The rubber mixing mill is a kind of rubber mixing machine with exposed rollers used by rubber factories to prepare plasticized rubber, mixed rubber, or perform hot mixing and molding. The following is its detailed introduction:

1. Working principle:
- The rubber mixing mill mainly squeezes and shears the rubber through two relatively rotating rollers. In this process, the original macromolecular chains of the rubber are broken, which reduces the original elasticity of the rubber and improves its plasticity, which is beneficial to the subsequent processing steps.
2. Main components:
- Mixing part: mainly includes rotor (there is a rotor in the internal mixer, and the roller plays a similar role in the mixing mill), internal mixing chamber (the working space of the mixing mill is similar to the function of the internal mixing chamber, but it is relatively open), sealing device, etc. In the mixing mill, the roller is the core component, which directly undertakes and completes the kneading of materials.
- Feeding part: It consists of a feeding chamber, a bucket-shaped feeding port and a flap door (feeding door), which is used for feeding and instant storage.
- Pressing part: usually there is a pressing device to give a certain pressure to the rubber material, accelerate the rubber mixing process and improve the rubber mixing effect.
- Discharging device part: used to discharge the rubber material after the rubber mixing is completed.
- Transmission device part: composed of motor, elastic coupling, reducer and gear coupling, etc., to transmit power, so that the roller overcomes the working resistance and rotates, thereby completing the rubber mixing operation.
- Base: including the main machine base and transmission base, for use by the internal mixer, on which the main machine and transmission system components are installed.
- Heating and cooling system: composed of pipes and distributors, etc., can pass cooling water or steam into the cavity of the roller, etc. for circulation to control the temperature of the rubber material.
- Electronic control system: composed of control box, operating machine and various electrical instruments, it is the operation center of the entire machine.
- Lubrication system: composed of oil pump, oil distributor and pipeline, injecting lubricating oil into each rotating part to reduce the friction between moving parts and extend the service life.
3. Main uses:
- Raw rubber processing: plasticize the raw rubber to reduce its elasticity and improve its plasticity, so as to prepare for the subsequent processing of the raw rubber.
- Rubber compound mixing: mix various rubber raw materials, compounding agents and additives together to make them evenly distributed and obtain the required performance and quality. For example, in the production of rubber products, it is necessary to mix a variety of materials such as natural rubber, synthetic rubber, carbon black, vulcanizers, etc.
- Rubber compound sheeting: press the mixed rubber into a specified thickness for subsequent processing or molding, such as making rubber sheets, rubber plates and other products.
- Impurity removal: during the rubber mixing process, impurities in the rubber can be squeezed out to improve the purity of the rubber.
- Recycled rubber processing: used for the crushing, mixing, refining and other operations of recycled rubber, so that waste rubber can regain its utilization value.
4. Advantages:
- Simple structure: Compared with other rubber processing equipment, the structure of the open mill is relatively simple and the manufacturing difficulty is relatively low.
- Easy to operate: The operation method is relatively easy to master. After a certain amount of training, the operator can get started quickly.
- Convenient maintenance: The equipment is relatively easy to disassemble and repair, and it is easy to maintain and maintain.
- Strong applicability: It can be applied to the processing of a variety of rubber materials, and has good adaptability to the production of rubber products with different formulas and process requirements.
- Easy to observe: The open structure allows the operator to directly observe the processing process of the rubber between the rollers, which is convenient for timely adjustment of process parameters.
5. Disadvantages:
- High labor intensity: Workers need to operate manually, which consumes a lot of physical energy, especially in the long production process, which requires high physical fitness of workers.
- Low safety: Due to the exposure of the rollers, operators are prone to work-related accidents during operation, and there are certain safety hazards.
- Dust pollution: During the rubber mixing process, dust is easily generated, which not only pollutes the environment, but also causes the loss of formula materials.
- Unstable quality: The quality of rubber mixing depends to a certain extent on the experience and technical level of the operator, and the quality stability is relatively poor.
6. Technical parameters:
- Roller diameter: It is one of the important parameters to measure the specifications of the mixing mill. The larger the roller diameter, the greater the processing capacity and handling volume of the equipment.
- Roller width: It affects the width and output of the rubber compound processed each time.
- Roller speed ratio: The speed ratio of the front and rear rollers has an important influence on the mixing effect and processing efficiency of the rubber compound. Different rubber materials and process requirements may require different roller speed ratios.
- Roller spacing: The adjustable roller spacing range determines the thickness and hardness range of the rubber compound that can be processed.
- Motor power: The size of the motor power determines the power output of the mixing mill and the rubber compound load that can be handled.