Research on Maximum Breaking Force of Hammer Crusher

The mechanical model established by the hammer crusher for the material crushing process; for the convenience of research, the collision process should be based on the following assumptions:

1. During the crushing process, the collision of the material with the hammer is an elastic positive collision.

2. Before the collision, the hammer head rotates at the same speed as the rotor.

3. The material horizontal speed is zero before the collision.

4. At the impact, ignore the effects of friction and wind resistance.

Based on these assumptions and collision theory, a series of equations can be listed. The physical quantities required are Mi, M, Vi, V. What they mean separately is:

Mi──The mass of the first material after the collision.

M——The quality of the hammer.

Vi——The speed of the first piece of material after collision.

V ── The linear velocity at the centroid of the hammer before the collision.

According to physics knowledge, there are formulas as follows:

S1=ΣMi Vicos&,,

S1-S2=M(V-Vi),

It is required to know the following physical quantities: L0, Lc, Ai, Vi, a, b. they

The meanings indicated separately are:

L0── The moment of inertia of the rotor system to the O-axis.

Lc ─ The moment of inertia of the hammerhead on its centroid axis.

Ai── The speed of the i-th material after collision.

Vi── The angle between the collision direction.

A── The distance from the hammer hitting point to the centroid of the hammer.

B── The distance from the hammer strike point to the pin axis.

In addition, there are some auxiliary physical quantities: S1, S2. What they mean separately is:

S1 ── The collision impulse between the hammer and the material.

S2── The amount of collision backlash between the hammer pins.

According to the definition of Newton's recovery coefficient and the impulse theorem, it can be concluded that the maximum crushing force F1=S1 /S2*F2

F2── The maximum impact force of the hammer on the pin.

S1/S2── Constant irrespective of time during the crushing process (2) Experimental study on the maximum crushing force of the single-grain material hammer crusher in order to measure the maximum crushing force when the single-grain material is broken, the single-row hammer crushing In the middle of the rotor shaft, four resistance strain gauges are symmetrically bonded, and a full bridge test circuit is formed by wires.

According to the above test method, it is possible to obtain a bending strain curve on the rotor shaft when the single-particle material is broken. According to the actual measurement, the maximum stress on the curve is the line strain caused by the maximum impact force of the hammer on the pin.

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