The paper industry is a high investment industry. The large papermaking machine, coating machine and completion equipment basically depend on the import, and almost all the import of the whole production line. The country spends a lot of foreign exchange every year for the purchase of paper equipment. In order to change this situation, the state has issued some policies to encourage domestic enterprises to carry out technical problems in papermaking equipment and to improve the localization rate of large paper equipment as far as possible. Over the years, we has been making a fruitful research in the field of paper making and ventilation, and has been successful in the research, production and use of the main paper ventilation equipment. They mainly include the closed air cover of the drying section, the blowing box of various functions in the air cover, the air heat recovery device of the air cover, the draught of the wet part of the paper machine and the supporting equipment, the conveying equipment on the paper side, the unit type ventilation unit of the workshop and so on.

一、干燥部密闭气罩

The closed hood of the drying section.

干燥部密闭气罩在纸机通风系统中价值是最高的，它是造纸设备中一个非常重要的设备。密闭气罩的设计必须满足下面的功能：

The closed hood of the drying section is the highest value in the paper machine ventilation system, and it is a very important equipment in the paper making equipment. The design of the airtight hood must satisfy the following functions:

1．提供一个封闭的高温环境，以利于纸页的干燥及降低排风量，提高气罩排风热回收的效果。国际上最流行的设计是气罩内干球温度为80一85 ℃，露点温度为 58一62℃。

1. provide a closed high temperature environment to facilitate the drying of the paper and reduce the discharge volume and improve the effect of heat recovery of the hood. The most popular design in the world is the dry bulb temperature in the hood, 80 to 85 degrees, and dew point temperature of 58 to 62 degrees Celsius.

2．密闭气罩必须为对纸机运行状况的监视、操作和维护提供方便，必须能方便地引纸和换辊。

2. the airtight hood must provide convenience for the monitoring, operation and maintenance of the paper machine. It must be able to facilitate paper transfer and roll change.

3．密闭气罩内高温高湿，特别容易引起结露，气罩的设计必须完全杜绝气罩顶板的凝露滴水。

3. the high temperature and humidity in the airtight hood is especially easy to cause condensation. The design of the hood must completely eliminate dew condensation on the roof of the hood.

4．尽可能地使气罩内的气体不散发到车间。

4. as far as possible, the gas in the hood will not be distributed to the workshop.

5．密闭气罩应能调节纸机纵向排风量，以保证纸幅各个干燥部位所需的排风量。

5. the airtight cover should be able to adjust the longitudinal exhaust volume of the paper machine to ensure the volume of exhaust needed for each part of the paper.

6．密闭气罩应充分考虑照明、消防等设施，以满足各方面的需要。

6. airtight gas hood should fully consider lighting, fire and other facilities to meet all aspects of needs.

7．密闭气罩在造纸车间内所占面积很大，因此，气罩的外观必须美观、耐用。

7. the airtight cover is very large in the paper making workshop. Therefore, the appearance of the gas hood must be beautiful and durable.

为了密闭气罩能够满足上述功能，我们广泛吸收世界上各式气罩的长处，精心、细致、周全地设计了我们的气罩。 1．我们的密闭气罩为一个模块化设计的封闭结构，为了能使气罩内干球 温度为80—85℃，露点温度为58—62℃的高温高湿气体不结露滴水，气罩顶板、端板、侧板均为三明治结构，内板和外板均为防锈铝板，中间为硬质离心玻璃棉板。板与板之间采用“迷宫式”连接方式，以最大限度地消除“冷桥”。面板可以是正弦波纹板，也可以是梯形波纹板，外观均非常漂亮，完全可以根据用户的要求选定。

In order to meet the functions of the airtight aircover, we have extensively absorbed the advantages of various types of air cover in the world and designed our air cover carefully, carefully and carefully. 1. our closed air cover is a closed structure of modular design. In order to make the dry ball temperature of 80 to 85 degrees centigrade, the dew point temperature is 58 to 62 C, the high temperature and high humidity gas is not dehumed. The roof, end plate and side plate of the air cover are all sandwiches, the inner plate and the outer plate are all antirust aluminum plates and the middle is hard centrifugal glass. Cotton board. The labyrinth connection is used to eliminate the "cold bridge" to the maximum extent. The panel can be a sine wave plate or a trapezoidal corrugated plate. The appearance is very beautiful, and it can be selected according to the requirements of users.

