JP2022024581A - Vertical grinder mill - Google Patents

Abstract

To provide a vertical grinder mill comprising a tension device capable of optionally controlling a roller pressure.SOLUTION: A vertical grinder mill 10 comprises two crushing rollers 13 driven via a raw material on the top face of a rotary table 12, and a tension device 20 in which a cylinder rod moves telescopically to a cylinder case in a horizontal direction by linking the arm 15 end parts of the crushing rollers 13. The tension device 20 is characterized by: defining one structure as a spring structure 24 having a spring 23 energizing in a direction in which the first cylinder rod 21 contracts; defining the other structure as a hydraulic cylinder structure 28 having a second cylinder rod 26; serially connecting the spring structure 24 and the first and second cylinder case 22, 27 sides of the structure 28; and comprising a hydraulic control part 30 controlling the roller pressure of the crushing roller 13 by making the second cylinder rod 26 of the structure 28 contract.SELECTED DRAWING: Figure 1

Description

The present invention mainly grinds coal, oil coke, limestone, slag, clinker, cement raw material, other inorganic raw materials, or organic raw materials such as chemicals and biomass into powder with a plurality of crushing rollers driven on a rotary table. The present invention relates to a vertical crusher for crushing, and particularly to a vertical crusher in which a tensioning device is attached to a crushing roller.

A vertical crusher is widely used as a crusher for crushing raw materials such as blast furnace slag, cement, coal, and biomass. The conventional vertical crusher includes a rotary table and a plurality of crushing rollers arranged at positions that equally divide the outer peripheral portion of the upper surface of the rotary table in the casing forming the outer shell of the crusher. ..
In such a vertical crusher, when the crushing raw material is supplied to the center of the rotary table, the crushing raw material moves to the outer peripheral portion of the rotary table due to the rotation of the rotary table. Since the crushing roller is pressed and rotated at the outer peripheral portion, the crushing raw material penetrates between the crushing roller and the rotary table and is crushed. Then, the hot air blown up from the annular passage between the outer peripheral surface of the rotary table and the inner peripheral surface of the casing causes the powder or granular material to rise in the casing while being dried together with the hot air. The powder or granular material is sorted by the classification means provided in the upper part of the casing, and the product having a predetermined particle size is discharged to the outside. The coarse powder that cannot pass through the classification means falls on the rotary table again and is crushed.

Conventionally, the tensioning device of a small and medium-sized vertical crusher is attached to a casing so as to connect the swing levers of two crushing rollers (for example, disclosed in Patent Document 1). At this time, the rod is attached so that the expansion and contraction direction is horizontal. A vertical crusher having such a configuration is lifted upward if the layer thickness of the raw material to be bitten by one of the crushing rollers is too thick. Then, the other crushing roller is pressed against the rotary table side and the pressing force can be adjusted.
FIG. 4 is an explanatory diagram 1 of a conventional tensioning device. The conventional tensioning device has a structure in which a spring spring 1 is adopted inside. Spring The structure using the spring 1 is simple and inexpensive, but the roller pressing force cannot be changed during operation. Therefore, the roller pressurization cannot be remotely controlled. Further, there is a problem that the adjustment work of the roller pressing force is troublesome due to the manual work.

In recent years, there has been a need for reduction or labor saving of workers, production of various raw materials or products with one crusher, in other words, production of a wide variety of products, and remote control of roller pressurization has been realized with a conventional spring-type tensioning device. There is an increasing demand for remodeling to a hydraulic cylinder type that can be used. FIG. 5 is an explanatory diagram 2 of a conventional tensioning device. As shown in the figure, the tensioning device adopts the structure of the hydraulic cylinder 2. If it is a small crusher, even if the horizontally arranged spring is replaced with the hydraulic cylinder 2, it will operate without any problem. However, in the case of a medium-sized crusher, there may be a problem of oil leaking from the cylinder rod 3.
During crushing, vertical vibration is repeated in a short time due to the fine crushing motion of the crushing roller. When the hydraulic cylinder structure receives the roller reaction force, the axial force repeatedly acts on the hydraulic cylinder 2 and the seal portion 5 of the cylinder case 4 is repeatedly deformed, so that it is easily damaged.
Further, as the size of the crusher increases, the size of the hydraulic cylinder 2 also increases, and the cylinder rod 3 bends due to the increase in the weight and the length thereof, and a gap is generated between the cylinder rod 3 and the seal portion 5 of the cylinder case 4. Will cause an oil leak. Therefore, when the hydraulic cylinder type tensioning device is horizontally arranged, the size of the crusher is limited.

Japanese Unexamined Patent Publication No. 61-74654

An object to be solved by the present invention is to provide a vertical crusher provided with a tensioning device capable of arbitrarily adjusting a roller pressing force in view of the above-mentioned problems of the prior art. Another object of the present invention is to provide a vertical crusher to which a tensioning device using a hydraulic cylinder can be applied regardless of the size of the crusher.

