What are the uses of plastic extruder series gearbox?

Gear reduction box maintenance and repair of plastic extruder:

1) Maintenance of gear reducer.

The gear reducer part should be well ventilated, and the working environment temperature should be in the range of 5-35.

Always check the amount of lubricating oil in the gear in the box to ensure that the transmission parts in the box are well lubricated.

Note that check the bearing parts of the box frequently, and the temperature change should not exceed 45 during operation.

After 500h of work, the newly put into use gear reducer should clean the oil in the box and replace the lubricating oil.

The gear reducer should be regularly maintained and inspected once a year, and the work content is as follows.

a.Disassemble the gear reducer cover, check the wear and meshing of the working surface of each transmission reduction gear, if there are burrs or shallow pits on the meshing surface, you can use oil stones to grind smooth; Gears with more severe wear should be mapped and prepared for the manufacture of accessories. for replacement at the next maintenance.

b.Check the wear of each bearing. Clean the bearing first, and check whether there are cracks in the inner and outer jackets; Observe the noise level of dry operation and the size of the radial gap, if you don't find any problems. You can add some grease and continue to use.

c.Check whether the lubricating oil in the box is cleaned, if the oil is mixed with impurities or metal powder, the lubricating oil should be filtered and impurities, and then the amount of lubricating oil should be replenished.

d.After cleaning and inspecting the parts in the box, install the box cover; After adding enough grease to each bearing part, replace the oil seal with a new one, and tighten the bearing cover.

e.Clean the outside of the gearbox to keep the equipment clean.

2) The principle of replacement of parts in the gearbox.

If there is a deep wear pit on the involute meshing tooth surface of the gear, the noise is large and irregular when the working rotation is large, and there is often impact vibration, this kind of gear should be replaced.

cracks in the inner or outer sleeve of the ball bearing; Damage to the ball frame; The radial clearance of the inner and outer coats is large; When the jacket is rotated, the bearing rotates with high noise, etc. After the rolling bearing has been cleaned, if one of the above damage is found, the rolling bearing should be replaced.

3) Precautions for replacement and installation of gears and bearings.

Gears and bearings should be cleaned before installation, trimmed and burrs removed.

Detect and replace the gear hole and assemble the shaft and the size of the key and keyway, which should meet the matching tolerance requirements specified in the drawing; The replacement rolling bearing should be of the same designation as the original bearing.

The gear hole is matched with the shaft, and H7 K6 or H7 R6 should be used.

The rolling bearing jacket and the box are matched with K7 N6, and the bore and shaft are matched with H7 M6 or H7 K6.

The extruder and injection molding machine are plastic processing machinery The extruder is to extrude the molten plastic through the extrusion port of a fixed shape under the action of the screw, and cut it after being water-cooled and shaped under the action of the traction judge machine It is mainly used for the continuous production of a large number of products with the same cross-section, such as tubes, rods, profiles, etc., and can also be used for plastic modification and granulation The injection molding machine is to inject the molten plastic into the mold, and after cooling, it is a product It is very widely used, and the places where it is used are different according to the different plastic macro-chong wax

The pressure and output of material extrusion are more stable, and the material is more tightly combined. Zhejiang Jinneng Machinery specializes in the production of extruder screw barrels.

Prevent the rear end of the screw from coming out to the gearbox

It is roughly divided into several functions: melting, mixing, output, and molding.

Plastic extruders have been derived from the original single screw into twin-screw, multi-screw, and even screw-less models.

Plastic extruder bearings looking for Shandong 19 bearings.

Plastic extruders can be divided into single-screw extruders, twin-screw extruders and multi-screw extruders according to the number of screws. At present, the single-screw extruder is the most widely used, which is suitable for the extrusion processing of general materials. The twin-screw extruder has less heat generated by friction, the shear of the material is relatively uniform, the conveying capacity of the screw is larger, the extrusion volume is relatively stable, the material stays in the barrel for a long time, and the mixing is uniform.

Single-screw extruder occupies an important position as a plasticizing granulation machine or a molding processing machine, and in recent years, the single-screw extruder has developed greatly.

