COLD STORAGE & WAREHOUSE DOORS
Refrigeration doors and gates are important elements of the low-temperature warehouses and refrigerated chambers, whose construction is reduced due to thermal insulation and operating costs. Typically, the refrigeration gates are selected from a wide range of types and sizes still even during the process of structural design of the cold rooms.
Types of doors for cold rooms
Medium and Low Temperature Doors
Options and Special Design of Doors
Which Refrigeration Doors to Choose?
Doors for Cold Rooms
The main purpose of doors for the cold rooms is the thermal insulation of the doorway through which the products are loaded and unloaded. Therefore, the construction, hardware of doors should not have the "thermal bridges", or reduce them to a minimum. The doors must withstand the temperature conditions and workload in the refrigerated chambers; so it is important, when choosing doors, select the right type of door and its technical characteristics: size, insulation thickness, etc.
Types of Doors for Refrigerated chambers
Depending on the operating conditions and carrying out the loading and unloading operations in refrigerated chambers and warehouses, the following are used:
hinged doors (swinging);
vertical doors (gates of guillotine type).
Hinged Doors for Cold Rooms
Swing doors are making single- or double-leafed, depended on the doorway size. As a rule, the single-leaf doors are used for a doorway up to 1.2 m; double-leafed ones are usually applied with larger dimensions. The door panel is fastened on two or more hinges, depending on the size (doorway height). The door is called "right" or "left", depending on the location of the hinges and opens to the corresponding side. Advantages of the hinged doors − ease installation and low price.
Sliding Doors for Cold Rooms
The panel of sliding doors is moved on rollers along the guide (slide-rail). They can be done with the right or left roll backing (of opening). When the gate is closed, they "sit down" and tightly press under their weight and the actions of clamping rollers, by providing the good sealing of the gate. In addition to the manual opening, the automatic electric drives are used for the sliding gates that can be activated with console and, optionally, radar, photocells, magnetic loops, a remote control.
The main advantages of sliding doors:
greater reliability and durability of sliding doors − it is a very important requirement with intensive using;
absence the "dead zone" before entering − it is convenient in the confined spaces, corridors;
clamping device and seal. The door sealing is automatic under the weight of the door itself, due to the construction of the rail and the special pressure roller;
possibility of using for the large doorways.
Vertical Gates of Guillotine Type
In that version of the door its panel rises, which is convenient, when there is no free space to open the sliding gates. Such gates are usually used with an electric drive, since they are difficult to open manually.
Medium and Low Temperature Doors
The hinged and sliding doors for refrigerated chambers differ in depending on the temperature regime:
doors of medium temperature mode (from 0 0С and above) for chambers and warehouses;
low-temperature doors for freezing chambers and warehouses (from -15 to-25 0С and below).
The Main Differences Between Medium- and Low-Temperature Doors Thermal insulation thickness of refrigeration doors depends on the specific use and can range from 60 to 160 mm. The standard thickness for medium-temperature cold rooms is 60-80 mm, for low-temperature ones − 100-120 mm. In the chambers of shock freezing of products (-30-40 0С) and the warehouse complexes with large doorways, there must be the gates with a heat-insulating thickness of 140-160 mm. Low-temperature doors must be equipped with a built-in heat tracing cable to prevent the freezing of panel to the door frame. In addition, in low-temperature doors, the construction of the frame and handle may be differing due to the need to destroy the "thermal bridges", which can be neglected in the medium-temperature mode.
Options and Special Design of Doors
Optionally, we offer various designs, such as a door trim made of stainless steel, non-ferrous metal or metal with additional polymer coatings (PVC, polyester), or protect the fabric with buffer bumpers made of metal or plastic sheets. At customer's request we equip doors with the viewing windows, to complete with the different versions of handles, locks, pressure equalization valves, protect the opening area with the various types of special buffer bumpers. The doors of specific configuration are produced for special working conditions:
Doors and gates with a doorway for the hanging rail used at meat processing plants and slaughter shops;
Hermetic sliding gates for a controlled atmosphere chamber, which is used mainly for storing fruits and vegetables.
The door for a concrete doorway is determined based on its dimensions, space limitations and operating conditions. General recommendations:
It is convenient to use swinging doors for small doorways for a person's passage;
For large doorways and doors with the intensive operation − sliding ones;
Vertical one is better to use as a last resort, when it is not possible to install or operate other types of doors.
