Apparatus for transporting object

Abstract

The present invention provides a conveying device comprising: a container portion having a space for receiving a molten material and having an opening at the top; a cover portion installed on the container portion so as to be unfolded along the top of the container portion to cover the opening; a drive portion installed on the container portion and connected to the cover portion so as to transmit the movement of a carrier to the cover portion to unfold the cover portion; and a locking portion installed on the container portion so as to be coupled with the drive portion to fix the movement of the drive portion in order to maintain the cover portion at the unfolded position on the top of the container portion, thereby enabling the cover portion to be stably maintained at the unfolded position on the container portion.

Description

Technology Field

[0001] The present invention relates to a transport device, and more specifically, to a transport device capable of stably maintaining a cover portion disposed in the opening of a container portion at a desired position. Background Technology

[0003] Generally, molten iron produced at an ironmaking plant is loaded into a torpedo car and transported to a steelmaking plant, where it is placed in ladles and delivered to various facilities to be manufactured into molten steel. At this stage, if the crane transporting the ladles fails to operate smoothly, causing waiting times, or if the refining process at each facility is delayed, the molten iron must remain in the ladles and wait for a predetermined period.

[0004] At this time, the temperature of the molten iron may drop, potentially causing abnormalities in its composition and quality. Additionally, dust generated from the molten iron while it is waiting in the ladle can overload the dust collector; if the waiting time is prolonged, dust that is not collected by the collector may leak outside the factory, contaminating the environment.

[0005] Conventionally, covers were manufactured and stored in a separate location, and when needed, they were moved by a molten metal crane and placed on top of the ladle. However, after the cover is placed on the ladle, the molten metal crane must move for other operations, and the cover placed on the ladle must be maintained in that position using the frictional force of the contact surface with the ladle.

[0006] In this case, when moving the ladle with the cover resting on top using a molten metal crane, the structure of the crane, which transports heavy loads via wires, may cause the ladle to sway. If the force applied to the cover due to this swaying exceeds the frictional force between the ladle and the cover, the cover may slip and fall. Therefore, there is a problem in that it is difficult to use the cover while transporting the ladle with the molten metal crane.

[0007] In addition, in the case of a ladle with a protruding discharge port (also referred to as a 'wagu' or 'pelican') for guiding the discharge of molten metal from the top, the top is sloped due to the discharge port, so the cover must also be seated on the top of the ladle at an angle. Since it is difficult for a cover seated at an angle to remain in position on the top of the ladle solely by friction, the cover may slide off the top of the ladle. Therefore, there is a problem in that it is difficult to use a cover in the case of a ladle with a discharge port formed on the top.

[0008] The technology forming the background of the present invention is disclosed in the following patent documents. Prior art literature

[0009] (Patent Document 0001) KR 10-1585778 B1(Patent Document 0002) KR 10-2100797 B1 The problem to be solved

[0010] The present invention provides a transport device capable of stably maintaining a cover portion placed in the opening of a container portion at a desired position. means of solving the problem

[0012] A conveying device according to an embodiment of the present invention comprises: a container portion having a space for receiving a molten material and having an opening at the top; a cover portion installed on the container portion so as to be deployed along the top of the container portion to cover the opening; a driving portion installed on the container portion and connected to the cover portion so as to transmit the movement of a conveyor to the cover portion to deploy the cover portion; and a locking portion installed on the container portion so as to be coupled with the driving portion to fix the movement of the driving portion in order to maintain the cover portion at the deployed position on the top of the container portion.

[0013] It may include a lock release unit installed to separate the lock unit from the drive unit by utilizing at least one of contact with a trolley for seating the container unit and movement of the carrier for tilting the container unit.

[0014] It may include a guide portion extending upward from the side of the container portion to guide the unfolding and returning movements of the cover portion.

[0015] It may include a recovery unit installed on the side of the container portion and connected to the cover portion to provide a return force to the cover portion in the opposite direction to the direction in which the cover portion is unfolded.

[0016] It may include a housing portion installed on the side of the container portion to allow the cover portion to be withdrawn and stored.

[0017] The height of the front upper portion of the container is higher than the height of the rear upper portion, and the cover portion is installed on the rear side of the container portion so as to be deployed from the rear upper portion to the front upper portion, and the drive portion is vertically connected to the cover portion at the rear side of the container portion when the cover portion is stored, and can be obliquely connected to the cover portion at the top of the container portion when the cover portion is deployed.

[0018] The above cover portion may include: a cover formed to be bendable and having an area capable of covering the opening; a support shaft mounted on the cover and extending in the left-right direction of the container portion so as to be supported on the upper portion of the container portion surrounding the opening; and guide wheels mounted on each end of the support shaft to travel along the upper portion of the container portion.

[0019] The above cover is provided with a plurality of bodies that are rotatably coupled to one another, and the plurality of bodies are extended in the left-right direction and arranged in the front-rear direction, and the support shafts are provided with a plurality of shafts that are arranged in the front-rear direction of the container part and can adjust their length in the left-right direction.

[0020] The above support shaft may include: a hollow tube; an elastic spring disposed inside the hollow tube; and a plurality of protruding bars each connected to both sides in the left and right directions of the elastic spring, each protruding to both sides in the left and right directions of the hollow tube, with the guide wheel mounted at each end.

[0021] The above drive unit may include: an elevator installed on the side of the container portion to be able to ascend and descend in conjunction with the hook of the carrier; a deployment wire installed to pass through the wall of the container portion, with one end connected to the upper part of the cover portion and the other end connected to the lower part of the elevator; and a plurality of pulleys installed at multiple positions inside and outside the wall of the container portion to support the deployment wire.

[0022] The locking member may include: a rack gear mounted on one side of the driving member and moving in the same manner as one side of the driving member; a pinion gear installed at a position that can be coupled with the rack gear when the cover member is unfolded; a ratchet gear coaxially connected to the pinion gear; and a pawl member installed in contact with the ratchet gear to allow forward rotation of the ratchet gear and restrict reverse rotation.

[0023] The above unlocking unit may include: a lifting bar connected to the locking unit so as to raise the locking unit in a direction away from the driving unit to separate the locking unit from the driving unit; and an operating bar positioned such that one side contacts the trolley when the container unit is seated, and the other side faces the lower end of the lifting bar in an up-and-down direction, in order to raise the lifting bar by using contact with the trolley.

