Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
  • B02C17/18—Details
  • B02C17/22—Lining for containers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
  • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
  • B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
  • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
  • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
  • B66F9/061—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks characterised by having a lifting jib

Definitions

• the object of the invention is a conveying device, comprising a movable support frame, a girder, which girder has a first end and a second end and which girder is supported from its first end to the support frame, at least one crane, which crane has a base and a movable boom and which base is supported to the girder, and at least one conveyor supported to the girder, which conveyor has a first end and a second end.
• the object of the invention is a method for conveying objects into a grinding mill. Grinding mills are used, for example, in the mining industry for cracking stone and mineral material from bigger material blocks into smaller fragments.
• the grinding mill typically comprises a cylindrical drum rotatable about a substantially horizontal axis, the diameter of the drum being 2 - 15 m.
• Rock material is fed to the first end of the drum, the so-called forward end, through a feeder funnel.
• the drum ro- tates the blocks of rock hit against each other and the drum walls, as a consequence of which the rock material is ground into smaller blocks. Grinding can be boosted by adding liquid and/or metal spheres into the grinding mill.
• the so-called discharge end there are grate plates provided with apertures of a desired size. Stones ground to a sufficiently small size can exit out from the grinding mill through the grate plates.
• the grate plates at the discharge end of the drum function like a mechanical filter letting stones of a desired size pass through.
• the inner surface of a drum-type grinding mill faces hard mechanical stress and wear because of the hardness of the stone material and the rotating movement of the material.
• the inner surface of the drum of the grinding mill is coated with liner elements, lifters and cover plates, which are made of steel, rubber or a mixture of these.
• the lifters are attached on the periphery of the drum by bolts, and the cover plates are attached between the lifters.
• the mass of one lifter or cover plate element can be from a few tens of kilograms to as much as a couple of tons, so that special devices and support structures have to be used when detaching, installing and attaching them. Because these lining parts wear as the mill is used, they have to be regularly replaced with new ones.
• a conveying device for liner ele- ments of a grinding mill a so-called handler, which is equipped with a support frame with wheels and an elongated beam, which is attached to the support frame from its first end.
• a rotating crane which is provided with a telescopic boom.
• a conveyor which extends from the first end of the beam to the crane. The second end of the beam can be moved into the grinding mill through an aperture at the forward end of the grinding mill so that the crane sets inside the drum and the support frame and the first end of the beam remain outside the drum.
• the new liner elements to be installed are moved within reach of the crane by means of the conveyor, and they are then raised in place onto the wall or ends of the drum by means of the crane.
• the liner elements to be detached from the drum walls are moved out from the drum in a reversed manner.
• a disadvantage of both of these documents is that the boom of the crane has to be rotated in a horizontal plane for a very big rotational angle each time a new liner element is moved from the conveyor to the surface of the mill wall or an old liner element is moved from the wall to the conveyor by the crane.
• the rotational angle of the crane is half a circle at its maximum. Because of the small size of the drum diameter, the length of the crane boom generally has to be altered during the rotation, which further decelerates the movement of the crane boom.
• the "extra" time spent for the movements of the crane boom significantly slows down the replacement work of the liner elements and makes the maintenance break longer, thus causing considerable losses in production.
• the conveying device of the invention has a movable support frame and a girder with a first end and a second end. Due to the movable support frame the conveying device can be moved along a substantially flat bearing base or surface to a desired place.
• the girder is supported to the support frame preferably to a sub- stantially horizontal position.
• there is further at least one crane which has a movable boom and a base supported to the girder.
• a conveyor is supported to the girder, the conveyor having a first end and a second end.
• the conveyor can be of any type suitable for the purpose, such as a belt conveyor, roller track or carriage travelling on rails.
• the crane is supported to the gird- er in a section between the first end and second end of the conveyor.
• the conveyor thus extends along the girder from the first side of the crane to the second side of the crane.
• the second end of the conveyor is located substantially at the second end of the girder.
• the first end of the conveyor is located substantially at the first end of the girder.
• the conveyor extends substantially through the entire length of the girder.
