JP2617827B2 - Method and apparatus for repairing crushing roller of vertical crusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for repairing a crushing roller of a vertical crusher, and more particularly to an improved repairing method and apparatus for repairing a wear defect of a crushing roller by overlay welding.

[0002]

2. Description of the Related Art In order to finely pulverize limestone, slag, cement material and the like into powder, a vertical pulverizer having a rotary table and a pulverizing roller has been widely used.

This conventional crusher is provided with a disk-shaped rotary table that is driven to rotate about a vertical axis below a cylindrical casing, and is pressed by hydraulic pressure or the like along the radial direction of the upper surface of the table to be driven and rotated. A plurality of crushing rollers are provided at locations where the crushing rollers are equally divided in the circumferential direction of the table. The base end of the crushing roller is pivotally attached to the rotating table so as to be able to come in contact with and separate from the rotating table, and is mounted so as to be able to swing up and down. The grinding pressure is applied.

[0004] In such a vertical pulverizer, wear of the pulverizing roller and the table liner is inevitable due to continuous operation. If this is left unchecked, not only will the crushing capacity be reduced, but also the crushing roller and table liner will need to be replaced, which will increase replacement costs. Repairs are being carried out.

In the conventional method of repairing a crushing roller, an operator enters the inside of a mill housing, performs a weld overlay of a predetermined width using a part of the crushing roller in a circumferential direction as a first repair portion, and then manually operates the roller. , And moved to the next repair area to perform welding of a predetermined width in the same manner, and finally repair the entire circumference.

[0006]

However, in the above-mentioned conventional repair method, the roller body is locally heated in order to weld the portion of the same width along the circumferential direction of the crushing roller many times. Therefore, there is a problem that strain occurs and the material becomes brittle due to the influence of heat applied to the base material. In addition, since overlay welding is performed partially in the circumferential direction of the roller body, there is a problem that a weld seam is generated, vibration is generated during operation, and crushing performance is reduced. In addition, as a matter of course, there is a problem that the work efficiency is poor because the work is performed while the grinding roller is being turned by hand.

An object of the present invention is to provide a repairing method and apparatus which can prevent the adverse effect of the repairing operation on the grinding roller from being adversely affected by heat and can improve the working efficiency by focusing on the above conventional problems. .

[0008]

In order to achieve the above object, a method for repairing a crushing roller of a vertical crusher according to the present invention comprises:
In a method of repairing the crushing roller in a vertical crusher that crushes the raw material supplied onto the table by a rotary table and a crushing roller pressed and driven and rotated on the table, the crushing roller is separated from a table surface. The welding torch is held at a fixed position, and the welding torch is rotated at a low speed while rotating the roller body at a low speed by transmitting the rotation torque by pressing the rotating portion of a rotary driving means such as a hydraulic motor on a wheel cap attached to the tip of the grinding roller. In this method, a continuous build-up welding is performed and repaired by moving the roller along the roller axis direction.

Further, the apparatus for repairing a crushing roller according to the present invention is characterized in that in a vertical crusher for crushing a raw material supplied onto the table by a rotary table and a crushing roller pressed on the table and driven to rotate. An apparatus for repairing the wear surface of a crushing roller by overlay welding, wherein the welding torch disposed opposite to the surface of the crushing roller is attached to a copying means for guiding the crushing roller along the roller surface. A rotary drive means such as a hydraulic motor having a rotary portion having a projection which is pressed by a tip end wheel cap or which is fitted into a concave groove provided in the wheel cap; At this time, the grinding roller can be driven to rotate at a low speed.

[0010]

According to the above construction, the crushing roller to be repaired is separated from the rotary table surface so that the crushing roller can freely rotate, and the wheel cap at the axial end of the crushing roller is provided with a rotary drive means such as a hydraulic motor. In this state, the rotating torque is transmitted by pressing the rotating part, and the welding torch is moved along the surface of the roller body in the axial direction while the grinding roller is rotated at a low speed, thereby performing the repair. The rotation of the grinding roller is reduced to the extent that build-up welding is possible, and the welding torch is moved axially along the roller surface. The resulting weld bead is formed on the repair surface of the roller as a continuous line that is in close contact with each other. For this reason, the influence of heat due to welding is uniformly applied to the entire roller body in the circumferential direction, so that there is no local overheating. Moreover, since the weld bead is not cut in the circumferential direction of the roller, there is no weld seam, and the surface of the crushing roller after the repair is smooth, so that there is no hindrance to the crushing operation. Of course, the work of turning the grinding roller by hand one by one at the time of repair becomes unnecessary, and the working efficiency can be greatly improved.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vertical grinding machine according to the present invention.

