Dock Shelter & Seal: Used for seal between dock and truck containers. It can protect goods and avoid exterior air and dust entering the room during the loading and unloading process. 

GECE offers three different models of dock shelter. They are fit for different situation. You can check below details and make a choice.

Type No.1. Retractable Dock Shelter or Seal (Basic model, most widely used)

Fit for loading docks working with different types of trucks. It can fit containers of various sizes.It is retractable design. Two parallel steel tubes form the main skeleton. When trucks touch the shelter, it will retract flexibly and join closely with trucks of different types. After trucks leave, it will recover automatically under self-weight effect. Thus, it is a good choice if your truck containers are in different sizes.

Type No.2. Thermal Insulated Dock Seal (Insulated model, for uniform size truck or container)

Fit for loading docks working with uniform trucks with containers of same or similar sizes. It can realize effective seal and thermal insulation.

1.     The back structure is made from galvanized steel plate or anti-corrosive solid wood, touching with the wall closely. Inside is filled with highly compressed sponge, with density of 30KG/m³. Special pressure-relief design can reduce the friction with dock and trucks. This will prolong work life of surface fabric.
2.     Surface fabric:Made from PVC fabric with self-extinguishing function. Weight: 800g/?. There are fabric shutter folds on top beam and two side columns. Thus it can endure long-time friction and squeezing.

Type No.3. Inflatable Dock Shelter or Seal (High-grade model, for high-demanding projects)

It is the most advanced and most high-end dock seal. 

• Fit for various container sizes: Adopt the PVC fabric material as the airbag. When working, the motorized air pump motor blow air into the joined air bags, to fill the space between door and truck containers. It can work for trucks with various container sizes.

• High airtight and thermal insulated:  Inflatable dock shelter adapts accurately to various size of lorry or containers. It offers excellent sealing performance and prevents outdoor heat entering warehouse. Thus it is fit for areas with very high demand for thermal insulation and air-tightness, like food and pharmaceutical warehouses.

GECE Dock shelters are available up to 3400x3400 mm (higher sizes optional).

Dock leveler allso known as Dock Ramp or Loading Ramp, widely used in loading bays of logistics centers, warehouses and dispatch area of factories. In most cases, the container floor of truck will not be on the same level with loading bay floor. And this lead to that, forklifts or trolley can not be used to load or unload goods into container. It will take much labor to move the goods by hand. This will be very low efficient.

But with a automatic dock leveler, such problem with be solved perfectly. The stationary fixed dock leveler will be placed into a pre-built concrete pit on the loading bay. A hydraulic motor drives the platform up and down, realizing seamless joint between room ground and truck floor. Then,forklifts or trolleys can transfer goods quickly on the dock leveler platform. Thus it improves the loading&unloading efficiency obviously and also save much labor. 

Sizes of GECE Dock Levelers: Customized sizes acoording to your need. We suggest three mostly used sizes:

• Width=1830mm, Length=2000m, Height=500mm;

• Width=2000mm, Length=2000m, Height=500mm;

• Width=2000mm, Length=2500m, Height=500mm;

Loading capacity: Dynamic load capacity: 6000KG; 10000KG or 15000KG

Hydraulic motor: 

1. Power supply :3-phase 380V/50Hz 

2. Output power:0.75KW-1.5KW;

3. Top China brand or Italy brand (customised);

4. Overheating self-protection function.

Control Panel: Multiple-function controller, with three functional parts:

• Operation button: press one time, the whole procedure started until finish;

• Power-switch button: switch off power easily when necessary, like work-off, daily maintenance, or repairing;

• Emergency stop button: it can stop the dock leveler immediately when there is something emergency. This can help protect workers and avoid accidents;

Platform: 

1. Surface sheet:6mm-8mm thick according to loading capacity;

2. Whole-piece steel sheet, rather than welded joined sheet like competitors, with much higher strength and work life;

3. Underneath support: high-density steel tube or C-channel to support the surface sheet.;

4. Surface treatment: blasting and powder coating, with high rust proof performance

Painting colour: Blue, Grey, Green, or customized according to client choice.

GECE Rolling shutters with high-strength galvanized steel slats. It is wind-resistant and suitable for all kinds of factories, commercial buildings, and garages.

Features of GECE Rolling Shutters:

Stable operation, good wind resistance and burglarproof performance.

1. Excellent wind resistance: GECE Slat is formed with cold-processing from galvanized steel material and made into special arc section. The elevation structural strength is improved by 85%.  The thickness reaches 0.8mm to 1.2mm thick.

2. Advanced driving system: In-built limit device controls running precisely; Overload-protection module will stop motor from running when there is jamming or overheating, to protect the motor. 

3. Anti-corrosive: GECE Slats and guide rails are made from galvanized steel. And surface is treated with electrostatic powder coating as addtional choice for further protection.

4. Convenient operation methods: GECE Every door is equipped with a set of control button box and two remote control units for daily operation. The button box is with UP, STOP and DOWN buttons, and  wall mounted near the door.  The remote control can operate the door from a distance up to 100m. 

5. Auto-Manual dual operation modes: When there is power failure or breakdown, the door can be opened or closed by manual operation chain very easily.

GECE Shutters are available in Mild steel, Galvanised Iron, Polycarbonate, Aluminium and Powder coated finish up to 12000x12000 mm with automatic or manual operation.

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A blast furnace (BF) is a multi variable system which is subjected to a large number of inter-influencing variables affecting its performance: productivity and coke rate.

