JPH05285404A - Method for operating jaw crusher in high performance - Google Patents

Abstract

PURPOSE: To enhance the treating capacity without increasing a crushing power by operating a normal ore crushing device such as a jaw crusher or a conical crusher with charging quantity more than a decided level and at a lower speed than a decided level at a time of using the apparatus. CONSTITUTION: The conical crusher 70 is provided with a cone type head 72 for revolving around the periphery of a vertical shaft 74 with an eccentric body 76 fundamentally operated with a driving system 78, and a feed member 80 is crushed between the revolving head 72 and a stationary bowl 82. This crusher has a determined speed, a determined charging quantity and a determined max. crushing power, and a determined power for attaining the whole performance as the result. In such the conical crusher 70, the charging quantity is increased more than the determined level and the speed is lowered lower than the determined level, thus the performance is enhanced without increasing the crushing power.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method of operating an ore crushing device for maximum performance, and more particularly to a method of operating a crusher such as a jaw crusher.

[0002]

2. Description of the Related Art Conventional commercially available ore crushers such as jaw crushers and conical crushers set numerical values for operating parameters and performance characteristics such as stroke (head throw), eccentric speed, horsepower, overall performance and crushing power. Is correlated with. The crusher stroke can be defined as the maximum and minimum displacement distance of the head (jaw) in the eccentric rotation cycle. Eccentricity is self-explanatory. Horsepower is the amount of energy consumed, which is a function of stroke, crushing force and eccentric velocity. Overall performance is expressed in ton / hour and crushing force is generally expressed as horsepower divided by the product of stroke and eccentric velocity. A traditional problem in operating this type of device is adjusting various parameters to obtain maximum capacity while keeping the crushing force below the maximum design performance of the machine. In particular, the jaw crusher aims to increase the processing capacity by increasing the horsepower without increasing the crushing force. As the crushing force increases, the crusher frame inevitably has to be strengthened to accommodate the increasing crushing load associated with the increased horsepower. The usual crushing theory states that the crushing power increases as the horsepower increases.

[0003]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a jaw crusher adjustment method for increasing performance without increasing crushing force, and yet another object is to provide optimum overall performance. To provide a method of adjusting the jaw crusher so that the optimum combination of horsepower, stroke and speed is obtained. That is, the present invention provides a method for adjusting a crusher, preferably a jaw crusher, which can increase the input amount (slow) while maintaining or decreasing the speed. It has been discovered that this adjustment can increase the throughput of the crusher without increasing the crushing force beyond the design limits of the device. The invention further relates to a method of operating a crusher having a defined horsepower and a resulting overall performance to achieve a defined speed, a defined dosage and a crushing force, In the method of the present invention, the performance of the crusher is improved without increasing the crushing force by making the amount of the input more than the predetermined level and the speed less than the predetermined level.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a defined speed, a defined dosage, a defined maximum crushing force and a defined horsepower to obtain the resulting overall crusher performance. It is an object of the present invention to provide a method of improving the performance without increasing the crushing force by increasing the input amount above a specified level and decreasing the speed below the specified level when operating a crusher. . The present invention also includes a housing for performing a crushing cycle with movable jaws having a crushing surface to operate at a fixed speed, a fixed stroke determined by a eccentric body of a fixed shape, and a fixed crushing force. A jaw crusher that is designed to provide a jaw crusher in which the overall performance is improved without increasing the crushing force by an eccentric body having a speed equal to or lower than a predetermined speed and an increased stroke above the predetermined stroke. Is.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. A jaw crusher is generally indicated at 10 in FIG. The jaw crusher 10 is a single toggle type, but may be a double toggle type, another type of jaw crusher, or a different type of crusher as described below. The crusher 10 has a basically rectangular frame 12, inside which a toggle block 14 and an adjusting wedge member 16 are mounted. The toggle 18 is supported by the toggle block 14 and a lateral groove 20 located at the lower end 22 of the movable jaw 24. The upper end 26 of the jaw 24 is provided with a lateral tubular sleeve 28 which receives and rotatably supports a rotary eccentric shaft 30. The shaft 30 has one end connected to a flywheel 32 and the other end connected to a known drive mechanism such as a belt or a pulley. A removable jaw plate or jaw die 34 is attached to the movable jaw 24, preferably the surface of which is an irregular surface having vertical grooves 36 for facilitating capture of the feed material. Fixed jaw 38 is positioned on frame 12 opposite the movable jaw and has a removable jaw plate or die 40 attached thereto. As with die 34, die 40 includes a plurality of vertical grooves 4
It is desirable to have 2. The jaws 24 and 38 are opposed to each other to form a generally V-shaped crushing space 43. A pull rod 44 is fixed to the lower end 22 of the jaw 24 and passes through the through hole 46 of the frame 12. The cover 48 is fixed to the pull rod 44, and the coil spring 50
Is fixed on the rod and the spring is held against the through hole 46. During operation, the rotation of the eccentric shaft 30 causes the movable jaw 2 to rotate.
4 causes the well-known elliptic rotation. The movement of the lower end 22 of the movable jaw 24 is adjusted by the action of the toggle 18 and the pull rod 44 by the spring. The feed material introduced into the upper end of the crushing space 43 gradually advances into a narrow gap by repeating the pressing stroke of the movable jaw 24 with respect to the fixed jaw 38. Toggle 18 is Joe 2
4 supports the lower end 22 of the spring 4 and pulls the spring 4
4 facilitates the return of the reciprocating movement of the lower jaw 22 to the basic position shown in FIG. In the basic position, Joe Dice 3
The lower ends of 4, 40 are in the closest position and form the narrowest passage space 52 for the crushed feed material.
Generally, in the jaw crusher design, the maximum capacity is defined as follows.