[0024] The above unlocking unit may include: a first cylinder positioned opposite to a seal hook so as to be able to contact a seal hook provided in the container unit; a cylinder block on which the first cylinder is mounted; a second cylinder installed so as to be able to protrude upward from the cylinder block by the first cylinder entering the cylinder block through contact between the first cylinder and the seal hook; and a contact bar extending from the operating bar and positioned such that its end faces the second cylinder in an up-and-down direction.

[0025] The guide portion may include a plurality of rails that are spaced apart from each other on both sides in the left and right directions of the container portion, maintain a mutual spacing at the side and rear upper portion of the container portion, and have a mutual spacing that narrows along the perimeter of the opening of the container portion at the front upper portion of the container portion.

[0026] The above recovery unit may include a pull wire connected to the lower part of the cover unit; and a pull reel installed on the side of the container unit to wind the pull wire using elastic force.

[0027] The housing portion may include: a main body formed to a size in which the cover portion can be accommodated and having at least an open top; a door disposed on the upper part of the main body to protect the interior of the main body and having a damper; a rotating shaft that rotatably mounts the door to the main body so that the door can be rotated to open the main body when the cover portion is pulled out; and a contact projection protruding from the door with a length that can contact the cover portion when the cover portion is stored, so that the door can be rotated to return the door when the cover portion is stored. Effects of the invention

[0028] According to an embodiment of the present invention, a driving unit can deploy a cover unit onto an opening at the top of a container unit by utilizing the movement of a carrier. Furthermore, once the deployment of the cover unit is complete, a locking unit fixes the movement of the driving unit, thereby stably maintaining the deployed state of the cover unit on the top of the container unit. Accordingly, in any situation where the container unit is handled by a carrier, such as when the container unit is lifted, transported, or lowered, the cover unit can be positioned onto the opening at the top of the container unit and stably maintained in that state.

[0029] Therefore, it is possible to prevent the cover from detaching from the container or the cover from shifting position while handling the container with a carrier, thereby preventing the temperature of the molten material contained in the container from dropping and preventing dust generated from the molten material from leaking into the atmosphere. Brief explanation of the drawing

[0030] FIG. 1 is a schematic diagram showing the cover portion of a transport device according to an embodiment of the present invention being housed. FIG. 2 is a schematic diagram showing the unfolded cover portion of a transport device according to an embodiment of the present invention. FIG. 3 is a schematic diagram showing the housing part omitted from FIG. 2 to show the driving part, locking part, unlocking part, guide part, and retrieval part of a transport device according to an embodiment of the present invention. FIG. 4 is a conceptual diagram of a support shaft of a conveying device according to an embodiment of the present invention. Figure 5 is a schematic diagram showing an enlarged view of part A of Figure 3. Figure 6 is a schematic diagram showing an enlarged view of part B of Figure 3. Figure 7 is an enlarged side view of part C of Figure 3. FIG. 8 is a side cross-sectional view of a transport device according to an embodiment of the present invention. Figure 9 is a side cross-sectional view showing an enlarged view of section D of Figure 8. FIG. 10 is a side cross-sectional view showing an enlarged view of section E of FIG. 8. FIG. 11 is a side view showing the cover portion of a transport device according to an embodiment of the present invention being received in a housing portion. FIG. 12 is a side cross-sectional view showing the operation of an unlocking unit according to an embodiment of the present invention. FIG. 13 is a side cross-sectional view showing the locking part according to an embodiment of the present invention being released from the drive part. Specific details for implementing the invention

[0031] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The embodiments of the present invention are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. To explain the embodiments of the present invention, the drawings may be exaggerated, parts unrelated to the description may be omitted from the drawings, and like reference numerals in the drawings refer to like elements.

[0032] In the following, embodiments of the present invention are described in detail based on a conveying device that is applied to a ladle for transporting molten iron and can stably cover the opening at the top of the ladle.

[0033] Of course, the transport device according to the embodiment of the present invention can be applied to a processing facility that processes a type of material that can be transported in a container and must be protected from the external environment during transport, and can be applied to a transport device that can stably cover the upper opening of the container containing the material during transport.

[0034] FIG. 1 is a schematic diagram showing the cover portion of a transport device according to an embodiment of the present invention in a stored state, and FIG. 2 is a schematic diagram showing the cover portion of a transport device according to an embodiment of the present invention in an unfolded state. In addition, FIG. 3 is a schematic diagram showing the housing portion omitted from FIG. 2 to show the driving portion, locking portion, unlocking portion, guide portion, and retrieval portion of the transport device according to an embodiment of the present invention.

[0035] Referring to FIGS. 1 to 3, a conveying device according to an embodiment of the present invention comprises: a container part (100) having a space for receiving a molten material and having an opening (H) at the top; a cover part (200) installed in the container part (100) so as to be unfolded along the top of the container part (100) to cover the opening (H); a driving part (300) installed in the container part (100) and connected to the cover part (200) so as to transmit the movement of a conveyor (10) to the cover part (200) to unfold the cover part (200); and a locking part (400) installed in the container part (100) so as to be coupled with the driving part (300) to fix the movement of the driving part (300) in order to maintain the cover part (200) at the unfolded position on the top of the container part (100).

[0036] Additionally, the transport device may include a locking unit (500) installed to separate the locking unit (400) from the driving unit (300) by utilizing at least one of the movements of contact between the container unit (100) and the trolley and tilting of the container unit (100). Additionally, the transport device may include a guide unit (600) extending upward from the side of the container unit (100) to guide the unfolding and returning movements of the cover unit (200). Additionally, the transport device may include a recovery unit (700) installed on the side of the container unit (100) and connected to the cover unit (200) to provide a return force to the cover unit (200) in the opposite direction to the direction in which the cover unit (200) unfolds. Additionally, the transport device may include a housing unit (800) installed on the side of the container unit (100) to allow the cover unit (200) to be withdrawn and stored.

[0037] Maintaining the cover portion (200) in a position unfolded on the upper part of the container portion (100) means maintaining the cover portion (200) in an unfolded state on the upper part of the container portion (100) when the cover portion (200) is in a state unfolded on the upper part of the container portion (100) to cover the opening (H) of the container portion (100). In other words, it means maintaining the cover portion (200) unfolded over the opening (H) of the container portion (100) in that position. To express this differently, it means maintaining the cover portion (200) in an unfolded state on the upper part of the container portion (100).

