JP3607791B2 - Bucket support device for continuous unloader - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bucket support device that moves while supporting a load during excavation of each bucket at a scraping portion of a continuous unloader.
[0002]
[Prior art]
The bucket of the continuous unloader is attached to an endless chain, excavates the conveyed product while going around the lower end of the scraping part, lifts it vertically, and then delivers the scraped conveyed product to another conveyor or the like. It is like that.
[0003]
When the lower end of the scraping portion is moved, the bucket moves horizontally while being guided by a bucket support device that receives a reaction force during scraping. The bucket support device is guided by engaging a guide roller provided on the back surface of the bucket with a guide rail fixed to a fixed portion of the scraping portion.
[0004]
When scraping the transported object, the transported object or other foreign matter may be caught between the guide rail and the guide roller.
[0005]
In such a case, in order to prevent an excessive load from being applied to the guide rail and the guide roller, the guide rail is fixed to the fixing portion of the scraping portion via a cushioning material made of an elastic body such as rubber, and is conveyed. Even if an object is bitten, the guide rail escapes from the guide roller.
[0006]
[Problems to be solved by the invention]
However, if the cushioning material for escape is provided, the guide rail is always subjected to a force that moves the guide material in the direction of escaping from the guide roller when excavating the transported object with the bucket. There is a problem that a roller and a guide rail have a small allowance, and the guide rail is worn early.
[0007]
Therefore, an object of the present invention is to solve the above-described problems, and does not apply an excessive load to the guide rail and the guide roller even if the transported object is caught between the guide roller and the guide rail, and in normal excavation. It is an object of the present invention to provide a bucket support device for a continuous unloader that does not wear guide rails at an early stage.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a pair of guide rollers in the width direction on the back side of each bucket so as to move while supporting the load during excavation of each bucket at the scraping portion of the continuous unloader, In the bucket support device of the continuous unloader in which the guide rail for rolling the pair of guide rollers to hold the bucket is disposed in the scraping portion, the guide rail is fixed to the fixing portion of the scraping portion with respect to the guide roller. A cushioning material that is supported by a rotatable support body that can escape in the width direction and that is supported by the support body and constantly urges the guide rail toward the guide roller in a gap formed between the support body and the fixed portion. as is the buffer material and the fixing portion so as to urge the predetermined elastic force the gap between the support which was won regulations provided with.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0010]
As shown in FIG. 1, the continuous unloader 1 is provided by extending a boom 3 that can be raised and lowered from a traveling unit 31 that travels on a wharf 30, and scrapes a conveyed product (not shown) from the lower side to the tip of the boom 3. An endless bucket conveyor 32 is provided which is picked up and transported onto the boom 3.
[0011]
The endless bucket conveyor 32 is a telescopic shape provided by a swing mast 33 provided at the tip of the boom 3 so as to extend downward and a hydraulic cylinder mechanism 35 supported at a lower end of the swing mast 33 so as to extend in one horizontal direction. A telescopic frame 5 that can be raised and lowered (hereinafter, the extension direction of the telescopic frame is assumed to be the front), a sprocket (not shown) provided at the upper end of the swivel mast 33, and provided at both ends of the telescopic frame 5 The sprocket 8 includes an endless chain 34 spanned between the sprockets 8, and a plurality of buckets 9 provided on the endless chain 34.
[0012]
Further, a scraping portion 2 is formed at the lower portion of the endless bucket conveyor 32 so as to circulate an endless chain 34 around the telescopic frame 5, and the conveyed product is scraped off at the lower end of the scraping portion 2. Yes.
[0013]
The telescopic frame 5 includes a rear frame 6 connected to the lower end of the swivel mast 33 and extending in the horizontal direction, and a front frame 7 provided so as to be slidable relative to the rear frame 6.
[0014]
As shown in FIG. 2, each bucket 9 is supported by the telescopic frame 5 via a bucket support device 10 when moving the lower end of the telescopic frame 5.
[0015]
The bucket support device 10 includes a pair of guide rollers 11 provided on the back surface 29 of each bucket 9 and guide rails 12 disposed at the bottom of the front frame 7 and the rear frame 6 to guide the guide rollers 11. Become.
