Water return device for fountain of printing machine

Abstract

The utility model relates to a printing machine fountain backwater device which comprises a water disc, a water inlet groove, a water inlet pipe, a backwater pipe and a sleeve, the backwater pipe is installed inside the water disc and at the lower end of the same side of the water inlet groove, the backwater pipe is obliquely installed below the water disc, the upper end opening portion of the backwater pipe is located on the outer side of the water inlet groove, and an annular step is designed on the upper end opening portion of the backwater pipe. The lower end of the sleeve is installed on the annular step of the inclined water return pipe, and the upper end of the sleeve is obliquely located in the water disc and inclines towards one side of the water inlet groove. The water return pipe has the advantages that the design is ingenious, the structure is reasonable and compact, the water return pipe and the upper-end sleeve are obliquely mounted, the inlet of the sleeve faces the water flow direction, water flow can quickly flow into the sleeve and the water return pipe, the oblique design ensures that the water flow flows downwards along one side of the pipe wall, the upper end of the pipe can emit air, the air suffocation phenomenon is effectively prevented, and smooth water return is ensured.

Description

Technical Field

[0001] This utility model relates to the field of printing presses, specifically to a water return device for a printing press water tank. Background Technology

[0002] Currently, in printing presses, the printing cylinder needs to transfer wetting solution from a water tank via a water jet roller. The water jet roller rotates above the water tank, with its lower end in contact with the wetting solution. This requires a continuous supply of wetting solution to the water tank to ensure the water level fluctuates within a set range. Therefore, the supply and return water speeds need to be roughly the same. The supply method is generally pumping, with gravity return. Currently, there are two problems: turbulent water flow during supply and poor return water flow. Firstly, the pumped water supply has a certain water pressure, supplying water from one end and returning it from the other. The turbulence caused by the water supply can easily cause the water roller to splash and overflow unstable water, leading to printing defects. Secondly, the current return water pipe uses gravity to return water. When the wetting solution overflows into the inlet of the return water pipe, if the overflow is large, the inlet will suddenly fill with water. Since the return water pipe relies on gravity to return water, air needs to be vented from the inlet. When the inlet is full of water, it will trap air, resulting in poor venting, slow water return or water return stopping. This causes excessive water accumulation in the water pan, resulting in water overflowing from the water pan and causing printing defects. This requires constant manual handling, which is time-consuming and labor-intensive. Summary of the Invention

[0003] To address the aforementioned problems, this utility model proposes a water return device for a printing press water tank. The device features an ingenious design and a reasonable, compact structure, solving the problem of air trapped during gravity-driven water return.

[0004] The technical solution of this utility model:

[0005] The water return device for a printing press includes a water pan, an inlet trough, an inlet pipe, a return pipe, and a sleeve. The inlet trough is installed inside the water pan on one side. The inlet pipe is installed at the lower end of the inlet trough near the center of the water pan. An inlet is designed on the side of the inlet trough away from the center of the water pan. The inlet trough is connected to the inside of the water pan through the inlet. The return pipe is installed inside the water pan and at the lower end of the same side as the inlet trough. The return pipe is installed at an angle below the water pan. The upper end of the return pipe is located outside the inlet trough. The upper end of the return pipe is designed with an annular step. The lower end of the sleeve is installed on the annular step of the angled return pipe. The upper end of the sleeve is angled inside the water pan and the angled direction is towards the inlet trough.

[0006] The water tray is rectangular in shape, with an arc-shaped bottom surface on the lower end of the water tray near the printing press water drum roller. The side plates of the water tray also have arc-shaped grooves to avoid the printing press water drum roller.

[0007] The water tray is equipped with mounting plates on both sides at the lower end, and the mounting plates are designed with two waist-shaped holes.

[0008] A cover plate is installed inside the water inlet tank, and the cover plate is located above the opening of the water inlet pipe.

[0009] The water inlet trough includes a side plate and a long baffle. One end of the side plate is perpendicularly connected to one end of the long baffle. The other ends of the side plate and the long baffle are respectively connected to the two sides of the inner corner of the water tray to form a water inlet trough. A water inlet is opened at the bottom of the end of the long baffle away from the side plate.

[0010] The height of the inlet tank wall is lower than the height of the inner wall of the water pan, and the height of the inlet tank wall is the same as the maximum height of the sleeve extending into the water pan.

[0011] The water inlet pipe is also installed at an angle at the lower end of the water pan.

[0012] The inclination angle of the sleeve is 20-80 degrees.

[0013] Furthermore, the inclination angle of the sleeve is 30-60 degrees.

[0014] The advantages of this utility model are its ingenious design and reasonable and compact structure. By installing the return pipe and the upper sleeve at an angle, the inlet of the sleeve faces the direction of water flow, allowing water to flow quickly into the sleeve and the return pipe. The angled design ensures that the water flows down one side of the pipe wall, while air can escape from the upper end of the pipe, effectively preventing air stagnation and ensuring smooth return water flow. Attached Figure Description

[0015] Figure 1 This is a top view of the present invention.

[0016] Figure 2 yes Figure 1 Vertical sectional view at point AA.

[0017] Figure 3 yes Figure 1 Vertical sectional view at point BB. Detailed Implementation

[0018] Referring to the attached diagram, the water return device for the printing press includes a water pan 1, an inlet trough 2, an inlet pipe 3, a return pipe 4, and a sleeve 5. The inlet trough 2 is installed on one side inside the water pan 1. The inlet pipe 3 is installed at the lower end of the side of the inlet trough 2 near the middle of the water pan 1. An inlet 7 is designed on the side of the inlet trough 2 away from the middle of the water pan 1. The inlet trough 2 is connected to the interior of the water pan 1 through the inlet 7. The return pipe 4 is installed at the lower end of the water pan 1 on the same side as the inlet trough 2. The return pipe 4 is installed at an angle below the water pan 1. The upper end of the return pipe 4 is located outside the inlet trough 2. The upper end of the return pipe 4 is designed with an annular step. The lower end of the sleeve 5 is installed on the annular step of the inclined return pipe 4. The upper end of the sleeve 5 is inclined inside the water pan 1 and the inclined direction is towards the side of the inlet trough 2.

