JPH06102161B2 - How to operate the solid crusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to the operation of a solid crusher for crushing slag such as blast furnace slag and converter slag, and raw materials such as cement clinker, cement raw material, and coal. In particular, the present invention relates to a method for operating a rigid crusher capable of improving crushing efficiency and maintaining product quality by individually controlling and adjusting the crushing pressure of crushing rollers.

[Prior Art] As is well known in the art, a hard crusher 1 of this type is mounted on a vertical output shaft of a speed reducer 2 below a casing 15 as shown in FIG. 7, and is driven to rotate by an electric motor 2A. The rotary table 3A is provided with a plurality of crushing rollers 4 rotatably arranged on the rotary table 3A at predetermined angular intervals in the circumferential direction. The crushing roller 4 has an arm 5 pivotally supported by a shaft 6 on a casing 1.
And piston rod 10 of hydraulic cylinder 9 via arm 7
By operating the hydraulic cylinder 9, the crushing roller 4 is pressed onto the rotary table 3A to apply crushing pressure to the raw material. 3B is a dam ring provided on the outer peripheral edge of the rotary table 3A for adjusting the raw material layer pressure, 14 is a gas supply passage for gas ejected from the periphery of the rotary table 3A, and 13 is a rotary separator for classifying the raw material crushed by the blades 13A. 15B is a raw material charging chute.

As shown in detail in FIG. 8, the hard crusher configured as described above has, for example, four crushing rollers 4A to 4D on the rotary table 3A at equal angular intervals. Hydraulic cylinder 9A connected to rollers 4A-4D
In the 9D, hydraulic pressure is applied to the rod end chambers via the respective pressure lines 17 by one hydraulic adjusting device of one hydraulic device 16, and the same crushing roller is applied to all the crushing rollers 4A to 4D. Pulverization is performed by applying pressure (pressing force). Incidentally, 17 is a hydraulic pressure supply line to the rod end side of the hydraulic cylinders 9A to 9D, and 19 is an accumulator connected to the pressure line 17.

[Problems to be Solved by the Invention] By the way, in such a solid pulverizer for pulverizing a raw material between a rotary table and a pulverizing roller, a plurality of raw material particles are moved by a movement (behavior) on the rotary table. The amount of raw material biting into each crushing roller and the size of the biting particles may be different, and the load on each crushing roller may be different. It is also affected by the nature of. In such a case, if all the crushing rollers are crushed with the same crushing pressure as described above, it tends to be over-crushed, or it becomes difficult to obtain a product with a stable precision configuration, and more power is consumed than necessary, It has also been found that it causes vibration of the crusher and hinders stable operation. In particular, in the case of slag crushing or cement finishing crushing, since it becomes the final product, it is necessary to stabilize the particle size composition of the crushed product.

Incidentally, as a method of preventing over-milling and reducing power consumption in this manner, the applicant previously filed Japanese Patent Application Laid-Open No. 59-147649.
There is a method disclosed in Japanese Laid-Open Patent Publication No. 1994-163, which is divided into two pairs of pulverizing rollers, for example, two pulverizing rollers in symmetrical positions among four pulverizing rollers as one pair. Since each crushing roller pair is provided with a separate hydraulic control device to control the crushing pressure for each crushing roller pair, the crushing pressure of a pair of crushing rollers, that is, two crushing rollers at opposite positions is Only the same pressure can be controlled, and as described above, it is not possible to deal with the different crushing load states of a plurality of crushing rollers, for example, four crushing rollers. There was a problem that it was not possible to stabilize the operation and stable operation with low vibration.

The present invention has been made in view of the problems of such a conventional operating method, and even when the crushing load of each crushing roller is different, a predetermined crushing pressure suitable for each crushing roller load is applied. The purpose of the present invention is to provide a method for operating a rigid crusher, in which a product of good quality can be obtained by feeding and stable operation can be performed.

[Means for Solving the Problems] In order to achieve the above object, the present invention is configured to individually control the crushing pressure of each crushing roller of a plurality of crushing rollers, and to reduce the crushing load of each crushing roller. Accordingly, the crushing pressure of the crushing roller is individually controlled.

In addition, the actual value of the crushing pressure of each crushing roller is detected during operation, and the setting of the crushing pressure of each crushing roller is adjusted based on the detected value. The crushing pressure of the crushing roller at the position is maximized, and the crushing pressure of the crushing roller positioned on the table rotation direction side of the crushing roller is set to be gradually lower.

[Operation] In the present invention, the crushing pressure of the crushing rollers is individually controlled according to the crushing load of each of the plurality of crushing rollers.
The crushing work of each crushing roller is shared and the crushing state is balanced, excessive crushing does not occur, the product particle size composition is stable, and the entrapment of raw material into the crushing roller and crushing pressure Abnormal vibration of the crusher due to balance does not occur and stable operation is performed.