[0006]

[Equation 1]

Where f is a constant, p is the bulk density of the product, w is the width of the crushing chamber in inches, a is the trapping angle factor, r is the Giesking factor, 1 is the stroke, and N is the minute. The number of strokes per hit, that is, the speed.
In practice, increasing the width of the jaws increases the capacity of the crusher, which is heavy and costly. Therefore, apart from the width of the jaws, the only remaining variables in this equation are those that can change only stroke and stroke velocity. This equation also shows that changes in stroke and velocity have similar effects on fracturing performance. In general crusher design theory, it is further defined as follows.

[0008]

[Equation 2]

Therefore, it is known that the stroke speed is directly proportional to the crusher capacity and inversely proportional to the crushing force, so that it is possible to increase the capacity simply by increasing the speed and / or the charging amount. Similar to this performance formula, speed and stroke seem to have the same effect on the crushing force, but there is a sea speed due to ROSE et al.
It was found that speeds lower than that are proportional to performance, and higher speeds are inversely proportional to performance. From this, it can be said that speed is the most critical parameter in order to increase the performance without increasing the crushing force. However, studies by the present inventor have shown that the most important function in this connection is the dose, not the speed.

In FIG. 2, the relationship between the velocity% indicated by the X-axis 54 and the crushing force (toggle plate load) indicated by the Y-axis 56 is shown in a graph. Since the toggle plate 18 supports the lower end of the movable jaw 24 and receives the main load generated during the crushing process, the load of the toggle plate changes in proportion to the crushing force. The solid line 58 shows the input amount of 100%, that is, the specified input amount of the used device, and the dotted line 60 shows the case of the input amount of 150% of the specified input amount of the used device. Initial tests showed that if the horsepower, stroke, or speed were changed differently, each parameter had a critical value and beyond that, the crusher would start to work, but not optimal performance. . It has also been found that the performance of the jaw crusher decreases as horsepower, stroke and speed vary significantly from their critical values.

At the point A where the input amount is 100% and the speed is 100%, the strain of the crusher 10, that is, the crushing force, slightly exceeds 550 micro inches, but when the input amount is the same at the speed of 112%, the strain applied to the apparatus is the maximum point. Strain is slightly reduced after reaching B and beyond. At 140% speed, the strain value is still 525 microinches.

However, the line 60 increases the input amount to 150% of the specified amount of the machine, and if the speed remains the same, it is point C.
The machine strain at is shown to be substantially less than at point A to about 425 microinches. Therefore, it obviously has a more significant effect on the stress load of the crusher than the change in the input rate. By increasing the dosage and slowing down, the overall performance is increased, as indicated by point D, and the motor output used is achieved without having to change the crusher structure. Therefore, in order to increase the processing capacity while reducing the stress load of the apparatus, it is desirable to increase the input amount more than the decrease in speed. In practice, this is accomplished by replacing the jaw crusher 10 stroke with a standard diameter eccentric shaft by an improved diameter shaped shaft.

