A plate rolling machine is a machine that will roll different kinds of metal sheet into a round or conical shape. It can be also called a [roll bending machine", [plate bending machine" or [rolling machine". Plate Rolling,Plate Rolling Machine,Plate Roller,Plate Bending Machine,Rolling Bending Machine Jiangsu Hoston Machine Tools Co., Ltd. , https://www.hostoncncs.com
Zhang Dezhao said that according to preliminary investigations, there are abundant shallow geothermal energy in 11 cities including Zhengzhou, Kaifeng, Xinxiang, Fuyang, Xuchang, Luohe, Zhoukou, Jiaozuo, Anyang, Luoyang, and Nanyang in Henan Province.
The shallow geothermal energy development in Henan Province originated in the 1990s, but its effectiveness was very limited. Since then, the province’s relevant industry organizations have proposed no plans to respond to the mining plan. However, this situation has been accompanied by the shortage of traditional cold sources, people’s attention to the development of new and renewable energy sources, and the increasingly mature nature of ground source heat pump technology. In particular, private forces are actively promoting this. In Henan Province today, like other provinces in the country, ground-source heat pump technology is rapidly being promoted and has entered a period of rapid development.
According to incomplete statistics, there are ground-source heat pump projects in 18 municipalities in Henan Province. Among them, there are more applications in Zhengzhou, Nanyang, Luoyang, Xinxiang and Anyang; more than 1,000 ground source heat pump projects have been completed, mainly groundwater source heat pump projects, with an application area of ​​more than 22 million square meters.
Henan Province is also one of the markets where heat pump manufacturers are heavily stockpiled. At present, there are well-known companies such as Clement, Carrier, Tsinghua Tongfang, Fulda, Midea, SEAT, and others. Among them, Clement, Tsinghua Tongfang and Carrier ranked among the top three in the market. As of the end of 2010, Clement has a project area of ​​4.2 million square meters; Tsinghua Tongfang 3.32 million square meters; Carrier 3 million square meters. Among them, the Clement groundwater ground source heat pump project accounts for about 70%, and the buried pipe project is about 30%. In 2010, 68 ground source heat pump units were put into use, and the application area was about 800,000 square meters. Among them, there are 55 groundwater ground source heat pump projects, with a construction area of ​​about 500,000 square meters, and 13 underground source heat pump projects with a construction area of ​​about 300,000 square meters. From another point of view, the application of heat pump equipment manufacturers projects have increased to varying degrees from the previous year. In 2010, Clement's application area increased by 1.45 million square meters compared to 2009, with a growth rate of 52.73%; Tsinghua Tongfang increased 1.47 million square meters, with a growth rate of 91.1%.
With the active advocacy and support of government departments, ground-source heat pump technology is gradually improving, and shallow geothermal energy will become the most common source of geothermal energy in Henan Province.
The ground-source heat pump industry in Henan Province has been operating for many years and has seen great development. There has been a trend of strengthening basic work and adjusting the types of ground-source heat pump development. There have also been burgeoning projects on the large-scale projects that are worthy of vigilance.
First, the local land and resources department has intensified its efforts to evaluate and evaluate shallow geothermal energy in the provincial capitals and provinces. In 2008, Henan Province issued investigation and evaluation missions in urban areas of Zhengzhou, Sanmenxia, ​​Luoyang, and Kaifeng, involving 2293 square kilometers of survey and evaluation; in 2010, it issued inspection and evaluation missions in 11 cities including Jiyuan, Zhumadian and Luohe. It covers an area of ​​4090 square kilometers. By the end of 2010, it will complete the survey and evaluation of Sanmenxia and Luoyang, and will complete the survey and evaluation work by the end of last year.
Second, the type of ground source heat pump development tends to be rational in its choice. The development unit is more aware of the existence of groundwater-source heat pump systems, such as difficulties in recharging, easy plugging, and strict review, etc., and no longer “throwing side by side†but thinking calmly. As a result, the proportion of projects selecting ground source heat pump systems is increasing.