The vertical crusher is provided with a disk-shaped rotary table 12 that is driven to rotate about a vertical axis at a lower portion of a housing 10, and is driven by being pressed against the upper surface of the rotary table 12 in a radial direction by hydraulic pressure or the like. The structure is such that a plurality of crushing rollers 14 to be rotated are provided at positions equally divided in the circumferential direction of the rotary table. The base end of the crushing roller 14 is connected to an arm 18 that can pivot about a horizontal rotating shaft 16 so as to be pivotally attached to and detachable from the rotating table 12 and swing vertically. Arm 18
Through a hydraulic cylinder 20. Therefore, the crushing roller 14 is pressed against the upper surface of the rotary table 12 by contracting the hydraulic silling 20 to apply a crushing pressure to the raw material supplied on the rotary table 12. The raw material is supplied from a charging chute 21 provided on the housing 10 onto the rotary table 12, and the input raw material is supplied to a portion where the rotary table 12 rotates and is engaged with the crushing roller 14, and the crushing roller It is pulverized under the rolling force of 14.

The crushing roller 14 in such a crusher
In the case of the roller, wear loss is likely to occur in a width of about 100 mm of a large diameter side portion of the roller body 22 formed in a truncated cone shape. In order to repair such a wear defect, a welding torch 24 for overlay welding to the roller body 22 and a rotation drive device 26 for the roller body 22 are installed on a rotary table.

First, the crushing roller 14 has a roller body 22 as a rotating body.
Is provided integrally with the rear end, and is attached to the rotating shaft 30 so as to be rotatable. The rotating shaft 30 is extended rearward and supported by a bearing arm 32, and the bearing arm 32 rotates about the horizontal rotating shaft 16.
8. The bearing arm 32 is penetrated and attached to a cover case 34 made of an elastic material that covers the opening of the housing 10. The bearing arm 32 covers and closes the opening of the housing 10 when the grinding roller 14 is set to the grinding position.

At the time of repair, the pulverizing roller 14 requiring repair is used.
Then, as shown in the figure, the rotary drive device is attached to the tip of the crushing roller 14 so that the rotating portion comes into contact with the axis of the wheel cap 14a which rotates integrally with the roller body 22 from the axial direction. 26 is placed on a rotary table. At this time, the inclination of the rotary driving device 26 is adjusted by the jack 26a so as to match the inclination of the axis of the crushing roller 14. The wheel cap 14a may be formed with a groove having an appropriate shape, while a protrusion corresponding to the groove may be provided at the tip of the rotating portion of the rotary drive device 26 to transmit torque, or vice versa. A protrusion may be provided, and a corresponding concave groove may be provided at the tip of the rotating portion of the rotation drive device 26.

On the other hand, a pedestal 36 is fixed to the upper portion of the crusher of the bearing arm 32, and the copying means 56 is set on the pedestal 36 so that the tip of the welding torch 24 is located at the end of the outer peripheral surface of the roller body 22. The copying means 56 includes a guide shaft 60 for supporting the welding torch 24 and a stand 58 connected to the guide shaft 60. A strong magnet that can be locked and unlocked is buried below the stand 58, and a guide is provided above the stand 58. Penetrate the shaft 60, and
It has a holding mechanism for supporting. For repair, submerged arc hardening overlay welding is performed. Welding torch 2
Numeral 4 is attached to a guide shaft 60 so as to be movable, so that it can be moved in the axial direction of the roller while keeping a constant gap with the roller surface. In the embodiment, the welding torch 24 is used.
Is manually moved, but it is also possible to use the guide shaft 60 as a screw rod to screw-fit the welding torch 24 and move the guide shaft 60 manually or by driving and rotating. The assembly of the welding torch 24 and its copying means 56 comprises a pedestal 36
However, since these are necessary only for repair, it is sufficient that only the pedestal 36 is detachably attached to the bearing arm 32 in advance.

A repair operation using the repair device configured as described above is performed as follows.