[0016]
Each of the guide rollers 11 is provided on the back surface 29 of the bucket 9 with a predetermined distance in the width direction, and rotates around an axis (not shown) perpendicular to the back surface 29.
[0017]
As shown in FIGS. 2 and 5, the guide rail 12 is disposed on the front frame 7 and guides the guide roller 11 so that the guide roller 11 is expanded from the inner side in the width direction, and the rear frame 6. And a pair of rear guide rails 14 for guiding the guide roller 11 so as to sandwich the guide roller 11 from the outside in the width direction.
[0018]
As shown in FIGS. 3 and 4, the front guide rail 13 is suspended from the bottom 16 of the front frame 7 via a support body 15 that is pivotable in the width direction. The back side of the running surface 17 is fixed to the lower outside of the support 15.
[0019]
The running surface 17 has a flange 18 that protrudes so as to sandwich the guide roller 11 between the upper end and the lower end, and the travel of the guide roller 11 is guided by the flange 18.
[0020]
The support body 15 is arranged along the front guide rail 13, a rail frame 19 for fixing the front guide rail 13, and a suspension body 20 that suspends the rail frame 19 so as to escape from the guide roller 11. Become.
[0021]
The suspended body 20 is formed by providing an upper plate 22 facing the bottom portion 16 of the front frame 7 at an appropriate interval between a pair of connecting bodies 21 that suspend the rail frame 19 at an appropriate interval. The connecting body 21 has an upper end connected to the bottom 16 of the front frame 7 by a pin 23 and a lower end fixed to the rail frame 19.
[0022]
The upper plate 22 is provided so as to extend from the position near the pin 23 in the escape direction of the front guide rail 13, and is substantially horizontal during normal operation.
[0023]
In the gap 24 formed between the upper plate 22 and the front frame 7, a cushioning material 25 for absorbing the load applied in the relief direction of the front guide rail 13 is provided from the pin 23 to the relief of the front guide rail 13. It is interposed at a position separated in the direction. The buffer material 25 is made of an elastic body such as rubber or urethane rubber.
[0024]
The upper plate 22 and the front frame 7 are penetrated by a plurality of bolts 26 together with the cushioning material 25, and a resilient force is applied to the cushioning material 25 by the tightening force of the head 27 and the nut 28 of the bolt 26. However, the gap 24 is regulated.
[0025]
Next, the operation will be described.
[0026]
When the circulating bucket 9 passes under the front frame 7 and excavates and scrapes a block of transported material, the bucket 9 moves while being supported by a pair of left and right front guide rails 13 inside the two guide rollers 11. To do. At this time, the front guide rail 13 is always urged to the guide roller 11 side by a predetermined elastic force by the buffer material 25 fastened by the bolt 26 and the nut 28, and the gap 24 is spaced from the bolt 26 and the gap 24. Since the position is regulated by the nut 28, the excavation force does not escape the guide roller 11. For this reason, it is possible to prevent the engagement margin between the guide roller 11 and the front guide rail 13 from being reduced, and it is possible to prevent the front guide rail 13 from being worn out at an early stage and an excessive load acting on the shaft of the guide roller 11. .
[0027]
When the bucket 9 moves from below the front frame 7 to below the rear frame 6 while scraping a massive transported object, the guide roller 11 is positioned at the position where the front guide rail 13 and the rear guide rail 14 wrap in the width direction. The outer side in the width direction is supported by the guide rail 14, and it completely transfers to the rear guide rail 14 at a position where the front guide rail 13 disappears. For this reason, the guide roller 11 smoothly transitions from the front guide rail 13 to the rear guide rail 14.
[0028]
Also, when the bucket 9 passes under the rear frame 6, the rear guide rail 14 is always urged toward the guide roller 11 by the cushioning material 25 in the same manner as the front guide rail 13, and the gap 24 is spaced apart. Since it is regulated, it does not escape from the guide roller 11.