[0019] The water tray 1 is a rectangular tray. The lower end of the water tray 1, which is close to the water drum roller of the printing machine, has an arc-shaped bottom surface 11. The two side plates of the water tray 1 also have arc-shaped grooves 12 to avoid the water drum roller of the printing machine.

[0020] The water tray 1 is equipped with mounting plates 8 on both lower ends, and the mounting plates 8 are designed with two waist-shaped holes.

[0021] A cover plate 9 is installed inside the water inlet tank 2, and the cover plate 9 is located above the opening of the water inlet pipe 3.

[0022] The water inlet trough 2 includes a side plate 21 and a long baffle 22. One end of the side plate 21 is perpendicularly connected to one end of the long baffle 22. The other ends of the side plate 21 and the long baffle 22 are respectively connected to the two sides of the inner corner of the water tray to form the water inlet trough 2. A water inlet 7 is opened at the bottom of the end of the long baffle away from the side plate.

[0023] The wall height of the water inlet trough 2 is lower than the inner wall height of the water pan 1, and the wall height of the water inlet trough 2 is the same as the maximum height of the sleeve 5 extending into the water pan 1. The side plates and long baffles of the water inlet trough are designed to be lower than the height of the water pan to prevent direct overflow to the outside of the water pan. If the water level is too high, it will overflow directly from above the long baffles and side plates into the water pan and quickly enter the return water pipe, accelerating the return flow.

[0024] The inlet pipe 3 is also installed at an angle at the lower end of the water pan 1. The angled design of the inlet pipe is parallel to the return pipe, firstly for aesthetic reasons, and secondly to guide the inlet pipe to the side wall panel for easy fixing of the pipe on the wall panel.

[0025] The inclination angle of the sleeve 5 is 20-80 degrees. Further, the inclination angle of the sleeve 5 is 30-60 degrees.

[0026] In use, the water tray of this invention is installed below the water jet roller of the printing press via a mounting plate. Water begins to enter through the inlet pipe, and a cover plate blocks the water inlet to prevent splashing. The water flows along the inlet groove to the outermost inlet position and enters the water tray through the inlet. The water flow flows from one side of the inlet to the other side of the water tray. The return pipe is located on the other side of the water tray, and the water flows towards the return pipe. The water level in the water tray slowly accumulates to the opening of the sleeve. If the water level continues to rise, water flows into the opening of the sleeve and flows down along the lower side of the inclined inner wall of the sleeve. The upper side of the inner wall of the sleeve can expel air from the pipe to prevent air stagnation. Even if the water flow suddenly increases and instantly fills the opening of the sleeve, the inclined angle design of the sleeve ensures that the water flows down slowly and does not cause air stagnation in the pipe, making it safe and reliable.

Claims

1. A water return device for a printing press water tank, characterized in that, It includes a water pan, an inlet trough, an inlet pipe, a return pipe, and a sleeve. The inlet trough is installed inside the water pan on one side. The inlet pipe is installed at the lower end of the inlet trough near the middle of the water pan. An inlet is designed on the side of the inlet trough away from the middle of the water pan. The inlet trough is connected to the inside of the water pan through the inlet. The return pipe is installed inside the water pan and at the lower end of the same side as the inlet trough. The return pipe is installed at an angle below the water pan. The upper end of the return pipe is located outside the inlet trough. The upper end of the return pipe is designed with an annular step. The lower end of the sleeve is installed on the annular step of the angled return pipe. The upper end of the sleeve is angled inside the water pan and the angled direction is towards the inlet trough.

2. The water return device for the printing press water tank according to claim 1, characterized in that, The water tray is rectangular in shape, with an arc-shaped bottom surface on the lower end of the water tray near the printing press water drum roller. The side plates of the water tray also have arc-shaped grooves to avoid the printing press water drum roller.

3. The water return device for a printing press water tank according to claim 1, characterized in that, The water tray is equipped with mounting plates on both sides at the lower end, and the mounting plates are designed with two waist-shaped holes.

4. The water return device for a printing press water tank according to claim 1, characterized in that, A cover plate is installed inside the water inlet tank, and the cover plate is located above the opening of the water inlet pipe.

5. The water return device for a printing press water tank according to claim 1, characterized in that, The water inlet trough includes a side plate and a long baffle. One end of the side plate is perpendicularly connected to one end of the long baffle. The other ends of the side plate and the long baffle are respectively connected to the two sides of the inner corner of the water tray to form a water inlet trough. A water inlet is opened at the bottom of the end of the long baffle away from the side plate.

6. The water return device for a printing press water tank according to claim 1, characterized in that, The height of the inlet tank wall is lower than the height of the inner wall of the water pan, and the height of the inlet tank wall is the same as the maximum height of the sleeve extending into the water pan.

7. The water return device for a printing press water tank according to claim 1, characterized in that, The water inlet pipe is also installed at an angle at the lower end of the water pan.

8. The water return device for a printing press water tank according to claim 1, characterized in that, The inclination angle of the sleeve is 20-80 degrees.

9. The water return device for a printing press water tank according to claim 8, characterized in that, The inclination angle of the sleeve is 30-60 degrees.

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