Please contact Revacco sales office and get the best doors to suitable for your projects.
Dock levelers are available in mechanical, air powered (air bag) or fully hydraulic operation. Mechanical dock levelers suit a wide range of applications and are the lowest cost initial purchase price of the three choices. Hydraulic dock levelers provide the highest level of safety, performance and versatility. They can be interlocked with other equipment such as vehicle restraints, inflatable dock shelters, and overhead doors. They require the least amount of ongoing maintenance. Air powered (air bag) dock levelers fall in the middle of mechanical and hydraulic dock levelers with respect to initial cost to purchase and ongoing maintenance costs.
Dock Leveler Capacity:
Mechanical dock levelers are available in 25-30-35-40-45 and 50,000 lb capacities. Hydraulic dock levelers are available 25-30-35-40-45-50-60-80-100,000 lb capacities as standard. Hydraulic dock levelers can be built with higher capacities to suit unique application requirements. Refer to link Understanding capacities for detailed information.
Width of Dock Leveler Platform
There are three common platform widths 6' wide, 6.5' wide and 7' wide, nominal. 7' wide platform provides the best access for loading / unloading side-by-side pallets at the back of the trailer.
Length of Dock Leveler Platform
There are three common platform lengths 6' long, 8' long and 10' long, (nominal). 8' long is most popular platform length. Longer lengths are available to accommodate exceptionally high/low dock heights reducing the angle of incline/decline.
Dock levelers are designed to accommodate truck and trailer beds that arrive at the facility with heights that are different than the dock height of the facility. The dock leveler deck assembly pivots and rests at an angle to accommodate the variance in the truck or trailer bed height. In doing this dock leveler accommodates truck and trailer beds that are both above and below the loading dock floor height.
It is important to manage the extent of this compensation for the difference to a reasonable and desirable level. Factors that determine reasonable and desirable levels include but are not limited to the following:
The length of the dock leveler deck assembly. The longer the dock leveler deck assembly is the better it will be for accommodating dimensional differences in the truck / trailer bed heights relative to the load dock height. For example, all other conditions being equal, an 8ft long dock leveler deck assembly accommodates a greater height differences than 6ft long dock leveler deck assembly. The longer deck assembly simply reduces the angle of incline that the loading / unloading equipment (IE fork lift or pump truck) have to drive up and down as they go in and out of the truck / trailer.
The type of loading / unloading equipment being used at the loading dock. For example a gas powered fork lift truck will generally have more power and larger wheels to accommodate larger angles of incline than an electrically powered pallet truck or a manually pushed pallet truck or cart.
For obvious reasons, larger inclines create more wear and tear on equipment that is powered driven and has brakes.
Larger inclines can result impact loads applied to the dock leveler as the fork lift hits the inclined dock leveler assembly and this can overload the leveler and result in damage to the dock leveler.
Large inclines can create safety concerns due to possible run away loads. This is particularly true for manually propelled pump trucks or carts. As well, large inclines can make it onerous to push the same equipment up the inclines.
Consideration of these factors should be made at the time the loading dock is designed.
These factors should also be considered whenever changes to the factors listed above change at the loading dock.
There are 3 standard dock leveler lip lengths 16", 18" and 20" long. Ideally the lip should project 12" beyond the face of the dock bumpers. 16" lip length is standard with a 4" projection dock bumper.
Stump-out from Mechanical Fallsafe:
It is common for mechanical or air actuated dock levelers to be supplied with mechanical fall safe legs. When the dock leveler is above floor level the fall safe legs are intended to stop a loaded dock leveler from going below level in the event that the dock leveler becomes unsupported during the loading / unloading operations. While somewhat addressing the intended concern, the fall safe legs can create other concerns that occur much more frequently than the unsupported dock leveler condition that the mechanical fall safe legs are intended to address. Refer to link Stumpout - Mechanical Fallsafe Legs for detailed information
Weatherseal is available to minimize energy transfer between the closed dock leveler platform and the outside environment.
Our Primary Goal is to engineer and build the best loading dock products to ensure the ultimate in user safety and product reliability. Please Contact a Pentalift sales representative to discuss your application requirements.
Hydraulic Dock Levelers Provide Free-fall Protection for Forklifts
There is a good reason to choose a dock leveler that delivers free-fall protection by way of a velocity fuse. Without this hydraulic feature, the leveler may rapidly descend if the truck pulls away unexpectedly, which could lead to personnel injury or damage to products and capital investments.
