The layered crushing is based on the operating parameters and structural parameters of the cone crusher. According to the kinematics and dynamics characteristics of the crushing material, the crushing cavity is stratified, that is, the crushing cavity is divided into several crushing zones, and the material is considered to be divided in each crushing cavity. Layer broken. The bulk material passes through each crushing zone in turn, and each time it passes through a crushing zone, it is subjected to a crushing action of a crushing wall and a rolled white wall. The crushing zone materials completely come from a crushing zone, and are crushed after crushing and rolling. Discharge completely into the next fragmentation zone. The trajectory of the whole material passing through the crushing cavity provides a method for the research on the crushing of the cone crusher. The circular arc trajectory corresponding to each movement cycle of the movable cone can be used as a layered boundary for the crushing cavity. In the stratified study shown, if the amount of material in the previous crushing layer is less than the amount of material in the next crushing layer, the next crushing layer will have a waiting phenomenon, if the amount of material in the previous crushing layer is lower than that in the next crushing layer. If the amount of material required is large, the crushing layer will clog up. In order to make the material in the crushing chamber flow smoothly, the productivity of the crusher can be increased as much as possible, and the maximum material throughput of each crush layer should be ensured as equal as possible, thereby reducing the clogging and the waiting phenomenon of each crushing layer of the crushing chamber.
Research on Curve Cavity Based on Fixed Mass Principle and Construction Angular Joining Angle 2.1 Principles and Application of Fixed Mass In order to improve the working performance of cone crusher, the principle of fixed mass was put forward and applied to the cavity shape design of cone crusher. The principle of fixed mass is based on stratified crushing. According to the operating parameters and structural parameters of crusher crusher, the crushing chamber is broken and stratified, and the principle that the equivalent throughput of each crushing layer must be equal.
Based on the principle of fixed mass, the crushing chamber is divided into layers. As shown, the throughput is obtained according to the principle of fixed mass; n is the rotational speed; pd is the precession angle; the length of the parallel zone; 4 is the design of the plugging layer; The crushing layer designs the angle of entrapment; s is the bottom angle of the moving cone; the filling degree of the plugging layer material; the filling degree of the material of the crushing layer. In order to ensure the chamber's working performance, effectively reduce the crushing chamber plugging and waiting for material phenomenon. As shown, the throughput of each crushing layer equivalent material is also equal to the product of the crushing layer area and the corresponding material filling degree, that is, the line AC arc CE, straight line EF, the corresponding area can be replaced by a trapezoidal ACFG, ie, to improve the crushing Cavity work performance.
2.2. Crushing cavity design based on energetically angled angles The Beijing Research Institute of Mining and Metallurgy first introduced angling angles into the design of the jaw crusher. 161. However, considering the internal angle of the cone crusher, the cavity design is at home. It has not been reported outside. In this paper, the working angle is introduced into the cavity design of the cone crusher so as to realize lamination crushing, effectively improve the work performance of the crusher, and improve the quality of broken products.
2.2.1 Cone Crusher in the working state Angular conical crusher cavity design is generally just to ensure that the size of the crushing cavity to meet the requirements of the discharge port, crushing cavity design angle can effectively bite the material, cavity design does not have a corresponding Theory as a design guideline. However, due to the movement law of the broken mobile cone around the suspension point, the angle of engagement of the crusher tends to be larger than the angle of the cavity design, thus affecting the work performance of the crusher and the quality of the broken product. As shown in (a), the design angle of the force point A of the conical crushing cone is 24°, and the angle of the working angle of the crusher reaches 32° is close to or exceeds the angle of friction between the bulk material and the crusher liner. At twice the bulk material cannot be effectively bitten at work. 2.2.2 Application of Angular Engagement in the Design of Cavity In order to improve the working performance of the crushing chamber, this paper improves the design of the cone crusher cavity based on the angulation angle of the crusher. As shown in b, the design angulation of the point A in the crushing cavity Improvement of the design of the 24° before the pre-work angle of engagement is 32°. The improved design of the A-point configuration of the angle of engagement of 28° effectively reduces the angulation of the crushing chamber at point A. In addition, by optimizing and improving the design of the rolling wall curve, it can be ensured that the angulation angle at point A in b is its design angle of 24° to improve the workability of the crusher and improve the quality of broken products.
The crushing chamber of the cone crusher was delaminated on the basis of the movement characteristics of the bulk material and the angle of entrapment. As shown in the figure, the crushing chamber of the cone crusher was divided into several crushing layers, and the 0th layer (plugging layer) was taken as the research object. The 0th crushing layer consists of an arc segment AD, a straight line segment DG, an arc segment GF, a straight line segment FE, an arc segment EB, and a straight line segment BA. Take the midpoint H of the straight-line segment BA as the stress point, analyze its working angle, HI direction is the pressure direction of the dynamic cone at the H point, 1A is the normal direction of the intersection I of the HI and the arc FG, define the HI direction and The angle p in the 1A direction is the angulation angle of the 0th crushing layer, and there is a friction angle between the material and the crusher liner.
In general, in the cone-shaped crusher chamber design, the angle of attack P is required to satisfy the relation shown in the formula (4). As shown, below the M point of the crushing chamber, the angling angle is required to satisfy the formula (4). However, at the M point above the crushing cavity, the angling angle can be relaxed (equation (4)). This is due to the crushing cavity above the point M, the crushing cavity is mainly used to smoothly introduce the material and form a dense material layer, so it can relax the requirements of the working cavity angle of the crushing cavity.
2.2.3 New Method for Cone Crusher Cavity Design Based on Fixed Mass Principle and Constructional Angular Entrapment Because the cavity design of the cone crusher must meet relevant design standards and requirements, the design of the crusher layers in the cone crusher cavity design cannot be severe. Meet the principle of fixed quality. In order to improve the crusher cavity work performance, it is necessary to reduce the difference between the design cavity shape and the ideal cavity shape satisfying the principle of fixed mass and the working angle. For this purpose, the standard deviation a of the standard deviation Td of the equivalent material throughput in each crushing layer of the crushing chamber and the difference in the working attitude angle of each adjacent crushing layer is proposed as the cavity design principle: the average value of the difference between the energizing angles of the layer structures; K The total number of broken layers.
In the cone-shaped crusher cavity design, the values of T and a should be reduced as much as possible in order to minimize the difference between the actual designed cavity shape and the ideal cavity shape that fully satisfies the fixed mass principle.
In summary, based on the lamination crushing, the principle of fixed mass, and the construction angle, a new method of cavity design is proposed as follows: 1 Based on the crusher operating parameters, structural parameters and kinematics of loose materials, the crushing cavity is layered Research; 2 based on the cone crusher chamber shape and crusher performance parameters and structural parameters related, so take these performance parameters and structural parameters as a design variable: stroke.