A world class blast furnace operation demands the highest quality of raw materials, operation, and operators. Coke is the most important raw material fed into the blast furnace in terms of its effect on blast furnace operation and hot metal quality. A high quality coke should be able to support a smooth descent of the blast furnace burden with as little degradation as possible while providing the lowest amount of impurities, highest thermal energy, highest metal reduction, and optimum permeability for the flow of gaseous and molten products. Introduction of high quality coke to a blast furnace will result in lower coke rate, higher productivity and lower hot metal cost.Coke rate is the parameter for the consumption of BF coke which is measured in kilograms of BF coke consumed per ton of hot metal produced.

Blast furnace (BF) coke is a key material for BF iron making, acting as a major energy source (fuel), a reductant, a carburization agent and a permeable structural support. There is no other satisfactory material available, which can replace, fully or partially, BF coke as a permeable support of blast furnace charge.

A good quality coke is generally made from carbonization of good quality coking coals. Coking coals are defined as those coals that on carbonization pass through softening, swelling, and re solidification to coke. One important consideration in selecting a coal blend is that it should not exert a high coke oven wall pressure and should contract sufficiently to allow the coke to be pushed from the oven. The properties of coke and coke oven pushing performance are influenced by following coal quality and battery operating variables: rank of coal, petrographic, chemical and rheologic characteristics of coal, particle size, moisture content, bulk density, weathering of coal, coking temperature and coking rate, soaking time, quenching practice, and coke handling. Coke quality variability is low if all these factors are controlled. Coke producers use widely differing coals and employ many procedures to enhance the quality of the coke and to enhance the coke oven productivity and battery life and the performance of the Blast Furnace.

·Decreasing of fines content in the charge materials improves the coke rate of the blast furnace in the range of 0.4 % to 0.7 %.

·High top pressure also reduces the coke rate in the blast furnace. With every increase of top pressure of the blast furnace by 0.1 kg/sq cm there is a reduction of around 0.1 % in the coke rate.

·Properties of slag have considerable effect on the coke rate. Lower specific volume of slag of lower viscosity improves the coke rate of the blast furnace.

·Automatic process control improves the furnace productivity since it minimize consumption of reluctant, avoids furnace process disturbances such as hanging, slipping, scaffolding, gas channeling etc through an immediate counteraction by the system, stabilizes hot metal and slag parameters etc. The effect of automatic process control on the blast furnace coke rate is in the range of 3 % to 5 %.

·Control of burden distribution plays an important role in the reduction of the coke rate in a blast furnace. The burden distribution control ensures a stable burden descent, adjusts the flow of gases in the wall (this avoids high heat loads without generating inactive zone) and helps in achieving a good solid gas contact.

Roll Pass Design

Roll pass design is based on the characteristics of initial input (weight of billet/bloom, steel grade, and steel temperature before and during the course of rolling), characteristics of finished rolled product (dimension of section, tolerances and specification concerning to mechanical properties, and surface finish of rolled product), and characteristics of the rolling mill (number of stand, roll diameter, strength of rolls, rolling speed, available power of the drive motor, and available mill equipment). Other factors which are of important considerations for good roll pass design are rolling load, draft, strain, and rate of heat transfer which do affect the condition of plastic flow of steel material. Further shape of a section in a particular pass must ensure a free flow of steel in the roll gap/groove. Selection of appropriate taper/groove angle in the pass is necessary in order to avoid jamming of steel material in the rolls.

Roll Pass design is a set of methods for determining the dimensions, shape, number and type of arrangement of rolling mill passes.

Roll pass designing also includes the calculation of pressing forces and their distribution on the roll passes. Only section iron is rolled between the shaped rolls. Sheets and wide strips are pressed between roller switch a smooth cylindrical or barrel-shaped surface.

Several passes are made for each section; a square or round billet acquires a specified form on each successive passage.

The roll passes are designed to avoid excessive stresses in the metal being rolled, since such stresses could lead to the formation of cracks and other flaws.

Roll pass design is an essential part of long product rolling process, since the long products are rolled between the shaped rolls in the long product rolling mills. Roll pass design generally means the cutting of grooves in the roll body through which steel to be rolled is made to pass sequentially to get the desired contour and size.

The primary objective of the roll pass design is to ensure production of a product of correct profile within the tolerance limits, free of defects, with good surface quality and the required mechanical properties. In addition, economic condition must be achieved while rolling the product, for example, maximum productivity at the lowest cost, optimum energy utilization, easy working conditions for the rolling crew and minimum roll wear.

OBJECTIVE OF ROLL PASS DESIGN

·        Steel sections are generally rolled in several passes, whose number is Determined by the ratio of initial input material and final cross section

          Of finished product.

·        The cross section area is reduced in each pass and form and size of the stock gradually approach to the desired profile.

·        Production of correct profile within tolerance limits with good surface finish (free from surface defects).

·        Maximum productivity at lowest cost.

·        Minimum roll wear.

·        Easy working.

·        Optimum energy utilization.

Basic Requirement for Correct Roll Pass Mill

·        The number and arrangement of passes in particular roll stand should assure the most uniform possible exploitation of all the passes in each stand.

·        Uniform draught in last passes & different draught in early forming passes of profile, where the section is large & metal is hot.

·        Draught should be distributed so as to ensure as far as possible

          Uniform wear and to avoid overloading of drive installations and

          Rolls.