CZ2007722A3 - Tumbling unit - Google Patents

Abstract

The casting cleaning unit, such as, in particular, the casting unit, the rotating media drum or the sand recovery unit, comprises a cylindrical outer shell, a cylindrical lining disposed in the outer shell, wherein the lining is formed from a series of mutually attached segments (9) wherein the segments (9) have an inner surface (13), an outer surface (15), parallel side edges (17), a leading edge (19) and a rear edge (19) and two parallel vanes (21) projecting from the outer surface (15) ). The side edges (17) of the segment (9) having a groove (25) extending along the side edges (17), the grooves (25) of the adjacent segments (9) defining a channel therebetween. A longitudinal retaining pin (27) inserted into the duct presses adjacent segments (9) apart and thereby forms a tight interlock between the segments (9) in the row of liners.

Description

A casting cleaning unit, such as a casting knocking unit, a rotating media drum, or a sand recovery unit, comprises a cylindrical outer shell, a cylindrical lining disposed in the outer shell, the lining being formed from rows of segments (9) attached to each other. wherein the segments (9) have an inner surface (13), an outer surface (15), parallel side edges (17), a front edge (19) and a rear edge (19), and two parallel vanes (21) projecting from the outer surface (13). 15). The side edges (17) of the segments (9) have a groove (25) formed therein extending along the side edges (17), the grooves (25) of adjacent segments (9) defining a channel therebetween. The longitudinal retaining pin (27) inserted into the channel forces the adjacent segments (9) apart and thereby forms a close mutual attachment between the segments (9) in the row of linings.

2007 - 722 A3

-1 • ·

Casting cleaning unit

Technical field

The present invention relates to a casting cleaning unit, such as a casting knocking unit, a rotating medium drum or a sand recovery unit, and a casting cleaning unit, such as a casting knocking unit, a rotating medium drum or a recovery unit sand having a cylindrical outer shell and a cylindrical lining disposed in the outer shell, and the lining is formed from a series of segments attached to each other.

BACKGROUND OF THE INVENTION

In forming a drum casting treatment plant, such as a casting unit, a rotary separator, a drum using a medium, a material dryer, a regenerating lump crusher, a mixing drum, a sand screen, and the like, it is desirable to form the inner surface of the unit. Thus, when individual segments are worn, they can be easily and quickly replaced without any longer shutdowns or higher costs.

An example of a knocking unit having segmented inner linings is shown in U.S. Patent 3,998,262. As described in this patent, the inner cylinder forming the inner surface of the unit is formed from a series of interconnected modular components. Operation of the unit for its intended purpose has been very satisfactory, but when the molding unit is continuously operated, the wear of the components causes the components or segments to gradually become loose. It requires

retightening the entire formed inner surface. This retightening operation requires the operator to shut down the equipment for a longer period of time.

It is desirable for the unit to operate for a longer period of time before the segments begin to loosen and separate. In U.S. Pat. Nos. 4,502,808, 5,638,887 and 5,638,890, the side edges of the segments are grooved to define a channel between adjacent segments. A pin or rod is inserted into the channel. In the finished lining, the bars tend to push the segments apart, thereby creating a tightness in the finished cylindrical lining. They have also proven good in industrial applications.

Other patents show various similar liner segments.

In U.S. Patent No. 6,273,176, T-shaped pins fit into grooves in the edges of the segments. The pins lock adjacent segments to one another and prevent movement of the segments during wear. As the segment wears, the pins allow the segments to secure the attachment to each other.

In U.S. Patent No. 5,638,890, the lining segment has three vanes on its outer surface and a diagonal blade on its inner surface. The liner segment has cooperating tongues and pockets to connect adjacent liner segments. The three vanes have two outer vanes oriented at an angle. The angle of the outer vanes allows sand, media or waste to be collected where the vanes of adjacent segments meet. A clogged area, full of sand, abrasive media or debris, slows the drum rotation, wears the drum and delays or hinders the flow of other sand, media or dirt. As the outer vanes continue to wear, the segment rotates on the center vane. Sand, medium, or

the impurities act as an abrasive and the blades wear in normal drum operation. For various reasons, it is likely that one outer blade will wear differently than the other outer blade. Changing the depth to the outer vanes allows the segment to rotate or tilt at the edge of the center vane. The segment that tilts causes premature wear to the drum and causes tension in the junction of the tongue and the pocket of the adjacent segments.

Casting knocking units with interlocking liner segments are also disclosed in US Patent Nos. 6,273,176 and 5,638,890 to the same Applicant.

