EP3850162A1 - Excavating finger and associated excavating bucket - Google Patents
Excavating finger and associated excavating bucketInfo
- Publication number
- EP3850162A1 EP3850162A1 EP20800773.2A EP20800773A EP3850162A1 EP 3850162 A1 EP3850162 A1 EP 3850162A1 EP 20800773 A EP20800773 A EP 20800773A EP 3850162 A1 EP3850162 A1 EP 3850162A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- finger
- shovel
- excavation
- digging
- cylindrical housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000014759 maintenance of location Effects 0.000 claims abstract description 7
- 238000009412 basement excavation Methods 0.000 claims description 60
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 2
- 239000010962 carbon steel Substances 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 230000003100 immobilizing effect Effects 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 description 10
- 238000012216 screening Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 210000000078 claw Anatomy 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
- E02F9/2808—Teeth
- E02F9/2816—Mountings therefor
- E02F9/2833—Retaining means, e.g. pins
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
- E02F9/2808—Teeth
- E02F9/285—Teeth characterised by the material used
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B27/00—Placing, renewing, working, cleaning, or taking-up the ballast, with or without concurrent work on the track; Devices therefor; Packing sleepers
- E01B27/04—Removing the ballast; Machines therefor, whether or not additionally adapted for taking-up ballast
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B27/00—Placing, renewing, working, cleaning, or taking-up the ballast, with or without concurrent work on the track; Devices therefor; Packing sleepers
- E01B27/06—Renewing or cleaning the ballast in situ, with or without concurrent work on the track
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
- E02F9/2808—Teeth
- E02F9/2858—Teeth characterised by shape
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
- E02F9/2866—Small metalwork for digging elements, e.g. teeth scraper bits for rotating digging elements
Definitions
- the invention relates, in general, to the technical field of excavators intended to equip, in particular, clearing or excavation chains.
- the invention relates more specifically to an excavation finger, or claw, of a shovel intended to equip an excavation chain for a ballast excavator below a railway track
- ballasts located under the sleepers of a railway track, and for sorting it for possible reuse by dumping it on the track.
- These machines are commonly called “stripping machines”.
- work trains generally further comprise a machine responsible for screening the ballast to keep, on the one hand, the healthy part of the ballast for its reuse, and on the other hand, to remove the worn part of the ballast in wagons provided for this purpose.
- the stripper-screening machine makes it possible to remove, sort the used ballast and replace the entire ballast layer with the sorted healthy ballast as well as a possible additional supply of new ballast.
- Such work trains are equipped with excavation chains consisting of a succession of articulated links, at least part of which is equipped with shovels intended to excavate the ballast.
- This chain is arranged in a movable or adjustable manner in height, on the chassis of the rail vehicle.
- the chain is endlessly moved by a driving mechanism.
- the chain path is configured so that it has a rectilinear excavation portion located under the railway sleepers, the chain working on this excavation portion transversely to the orientation of the rails of the railway track. by dragging and transporting the ballast with them.
- excavation brackets are arranged forming return members for the excavation chain.
- brackets are located at the ends of the rectilinear excavation portion, the portion along which the ballast is withdrawn, and are generally formed of a fixed bent wall on which the chain links slide successively.
- the chain circulates along a longitudinal arrival path then circulates on the rectilinear excavation portion after having passed through a first bent portion formed by one of the brackets.
- the chain which continues on its way then leaves said rectilinear excavation portion to circulate on the longitudinal outlet portion after having passed through a second bent portion formed by the other of the brackets.
- the shovels arrive on this rectilinear excavation portion while being unloaded and come out loaded with ballast towards the longitudinal exit portion.
- the longitudinal inlet and outlet portions are connected, in an area located high above the rail vehicle, by a transverse discharge portion where the ballast is discharged onto conveyor belts.
- the shovels unloaded from the ballast then continue their way towards the arrival longitudinal portion, then repeating these operations.
- the invention aims to remedy all or part of the drawbacks of the state of the art by proposing in particular a reinforcing finger and an associated excavating shovel which allow a reduction in the wear of the reinforcing fingers so to be able to reduce maintenance operations aimed at replacing these consumable parts.
