow during stirring due to excessively high ink levels in the ink reservoir 1.

[0029] A discharge pump 6 is located in the middle of the discharge pipe 5. One end of the return pipe 9 is connected to one end of a three-way valve 7. A connecting pipe 8 is provided at one end of the three-way valve 7. The outlet direction of one end of the return pipe 9 is tangential to the inner wall of the ink storage tank 1. One end of the return pipe 9 is connected to the three-way valve 7, and the other end is inserted tangentially into the side wall of the ink storage tank 1, at a height of 1 / 3 from the top of the tank. The tangential return flow causes the ink to form a swirling flow, using centrifugal force to throw impurities towards the tank wall, achieving preliminary solid-liquid separation. This reduces the amount of impurities suspended in the center of the tank, reducing the load on the subsequent filtration system.

[0030] The upper baffle ring 12 is located below one end of the outlet of the return pipe 9.

[0031] The lower half of the lower filter hopper 13 is cylindrical, and the bottom of the lower filter hopper 13 is rotatably connected to the stirring shaft 10. The top of the filter screen 15 has a flange, the bottom surface of which engages with the top surface of the retaining ring 16. The retaining ring 16 is welded to the inner wall of the ink reservoir 1, and its top surface has an annular groove, which is bolted to the flange of the filter screen 15. The quick-disassembly design facilitates regular cleaning or replacement of the filter screen 15, reducing maintenance costs. The snap-fit ​​structure provides a strong seal, preventing ink leakage from the interface.

[0032] When the automatic ink supply device of the printing press is in use, the printing ink in the ink tank 1 is delivered by the discharge pump 6, and in conjunction with the connection of the discharge pipe 5 and the three-way valve 7, it is delivered to the connecting pipe 8. The connecting pipe 8 is connected to the ink fountain to realize the automatic ink supply of the printing press. During the ink supply process, the valve between the return pipe 9 and the three-way valve 7 is in the closed state.

[0033] After ink supply is completed, close the valve between the three-way valve 7 and the connecting pipe 8, and open the valve between the return pipe 9 and the three-way valve 7. The ink is conveyed by the discharge pump 6 and sent back to the ink storage tank 1 through the return pipe 9. This prevents the ink from settling and clumping in the discharge pipe 5 due to prolonged ink stagnation. At the same time, the returned ink enters the ink storage tank 1 tangentially. Impurities in the ink will move towards the inner wall of the ink storage tank 1 under the action of centrifugal force. Some of them will adhere to the inner wall of the ink storage tank 1. Then, under the guidance of the upper baffle ring plate 12, the ink passes through the annular baffle plate 14 and enters the lower filter hopper 13. Some impurities will settle inside the annular baffle plate 14. The ink entering the lower filter hopper 13 will first settle at the bottom and then gradually pass through the filter screen plate 15. After being filtered by the filter screen plate 15, it will re-enter the ink storage tank 1 for stirring.

[0034] The entire ink supply device filters the ink through the upper baffle ring 12 and the lower filter hopper 13, which can filter the ink during the ink circulation process, prevent fine impurities in the ink from depositing in the pipe, and ensure smooth ink supply.

[0035] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. An automatic ink supply device for a printing press, comprising: The ink storage tank (1), the discharge pipe (5) and the return pipe (9) are characterized in that: the ink storage tank (1) is provided with a discharge pipe (5) on one side of the bottom, and a return pipe (9) is provided on one side of the top of the ink storage tank (1). A three-way valve (7) is provided at one end of the discharge pipe (5). A fixing ring (16) is fixed on the inner wall of the ink storage tank (1). A lower filter hopper (13) is provided on the top of the fixing ring (16). An upper baffle ring plate (12) is provided on the top surface of the lower filter hopper (13). A filter screen plate (15) is provided on the upper half side wall of the lower filter hopper (13). An annular baffle plate (14) is provided in the inner ring of the upper baffle ring plate (12).

2. The automatic ink supply device for a printing press according to claim 1, characterized in that: The ink storage tank (1) is provided with a sealing cover (2) at the top. A stirring motor (3) is provided at the center of the top of the sealing cover (2). A stirring shaft (10) is fixed at the bottom of the output shaft of the stirring motor (3). A stirring rod (11) is fixed on the outer wall of the stirring shaft (10). A feed valve (4) is provided on one side of the top of the sealing cover (2).

3. The automatic ink supply device for a printing press according to claim 2, characterized in that: The discharge pipe (5) is equipped with a discharge pump (6) in the middle. One end of the return pipe (9) is connected to one end of the three-way valve (7). One end of the three-way valve (7) is equipped with a connecting pipe (8). The outlet direction of one end of the return pipe (9) is tangent to the inner wall of the ink storage tank (1).

4. The automatic ink supply device for a printing press according to claim 3, characterized in that: The upper baffle ring (12) is located below one end of the outlet of the return pipe (9).

5. An automatic ink supply device for a printing press according to claim 2, characterized in that: The lower half of the lower filter bucket (13) is cylindrical, and the bottom of the lower filter bucket (13) is rotatably connected to the stirring shaft (10).

6. The automatic ink supply device for a printing press according to claim 5, characterized in that: The filter screen (15) has a flange at the top, and the bottom surface of the flange is engaged with the top surface of the fixing ring (16).

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