JP7425994B2 - Thickener rake swing bearing inspection device - Google Patents

Description

The present invention relates to a method for maintaining a thickener rake slewing bearing (hereinafter also referred to as rake slewing bearing) in a thickener used in wet separation treatment of ores.

Thickeners that separate ores (see, for example, Patent Document 1) are used for continuous operation for long periods of time.
In the thickener, as shown in FIG. 1, for example, a rake 1 disposed inside a thickener structure Sa composed of a thickener can body and a beam rotates around a rake rotation axis 2.

The rake swing bearing (see Fig. 2 , code 3) in the area surrounded by the dotted line is worn out due to long-term operation, and the axial clearance increases.The rake swing bearing is one of the important parts of the thickener, and is one of the important components of the thickener. In order to operate the rake swing bearing, it is important to understand the wear and tear on the rake swing bearing and replace it in a planned manner.

If this wear and tear on the rake swing bearing cannot be grasped and the wear and tear on the rake swing bearing is left unchecked until the thickener becomes inoperable, this will lead to an unexpected stoppage of the thickener that is not part of the production plan, and the damaged rake swing bearing will need to be replaced. This has a major impact on production activities.

Therefore, the usual way to check the wear and tear of the rake slewing bearing is to stop the thickener for a short period of time, remove the drive section located at the top of the rake slewing bearing, and check the inside of the rake slewing bearing, or empty the inside of the thickener. The method used is to move the rake vertically and check the clearance inside the rake swivel bearing.

This method of determining the wear and tear of the rake slewing bearing has the problem of having to stop the thickener, which affects production activities. Another problem arises in that it requires additional work.
Therefore, a method of replacing the rake slewing bearing at regular intervals within a tolerable impact on production activities could be considered, but in that case, there would be the problem of requiring a large inventory of rake slewing bearings for replacement and the need for replacement work. It will happen.

Japanese Patent Application Publication No. 2014-37632

In view of this situation, it has been necessary to minimize the impact on production activities and the costs necessary for inspection in order to carry out economical production and maintenance activities.

The present invention enables inspection to be carried out to monitor the condition of the thickener rake slewing bearing, without removing the thickener drive unit (drive motor and drive reducer) or emptying the thickener, and detecting wear and tear in the axial direction of the thickener rake slewing bearing. To provide an inspection device that can measure the gap between.

The rake swing bearing inspection device of the present invention is constructed by attaching a scale directly or indirectly to the rake swing bearing. The thickener rake slewing bearing inspection device of the present invention is designed to be able to measure the difference in height between the value on the scale and an arbitrary reference point provided within the visible range of the scale, that is, the change in relative position. Periodically measure the height difference between the reference point and the scale. When the axial gap caused by wear of the rake swing bearing increases, the difference in height between the reference point and the scale changes, and the change in relative axial position caused by the wear of the rake swing bearing can be measured. Monitor changes in this relative position. Based on the results of measuring the state change, planned and necessary minimum rake swing bearing replacement can be carried out.

The first aspect of the present invention is a thickener rake slewing bearing inspection method that detects the relative position of a separate thickener rake slewing shaft side bearing member and a thickener structure side bearing member that constitute a pair of thickener slewing bearings. In the apparatus , the relative position is detected by detecting a height difference between the thickener rake rotation shaft side bearing member and the thickener structure side bearing member,
It is composed of a detection reference part and a scale, the detection reference part is installed and fixed at a location that reproduces the movement of the bearing member on the side of the thickener structure, and provides a detection reference point for the relative position , and the scale is configured to This thickener rake swing bearing inspection device is installed and fixed on a rake swing shaft side bearing member and displays the relative position.

A second invention of the present invention is a thickener rake swing bearing inspection device that detects the relative position of a separate thickener rake swing shaft side bearing member and a thickener structure side bearing member that constitute a thickener swing bearing pair. , the relative position is detected by detecting a difference in height between the thickener rake rotation shaft side bearing member and the thickener structure side bearing member, and the scale is composed of a detection reference part and a scale, and the scale is configured to detect the height difference between the thickener rake rotation shaft side bearing member and the thickener structure side bearing member, The detection reference section is installed and fixed at a location that reproduces the movement of the bearing member on the structure side, and displays the relative position, and the detection reference section is installed and fixed on the bearing member on the thickener rake rotation shaft side, and detects the relative position . This is a thickener rake swing bearing inspection device characterized by providing a reference point.

A third aspect of the present invention includes a scale extending from a base, and a second scale attached to the base of the scale on a thickener rake pivot shaft side bearing member so that the scale is parallel to the axial direction of the thickener rake pivot shaft. and a first fixture for fixing the scale to the thickener rake pivot shaft side bearing member , the tool has a height detection reference point, and has a height detection reference point, The detection reference point is attached at a location that reproduces the movement of the thickener structure side bearing member so as to interlock with the position of the thickener structure side bearing member that is paired with the thickener rake rotation shaft side bearing member. This is a thickener rake swing bearing inspection device characterized by having a detection reference part.