- an excavating finger of a shovel intended to equip an excavation chain for a ballast excavating device below a track shod, the finger being in one piece and comprising: a holding portion having a symmetry of revolution about a reference axis of the finger, the holding portion being intended to be housed in a cylindrical housing of the shovel, and a point intended for be protruding out of the cylindrical housing of the shovel, the excavation finger being remarkable in that the holding portion comprises at least one annular groove configured to receive at least part of a locking rod, intended to ensure a hold axial of the holding portion in the cylindrical housing so that the finger is free to rotate around its reference axis.
- the finger is configured so as not to be blocked in rotation, which allows regular wear of the latter. In this way, the maintenance for the replacement of the fingers is less frequent due to reduced wear.
- the holding portion comprises a plurality of annular grooves, the annular grooves being mutually parallel and distant from each other. In this way, the excavation finger can receive a locking rod in one or the other of its annular grooves, corresponding to different axial positions of the excavation finger.
- the annular grooves therefore make it possible to index the finger in a corresponding position, depending on the wear of said excavation finger. Such a feature allows prolonged use of the finger and therefore to reduce the maintenance consisting in replacing a finger on the one hand, and to limit the costs associated therewith.
- the finger has symmetry of revolution about the reference axis.
- the digging finger is preferably formed of steel.
- the finger comprises, at least at the level of the tip, a reinforcement made of a cutting material, in particular of carbon steel, of tungsten steel or of carbide.
- the finger can be entirely formed by this reinforced material.
- a part of the finger comprising the tip is made of this reinforced material forming a reinforcement, such as carbide, then assembled with a second part formed for example of steel, this assembly preferably being carried out by sintering and / or brazing. In this way, the structure of the resulting digging finger is perfectly resistant.
- the annular groove has in section in a plane containing the reference axis a profile in the form of an arc of a circle.
- the profile of the annular groove is configured to at least locally match the shape of a zone of the locking rod that it receives.
- the invention also relates to an excavator intended to equip an excavation chain for a ballast excavating device below a railway track, the excavator comprising: a body comprising at least one cylindrical housing defining an insertion axis, and a fixing hole having an axis extending in a plane perpendicular to the insertion axis, at a distance from the insertion axis, the fixing hole opening into the cylindrical housing; at least one digging finger as described above, the holding portion of which is housed in the cylindrical housing, and the tip protrudes from the body of the shovel, a locking rod which penetrates into the fixing hole and in the groove of the finger to hold the finger axially on the shovel, the excavation finger being free to rotate around its reference axis.
- the shovel comprises a plurality of cylindrical housings each intended to receive an excavation finger.
- the shovel is better protected by the digging fingers.
- the shovel includes at least three digging fingers.
- each housing is positioned on a rear part of the shovel so that the associated digging finger extends in an extension of the shovel.
- the digging fingers are preferably positioned protruding from an outer edge of the shovel.
- the locking rods comprise a screw, the fixing hole or a separate member having a threaded portion so as to receive the screw.
- FIG. 1 a simplified side diagram of a work train equipped with a stripper-screen according to one embodiment
- FIG. 2 a partial diagram of an excavation or clearing device according to this embodiment, seen from the front without an excavation chain;
- FIG. 3 a view of a link of an excavation chain carrying a shovel provided with excavation fingers according to one embodiment
- FIG. 4A a view of an excavation finger according to the embodiment of Figure 3;
- FIG. 4B a view of an excavation finger according to another embodiment
- FIG. 5 a top view of a succession of links intended to equip an excavation chain including a link carrying a shovel provided with excavation fingers according to the same embodiment as those illustrated in Figures 3 and 4;
- FIG. 6 a front view of FIG. 5;
- FIG. 7 a rear view of a link of an excavation chain carrying a shovel provided with digging fingers according to one embodiment
- FIG. 8 a sectional view A-A of FIG. 7;
- FIG. 9 a section view B-B of Figure 8.
- FIG. 1 there is illustrated a railway vehicle 1 such as a stripper-screen equipped with a clearing or excavation device 4 for clean the ballast of a 2 railway track.
- This clearing or excavation device 4 is arranged between two bogies 3 of train 1.