The twin-screw extruder has good feeding characteristics, is suitable for powder processing, and has better mixing, venting, reaction and self-cleaning functions than the single screw extruder, and is characterized by its superiority when processing plastics and blends with poor thermal stability. On the basis of the twin-screw extruder, in order to make it easier to process blends with poor thermal stability, multi-screw extruders, such as Guanghua plastic extruder, have been developed.

1. According to the number of screws, it is divided into single-screw extruder, twin-screw extruder and multi-screw extruder;

2. According to whether there is a screw in the extruder, it is divided into screw extruder and plunger extruder;

3. According to the running speed of the screw

Ordinary extruder: the speed is less than 100r min;

High-speed extruder: 100 300r min;

Ultra-high-speed extruder: 300 l500r min.

4. According to the assembly structure of the extruder, there are integral extruders and separate extruders;

5. According to the spatial position of the screw in the extruder, it can be divided into horizontal extruder and vertical extruder;

6. According to whether the extruder is exhausted during the processing process, it can be divided into exhaust extruder and non-exhaust extruder.

Molding principle: The extrusion method of plastic extruder generally refers to the melting of plastic at a high temperature of about 200 degrees, and the molten plastic is formed into the desired shape when passing through the mold. Extrusion is a technically demanding molding method that requires a deep understanding of the characteristics of plastics and extensive experience in mold design.

Extrusion molding is a method of continuously forming materials through a die in a flowing state through heating and pressure in an extruder, also known as "extrusion". Compared with other molding methods, it has the advantages of high efficiency and low unit cost.

Extrusion is mainly used for the molding of thermoplastics, but it can also be used for some thermosets. Extruded products are continuous profiles, such as tubes, rods, wires, plates, films, wire and cable coatings, etc. In addition, it can also be used for mixing, plasticizing and granulating, coloring, blending, etc.

The extruded product can be called a "profile", which is also called a "profile" because the cross-sectional shape is mostly irregular.

Plastic extruder features:

1. Modularity and specialization.

The modular production of plastic extruders can adapt to the special requirements of different users, shorten the research and development cycle of new products, and strive for a larger market share.

The specialized production can arrange the fixed-point production and even global procurement of the various system module components of the extrusion molding equipment, which is very beneficial to ensure the quality of the whole period, reduce costs and accelerate capital turnover.

2. Efficient and multi-functional.

The high efficiency of plastic extruders is mainly reflected in high output, low energy consumption and low manufacturing costs.

Aspect. In terms of function, the screw plastic extruder has not only been used for the extrusion and mixing of polymer materials, but also has been broadened to food, feed, electrodes, explosives, building materials, packaging, pulp, ceramics and other fields.

3. Large-scale and precise.

Achieving a larger size of plastic extruders can reduce production costs.

This has more obvious advantages in large-scale twin-screw plastic granulation units, film blowing units, pipe extrusion units, etc. The major technical equipment required for national key construction services, and the large-scale extrusion granulation unit, one of the three key equipment supporting large-scale ethylene projects, has long relied on imports, so it is necessary to speed up the localization process to meet the needs of the petrochemical industry.

Development needs. 4. Intelligence and networking.

Developed country. The plastic extruder has generally adopted modern electronic and computer control technology, and the process parameters of the entire extrusion process, such as melt pressure and temperature, body temperature of each section, main screw and feeding screw speed, feeding volume, the ratio of various raw materials, the current and voltage of the motor and other parameters are detected, and microcomputer closed-loop control is adopted. This is extremely beneficial to ensure the stability of process conditions and improve the accuracy of products.

The plastic extruder (host) can be matched with various plastic molding auxiliary machines such as pipes, films, materials, monofilaments, flat wires, packing belts, extruded nets, plates (sheets), profiles, granulation, cable coating, etc., to form a variety of plastic extrusion molding production lines and produce various plastic products. Therefore, plastic extrusion molding machinery is one of the widely used machines in the plastic processing industry, both now and in the future.

Generally, it is used for the production of special materials, masterbatches, or functional masterbatches. Plastic factories, masterbatch factories, plastic factories, polymer material modification, and so on will be used, and laboratories will use small ones, as testing machines.

As the name suggests, it is used on plastics, used for plastic pipes, profiles, granulation, etc.

The extruder is used to do plastic modification and the like, you can try to do modification!