Application and its characteristics. Ultrasonic cleaning relies on a combination of cavitation, circulation flushing, and agitation by high-speed microjets to cause metal compounds to fall off the surface of the wire. Ultrasonic cleaning hot-dip galvanizing continuous line can produce 010~50 galvanized steel wire, and the Dv value is 32mm.m/mn. The two production lines have achieved the design effect.
1,19 large-capacity re-accounting AcadcJo legalElectronicPublish control the whole process of production and production of household temperature and lead temperature stability / controllable rikS steel wire production of waste gas, waste acid, wastewater and dust pollution caused by the environment. Under the general trend of vigorously promoting environmental protection, creating garden-style factories and creating a humanized working environment, how to reduce or control the generation and emission of waste gas, waste acid, waste water and dust is an important issue facing all enterprises.
Hangzhou Shubote New Material Technology Co., Ltd. designed and built 28 large-disc heavy-duty, open-heating, ultrasonic cleaning, phosphating continuous operation lines and 30 large-scale heavy-duty, ultrasonic cleaning and hot-dip galvanizing continuous lines. . More than a year of operation indicates that the line meets design requirements.
1 Ultrasonic cleaning phosphating production line Ultrasonic cleaning Phosphating two production lines complete the process: wire-mechanical except pound ※ large plate heavy-duty wheel take-up line; large-disc heavy-duty wheel line open flame heat-heated lead quenching ultrasonic cleaning ※ hot water wash phosphating ※ Hot water wash ※ Drying ※ Large plate heavy work wheel rounds.
Features of the production line: large plate weight, open flame heating and ultrasonic cleaning.
The mechanically rust-removed wire or the thick-drawn steel wire is wound on the 01150 type wheel, and the single-wheel winding reaches the 2~26l upper and lower line mechanized operation. The labor intensity of the operator is greatly reduced, and the entire production line can only meet 3 people. Production requirements. To achieve continuous and stable production of steel wire heat treatment, and to create favorable conditions for improving the operating rate of wire drawing machine, two operators can open three LZ9/700 or LZ/600 wire drawing machines at the same time, and the labor productivity is greatly improved.
1.2 Open flame heating 3 low-pressure fuel nozzles are opposite to the running direction of the steel wire, arranged in 3 stages, the lateral temperature distribution in the furnace is evenly distributed, the steel wire is directly heated by the flame and the furnace radiant, and the thermal efficiency of the heating furnace reaches more than 35%. When the pressure is adjusted to the micro-positive pressure and the burner is adjusted reasonably to make the atmosphere in the furnace reach the micro-reducing atmosphere, the oxidation rate of the steel wire is less than Q5%. Since the oil is fully burned in the furnace, the flue gas can be used to preheat the combustion-supporting air and oil. The discharged flue gas has no dust and no pollution.
Using computer technology to measure the temperature of the furnace 3, the flue gas temperature of the flue, the fuel injection volume of the burner, the temperature of the lead liquid, etc., and Zhang Jifeng was born in 1957. Senior engineer, Hangzhou Shubote New Materials Technology will produce The deputy general manager and chief engineer of the company caused by environmental pollution.
The art parameters are input into the computer. The working state of the heat treatment furnace and the lead pan in the production process is controlled by the computer, the work is stable, and the performance of the steel wire rod after heat treatment is uniform. The tensile strength fluctuation of the same batch of steel wire with the same diameter after heat treatment is not more than 25 MPa1.3. Ultrasonic cleaning 1 The principle of ultrasonic cleaning The frequency of ultrasonic cleaning is 20 ~ 80. The main mechanism of ultrasonic cleaning is cavitation. Generally, water, weak acid or weak alkali is used as the cleaning medium. The temperature is 50~65°C. The bubble vibrates under the action of a strong sound field. When the sound pressure reaches a certain value, the bubble rapidly becomes large, and then suddenly ruptures. The shock wave generated when the bubble breaks can form a pressure of thousands of atmospheres, and the iron oxide and the dirt layer are instantly hit. Broken and peeled off. During the oscillation process, cavitation bubbles occur with a series of second-order phenomena, such as radiation torsion, which causes the liquid to circulate. The surface of the vibrating bubble is under a high velocity gradient and viscous stress, causing the dirt on the surface of the wire to break and fall off. The high-speed microjet produced by cavitation can remove or weaken the boundary fouling layer, increase the stirring effect, accelerate the dissolution of soluble dirt, and strengthen the cleaning effect of the cleaning agent.