In addition, if the actual crushing pressure of each crushing roller is detected and the load state of that crushing roller is confirmed, and the crushing pressure of each crushing roller is corrected according to the actual load to operate, It is possible to operate at an optimum pressure in response to a change in the load of the crushing roller due to a change in the properties of the raw material charged to, and a more stable operation is performed.

Further, for example, in consideration of the flow state of the raw material according to the raw material feeding position, the pulverizing roller at the position where the raw material is most easily bittened to maximize the pulverizing work to increase the pulverizing work, and the pulverizing roller sequentially on the table rotation side. By lowering the crushing pressure of 1, the work load of each crushing roller is evenly distributed, and more stable operation is performed.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First
1 and 2 show an embodiment of an apparatus to which the method of the present invention is applied. FIG. 1 is a model diagram showing a crushing roller arrangement and a hydraulic line, and FIG. 2 is a hydraulic control unit and a hydraulic pump unit. It is a connection diagram of a hydraulic cylinder. In addition,
In the figure, those parts which are the same as those corresponding parts in FIGS. 6 and 7 are designated by the same reference numerals, and a description thereof will be omitted.

As shown in FIG. 1, four crushing rollers 4A to 4D are arranged on the rotary table 3A at equal angular intervals in the circumferential direction. Hydraulic control units 50A to 50D are independently and individually connected to the hydraulic cylinders 9A to 9D of the crushing rollers 4A to 4D, respectively, and connected by pipes 51A and 52A. Also,
The hydraulic pressure control units 50A to 50D are configured so that hydraulic pressure is distributed and supplied from one hydraulic pump unit 53 through pipes 51B and 52B.

FIG. 2 shows the circuit details of the hydraulic control units 50A to 50D.
Since the hydraulic control units have exactly the same configuration, only the circuit of the hydraulic control unit for one crushing roller is shown here.

Reference numeral 54 is an electromagnetic switching valve, and a pump side and a tank side of the electromagnetic switching valve 54 are a pipe 51B connected to a discharge pipe 53B of a pump 53A of a hydraulic pump unit 53, and a return pipe 53D to a tank 53C. The connected pipe 52B is connected, and further, one side of this electromagnetic switching valve 54 is connected to the pipe 51A via the pipe 61, and the pipe 51A is connected to the oil supply port 9X of the rod end side chamber of the hydraulic cylinder 9A, Pipe 52 through pipe 62
A is connected, and this pipe 52A is connected to the oil supply port 9Y of the head end side chamber of the hydraulic cylinder 9A. Solenoid switching valve 54
When SOL1 is excited, the oil sent from the pump 53A is supplied to the rod end side chamber of the hydraulic cylinder 9A from the oil supply port 9X through the pipes 53B and 51B, the electromagnetic switching valve 54 and the pipes 61 and 51A, and the grinding roller 4A is pressurized. The crushing pressure is applied. 19 is an accumulator connected to the pipe 51A for keeping the crushing pressure constant, 55 is a check valve, 58 is a pressure regulating valve attached to the pipe 61a branched from the pipe 61 via the pilot check valve 57. The crushing pressure of the crushing roller 4A is adjusted (set) by the pressure adjusting valve 58. The pressure adjusting valve 58 can be automatically controlled by setting it as an electromagnetic valve. In addition, 59
Is an electromagnetic switching valve for operating the pilot check valve 57,
The pilot check valve 57 is opened by exciting SOL5 to adjust (set) the hydraulic pressure of the pressure adjusting valve 58.

On the other hand, when SOL2 of the electromagnetic switching valve 54 is excited, the oil supply of the pump 53A is supplied to the rod end chamber of the hydraulic cylinder 9A from the oil filler port 9Y through the piping 53B and 51B, the electromagnetic switching valve 54 and the piping 62 and 52A. The crushing roller 4A is raised. 60 is piping 62
The check valve 60 is a pilot check valve mounted on a pipe 62a branched from the check valve 60. The check valve 60 is opened and closed by operating SOL3 and SOL4 of the electromagnetic switching valve 61.

During the crushing operation, SOL3 of the electromagnetic switching valve 61 is excited to the state shown in the figure, and the pilot check valve 60 is opened by the pilot pressure from the piping 61 of the crushing pressure line to open the head end side chamber of the hydraulic cylinder 9A to the tank 53C. Open to. Then, by closing the pilot check valve 57 with the electromagnetic switching valve 59 in the illustrated state, a constant crushing pressure is maintained inside the rod end chambers of the pipes 61, 51A, accumulator 19 and hydraulic cylinder 9A.

