Matters needing attention when operating a hydraulic paper cutter

To make the cutting edge of the paper flat, it is necessary to ensure that the cutting edge of the cutter blade is sharp and the sharpening angle is appropriate. When cutting soft paper, the blade sharpening angle of 16 ° is appropriate; when cutting cardboard, kraft paper, the blade sharpening angle of 20 ° is appropriate; when cutting commonly used printing paper, the blade sharpening angle of 21 ° is appropriate. Daily care points: in order to ensure the cutting quality of paper and printed matter, the usual demand for paper cutter to stop care,

The main points are as follows:

1. According to different seasons, choose suitable hydraulic oil. In winter, use No. 20 oil to adhere to its activity; in summer, use No. 30 oil to adhere to its certain viscosity.

2. Adhere to the right hydraulic pressure. If the pressure is too large, the sealing ring will burst; if the pressure is too small, the blade cutting will appear sluggish and weak.

3. Coat the cutting platform and blade mouth with talcum powder or paraffin wax. In doing so, one is to reduce the friction resistance between the paper and the platform, and the operation is labor-saving; the second is to extend the cutting times of the blade, and the cutting edge is smooth and uniform.

4. Add lubricating oil. Before work, add lubricating oil to the mechanical oil filling port, insist on the lubrication and cleaning of the machine, and do not produce noise, so that the paper cutter is always in good working condition. Problem: The cutting action of the paper cutter is normal, but the paper press will be slightly slower when the ball rises after the paper press is pressed down. The paper on the top surface of the cut paper stack will wrinkle against the edge of the cut (the cut paper was coated paper at that time), and the cutting surface of the cut paper stack will form an arc surface. Obviously, cutting out such a product is not able to meet the quality requirements.

1. The cutting edge of the cutter is worn, which affects the cutting performance

2. The front face of the paper pusher is not perpendicular to the surface of the worktable, which affects the verticality of cutting

3. It affects the cutting performance. The copper sleeve shaft hole of the connecting rod (shaft) of the linkage cutter is worn, which makes the shaft and the copper sleeve hole poorly matched. When the cutter cuts, it loosens and produces a cutting tendency.

4. The lack of pressure of the paper press makes the paper on the cutter lack of pressure when cutting, but the paper (coated paper) is tough, so wrinkling deformation occurs when cutting, and the paper in the middle part is shifted and cut, thus making the cutting circle form an arc shape. Disposal: Replace the copper sleeve matched with the connecting rod shaft; According to the method introduced in the manual, the verticality between the front end face of the paper pusher and the surface of the workbench is stopped and standardized, and the angle of the cutter is sharply ground. After the disposal of these three problems, the quality of cutting has improved slightly, but it is still not a fundamental problem. In this regard, it is only necessary to find a reason for the pressure of the paper press. The working pressure of the paper press is related to many aspects such as the quality of the solenoid valve, the total oil pump, the oil circuit, the pressure cylinder and the working oil. We measured the working pressure gauge value of the paper pressure cylinder to be 6.7MPa, which is smaller than the normal working pressure of 7-0.5bPa introduced in the manual. In connection with the symptoms that the speed of the paper pressing brake is relatively slow when it rises after being pressed down, it is analyzed that the paper pressing cylinder may show defects. However, since the part where the paper pressing cylinder is installed is difficult to disassemble, we still check the solenoid valve and the main oil pump first in the process of removing the defects, and finally disassemble the paper pressing cylinder without finding any abnormality. It is found that the pressure spring in the lower valve core of the cylinder is broken. Obviously, this is the root cause of the defects. After changing the pressure spring of this broken section, the working pressure of the paper pressing cylinder returned to normal, and the cutting quality reached the quality request. Disadvantages like this have occurred many times on this paper cutter. The main reason is that the spring breaks after being used for a long time. Assuming that the number of broken turns is relatively large, the paper pressing brake will rise more slowly after being pressed down so that it cannot rise. Because of the first theoretical repair experience, so in the future such shortcomings attack, we can immediately and accurately determine the cause, the shortcomings of the faster removal.