In the present invention, as a first means for solving the above problems, two crushing rollers driven by a raw material on the upper surface of a rotary table and an arm end of the crushing roller are connected to each other from a cylinder case to a cylinder rod. In a vertical crusher equipped with a tensioning device that expands and contracts horizontally
The tension device has a spring spring structure having a spring spring for urging the first cylinder rod in a contracting direction, and a hydraulic cylinder structure having a second cylinder rod for the other, and the spring spring structure and the hydraulic pressure. The first and second cylinder case sides of the cylinder structure are connected in series,
It is an object of the present invention to provide a vertical crusher comprising a hydraulic control unit for controlling a roller pressing force of the crushing roller by reducing the second cylinder rod of the hydraulic cylinder structure.
According to the first means, the roller pressing force of the crushing roller can be easily adjusted by the hydraulic pressure control unit. Therefore, it can be easily controlled even by remote control. In addition, the crushing load of the hydraulic cylinder can be shared with the spring spring, reducing the load and reducing the wear of the seal portion. Furthermore, it can be applied to small and medium-sized vertical crushers.

The present invention is characterized in that, as a second means for solving the above problems, in the first means, the spring spring structure includes a spring reaction force adjusting portion capable of adjusting the reaction force of the spring spring. The purpose is to provide a vertical crusher.
According to the second means, even if the reaction force of the spring spring decreases due to aged deterioration, the desired reaction force of the spring spring can be easily set.

According to the present invention, the roller pressing force of the crushing roller can be easily adjusted by the hydraulic pressure control unit.

It is explanatory drawing of the tension device. It is explanatory drawing of the vertical type crusher of this invention. It is explanatory drawing of the spring reaction force adjustment part. It is explanatory drawing 1 of the conventional tensioning apparatus. FIG. 2 is an explanatory diagram 2 of a conventional tensioning device.

An embodiment of the vertical crusher of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is an explanatory diagram of the vertical crusher of the present invention. As shown in the figure, two (one set) crushing rollers 13 having outer peripheral surfaces facing each other are arranged on the upper surface of the rotary table 12 in the casing 11. The crushing roller 13 is rotatably supported by a roller shaft 14. The roller shaft 14 is fixed to the arm 15, and the arm 15 is swingably supported by a rotating shaft 16 outside the casing 11. Tensioning devices 20, which will be described later, are attached to the upper ends of the two arms 15 outside the casing 11 and connected to each other. In the vertical crusher 10 having such a configuration, the raw material supplied to the upper surface of the rotary table 12 moves in the outer peripheral direction by the centrifugal force of the table and is bitten into the gap between the crushing roller 13 and the rotary table 12. Be crushed.

[Tension device]
FIG. 1 is an explanatory diagram of the tensioning device of the present invention. As shown in the figure, the tensioning device 20 has a spring spring structure 24 having a spring spring 23 for urging the first cylinder rod 21 in a contracting direction, and a hydraulic cylinder structure 28 having a second cylinder rod 26 on the other side. The spring spring structure 24 and the first and second cylinder cases 22 and 27 sides (to each other) of the hydraulic cylinder structure 28 are connected in series. The first and second cylinder rods 21 and 26 expand and contract horizontally from the first and second cylinder cases 22 and 27, respectively.
The hydraulic pressure control unit 30 has an oil tank 32, a rod-side hydraulic circuit 34 connected to the rod-side oil chamber 27r of the second cylinder case 27, and a head-side hydraulic circuit 45 connected to the head-side oil chamber 27h. There is.
The rod-side hydraulic circuit 34 has a pressurizing circuit 35 connected to the rod-side oil chamber 27r and the oil tank 32, and a pressure relief circuit 36 branched from the pressurizing circuit 35 and connected to the oil tank 32.

The pressurizing circuit 35 has a pump 40, a pressurizing switching valve 41, and a check valve 42 from the oil tank 32 toward the rod side oil chamber 27r on the circuit.
The pressure relief circuit 36 is connected between the rod side oil chamber 27r and the check valve 42 and the oil tank 32, and has a pressure relief switching valve 43 on the circuit.
When increasing the pressing force of the crushing roller, the pressurizing switching valve 41 on the pressurizing circuit 35 is switched (the pressure release switching valve 43 is in the closed state), and the pump 40 pumps oil from the oil tank 32 to the rod side oil chamber 27r. By supplying the second cylinder rod 26, the second cylinder rod 26 is reduced and the crushing roller 13 is pressed against the upper surface of the rotary table to increase the pressing force of the crushing roller 13. On the other hand, when depressurizing the oil chamber 27r on the rod side, the depressurization switching valve 43 on the depressurization circuit 36 is switched (oil does not flow to the oil tank 32 via the pressurizing circuit 35 by the check valve 42). ), By discharging the oil from the oil chamber 27r on the rod side to the oil tank 32, the second cylinder rod 26 can be extended and the pressing force of the crushing roller 13 can be reduced.
The head-side hydraulic circuit 45 is connected to the head-side oil chamber 27h and the oil tank 32, and discharges oil from the oil chamber or supplies oil to the oil chamber as the second cylinder rod 26 expands or contracts. ..