When the grinding roller 4A is raised, such as when work is stopped, the solenoid SOL 4 of the solenoid switching valve 61 is excited to activate the pilot check valve 60.
To block. 56 is a flow control valve in the pipe 62.

Therefore, in this embodiment, the crushing pressures of the four crushing rollers 4A to 4D are individually controlled, and the crushing pressure is controlled according to the crushing load of each crushing roller. Now, as shown in FIG. 3, when the raw material feeding chute 15B is obliquely attached and the raw material is supplied onto the rotary table 3A, the flow state of the input raw material on the rotary table 3A tends to occur. As shown in Figure. That is, the crushing roller 9A at the position where the charged raw material is most easily bittened has the highest amount of raw material to be crushed (that is, the load), and the crushing roller 9A that is sequentially positioned in the rotation direction of the rotary table 3A is more crushed than the crushing roller 9A. roller
The loads of 9B, 9C and 9D are gradually decreasing. This means that some of the crushed particles that were first bitten by the crushing roller 9A and then crushed by the rotary table 3A before reaching the next crushing roller 9B.
The air blown up from the outer periphery through the gas supply passage 14 is carried to the upper part and collected as a product, so that the amount of bite into the crushing roller 9B is smaller than the amount of bite into the crushing roller 9A, and similarly. The amount of biting into the crushing rollers 9C and 9D is gradually reduced, and the raw material is crushed from the crushing roller 9A to the rotation direction side of the rotary table 3A.
This is because the product is gradually bitten into 9D and repeatedly pulverized to gradually become a final product with a fine particle size. That is, as also shown in FIG. 4, since the amount of the raw material caught in each of the pulverizing rollers 9A to 9D is gradually decreased and the size of the raw material particles to be caught is gradually reduced, the crushing rollers are bitten into the crushing rollers. The material layer pressures H4A to H4D to be introduced and the contact areas S4A to S4D of the material with the crushing roller are gradually decreasing.

Therefore, all the crushing rollers 9A to 9D have the same pressure,
Alternatively, in the conventional method in which the pressures of the opposing crushing rollers are the same, the crushing state of the individual crushing rollers is unbalanced, resulting in excessive crushing and unstable particle size composition, or higher than necessary. Abnormal vibrations were generated due to the crushing pressure.

Therefore, according to the present invention, in such a case, the crushing pressure of the crushing roller 9A, which has the highest crushing load, is set to the highest as indicated by the circle in FIG. The crushing pressures of the crushing rollers 9B to 9D are sequentially lowered to be lower than that pressure, and the crushing pressures corresponding to the loads are applied to the individual crushing rollers to enable balanced crushing.

When setting the pressure of the crushing rollers as described above, the actual load state of each crushing roller 4A to 4D is confirmed by the pressure gauge 63 in FIG. 2 during operation, and each crushing roller is checked according to the actual load. If the crushing pressure of the rollers 4A to 4D is corrected, more reliable crushing operation can be performed. That is, if the indication value of the needle of the pressure gauge 63 is high, or if the movement (fluctuation width) is frequent, the crushing roller has a large amount of crushing work and the needle indication value is low, or if the movement is slow. Since the amount of crushing work is small, by adjusting the crushing pressure to the optimum crushing pressure according to the load, for example, changes in the properties such as the water content and particle size of the raw material that are actually fed, and the raw material feeding chute Grinding each due to changes in the actual flow state of the raw material particles on the rotary table 3A due to various factors such as differences in the mounting form, fluctuations in the amount of gas blown up from the gas supply passage 14, or the height of the dam ring 3B. If the crushing pressure of each crushing roller is corrected and set according to the load fluctuation of the roller, it can be made more reliable. When the raw material water content increases, the frictional resistance between the raw material particles and the rotary table 3A on the rotary table 3A increases, and the particles are more easily influenced by the rotation of the rotary table 3A. Tends to rotate around the table, the amount of flying to the outer peripheral side of the table decreases, the amount of biting into the crushing roller increases, and the crushing load tends to increase. This is the same tendency as the frictional resistance with the rotary table 3A increases even when the particle size of the raw material increases. Therefore, the crushing pressure corresponding to the change of the load of each crushing roller according to the property of the raw material is applied.

Further, in the present invention, since the crushing pressure of each crushing roller can be adjusted individually, it is possible to easily cope with the case where the crushing load of the crusher is changed as shown by the mark in FIG. For example, when dropping from high load to medium load, the grinding roller 9
The crushing pressures of A, 9B and 9C can be set to medium pressure, medium low pressure and low pressure, respectively, and the crushing pressure of the crushing roller 9D can be depressurized to a crushing pressure suitable for each crushing roller load.