It is therefore an object of the present invention to provide a new and improved casting cleaning unit, such as, in particular, a casting knocking unit, a rotating medium drum or a sand recovery unit.

It is a further object of the present invention to prevent sand accumulation at the point of contact of the two blades and hence blockage points to prevent the outflow of sand or media from the drum.

Another object of the present invention is to prevent crumbling of the lining due to uneven blade wear.

Another object of the present invention is to prevent premature wear of the drum by crumbling the segments.

Another object of the present invention is to increase the amount of sand transported per hour of drum operation by 12% compared to prior art machines.

It is a further object of the present invention to reduce the segment by 5% over existing segments to facilitate drum operation and segment handling during installation, repair weight and replacement.

These and other objects will become more apparent to those of ordinary skill in the art upon becoming familiar with the present invention described below and its preferred embodiment in conjunction with the drawings.

SUMMARY OF THE INVENTION

A casting cleaning unit, such as a casting knocking unit, a rotating medium drum or a sand recovery unit, according to the invention is characterized in that it comprises a cylindrical outer shell, a cylindrical lining placed in the outer shell, the lining being formed from rows of each other the segments attached to each other, the segments having an inner surface, an outer surface, mutually parallel side edges, a front edge and a rear edge, and two parallel vanes projecting from the outer surface, the side edges of the segments having a groove extending therethrough along the side edges; The segments define between each other a channel and a longitudinal retaining pin inserted into the channel, pushing adjacent segments apart and thereby forming a tight mutual attachment between the segments in a row of linings.

In this casting cleaning unit, the segments preferably comprise tongues at the front edges and pads of the rear edges of the segment and cutouts at the corners of the segments, the tongues and cutouts being shaped and positioned to allow the segments to snap together, the pins having cutouts at their opposite ends, wherein the pin cut-outs correspond generally to the cut-out profiles in the segments.

Furthermore, in this casting cleaning unit, the vanes preferably have a constant cross-sectional shape, in particular a rectangular shape.

A casting cleaning unit, such as a casting knocking unit, a rotating media drum, or a sand recovery unit having a cylindrical outer shell and a cylindrical lining disposed in the outer shell and the lining is formed from rows of segments attached to each other, also according to The invention comprises segments having an inner surface, an opposed outer surface, mutually parallel side edges, a leading edge and an opposed rear edge, and two parallel vanes projecting from the outer surface, wherein the vanes are movable in the gap between the outer shell and the lining; formed on one of the side edges extending along the length of the side edges, the grooves of adjacent segments defining a channel therebetween and furthermore longitudinal retaining pins inserted into the channels, pushing adjacent segments apart, thereby forming a tight mutual attachment between segments in the liner row.

The casting cleaning unit further preferably comprises tongues on each of the leading edges and trailing edges, cutouts in the corners of the segments, the tongues and cutouts being shaped and positioned so as to secure adjacent segments and studs having cutouts on their opposite ends, wherein the pin cut-outs generally correspond to the profile cut-outs of the segments.

• • •

In the casting cleaning unit, the vanes preferably have a constant cross-sectional shape, more preferably a rectangular shape.

In a casting cleaning unit, the segments preferably have a generally rectangular shape.

In a preferred embodiment, the segments comprise an outer surface with two vanes, the first vane extending from the center of the side edge towards the rear edge and a second vane parallel to the first vane and spaced from the first vane extending from the front edge towards the edge on the opposite side the first blade and the second blade have a depth with a constant radius that is slightly smaller than the radius of the drum and larger than the radius of the segment. Unlike the vanes, the inner surface has slots, the number of which is greater than that of the previous patents of the same applicant.

BRIEF DESCRIPTION OF THE DRAWINGS

Giant. 1 is a partial perspective view of one end of a cleaning unit, such as a casting unit, shown in a partially exploded view to illustrate one segment of lining removed from the unit.

Giant. 2 is a front view of the segment that forms the lining for the cleaning unit.

Giant. 3 is a top plan view showing the outer surface and the paddles of the segment that push sand along the shaking unit or drum.

Giant. 4 is a plan view from below showing the inner surface of the segment, and FIG. 5 is a plan view from above of the interconnected segments showing how the blades meet.

In the figures, the same reference numerals refer to the same parts.

DETAILED DESCRIPTION OF THE INVENTION

The invention overcomes the limitations of the prior art solutions by providing two vanes of constant cross section in each segment. The following detailed description explains the invention by way of example without limiting it. This description will clearly enable one of ordinary skill in the art to make and use the invention and describes embodiments, modifications, variations, alternatives and uses of the invention, including the embodiment currently believed to be the best embodiment of the invention.