[0038] The molten material may include molten iron produced in the ironmaking plant of a steel mill. Of course, the molten material may be of various types, such as molten steel and slag. The molten material may be contained in a container (100). The molten material may be injected into a molten material receiving space inside the container (100) by passing through an opening (H) of the container (100). Additionally, the molten material may be discharged from the molten material receiving space to the outside of the container (100) by passing through the opening (H).

[0039] The carrier (10) may be formed to be able to lift, transport, tilt, and lower a transport device. The carrier (10) may be placed in a transport path of molten material. The carrier (10) may include, for example, a molten metal crane. The molten metal crane may include a crane rail (not shown) installed spaced apart from the ground or the floor of a steelmaking plant workshop, a crane body (not shown) installed to be able to travel along the crane rail, a plurality of wire drums (not shown) installed on the crane body, a plurality of motors (not shown) connected to the plurality of wire drums, a main hoist hook (11) and a secondary hoist hook (12) placed on the lower side of the crane body, and a plurality of wire ropes (13, 14) supporting the main hoist hook (11) and the secondary hoist hook (12) on their respective wire drums.

[0040] The main hoist hook (11) can be connected to the main hoist hanger (130) of the container unit (100). By raising, moving, and lowering the main hoist hook (11), the container unit (100) can be hoisted, transported, and lowered. The auxiliary hoist hook (12) can be connected to the auxiliary hoist hanger (140) of the container unit (100). The container unit (100) can be tilted by raising the auxiliary hoist hook (12), and the tilting of the container unit (100) can be released by lowering the auxiliary hoist hook (12).

[0041] The container portion (100) may be formed to receive and discharge molten material. The container portion (100) may include a bottom plate (110) having a predetermined area and a wall (120) extending upward from the edge of the bottom plate (110). The bottom plate (110) may extend in a horizontal direction. The wall (120) may extend in an up-and-down direction. The wall (120) may be referred to as a side wall. Meanwhile, the horizontal direction may include the front-back direction and the left-right direction. The up-and-down direction may be a direction intersecting the horizontal direction.

[0042] Refractory material may be constructed on the upper surface of the bottom plate (110) and the inner surface of the wall (120). A space for receiving molten material may be formed between the bottom plate (110) and the wall (120). The bottom plate (110) may be, for example, in the shape of a disc. The wall (120) may be, for example, in the shape of a hollow cylinder. Accordingly, the overall shape of the container part (100) may be a cylindrical shape with an opening (H) formed at the top. Of course, the shapes of the bottom plate (110) and the wall (120) may vary.

[0043] The container (100) may include a main winding hook (130), a secondary winding hook (140), and an outlet (150). The main winding hook (130) may extend in the left and right directions and may be mounted on the outer surface of the wall (120) on each side in the left and right directions of the wall (120). The main winding hook (130) may be, for example, cylindrical in shape. The main winding hook (130) may be coupled with the main winding hook (11) of the carrier (10). Here, coupling means inserting the main winding hook (130) into the loop portion of the main winding hook (11) and bringing the lower surface of the main winding hook (130) into contact with the main winding hook (11). The main winding hook (130) may be referred to as a trinion.

[0044] The hoist hook (140) extends in the front-rear direction and may include a tilting arm that is rotatably mounted on the front lower surface of the base plate (110) and whose end protrudes rearward from the base plate (110), and a tilting ring that is rotatably mounted on the end of the tilting arm. At this time, protrusions may be formed protruding on both the left and right sides of the tilting ring. Additionally, a support member (121) may be formed on the lower part of the wall (120) so that the protrusions of the tilting ring can be hooked and supported on the lower part of the wall (120). The tilting ring may be coupled with the hoist hook (12) of the carrier (10).

[0045] The discharge port (150) may be formed at the front upper portion of the wall (120). The discharge port (150) may protrude upward from the wall (120). The height of the discharge port (150) may increase from the left and right edges toward the center in the left and right directions. Due to the discharge port (150), the height of the front upper portion of the container (100) may be higher than the height of the rear upper portion.

[0046] The cover portion (200) may be installed on the rear side of the container portion (100) so that it can be deployed from the rear upper portion of the container portion (100) to the front upper portion. The cover portion (200) may be positioned in an up-and-down direction on the rear side of the container portion (100). The upper portion of the cover portion (200) may be connected to the driving portion (300). The lower portion of the cover portion (200) may be connected to the recovery portion (700). The left and right edges of the cover portion (200) may be supported by the guide portion (600). While the cover portion (200) is located on the rear side of the container portion (100), it may be supported in an up-and-down direction by the driving portion (300) and the recovery portion (700), and may be supported in a left-right direction and a front-back direction by the guide portion (600). The cover portion (200) can be extended from the rear upper portion of the container portion (100) to the front upper portion to cover the opening (H) at the top of the container portion (100). At this time, while the cover portion (200) is positioned on the top of the container portion (100), it can be supported in the front-rear and up-down directions by the driving portion (300) and the recovery portion (700), and can be supported in the left-right direction by the guide portion (600).

[0047] The cover portion (200) may include a cover (210) having a surface facing the container portion (100) and a back surface facing the surface, having an area capable of covering the opening (H), and being formed to be bendable in the front-rear and up-down directions, a support shaft (220) mounted on the back surface of the cover (210) and extending in the left-right direction of the container portion (100) so as to be supported on the upper part of the container portion (100) surrounding the opening (H), and guide wheels (230) each mounted on both ends of the support shaft (220) to travel along the upper part of the container portion (100).

[0048] The cover (210) may be in the shape of a disc, wherein the length in the front-rear direction or the up-down direction is longer than the length in the left-right direction. The cover (210) may have a plurality of bodies coupled to be rotatable to each other in the front-rear direction and the up-down direction. The plurality of bodies may extend in the left-right direction and be arranged in the front-rear direction or the up-down direction.

[0049] The support shaft (220) may be extended in the left-right direction. Multiple support shafts (220) may be provided and may be arranged in the front-rear or up-down direction of the container part (100). The support shaft (220) may be supported by the guide part (600). The cover (210) may travel in the up-down and front-rear directions along the guide part (600) by means of the support shaft (220). At this time, fitting protrusions (not shown) may be formed on the outer surface of both ends of the support shaft (220) in the left-right direction to prevent the support shaft (220) from coming off. Additionally, a fitting groove (not shown) may be formed in the guide part (600) so that the fitting protrusion of the support shaft (220) can be inserted and slide along the guide part (600).