In the present invention, the raw material feeding method is adopted in which the raw material is fed onto the rotary table 3A from directly above the center of the rotary table 3A so that the amount of biting into each crushing roller can be made substantially even. In such a case, the loads on the respective crushing rollers become substantially equal, but even in such a case, the crushing pressures of all the crushing rollers can be made substantially equal. In addition, of course, according to changes in the raw material biting load and the crushing load of the crusher, for example, the crushing pressures of the two crushing rollers 9A and 9C facing each other are set to the same predetermined crushing pressure according to the load, and the other facing Done 2
The crushing pressures of the individual crushing rollers 9B and 9D can be easily changed to the same crushing pressure of different loads or depressurized.

As described above, by individually adjusting the crushing pressure of the crushing roller, the particle size composition of the product can be easily adjusted as shown in FIG. 6, and the product particle size composition can be stabilized. Curves a, b, and c in FIG. 6 show the particle size composition when the crushing pressure is set to high pressure, medium pressure, and low pressure, respectively.

In the above description, the case where the number of crushing rollers is four has been described, but of course, the crushing machine having two, three or more crushing rollers can be applied.

[Effects of the Invention] As is clear from the above description, the crushing loads of a plurality of crushing rollers are shared and balanced, so that excessive crushing is prevented, the product particle size configuration is stabilized, and the crushing rollers are Abnormal vibration of the crusher due to unbalance of the raw material biting into the crusher and crushing pressure does not occur, stable operation can be performed, and power consumption more than necessary can be suppressed. Of course, the number of crushing rollers to be operated can be arbitrarily selected according to the change of the crushing load due to the change of the amount of bite of the raw material of each crushing roller based on the change of the crushing amount of the crusher or the change of the property of the raw material. Alternatively, the crushing pressure of each crushing roller can be set to an arbitrary value, and the adjustment for maintaining the particle size structure and stable operation can be easily performed.

In addition, if the crushing pressure of each crushing roller is detected and the load state of the crushing roller is confirmed, and the crushing pressure of each crushing roller is corrected according to the actual load to operate, It is possible to operate at an optimum pressure in response to load fluctuations of the crushing roller due to changes in the properties of the raw material charged into the container, and more stable crushing can be performed.

Further, for example, when the flow state of the raw material according to the raw material feeding position is taken into consideration, the crushing pressure of the crushing roller at the position where the raw material is most easily bitten is maximized to increase the crushing work, and the crushing work is sequentially performed on the table rotation side. By lowering the crushing pressure of a certain crushing roller, the work load of each crushing roller is evenly distributed, and more stable crushing can be performed.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention. FIG. 1 is a model diagram showing the arrangement of a crushing roller and a hydraulic line, and FIG. 2 is a hydraulic control unit, a hydraulic pump unit and a hydraulic cylinder. Connection diagram, FIG. 3 is a diagram for explaining the behavior state of the raw material on the rotary table when the rotary table is viewed from above, FIG. 4 is a diagram showing changes in the raw material biting state of each crushing roller, FIG. Is a diagram showing an example of setting the crushing pressure of each crushing roller, FIG. 6 is a graph showing changes in the particle size composition when the crushing pressure is changed, and FIG. 7 is a vertical cross-sectional view showing the overall structure of the rigid crusher. , FIG. 8 is a diagram showing a conventional hydraulic line. 1 ... Hard crusher, 3A ... Rotary table, 4A-4D ... Grinding roller, 5,7 ... Arm, 9A-9D ... Hydraulic cylinder, 10 ... Piston rod, 15B ... Raw material chute, 16,50A-50D …… hydraulic control unit, 53 …… hydraulic pump unit.

Claims (3)

[Claims] 1. A crushing roller having a plurality of crushing rollers arranged at predetermined intervals in the circumferential direction on a rotary table, applying crushing pressure to the crushing rollers and pressing the crushing roller to crush the raw material with the rotary table. In the operating method of the die crusher, the crushing pressure of each crushing roller is individually controlled, and the crushing pressure of the crushing roller is individually controlled according to the crushing load of each crushing roller. How to operate the solid crusher. 2. The actual value of the crushing pressure of each crushing roller is detected during operation, and the setting of the crushing pressure of each crushing roller is corrected based on the detected value. The operating method of the described solid crusher. 3. The crushing pressure of the crushing roller located at the position where the charged raw material is most easily bitten is maximized, and the crushing pressure of the crushing roller located downstream of the crushing roller in the table rotation direction is set to be gradually lower. The method for operating the rigid crusher according to claim 1 or 2, characterized in that.