Molten metal entry prevention device and molten metal entry prevention method

Abstract

To provide a molten metal entry prevention device which can prevent molten metal from entering into an insertion hole of a flask alignment pin in pouring, without degrading production efficiency.SOLUTION: A molten metal entry prevention device used in a molding flask alignment structure including: a guide hole for an upper molding flask and a guide hole for a lower molding flask through which a guide rod continuously penetrates in flask alignment; an upper flask bush which is provided on a lower opening as a mating surface side of the guide hole for the upper molding flask; and a lower flask bush which is provided on an upper opening as a mating surface side of the guide hole for the lower molding flask, and is fit to the upper frame bush in flask alignment of the upper and lower molding flasks, includes a cover member which is provided above the upper and lower molding flasks in a pouring area, and blocks the upper opening of the guide hole for the upper molding flask from which the guide rod is detached from above, and a blocking device operated to block the upper opening of the guide hole for the upper molding flask with the cover member, while a mold subjected to flask alignment is stopped for pouring.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a molten metal intrusion prevention device and method for preventing molten metal from infiltrating into the positioning bushings of the upper and lower flasks when molten metal is poured into a molded flask. [Background technology]

[0002] Conventionally, a commonly used structure for positioning upper and lower flasks after molding has been as shown in Patent Document 1 (Fig. 1), in which a pin is provided in the upper flask, a hole through which the pin passes and a bushing that fits into the hole are provided in the lower flask, and the pin is inserted into the bushing. However, if the height of the mold convex portion is higher than the height of the pin, or if the mold draft angle is smaller than the pin angle, there is a problem that the pin cannot prevent the upper and lower sand molds from rubbing against each other during frame alignment.

[0003] For this reason, a method was devised, as described in Patent Document 2, in which bushes are provided on both the upper and lower flasks, long frame alignment pins are inserted in advance, and the upper and lower flasks are brought closer together along the frame alignment pins. This restricts the inclination of the frame alignment pin at three points: the upper frame lower bush, the lower frame upper bush, and the lower frame lower bush, making it difficult for the frame alignment pin to incline, thereby preventing the upper and lower sand molds from rubbing against each other during frame alignment. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6064497 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-136196 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the frame alignment method for flask-mounted sand molds in Patent Document 2, there were cases where the molten metal overflowed from the pouring basin on the top surface of the mold during pouring, or splashed during melting, causing the molten metal to enter through the insertion hole for the frame alignment pin on the top side of the upper flask.

[0006] When molten metal enters through the insertion holes of the frame alignment pins, the molten metal adheres to the inside of the bushings of the upper and lower flasks. If the molten metal adheres to the inside of the bushings, the pattern plate pins and the bushings of the upper and lower flasks cannot be fitted together during the molding process, which can cause problems such as tilting the flasks and damaging the molding equipment.

[0007] One possible solution to this problem would be to move the pouring basin away from the insertion holes for the frame alignment pins, but this would reduce the number of castings (products) that can be placed in one mold, which would reduce production efficiency.

[0008] The present invention has been made in consideration of the above-mentioned conventional problems, and its purpose is to provide a molten metal intrusion prevention device and a molten metal intrusion prevention method that can prevent molten metal from entering the insertion hole of a frame alignment pin when pouring the molten metal into the insertion hole without reducing production efficiency. [Means for solving the problem]

[0009] A first aspect of the molten metal intrusion prevention device of the present invention is a device for use in a flask joining structure comprising: a top flask guide hole and a bottom flask guide hole, which are drilled in the upper and lower flasks, respectively, and through which a single guide rod passes successively when the flasks are joined; a top flask bushing provided at the lower opening, which is the mating surface side of the top flask guide hole; and a bottom flask bushing provided at the upper opening, which is the mating surface side of the bottom flask guide hole, and which fits into the top flask bushing when the upper and lower flasks are joined.

[0010] In the pouring area, a cover member is provided above the upper and lower flasks, for closing from above the upper opening of the upper flask guide hole from which the guide rod has been removed, and a closing device is provided which operates to close the upper opening of the upper flask guide hole with the cover member at least during pouring when transportation of the mated flask mold is stopped.

