As the primary crushing equipment of ore, jaw crusher has been widely used in various mining industries. Jaw crusher crushed ore discharged from the discharge port, the size of the discharge port determines the size of the crushed ore particle size. In addition, the size of discharge port is different, the production capacity of jaw crusher is also different, at the same time, it also determines the size of feed granularity of the secondary crusher, thus affecting the crushing condition and production capacity of the secondary crusher.

With the accumulation of the running time and the continuous wear of the toothed plate, the size of the discharge port will become larger and the particle size of the product will also become coarser. In order to meet the requirements of product granularity, the size of discharge port must be adjusted regularly by using the adjusting device; at the same time, when the product with different particle size is required for production, the size of discharge port also needs to be adjusted.

At present, different jaw crushers with different structures have different discharge port adjustment modes, which are mainly divided into gasket type, wedge type and oil cylinder type.

a) Insert the gasket from behind the jaw

The adjusting gasket is inserted from the rear of the crusher. The length of the gasket is short and the weight is light. The operating space of the operator is limited and it is not convenient to replace the gasket.

b) Insert the gasket from the side of the jaw

The adjusting gasket is inserted from the side plate of crusher, and the gasket is long and heavy. The operating position of operators is better and safer.

The gasket adjustment is relatively simple, but it is often inconvenient. It is difficult to adjust the discharge port by adding or subtracting gaskets. It needs to be placed close to the crusher. On the one hand, it takes up space, on the other hand, it also prevents loss. It can not be adjusted steplessly or automatically by hydraulic means. Wedge adjustment

The wedge block type adjusting device is mainly composed of two identical wedge blocks. The wedge block is located at the back of the bracket seat in the adjusting seat, and the inclined planes of the two wedge blocks are relative to each other. By changing the relative positions of the two wedge blocks, the total thickness of the wedge block pair can be changed, so that the front and rear positions of the lower part of the movable jaw are moved to realize the change of the size of the discharge opening.

a) Mechanical adjustment

Mechanical adjustment mode, that is, the movement of wedge block is realized by manually turning the adjusting screw. The adjusting screw is located on both sides of the crusher. One end of adjusting screw is connected with wedge block through pin shaft, and is installed on both sides of side plate of crusher frame by adjusting nut and support. When it is necessary to adjust the discharge port, the wrench is used to rotate the screw on both sides of the frame to pull the wedge block, change the relative position of the two wedge blocks, and then change the total thickness of the wedge block to achieve the purpose of adjusting the size of the discharge port.

b) Hydraulic adjustment

The hydraulic adjustment mode is to change the adjusting screw in the mechanical adjustment mode into the hydraulic cylinder, and the adjustment of the tension spring is realized by the hydraulic cylinder, so as to realize the automatic adjustment of the discharge port, which is convenient and labor-saving.

Wedge adjustment can achieve stepless adjustment, convenient adjustment, save time, no need to stop adjustment, but increase the size and weight of the machine. This kind of adjustment device is often used in small and medium-sized broken jaw.

Hydraulic cylinder adjustment

The structure of the discharge port adjusting device of the hydraulic cylinder is shown in the following figure, which is equivalent to installing a large oil cylinder in the middle of the elbow plate, so that the length of the elbow plate can be adjusted steplessly, so as to change the front and rear position of the movable jaw and realize the adjustment of the discharge port size.

The discharge port adjusting device of this structure can not only Automatically adjust the size of discharge port And it can realize the function of passing iron and clearing cavity, which can greatly improve Easy to operate, reduce labor intensity 。 This jaw crusher The manufacturing cost will be higher, and the operation and maintenance skills of workers are required to be higher.

To sum up, the gasket type is the simplest, but the operation is inconvenient; the wedge block type can realize automatic adjustment, and the operation is more convenient; the hydraulic cylinder type can not only automatically adjust the discharge port, but also realize the functions of iron passing and cavity cleaning, which is convenient to use and reduces the labor intensity of operators. At present, the gasket type and wedge block type are more and m