Ultrasonic cleaning is mainly based on cavitation, liquid circulation flushing, and agitation of liquid under the action of high-speed microjet. The metal compounds such as FeQ, Fe4FeQNiCrM and organic pollutants in the surface oxide layer of the steel wire are in a few seconds. The inner part falls off from the surface of the steel wire Since the metal oxide or metal compound in the oxide layer on the surface of the steel wire has strong magnetic adhesion to the surface of the steel wire, in order to achieve a desired clean state of the surface of the steel wire in a few seconds, a low-concentration weak acid solution or an alkaline solution is used. The medium is cleaned and the magnetic metal oxide and the metal compound are dissolved by a chemical reaction. The ultrasonic cleaning and the chemical cleaning are organically combined to form an ultrasonic chemical cleaning, which enhances the cleaning effect.
1.32 Advantages of Ultrasonic Chemical Cleaning In the traditional chemical pickling, sulfuric acid or hydrochloric acid is used as the pickling solution. The surface cleaning of the steel wire is carried out by the redox reaction between the acid solution and the metal oxide. The concentration of the acid solution is adjusted in the production practice. , temperature, pickling time to ensure the cleaning quality of the wire. The steel wire is prone to hydrogen embrittlement and corrosion during pickling, and at the same time causes a large amount of acid mist to escape, pollute the working environment and corrode the equipment in the workshop.
Ultrasonic cleaning is a comprehensive cleaning based on physical cleaning, supplemented by weak acid chemical reaction to dissolve magnetic metal oxides. It is quite different from the traditional chemical cleaning mechanism that relies mainly on strong acid chemistry to dissolve metal oxides. The ultrasonic cleaning effect is only related to the sound pressure and sound intensity of the ultrasonic wave. The cleaning time is short. The concentration of the weak acid solution used as the auxiliary cleaning agent is low. No acid mist is generated during the cleaning of the steel wire. Ultrasonic cleaning equipment for cleaning equipment is mainly composed of ultrasonic generator, transducer and cleaning tank. The ultrasonic generator is a working part that generates an electromagnetic oscillation signal and provides energy, and gives the transducer a certain frequency of electromagnetic oscillation energy. If this frequency is the resonant frequency of the transducer itself, the most effective ultrasonic vibration is generated; the transducer converts the electromagnetic vibration signal generated by the ultrasonic generator into ultrasonic vibration, thereby pushing the vibration of the medium connected to the mechanical vibration system. The sound wave is radiated into the medium; the ultrasonic cleaning tank is divided into a liquid storage tank and a working tank, the liquid storage tank stores the cleaning liquid in the lower part of the working tank, and the ultrasonic transducer (sealing) is installed in the bottom of the working tank in the production, and the liquid pump is used The cleaning liquid is pumped into the working tank, and the steel wire passes through the surface to achieve surface cleaning.
1...4 Recovery treatment of ultrasonic cleaning solution When the content of Fe+2 and Fe+3 ions in the ultrasonic cleaning solution reaches a certain value, the cleaning liquid is discharged into the liquid storage tank for regeneration and recovery.
The regeneration equipment and process of the cleaning liquid are relatively simple. First, the solution to be regenerated is pumped into the reaction tank, and several additives required for the reaction are added as required. After the reaction is completed, the solution is placed in the sedimentation tank, and the precipitate is cleaned after being cleaned. The solution is discharged into the liquid storage tank, and the slag-containing solution is discharged into the filter press or the centrifugal slag machine to separate the slag liquid, and the liquid is returned to the liquid storage tank, and the slag is sent to the chemical processing plant for treatment. With this regeneration treatment method, the recovery rate of the ultrasonic cleaning solution is 85% or more. Compared with the traditional method of treating waste acid in sulfuric acid pickling or hydrochloric acid pickling, the waste ultrasonic cleaning liquid is simple in recovery process, and the simple cleaning liquid has high recovery rate and low cost.
2 Ultrasonic cleaning hot-dip galvanizing line Ultrasonic cleaning Hot-dip galvanizing continuous line can produce 01. 0~50 galvanized steel wire, DV straight 32mm.m/mn I-shaped wheel retractable wire quality up to 1t Process: I-shaped wheel release line ※ Ultrasonic cleaning hot water wash solvent drying vertical galvanizing ※ I-shaped wheel take-up line.
Considering the interchangeability of the equipment and the ease of maintenance and maintenance, the mechanism and equipment for ultrasonic cleaning is the same as that of the phosphating continuous line. A set of regeneration equipment can be used to treat the waste liquid generated by the two lines.
3 Conclusion The adoption of new technologies and new technologies has made the production workshop of Hangzhou Shubote New Material Technology Co., Ltd. no dust, no waste gas pollution, no waste acid and wastewater pollution. It fully embodies the human-oriented humanized management concept, improves the working environment of employees and reduces labor intensity.
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