- the ballast clearing device 4 comprises an excavation chain 8 moved endlessly by a drive mechanism 9 and guided by ducts including a transverse duct 5 located under the track 2 in the working position , along which the chain runs on a substantially rectilinear excavation portion 8A.
- the clearing device 4 also comprises upward and downward ducts 6, 7 connected on either side of the transverse duct 5 to which they are connected by bent portions forming angle references 40 also called “brackets" (see figure 2). It is understood that the excavation portion is generally rectilinear, even though the excavation is provided in a part of the curve of each of the bevel gearboxes.
- the drive device 9 is arranged in height with respect to the railway vehicle 1, above the railway track 2, on a side longitudinally opposite to the transverse duct 5, and between the ascending duct 6 and the duct descent 7.
- the drive device 9 is placed on the path of the excavation chain 8 and comprises a drive wheel 9 'locally engraining with links 100 of the excavation chain 8 so as to move it.
- An endless path is thus formed to guide the excavation chain 8.
- Arrows illustrated in FIG. 2 indicate the direction of movement of the chain 8.
- idle wheels forming return members 40 are provided to ensure correct movement of chain 8 at these bent areas.
- ballast Once the ballast has been transported high in the riser pipe 6, it is unloaded on a conveyor belt 10 and then transported to a screening unit 11 in order to sort the healthy ballast from the used ballast.
- the vehicle 1 further comprises a lifting unit 13 of the railway track 2 which is connected to a frame 14 of the vehicle 1 and which is located upstream of the device 4 for clearing or excavating with respect to a direction of work 12 of the vehicle 1.
- a height adjustment device 16 is also provided and connected to the frame 14 of the vehicle 1, which is configured to move the clearing device 4, by drive means 15, from a raised position to a lowered position under the railway track 2 and which can be connected, for example, in a removable manner to the transverse duct 5 by a connector (not visible in the figures).
- FIG. 3 illustrates a perspective view, from the back, of an example of a link 100 intended to compose the excavation chain 8.
- the excavation chain 8 is formed by a succession of links 100 articulated in pairs until the two ends of the chain 8 are connected end to end to form a closed chain 8, endless chain type.
- Some of the links 100 of chain 8, like the one shown in Figure 3, have a shovel 130 allowing ballast to be carried along the path it travels.
- Each of the links 100 comprises a body 101 which extends longitudinally between a front end 110 and a rear end 120 provided respectively with at least one front hole 111 and a rear hole 121 passing right through the link 100 and configured to receive articulation means 160 with an adjacent link of the chain 8.
- the longitudinal direction is understood here as the direction of movement of the link 100.
- the front 111 and rear 121 through-holes extend along axes parallel to each other and contained in a reference plane P of the body 101.
- the link 100 illustrated in Figure 3 comprises a protruding portion formed by a shovel 130 extending from an outer side 100A of the body 101 of the link 100 relative to the reference plane P, opposite to the inner side 100B of the body 8 of link 100, the inner side having a surface configured to come into contact with the return members 40 of the clearing device 4 during the movement of the chain 8.
- the shovel 130 comprises a form of pallet having a working face oriented to the front, that is to say which is oriented in the direction of the direction of advance of the chain 8 and a back oriented to the back.
- the shovel 130 extends from the body 101 of the link 100 to an outer end 130a which extends generally along an axis parallel to the reference plane and parallel to the axes of the front 111 and rear 121 through holes, and has two side edges, lower 130b and upper 130c.
- the shovel 130 further comprises digging fingers 132 projecting outwardly from the exterior side 100A relative to the reference plane P, in the extension of the shovel 130.
- these fingers 132 are three in number: a central finger, a lower finger and an upper finger protruding from the outer side 130a of the shovel 130.
- each finger 132 has a cylindrical body provided with at least one holding portion 132b configured to be housed in a corresponding cylindrical housing 134 provided for this purpose.
- Each finger 132 further comprises a tip 132a intended to project out of the cylindrical housing 134 of the shovel 130.
- the points 132a of each finger 132 are disposed projecting from the outer edge 130a of the shovel 130 in the extension of the shovel 130.
- Such a projection allows each finger 132 to excavate to undergo a large part of the frictional stresses in place of the edge 130a of the shovel 130 from which said excavation finger 132 protrudes. In this way the corresponding edge 130a of the shovel 130 sees its wear greatly reduced.
