Constant temperature and humidity machine in shell making workshop and constant temperature and humidity system in shell drying room
It is understood that during the processing of the silica sol investment casting factory, the production environment of the mold making process or shell making process workshop has strict requirements,
Generally, it is required to achieve the state of constant temperature and humidity, separate the paint room from the drying room, and have a good production environment for management and control
The drying room temperature of the surface layer, the second layer and the transition layer is about 25 ℃, and the humidity is 45-60% RH; The sealing layer temperature is about 25 ℃, and the humidity is 25-40% RH
The change of ambient temperature and humidity directly affects the drying rate of shell mold, thus affecting the precision of shell mold
1、 The shell making workshop of a precision casting enterprise in Zhejiang Province plans to build a drying room that can rapidly dry 600 silica sol shells per batch
Working conditions in the drying room area; The area is 50 ㎡, the net ceiling height is 4.3 m, the product weight W: ≤ 40 kg, and the output: ≥ 600 pcs/batch
The construction site is shown in the figure:
2、 Requirements for constant temperature and humidity system of silica sol shell rapid drying chamber:
(1) Product drying temperature requirements: 22 ± 1 ℃ (system setting value during drying)
(2) Product drying humidity requirement: 55 ± 5% RH (system setting value during drying)
(3) Ambient wind speed: 0~3m/s adjustable,
(4) The deviation between the wind speed at any point in the environment and the set wind speed, ≤ 0.5m/s
(5) Environment control temperature regulation range: 18 ℃~30 ℃
(6) Environment control humidity regulation range: 40% RH~70% RH
(7) Ambient temperature uniformity: the deviation between the measured value of temperature at any point in the environment and the set value of system temperature: ≤ 1 ℃
(8) Environmental humidity uniformity: the deviation between the measured value of humidity at any point in the environment and the set value of system humidity: ≤ 5% RH
(9) Requirements for response speed of ambient temperature: no matter in the no-load state or the load state, the ambient temperature needs to reach the temperature setting value within 15 minutes, remain stable and meet the temperature uniformity requirements
(10) Requirements for response speed of environmental humidity: no matter in the no-load state or the load state, the environmental humidity needs to reach the set value within 15 minutes, remain stable and meet the humidity uniformity requirements
(11) The temperature and humidity control system adopts the full closed loop control mode, and the temperature and humidity control sensor shall not be arranged in the supply and return air duct
3、 Solution for constant temperature and humidity of silica sol shell rapid drying chamber:
(1) At present, most of the shell making workshops in domestic precision casting plants use air conditioners+dehumidifiers+fans to complete the comprehensive control of temperature, humidity and wind speed
This method is adopted in the silica sol shell drying room of the shell making workshop; The use of PD45G shell drying room dehumidifier in shell making workshop can effectively reduce the environmental humidity, and control the humidity in the drying room at about 20% RH
At the same time, it can also ensure that the temperature in the shell drying room is about 25-50 ℃; The interaction of the three makes the EPC drying rate increase by about 25%; The drying and single brushing time is only 8-12 hours
(2) In addition, some large-scale shell making workshops of precision casting have adopted high-precision constant temperature and humidity machines to achieve simultaneous control of temperature and humidity
_ The constant temperature and humidity unit in the shell making workshop and HF series air-cooled constant temperature and humidity unit products have the functions of automatic heating, cooling, humidification, dehumidifying air purification, and adding fresh air, which are divided into automatic and manual forms
The adjustment of temperature and humidity can be carried out synchronously to ensure the accurate demand of maintaining the constant temperature and humidity of the indoor environment within the set temperature and humidity range
The unit can meet the needs of temperature and humidity in all corners of large space by installing air supply pipes and return pipes; In addition, new air ducts can be designed for places where fresh air is needed to meet the requirements of indoor fresh air
At present, the high-precision constant temperature and humidity system has been widely promoted in more and more factories or enterprises in the domestic investment casting industry, and has also achieved some results
All the above contents about the constant temperature and humidity machine in the shell making workshop and the constant temperature and humidity system in the shell drying room are provided by Parkoo Electric, for your reference only
