First, if it is new equipment, we should consider whether it has been run-in with wet materials or oil after buying it. This is a problem that many people easily ignore. If this link is ignored, it is likely to cause the machine to be stuffy and blocked as soon as it is turned on, and of course it will not discharge. Therefore, it is necessary to take some sawdust from the bought sawdust granulator and add about 65,438+00% industrial oil, such as ordinary engine oil. Crushing the small pieces in the material, fully mixing them, putting them into a chip granulator, starting the machine to press the particles, then putting the pressed particles back into the chip granulator, repeating for 5-6 times, and then putting them into ordinary chips for normal granulation.
Second, if it is not new equipment, the production needs to be arranged from the following points: 1, granularity. 2. Temperature and pressure of equipment heating. 3 sawdust raw materials. 4. Compression ratio of the mold. 5 the gap between the pressure roller and the ring die, etc. Below I will explain in detail the reasons why several common particles are not formed, hoping to help our customers.
1, granularity. The research shows that the smaller the size of biomass, the higher the gasification efficiency, because when the size is smaller, the gas generated inside biomass is easier to spread to the surface.
2. Temperature and pressure of equipment heating. Too high or too low temperature and pressure will lead to molding failure, and also have an important impact on the density and effect after molding. If the temperature is too low, the input heat will be reduced, which is not enough for the material to be molded, and it will also increase the power consumption of the molding machine. If the temperature is too high, the surface of the molding fuel will be seriously decomposed, cracks will appear, the strength of the molding fuel will be reduced, and even it will not be molded. Too high or too low pressure will also directly affect the finished product to be molded.
3. Raw materials:
A generally speaking, soft wood chips, such as pine, are easy to granulate. If the raw material is fine in texture or flour-like fine powder (the specification of sawdust is preferably 1-2mm), then it is necessary to mix wood shavings, which can basically be molded.
B. Moisture control: The moisture content of sawdust raw materials should be controlled at about 13% (currently, the moisture content of finished products in the market is generally 8%). Because of the inherent hardness of raw materials and other reasons, the specific value should be obtained according to the actual production situation (the recommended moisture content range is between 10-20%). Our sawdust granulators, such as pine, Chinese fir and eucalyptus, need moisture content.
C. Principle of raw materials: Different raw materials, such as sawdust, straw and paper scraps, have different properties, different fiber structures and different molding difficulties. For materials that are difficult to press, such as palm, another point is that if they are mixed materials, the mixing ratio of various components will also affect the molding speed.
4. The compression ratio of the die does not match the characteristics of the raw materials: some enterprises think that the compression ratio is the ratio of the length of the die hole to the diameter of the die hole, while others call it the length-diameter ratio. Other companies believe that the compression ratio is the ratio of the square of the horn hole diameter to the square of the touch hole diameter. No matter which method is used to calculate the compression ratio, the pore size of the material will become larger, the length of the die hole will become shorter and the particle quality will decrease due to the extrusion friction between the material and the die and the press wheel in the production process. Therefore, the abrasive compression ratio provided by manufacturers to users is only customized according to commonly used materials. Therefore, customers want to find a suitable compression ratio according to their own raw materials, which requires customers to pay close attention to in production practice. Only in this way can we better grasp the quality of particles and improve the working efficiency of equipment.
5. Adjustment of the gap between the pressure roller and the grinding tool: Generally, the best gap between the pressure roller and the grinding tool is 0. 1 ~ 0.3 mm, and the gap is too large and the pressure is not enough to be extruded. If the gap is too small, the density and smoothness of the accumulated particles may be better, but it will increase the friction of the molding wheel, reduce the life of the grinding tool and affect the output of the granulator.
(1). Adjustment of gap of flat die granulator: There are two kinds of flat die granulators on the market at present. One is that the pressure wheel is fixed and the grinding tool rotates. There are two screws on both sides of the silo of this flat die granulator, and the gap between the pressure wheel and the grinding disc is adjusted by the tightness of the screws. The smaller the gap, the higher the relative hardness of the particles. This flat die granulator is a granulator for making feed, and its service life is affected by sawdust. The other is that the grinding tool is fixed and the pressure wheel rotates. The production practice of this flat die granulator for pressing sawdust particles shows that it is an economical and practical granulator, and its gap adjustment is completed by the pressure bar elastically fixed on the main shaft, which is convenient to operate.
(2) Adjustment of the gap of vertical ring mold granulator: The vertical ring mold granulator is one of our company's flagship products. It is the most durable biomass fuel granulating equipment in China at present. The adjustment of the press roller and grinding tool is completed by adjusting the screws on the press roller fixing device. When installing a new mold, firstly, loosen the adjusting bolt of the pressure roller and adjust the pressure roller to the state that the outer circular surface of the pressure roller abuts against the inner circular surface of the annular mold; Secondly, the eccentric shafts of the pressure rollers are adjusted in turn to make the gap between each pressure roller and the ring die appropriate, and the gap is gradually adjusted. Third, tighten the adjusting bolt.
In use, protecting the mold is at the expense of the roller skin, because the price of the mold is dozens or even hundreds of times that of the roller skin, so when choosing a reasonable gap, the hardness of the roller skin should not be too high, that is to say, the wear resistance of the roller skin should not be higher than that of the ring mold. (Of course, this is provided by the manufacturer for you, depending on the manufacturer's conscience. )
So how to judge the gap between the ring die and the press roller is between 0. 1-0.3 (of course, this is only a data, which is convenient for description)? According to my years of practical experience in the industry, two people are needed to cooperate in the operation. When the motor clicks, it is better to hear the contact between the mold and the press bar. (Non-professionals should not practice to avoid equipment failure! )
Third, we should pay attention to the usual equipment maintenance after adjustment. In the process of equipment production, necessary cleaning shall be carried out for the materials used to avoid the mixing of hard particles such as big sand, sand, iron, bolts and iron filings. Because these inclusions accelerate the wear of the ring die, and a large number of hard inclusions will cause the ring die to be stressed many times and make the ring die tired. When the stress exceeds the strength limit of the ring mould for a certain time, the ring mould will explode.
Jinan Guanbei Machinery Manufacturing Co., Ltd. has been focusing on particle machinery manufacturing for 8 years, changing the market with our technology and creating wealth for customers with my sincerity. This article was written by Sun Jian politician, a mechanical engineer in Jinan Guanbei. Please indicate the source for reprinting. Counterfeiting will be investigated. Company official website: www.guanbeijixie.com.