[0050] FIG. 4 is a conceptual diagram of a support shaft of a conveying device according to an embodiment of the present invention.

[0051] Referring to FIGS. 3 and 4, the support shaft (220) may be formed to be adjustable in length according to the width of the opening (H) in the left and right directions. That is, the support shaft (220) may be formed to be adjustable in length in the left and right directions. The support shaft (220) may include a hollow tube (221) that extends in the left and right directions and is mounted at the center of the left and right directions of the back surface of the cover (210), an elastic spring (222) disposed inside the hollow tube (221), and a plurality of protruding bars (223) that are respectively connected to both sides in the left and right directions of the elastic spring (222), protrude to both sides in the left and right directions of the hollow tube (221), and each end of which is equipped with a guide wheel (230).

[0052] For example, the width of the guide section (600) in the left-right direction may be constant at the rear upper and rear side portions of the container section (100). On the other hand, the width of the guide section (600) in the left-right direction may decrease as it moves forward at the front upper portion of the container section (100).

[0053] Accordingly, the support shaft (220) can be extended in the left-right direction by elastically expanding the elastic spring (222) at the rear upper and rear side portions of the container portion (100), and shortened in the left-right direction by elastically contracting the elastic spring (222) at the front upper portion of the container portion (100). Accordingly, the left-right ends of the support shaft (220) can maintain smooth contact with the guide portion (600). The guide wheel (230) can be mounted on the left-right ends of the support shaft (220) and can be arranged to surround the left-right outer portion of the guide portion (600).

[0054] FIG. 5 is a schematic diagram showing an enlarged view of part A of FIG. 3, FIG. 6 is a schematic diagram showing an enlarged view of part B of FIG. 3, and FIG. 7 is a side view showing an enlarged view of part C of FIG. 3.

[0055] In addition, FIG. 8 is a side cross-sectional view of a conveying device according to an embodiment of the present invention, FIG. 9 is an enlarged side cross-sectional view of portion D of FIG. 8, and FIG. 10 is an enlarged side cross-sectional view of portion E of FIG. 8.

[0056] The driving unit (300) can be vertically connected to the cover unit (200) at the rear side of the container unit (100) when the cover unit (200) is stored. Additionally, the driving unit (300) can be obliquely connected to the cover unit (200) at the top of the container unit (100) when the cover unit (200) is unfolded.

[0057] Referring to FIGS. 3, 5 to 8, the driving unit (300) may include an elevator (310) installed on the side of the container unit so as to be able to ascend and descend by being coupled with the lifting hook (12) of the carrier (10), a deployment wire (320) installed to pass through the wall (120) of the container unit (100), with one end connected to the upper part of the cover unit (200) and the other end connected to the lower part of the elevator (310), and a plurality of pulleys (330) installed at multiple positions inside and outside the wall (120) of the container unit (100) to support the deployment wire (320).

[0058] The elevator (310) may include a lifting block (311) positioned to be movable on the rear side of the container (100), a connecting bar (312) mounted on the back of the lifting block (311), and a hook catch (313) mounted on the rear end of the connecting bar (312).

[0059] The lifting block (311) may be placed inside the housing portion (800). A deployment wire (320) may be connected to the lower surface of the lifting block (311). The lifting block (311) may be supported by contacting the inner surface of the housing portion (800). At this time, a lifting roller (314) may be installed on the back surface of the lifting block (311) so as to be in contact with the inner surface of the housing portion (800). The lifting roller (314) may be formed to be able to travel in an up-and-down direction along the inner surface of the housing portion (800) while maintaining contact with the inner surface of the housing portion (800). Of course, a lifting shaft (not shown) may be placed on the rear side of the container portion (100) to support the lifting of the lifting block (311). The lifting shaft can be installed to penetrate the lifting block (311) in the vertical direction, and both ends in the vertical direction can be supported on the wall (120) of the container part (100).

[0060] A connecting bar (312) can be mounted to connect the lifting block (311) and the hook catch (313). The connecting bar (312) can be positioned to penetrate the housing portion (800) in the front-rear direction. By means of the connecting bar (312), the hook catch (313) and the lifting block (311) can move up and down in the same manner in the up-and-down direction.

[0061] The hook catch (313) may be formed in a block shape, for example. The hook catch (313) may have an insertion groove (not shown) formed on its lower surface so that the loop portion of the auxiliary hook (12) can be inserted. The hook catch (313) may be positioned at the rear of the housing portion (800).

[0062] Referring to FIGS. 7 to 10, the unfolding wire (320) may be installed to penetrate the wall (120) in the vertical direction at the front side of the container part (100) and to penetrate the bottom plate (110) in the front-rear direction at the bottom of the container part (100). One end of the unfolding wire (320) may penetrate the upper part of the wall (120), pass through the wire hole (620) on the outer surface of the guide part (600), and be connected to the support shaft (220) of the cover part (200).

[0063] Due to this structure, the deployment wire (320) can always be positioned on the outer surface of the guide section (600) at the top of the container section (100). Accordingly, the guide section (600) can act as a shield for the molten material contained inside the container section (100), and the deployment wire (320) can be protected from the molten material. The other end of the deployment wire (320) can penetrate the bottom plate (110) and extend rearward, and can be bent upward to be connected to the lower surface of the lifting block (311).

[0064] Meanwhile, multiple development wires (320) may be provided, and each may be connected to both ends of the support shaft (220) of the cover part (200) by passing through wire holes (620) formed on the outer surface of the guide part (600) on both sides in the left and right directions of the guide part (600).

[0065] Pulleys (330) can be installed at multiple locations along the path where the deployment wire (320) travels. The deployment wire (320) can be smoothly bent by the pulleys (330).

[0066] The driving unit (300) can raise the connecting bar (312) and the lifting block (311) simultaneously with the hook catch (313) by utilizing the upward pulling of the hook catch (313) by the lifting hook (12), and can unfold the cover unit (200) connected to one end of the unfolding wire (320) from the rear upper to the front upper of the container unit (100) by pulling the other end of the unfolding wire (320) connected to the lower surface of the lifting block (311). When the lifting hook (12) is separated from the hook catch (313), the driving unit (300) can lower the cover unit (200) using the weight of the cover unit (200), and at this time, the lifting block (311) can be pulled downward by the other end of the unfolding wire (320).