[0011] This allows the upper opening to be sealed without interrupting the pouring process, thereby preventing the molten metal from entering the frame alignment pin insertion hole during pouring without reducing the production efficiency of pouring the molten metal.

[0012] According to the second aspect of the molten metal intrusion prevention device of the present invention, in the device of the first aspect, the cover member and the closing device are provided at a plurality of locations corresponding to the stopping positions of the upper opening, which moves intermittently at a predetermined pitch as the upper and lower flasks are framed together.

[0013] With this, the upper opening is closed by the cover member during the pouring operation, when the movement of the upper and lower flasks is stopped and there is a possibility that molten metal may enter. In this way, the movement operation and the pouring operation can be carried out efficiently while preventing the entry of molten metal.

[0014] According to the third aspect of the molten metal intrusion prevention device of the present invention, in the device of the second aspect, the blocking device comprises a rotating shaft extending parallel to the conveying path, and a rotating arm that protrudes in a direction intersecting the rotating shaft to correspond to the upper opening and rotates by the rotating shaft, and the cover member is provided on the tip side of the rotating arm.

[0015] This allows the pouring operation using a ladle and the operation of the molten metal intrusion prevention device to be carried out quickly and safely without interference.

[0016] According to a fourth aspect of the molten metal intrusion prevention device of the present invention, in the device of the third aspect, the cover member is provided on the tip side of the rotating arm so as to be movable up and down.

[0017] By making the cover member movable, even if there is some variation in the height of the molding flask, the cover member moves freely along the top surface of the upper opening, so the upper opening can be reliably closed.

[0018] According to the fifth aspect of the molten metal intrusion prevention device of the present invention, in the device of the fourth aspect of the present invention, a bridge member is provided at the tip end of the rotating arm so as to span the space between the upper and lower adjacent molding flasks that are lined up along the conveying path, and the cover members are provided in pairs on the bridge member corresponding to the upper openings of the adjacent upper and lower molding flasks.

[0019] This allows the pair of cover members to straddle and cover the upper openings of the adjacent upper and lower flasks, resulting in a compact structure and reducing equipment costs.

[0020] According to the sixth aspect of the molten metal intrusion prevention device of the present invention, in the device of the third aspect of the present invention, the rotating shaft is supported and rotated by a plurality of support rollers which have an axis parallel to the rotating shaft and support the outer periphery of the rotating shaft so as to surround it.

[0021] This allows for the provision of multiple support rollers at predetermined intervals along the rotating shaft, which support and roll on the outer circumferential surface of the rotating shaft, eliminating the need to provide localized steps in the bearing portion of the rotating shaft, and allowing the material to be used as is. Furthermore, since there is no need to insert the rotating shaft into the bearing, the rotating shaft can be easily attached and detached, reducing equipment costs and improving maintenance workability.

[0022] According to the seventh aspect of the present invention, the molten metal intrusion prevention method uses the molten metal intrusion prevention device of the first aspect of the present invention, and the cover members are provided at multiple locations corresponding to the stopping positions of the upper opening, which is frame-aligned and moves intermittently at a predetermined pitch, and a blocking device is used to close the upper opening of the upper flask guide hole with the cover members while the aligned mold is stopped for pouring molten metal.

[0023] This allows the upper opening to be sealed without interrupting the pouring process, thereby preventing the molten metal from entering the frame alignment pin insertion hole during pouring without reducing the production efficiency of pouring the molten metal. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a plan view showing an outline of an embodiment of a molten metal intrusion prevention device of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along the line II-II in FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along the arrows VV in FIG. 4. [Figure 6] FIG. 10 is a view showing a state in which the cover member is held at the raised end and the upper opening is open. [Figure 7] FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. [Figure 9] FIG. 2 is an enlarged plan view showing the support device. [Figure 10] 10 is a view taken along the arrow XX in FIG. 9. [Figure 11] FIG. 1 is a view taken along the line XI-XI in FIG. [Figure 12] 12 is a view taken along the arrows XII-XII in FIG. 11. DETAILED DESCRIPTION OF THE INVENTION

[0025] (Embodiment) An embodiment of a molten metal intrusion prevention device according to the present invention will be described below with reference to FIGS. As shown in Figure 1, the molten metal intrusion prevention device 1 is installed parallel to the transfer path CP in the pouring area PA. As shown in Figure 2, on the transfer path CP, rails R are laid on stands ST installed on the floor BG, and multiple carts TL are lined up in a row on the rails R. Each cart TL carries upper and lower flasks ULF, which are stacked one on top of the other, and molten metal is poured into the upper and lower flasks ULF from the ladle LD.