[0029]
When a massive transported object is sandwiched between the front guide rail 13 and the guide roller 11, the front guide rail 13 is applied with a force larger than a predetermined resilience force urging the cushioning material 25. The front guide rail 13 quickly deforms the cushioning material 25 to escape from the guide roller 11, and after the guide roller 11 passes, returns to the original predetermined position by the restoring force of the cushioning material 25. For this reason, it is possible to prevent an excessive load from being applied to the front guide rail 13 or the guide roller 11. Further, since the gap 24 in which the cushioning material 25 is arranged is regulated by the bolt 26 and the nut 28, the front guide rail 13 does not return too much when returning to the original predetermined position. The guide rail 13 can be instantaneously returned to the original position.
[0030]
Next, an experiment for confirming the effect of the bucket support device 10 will be described.
[0031]
In the experiment, the bolt 26 is tightened to apply a resilient force to the cushioning material 25 (case 1), and the front guide rail 13 is completely fixed so as not to escape from the guide roller 11 (case 2). In the three cases where the bolt 26 is removed and the elastic force is not applied to the cushioning material 25 (case 3), the size is sequentially changed to the load point A or the load point B shown in FIG. Was measured by measuring the load applied to the front rail at that time.
[0032]
The experimental results are as shown in FIG.
[0033]
When comparing the case 1 and the case 2 when the bulk transported object is bitten at the load point A, the inclination of the load acting on the front guide rail 13 is the same when the biting amount is a or less. From this, it can be seen that the front guide rail 13 of the case 1 does not escape from the guide roller 11 at all at a biting amount a or less. On the other hand, when the biting amount a is exceeded, the inclination of the load acting on the front guide rail 13 becomes gentler and smaller than the case 2. From this, it is understood that the front guide rail 13 escapes from the guide roller 11 and releases the load when the biting amount a is exceeded.
[0034]
In addition, the case 1 and the case 2 when the massive transported object is bitten at the load point B have almost the same results as when the massive transported object is bitten at the load point A. From this, it can be seen that the front guide rail 13 performs the same operation regardless of the biting position.
[0035]
The case 3 has a gentler slope of the load acting on the front guide rail 13 than the case 1 even when the massive transported object is caught at either the load point A or the load point B, and the case 3 acts on the front guide rail 13. The load to be applied is small. For this reason, in the case 3, the front guide rail 13 escapes from a slight biting amount, whereas in the case 1, the front guide rail 13 does not move until the biting amounts a and b are reached. Thus, it can be seen that this is clearly different from the case where no elastic force is applied to the cushioning material 25.
[0036]
The buffer material 25 may use a spring such as a coil spring instead of an elastic body such as rubber or urethane rubber.
[0037]
【The invention's effect】
In short, according to the present invention, it is possible to prevent an excessive load from being applied to the guide rail or the guide roller even if the massive transported object is caught between the guide roller and the guide rail, and in normal excavation, The premature wear of the guide rail can be prevented.
[Brief description of the drawings]
FIG. 1 is a side view of a continuous unloader showing a preferred embodiment of the present invention.
FIG. 2 is a view taken along the line II-II in FIG.
FIG. 3 is an enlarged view of a main part of FIG. 2;
4 is a view taken along the line IV-IV in FIG. 3;
FIG. 5 is a perspective arrangement view showing the arrangement of guide rails.
FIG. 6 is a side view of the bucket support device.
FIG. 7 is a graph showing the results of an experiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Continuous unloader 2 Scraping part 5 Fixing part 9 Bucket 10 Bucket support apparatus 11 Guide roller 12 Guide rail 15 Support body 24 Gap | interval 25 Buffer material 26 Bolt 29 Back surface

Claims (1)

A pair of guide rollers is provided in the width direction on the back side of each bucket to move while supporting the load during excavation of each bucket at the scraping portion of the continuous unloader, and the pair of guide rollers is rolled to In a continuous unloader bucket support device in which a guide rail for holding a bucket is disposed in the scraping portion, a rotatable support body capable of escaping the guide rail in a width direction with respect to the guide roller at a fixing portion of the scraping portion. In the gap formed between the support and the fixed portion, a cushioning material that is supported by the support and constantly biases the guide rail toward the guide roller is provided, and a predetermined elasticity is applied to the cushioning material. bucket supporting device of the continuous unloader, characterized in that it won the gap between the support and the fixing unit regulations in order to urge the.

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