• the length of the girder is adjustable. The length adjustment can be carried out using a telescopic structure for the girder. The possibility to adjust the length of the girder makes it easier to handle the conveying device and increases the options to use it in different localities.
• At the second end of the girder there is preferably at least one supporting element, such as a support leg, for bearing the other end of the girder. Thanks to the supporting element the girder can be supported reliably and immovably in place for the duration of the use of the crane and conveyor.
• the girder has an upper surface, and the conveyor is arranged at least partly above the upper surface of the girder.
• the trajectory of the conveyor travels at least partly above the upper surface of the girder.
• the crane is preferably supported to the girder above the conveyor, and the crane comprises lifting means for raising and supporting the base at a distance from the upper surface of the girder and for lowering it substantially against the upper surface of the girder. In the raised state of the crane there thus remains a slot or gap between the base and conveyor, which makes possible the conveying of objects resting on the conveyor from below the base of the crane from the first side to the second side of the crane.
• the base is pressed as close to the upper surface of the girder as possible, so that the total height of the girder and the crane can be made as small as possible.
• the conveyor can be arranged at least partly below the upper surface of the girder.
• the girder is supported to the support frame in a tiltable manner.
• the girder can be attached to the support frame by an articulated mounting from the vicinity of the first end.
• the tilting of the girder is achieved by lowering or raising the second end of the girder so that the girder rotates slightly around the articulated mounting point.
• the girder is in a substantially horizontal position.
• Yet another advantageous embodiment of the conveying device of the invention comprises two cranes supported to the girder.
• the handling speed of objects can naturally be doubled by using two cranes. This is of benefit in situations in which a large handling speed of objects is required.
• the cranes can be arranged to the girder side by side close to each other so that the working area of the first crane is on the first side of the pair of cranes, and the working area of the second crane is on the second side of the pair of cranes. In this case both cranes can work without disturbing one another.
• Yet another advantageous embodiment of the conveying device of the invention comprises two conveyors supported to the girder.
• the conveyors can work independently from each other or their operation can be synchronised with each other.
• the transport directions of the conveyors can be same or opposed.
• the girder comprises guide elements, such as guide beams, and the crane/cranes is/are movable along the guide elements in the longitudinal direction of the girder.
• the guide elements are preferably arranged to extend from the first end of the girder to the second end, and the cranes are movable past each other along the guide elements.
• objects are moved into the drum of a grinding mill or out from the drum.
• the drum has a discharge end and a forward end.
• a feed orifice At the forward end of the drum there is provided a feed orifice, through which there opens a connection from outside the drum to inside the drum.
• a crane used in the handling of objects is arranged into the drum, a conveyor is arranged to the feed orifice of the drum so that the first end of the conveyor extends outside the drum and the second end of the conveyor extends into the drum, and objects are moved on the conveyor from outside the drum to inside the drum or from inside the drum to outside the drum.
• At least part of the objects is moved on the conveyor into the drum to an area or out from the drum from an area, which is located in a section between the crane and the discharge end of the drum.
• the objects are moved past the crane from below the crane.
• the objects to be moved are liner elements for the drum wall of a grinding mill.
• Figures 1 a, 1 b and 1 c show side views of a conveying device of the invention
• Figure 1 d shows a top view of the conveying device in Figures 1 a-1 c;
• Figure 2a shows an exemplary side view of an advantageous embodiment of a conveying device of the invention
• Figure 2b shows a top view of the advantageous embodiment of the conveying device in Figure 2a;
• Figure 3a shows in an exemplary manner an advantageous embodiment of a conveying device of the invention seen from the side;
• Figure 3b shows a front view of the conveying device in Figure 3a.
• FIG. 1 a there is illustrated in an exemplary manner a conveying device of the invention seen from the side.
• the conveying device is designed to be used especially in the construction and maintenance actions of large grinding mills, in which it can be used for conveying objects, such as liner elements for the drum 100 of a grinding mill into or out from the drum.
• a drum 100 of a grinding mill is depicted in the figure by broken lines for the better illustration of the meaning of the functional parts of the conveying device.