[0067] At this time, even after the lifting hook (12) is separated from the hook catch (313), the movement of the lifting block (311) of the driving unit (300) can be fixed for a desired time using the locking unit (400) with a force greater than the weight of the cover unit (200) so that the unfolded state of the cover unit (200) can be maintained for a desired time, and thereby the cover unit (200) can be maintained in an unfolded state on the opening (H) of the container unit (100) for a desired time.

[0068] Referring to FIGS. 5, 8 and 9, the locking member (400) may include a rack gear (410) mounted on one side of the driving member (300) and moving in the same manner as one side of the driving member (300), a pinion gear (420) installed at a position that can be coupled with the rack gear (410) when the cover member (200) is unfolded, a ratchet gear (430) coaxially connected with the pinion gear (420), and a pawl member (440) installed in contact with the ratchet gear (430) to allow forward rotation of the ratchet gear (430) and restrict reverse rotation.

[0069] A rack gear (410) can be mounted on one side of a lifting block (311). The rack gear (410) can move up and down in the same way as the lifting block (311). A pinion gear (420) can be positioned so as to be coupled with the rack gear (410) on one side of the lifting block (311) at the height where the lifting block (311) is located when the cover portion (200) is unfolded. Here, the one side may be the side facing the container portion (100).

[0070] The ratchet gear (430) may be a gear with teeth formed in a hook shape on its outer surface so that forward rotation is allowed and reverse rotation is prevented. Here, forward rotation refers to the rotation in the direction in which the rack gear (410) engages with the pinion gear (420) to rotate the pinion gear (420) when the lifting block (311) rises. For example, as shown in FIG. 9, counterclockwise rotation can be referred to as forward rotation. The ratchet gear (430) is coaxially connected with the pinion gear (420) so that it can rotate in the same way as the pinion gear (420).

[0071] The pawl member (440) is installed to be rotatable at a position opposite the ratchet gear (430) so as to allow forward rotation of the ratchet gear (430) and prevent reverse rotation, and can come into contact with the ratchet gear (430). When the ratchet gear (430) rotates in the forward direction, the pawl member (440) rotates to allow the forward rotation of the ratchet gear (430). When the ratchet gear (430) rotates in the reverse direction, the pawl member (440) engages with the ratchet gear (430) to restrain the reverse rotation of the ratchet gear (430). When the reverse rotation of the ratchet gear (430) is constrained, the reverse rotation of the pinion gear (420) is also constrained, and the downward movement of the rack gear (410) geared with the pinion gear (420) and the lifting block (411) equipped with the rack gear (410) is prevented, thereby maintaining the state in which the other end of the unfolding wire (320) is pulled upward, and thus, the unfolded state of the cover part (200) can be maintained.

[0072] In this way, the transport device can stably maintain the position of the cover part (200) on the opening (H) of the container part (100) even if the drive part (300) does not subsequently transmit the movement of the transporter (10) to the cover part (200) by using the drive part (300) to deploy the cover part (200) on the opening (H) of the container part (100) and then using the locking part (400) to fix the movement of the drive part (300).

[0073] Furthermore, the transport device can restrict the movement of the cover part (200) by fixing the drive part (300) while the lock part (400) is fixing the movement of the drive part (300), so that the position of the cover part (200) can be stably maintained on the opening (H) of the container part (100).

[0074] Referring to FIGS. 3, 5, 9 to 11, the unlocking unit (500) serves to release the connection between the locking unit (400) and the driving unit (300) so that the cover unit (200) can be moved to the rear side of the container unit (100) and stored.

[0075] The unlocking unit (500) may include a lifting bar (510) connected to the locking unit (400) to raise the locking unit (400) away from the driving unit (300) in a direction away from the driving unit (300), and an operating bar (520) which is positioned such that one side contacts the trolley (not shown) when the container unit (100) is seated, and the other side is positioned to face the lower end of the lifting bar (510) in an up-and-down direction, in order to raise the lifting bar (510) by using contact with the trolley.

[0076] The lifting bar (510) can be extended downward from the central axis of the pawl member (440). When the lifting bar (510) is raised, the pawl member (440) can be raised and separated from the ratchet gear (430), thereby enabling reverse rotation of the ratchet gear (430) and the pinion gear (420), and enabling the lowering of the rack gear (410) and the lifting block (311).

[0077] Referring to FIG. 3, the operating bar (520) may include a plurality of first operating members (521) that are spaced apart from each other in the left-right direction of the container part (100) at the bottom of the container part (100), extend in the front-rear direction, and have a front end bent downward; a plurality of second operating members (522) that are mounted to connect between the plurality of first operating members (521) at the rear side of the container part (100), at least one of which faces the lifting bar (510) in the up-down direction; a third operating member (523) that is positioned at the bottom of the container part (100) to support the lower surface of the plurality of first operating members (521) and extends in the left-right direction; and a fourth operating member (524) that is positioned to wrap around the front end of the plurality of first operating members (521) and is supported by the wall (120) of the container part (100).

[0078] When the container part (100) is placed on the trolley (not shown), the front end of the first operating member (521) comes into contact with the seating part (not shown) of the trolley and rises, and thereby the first operating member (521) and the second operating member (522) rise and can come into contact with the lifting bar (510). Accordingly, the lifting bar (510) rises and can raise the pole member (440).

[0079] Meanwhile, referring to FIG. 10, the unlocking unit (500) may include a first cylinder (530) positioned opposite to the seal holder (140) so as to be able to contact the seal holder (140) provided in the container unit (100), a cylinder block (540) on which the first cylinder (530) is mounted, a second cylinder (550) installed so as to be able to protrude upward from the cylinder block (540) by the first cylinder (530) entering the cylinder block (540) through contact between the first cylinder (530) and the seal holder (140), and a contact bar (560) extending from the operating bar (520) and positioned so that its end faces the second cylinder (550) in an up-and-down direction. At this time, a hydraulic chamber is provided inside the cylinder block (540), and when the first cylinder (530) enters the hydraulic chamber, the second cylinder (550) can be raised upward by the reaction force.

[0080] Accordingly, when the unlocking unit (500) raises the holding hook (12) by connecting it to the holding hook (140) for tilting the container unit (100), it brings the first cylinder (530) into contact with the holding hook (140), and from there, raises the second cylinder (550) from the cylinder block (540) to raise the contact bar (560), thereby raising the operating bar (520).