- the holding portion 132b has a symmetry of revolution about a reference axis X of the finger 132 and comprises a body extending along a cylindrical envelope.
- the finger 132 as a whole exhibits a symmetry of revolution about the reference axis X.
- Such a cylindrical envelope allows the finger 132 to translate in the associated cylindrical housing 134.
- This cylindrical envelope of the body of the finger 132 is dimensioned to be substantially complementary to the cylindrical housing 134 so that the body of the finger 132 can be guided in its translation by the cylindrical housing 134 itself. To do this, an external diameter of the body of the finger 132 is slightly less than an internal diameter of the cylindrical housing 134 of the shovel 130.
- each finger 132 is located in the axial extension of the body of the associated finger. Furthermore, the points 132a of each finger 132 are here contained radially inside the cylindrical envelope of the associated finger 132, that is to say that the points 132a of a finger do not project radially from its body. In other words, at any point of the point 132a of one of the fingers, a diameter taken at the level of this point is less, preferably strictly less, than the external diameter of the body of the associated finger 132.
- the holding portion 132b further comprises at least one annular groove 132c configured to receive at least part of a locking rod 135, intended to ensure axial retention of the holding portion 132b in the cylindrical housing 134 of so that the finger 132 is free to rotate about its reference axis X. In this way, the locking in translation of the finger 132 is ensured and leaves the finger 132 free to rotate when it is fixed to the shovel 130.
- the rod locking 135 is removably fixed relative to the shovel 130 so as to be able to change the finger 132 in the event of excessive wear.
- Such fingers 132 are designed in a very strong manner, for example made of high strength steel, the maintenance of which is easier than the link 100 of the chain 8 itself and which makes it possible to adapt more precisely to localized wear as a function of the forces undergone. This allows a reduction in the cost of maintenance and a shorter maintenance time, and therefore shorter machine downtime.
- the shovel 130 comprises a body 131 comprising a plurality of cylindrical housings 134, three here, each defining an insertion axis W.
- the shovel 130 is provided at each level.
- cylindrical housing 134 a fixing hole 136 having an axis W 'extending in a plane perpendicular to the corresponding insertion axis W and at a distance from the corresponding insertion axis W, the fixing hole 136 opening into the cylindrical housing 134 so that the locking rod 135 which enters the fixing hole 136, also partially penetrates the groove 132c of the finger 132 to axially hold the finger 132 on the shovel 130 while leaving the finger 132 excavation free in rotation around its reference axis X.
- the locking rod 135 comes in the vicinity of a bottom of the annular groove 132c associated tangentially with this annular surface. In this way, the locking rod 135 does not obstruct the rotation of the finger 132 around itself, that is to say around its reference axis X, which coincides with the insertion axis W.
- the locking rod 135 is not in contact with the bottom of the annular groove 132c. However, it can be but the support of the locking rod against the annular groove 132c must be relatively low in order to limit the friction between the locking rod 135 and the annular groove 132c do not create a hindrance for the free rotation of the finger. 132.
- the locking rod 135 has been shown centered on the axis W 'of the fixing hole 136, so that interference appears between the locking rod 135 and the bottom of the groove 132c. which does not exist in reality, because of the functional games. In this case, it is ensured, taking into account the manufacturing tolerances, that there is always a functional clearance between the locking rod 135 and the bottom of the groove 132c, which gives the finger 132 of excavation its freedom of rotation around its reference axis X.
- Each finger 132 is here kept fixed in translation in the cylindrical housing 134 associated by a single locking rod 135.
- the locking rods 135 comprise for each finger 132 a screw provided with a head 135b at a first end and a distal end 135a, opposite its head 135b and having a threaded portion 135c.
- the head 135b comes into contact with and bears against a periphery of an inlet of the fixing hole 136, the threaded portion 135c being anchored with a nut 135 'provided with a threaded hole cooperating with the thread of the threaded portion 135c of the locking rod 135.
- a washer 135 is interposed between, on the one hand, a periphery of an outlet of the fixing hole 136 against which it is in contact and resting against and, on the other hand , the nut 135 '.