Finally, the large-scale underground water source heat pump system project still has signs of “turning into the worldâ€. Many projects with an area of ​​more than 40,000 square meters have been launched or planned for implementation. This phenomenon runs counter to the call for "rationalization". It is difficult to say that it is not a kind of erroneous sprouting - the oversized groundwater ground source heat pump system should not be promoted.
At the same time, shallow geothermal energy development in Henan Province still has the following problems to face:
First, the status quo of development is unclear, blindness is relatively large, and management planning and guidance of relevant departments of the province are lacking. Heat pump companies can easily swarm to large areas.
Second, shallow geothermal energy survey and evaluation work has not received due attention. Most of the existing application projects have not undergone a preliminary geothermal survey of shallow geothermal energy, and have been severely disconnected from hydrogeology, engineering geology, and other specialties. The consequences are unpredictable. The shallow geothermal energy survey and evaluation work in the area should be emphasized, but the delay in the establishment of the survey results in the inability of the survey results to guide the rational application of shallow geothermal energy.
Third, there is a lack of research and monitoring of the effect of the existing project's operation, thermal equilibrium and its impact on geological environmental conditions. The improper selection of ground source heat pump systems in some areas has caused serious consequences. Taking Kaifeng as an example, there are probably more than 100 projects in the region that engage in ground source heat pumps, but a large part of them are "false recharge." The establishment of a restraint mechanism should include early-stage surveys and late-stage supervision. Inconsistent management or lack of management and offside will result in ineffective treatment of serious problems such as “false reinjectionâ€.
Fourth, the development, survey, design, and construction companies have not established entry conditions and the quality of construction varies greatly. Although the development of the ground source heat pump industry in Henan Province has achieved great results, the management of some areas is not good, and the overall contradictions are still quite obvious.
There are different kinds of technology to roll the metal plate:
Four-roller machines have a top roll, the pinching roll, and two side rolls.
The flat metal plate is placed in the machine on either side and "pre-bent" on the same side. The side rolls do the work of bending. The pinching roll holds the plate.
Three-roller machines (variable pitch aka variable geometry) have one pressing top roll and two pressing side rolls.
The three-roll variable pitch works by having all three rolls able to move and tilt. The top roll moves in the vertical plane and the side rolls move on the horizontal plane. When rolling, the top roll presses the metal plate between the two side rolls. The advantage of having the variable three roll is the ability to roll many thicknesses and diameters of cylinders.
For example; The side-rolls are what produce the mechanical advantage. With the side rolls all the way open, one has the maximum mechanical advantage. With the side rolls all the way in, you have the least mechanical advantage. So, a machine has the capability of rolling 2-inch-thick material with the maximum mechanical advantage, but a job is only 1/2 inch thick. Reduce the mechanical advantage and one has a machine that can roll from 1/2 to 2 inches thick.A plate rolling machine is a machine that will roll different kinds of metal sheet into a round or conical shape. It can be also called a [roll bending machine", [plate bending machine" or [rolling machine".
There are different kinds of technology to roll the metal plate:
.Four-roller machines have a top roll, the pinching roll, and two side rolls.
The flat metal plate is placed in the machine on either side and "pre-bent" on the same side. The side rolls do the work of bending. The pinching roll holds the plate.
.Three-roller machines (variable pitch aka variable geometry) have one pressing top roll and two pressing side rolls.
The three-roll variable pitch works by having all three rolls able to move and tilt. The top roll moves in the vertical plane and the side rolls move on the horizontal plane. When rolling, the top roll presses the metal plate between the two side rolls. The advantage of having the variable three roll is the ability to roll many thicknesses and diameters of cylinders.
For example; The side-rolls are what produce the mechanical advantage. With the side rolls all the way open, one has the maximum mechanical advantage. With the side rolls all the way in, you have the least mechanical advantage. So, a machine has the capability of rolling 2-inch-thick material with the maximum mechanical advantage, but a job is only 1/2 inch thick. Reduce the mechanical advantage and one has a machine that can roll from 1/2 to 2 inches thick.
After many years of development, ground-source heat pumps in Henan Province have made great progress. The basic work has been continuously strengthened, and the type of heat pump development has been adjusted. However, it is still necessary to be vigilant about the “breasting†of the development of large-scale projects.