The function and classification of the silo of the large sand and gravel production line in the factory

In the crushed stone production line, the silo is almost indispensable. It is a very important part and plays the role of transfer, buffer, and adjustment. It is precise because of the existence of the silo that the crushing equipment can discharge materials continuously, evenly, and smoothly, and the production process can be carried out in an orderly and stable manner.

There are many silos in the sand and gravel production line, each of which has its own purpose, and they are not added randomly. This article introduces the functions and design points of four common silos raw material silos, transfer silos, stabilized silos before cone crushing, and product silos reference.

Raw material silo

The raw material silo is square cone-shaped, closed all around, and welded with steel plates. It is generally used before the vibrating feeder, and the common ones are single-side feeding and three-side feeding.

Raw material silos are often located on the ground, using the height difference to provide gravitational potential energy to the raw materials to facilitate the entry of large stones and the early separation of natural sand, but it is necessary to use the terrain to form a high material platform to facilitate the entry of raw materials. Another is to build a pit and transport the raw materials poured into the pit to the production workshop by the conveyor belt. This form requires less investment and is convenient for construction, but if there are too large or too sharp stones, it may cause damage to the belt, thereby affecting the entire production schedule.

Design requirements

(1) The capacity of the silo should be comprehensively considered based on factors such as the specifications of the crusher, the vehicle type for transporting ore, the loading capacity, and the interval between incoming and outgoing vehicles. Its effective volume should not be less than the output of the crusher for 15-20 minutes of continuous operation.

(2) The inside of the silo is fully covered with rails, and the rail spacing is generally 200mm.

(3) The feed side of the silo is provided with a car stop. The height and width of the car stop should allow all the ore to fall into the feeding bin and ensure the safety of unloading. The height is generally 500mm.

(4) Steel plates shall be laid on the top and both sides of the inner and outer sides of the car block to prevent it from being damaged by the mine car.

(5) The opening shape of the front wall of the silo is generally rectangular, and it can also be made into a trapezoid.

Transfer silo

As the name implies, the transfer silo is basically used for transfer. It is made of steel structure or reinforced concrete. It is located behind the crushing module. Generally, it is used to store the output of the jaw crusher and then enters the intermediate crushing link after transfer. Sometimes limited by the site, coarse crushing, medium crushing, and fine crushing are all combined, and a transfer silo is also required. The size of the silo should generally be suitable for stacking aggregates for the crushing equipment to run for 2 to 3 hours.

Why is there no transfer bin for intermediate crushing and fine crushing? It’s not that it’s not set up, and it’s also set up, but sometimes it’s not necessary, because the screening group is an integrated equipment for grading and transfer. Of course, if the site is limited and the belt conveyor is not easy to stand, it is justifiable to set up a silo.

Stable bin

The function of the stabilizer bin is mainly to play a buffer role, such as before the cone is broken. The cone crusher requires the feeding state to be full, which can form an effective material layer protection, protect the wall of the rolling mortar, and at the same time play the role of laminated crushing, and a stable material bin can ensure that there is a buffer time for emergency shutdown.

In addition, when there are multiple devices in one module, it is not necessary to bring many belts over, but evenly distribute them to the devices under all the silos through one silo.

Product silo

The style of the product warehouse is mostly a rectangular factory building, which is divided into different product rooms by high concrete partition walls (some companies also use steel plates to store sand and gravel, and the wear of the steel plate warehouses needs to be checked regularly and wear-resistant treatment should be carried out), and the products pass through the belt conveyor. Sent to the corresponding product room to achieve the purpose of grading products. In addition, the hardened space of the product warehouse for loading should be enlarged as much as possible to facilitate the loading operation, while leaving enough buffer area for the stacking area.

The above 4 types of silos are more common in crushing production lines, and production lines with different capacities and designs may be equipped with specific silos according to the actual situation.