[0026] A work deck WD is provided on the opposite side of the conveying path CP from the position where the molten metal intrusion prevention device is located, and a worker W can pour the molten metal on the work deck WD. As shown in Figure 3, a hoist crane HC is installed above the work deck WD, allowing the ladle LD to be hoisted and moved.

[0027] In Figure 1, the horizontal direction extending from left to right is referred to as the X-axis direction, and the horizontal direction perpendicular to the X-axis direction is referred to as the Y-axis direction. Furthermore, if a tangible object has an imaginary center line, the side closer to the center line is referred to as the inside, and the side farther from the center line is referred to as the outside. Furthermore, when something is being transported, the side that is the starting point of the transport is referred to as the upstream side, and the side that is the end point of the transport is referred to as the downstream side.

[0028] The molten metal intrusion prevention device 1 of the embodiment is used in the following flask fitting structure 2. 4, the flask alignment structure 2 includes a guide hole 2U for a top flask, a guide hole 2L for a bottom flask, a top flask bushing 2BU, and a bottom flask bushing 2BL. The top flask guide hole 2U and the bottom flask guide hole 2L correspond to insertion holes.

[0029] (Guide hole for upper flask) A guide rod (corresponding to a frame alignment pin) not shown in the figure is inserted into the upper flask guide hole 2U when the upper flask UF and the lower flask LF are aligned with each other. As shown in FIGS. 4 and 5, the upper flask guide hole 2U is provided in the center of the Y side of the upper flask UF that extends in the Y-axis direction, toward the inside. The upper flask guide hole 2U has a through hole 2Ui, a medium diameter portion 2Uj, and a large diameter portion 2Uk. The through-hole 2Ui is provided so that a circular opening having a predetermined inner diameter extends continuously in the vertical direction.

[0030] The upper outer edge of the upper opening 2Ua of the upper flask guide hole 2U is formed with a tapered protrusion UCP1 whose outer diameter narrows toward the top. The height of the tapered protrusion UCP1 is the same as the height of the inner edge UFE of the upper flask UF. The upper opening 2Ua is closed by a cover member 3, which will be described later.

[0031] The medium diameter portion 2Uj is continuous with the lower portion of the through hole 2Ui via a first step portion having an annular horizontal surface, and is formed with an inner diameter larger than that of the through hole 2Ui. The large diameter section 2Uk is connected to the lower part of the medium diameter section 2Uj via a second step section with an annular horizontal surface, and has a larger inner diameter than the medium diameter section 2Uj. The medium diameter section 2Uj and the large diameter section 2Uk form the lower opening 2Ub of the cope flask guide hole 2U. The lower outer edge of the lower opening 2Ub of the cope flask guide hole 2U is formed by a cylindrical protrusion UCP2 that protrudes downward.

[0032] (Upper frame bush) An upper frame bushing 2BU is inserted into the lower opening 2Ub of the upper flask guide hole 2U.

[0033] The upper frame bush 2BU is a shock-absorbing component, and is made of, for example, iron and formed into a substantially cylindrical shape. The upper frame bush 2BU includes an upper cylindrical portion 2BUa, a flange portion 2BUb, and a lower cylindrical portion 2BUc. The outer diameter of the upper cylindrical portion 2BUa is sized to fit snugly against the inner wall of the medium-diameter portion 2Uj of the upper flask guide hole 2U. The outer diameter of the flange portion 2BUb is sized to fit snugly against the inner wall of the large-diameter portion 2Uk, and the upper surface of the flange portion 2BUb abuts against the lower surface of the second stage.