2．密闭气罩在操作侧设通长的电动提升门，一个提升门高为2.5米，长一般为6米。提升门上设有通长的隔热玻璃窗。传动测设有滑动门，滑动门上也装有隔热玻璃观察窗。气罩内，纸机的运行状况一目了然。提升门设有与断纸信号连锁装置，一旦断纸提升门自动提升，提升门的升降还可以在控制台上手动操作。操作侧面板上开有更换辊子的手动门，为了方便换辊，气罩内设有纵向和横向的手动葫芦。提升门本体设有断绳保护装置，提升门本体安全又可靠，所有的操作都非常方便。

2. the airtight hood is equipped with an electric lifting door on the operation side. The height of a lifting door is 2.5 meters, and the length of the lifting door is generally 6 meters. The lifting door is equipped with a long insulated glass window. The sliding door is equipped with a heat insulation glass observation window. The operating condition of the paper machine is clear at a glance. The lifting door is equipped with a paper breaking signal interlocking device. Once the paper lifting door is automatically lifted, the lifting door can also be manually operated on the console. A manual door for changing the rollers is arranged on the operation side plate, and a vertical and horizontal manual hoist is arranged for the purpose of convenient roll change. The lifting door body is provided with a broken rope protection device, and the lifting door body is safe and reliable, and all operations are very convenient.

    3. 为了能使气罩在提升门打开时，气罩内的热湿气体不溢出来污染车间环境，同时，也不让车间内冷空气大量地进入气罩影响气罩内的高温环境。在气罩上设有“零位”控制装置。“零位”设在提升门的上沿处； 在这一位置上，因为压差为零，所以气罩内外的气体不流动。在“零位”以下，空气是从罩外向罩内流动，“零位”以上，空气是从罩内向罩外流动，所以，为了防止气罩内的气体流出来，提升门上沿以上的罩体，密封性应非常好。“零位”的高低取决于气罩送风量和排风量的大小，排风量的大小是通过检测排风中的含湿量来控制。“零位”是通过装在罩体上的“零位”检测装置控制送往气罩内的热风量大小来调节的。

In order to make the air cover open in the hoist door, the hot and wet gas in the air cover does not spill out to pollute the workshop environment. At the same time, the cold air in the workshop is not allowed to enter the air cover to influence the high temperature environment in the air cover. 3. There is a "zero position" control device on the air cover. The zero position is located at the upper edge of the lifting door; in this position, because the pressure difference is zero, the gas inside and outside the hood is not flowing. In the "zero position", the air flow from the cover to the cover, "zero position" above, the air flow from the cover to the cover, so, in order to prevent the gas flow out of the gas cover, the hoist up the door above the door, the sealing should be very good. The height of the zero position depends on the size of the air supply and discharge volume of the hood. The size of the exhaust volume is controlled by detecting the moisture content in the exhaust. The zero position is adjusted by the zero position detection device installed on the cover to control the amount of hot air sent to the hood.

4. 密闭气罩内装有完整的低压照明系统和自动灭火系统，以满足消防、照明要求。

4. there is a complete low pressure lighting system and automatic fire extinguishing system in the closed gas hood to meet the requirements of fire and lighting.

综上所述，我们为用户提供的是一个性能优良、功能完备、操作简单、外形美观的优质产品。

To sum up, we provide a quality product with excellent performance, complete functions, simple operation and beautiful appearance.

二、纸机运行所需各种吹风箱

Two. All kinds of blower boxes needed for the operation of the paper machine

在现代化纸机上，由于密闭气罩的采用，必须用低温高温的空气来平衡气罩的排风，为了能使纸幅高速平稳地运行，同时为了改善纸幅的横向水分分布，根据纸种和车速不同，设有各种不同功能的吹风箱。

In modern paper machine, due to the use of airtight aircover, it is necessary to balance air exhaust air with low temperature and high temperature air. In order to make the paper running at a high speed and smoothly, at the same time, in order to improve the horizontal water distribution of the paper width, there are various kinds of blowboxes with different functions according to the different kinds of paper and the speed of the car.