JPH04338032A - Examination for facility of reclaimer - Google Patents

Abstract

PURPOSE:To constantly examine the facility of a reclaimer for collecting and carrying bulk material stacked in a yard in a quantitative way. CONSTITUTION:Inner rings 20a and 20b of a turning bearing 20 provided in a reclaimer turning means 5 are fixed to a fixing side frame 4 by means of a mounting bolt 22. An outer ring 20c of the turning bearing 20 is fixed to a turning side frame 6 by means of a mounting bolt 23. On the respective upper sides and the lower sides of the mounting bolts 22 and 23 distortion gauges 25a and 25b, and 25c and 25d are mounted. Distortion generated on the bolts 22 and 23 are measured by these distortion gauges 25. Stress values are calculated from the obtained distortion values. The on-line examination of a facility is carried out in accordance with the stress generating state of the mounting bolts 22 and 23 based on the calculated stress values.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is intended to improve stress generation conditions that act on the mounting bolts of the slewing bearings of reclaimers that extract and transport bulk raw materials such as coal and ore in yards. The present invention relates to a method for diagnosing equipment for a reclaimer that can be used to ascertain and prevent failures of the mounting bolts.

0002

[Prior Art] A reclaimer, which plays the role of collecting bulk raw materials such as ore and coal deposited in a raw material yard and feeding them to an above-ground conveyor, is arranged at the tip of a boom 7 in a reclaimer 40 as shown in FIG. At the wheel loader 7a,
Collect bulk raw materials (hereinafter referred to as raw materials) in the yard,
The structure is such that this is fed to a ground conveyor through a boom conveyor 7b and then a chute 8 provided at the center of the revolving frame. By the way, in the process of collecting raw materials by the foil loader 7a disposed in the reclaimer 40, the raw materials that have fallen from the foil loader 7a adhere to and accumulate on peripheral equipment, so if the amount of adhered materials increases, the tip of the boom conveyor 7b load increases.

In this case, the load acting on the mounting bolt tightened to the swing bearing of the swing device 5 provided in the central portion of the swing frame 6 coupled to the boom conveyor 7b becomes large, which causes the mounting bolt to tighten. Stress will increase. When the stress value further increases and the stress of the mounting bolt reaches a yield point or even a breaking stress, the mounting bolt breaks and the reclaimer 40 becomes unusable. Note that 3 indicates a traveling device of the reclaimer 40, 4 indicates a gate-shaped fixed side frame, 9 indicates a weight, and 11 and 13 indicate frames.

In order to prevent such breakage of the mounting bolts, conventionally a wire rope 31 is attached to the boom 7 of the reclaimer 40 as shown in FIG. The load applied to the boom tip is periodically measured with a weighing device 32 at a rate of about once every six months, and compared with a reference value of the boom tip load set separately, and the load applied to the mounting bolt is estimated, The magnitude of stress generated in the mounting bolts was determined. Furthermore, inspectors on the operation side or on the maintenance side regularly perform visual inspections of the mounting bolts to check for the presence or absence of bolt breakage.

[0005]

However, according to the conventional method as described above, equipment such as equipment, a scale, a wire rope, etc., and several workers are required for hoisting the boom. Furthermore, it is necessary to stop the reclaimer for several hours in order to grasp the weight balance state of the reclaimer. Furthermore, in order to ensure safety, it is necessary to carry out regular inspections about once a month, and it is currently not possible to easily grasp the weight balance state of the reclaimer. Furthermore, when inspecting the appearance of the mounting bolts, only broken bolts can be found, making it difficult to prevent the mounting bolts from breaking and prevent equipment troubles.

It is an object of the present invention to propose a new method for quickly and accurately diagnosing a mounting bolt attached to a swivel bearing of a reclaimer swivel device without stopping raw material collection in a yard. .