• the conveying device comprises a support frame 10, including a framework consisting of steel pillars 12 and beams 14.
• the support frame is equipped with wheels 16, on which the conveying device can move along a substantially flat bearing base or surface 200.
• the device further includes a motor 18, transmission means for transmitting the force of the motor to the driving wheels, and a steering mechanism for steering the rotating wheels.
• the parts intended for the conveying and steering of the conveying device are of commonly known technology, which is not explained in more detail in this connection.
• an elongated girder 20 which is attached from its first end to the pillars in the first and second edge of the support frame 10.
• the attachment of the girder in the second edge of the support frame to the pillars closer to the drum 100 is carried out with joint pins 22.
• the attachment of the girder to the pillars 12 in the first edge of the support frame is again achieved so that the first end of the girder can be moved slightly in the vertical direction. Because of the articulated mounting and the vertical movement possibility of the first end of the girder, the girder can be tilted into a position deviating from the horizontal position.
• the tilting margin of the girder can be, for example, 5 - 10 degrees to either direction from the horizontal plane.
• the girder 20 is a telescopic beam made of steel, which has a first end section 20a, a second end section 20b, and a middle section 20c.
• the first and second end sections are identical hollow tubular profiles with a rectangular cross-section.
• the middle section 20c is a tubular profile of steel, the cross-sectional form of which is substantially similar, but slightly smaller than the cross-sectional form of the hollow interior of the end sections.
• the middle section is fitted from both ends into the end section so that an elongated girder is formed, the length of which is adjustable in a telescopic manner.
• the lengths of the middle section and end sections can be chosen in the manufacturing stage of the conveying device so that the largest reach of the girder, i.e.
• the distance between the pillars 12 of the second edge of the support frame 10 and the second end of the girder becomes the desired size.
• the largest reach is at least 15 metres.
• conveyor rolls 26 In the upper surface 30 of the tubular profile of the end sections there are conveyor rolls 26 at regular intervals substantially along the entire length of the end sections.
• Around the middle section there is a number of support collars 24, the conveyor rolls 26 being provided in their upper surface.
• the support collars are connected to each other with a chain 28, which is attached from its first end to the first end section 20a and from its second end to the second end section 20b.
• the girder is in its shortest position, in which most of the length of its middle section 20c is inside the end sections 20a, 20b.
• the part of the middle section, which is not inside the end sections, is practically entirely surrounded by the parallel support collars 24.
• a crane 32 including a base 34 and a telescopic boom 36 adjustable in length.
• the boom is attached from its first end to a body 42 on the base in an articulated manner.
• the body is attached to the base in a rotating manner so that the body can be rotated about a vertical axis and locked into any position in relation to the base.
• the angle of tilt of the boom is adjusted by a hydraulic cylinder 48, which attaches from its first end to the body and from its second end to the middle section of the boom 36.
• a grabber 44 for gripping to the objects to be handled with the crane.
• the base 34 of the crane 32 is lowered to its lowest position close to the upper surface of the second end section 20b, and the boom 36 of the crane is turned to a position substantially parallel to the girder 20 so that the free end of the boom points in the direction of the first end of the girder.
• the telescopic girder is set to its shortest position. It is appropriate to place the conveying device to this position when the conveying device is moved outside the grinding mill. For working inside the drum 100 of the grinding mill the conveying device is moved in front of a feed orifice 106 located at the end of the forward end 102 of the drum so that the girder extends through the feed orifice into the drum in the manner shown in Figure 1 a.
• the support legs function as support organs, by means of which the second end of the elongated girder can be supported immovably in place while working with the crane.
• the first ends of the support legs are attached to the side of the second end section with an articulated mounting so that they can be placed to the conveying position according to Figure 1 a, parallel with the girder, and to the support position ac- cording to Figure 1 b, in which the support legs are substantially in a right angle in relation to the longitudinal direction of the girder.
• the length of the support legs is telescopically adjustable.
• FIG 1 b there is illustrated how the conveying device according to Figure 1 a is brought to working readiness inside the drum 100.