[0034] A lower cylindrical portion 2BUc projects downward from the lower end of the flange portion 2BUb. The inner diameter of the lower cylindrical portion 2BUc is larger than the inner diameter of the flange portion 2BUb, and a step is formed at the lower end of the inner diameter of the flange portion 2BUb. A lower frame bush 2BL, which will be described later, is fitted onto the inner wall of the lower cylindrical portion 2BUc. The inner diameter of the upper frame bushing 2BU is formed to be 2 to 3 mm smaller than the through hole 2Ui of the upper flask guide hole 2U.

[0035] (Guide hole for lower flask) A guide rod (not shown) is inserted into the guide hole 2L for the lower flask when the upper flask UF and lower flask LF are mated. As shown in FIGS. 4 and 5, the guide hole 2L for the drag flask is provided in the center of the Y side of the drag flask LF, which extends in the Y-axis direction, towards the inside. The lower flask guide hole 2L is provided with a circular opening of a predetermined inner diameter that extends continuously in the vertical direction. The upper and lower openings 2La and 2Lb of the lower flask guide hole 2L have inner diameters larger than the inner diameter of the central portion, and lower frame bushings 2BL are fitted into the upper and lower openings 2La and 2Lb.

[0036] (Lower frame bush) As shown in FIG. 4, the lower frame bush 2BL is made of, for example, iron, formed in a substantially cylindrical shape, and includes a large diameter portion 2BLa having a large outer diameter and a small diameter portion 2BLb having an outer diameter smaller than that of the large diameter portion 2BLa.

[0037] The large-diameter portion 2BLa is formed to have a diameter that will not cause play on the inner wall of the upper opening 2La when inserted into the upper opening 2La. The small-diameter portion 2BLb is formed to have a diameter that will fit snugly into the inner wall of the lower cylindrical portion 2BUc of the upper frame bushing 2BU. The small-diameter portion 2BLb protrudes above the upper opening 2La, but the protruding height of the small-diameter portion 2BLb is formed to the same height as the inner edge portion LFE of the lower flask LF. The lower frame bushing 2BL (2BLa, 2BLb) of the lower opening 2Lb is formed in the same manner. The inner diameter of the lower frame bush 2BL is formed to be 2 to 3 mm smaller than the inner diameter of the central portion 2Lm of the lower frame guide hole 2L.

[0038] The following molten metal intrusion prevention device 1 is applied to the flask matching structure 2 configured as above.

[0039] (Molten metal intrusion prevention device) The molten metal intrusion prevention device 1 includes a cover member 3 and a closing device 5. (Cover member) The cover member 3 closes the upper opening 2Ua of the upper flask UF. The cover member 3 includes a cover member main body 3 a, a support screw portion 3 c, a first nut 31 and a second nut 32. The cover member main body 3a is made of, for example, iron and formed in the shape of a truncated cone, and has a support hole 3b formed along a vertical line connecting the center of the upper bottom surface 3au and the center of the lower bottom surface 3ad.

[0040] A support screw portion 3c attached to a cross member 4 (described later) is loosely inserted into the support hole 3b. The support screw portion 3c is a countersunk head screw, and a first nut 31 and a second nut 32 are screwed onto the tip side of the threaded portion where the thread is formed. The first nut 31 and the second nut 32 are fastened in a direction that brings them closer to each other, thereby fixing them to the threaded portion at any position on the threaded portion.

[0041] The cover member 3 is placed on the threaded portion, and a gap 3t of, for example, 2 mm to 7 mm is provided between the lower surface of the crossover member 4 and the upper bottom surface 3au, and the cover member main body 3a is configured to be able to move freely within the range of the gap 3t. In this way, the size of the gap 3t can be adjusted by the first nut 31 and the second nut 32.

[0042] (Watarube) As shown in FIG. 7, the connecting member 4 is provided at the tip of a rotary arm 54, which will be described later, and has two cover members 3 attached thereto for the adjacently arranged upper flasks UF.

[0043] As shown in Fig. 5, the crossover member 4 is made of, for example, iron, formed into a rectangular plate, and provided so as to extend in the X-axis direction. Each corner is chamfered. Mounting holes 4a are provided at both ends, and female threads are threaded into the mounting holes 4a to be mated with the threads of the support screw portion 3c.