[0007]

[Means for Solving the Problems] To achieve the above object, the present invention provides a reclaimer for collecting and transporting bulk raw materials accumulated in a yard, which is disposed on the rotating side of the upper part of the machine body, and is arranged on the fixed side frame. When diagnosing reclaimer equipment by measuring the load applied to the swivel device that rotates the frame, among the slewing bearings installed in the swivel device, the mounting bolts that fix the inner bearing ring to the stationary frame and the outer bearing ring are Attach strain gauges to each of the mounting bolts fixed to the swing side frame, use these strain gauges to measure the strain generated in each mounting bolt due to the load applied to the swing device, and use the obtained strain value to measure the strain on each of the mounting bolts. A method for diagnosing equipment for a reclaimer, characterized in that the stress generation state of the mounting bolt is grasped by calculating the stress value acting on the mounting bolt and calculating the calculated stress value with the allowable stress value of the mounting bolt. .

Furthermore, in the present invention, even if an ultrasonic axial force sensor is used in place of the strain gauge, the state of stress generation in the mounting bolt can be grasped in the same manner. Now, FIG. 3 shows an overall schematic side view of the reclaimer 40, and the reference numeral 1 in FIG. 3 indicates an above-ground conveyor, 2, which is installed in a yard and is in charge of transporting raw materials such as ore and coke to a blast furnace, sintering, or a coke factory. is a traveling rail, and 3 is a traveling device movable along the traveling rail 2. Reference numeral 4 designates a gate-shaped fixed side frame placed on the traveling device 3 across the ground conveyor 1, 5 a swing device placed on the top of the gate-shaped fixed side frame 4, and 6 a swing device mounted on the swing device 5. It is a rotating frame that is connected via bolts, etc.

Reference numeral 7 denotes a boom equipped with a wheel loader 7a for collecting raw materials in the yard and a conveyor 7b for transporting the raw materials collected by the wheel loader 7a, and the rear end of the boom 7 can be rotated via a pivot pin 7c. It is connected to the frame 6. Moreover, 8 is a chute for discharging the raw material conveyed by the boom conveyor 7b provided on the boom 7 to the ground conveyor 1.

Reference numeral 9 is a weight for maintaining balance when raising and raising the boom 7; 10 is a sheave; 11 is a connecting frame whose one end is pivotally connected via a sheave 11a;
Reference numeral 2 denotes an elevation post, one end of which is connected to the sheave 10 via a pivot pin 13a, and the other end is connected to the boom 7. Further, 13 is a connection frame connecting the sheave 10, the weight 9, and the revolving frame 6, 14 is a sheave held by the revolving frame 6, and 15 is an elevating device equipped with a drive source 15a such as an electric motor and a wire drum. . 16 is an elevation device 15 and sheaves 10, 14
17 is a conveyor drive device that drives the boom conveyor 7b, 18 is a wheel loader drive device, and 19 is a reclaimer swing drive device.

Next, referring to FIG. 1, the swing device 5 and swing bearing 20 of the reclaimer 40 and their mounting method will be explained. That is, FIG. 1 shows the swing bearing 2 in the swing device 5.
0, in which a swing bearing 20 is mounted sandwiched between a gate-shaped fixed side frame 4 and a swing frame 6. Balls 20d and 20e are sandwiched between bearing inner rings 20a and 20b and bearing outer ring 20c, and the swing bearing 20 is configured. Furthermore, the bearing inner ring 20a
, 20b are fixedly attached to the gate-shaped stationary side frame 4 with mounting bolts 22, and the bearing outer ring 20c is fixedly fixed to the swing frame 6 with mounting bolts 23, thereby forming the swing device 5 as a whole.

Next, the configuration of the measuring device of the present invention will be explained. First, as shown in FIG. 1, holes 24a, 24b and 24c, 24d are drilled at both ends of the mounting bolts 22, 23, respectively.
Insert the strain gauges 25a, 25b, 25c, and 25d into the holes 24a, 25b, 25c, and 25d, respectively, and apply the adhesive to the inner surfaces of the holes 24a, 24b, 24c, and 24d formed in the mounting bolts 22 and 23. wear.

[0013] And strain gauges 25a, 25b, 25c,
Lead wires 26a and 26b respectively taken out from 25d
, 26c, 26d are connected to distortion converters 27a, 27b,
A computer 28 is connected to the strain converters 27a, 27b via cables 30a, 30b, and the mounting bolts 22, 2
Input the amount of strain in step 3 into the calculator 28, and then tighten the mounting bolts 22 and 23.
The strain amount and stress value are calculated and compared with preset reference values. Note that the strain is measured for each pair of upper and lower mounting bolts 22 and 23, respectively.
Since the stress applied to the head part 23 and the opposite side thereof are different, a difference occurs in the amount of strain. This is because it is necessary to individually evaluate the amount of strain for each strain gauge. 29 is a cathode ray tube display (CRT) that displays the calculation results of the computer 28.