• the length of the girder 20 ex- tending into the drum is increased by conveying the second end section 20b so that the free end of the second end section extends close to the discharge end 104.
• the middle section 20c is revealed from the inside of the end sections and the support collars 24 around the middle section are set substantially at equal intervals to the visible length, pulled by the chain 28.
• the conveyor rolls 26 in the upper surface 30 of the end sections and the conveyor rolls 26 in the support collars form a substantially uniform roller track 52 functioning as the conveyor, extending from the first end of the girder to the second end of the girder, i.e.
• the base 34 of the crane 32 is raised by the scissor lift 46 to a distance from the upper surface of the conveyor rolls 26 and locked to the upper position.
• a free space opens below the base of the crane, through which the objects to be moved on the conveyor rolls, such as liner elements for the drum, can move along the conveyor from the first side of the crane to the second side of the crane.
• the support legs 50 at the second end of the second end section are turned to the support position and adjusted to such a length that their free end abuts to the bearing structure or layer.
• the second end of the support leg abuts to the wall of the drum 100. This is possible when the drum is substantially empty. Maintenance work of the drum of a grinding mill, such as replacement of liner elements, can also be conducted when there is a layer of stone material to be crushed at the bottom of the drum. In this case it is natural to support the support legs from their second ends to the stone material layer inside the drum. If the length of the drum is sufficiently small, it is not necessarily required to support the second end of the girder inside the drum, but the girder can function as a protrusion.
• the conveying device illustrated in Figure 1 b is ready to receive and move objects from outside the drum into the drum or from inside the drum out from the drum.
• Figures 1 c and 1 d it is illustrated how the conveying device in Figures 1 a and 1 b is used when working inside the drum 100 for replacing the liner elements 54 of the drum.
• Figure 1 c illustrates the conveying device of the invention seen from the side and Figure 1 d seen from above.
• the drum 100 of the grinding mill is illustrated as a vertical cross-sectional view and in Figure 1 d as a horizontal cross-sectional view. Both figures are next explained simultaneously.
• the new liner elements 54 are moved to the first end of the roller track 50 functioning as the conveyor outside the drum 100.
• the liner elements can be moved to the roller track, for example, by forklifts or lifting devices, which are not shown in the figure.
• the conveyor rolls 26 of the roller track are rotated so that the liner elements move along the roller track through the feed orifice 106 towards the second end of the roller track and girder 20.
• the grabber 44 at the end of the boom 36 of the crane 32 can be used for gripping to the liner elements on the conveyor in a known way and for conveying them to a desired point on the wall of the drum 100 immediately after the liner elements come within reach of the crane boom 36 in the section between the crane and the forward end 102 of the drum.
• the liner elements can also move from below the crane 32, i.e. from between the crane base 34 and the upper surface of the conveyor rolls 26, to the section of the roller track between the crane and the second end of the girder.
• the operator of the crane can thus let the liner elements 54 approaching the discharge end 104 of the drum move to the roller track to a section between the crane and the discharge end of the drum and only after this grasp the liner elements on the roller track with the crane.
• the length of the trajectory of the crane boom from the roller track to the installation point of a liner element on the wall of the drum can thus be minimized.
• the same names and reference numbers are used of these parts in the description.
• the embodiment deviates from the one explained above so that it has two cranes 32 and two conveyors 52.
• the structure and function of the cranes and conveyors is similar to what has been described above, and they are arranged in the same way to the upper surface 30 of the girder 20.
• the cranes are used so that the first crane closer to the discharge end 104 of the drum 100 handles the liner elements 54 to be installed to or removed from the section of the drum between the first crane and the discharge end 104, and the second crane handles the liner elements to be installed to or re- moved from the section between the second crane and the forward end 102 of the crane.
• Both conveyors can transfer liner elements handled by both cranes.
• the first conveyor can be placed to move new liner elements into the drum and the second conveyor to move old liner elements out from the drum.
• Figure 3a there is illustrated in an exemplary manner an advantageous embodiment of the conveying device of the invention seen from the side.
• a carriage 108 equipped with wheels 1 16, a scissor lift 1 17 being supported to its upper surface.
