The present invention provides a multifunctional pull faucet, comprising: a faucet body, a drawing part is provided at the water outlet port thereof, and the drawing part is connected to a main channel, wherein at least three are provided in the faucet body A branch channel, and the three branch channels are all connected to the main channel. A multifunctional pull faucet provided by the present invention, wherein the hot water channel, the cold water channel and the water purification channel (pure water channel) are all connected to the main channel , And the main channel is connected with the drawing part on the main body of the faucet, so that the drawing part can obtain the water quality (hot water, cold water, purified water or pure water) required by different users, thereby improving the user experience, and , By integrating the hot water channel, cold water channel and pure water channel (pure water channel) into the main channel, the internal structure of the faucet is simplified, and the production cost of the faucet is reduced. Pull Out Faucets,Pull Out Kitchen Tap,Pull Out Sink Faucet,Standard Pull Out Faucet Yuyao Zelin Sanitary Ware Co., Ltd , https://www.kitchen-sinkfaucets.com
In lithography practice, "dark bars" are often print quality problems that are difficult to completely solve. The production of "dark bars" involves the design of typographers, the use of materials and processing technology for mechanical parts, the operation of staff, the selection of printed materials, and the maintenance of mechanical equipment. The main reason for the production of “bars†in printing is the vibration of the printing cylinders of the typograph and the ink conveying and water conveying mechanisms during the movement of the paper or the texturing process of the paper, causing slipping of the relative positions of the prints. Therefore, our existing offset printing equipment and technology cannot eliminate the occurrence of “dark barsâ€. It is only possible to minimize and reduce the occurrence of “dark bars†by improving technology and operating processes.
1, the roller gear backlash is too large
1 Center clearance caused by the center clearance is too large.
The roller gear of the offset printing press is basically meshed with a helical gear, and the gear exchange coefficient is large, and the space of the meshing side clearance is small, so as to reduce the impact in the transmission and chattering during printing, and maintain the smoothness and accuracy of printing. In actual work, the backlash of the gears of the roller gear is changed with the printing of different thicknesses of paper. The thicker the paper is, the larger the center distance is adjusted, and the exchange coefficient of the roller gear engagement surface is relatively smaller, and the backlash becomes larger. The greater the difference between the line speeds of the surface of the printing roller, the greater the relative slip f produced by the printing surface, and the more pronounced the bar.
Solution: Under the premise of ensuring proper printing pressure, the center distance between the three rolling reductions should be reduced as much as possible, and the meshing tooth gap should be properly pressed to reduce the degree of “barsâ€.
2 The backlash caused by gear wear is too large.
After a period of working operation, the roller gear is worn due to wear or there is foreign matter in the tooth slot, resulting in excessive backlash of the gear meshing. The involute of the gear cannot be uniformly rolled along the meshing line, or the foreign object “top gear†makes the gear in operation. Chattering occurs, causing the friction between the rollers to increase and slipping. At the instant of printing, the printing graphic part generates an ink ribbon equal to the pitch of the gears, that is, a gear bar. Solution: Strengthen the cleaning and maintenance work of machinery and equipment, clean and remove the debris between gears, and maintain a good lubrication; According to the wear of gears, recalculate the center distance, press the backlash properly, and replace the badly worn ones immediately. gear.
2, bearing wear
1 rolling bearing wear.
When the offset press is used for a long period of time, especially if the rollers do not move the rollers, the impact vibration is large and the bearings are relatively easy to wear, which makes the clearance between the journal and the bearing increase and the looseness of the sleeves is reduced. The mouth quivered as a result of alienation, resulting in sliding friction forming "bars." In particular, when the load is not normal or the lubrication is not good, the shaft head and bushing of the drum wear more, and the “bar†is most likely to occur near the mouth.
Solution: The inner part of the rubber inner liner can be cut into a trapezoidal shape to reduce the impact force when the pressure is applied. When the roller bearing wears badly, the bearing should be updated.
2 Ink roller bearing wear.
Water, ink roller bearings, bearing seats, bearing locks containing debris or wear can also cause the water, ink roller in the movement of significant axial turbulence and radial runout resulting in "bars", especially 窜When the sleeve or transmission gear of the ink roller is worn out, the vibration generated due to the meshing of the roller gear affects the normal uniform water distribution, ink distribution and transmission of the roller, causing the appearance of “barsâ€.
3, ink roller wear
After the ink roller is used for a period of time, the ink roller is worn due to cleaning dust, paper, ink and other impurities, or improper installation, uneven pressure adjustment and other factors, the surface of the ink roller is uneven or the axis line is not straight. In severe cases, the ink roller has two rough middle thin or middle thick two thin deformation.
When the offset press is working, it will cause the ink roller to jump, causing the local friction to become heavier, resulting in an intermittent ribbon bar.
The cloth sleeve of the water roll is incomplete due to incomplete sewing interface, or improper inner diameter size, or loose wrinkling of the cloth cover after a long time use, or serious hair loss due to new water roll cloth cover hair removal. The occurrence of bars.
