Analysis of the relationship between the transmission angle of the compound pendulum jaw crusher and the discharge opening

In the existing data, there is rarely a description of the relationship between the drive angle of the jaw crusher and the size of the discharge opening, which is easily overlooked by people. This article introduces the transmission angle and discharge opening of the compound pendulum jaw crusher in detail. The relationship between.

1. Influence of transmission angle on crusher performance

The jaw-link mechanism of the jaw crusher is a key factor in determining the performance of the crusher. The angle between the jaw crusher linkage (moving jaw) and the bracket is called the transmission angle, which has a great influence on the movement path and transmission efficiency of the moving jaw.

When the eccentricity is constant, as the transmission angle increases, the transmission efficiency increases, the dynamic stroke ratio also increases, the running characteristics of the moving jaw deteriorate, and the wear of the lining plate increases; when the transmission angle decreases, the transmission efficiency also decreases. With the decrease, the moving stroke ratio is reduced, the moving motion characteristics are improved, the lining wear is reduced, and the vertical upward force component of the bracket is also increased, which tends to accelerate the wear of the guide rails on the bracket.

2. The relationship between the transmission angle and the discharge opening

The relationship between the transmission angle and the discharge opening to be discussed here refers to the relationship between the minimum to maximum change of the discharge port size and the transmission angle according to the product grain size requirement.

Figure 1: Schematic diagram of the horizontally adjusted jaw crusher crank connecting rod

(1) As shown in Fig. 1, the horizontally adjusted jaw crusher has a transmission angle that increases as the discharge opening increases, and the better the moving characteristics of the movable jaw, the higher the transmission efficiency.

(2) As shown in Fig. 2, when the jaw crusher is tilted, the transmission angle decreases as the discharge opening increases.

Figure 2: Schematic diagram of the crank-link mechanism of the jaw crusher of the tilting movement adjustment seat

However, the above two conclusions are based on two structural diagrams, and actually need to be verified by theoretical calculations.

3, transmission angle calculation

According to the triangles Î”ABC and Î”ACO given in Fig. 1, one side AC is shared, and AC=L is set. According to the cosine theorem of the triangle, the transmission angle Î³ can be obtained. According to the final calculation results, it can be concluded that the horizontally adjusted jaw crusher has a transmission angle that increases with the discharge opening, and when the jaw crusher is tilted, the transmission angle decreases with the increase of the discharge opening. small. Explain that the conclusions drawn from the previous mechanism diagram are correct.

According to the above-mentioned layer proof, we have obtained the variation law between the discharge opening and the transmission angle, that is, when the transmission angle is increased, the movement characteristics of the moving jaw are better, and the breaking stroke is reduced; when the transmission angle is reduced In hours, the breaking stroke of the moving jaw increases, and its mobility deteriorates.

According to the above conclusion, the Red Star machine selects its transmission angle and adjustment form according to the different usage requirements and direction of the crusher when designing the crusher mechanism. Generally, the larger transmission angle adopts the horizontal adjustment form, which is mostly used for the low-power, low-yield, fine-grain jaw crusher. Conversely, the smaller transmission angle generally adopts the inclined adjustment mode, which is mostly used for high power and high output. Jaw Crusher.

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