[0081] Accordingly, the unlocking unit (500) can be operated by tilting the container unit (100) to release the fixation of the driving unit (300), and the cover unit (200) can be moved from the upper part of the container unit (100) to the rear side of the container unit by its own weight and stored.

[0082] Accordingly, the transport device can quickly release the connection between the drive unit (300) and the lock unit (400) by using the unlock unit (500) while placing the container unit (100) on the trolley. That is, by placing the container unit (100) on the trolley, the connection between the drive unit (300) and the lock unit (400) can be released. Accordingly, after placing the cover unit (200) on the trolley, the cover unit (200) can be quickly returned from the top of the container unit (100) to the side of the container unit (100). That is, the cover unit (200) can be quickly separated from the opening (H) of the container unit (100).

[0083] Additionally, the transport device can quickly release the connection between the drive unit (300) and the locking unit (400) by using the unlocking unit (500) while tilting the container unit (100). Accordingly, when the container unit (100) is tilted, the cover unit (200) can be quickly returned from the top of the container unit (100) to the side of the container unit (100) for storage.

[0084] Referring to FIGS. 2 and 3, the guide portion (600) may include a plurality of rails (610) formed by extending upward from the rear side of the container portion (100). At this time, the plurality of rails (610) may be spaced apart from each other on both sides in the left and right directions, and may maintain a distance from each other on the side and rear upper of the container portion (100). Additionally, the plurality of rails (610) may have a narrower distance from each other along the perimeter of the opening of the container portion (100) at the front upper of the container portion (100).

[0085] Accordingly, the transport device can stably guide the unfolding movement and the return movement of the cover part (200) using the guide part (600). That is, by using the guide part (600), it is possible to prevent the cover part (200) from shaking in the width direction during the unfolding and return of the cover part (200).

[0086] Meanwhile, to prevent damage to the multiple rails (610) when discharging the molten material, the front ends of the multiple rails (610) in the front-rear direction may be spaced apart from each other in the left-right direction. Additionally, when the container part (100) tilts, the molten material may be discharged through the spaced-apart portion between the front ends of the multiple rails (610).

[0087] Referring to FIGS. 3, 5 and 6, the recovery unit (700) may include a pull wire (710) connected to the lower part of the cover unit (100), and a pull reel (720) installed on the side of the container unit (100) to wind the pull wire (710) using elastic force.

[0088] The pull wire (710) can be connected to the lower part of the cover portion (200), and its length is adjusted by the rotation of the pull reel (720), allowing the cover portion (200) to be pulled downward or released upward. The pull reel (720) can use elastic force to wind the pull wire (710) around the outer surface. When the cover portion (200) is unfolded, a force greater than the elastic force of the pull reel (720) acts on the pull wire (710), causing the pull wire (710) to be released from the pull reel (720). When the cover portion (200) is stored, the force pulling the pull wire (710) upward is released, allowing the pull wire (710) to be wound onto the pull reel (720) by the elastic restoring force of the pull reel (720), thereby allowing the cover portion (200) to be pulled downward.

[0089] Accordingly, the transport device can stably return the cover part (200) from the top to the side of the container part (100) by providing a return force to the cover part (200) using the recovery part (700).

[0090] Referring to FIGS. 2 and FIGS. 8, the housing part (800) serves to protect the cover part (200), the driving part (300), the locking part (400), the unlocking part (500), and the retrieval part (700). The housing portion (800) may include a main body (810) formed to a size in which a cover portion (200) can be stored and at least the top is open, a door (820) positioned on the top of the main body (810) to protect the interior of the main body (810), a rotating shaft (830) that rotatably mounts the door (820) to the main body (810) so that the door (820) can be rotated to open the main body (810) when the cover portion (200) is pulled out, and a contact projection (840) that protrudes from the door (820) with a length that can contact the protrusion (211) of the cover portion (200) when the cover portion (200) is stored, so that the door (820) can be rotated to return the door (820) when the cover portion (200) is stored.

[0091] Referring to FIGS. 8 to 10, the main body (810) may be a separable main body that is separated into a plurality of parts. The main body (810) may include, for example, a first body (811) mounted on the rear side of the wall (120) of the container (100) to accommodate and deploy the cover part (200); a second body (812) mounted on the lower part of the first body (811) and having a recovery part (700) stored inside; a third body (813) mounted on the rear side of the first body (811) and the second body (812) at the rear of the first body (811) and the second body (812) and having a lock release part (500) stored inside; and a fourth body (814) mounted on the rear side of the third body (813) at the rear of the third body (813) and having an elevator (310) of the drive part (300) installed inside.

[0092] The first body (811) may have an open top. Inside the first body (811), the lower body of a plurality of rails (610) of the guide section (600) may be arranged in an up-and-down direction. The cover section (200) may be moved along the plurality of rails (610) into the interior of the first body (811) and stored. A second body (812) may be mounted on the lower surface of the first body (811). A pull reel (720) of the recovery section (700) may be arranged inside the second body (812). A through hole may be formed to penetrate the lower surface of the first body (811) and the upper surface of the second body (812) in an up-and-down direction. A pull wire (710) may be placed in the through hole.

[0093] The third body (813) may have its lower portion open downward. The pinion gear (420), ratchet gear (430), and pawl member (440) of the locking portion (400) may be stored inside the third body (813), and the lifting bar (510) of the unlocking portion (500) may be stored inside. At this time, the pinion gear (420), ratchet gear (430), and pawl member (440) may be located on the upper portion of the third body (813). A through hole may be formed on the rear surface of the third body (813) to allow the pinion gear (420) to protrude backward.

[0094] A through hole may be formed on one side of the fourth body (814) facing the third body (813) so that the protruding part of the pinion gear (420) can be exposed inside the fourth body (814). A lifting block (311) of the driving unit (300) may be installed inside the fourth body (814) so ​​as to be able to move up and down. A slot may be formed on the back of the fourth body (814) so ​​that a connecting bar (312) can be placed therein. The slot may extend in the up and down direction.