[0044] A countersink is formed at the upper opening of the mounting hole 4a. The upper surface of the tip of the rotating arm 54 of the closing device 5 is attached to the lower surface of the central part of the crossover member 4 by, for example, welding.

[0045] (occlusion device) The closing device 5 drives the cover member 3 to open and close the upper opening 2Ua of the upper flask UF. As shown in FIG. 11, the closing device 5 includes an actuator 51, a rotary drive arm 52, a rotary shaft 53, and a rotary arm 54 (see FIG. 6).

[0046] (actuator) The actuator 51 is mounted on a support column SP erected on a base BS, and rotates a rotary drive arm 52. The actuator 51 is, for example, a hydraulic cylinder device, and includes a cylinder 51a and a piston rod 51b. A hydraulic pump (not shown) is connected to the cylinder 51a via an oil supply pipe (not shown), and a solenoid switching valve (not shown) is provided between the cylinder 51a and the hydraulic pump. The operation of the solenoid switching valve is controlled by a control device (not shown).

[0047] 12, the lower portion of the cylinder 51a is mounted to a bracket 51c provided on the side surface of the support column SP. In the assembly, the cylinder 51a is rotatably supported on a support shaft 51d provided on the bracket 51c and extending in the Y-axis direction. The tip end of the piston rod 51b is connected to the tip end of the rotation drive arm 52 via a connecting pin P so as to be rotatable relative to the piston rod 51b.

[0048] In this embodiment, a hydraulic cylinder is used as the actuator 51, but the present invention is not limited to this. For example, an electric actuator can be used.

[0049] (Rotating drive arm) As shown in FIGS. 11 and 12, the base end of the rotary drive arm 52 is attached to a rotary shaft 53 (described later) so as not to be rotatable relative to the base end, and rotates about the rotary shaft 53 within a vertical plane extending in the Y-axis direction. The rotary drive arm 52 is made of, for example, iron and is formed in the shape of a plate that narrows toward the tip. The outer shapes of the tip and base end are rounded and chamfered. The rotary drive arm 52 is attached to one end of the rotary shaft 53 (the left end in FIG. 1).

[0050] (rotation axis) 1, the rotating shaft 53 is provided in parallel to the conveying path CP, and is rotated by the rotary drive arm 52 to rotate the multiple rotating arms 54 as a unit, thereby performing the closing operation of the cover member 3. As shown in FIG. 5, the rotating shaft 53 includes a rotating shaft main body 531 and a shaft coupling 532.

[0051] 1, a plurality of (three in this embodiment) rotating shaft bodies 531 are connected by shaft couplings 532 and extend along the X-axis direction. As shown in FIG. 5, flange-type shaft couplings 532 are used, and the shaft couplings 532 are connected to each other by bolts B and nuts N.

[0052] (Rotating arm) The rotating arm 54 opens and closes the upper opening 2Ua by moving the cover members 3 provided on both ends of the connecting member 4 provided at the tip up and down along the radius of rotation.

[0053] As shown in Figures 4 and 6, the rotating arm 54 is made of, for example, iron, and is formed from a rectangular plate material that extends from the rotating shaft 53 to the upper opening 2Ua of the upper flask UF on the transfer path CP. The height direction of the arm gradually decreases from the base end to the center, and the height direction of the arm is uniform from the center to the tip. A chamfered surface 54a is formed at the lower end of the tip. A cross member 4 is attached to the top surface of the tip along the horizontal direction perpendicular to the rotating arm 54.

[0054] The connected rotary shaft 53 is supported rotatably around its axis by support devices 6 provided at both ends and three locations between them.

[0055] (Support device) As shown in FIGS. 9 and 10, the support device 6 includes a lower divided portion 61, an upper divided portion 62, a support roller 63, and a bolt B. The support device 6 is provided at the upper end of the support column SP.

[0056] 10, the lower divided part 61 is made of, for example, iron and formed in the shape of a rectangular plate, and has a semicircular cutout 61a formed on the upper end surface with its axis extending in the X-axis direction. The semicircular cutout 61a has a diameter that is, for example, 2 to 4 mm larger than the outer diameter of the rotary shaft 53. Female threaded holes 61b into which bolts B, which will be described later, are threaded are formed on both sides of the semicircular cutout 61a. Support rollers 63 are provided on both sides of the lower portion of the semicircular cutout 61a.