In the tension device 20 having such a configuration, the first cylinder rod 21 has a spring spring structure 24, and the second cylinder rod 26 is connected in series as a hydraulic cylinder structure 28 to arrange the expansion / contraction direction in the horizontal direction. .. At this time, the roller pressing force required for the crushing roller 13 is shared by the spring spring structure 24 and the hydraulic cylinder structure 28. The share of the roller pressing force can be arbitrarily set as an example, such as a ratio of 50:50. The fine vertical movement of the crushing roller during crushing can be supported by the spring spring 23, and the large vibration can be received by the hydraulic cylinder. Therefore, the burden on the seal portion of the hydraulic cylinder structure 28 is reduced.
Further, in the case of the uniform ratio, the required roller pressing force related to the hydraulic cylinder structure 28 can be reduced to half as compared with the conventional structure.

Here, assuming that the load F (N) required for crushing, the cylinder pressure receiving area A (mm ² ), the hydraulic pressure P (MPa), the cylinder inner diameter D (mm), and the cylinder rod inner diameter d (mm), the load F required for crushing. (N) is proportional to the cylinder pressure receiving area A (mm ² ). That is, it can be expressed as F = P × A and further F = P × (π × (D2 − d ² ) / ⁴ ). If the load F required for crushing is halved, the cylinder pressure receiving area A can be halved, so that the cylinder rod diameter d can be increased even if the cylinder inner diameter D is the same. As a result of increasing the cylinder rod diameter d, the bending of the rod can be reduced and oil leakage can be prevented. Compared to a hydraulic cylinder, it is easier to follow minute repetitive movements, and the spring spring structure 24 can absorb the minute roller movements during crushing.
The hydraulic control unit 30 may apply remote control using a wired or wireless line to control pressurization or depressurization.

FIG. 3 is an explanatory diagram of the spring reaction force adjusting portion. As shown in the figure, the first cylinder rod 21a of the spring spring structure 24 is provided with a spring reaction force adjusting portion 50 on the tip end side of the rod. The spring reaction force adjusting unit 50 can adjust the length of the first cylinder rod 21a to an arbitrary length. As an example, the spring reaction force adjusting unit 50 adopts a turnbuckle structure in which a rod is divided into two parts and threaded, and a sleeve similarly threaded is provided. With such a spring reaction force adjusting unit 50, even if the spring reaction force decreases due to aged deterioration of the spring spring 23 of the spring spring structure 24 after the vertical crusher has been operated for a predetermined time, the rod of the first cylinder rod 21a The spring reaction force can be maintained (reset) by the spring reaction force adjusting unit 50 whose length can be arbitrarily changed.

According to the present invention as described above, it can be applied to a small and medium-sized vertical crusher for which a hydraulic cylinder structure could not be adopted. In addition, the hydraulic control unit that controls the roller pressurization can be remotely controlled.

The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.
Further, the present invention is not limited to the combinations shown in the embodiments, and can be implemented by various combinations.

1 Spring spring 2 Hydraulic cylinder 3 Cylinder rod 4 Cylinder case 5 Seal part 10 Vertical crusher 11 Casing 12 Rotating table 13 Crushing roller 14 Roller shaft 15 Arm 16 Rotating shaft 20 Tension device 21,21a First cylinder rod 22 First Cylinder case 23 Spring spring 24 Spring spring structure 26 Second cylinder rod 27 Second cylinder case 27h Head side oil chamber 27r Rod side oil chamber 28 Hydraulic cylinder structure 30 Hydraulic control unit 32 Oil tank 34 Rod side hydraulic circuit 35 Pressure circuit 36 Pressure release circuit 40 Pump 41 Pressurization switching valve 42 Backflow prevention valve 43 Pressure release switching valve 45 Head side hydraulic circuit 50 Spring reaction force adjustment unit

Claims (2)

In a vertical crusher equipped with two crushing rollers driven via raw materials on the upper surface of a rotary table and a tensioning device that connects the arm ends of the crushing rollers and expands and contracts the cylinder rod in the horizontal direction from the cylinder case.
The tension device has a spring spring structure having a spring spring for urging the first cylinder rod in a contracting direction, and a hydraulic cylinder structure having a second cylinder rod for the other, and the spring spring structure and the hydraulic pressure. The first and second cylinder case sides of the cylinder structure are connected in series,
A vertical crusher comprising a hydraulic control unit that controls the roller pressurization of the crushing roller by reducing the second cylinder rod of the hydraulic cylinder structure. In the vertical crusher according to claim 1,
The spring spring structure is a vertical crusher provided with a spring reaction force adjusting portion capable of adjusting the reaction force of the spring spring.

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