Safety precautions when operating open mill
Open mixer is one of the main equipment of rubber factory. The operation of rubber smelting is an accident-prone process, including personal accidents and equipment accidents.
Open mixer Applicable products:
This equipment is suitable for mixing raw rubber, and can be heated and cooled for later stage press, calendering machine, extruder or other processing machinery.
Precautions for operation of open mixer:
I. Preparation
Before starting the mixer, leather wrists must be worn, and masks should be worn during mixing operation. Waist tether, belt and rubber should be absolutely avoided. Carefully check the size of the gear and roller between the sundry. For the first start of each shift, you must pull the emergency brake device to check whether the brake is sensitive and reliable (after the empty brake, the front roller rotation shall not exceed a quarter of a turn). It is strictly forbidden to use the emergency brake device to shut down the mill during normal operation. If two or more people operate together, they must echo each other and confirm that there is no danger before they can drive.
The temperature rise speed of the roller preheating and heating should be controlled, especially in the cold winter in the north, the outside of the roller is consistent with the room temperature, and the high temperature steam is suddenly introduced into the roller. The temperature difference between the inside and outside may be above 120℃, and the temperature difference causes excessive stress of the roller. If the early addition of rubber, under the superposition of lateral pressure, the roll is very vulnerable to damage. For the sake of safety, the empty car should be preheated, which needs to be emphasized to the operator.
Before feeding, the rubber should also be checked. If it is mixed with hard metal debris, it will be put into the rubber mixing machine with the glue, which will cause sudden increase in lateral pressure and easy to cause equipment damage.
II. Correct operation
First of all, the roller spacing should be adjusted to keep the balance of the roller spacing. If the two ends of the roller distance adjustment size is different, resulting in roller bias load, easy to damage the equipment, which is strictly prohibited. Feeding habits are added from the power of the incoming end, in fact, this is unreasonable. From the bending moment diagram and the torque diagram, the feeding should be at the gear end of the speed ratio. Since the synthetic bending moment and torque of the transmission end are larger than the speed ratio gear end, the hard bulk rubber is first added to the transmission end, which is of course more likely to damage the equipment. Of course, do not first add large chunks of hard rubber in the middle section of the roller, here the synthesis moment is larger, up to 2820 tons of centimeters. The feeding quantity should be gradually increased, the weight of the feeding block should not exceed the provisions in the equipment instruction manual, and the feeding order should be added from small to large. The sudden addition of large blocks of rubber to the roller spacing will cause overload and rush out, not only easy to damage the safety gasket, but also, once the safety gasket fails, it will endanger the roller.
When operating, we should first cut (cut) the knife, and then take the glue in the upper hand. The film is not cut (cut), and it is not allowed to pull hard. It is strictly forbidden to use one hand to feed on the roller, and the other hand to receive the material under the roller. If the rubber material beats and is not easy to roll, it is not allowed to press the rubber material by hand. Push material must be half fist, do not exceed the roller top horizontal line. When measuring roller temperature, the back of the hand must be opposite to the rotation direction of the roller. The cutter must be placed in a safe place. The cutter must be fed into the lower part of the roller when cutting glue. The cutter is not allowed to face the direction of the body.
When playing triangle bag, forbid to carry knife operation, when playing roll, film weight is not allowed to exceed 25 kg. In the process of roller operation, the hot roller suddenly cools, that is, when the roller temperature is found to be too high, the cooling water is suddenly introduced, which will cause damage to the roller under the combined action of lateral pressure and temperature differential stress. Therefore, cooling should be carried out gradually, the best empty car cooling. In the operation of the roller, it is necessary to stop when it is found that there are sundry objects or damper plates in the rubber material or the roller.
In addition to the above, it is also noted that it is forbidden to rely on, stand or sit on the rotating part of the equipment and the material tray; Do not transfer objects above the running roller; When pulling and pushing vehicles, we should pay attention to the surrounding situation to prevent collision and collision, and prevent overturning injuries when loading.