[0057] (Top division) 8, the upper divided part 62 is made of, for example, iron and formed in the shape of a rectangular plate, and has a semicircular cutout 62a formed in the lower end surface with its axis extending in the X-axis direction. The semicircular cutout 62a is formed with a diameter that is, for example, 2 to 4 mm larger than the outer diameter of the rotary shaft 53, as shown in FIG.

[0058] Through holes 62b extending vertically on both sides of a semicircular cutout 62a are formed in the upper divided portion 62. A bolt B, which will be described later, is loosely fitted into the through holes 62b. Above the semicircular cutout 62a, one support roller 63 is provided.

[0059] (support roller) As shown in Figure 9, the support roller 63 is configured so that a rotation axis portion 63a is provided parallel to the axis of the semicircular cutouts 61a and 62a, and the outer peripheral end of the roller portion 63b protrudes inside the semicircular cutouts 61a and 62a (see Figure 8).

[0060] As a result, when the rotary shaft 53 is sandwiched between the lower divided portion 61 and the upper divided portion 62, the rotary shaft 53 comes into contact with the outer periphery of the roller portion 63b and is supported. A rotary arm 54 provided with a cover member 3 is connected to the rotary shaft 53 at its base end so as not to be rotatable relative to the rotary shaft 53.

[0061] (Control device) The control device controls the transportation of the carriage TL on which the upper and lower flasks ULF are placed, the opening and closing operation of the cover member 3 by driving the rotary drive arm 52, and the like.

[0062] (Activation) The operation of the molten metal intrusion prevention device 1 configured as above will be described below with reference to FIGS. First, as shown in FIG. 1, a plurality of upper and lower flasks ULF in which molds M have been formed are placed on carriages TL and lined up on the conveying path CP.

[0063] The multiple (ten in this embodiment) rotating arms 54 are set at a predetermined interval (hereinafter referred to as approximately one pitch) taking into consideration the dimension of one pitch, which is the length of the upper and lower flasks ULF in the X-axis direction, and the gap provided between adjacent upper and lower flasks ULF. As shown in FIG. 6, the rotating arm 54 is positioned at the left rotation end in FIG. 6 so that the cover member 3 is positioned above the upper flask UF.

[0064] The plurality of carriages TL carrying the upper and lower flasks ULF are set by a positioning device (not shown) so as to stop between the plurality of adjacent rotary arms 54, respectively.

[0065] The control device drives the rotary drive arms 52 of the closing device 5, causing all of the rotary arms 54 to rotate clockwise in FIG. 4, thereby causing the cover members 3 to close the upper openings 2Ua of the upper flask guide holes 2U.

[0066] The cover members 3 are provided on both ends of a cross member 4 extending in the X-axis direction, and each pair of two covers closes the upper openings 2Ua of the adjacent upper and lower flasks ULF.

[0067] The cover member main body 3a is held in a state where it is loosely fitted into the support screw portion 3c, so that deviations in the vertical position or inclination of the cover member main body 3a relative to the upper opening 2Ua can be compensated for to close the upper opening 2Ua.

[0068] Next, as shown in FIG. 3, the worker W uses the ladle LD to pour the molten metal into the mold M set in the upper and lower flasks ULF.

[0069] During the work of pouring molten metal, the upper opening 2Ua of the upper flask guide hole 2U is closed by the cover member 3, preventing the molten metal from entering. This prevents problems such as the molten metal adhering to the inside of the bushings of the upper and lower flasks, preventing the pattern plate pins from fitting together, or tilting the flask to be fitted.

[0070] Next, the control device drives the rotary drive arms 52 of the closing device 5, causing all of the rotary arms 54 to rotate counterclockwise in FIG. 6, thereby causing the cover member 3 to open the upper opening 2Ua of the upper flask guide hole 2U. Next, the control device moves the carriages on the conveying path CP downstream by approximately one pitch, and positions each carriage between adjacent rotary arms 54. The same process is repeated thereafter.