[0095] The door (820) serves to open and close the open upper portion of the main body (810). The door (820) can be supported on the upper portion of the fourth body (814) by a rotation axis (830). The door (820) can rotate by raising and lowering its front end around the rear end where the rotation axis (830) is mounted. The door (820) can open the interior of the main body (810) by raising its front end and close the interior of the main body (810) by lowering its front end. At this time, the opening of the main body (810) can be performed by the operation of the cover portion (200) rising and pushing the door (820) upward. Additionally, the closing of the main body (810) can be performed by the door (820) receiving downward force by the operation of the cover portion (200) lowering and the protrusion (211) striking the contact projection (840) downward. At this time, the door (820) may be equipped with a damper (not shown), and the door (820) may be prevented from closing abruptly by the damper. Meanwhile, to prevent collision between the door (820) and the multiple rails (610) of the guide part (600) when the main body (810) is closed, the door (820) may have multiple openings formed so that the multiple rails (610) can pass through.

[0096] Meanwhile, in order to maintain the door (820) in an open state after the main body (810) is opened and before the contact projection (840) is struck by the protrusion (211) of the cover part (200), a weight (not shown) may be mounted on the back surface of the door (820) so that the weight of the back surface facing the one side of the door (820) where the contact projection (840) is formed is heavier than that of the one side of the door (820). Additionally, to maintain the door (820) in an open state, detachable members such as magnets and snap buttons may be placed at the contact area between the door (820) and the fourth body (814) near the rotation axis (830), and these may be coupled together when the door (820) is opened. Of course, the force with which the detachable members are coupled may be smaller than the force that rotates the door (820) downward by striking the contact projection (840) with the protrusion (211) of the cover part (200). Accordingly, the door (820) can be smoothly maintained in an open state until the contact projection (840) is struck by the protrusion (211), and when the contact projection (840) is struck by the protrusion (211), the door (820) can rotate and close the main body (810). In addition, there may be various structures and methods for maintaining the door (820) in an open state after the door (820) is opened and until the contact projection (840) is struck by the protrusion (211).

[0097] Hereinafter, the operation of a transport device according to an embodiment of the present invention to unfold a cover portion is described.

[0098] Referring to FIG. 1, the molten material is received in the molten material receiving space of the container part (100), and the container part (100) is transported by the main hook (11) of the carrier (10).

[0099] At this time, as illustrated in FIGS. 2 and 3, the elevator (310) of the drive unit (300) is raised by the lifting hook (12). Accordingly, the unfolding wire (320) connected to the elevator (310) raises the cover unit (200), which was stored inside the housing unit (800), from the rear side of the container unit (100) and raises it at an angle from the rear upper part of the container unit (100) to the front upper part to cover the opening (H) of the container unit (100).

[0100] The molten material can be kept warm by the cover portion (200) inside the container portion (100) until it is introduced into the processing process. At this time, the container portion (100) may wait while hoisted on a carrier (10), or it may be transported to the vicinity of the molten material processing facility of a steelmaking plant and wait while resting on the floor near the facility.

[0101] Hereinafter, the operation of a transport device receiving a cover portion according to an embodiment of the present invention will be described.

[0102] FIG. 11 is a side view showing the cover portion of a transport device according to an embodiment of the present invention being received by the housing portion. FIG. 12 is a side cross-sectional view showing the operation of an unlocking portion according to an embodiment of the present invention. FIG. 13 is a side cross-sectional view showing the locking portion according to an embodiment of the present invention being released from the connection with the driving portion.

[0103] When the molten material contained in the container (100) is introduced into the processing process, the container (100) must be lifted and placed on a trolley (not shown) of the process equipment, or lifted upwards and tilted on the upper side of the process equipment.

[0104] At this time, referring to FIGS. 11 and 12, when the container part (100) is placed on the trolley, the container part (100) is positioned on the upper side of the seating part provided on the upper surface of the trolley so that the container part (100) can be placed, and the main hook is lowered to place the container part (100) on the trolley. At this time, the operating bar (520) of the unlocking part (500) comes into contact with the seating part of the trolley and rises, and due to the rise of the operating bar (520), the lifting bar (510) of the unlocking part (500) placed inside the housing part (800) comes into contact with the operating bar (520) and rises.

[0105] Additionally, referring to FIG. 13, the pole member (440) is separated from the ratchet gear (430) by the rising of the lifting bar (510), thereby enabling reverse rotation of the ratchet gear (430) and the pinion gear (420). Accordingly, the rack gear (410) and the elevator (310) descend, and at the same time, the cover part (200) descends along the guide part (600) and can be stored in the housing part (800).

[0106] Meanwhile, when tilting the container part (100), as shown in FIGS. 11 and 12, the first cylinder (530) of the unlocking part (500) comes into contact with the lock hook (140) and enters the cylinder block (540), and as a result, the second cylinder (550) rises and the contact bar (560) rises. Subsequently, as the operating bar (520) connected to the contact bar (560) rises, the lifting bar (510) of the unlocking part (500) rises.

[0107] Afterwards, as shown in FIG. 13, the pole member (440) is separated from the ratchet gear (430) by the rising of the lifting bar (510), and the ratchet gear (430) and the pinion gear (420) rotate in the reverse direction, and the rack gear (410) and the elevator (310) descend, and the cover part (200) descends along the guide part (600) and can be stored in the housing part (800).

[0109] According to the above description, the transport device according to an embodiment of the present invention can stably maintain the cover part (200) placed in the opening (H) of the container part (100) in the corresponding position by fixing the drive part (300) by the locking part (400), and can rapidly separate the cover part (200) from the opening (H) of the container part (100) by releasing the fixing of the drive part (300) by using the movement of the container part (100) by the unlocking part (500), and can stably separate the cover part (200) from the opening (H) of the container part (100) by pulling the cover part (200) with the recovery part (700). In addition, the transport device can safely store and protect the cover part (200), the drive part (300), the locking part (400), the unlocking part (500), and the recovery part (700) in the housing part (800).

