Stacker is the main lifting and transportation equipment in the three-dimensional warehouse. Is with the development of three-dimensional warehouse special lifting machinery and equipment. The use of this equipment for warehouses up to 40 m. Most of the 10 ~ 25m between. The main purpose of the stacker is in the three-dimensional warehouse aisle shuttle run back and forth. Will be located in the aisle mouth of the goods into the cargo compartment. Or the goods in the cargo compartment out of the transportation to the entrance of the aisle. This equipment can only run in the warehouse. Other equipment is needed to allow goods to enter and exit the warehouse.

Stacker belongs to the three-dimensional warehouse in a number of storage equipment, can greatly enhance the efficiency of goods storage, is a three-dimensional warehouse can have a high-efficiency operation of the guarantee. But according to the actual operating environment is different, the aisle stacker cranes are divided into a variety of types, the following we come to do a specific understanding of it.

Depending on the structure of the stacker cranes, they can be simply categorized into single-column stacker cranes and double-column stacker cranes:

01. Single column stacker cranes
Single-column stacker cranes are mainly composed of lifting frame (loading platform), column, bottom crossbeam (traveling mechanism), lifting drive, lifting chain, transmission sprocket assembly, control box, electrical control device and computer management system.

The columns are bolted perpendicular to the bottom beam and form the main frame of the stacker. The bottom beam is equipped with a walking wheel assembly and a guide wheel assembly at the head and tail of the bottom beam (see figure below); the top of the column is also equipped with a guide wheel assembly, which allows the stacker frame to travel along the track without tipping over. The travel wheels on the bottom beam are connected to servo motors via gearboxes, which drive the travel wheels to allow the stacker frame to move horizontally along the track mounted in the center of the aisle.

The lifting frame is located inside the stacker frame and is guided by guide wheels to ensure that it can only move up and down along the columns.

The lift drive is fixed to the outside of the column. There are 2 lifting chains that can be driven by the sprocket assemblies inside the lift drive, which are fixed to the upper and lower ends of the lifting frame, after the chains have been wrapped around the sprocket assemblies at the top of the column and the side of the lower crossbeam. In this way the lift drive can drive the lift frame up and down. The lifting frame is equipped with a fork mechanism, which allows the goods outside the stacker crane to be taken into the lifting frame by means of the forks. Combined with the horizontal movement of the bottom crossbeam, the stacker cranes enable goods to pass through the aisle to any position on the shelves on either side of the aisle as permitted by the design.

Single column type stacker cranes use a rectangular frame structure, consisting of a column and two beams, although the frame structure will be a little worse in terms of strength, but more flexible, the lifting weight is generally below 2 tons, suitable for small objects lifting, lifting height is also generally within 16 meters.

02. Double column stacker cranes
Double column stacker cranes are mainly composed of lifting frame (loading platform), column, upper crossbeam, lower crossbeam (traveling mechanism), lifting drive, lifting chain, transmission sprocket assembly, counterweight assembly, control box, electrical control device and computer management system.

The upper crossbeam, lower crossbeam and two parallel columns are bolted together to form the main frame of the stacker. The lower crossbeam is equipped with a running wheel assembly and a guide wheel assembly at the head and tail of the lower crossbeam (see figure below); the upper crossbeam is also equipped with a guide wheel assembly at the side to allow the stacker frame to travel on rails without tipping over.

The lifting frame is located on the inside of the stacker frame and is guided by guide wheels to ensure that it can only be moved up and down between the upper and lower beams by extending the columns.

The lift drive is fixed to the outside of one of the columns. Four lifting chains can be driven by the sprocket assemblies in the lift drive, which are fixed to the upper and lower ends of the lift frame after wrapping around the sprocket assemblies on the sides of the upper and lower beams. This allows the lift drive to drive the lift frame up and down.

The counterweight assembly is mainly used to balance the weight of the lifting frame and the forks to reduce the force required to lift the goods. The horizontal freedom of the counterweight assembly is also limited by the sliders in the track of the frame, which are connected with the lifting frame through the counterweight chain and move in the opposite direction to the lifting frame. The sliders are made of special polymer material and do not need to be replaced for life.

The double column stacker is composed of two columns and two beams, the structural stability and strength have been improved to a lot of extent compared with the single column type of aisle stacker, and the weight is heavier than that of the single column type, so the stability of the equipment is stronger. It can be used in a variety of lifting heights for lifting operations, lifting weight can reach 5 tons, and can increase the lifting weight according to the actual situation.

The main purpose of the stacker cranes is to operate in the aisles of a three-dimensional warehouse to deposit the goods located at the aisle entrance into the cargo compartments or to remove the goods from the cargo compartments and transport them to the aisle entrance. The stacker crane moves in three dimensions in the X, Y and Z directions in the three-dimensional warehouse by realizing the function of picking up and delivering goods.

The three driving mechanisms of walking, lifting and forks are used to complete the operation requirements. The international advanced servo control system and absolute addressing system are adopted for the full closed-loop control to realize the high-precision operation of the stacker cranes by cooperating with the high-precision addressing methods such as barcode or laser distance measurement.

Stacker cranes are a kind of warehouse equipment, the emergence of stacker cranes reduces the labor intensity of workers and improves the utilization rate and turnover rate of the warehouse. With the progress and development of science and technology, stacker cranes can make enterprise warehouse management become more intelligent and easy, greatly increasing the efficiency of warehouse management.

Stacker features:

◆ The whole structure of the stacker is high and narrow. It is suitable for running in the alleyway.

◆ The stacker has special fetching device. Such as forks, manipulators, etc.

◆ The electric control system of the stacker is characterized by fast, smooth and accurate. Ensure that the goods can be taken out and deposited quickly, accurately and safely.

◆ The stacker has a series of chain protection measures. Due to the narrow working place, a little inaccuracy will destroy the warehouse, so the stacker is equipped with a series of mechanical and electrical protection measures.

Advantages of stacker cranes:

1. Stacking efficiency can be improved

The stacker cranes can be set up differently according to different stacking requirements, ensuring that each stack can be maximized. In addition, the stacker can ensure the high quality of the products, even if more stacking operations are carried out, the integrity of the products can be guaranteed.

2. Effective removal of waste materials from stacking operations

In most of the stacking operations, a lot of impurities and wastes will be generated, many traditional stacking equipment is difficult to deal with these wastes, so it will cost a lot of labor to deal with these wastes. The latest stacker cranes can solve this problem well, with the new waste automatic exit system, as long as you make some settings, you can separate the waste from it, which is convenient for warehouse managers to deal with the waste.

3. Multi-functions and strong adaptability

The requirements for stacking operation are different for materials of different nature. When stacking operation is carried out, users can flexibly set up the stacking process according to different needs, and through the setting of different parameters of the stacking operation, it can be used to ensure that the integrity of different materials will not be damaged.

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