4, improper pressure adjustment
1 Improper adjustment of the pressure between the rollers.
The cylinder of the offset printing press completes the printing by relative extrusion. During the rolling process of the cylinder, the corresponding two rollers cycle from the working surface (graphic contact surface) to the neutral position, and then from the neutral position to the working surface, twice. The conversion causes the load to mutate and produce an impact. This shock causes a momentary pressure change and relative slippage at the contact surface of the printing image, resulting in a "bar."
2 Ink roller and plate cylinder pressure is not proper.
Although the layout of the four inking rollers of the offset printing press is thick and thin in the front and rear, different diameters are used to avoid overlapping of the “barsâ€, but because the four inking rollers are in contact with the printing plate in two groups, each two inking rollers are simultaneously Root roller contact. When the first inking roller comes in contact with the neutral position of the plate cylinder, the impact force causes the ink roller to be lifted up and then falls. This causes a slip between the ink roller and the inking roller, affecting the first ink. The amount of ink transferred from the roller to the plate changes, resulting in a "stick", which also affects the evenness of the second ink roller film; when the second ink roller contacts the plate cylinder in neutral, it also causes ink. The roller experiences a process of being topped up and falling down, at which point the first inking roller is in the plate, and the falling inked roller impacts the first inking roller to produce a "bar." In the same way, the third and fourth ink rollers will also produce “bars†on the printing plate, so that the whole layout will appear light and heavy “barsâ€. Solution: Regularly check the tolerance of the diameter and axis of each ink roller to ensure the normal working status of the ink roller. Adjust the pressure of each roller and printing plate accurately according to the specification order. Generally, the width of the press track can be adjusted to 5mm, 4mm, 3mm, and the axial movement of the ink roller is less than 0.3mm.
3 The pressure in the roller and the ink roller is not proper.
The ink roller of the ink-feeding part of the offset printing press basically adopts a soft-hard matching mode. When the pressure adjustment between the rollers is too large, the hard roller (the roller in the roller) and the soft roller (the ink roller and the ink roller) are seriously damaged. The extrusion, the soft roller under the pressure, the contact surface is sagging and the two sides of the micro drum affect the ink transfer to produce "bar", or when the ink exchange roller reversing time and the rolling operation does not match, the ink roller Affect the amount of ink on the roller to produce a "bar."
Solution: Install the working position of each roller in the order of specification, and accurately adjust the pressure of each roller and the ink roller. The width of the press trace is about 3-5mm. Each commutation of the ink roller should be completed within the idle time of the roller.
4 water roller pressure is not properly adjusted.
When the pressure of the water roller and the plate cylinder is too large, the impact force generated when the plate cylinder is switched between the working surface and the neutral gear causes the water roller to vibrate, and the water is not evenly distributed to generate a “barâ€. Or because of the increased friction between the water roller and the plate cylinder, the residual ink layer on the printing plate is destroyed, resulting in the destruction of the screen printing plate base and the lack of ink absorption to cause “barsâ€.
Solution: When adjusting the pressure of the water roller and the printing plate roller, insert the test pressure with a feeler gauge of 0.15-0.2 mm. It is better to feel the friction resistance but still can withdraw smoothly. The upper roller pressure should be greater than the lower roller pressure, and the two head pressures should be the same.
5, improper roller lining
In the actual work, the blanket cylinder is an elastomer and there is a slight error in the pressure. The lining thick roller is not purely rolling state, but has a certain range of sliding, prone to vibration, resulting in "bars"; when the lining is too large, the compressible rubber roller under pressure, the surface of the blanket produces Forward or backward convex bulges, excessive rubbing of the plate layout and "squeezing" occurs; when the replacement blanket is not taut or slack with a long blanket, under the printing pressure, the blanket is on the roller Slippage of the surface can also cause "bars" to appear.
Sometimes the paper is partially filled due to the shallow part of the cornice and the impact force of the drum's neutral period is increased, which can also cause "bars". Roller lining is generally soft, medium, hard, soft lining is generally not easy to appear bars, but due to the elasticity of the printing effect is not ideal and less use; hard lining printing outlets clear, but the lining elasticity Small, easy to appear "bars" on offset presses with low precision.
Solution: The drum lining must be accurately calculated to determine the thickness of the lining under the premise of ensuring the minimum printing pressure. Under the premise of ensuring that the print is clear and the dot deformation is small, the hard liner is used as far as possible. It is best to use an air-cushioned blanket.
6, transmission mechanism caused by the transfer of vibration
The offset teeth of the offset roller are generally caused by the force of the brace spring to make the grippers close and bite the paper for printing. The rollers of the clenching shaft end rotate with the roller and press the holding spring when reaching the fixed cam opening plate on the impact wall plate. When the teeth are opened, the force acting on the brace spring disappears when the roller is released from the teeth and the teeth close. During the exercise, the teeth must be opened and closed twice to complete the transfer from the delivery paper to the finished delivery. Due to the large impact generated during opening and closing, the stability of the operation of the impression cylinder is affected, resulting in the occurrence of slippage between the impression cylinders. In severe cases, "bars" appear. Similarly, the drum clutch pressure and the cam drive mechanism can also cause vibrations and produce "bars."