[0111] The above embodiments of the present invention are for the purpose of illustrating the present invention and are not intended to limit the present invention. It should be noted that the configurations and methods disclosed in the above embodiments of the present invention may be combined or intersected in various forms and modified, and that such modified examples may also be considered within the scope of the present invention. That is, the present invention will be implemented in various different forms within the scope of the claims and equivalent technical concepts, and those skilled in the art to which the present invention pertains will understand that various embodiments are possible within the scope of the technical concept of the present invention. Explanation of the symbols

[0112] 100: Courage Unit 130: Sovereignty Hanger 140: Scroll holder 150: Outlet 200: Cover section 210: Cover 220: Support shaft 300: Driving unit 310: Elevator 311: Elevator block 312: Connecting bar 313: Hook catch 314: Lifting roller 320: Deployment wire 330: Pulley 400: Locking part 410: Rack gear 420: Pinion gear 430: Ratchet Gear 440: Pole Absence 500: Unlock section 600: Guide section 700: Recovery Unit 800: Housing Unit

Claims

Claim 1 A conveying device comprising: a container portion having a space for receiving a molten material and having an opening at the top; a cover portion installed on the container portion so as to be deployed along the top of the container portion to cover the opening; a drive portion installed on the container portion and connected to the cover portion so as to transmit the movement of a carrier to the cover portion to deploy the cover portion; a lock portion installed on the container portion so as to be coupled with the drive portion to fix the movement of the drive portion in order to maintain the cover portion in a deployed position at the top of the container portion; and an unlock portion installed to be able to separate the lock portion from the drive portion by using at least one of contact with a trolley for seating the container portion and the movement of the carrier for tilting the container portion. Claim 2 delete Claim 3 A conveying device according to claim 1, comprising a guide portion extending upward from the side of the container portion to guide the unfolding movement and return movement of the cover portion. Claim 4 A conveying device comprising: a container portion having a space for receiving a molten material and having an opening at the top; a cover portion installed on the container portion so as to be deployed along the top of the container portion to cover the opening; a drive portion installed on the container portion and connected to the cover portion so as to transmit the movement of a carrier to the cover portion to deploy the cover portion; a locking portion installed on the container portion so as to be coupled with the drive portion to fix the movement of the drive portion in order to maintain the cover portion at the deployed position on the top of the container portion; and a recovery portion installed on the side of the container portion and connected to the cover portion to provide a return force to the cover portion in the opposite direction to the direction in which the cover portion is deployed. Claim 5 A conveying device comprising: a container portion having a space for receiving a molten material and having an opening at the top; a cover portion installed on the container portion so as to be deployed along the top of the container portion to cover the opening; a drive portion installed on the container portion and connected to the cover portion so as to transmit the movement of a carrier to the cover portion to deploy the cover portion; a locking portion installed on the container portion so as to be coupled with the drive portion to fix the movement of the drive portion in order to maintain the cover portion at the deployed position on the top of the container portion; and a housing portion installed on the side of the container portion so as to be able to withdraw and store the cover portion. Claim 6 A transport device according to any one of claims 1, 3 to 5, wherein the height of the front upper portion of the container is higher than the height of the rear upper portion, the cover portion is installed on the rear side of the container portion so as to be unfolded from the rear upper portion to the front upper portion, and the driving portion is vertically connected to the cover portion at the rear side of the container portion when the cover portion is stored, and is obliquely connected to the cover portion at the top of the container portion when the cover portion is unfolded. Claim 7 A conveying device according to any one of claims 1, 3 to 5, wherein the cover portion comprises: a cover formed to be bendable and having an area capable of covering the opening; a support shaft mounted on the cover and extending in the left-right direction of the container portion so as to be supported on the upper portion of the container portion surrounding the opening; and guide wheels mounted on each end of the support shaft to travel along the upper portion of the container portion. Claim 8 In claim 7, the cover comprises a plurality of bodies rotatably coupled to each other, the plurality of bodies extend in the left-right direction and are arranged in the front-rear direction, and the support shafts are provided in a plurality and are arranged in the front-rear direction of the container part and are a transport device capable of length adjustment in the left-right direction. Claim 9 A conveying device according to claim 8, wherein the support shaft comprises: a hollow tube; an elastic spring disposed inside the hollow tube; and a plurality of protruding bars each connected to both sides in the left and right directions of the elastic spring, each protruding to both sides in the left and right directions of the hollow tube, and each having a guide wheel mounted at its respective end. Claim 10 A conveying device according to any one of claims 1, 3 to 5, wherein the driving unit comprises: an elevator installed on the side of the container portion so as to be able to ascend and descend in conjunction with the hook of the conveyor; a deployment wire installed to pass through the wall of the container portion, having one end connected to the upper part of the cover portion and the other end connected to the lower part of the elevator; and a plurality of pulleys installed at multiple positions inside and outside the wall of the container portion to support the deployment wire. Claim 11 A conveying device according to any one of claims 1, 3 to 5, wherein the locking member comprises: a rack gear mounted on one side of the driving member and moving in the same manner as one side of the driving member; a pinion gear installed at a position that can be coupled with the rack gear when the cover member is unfolded; a ratchet gear coaxially connected to the pinion gear; and a pawl member installed in contact with the ratchet gear to allow forward rotation of the ratchet gear and restrict reverse rotation. Claim 12 A conveying device according to claim 1, wherein the unlocking unit comprises: a lifting bar connected to the locking unit so as to raise the locking unit in a direction away from the driving unit to separate the locking unit from the driving unit; and an operating bar arranged such that one side contacts the trolley when the container unit is seated, and the other side faces the lower end of the lifting bar in an up-and-down direction, in order to raise the lifting bar by using contact with the trolley. Claim 13 A conveying device according to claim 12, wherein the unlocking part comprises: a first cylinder positioned opposite to a seal hook so as to be able to contact a seal hook provided in the container part; a cylinder block on which the first cylinder is mounted; a second cylinder installed so as to be able to protrude upward from the cylinder block by the first cylinder entering the cylinder block by contact between the first cylinder and the seal hook; and a contact bar extending from the operating bar and positioned such that its end faces the second cylinder in an up-and-down direction. Claim 14 A conveying device according to claim 3, wherein the guide portion comprises a plurality of rails that are spaced apart from each other on both sides in the left-right direction of the container portion, maintain a mutual spacing at the side and rear upper portion of the container portion, and have a mutual spacing that narrows along the perimeter of the opening of the container portion at the front upper portion of the container portion. Claim 15 A conveying device according to claim 4, wherein the recovery unit comprises: a pull wire connected to the lower part of the cover unit; and a pull reel installed on the side of the container unit to wind the pull wire using elastic force. Claim 16 A conveying device according to claim 5, wherein the housing portion comprises: a main body formed to a size in which the cover portion can be accommodated and having at least an open top; a door disposed on the upper part of the main body to protect the interior of the main body and having a damper; a rotating shaft for rotatably mounting the door to the main body so that the door can be rotated to open the main body when the cover portion is pulled out; and a contact projection protruding from the door with a length capable of contacting the cover portion when the cover portion is stored, so that the door can be rotated to return the door when the cover portion is stored for the return of the door.

Images