The cleaning unit 7 is shown generally in FIG. 1. The cleaning unit 1 is preferably a unit designed and operated

in a way that is described in U.S. Pat 998 262. Serving to remove sand from casting that se odl it turns over. As shown, j ednotka 1 in general contain e outer cylinder 3 or drum and inner cylinder 5. Internal cylinder 5 has a smaller diameter than the outer cylinder 3 and both of them ce 3, 5 define the space 7 between cylinder 3, 5.

The inner lining of the inner cylinder 5 is made of interlocking segments 9 which interlock to form the inner cylinder 5. The segments 9 cooperate with the outer cylinder.

the drum 3 or drum so as to move the sand along the outer drum 3 or drum towards the outlet. Importantly, the segments 9 are locked together so that the segments 9 do not fall out of the lining when worn. This advantageously extends the time during which the unit 1 can be operated continuously before it has to be shut down to tighten the lining forming the inner cylinder. The segments 9 are preferably rectangular in shape and curved along their longitudinal axis. The segments 9 may alternatively have hexagonal α

three longitudinal longitudinal axes. shapes and also can be curved along its Segment 9 is similar to segments described in the patent U.S. 5,638,890. Each segment 9 generally has arcuate body 11 having internal surface 13, outer surface 15, side edges 17 and front and back margins 19. Each segment p advantageously covers the arch

an angle of about 20 ° to about 45 °. To form the spacing of the segments 9 and hence of the inner cylinder 5 from the outer cylinder 3, each segment 9 has diagonally extending grooves or vanes 21 on its outer surface 15. The vanes 21 are positioned on the segment 9 such that when the segments 9 are joined to form the inner cylinder 5, the blades 21 from one segment 9 contact respective blades 21 from adjacent segments 9 so as to form a continuous flute that acts as a spiral worm formed on the outer surface 15 of the segments 9 and within the outer cylinder 13, i.e. drum. Compared to previous known patents, the inner cylinder 5 is improved in that it is preferably more perforated so that sand which separates from the castings can fall into the space 7 between the inner cylinder 5 and the outer cylinder 3. As the outer cylinder 3, or drum rotates the troughs or vanes 21 with sand, medium or debris moving toward the exit of the outer cylinder 3, or drum. Thus, the segments 9 have a plurality of holes or perforations 23 formed therein that allow sand or dirt to fall into the space 7 between the inner.

The perforations 23 have a somewhat rectangular shape with rounded ends. A slot or groove 25 is provided along the side edges 17 for locating the pin 27, which creates the spacing of the segments 9 in the complete inner cylinder and tightens the fastening between the segments 9 of the inner cylinder 5. The pin 27 is described in U.S. Patent 5,638,890. located along the entire length of the side edges 17.

To allow the individual segments 9 to be secured together and locked together, each segment includes a tongue 29 that extends from the approximate center of the leading edge 19 and the trailing edge 19, and generally rectangular slots 31 at the four corners of the lining body 11. In the formed pocket 33 a tongue 29 of another segment 9 is placed, which is located next to two segments along the leading edge 19 and the trailing edge 19 of the segments, as shown in FIG. 5. However, the body has a raised portion 35 on the outer surface 15. 4. The pockets 33 are therefore closed on one side. When the lining forming the inner cylinder 5 is assembled, the raised regions 35 forming the cover rest on the tongues 29, thereby locking the segments 9 of adjacent different rows of segments 9.

As shown in FIGS. 2 and 4, the segments 9 have grooves on their inner surfaces 13. The sand and castings move through the inner cylinder 5 while the drum is rotating and tilting, in the form of the outer cylinder 5. When the segments 9 are interconnected, the pins 27 seal the liner or inner cylinder 5 as described in U.S. Patent 4,502,808; to prolong the time until the segments 9 are released from each other due to the continuous operation of the drum-containing unit. The interconnection of the segments 9 in turn prevents the segments 9 from falling out when the pin 27 is worn.

• 44 · 4

Thus, when the pin 27 is worn, the interaction of the tongue 2 and its associated pockets 33 will prevent the segment 9 from falling out of the inner cylinder 5. Even if the segment 9 is released when wear occurs throughout the entire pin 27, the segment 9 does not fall out. This will give the operator time to normally shut down the unit £ and insert a new pin 27 or a new segment 9.