• At the upper end of the scissor lift there is an upper plane constructed by beams 1 14.
• the beams 1 14, the scissor lift 1 17 and the carriage 108 form the support frame 1 10 for the conveying device.
• the girder 120 is supported from its first end to the upper plane of the support frame in a tilting manner, as has been explained above.
• the motor 1 18 of the conveying device is placed inside the carriage.
• the girder consists of three parallel rectilinear support beams 62.
• the support beams are l-profiles of metal, which are attached to each other from their upper flange by means of tie beams 64 so that the beams are placed side by side at a distance from each other.
• the profile of the support beams need not be an I- profile, but a suitable profile shape can be selected according to each case.
• the distance between parallel support beams is dimensioned in accordance with the size of the feed orifice 106 of the drum of the grinding mill so that the girder can be fitted into the feed orifice.
• the distance between parallel support beams can be, for example, 50 - 100 cm.
• the support beams consist in the longitudinal direction of two sections, which are joined with each other from their ends with a bolt mounting 60.
• the longitudinal sections of the support beams are dimensioned according to weight and size so that the sections are movable in a sensible manner.
• the tie beams are tubular profiles, which are found at a distance from each other substantially through the whole length of the girder.
• the distance between parallel tie beams can be, for example, 100 - 200 cm.
• the tie beams are attached to the support beams with a suitable way of mounting, such as a weld mounting or bolt mounting.
• tie beams can also be located in the lower surface of the support beams so that the support beams are supported to each other also from their lower flanges.
• support legs 150 At the second end of the girder there are support legs 150, by means of which the second end of the girder is supported to the wall 100 of the drum close to the discharge end 104. Support legs can also be located in the girder elsewhere than at the end of the girder, such as by the tie beams in the lower surface of the girders.
• the first guide beams 66 extending from the first end of the girder to the second end of the girder 120 are attached to the outermost edge surfaces of the outermost support beams 62 of the girder 120.
• Two parallel second guide beams 68 extending likewise side by side from the first end of the girder to the second end of the girder are attached to the upper surface of the tie beams.
• the guide beams are C-profiles made of metal.
• Both cranes 132a, 132b have a base 134 and supporting arms 70 attached to the base and turning to an angle from the plane of the base.
• At the ends of the supporting arms there are moving wheels 72, which are fitted partly into the guide beams 66, 68 so that they can roll along the surface of the lower flange of the C-profile.
• FIG 3b there is illustrated the conveying device of Figure 3a seen from the end, inside the drum 100 of the grinding mill.
• the second guide beams 68 are arranged side by side at a distance from each other so that the C-profiles open to- wards each other.
• the distance between the second guide beams is dimensioned so that the bases 134 of both cranes 132a, 132b and the moving wheels 72 and supporting arms 70 bearing the base have enough room to pass each other, as the cranes move along the guide beams.
• Each crane can thus move in the longitudinal direction of the girder to a desired point on the girder, irrespective of the location of the second crane.
• the first crane 132a has a one-piece rigid boom 136a, which is attached from its first end to the body 142a of the crane with a pivot mounting.
• the body has a winch 74, on the coil of which there is a wire 76.
• the wire discharging from the coil rotates around a pulley block 80 at the second end of the boom 136a.
• a hook 78a for gripping objects, such as liner el- ements on the wall of the drum.
• the boom 136a of the first crane can be dimensioned so that its length is close to the size of the radius of the drum 100.
• the free end of the boom directed perpendicularly towards the wall of the drum extends then very close to the wall of the drum.
• Such a crane is very well suited for detaching the worn liner elements to be removed from the wall of the drum and for trans- ferring them to a conveyor.
• the second crane 132b has an articulated boom 136b, which is attached from its first end to the body 142b of the crane on the base 134 of the second crane with an articulated fastening.
• the boom can be tilted to a desired angle by a hydraulic cylinder 148.
• a hook 78b for gripping objects, such as liner elements to be installed on the wall of the drum 100.
