What are the main similarities and differences between the open mill and the internal mixer?

The open mill is a double-roll machine, which uses two rolls with different relative movements at different speeds to generate shear force for mastication. The operation is to continuously carry out the operation of playing triangle bag.

2022-12-14

Influencing factors of internal mixer

That is, the mixing capacity, insufficient capacity will reduce the shearing effect and kneading effect on the rubber material, and even the phenomenon of rubber material slipping and rotor idling, resulting in poor mixing effect. On the contrary, the capacity is too large, the rubber material is difficult to turn over, so that the upper top bolt is not properly positioned, so that a part of the rubber material is retained at the neck of the feeding mouth, so that the rubber material is not evenly mixed, the mixing time is long, and the equipment is easily overloaded and the energy consumption is large. Therefore, the mixing capacity should be appropriate, usually 60% to 70% of the total effective volume of the closed chamber. The mixing capacity of the internal mixer can be calculated by the following empirical formula: Q-loading capacity, Kg; K-filling factor, usually 0.6~07; V -- Total effective volume of closed chamber, L; ρ -- Density of compound, g/cm3. The selection and determination of filling coefficient K should be determined according to the type of raw rubber and the characteristics of the formula, the characteristics of the equipment and the degree of wear, and the pressure of the upper top bolt. NR and formula with high glue content, k should be appropriately increased; For synthetic glue and formula with low glue content, k should be appropriately reduced; For old equipment with large wear degree, k should be increased; New equipment should be smaller; K of meshing rotor internal mixer should be smaller than that of shear rotor internal mixer; When the pressure on the top bolt increases, K should also increase accordingly. In addition, the K of the reverse mixing method must be as large as possible. When mixing in the mixer, the rubber must be subjected to a certain pressure from the top plug. It is generally believed that the upper top bolt pressure is 0.6-0.8MPa. When the rotor speed is constant, the effect of further increasing the pressure is not great. When the mixing capacity is insufficient, the upper top plug pressure cannot be fully exerted. Increasing the pressure of the upper top plug can reduce the non-filling space in the closed chamber and increase the filling degree by about 10%. With the increase of capacity and speed, the pressure of the upper top plug must be increased.

2022-12-14

Matters needing attention of mixer

1. purpose Standardized equipment operation and equipment maintenance, the purpose is to ensure the normal operation of equipment and extend life, reduce maintenance costs and improve production efficiency. 2. scope of application Applicable to rubber mixer equipment operation guidance 3. Special Responsibilities Special equipment operators and maintenance personnel designated by the user shall not violate the rules and operate the equipment skillfully, and supervise the duties of irrelevant personnel not to approach or mess with the equipment. 4. Operation Rules 1. Turn on the power supply in turn. If heating is required, please set the temperature and observe whether the heating is normal. If water is cooled, please open the inlet and outlet valves for normal water supply. 2. Clean up the mixing chamber. Do not use hard objects such as iron wire to remain. Check the oil level and lubrication status of gear oil, engine oil and butter. Pay special attention to the oil level of the triplet oil cup not less than half. Regularly observe the change of the oil level of the triplet. No oil consumption or too fast oil consumption is abnormal (adjust the knob of the triplet). Replace the gear oil of the new machine at least half a year. Add lubricating oil at the movable parts at least once a week, do not exceed half of the oil mirror when refueling, otherwise oil leakage will occur.

2022-12-14

The flip-type internal mixer is a machine used for the plastication and mixing of rubber.

Closed type mixing machine referred to as internal mixer, mainly used for rubber plastic and mixing. An internal mixer is a machine that has a pair of rotors with a specific shape and relative rotation, and intermittently plasticates and mixes polymer materials in a closed state with adjustable temperature and pressure.

2022-12-14

What kind of inspection should be done after the mixer is used for a period of time

What kind of inspection should be done after the mixer is used for a period of time 1: including the monthly inspection requirements of the mixer 2: check the mixer cooling system and temperature control system for fouling. 3: check the internal mixer gear tooth wear. 4: Check whether the radial clearance and axial movement of each bearing of the mixer are within the specified range. 5: Check whether the gaps between the protruding edge of the mixer rotor and the front wall of the mixing chamber, between the end face of the rotor and the side wall of the mixing chamber, between the pressure weight and the charging port, and between the two zhangzi protruding edges are within the allowable range. 6: check the mixer noise.

2022-12-14