JPS6155425B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the operation of a cone crusher, in which at least the rotational speed of the crusher main shaft is changed and controlled to achieve the best required crushing state.

As is well known, with the trend of the times, the operation of cone crushers has increasingly relied on automatic control, and in fact, various control methods have been proposed.

However, at present, the operating conditions are automatically checked for crusher power (motor current), crusher load (hydraulic pressure supporting the crusher main shaft), and even the exit gap of the crushing chamber, and comparative control is performed based on these actual measurements. It is customary to automatically control the crusher to the best condition for effective crushing according to the set value.

In this case, in actual control, if the exit gap of the crushing chamber is used as the only element, it is usually effective and there is no problem, but if the supply amount fluctuates widely, it may be necessary to simply control the outlet gap. In this case, it is virtually impossible to fill the appropriate amount of raw material into the crushing chamber and keep the current consumption or oil pressure within the set range.As a countermeasure, the well-known surge pile (bin) or supply volume It is essential to provide a control feeder and a conveyor for supplying raw materials to the crusher. This causes disadvantages in terms of plant production costs and effective use of equipment space, and especially when installing multiple stages of crushers in the upstream and downstream, surge piles and other supply control equipment are required for each stage. Not only does the above problem become even more serious, but even when actually controlling it, it is necessary to perform upstream control while considering downstream crusher capacity, surge pile capacity, etc., making plant control difficult overall. Control itself was also difficult.

Another problem with controlling the outlet gap is that the smaller the gap, the finer the product will be, but since the overall amount of passing through is reduced by controlling the gap, even if the product production is Even if efficiency was increased, the absolute production volume of the product did not increase, and therefore mass production could not be achieved by controlling the gap alone. In particular, when the gap is made smaller, the pressure, that is, the hydraulic pressure of the crusher spindle and the motor current, will fluctuate widely. Therefore, this phenomenon hinders the efficient production of products, and the resulting overload reduces the durability of the crusher. This resulted in the loss of the results.

This invention was created in view of the above problem, and its purpose is to always control the crusher to a desired optimum state by using at least the rotation speed of the crusher main shaft as a control element. The control eliminates the need for surge piles and other supply control means, thereby reducing plant costs and further reducing equipment space, while also allowing product production while keeping the amount of raw material passing constant. The object of the present invention is to provide a crusher control method that also improves efficiency.
Therefore, the feature is that in the operation control method of a cone crusher, one or more of the crusher load, product particle size, and product production efficiency are detected continuously or periodically during the crushing operation. The object of the present invention is to perform control to change the rotational speed of the main shaft of the co-crusher to a minimum in order to maintain a crushing state in which the detected value is within a preset required range.

The method of the present invention will be explained below with reference to an illustrated example.

FIG. 1 is a flowchart of a crushing plant for carrying out the method of the present invention, in which 1 indicates an upstream plant, and crushed stone from the plant 1 is passed through a first classifier 2 as shown by arrow a on the chart. Show b
It is divided into two directions: the product 3 direction shown by arrow c and the crusher 4 input direction shown by arrow c.

The crusher 4 is of the well-known cone type shown in FIG. 2, and its outline will be described here. 5 is a crusher frame, and the frame 5 has a charging hopper 6 at its top, and a cone-shaped crusher at the bottom. The cone cape 7 has an open bottom and a fixed receiver 8 is integrally formed in the center thereof. Reference numeral 9 denotes a bevel gear rotatable within the receiving cylinder 8, and the gear 9 is concentric with the crusher center O, and is connected to the motor 10 in FIG.
Drive pinion 11 rotated around the horizontal axis by
However, it is actively rotated. Above bevel gear 9
In this case, the eccentric cylinder 12 is erected to rotate concentrically within the fixed receiver cylinder 8, and by making its inner periphery eccentric, the center O' of the crusher main shaft 13, which is supported in a surrounding manner inside the cylinder, is kept constant. Upper fixed bearing 14 even with eccentricity
Rotate downwards around the center. The main shaft 13 is rotated by a thrust bearing 15, and is also supported from below by a hydraulic device 16 so as to be able to rise and fall. Reference numeral 17 denotes a mantle fitted around the middle outer periphery of the main shaft 13. The mantle 17 is rotatable within the cone cape 7, and an outlet gap 19 is provided at the lower end of the compression crushing chamber 18 formed between both 7 and 17. It has been formed. This gap 19 is variable as the rotation occurs, and the gap when they are closest is called CSS...mm as the normal gap, and its value can be freely varied by raising and lowering the hydraulic device 16. can be done.