As the grinding operation continues, the grinding roller 14
The operation of the crusher is stopped when the outer periphery of the roller body 22 wears and needs to be repaired. After the raw material on the rotary table 12 in the crusher is removed, the hydraulic cylinder 20 corresponding to the crushing roller 14 requiring repair is slightly extended to lift the roller body 22 as shown in FIG. State.

Next, a rotary drive means 26 is mounted substantially at the center of the upper surface of the rotary table 12, and a bottom plate having one pin supported is operated by a jack 26a to rotate the rotary plate substantially at the center of the wheel cap 14a of the crushing roller 14. Adjust the height and inclination to make contact. Then, when power is supplied to the main body of the rotary drive device 26, that is, a hydraulic motor or a commercially available power torque wrench, and the rotating portion at the tip is rotated at a low speed,
The pressed and pressed roller body 22 is prepared to rotate integrally with the rotating portion.

Thereafter, the welding torch 24 and the copying means 56 are mounted on the pedestal 36, and the welding operation is set to a standby state. After the preparation is completed, when the rotation drive device 26 is started, the roller body 22 rotates quietly at a low speed. The number of rotations may be set so that the roller body 22 rotates at a low speed such that the peripheral speed of the roller body 22 is about 30 cm / min. With the roller body 22 thus rotated, the welding torch 2
4 is welded in the circumferential direction from the large-diameter side edge of the roller body 22, and after one rotation, while being pitch-shifted by the welding bead width, is guided by the guide shaft 60 and is guided along the outer surface of the roller body 22. In this way, continuous build-up welding is performed by moving in the roller axis direction.

As described above, according to the present embodiment, the welding torch 2 is rotated while the roller body 22 is continuously rotated at a constant rotation speed.
Since the repair work can be performed by moving the roller 4 along the surface of the roller body 22 in the axial direction, the welding bead is continuously formed with a constant thickness, and the roller body 22 is locally overheated. This prevents the occurrence of thermal strain and the weakening of the base material. In addition, since the weld bead does not break in the circumferential direction of the roller body 22, the roller surface can be smoothed, and rattling due to a step between the repaired portions can be prevented as in the related art, and the crushing ability is reduced. No more. Particularly, in the past, since the grinding roller 14 was rotated by hand, it took a whole day to repair one grinding roller 14.
The repair work was completed in 3 hours, and the work efficiency was greatly improved.

[0022]

As described above, according to the present invention,
The repair is performed by moving the torch along the surface of the roller body in the axial direction while rotating the grinding roller at a constant speed during overlay welding with the welding torch.
The weld bead can be formed on the repair surface of the roller as a continuous line that has a certain thickness and is in close contact with each other, and the effect of heat during welding is uniformly applied to the entire roller body in the circumferential direction. There is no local heating. Moreover, since the weld bead is not cut in the circumferential direction of the roller, there is no weld seam, the surface of the crushing roller after the repair becomes smooth and the crushing accuracy does not decrease, and the crushing roller is manually repaired during the repair. There is no need to rotate the work, and the work load and work efficiency can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a vertical crusher to which a repair device according to an embodiment of the present invention is assembled.

FIG. 2 is a side view of the repair device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Housing 12 Rotary table 14 Crush roller 14a Wheel cap 22 Roller main body 24 Welding torch 26 Rotation drive device 26a Jack 28 Roller boss 34 Cover case 36 Base 56 Copying means 58 Stand 60 Guide shaft

Claims (2)

(57) [Claims] 1. A method of repairing a crushing roller in a vertical crusher for crushing a raw material supplied onto the table by a rotary table and a crushing roller pressed on the table and driven to rotate, the method comprising: By pressing the rotating part of the rotary drive means such as a hydraulic motor on the wheel cap and transmitting the rotating torque to rotate the roller body at low speed, the welding torch is moved in the roller axis direction along the outer peripheral surface of the roller body. A method of repairing a crushing roller of a vertical crusher, which performs repair by performing continuous overlay welding. 2. A wear surface of the crushing roller in a vertical crusher for crushing a raw material supplied onto the table by a rotary table and a crushing roller pressed on the table and driven to rotate, to repair a worn surface of the crushing roller by overlay welding. A welding torch disposed opposite the surface of the crushing roller, attached to a copying means for guiding the roller along the roller surface, and pressed against a wheel cap at the axial end of the crushing roller, or A crushing roller repairing device for a vertical crusher provided with rotary driving means such as a hydraulic motor having a rotating portion having a projection fitted into a concave groove provided in the wheel cap.