In the above, the upper ends of the mounting bolts 22, 23,
The explanation has been given of a device in which strain is measured by providing a hole at the lower end and inserting and pasting a strain gauge into the hole, but as shown in FIG. , 31b are provided respectively, and the mounting bolts 2
Strain gauges 25e and 25f may be attached to the intermediate portions of 2 and 23 and taken out with lead wires 26e and 26f through grooves 31a and 31b for measurement.

In the reclaimer 40 having the configuration shown in FIG. 3, the raw material in the yard collected by the wheel loader 7a is discharged to the ground conveyor 1 through the boom conveyor 7b and the chute 8, thereby conveying the raw material to a blast furnace or the like. , in the process of collecting such raw materials, the foil loader 7a
The raw material powder may stick directly to the peripheral equipment of the wheel loader 7a or the main body of the wheel loader 7a, or the raw material powder may fall from the boom conveyor 7b and accumulate on the boom 7 during the process of being conveyed by the boom conveyor 7b.

[0016] Therefore, during long-term operation, the weight at the tip of the boom 7 increases, and if this increase becomes excessive, the boom 7 is connected to the swing device 5, so the boom 7 is transmitted to the swing device 5 via the boom 7, and the load acts on the mounting bolts 22, 23 of the swing bearing attached to the swing device 5, thereby reducing stress on the mounting bolts 22, 23. becomes too large and there is a risk of breakage.

Conventionally, in order to prevent the operation of the reclaimer from stopping due to the breakage of the mounting bolts, the wire rope of the wheel loader 7a portion of the reclaimer 40 was periodically removed as shown in FIG. Multiply by 31. Then, this wire rope 31 is lifted by a lifting machine 33 with a weighing device 32 hanging thereon, and its weight is measured, the load applied to the mounting bolt of the swing bearing is determined, and the stress state of the mounting bolt is diagnosed. Was. However, such a diagnostic procedure cannot be said to be an effective method because it requires a great deal of effort and time as described above.

[0018] In this invention, the reclaimer 40 particularly includes:
Mounting bolts 22, 2 of the swing bearing 20 provided in the swing device 5
3, the strain of the mounting bolts 22, 23 is measured as a strain amount by strain gauges 25a, 25b, 25c, 25d and strain converters 27a, 27b, and the strain amount is transmitted to a computer 28. . The calculator 28 calculates the amount of strain of the mounting bolts 22, 23 from the value of the amount of strain on the mounting bolts 22, 23.
It is calculated as the stress value that occurs in

This stress value is determined by the preset mounting bolt 2.
Compared to the allowable stress values of No. 2 and 23, if the stress exceeds the allowable stress values, an alarm is outputted and displayed on the CRT 29. In addition, since the CRT 29 is normally configured to display the stress values of the mounting bolts 22 and 23, the reclaimer 40
The load condition of the mounting bolts 22 and 23 of the swing bearing 20 provided in the swing device 5 can be grasped online.

[0020]

[Example] Next, an example according to the present invention is shown in FIGS. 1 and 4.
The explanation will be based on. In this embodiment, strain gauges 25a, 25b, 25c, 25 are attached to mounting bolts 22, 23 that fix the swing bearing 20 to the gate-shaped stationary frame 4.
I installed d. Strain gauges 25a, 25b and 25 are installed on the heads of the mounting bolts 22, 23 and on the opposite side of the heads, respectively.
c, 25d is installed, but this is the mounting bolt 22
, 23 and the opposite side thereof, the effective cross-sectional area in the axial direction of the mounting bolts 22, 23 differs depending on the presence or absence of the bolt thread part. It makes a difference.