In a thickener equipped with the device according to the present invention, it is possible to detect an axial gap caused by wear and tear on the rake swing bearing without stopping the thickener or emptying the inside of the thickener. As a result, the rake swing bearing can be replaced in a planned manner without leaving the rake swing bearing unattended, so that production activities can be carried out smoothly, which has a significant industrial effect.

1 is a schematic cross-sectional view of one embodiment of a thickener in which the present invention is used; FIG. FIG. 2 is a schematic cross-sectional view of a thickener drive section and a rake pivot shaft bearing section according to an embodiment of the present invention. 1 is a thickener rake swing bearing inspection jig according to an embodiment of the present invention. It is a conceptual diagram explaining the situation when a rake swing bearing wears out, (a) shows a normal state, and (b) shows a state where the bearing is worn out and the gap in the axial direction has increased.

This embodiment allows inspection to be performed to monitor the condition of the rake slewing bearing without removing the thickener drive unit (drive motor and drive reducer) or emptying the thickener. This is an inspection device that can measure the gap between.
This embodiment will be described below with reference to the drawings.

FIG. 1 is a schematic sectional view of an embodiment of a thickener in which this embodiment is used, where S is a thickener, Sa is a thickener structure consisting of a thickener can body and a beam (or lid, walkway), and A is a rake turning. The bearing section, C is a rake drive section, 1 is a thickener rake, 1a is a blade, and 2 is a rake pivot shaft (also referred to as a thickener rake pivot shaft).
The thickener S includes a thickener structure Sa composed of a thickener can body and a beam, and includes a thickener rake 1 that rotates inside the thickener can body. The thickener rake 1 includes a blade 1a that strokes the solid matter deposited on the bottom of the thickener in the circumferential direction, and a rake rotating shaft 2 that connects the blade and a drive source (drive part) to transmit driving force so as to penetrate the solution in the thickener. We are prepared.

The thickener rake rotation bearing inspection jig 7 according to this embodiment is a jig that is used by being installed and fixed on the upper surface U of the rake rotation shaft 2, as shown in FIG.
FIG. 2 is a schematic cross-sectional view of a thickener drive section and a rake rotation bearing section according to the present embodiment, in which 4 is a spline, 5 is a drive reducer, and 6 is a drive motor, which constitutes a rake drive section C. Further, 8 is a detection reference portion, and 7 is a thickener rake swing bearing inspection jig, which constitute a rake swing bearing inspection device. The detection reference section 8 can be arranged so as to constitute a rake pivot bearing section A together with a rake pivot bearing 3.

In the rake drive section C, the rotational force generated by the drive motor 6 is transmitted to the spline 4 via the drive reducer 5. The spline portion is connected to the rake rotation shaft and rotates the thickener rake. A rake swing bearing 3 is attached to support the rotating rake swing shaft 2. The jig 7 of this embodiment is attached to the upper surface of the thickener rake rotating shaft side bearing member 3B, and the detection reference portion 8 is provided at a location that reproduces the movement of the thickener structure side bearing member 3A (Fig. 4 (see also). The rake swing bearings 3 are normally arranged at equal intervals in the circumferential direction of the rake swing shaft 2, but it is sufficient to have thickener rake swing bearing inspection devices (7+8) only in the necessary directions.

FIG. 3 shows an enlarged explanatory view of the thickener rake swing bearing inspection jig 7 according to the present embodiment shown in FIG. 2.
The thickener rake swivel bearing inspection jig 7 of the present embodiment has a second fixture attached to the base of the scale 13 carved at equal intervals so as to cover the bolt head on the top surface of the thickener rake swivel bearing. It is provided with a jig mounting hole 11 and a jig fixing set screw 12 of a first fixture for fixing the thickener rake swing bearing inspection jig 7 in a covered state.

Next, an example of how to attach the device according to this embodiment and how to use it will be explained.
The thickener rake swivel bearing inspection jig according to the present embodiment shown in FIG. They were fitted and attached, and further fixed using the jig fixing set screw 12 of the first fixture.
In this embodiment, an example is shown in which four bearings are mounted at equal intervals on the circumference of the upper surface of the bearing. It is possible to install one bearing, but by installing at least two or six bearings at 60 degree intervals, it will be easier to detect problems due to deterioration of the bearing, such as the rake being tilted and the load being unbalanced.

Detection of bearing defects is performed as follows. First, a detection reference section 8 constituting an arbitrary reference point is provided around the thickener, and the relative position between the reference point and the scale provided on the jig of this embodiment is periodically changed. Measure the height of each and find the difference between the heights. The difference in height between this regular reference point and the scale provided on the jig of this embodiment corresponds to the size of the axial gap that occurs in the thickener rake swing bearing. For example, if the gap is 0 mm when the height difference is 70 mm, the gap will be 5 mm when the height difference is 65 mm, which is a decrease of 5 mm (or an increase of 5 mm depending on the direction of the scale). Therefore, by capturing changes in measured values (height differences) over time, it is possible to understand changes in the axial clearance that occurs in the rake swing bearing.