[0071] The molten metal intrusion prevention device 1 configured as described above is used in a flask matching structure 2 that includes a top flask guide hole 2U and a bottom flask guide hole 2L that are drilled in the upper and lower flasks ULF, respectively, and through which a single guide rod (flask matching pin, not shown) passes in succession when the flasks are matched, a top flask bushing 2BU provided in the lower opening 2Ub, which is the mating surface side of the top flask guide hole 2U, and a bottom flask bushing 2BL provided in the upper opening 2La, which is the mating surface side of the bottom flask guide hole 2L, and that fits into the top flask bushing 2BU when the upper and lower flasks ULF are matched.

[0072] In the pouring area PA, a cover member 3 is provided above the upper and lower flasks ULF, and covers from above the upper opening 2Ua of the upper flask guide hole 2U from which the guide rod has been removed, and a closing device 5 is provided which operates to close the upper opening 2Ua of the upper flask guide hole 2U with the cover member 3 at least during pouring when the transport of the mated flask mold M is stopped.

[0073] This allows the upper opening 2Ua to be blocked without interrupting the pouring process, thereby preventing molten metal from entering the insertion holes for the frame alignment pins (guide rods) (guide holes 2U for the upper flask and 2L for the lower flask) during pouring without reducing the production efficiency of pouring molten metal.

[0074] In this embodiment, the cover members 3 and closing devices 5 are provided at a plurality of locations corresponding to the stopping positions of the upper opening 2Ua, which moves intermittently at a predetermined pitch with the upper and lower flasks ULF framed together.

[0075] With this, during the pouring operation, when the movement of the upper and lower flasks ULF stops and there is a possibility that molten metal may enter, the upper opening 2Ua is closed by the cover member 3. In this way, the movement operation and the pouring operation can be carried out efficiently while preventing the entry of molten metal.

[0076] In addition, in this embodiment, the blocking device 5 includes a rotating shaft 53 extending parallel to the conveying path CP, and a rotating arm 54 that protrudes in a direction intersecting the rotating shaft 53 to correspond to the upper opening 2Ua and rotates by the rotating shaft 53, and a cover member 3 is provided on the tip side of the rotating arm 54.

[0077] This allows the pouring operation using the ladle LD and the movement of the molten metal intrusion prevention device 1 to be carried out quickly and safely without interference.

[0078] In this embodiment, the cover member 3 is provided on the tip side of the rotation arm 54 so as to be movable up and down.

[0079] According to this, by making the cover member 3 movable, even if there is some fluctuation in the height of the molding flask, the cover member 3 moves along the upper surface of the upper opening 2Ua, so that the upper opening 2Ua can be reliably closed.

[0080] In this embodiment, a crossover member 4 is provided at the tip end of the rotating arm 54 so as to span the space between adjacent upper and lower flasks ULF that are aligned along the conveying path CP, and a pair of cover members 3 are provided on the crossover member 4 in correspondence with the upper openings 2Ua of the adjacent upper and lower flasks ULF.

[0081] This allows the pair of cover members 3 to straddle and close the upper openings 2Ua of the adjacent upper and lower flasks, resulting in a compact structure and reducing equipment costs.

[0082] In this embodiment, the rotary shaft 53 is supported and rotated by a plurality of support rollers 63 that have an axis parallel to the rotary shaft 53 and surround the outer periphery of the rotary shaft 53 .

[0083] According to this, by providing a plurality of support rollers 63 that roll on the outer circumferential surface of the rotating shaft 53 at predetermined intervals along the rotating shaft 53, there is no need to provide localized steps in the bearing portion of the rotating shaft 53, and the material can be used as is. Also, since there is no need to insert the rotating shaft 53 into a bearing, the rotating shaft 53 can be easily attached and detached, which not only reduces equipment costs but also improves maintenance workability.

[0084] In this embodiment, according to the method for preventing molten metal from entering, cover members 3 are provided at multiple locations corresponding to the stopping positions of the upper opening 2Ua, which is frame-aligned and moves intermittently at a predetermined pitch, and a blocking device 5 blocks the upper opening 2Ua of the upper flask guide hole 2U with the cover members 3 while the flask-aligned mold M is stopped for pouring molten metal.