[0021] Therefore, in order to measure the amount of strain of the mounting bolts 22, 23, it is necessary to separately install strain gauges on the heads of the mounting bolts 22, 23 and on the opposite side thereof. As in the embodiment, strain gauges are attached to both ends of the mounting bolts 22 and 23, respectively. Furthermore, the value of the amount of strain measured by each strain gauge is evaluated for each individual strain gauge.

Furthermore, since the portal frame 4 side is normally fixed and the rotating frame 6 side is movable, a strain transducer 27 is installed on each side.
a and 27b are provided. In this case, the mounting bolt 22,
In order to measure the amount of strain in 23, in addition to the strain gauge, an ultrasonic axial force meter sensor is attached to the end of the bolt head, and the amount of strain in the mounting bolt is measured by the converter of the axial force meter. There is also. FIG. 4 is a measurement example in which the amount of strain generated in the mounting bolt of the swing bearing provided in the swing device according to the present invention and the value obtained by converting this amount of strain into a stress value are displayed on the CRT 29. The dimensions of the mounting bolt are M30 x l230 (mm), the bolt material is F11 (high strength bolt), and the effective cross-sectional area of the bolt is the head.
It is 706 mm2, and the threaded part is 561 mm2. Since there are more than ten mounting bolts whose strain is being measured, the CRT 29 displays the strain and stress values in a trend graph by color-coding each bolt. In the case of FIG. 4, it can be seen that all stress values are moving in a stable trend with the allowable stress of 130 Kgf/mm2 or less, but the mounting bolt 22 (threaded portion) is quite close to the allowable stress value.

[0023]

According to the present invention, it is possible to measure and monitor on-line the strain and stress values of the mounting bolts caused by the load applied to the mounting bolts of the swing bearing provided in the swinging device of the reclaimer. As a result, it is possible to constantly and quantitatively grasp the state of stress generation in the mounting bolts, and there is no need to perform tasks such as measuring the weight or visually inspecting the mounting bolts that were carried out regularly in the past. You can save a lot of time and effort.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a swivel bearing structure of a reclaimer according to the present invention.

FIG. 2 is a sectional view showing another swing bearing structure of a reclaimer according to the present invention.

FIG. 3 is a side view schematically showing the entire reclaimer according to the present invention.

FIG. 4 is a diagram showing changes in strain and stress of the mounting bolt according to the present invention.

FIG. 5 is a side view schematically showing the entire reclaimer according to a conventional example.

[Explanation of symbols]

1 Ground conveyor 2 Traveling rail 3 Traveling device 4 Fixed side frame 5 Swivel device 6 Swivel frame 7 Boom 7a Wheel loader 7b Boom conveyor 7c Pivot pin 8 Shoot 9 Weight 10 Sheave 11, 13 Connecting frame 12 Elevation post 13a Pivot pin 14 Sheave 15 Elevation device 16 Wire rope 17 Conveyor drive device 18 Wheel loader drive device 19 Swing drive device 20 Swivel bearing 20a, 20b Bearing inner ring 20c Bearing outer ring 20d, 20e Ball 21 Gear 22, 23 Mounting bolt 24a-24d Hole 25a-25f Strain gauge 26a-26f Lead wire 27a, 27b Distortion converter 28 Calculator 29 CRT 30a, 30b lead wire 31a, 31b Wiring groove 40 Reclaimer

Claims (2)

[Claims] Claim 1: In a reclaimer that collects and transports bulk raw materials accumulated in a yard, the load applied to the rotating device that is interposed on the fixed frame and rotates the rotating frame on the upper part of the machine body is measured. When performing equipment diagnosis, among the swing bearings provided in the swing device, a strain gauge is attached to each of the mounting bolts that fix the bearing inner ring to the fixed side frame and the mounting bolt that fixes the bearing outer ring to the swing side frame, Using these strain gauges, the strain generated in each mounting bolt due to the load applied to the swing device is measured, and the stress value acting on each mounting bolt is calculated from the obtained strain value, and this calculated stress value is applied to the mounting bolt. By comparing and calculating the allowable stress value of the mounting bolt,
A method for diagnosing equipment for a reclaimer, characterized in that the state of stress generation in the mounting bolts is ascertained. 2. The reclaimer equipment diagnosis method according to claim 1, wherein an ultrasonic axial force sensor is used in place of the strain gauge.