Advantageously, the segments 9 according to the present invention will cooperate with each other to prevent the segment 9 from separating from the lining that forms the inner cylinder 5 when the pin 27 is worn or broken. Although the segment 9 may be somewhat loose, the unit 9 will still be operable, at least for a short period of time, before the segment 9 has to be replaced. This will allow a normal machine shutdown instead of a sudden or emergency machine shutdown that would be required if the segment 9 separated from the lining forming the inner cylinder 5. The pin 27 will provide a smooth and continuous transition between the segments 9 so that the castings and sand move only continuously. a substantially uninterrupted inner surface for the lining and continuous, substantially uninterrupted vanes 21 or helical flutes along the outer surface of the lining.

The lining for shaking castings and recovering sand has been described above. This liner is uniquely capable of reducing the occurrence of clogging sites with sand, media or dirt and low capacity between liner and drum. The lining and its various parts can be made of many materials, especially ferrous and non-ferrous metals, their alloys, polymers, high density polyethylene, polypropylene, nylon and composites.

• ·

Those skilled in the art will contemplate changes or modifications to the invention as described herein. It is intended that such changes, when within the scope of this solution, be included in the principle of the invention as explained herein. The description of the preferred embodiment and its illustration given in the drawings serve only for the purpose of illustration.

Industrial applicability

Such units are used to separate or remove sand from castings in a foundry, casting treatment plant or other plant.

• · · · · · · · · · · · · · · · · · ·

PATENT CLAIMS

Claims (9)

A casting cleaning unit, in particular a casting knocking unit, a rotating medium drum or a sand recovery unit, characterized in that it comprises: a cylindrical outer shell, a cylindrical lining disposed in the outer shell, the lining being formed from a series of segments (9) attached to each other, the segments (9) having an inner surface (13), an outer surface (15), parallel side edges (17) ), a front edge (19) and a rear edge (19) and two parallel vanes (21) projecting from the outer surface (15), the side edges (17) of the segments (9) having a groove (25) extending along the side edges (17), wherein the grooves (25) of adjacent segments (9) define a channel and a longitudinal retaining pin (27) interposed in the channel, pushing adjacent segments (9) apart, thereby forming a tight mutual attachment between the segments (9) in the row of lining. Casting cleaning unit according to claim 1, characterized in that the lining segments (9) comprise tongues (29) at the front edges (19) and rear edges (19) of the segment (9) and slots (31) in the corners of the segments, wherein the tongues (29) and the slots (31) are shaped and positioned to allow the segments (9) to snap together, the pins (27) having slits at their opposite ends, the slits of the pins generally corresponding to the profile of the slits (31) in segments (9). Casting cleaning unit according to claim 1, characterized in that the vanes (21) have a constant cross-sectional shape. Casting cleaning unit according to claim 3, characterized in that the vanes (21) have a rectangular shape in cross-section. 5. A casting cleaning unit, such as a casting knocking unit, a rotating media drum, or a sand recovery unit having a cylindrical outer shell and a cylindrical lining disposed in the outer shell and the lining being formed from rows of segments attached to each other ( (9), characterized in that: the segments (9) have an inner surface (13), an opposed outer surface (15), mutually parallel side edges (17), a front edge (19) and an opposite rear edge (19), and two parallel vanes (21) projecting from the outer surface ( 15), wherein the vanes are movable in the gap between the outer shell and the lining, two grooves (25) each formed at one of the side edges (17) extending along the length of the side edges (17), the grooves (25) of adjacent segments (9). ) define between themselves a channel and longitudinal retaining pins (27) inserted into the channels, pushing adjacent segments (9) apart, thereby forming a tight mutual attachment between the segments (9) in the row of liner. A casting cleaning unit according to claim 5, further comprising: ··· ····························································· Tongues (29) on each of the front edges (19) and rear edges (19), cut-outs (31) in the corners of the segments (9), wherein the tongues (29) and the slots (31) are shaped and positioned to attach segments (9) adjacent to each other and pins (27) having slits at opposite ends thereof, the slits of the pins (27) generally corresponding to the profile of the slits (31) of the segments (9). A casting cleaning unit according to claim 5, characterized in that the vanes (21) have a constant cross-sectional shape. Casting cleaning unit according to claim 7, characterized in that the vanes (21) have a rectangular shape in cross-section. Casting cleaning unit according to claim 5, characterized in that the segments (9) are generally rectangular in shape. 99 99 99 99 9 9 9 9 9 · GIANT. 1