• a hinge 82 In the section between the first and second end of the boom there is a hinge 82, which divides the boom into two rod-type parts rotating in relation to each other.
• a hydraulic reversing cylinder 84 so that the boom can be made to straighten by increasing the cylinder's length and to bend to an angle at the joint by shortening its length.
• the bending boom 136b provided with a hinge is especially well suited for lifting new liner elements from the conveyor in place to the wall of the drum.
• the bearing rollers 90 are supported from their ends to the support beams by bearings.
• An endless conveyor belt 92 rotates around the bearing rollers.
• the bearing rollers and the conveyor belt belong to a belt conveyor, along which objects, such as liner elements detached from the wall of the drum can be moved from inside the drum to outside the drum.
• the belt conveyor can extend as a uniform device from the first end of the girder to the second end of the girder.
• the belt con- veyor can consist of two or several substantially identical part conveyors, arranged sequentially substantially along the entire length of the girder.
• the belt conveyor or each part conveyor has at least one driving bearing roller, which is rotated by a motor (the motor is not shown in the figure).
• a number of parallel conveyor rollers 126 substantially along the entire length of the girders. These conveyor rollers form a roller track 152, which extends from the first end of the girder to the second end of the girder.
• the roller track functions as the conveyor, along which objects, such as new liner elements can be moved from outside the drum 100 into the drum within reach of the cranes, especially within reach of the boom 136b of the second crane 132b.
• the girder 120 can be placed into a tilting position so that its second end is slightly lower than the first end. In this case the liner elements move along the roller track towards the second end of the girder partly assisted by gravity.
• the cranes 132a, 132b of the advantageous embodiment of the conveying device illustrated in Figures 3a and 3b are remote-controlled devices. Each crane is controlled with a separate control device 96.
• the control commands for the cranes are transmitted from the control device to the cranes via a wireless data transmission connection, such as a radio connection.
• a wireless data transmission connection such as a radio connection.
• the first crane 132a is intended especially for conveying liner elements to be removed from the wall of the drum to the belt conveyor.
• the second crane is intended especially for conveying new liner elements from the roller track 152 to the wall of the drum 100.
• the purposes of use of the cranes have not been restricted in any way, but they can be used for conveying different objects inside the drum in a way seen appropriate by the operator of the crane.
• both the roller track and the belt conveyor can be used both for conveying objects into the drum or out from the drum.
• the mutual distance of the tie beams 64 attached to the upper flanges of the support beams 62 is so big that both conveyors, i.e.
• the upper surfaces of the roller track 152 and the belt conveyor are in practice uncovered, with the exception of the place of the cranes.
• the tie beams do not prevent moving the liner elements to the conveyor or away from the conveyor.
• the distance of the tie beams 64 from the surface of the conveyor belt and the conveyor roller 126 is so big that the liner elements placed to the conveyor have room to travel from below the tie beam in the longitudinal direction of the girder.
• the distance of the tie beam from the surface of the conveyor can be, for example, 50 - 80 cm.
• Objects, such as liner elements can thus be lifted away from the conveyor or lowered to the conveyor at any place of the conveyor so that the length of the trajectory of the crane boom is minimized.
• Objects to be lowered to the section of the conveyor between the second end of the girder and the crane or objects to be lifted from the conveyor in this section move past the crane from below the crane while they are moving on the conveyor.

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• Engineering & Computer Science (AREA)
• Transportation (AREA)
• Structural Engineering (AREA)
• Mechanical Engineering (AREA)
• Food Science & Technology (AREA)
• Civil Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Geology (AREA)
• Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
• Load-Engaging Elements For Cranes (AREA)

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Citations (7)

• 2015
  • 2015-02-27 FI FI20155135A patent/FI127067B/sv not_active IP Right Cessation
• 2016
  • 2016-02-22 SE SE1951025A patent/SE542723C2/en not_active IP Right Cessation
  • 2016-02-22 SE SE1751077A patent/SE542721C2/en not_active IP Right Cessation
  • 2016-02-22 WO PCT/FI2016/050112 patent/WO2016135381A1/en active Application Filing

Patent Citations (7)

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