A properly equipped hydraulic dock leveler provides the smoothest transition for your forklift driver. Its ability to prevent rapid leveler descent, even while managing heavy loads, helps maintain a safe and reasonable slope from the facility floor to the trailer bed while floating below and above dock height.
Hydraulic Dock Leveler benefits:
Infinite Lip Control which allows the operator to extend the lip or stop the platform at any time during leveler travel - this assists with loading expediency which enhances productivity and is accomplished with a dual push-button control box
Environmentally Friendly biodegradable fluid outperforms traditional industrial grade fluid, even in extreme cold
Low cost of ownership resulting from minimal required maintenance over the lifetime of the leveler
Smooth transition from the facility to the trailer for your operations, forklifts and products
Free-fall protection using velocity fuse stops to stop rapid leveler descent, even with heavy loads
Compatible with other loading dock upgrades, like dock seals and shelters
RHA Air-Powered Dock Levelers offer benefits similar to hydraulic levelers and are designed to prevent potential stump-out problems. There are no legs or rollers required so you can sense a free-fall situation. You'll also find easy access to the leveler pit for quicker maintenance.
Smooth transition design includes a constant-radius rear hinge, two-point crown control on the front lip hinge and an optimized lip chamfer to reduce jolts to your lift truck operators, product and equipment.
Vacant dock drop-off protection - Exclusive Safe-T-Lip barrier helps keep forklifts from running off the open dock and can stop 10,000 lb (4535 kg) forklifts traveling at 4 mph (6.4 kg/hr).
Exclusive Safe-T-StrutTM maintenance support system protects personnel during clean out and inspection and provides lockout/tag out capability. The unique through-the-lip design keeps the strut in place when the leveler is raised to the highest position or is impacted by lift truck.
Advanced, low-pressure lifting system - Cylindrical air tower is wear resistant for longest life.
Simple push-button operation.
Low maintenance - Lifting system requires no scheduled maintenance. Lip mechanism requires no adjustment. Access to leveler pit is easy for quick clean-out and inspection.
Reliable components - Blower motor is mounted inside the air tower for protection from the environment and wash-down applications. Simple design, few moving parts.
Seal beneath and around the dock leveler - PitMasterTM Under-leveler Seal is an available option that helps prevent energy loss, improve dock cleanliness and increase employee comfort.
12-month money-back satisfaction guarantee standard with all Rite-Hite products.
Up to 20 year money back warranty based on the Dock Leveler Investment Guide.
Mechanical dock levelers are an economical and reliable solution for basic applications.
Operation begins when a dock attendant manually pulls the release-chain lifting the leveler from the stored position. Next, the platform - which is equipped with an ergonomic system that delivers a smooth, consistent experience - is walked down onto the trailer bed.
A 9-tooth pawl and ratchet hold-down design keeps the leveler from lifting out of position during operation. It provides more surface engagement than alternatives with fewer teeth, or break-band systems, both of which can lead to hold-down engagement and mechanical issues. In the case of vertical trailer movement the leveler will float with the trailer bed as it moves below and above dock height without compromising engagement.
Should the leveler platform begin to drop unexpectedly mechanical safety legs can help stop that rapid free-fall. And if you need access to truck beds that are below dock height the safety legs can be retracted with the pull of a chain while the leveler is being positioned.
RHM Mechanical Dock Leveler Features and Benefits
Reduce repair time and cost while keeping personnel safe
Dependable lip extension helps prevent the leveler lip from taking a nose dive into the bed of the trailer while it's being positioned or stored. This also eliminates a pitched-lip scenario and the temptation to force it down.
A yieldable lip helps prevent potential damage from backing trailers if the leveler isn't stored properly.
When safety seals are broken outside of the building, and trailer doors are opened in the drive approach, environmental factors and the increased risk of unauthorized access leave goods susceptible to accidental and intentional contamination as well as pilferage. Additionally, gaps and whitespace in a loading dock design can lead to potentially catastrophic safety hazards, product damage, contamination, quality inspection concerns, and diminished employee comfort.
A vertical dock lever can help address these challenges by reducing product spoilage, theft, and costly recalls - which greatly increases safety and security in the supply chain. Learn more by contacting a representative today.