In such a crusher 4, when the raw material is input as shown by the arrow c, it is crushed inside and outside the crushing chamber 18 to form a consolidation layer, and the crushed stone is taken out as shown by the arrow f in FIG. Those that have already been passed through the classifier 20 and have a size of 5 mm or less are taken out as product 3 as shown by the arrow g, and those that are larger than that are refluxed as shown by the arrow h and are recycled together with new feedstock C in an appropriate ratio. Mixed and reintroduced.

The operation of the cone crusher constructed in this way is controlled, and the detection elements in this case include the crusher load, product particle size, and product production efficiency.

The crusher load mentioned above is mainly caused by the hydraulic system 1.
Continuously or periodically detected as an oil pressure value of 6,
The rotation speed of the crusher main shaft 13 is changed and controlled in order to maintain the best crushing condition in which the detected value is within a required range set in advance. In this case, it is possible to control the outlet gap 19 by the hydraulic device 16, and it is also possible to control the supply amount.In this way, the crusher load can be controlled by adjusting the outlet gap, the supply amount, and the rotation speed. By selectively controlling the three, the best crushing state can be achieved.

In other words, the graph shown in Fig. 3 shows how to vary the crusher load to the best condition by controlling the swing speed, with the horizontal axis representing the rotational speed of the main shaft and the vertical axis representing the main shaft oil pressure (Kg/cm ² ). This shows that it is possible to do this, and also that it is possible by controlling the gap.

Regarding the product particle size listed above, if the detected value is not within the required range set in advance, two of the three control elements of the outlet gap, feed rate, and rotation speed are adjusted. Combination control leads to the best particle size.

Furthermore, if the detected value is not satisfied with respect to product production efficiency, the ratio of (product production amount/passage amount) is set by controlling all three control elements of gap, supply amount, and rotation speed in combination. control within the required range. In other words, Figure 4 shows how the product ratio is controlled by the rotation speed, which is one of the control elements. In this case, when the gap is constant and the spindle rotation speed is changed, the throughput is Although it remains approximately constant, the product production volume increases and decreases, and the product production efficiency tends to increase as the rotational speed increases. Also, by controlling the gap, the production efficiency can be changed in the same way, and by combining these with supply amount control, the production efficiency is controlled within the initially set range.

In reality, crusher load, product granularity,
In order to continuously or periodically detect any one or more of the production efficiency of the product as a detection element, and maintain the crushing state such that these detected values are within the required range set in advance. Control is performed to at least change the rotation speed of the crusher spindle.

The method of this invention is as described above, and since the turning speed of the crusher main shaft is used as a control element as a crusher operation control method, the control ability can be used to freely control the crushing state to the best possible state for any request. It has become possible to do this. Along with this, there is no need for special control equipment such as surge piles and feeders for cutting surge piles, and the plant is therefore very advantageous in terms of cost and space, especially when the upstream and downstream plants are configured as in the above example. It is valid for those who do.
Furthermore, controlling the rotational speed has the secondary effect that the increase in the rotational speed makes it easier to make the grains finer, thereby increasing the product production amount.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the cone crusher and its operating state in the method of this invention, Fig. 2 is a vertical cross-sectional view of the crusher showing the controlled object, and Fig. 3 is data showing the relationship between speed control of the crusher main shaft and crusher load. The graph shown in FIG. 4 is a data graph showing the relationship between spindle speed control and product production efficiency.

Claims (1)

[Claims] 1. In a cone crusher operation control method,
During crushing operation, one or more of crusher load, product particle size, and product production efficiency are detected continuously or periodically as detection elements, and the detected values are within a required range set in advance. 1. A method for controlling the operation of a cone crusher, characterized by controlling the rotation speed of a main shaft of a co-crusher to a minimum in order to maintain a crushing state such as that in a cone crusher.