Donghe Strip Manufacture Co., ltd.
Add.: Jiangsu Province, China.
Tel.: +86-510-83796898
+86-510-83796778
Fax: +86-510-83790988

Certificates
Certificates
ISO90012000 Quality Management System Certificate ISO9001:2008 Certificate
(Chinese Version)
ISO9001:2008 Certificate
(English Version)
Private Technology Enterprise
Certificate
City-Level High-Tech Enterprise Certificate High-Tech Product Certificate
Patents

Patent for the Invention of Silicon Steel and Plain-Carbon Steel Continuous Annealing Furnace Door Sealing Assembly
This utility model discloses a silicon steel and plain-carbon steel continuous annealing furnace door sealing assembly. It is comprised of the first furnace door and the second furnace door. Between the two doors an enclosed cavity is formed. On the outer wall of the cavity there is a shielding-gas inlet. The upper and lower sides of both doors are respectively provided with sealing block. Beneath the lower sealing block is fitted with a supporting plate. A clamping plate is attached to the outer side of the lower sealing block. The back-up roll is connected to the outer side of the clamping plate. The outer side of the upper sealing block is also attached with a hold-down clamping assembly. This sealing device features a unique door design with double sealing cavities, which enables improved sealing performance. The seal is durable, and costs less to operate and construct. With an enhanced quality, our sealing device has prolonged use life and requires limited repair thereby saving repair cost. The whole structure is simple and dependable.

Patent for the Invention of Suction Squeezing Roller
This utility model discloses a suction squeezing roller, which is comprised of two identical roller squeegees arranged side by side. Each of the said roller squeegee is made up of the roller core, roller sleeve and spindle noses. The roller core is typically cylindrical in shape. It is coated in the roller sleeve. There are two spindle noses at both ends of the rotating shaft. The said roller sleeve is made of elastic and water absorbent materials full of micro through holes. On the surface of the said roller core, there are evenly distributed small holes. The spindle noses on the same side of two roller squeegees are connected with the two ends of the three-way hose. The remaining end of the said hose is connected to a vacuum cleaner. This invention provides enhanced product quality, extended use life, and reduced repair cost. Its simple, dependable structure is easy to maintain and operate.

Invention Patent for Five Partitions Cooling System for Continuous Annealing Furnace
This utility model discloses a cooling system for continuous annealing furnace. It is comprised of the air blower, air inlet pipe, air discharge pipes, control valve, cooling chamber and heat exchanger. The air blower is installed on the upper part of the cooling chamber. The air is drawn in from the top opening of the chamber. Then it enters the cooling chamber via the air inlet pipe. There are two discharge pipes in the cooling chamber for respectively cooling the front and back side of the strip steel. The air pipes at the air inlet position where the air inlet pipes are connected with air discharge pipes are divided into five partitions in the horizontal direction. Each section is respectively provided with a control valve. On the top of the said cooling chamber is installed the heat exchanger. The horizontal partition of air pipes leaves enough space for arrange. The air discharge pipe can be made in large diameter to reduce the resistance to airflow and improve the efficiency of air blower. There is also enough space for the installation and of control valve.

Patent of Heat Exchanger for Radiant Tube Heater
This invention relates to a heat exchanger that is suited for use with the radiant tube heater. The heat exchanger consists of a shell with bent tubes inside. The exhaust gas produced by the radiant tube heater enters the bent tube via the tube inlet, and exits the shell though the tube outlet. The combustion-supporting gas, such as oxygen, is fed into the shell via the shell inlet, and leaves the shell through shell outlet. The bent tube is connected with the shell, but they are insulated from each other. The exhaust gas flows through the tube cavity while the combustion-supporting gas flows over the tube and through the shell cavity. Both the tube and shell are arranged in a serpentine pattern with bends. There are spiral blades installed within and across the whole length of the tube cavity and shell cavity. The said exhaust gas inlet and outlet are connected to the tube. The said combustion-supporting gas inlet and outlet are also connected to the shell. In this way, the waste heat from the radiant tube heater can be put to use. This is an efficient way to conserve energy and protect environment.

Patent for the Invention of Roll Coater for Color Coating Line
The utility model discloses a roll coater for color coating line. It is comprised of applicator rollers, applicator roller control, pick-up rollers, a pick-up rollers control, metering rollers, and metering roller control. The two sets of applicator rollers and pick-up rollers are staggered, or in simple words, placed on alternating sides of a vertical line to form a zigzag row. The outer roller is the applicator roller. When the strip steel enters the applicator roller, an amount of space between the roller and the steel surface might be left. This clearance should be properly adjusted without affecting the clearance between the applicator roller and pick-up roller as well as between the applicator roller and metering roller. Likewise, the clearance between the applicator roller and pick-up roller should be properly adjusted while keeping the clearance between the applicator roller and metering roller unchanged.

A bearing pedestal is used for quick installation and removal of the bearing from the shaft of the applicator roller. The pedestal can be opened by loosening one bolt, to allow replacement of applicator roller. Once the new roller is installed, the bolt will be tightened.

Patent for the Invention of Water-Cooled Bearing Pedestal
This utility model discloses a water-cooled bearing pedestal. It is comprised of the outer housing and inner core. The water inlet and outlet are fitted into the outer housing. The water channel is arranged around the outer surface of the inner core by means of interference fit, whereby a sealing effect can be achieved. During the machining process of water-cooled bearing pedestal, a circular groove is cut into the circumference of the inner core via a process known as turning. Then a separator plate is welded to the middle of the groove so that the groove is divided into two sections: left and right. The separator plate and the outer surface of the pedestal core are uniformly machined to the required accuracy and roughness. The inner circle of the pedestal housing is also processed to a high level of accuracy and roughness. Water inlet and outlet holes are drilled into the upper part of the housing.

An advantage of our water-cooled bearing pedestal is its compact design. Another noteworthy feature is its precisely machined water-cooling channel, which has little resistance to the water flow, and dependable sealing performance that ensures minimum leakage.

Patent for the Invention of Telescopic Device for Horizontal Heating Furnace
The utility model discloses a telescopic device for a horizontal heating furnace. It is comprised of two lines of moveable tracks, two lines of fixed tracks and rollers. The two lines of the moveable tracks are installed on a furnace body, while the two lines of the fixed tracks are installed on a steel structure. The rollers are positioned between the moveable tracks and the fixed tracks. In addition, the weight of the furnace body is directly supported by the outer circumference surfaces of the rollers through the moveable tracks. The weight is transferred to the fixed tracks through the rollers. When the furnace body expands after heated, the furnace body drives the rollers forward along the fixed tracks through the moveable tracks. In this process, there only exists the rolling friction between the surfaces of the moveable tracks and the outer circumference surfaces of the rollers as well as the friction between the outer circumference surfaces of the rollers and the surfaces of the fixed tracks. Hence the friction resistance is lower. The furnace body can expand and contract freely, and the phenomena of internal stress and deformation can be avoided.