As the detection criteria, the lower and upper limits of the gap are predetermined as values that are expected to cause trouble in rake operation, and when these values are exceeded, it is regarded as a malfunction. Even if the measured value (difference in height) indicated by a certain thickener rake swing bearing inspection jig 7 is somewhat larger than the measured value (difference in height) indicated by another thickener rake swing bearing inspection jig 7, the rake inclination・It is considered a defect as it indicates positional deviation.

Note that the detection reference section 8 is installed and fixed in a pair with the thickener rake swing bearing inspection jig 7, and is installed and fixed at a position that reproduces the movement of the thickener structure side bearing member 3A. When installing multiple pieces, the rake rotation shaft 2 rotates and moves in the horizontal direction of the thickener rake rotation bearing inspection jig 7, which may be used to save the number of installation bases 7 or 8. In this case, The installation bases of 7 and 8 do not match.

Although the above description has been made with the scale installed and fixed on the rake rotation axis side and the detection reference section installed and fixed on the thickener structure side, the same function can be achieved even if the positional relationship is reversed. That is, a combination may be used in which the scale is installed and fixed on the thickener structure side, and the detection reference section is installed and fixed on the rake rotation axis side.

Using the thickener rake swing bearing inspection jig according to this example, three thickeners were installed at equal intervals, and the wear condition of the thickener rake swing bearings was investigated before and after ore processing of nickel oxide ore. , the possibility of detecting wear and tear was evaluated.

FIG. 4(a) shows the state of the swing bearing before ore processing, and FIG. 4(b) shows the state of the swing bearing after half a year of processing.
In FIG. 4(b), it was visually observed that the axial clearance δ had increased due to wear and tear on the rake pivot bearing, and the rake pivot shaft was lowered (black arrow in FIG. 4(b)).
Therefore, by measuring the height difference between the reference point 8A installed on the thickener and the scale (not shown) provided on the jig 7 of this embodiment, the axial gap existing in the rake swing bearing can be measured. Compare history.
In the normal state (Fig. 4(a)), when the axial clearance existing in the rake swing bearing is 0 mm, the relative position value (height difference) δ with respect to the reference point was 70 mm. On the other hand, after half a year of treatment (FIG. 4(b)), the axial clearance increased due to wear and tear on the rake swing bearing, and δ was 65 mm. At this time, the axial gap existing in the rake slewing bearing was 5 mm, and it was confirmed that the axial gap existing in the rake slewing bearing could be grasped.

1 Thickener rake 1a Blade 2 Rake rotation shaft 3 Rake rotation bearing 3A Thickener structure side bearing member 3B Thickener rake rotation shaft side bearing member 4 Spline 5 Drive reducer 6 Drive motor 7 (Thickener rake rotation bearing inspection) jig 8 Detection reference part 8A Reference point 11 Second fixture (jig installation hole)
12 First fixture (jig fixing set screw)
13 Scale A Rake rotation bearing C Rake drive S Thickener Sa Thickener structure (can body + beam or lid, walkway)
U Rake rotation axis top surface

Claims (3)

A thickener rake swing bearing inspection device that detects the relative position of a separate thickener rake swing shaft side bearing member and a thickener structure side bearing member that constitute a pair of thickener swing shaft bearings,
The detection of the relative position is performed by detecting a difference in height between the thickener rake rotation shaft side bearing member and the thickener structure side bearing member,
Consists of a detection reference part and a scale,
the detection reference part is installed and fixed at a location that reproduces the movement of the thickener structure side bearing member, and provides a detection reference point for the relative position ;
A thickener rake swing bearing inspection device, wherein the scale is installed and fixed on the thickener rake swing shaft side bearing member to display the relative position. A thickener rake swing bearing inspection device that detects the relative position of a separate thickener rake swing shaft side bearing member and a thickener structure side bearing member that constitute a pair of thickener swing shaft bearings,
The detection of the relative position is performed by detecting a difference in height between the thickener rake rotation shaft side bearing member and the thickener structure side bearing member,
Consists of a detection reference part and a scale,
the scale is installed and fixed at a location that reproduces the movement of the thickener structure side bearing member, and displays the relative position;
A thickener rake swing bearing inspection device, wherein the detection reference portion is installed and fixed on the thickener rake swing shaft side bearing member and provides a detection reference point for the relative position . A scale extending from the base,
a second fixture attached to the base of the scale to the thickener rake pivot shaft side bearing member so that the scale is parallel to the axial direction of the thickener rake pivot shaft ;
A thickener rake rotating bearing inspection jig includes a first fixture for fixing the scale to the thickener rake rotating shaft side bearing member , and
Has a height detection reference point,
The detection reference point is attached at a location that reproduces the movement of the thickener structure side bearing member so that the detection reference point is interlocked with the position of the thickener structure side bearing member that is paired with the thickener rake rotation shaft side bearing member. A thickener rake swing bearing inspection device characterized by having a detection reference part.

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