- the nut 135' carrying the threaded hole is here an added part but it is understood that other fasteners can be used.
- the fastening hole 136 can for example comprise a cylindrical insert provided with 'a threaded internal hole.
- the fixing hole 136 can also be machined to carry a thread.
- the locking rod 135 may also be of different nature, and may include any suitable locking means such as for example a locked pin with a pin. However, a screw is t easier to change.
- the digging fingers 132 are removably fixed relative to the shovel 130, the removal of the locking rod 135, for example by unscrewing it, allows the finger 132 concerned to be released and to be removed from its housing cylindrical 134 by translating it, or else simply moving it axially to index it at the level of another annular groove 132c.
- the locking rod 135 preferably comprises a cylindrical or annular body and the groove 132c presents in section in a plane containing the reference axis X an arcuate profile.
- This shape is configured to locally match the shape of the fixing rod 135 so as to minimize the play between said fixing rod 135 and the associated digging finger 132.
- the depth of the groove 132c in a holding portion 132b is greater than 10%, preferably greater than 40% and less than 60%, preferably less than 50% of a radius of the associated excavation finger 132.
- the annular groove 132c must be deep enough to ensure its axial locking and sufficiently weak not to weaken the structural integrity of the excavation finger 132.
- the depth of the groove 132c in a holding portion 132b is dimensioned so as to correspond to 50% of a radius of the associated digging finger 132.
- the axis W 'fixing hole 136 extends in a plane perpendicular to the corresponding insertion axis W and at a distance d from the insertion axis W equal to approximately the radius of the fixing hole. 136. This corresponds to a good ratio between the effectiveness of maintaining the finger 132 and limiting the fragility of said finger 132 due to the presence of the annular groove.
- the housings 134 are positioned on a rear part of the shovel 130 so that the associated excavation finger 132 extends outwardly of the shovel 130, in an extension of said shovel 130.
- the front part, or front working face, opposite to the rear part of the excavator 130 is configured so as to present a useful surface for the excavation of the ballast.
- the locking rod 135 is oriented so that its head is in contact and resting on a part of the front part of the shovel 130 while the nut 135 'is in abutment, indirectly due to the washer 135 ", against a rear face of said shovel 130.
- the front part of the shovel 130 has a recess 137 inside which can be housed in all or part of the head 135b of the locking rod 135 so as to limit wear (see for example FIG. 8).
- annular grooves 132c are mutually parallel and distant from each other by so as not to overlap.
- An overlap would be such as to reduce the effectiveness of the axial locking of the finger 132.
- Such a plurality of annular grooves 132c allows the finger 132 to be adjusted in translation and thus to cause it to translate in its cylindrical housing 134 in order to place one of the following annular grooves 132c engage with the locking rod 135 and thus take predetermined positions according to its wear.
- the distance between two annular grooves 132c may vary depending on the material of the finger 132 and the rate of wear relative to the ballast being transported.
- the annular grooves 132c are spaced therebetween by a distance corresponding at least to the axial width of the annular grooves 132c, preferably between one and two times the axial width of the annular grooves 132c. All or part of the annular grooves 132c, preferably all of the annular grooves, have an identical diameter around the cylindrical body of the associated finger 132.
- the fingers 132 are each oriented along an axis inclined relative to the reference plane P, with an inclination ⁇ of between 65 and 80 °, preferably between 70 and 75 °.
- the fingers 132 are also oriented in a plane P132 inclined relative to a mean plane P130 of the shovel 130 extending substantially vertically (see Figure 8), the inclination ⁇ preferably being between 20 and 35 ° , and here equal to about 30 ° in this embodiment.
- the useful working surface of the shovel 130 is understood here as the surface swept by the shovel 130 during its movement.
- the fingers 132 are all located above a Pinf plane perpendicular to the parallel axes of the front 111 and rear 121 through holes and tangent to a lower end of said shovel 130, in particular in this embodiment, also in below a Psup plane tangent to an upper end of the excavator 130 (see Figure 7).
- the planes Pinf and Psup are generally horizontal. This lower end is sensitive in that it is extremely stressed in terms of abrasion wear against the ballast so that if the wear becomes too great, it can interfere with the proper attachment of the fingers 132 on the back of the machine. the shovel 130.