[0085] This allows the upper opening 2Ua to be blocked without interrupting the pouring process, thereby preventing molten metal from entering the frame alignment pin (guide rod) insertion hole (guide hole for upper flask) during pouring without reducing the production efficiency of pouring molten metal.

[0086] In this embodiment, the support rollers 63 are arranged in three locations surrounding the rotation shaft 53, but this is not limitative. For example, the upper support roller may be removed to reduce the number of locations to two. Alternatively, the support rollers 63 may be arranged in four locations surrounding the rotation shaft. Furthermore, although the upper and lower flasks ULF placed on the carriage TL are intermittently conveyed by approximately one pitch each, this is not limitative and may be conveyed by, for example, two or more pitches each.

[0087] Furthermore, the support hole 3b of the cover member body 3a of the cover member 3 is loosely fitted into a support screw portion 3c whose upper end is attached to the crossover member 4. However, this is not limited to this. For example, the crossover member 4 and the cover member body 3a may be connected by a helical spring (compression spring). By connecting them by a helical spring, even when the cover member body 3a abuts against the upper opening 2Ua at an angle, the cover member body 3a can be tilted relative to the crossover member 4 to close the upper opening 2Ua of the upper flask guide hole 2U.

[0088] The present invention is not limited to the above-described embodiments shown in the drawings, but can be modified appropriately within the scope of the present invention. [Explanation of symbols]

[0089] 1: Molten metal intrusion prevention device, 2: Flask alignment structure, 2L: Lower flask guide hole (insertion hole), 2U: Upper flask guide hole (insertion hole), 2BL: Lower flask bushing, 2BU: Upper flask bushing, 2Ua: Upper opening, 3: Cover member, 3c: Support screw portion, 31: First nut, 32: Second nut, 4: Crossover member, 5: Closing device, 53: Rotating shaft, 54: Rotating arm, 6: Support device, 63: Support roller, M: Mold, PA: Pouring area, ULF: Upper and lower flasks.

Claims

1. a guide hole for the upper flask and a guide hole for the lower flask, which are drilled in the upper and lower flasks, respectively, and through which a guide rod passes in succession when the flasks are aligned; an upper flask bushing provided at a lower opening on the mating surface side of the upper flask guide hole; a lower flask bushing provided at an upper opening on the mating surface side of the lower flask guide hole, the lower flask bushing fitting into the upper flask bushing when the upper and lower flasks are mated, a cover member provided above the upper and lower flasks in the pouring area, for covering from above the upper opening of the upper flask guide hole from which the guide rod has been removed; a closing device that operates to close the upper opening of the upper flask guide hole with the cover member at least during pouring when transportation of the mated mold is stopped. Molten metal intrusion prevention device.

2. The cover members and the closing devices are provided at a plurality of locations corresponding to the stopping positions of the upper opening, which moves intermittently at a predetermined pitch while the upper and lower flasks are aligned.

10. The apparatus of claim 1.

3. The closing device includes a rotary shaft extending parallel to the conveying path along which the upper and lower flasks are conveyed; a rotary arm that is provided on the rotary shaft in a direction intersecting the rotary shaft so as to project in correspondence with the upper opening and that rotates with the rotary shaft; The cover member is provided on the tip side of the rotating arm.

3. The apparatus of claim 2.

4. The cover member is provided on the tip side of the rotating arm so as to be movable up and down.

4. The apparatus of claim 3.

5. a bridge member is provided at the tip end of the rotary arm so as to span the space between the upper and lower flasks adjacent to each other along the conveying path; The cover members are provided in pairs on the bridge member in correspondence with the upper openings of the adjacent upper and lower flasks.

4. The apparatus of claim 3.

6. The rotating shaft is supported by a plurality of support rollers having an axis parallel to the rotating shaft and in contact with the outer periphery of the rotating shaft.

4. The apparatus of claim 3.

7. A molten metal intrusion prevention method using the molten metal intrusion prevention device according to claim 1, The cover member is provided at a plurality of locations corresponding to stop positions of the upper opening, which is intermittently moved by a predetermined pitch while being framed, The closing device closes the upper opening of the upper flask guide hole with the cover member while the mated mold is stopped for pouring. Method for preventing molten metal from entering.

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