A conical crusher 70 is schematically shown in FIG. The crusher basically has a conical head 72 which rotates about a vertical axis 74 by an eccentric 76 which is actuated by a drive system 78. The supplied material 80 is crushed between the rotary head 72 and the fixed bowl 82. Similar to the jaw crusher, the conical crusher basically has the same processing capacity, crushing power, horsepower, speed and stroke (input amount). Further, in the conical crusher, the speed is changed by adjusting the eccentric drive system 78, and the input amount is adjusted by changing the shape of the eccentric body 76.

FIG. 4 is a graph showing the performance of the conical crusher. The velocity% shown on the X-axis 84 is compared to the crushing force shown on the Y-axis 86 in psi / 1000. Generally, by comparing FIGS. 2 and 4, the same principle applies to the jaw crusher and the conical crusher. In particular, by comparing the solid line showing the input amount of 100% and the dotted line showing the input amount of 150%, it was known that at a speed of 100%, the crushing force was reduced by about 50% due to the increase of the input amount of 150%. This is point E, which shows about 15,000 psi at 100% speed and 150% input amount.
It is known by comparing with the point F that shows about 7,000 psi in increase. Also, when comparing the effect of changing the input amount with the effect of changing the speed, the increase in speed shows the crushing force. It is clear that the effect on the crushing force, even if it results in a decrease in the load, is much less than an increase in the input.

Although specific examples of the high-performance operation method of the crusher of the present invention have been described above, it is obvious that various modifications and improvements can be made by those skilled in the art without departing from the scope of the present invention.

[0016]

According to the present invention, when an ordinary ore crushing device such as a jaw crusher or a conical crusher is used, it is possible to operate with an input amount above a specified level and a speed below a specified level. This makes it possible to improve the processing capacity without increasing the crushing power.

[0017]

[Brief description of drawings]

Fig. 1 Partially broken perspective view of the jaw crusher used in the present invention, Fig. 2 shows the relationship between the crushing force (toggle plate load) of the jaw crusher and the speed% when 100% and 150% of the specified amount is input. FIG. 3, a vertical cross-sectional view of the conical crusher used in the present invention, and FIG. 4 is a graph showing the relationship between the crushing force of the conical crusher and the speed% when 100% and 150% of the specified input amount is input.

[Explanation of symbols]

10 Jaw crusher 30 Eccentric shaft
78 Drive system 12 frame 70 Conical crusher 80 Supply material 18 Toggle 72 Conical head 24 Movable jaw 74 Vertical axis 38 Fixed type jaw 78 Eccentric body 43 Crushing space 82 Fixed type bowl

 ─────────────────────────────────────────────────── ——————————————————————————————————————————— Inventor Visia Kekala United States 53132 Wisconsin Franklin South Tumble Creek Drive 6713

Claims (5)

[Claims] 1. A crusher having a defined speed, a defined dosage and a defined maximum crushing power and a defined horsepower to achieve the resulting overall performance, the loading being above a defined level. An operating method characterized by improving performance without increasing crushing power by increasing the amount and reducing the speed below a predetermined level. 2. The method of claim 1 wherein the crusher is a jaw crusher. 3. The method of claim 1 wherein the increase% of input is greater than the decrease% of velocity. 4. The determined charging amount is determined by a specific eccentric shaft provided in the crusher, and the eccentric shaft has a specific eccentric shape, and is charged in place of the standard-equipped eccentric shaft. The method of claim 1 wherein an eccentric shaft with increased eccentricity is used to increase the amount. 5. A housing having a fracturing surface adapted to undergo a fracturing motion cycle with respect to an opposing stationary fracturing surface, having a fixed velocity, a fixed stroke determined by an eccentric of a particular shape, and a fixing. To improve overall performance in a jaw crusher designed to operate at a specified crushing force, by increasing the stroke above the determined stroke and decreasing the speed below the determined speed without increasing the crushing force. Characterized by having an eccentric body.