- the hardness of the lower surface of the shovel 130 is increased, for example by an addition by welding chromium / manganese and vanadium or by adding tungsten carbide plates.
- the shovel 130 further has an abutment surface 138 located on the back of the shovel 130, between the body 101 of the link and the cylindrical housings 134, the abutment surface 138 being configured to receive a counter-stop 140 of a rear adjacent link of the chain 8 so as to limit a relative rotation between the chain link 100 8 and the rear adjacent link around the axis of the rear through-hole 121.
- a stop position of the shovel 130 against the counter -stop 140 of the associated rear link 100 is visible in Figure 5.
- the shovels 130 undergo a force by driving the ballast which generates a moment on the shovel 130 which has tendency to tilt the link 100 backwards, this tilting being a pivoting of the shovel 130 about the axis of the rear through hole 121 configured to receive articulation means 160.
Landscapes
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Machines For Laying And Maintaining Railways (AREA)
- Earth Drilling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1911425A FR3101893B1 (en) | 2019-10-14 | 2019-10-14 | Excavation finger and associated excavation shovel |
PCT/EP2020/078956 WO2021074250A1 (en) | 2019-10-14 | 2020-10-14 | Excavating finger and associated excavating bucket |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3850162A1 true EP3850162A1 (en) | 2021-07-21 |
EP3850162B1 EP3850162B1 (en) | 2022-06-29 |
Family
ID=69630393
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20800773.2A Active EP3850162B1 (en) | 2019-10-14 | 2020-10-14 | Excavating finger and associated excavating bucket |
Country Status (8)
Country | Link |
---|---|
US (1) | US20240102267A1 (en) |
EP (1) | EP3850162B1 (en) |
CN (1) | CN114585785A (en) |
AU (1) | AU2020365389A1 (en) |
BR (1) | BR112022006950A2 (en) |
CA (1) | CA3153798A1 (en) |
FR (1) | FR3101893B1 (en) |
WO (1) | WO2021074250A1 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT349051B (en) * | 1977-06-01 | 1979-03-26 | Plasser Bahnbaumasch Franz | SPACING CHAINS AND CONVEYOR CHAINS, IN PARTICULAR FOR TRACK-BED CLEANING MACHINES |
US5810102A (en) * | 1996-08-23 | 1998-09-22 | Stewart; Gary L. | Reversible bit assembly |
US20050127742A1 (en) * | 2003-12-11 | 2005-06-16 | River City Manufacturing Inc. | Retaining system for securing a cutting tool to a support block |
CN102839976B (en) * | 2008-01-08 | 2015-09-30 | 爱斯科公司 | Wear-resisting cap and wear-resisting cap and base assembly |
US20180156036A1 (en) * | 2016-12-07 | 2018-06-07 | Alliance Coal, Llc | Double headed drill bit for a continuous coal mining machine |
-
2019
- 2019-10-14 FR FR1911425A patent/FR3101893B1/en not_active Expired - Fee Related
-
2020
- 2020-10-14 US US17/754,804 patent/US20240102267A1/en active Pending
- 2020-10-14 AU AU2020365389A patent/AU2020365389A1/en active Pending
- 2020-10-14 EP EP20800773.2A patent/EP3850162B1/en active Active
- 2020-10-14 WO PCT/EP2020/078956 patent/WO2021074250A1/en active Application Filing
- 2020-10-14 CA CA3153798A patent/CA3153798A1/en not_active Abandoned
- 2020-10-14 CN CN202080072109.XA patent/CN114585785A/en active Pending
- 2020-10-14 BR BR112022006950A patent/BR112022006950A2/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
CN114585785A (en) | 2022-06-03 |
CA3153798A1 (en) | 2021-04-22 |
US20240102267A1 (en) | 2024-03-28 |
WO2021074250A1 (en) | 2021-04-22 |
BR112022006950A2 (en) | 2022-07-19 |
FR3101893B1 (en) | 2022-07-22 |
AU2020365389A1 (en) | 2022-04-28 |
EP3850162B1 (en) | 2022-06-29 |
FR3101893A1 (en) | 2021-04-16 |
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