1. Technical Introduction The pollution-free vegetables refer to the commodity vegetables whose pesticide residues do not exceed the national standards, whose nitrate content does not exceed the standard, "three wastes" and other harmful substances do not exceed the standard, pathogenic microorganisms and other harmful microorganisms do not exceed the standard, to avoid environmental pollution. The adoption of comprehensive prevention and control technologies to control pests and diseases is the most critical link in the production of pollution-free vegetables. The principle of comprehensive prevention and control of vegetable pests and diseases is: to cultivate and select pest-resistant varieties, or adopt a series of measures such as adjusting the growing period of vegetables, etc., to increase the resistance of vegetables to diseases and pests; prevent new pests from intruding, and take measures against existing pests and diseases. To reduce the overwintering technology, cut off the means of transmission, prevent disease infestation, or eliminate pests before serious damage; through cultivation and management, to improve the vegetable field ecosystem, and create an environment conducive to the growth and development of vegetables unfavorable to the development of pests and diseases condition. 2. Operating procedures (1) Agricultural control Through adoption of disease-resistant varieties, a set of agricultural measures such as fitness cultivation and reasonable rotation is adopted to improve the resistance of vegetables and reduce the damage of pests and diseases. Including: 1 Anti-disease and insect species should be selected according to local conditions. 2 seed treatment and seed bed high temperature disinfection. 3 timely sowing, according to the local weather forecast and the characteristics of vegetable varieties, select the appropriate sowing date. 4Use medium shed or greenhouse nursery, nutrition seedling nursery, use high temperature to promote root and early hardening seedlings to prevent seedlings grow, to reduce seedling disease, seedlings robust, and enhance resistance to disease. 5 Deeply plowing the soil preparation, applying sufficient basal fertilization, and reasonable rotation and intercropping. Deep plowing can promote the decay of diseased plants and fallen leaves under the soil and turn the underground germs and pests to the surface, which is not conducive to wintering and reducing the source of disease and insects. 6 Improve cultivation methods and strengthen field management. Control the ecological conditions of greenhouses and greenhouses to prevent the occurrence of diseases. 7 Graft prevention and control of soil-borne diseases. (2) Physical prevention and control 1 The use of black light can trap and kill a variety of pests; the use of sun drying insecticide sterilization; use shade nets to suppress disease. 2 Use yellow boards, blue boards or white boards to trap and kill pests; use silver gray film or silver-grey nets, hanging strips to repel pests. 3 Shaizhong, soaking seeds and other high temperature treatment of seeds; high-temperature killing pests in the soil; high temperature stuffy shed to inhibit the disease. (3) Biological control First, the use of predatory natural enemies such as ladybugs, grasshoppers, food flies, falcons, etc.; utilization of parasitic natural enemies such as Trichogramma, Lygus sinensis, etc.; use of predatory spiders and fleas. Next, the protozoa are killed by protozoa such as Bacillus thuringiensis (Bt), Beauveria bassiana, Metarhizium anisopliae, nuclear polyhedrosis virus (NPV), avermectin antibiotics, microsporidia, and the like. Thirdly, various pests are controlled by using plant-origin pesticides such as veratrine alcohol solution, Sophora flavescens, bitter buckwheat, nicotine and dioscin. Fourth, in the field of disease prevention and control, the CMV satellite vaccine S52 and the tobacco mosaic virus attenuated vaccine N14 can be used to prevent viral diseases, and jinggangmycin, polyoxin, Qingfengmycin, and Nongkang 120 can also be used. , Bo-10 (wuyimycin), agricultural streptomycin and neomycin and other agricultural antibiotics to prevent diseases. (4) Reasonable use of chemical pesticides Pollution-free vegetables are not chemical pesticides. Chemical pesticides are an effective means of preventing and controlling vegetable pests and diseases. In particular, disease prevention and pest outbreaks are effective prevention and control measures. The key is how to use them scientifically and reasonably. It is necessary to prevent and control diseases and insect pests, but also to reduce pollution, so that the amount of pesticide residues in listed vegetables is controlled within the allowable range. To achieve reasonable use of chemical pesticides, it is necessary to pay attention to the following points: First, be familiar with the types of pests and diseases, understand the nature of pesticides, and achieve the right medicine; Second, strictly enforce national regulations, prohibit the use of highly toxic and high-residual pesticides; Third, the use of high efficiency and low ( Medium) Poison, low residue pesticides.
Daily maintenance of excavator hydraulic cylinders
Big arm cylinder kit, middle arm cylinder kit, small arm cylinder kit Safe Seal Technology Co., Ltd. , https://www.jolseals.com
The hydraulic cylinder of an excavator is one of the important hydraulic components responsible for driving and controlling mechanical movements. In order to ensure the normal use of hydraulic cylinders and extend their service life, daily maintenance is necessary.
1. Regularly clean the hydraulic cylinder: During use, the hydraulic cylinder will be attacked by various pollutants, such as dust, sediment, oil stains, etc. These pollutants can affect the working efficiency and lifespan of the hydraulic cylinder. Therefore, it is necessary to regularly clean the hydraulic cylinder.
2. Regular inspection of seals: The seals of hydraulic cylinders are key components to ensure their normal operation. If the seals are damaged or worn, it can lead to oil leakage or unstable operation of the hydraulic cylinder. Therefore, it is necessary to regularly inspect the sealing components of the hydraulic cylinder and replace them in a timely manner if there is any damage or wear.
3. Regular inspection of hydraulic oil: The operation of hydraulic cylinders requires the support of hydraulic oil, so the quality of hydraulic oil has an important impact on the working effect of hydraulic cylinders. Regularly check the quality of hydraulic oil, and replace it promptly if there is contamination or deterioration.
4. Regularly check the hydraulic pipeline: The hydraulic pipeline is the blood vessel of the hydraulic cylinder. If there is oil leakage or damage to the pipeline, it can cause the hydraulic cylinder to not work properly. Therefore, it is necessary to regularly inspect the hydraulic pipelines and promptly repair or replace them if there is any oil leakage or damage.
5. Regularly lubricate the hydraulic cylinder: The piston rod and piston ring of the hydraulic cylinder need to be lubricated to reduce wear and friction. Therefore, it is necessary to regularly apply lubricating oil to ensure the normal operation of the hydraulic cylinder.
In short, the daily maintenance of excavator hydraulic cylinders is very important, which can extend their service life and improve work efficiency. Regular cleaning of hydraulic cylinders, inspection of seals, hydraulic oil, hydraulic pipelines, and lubrication of hydraulic cylinders are required.