Device for pulling out cast mold and method for pulling out cast mold

Abstract

The invention provides a casting mold pulling-out device capable of eliminating problems in installation space and reducing equipment cost and operation cost in a casting mold pulling-out device using an electric motor. The device for pulling out the cast mold is provided with: an electric motor; a lifting frame for pressing the upper surface of the sand mold part of the cast mold so as to enable the sand mold part to descend; an arm member which is provided with a fulcrum serving as the center of rotation, a point of force to which the driving force of the electric motor is applied, and a point of action which rotates on the basis of the driving force applied to the point of force, the point of action being disposed above the lifting frame, at least the point of force being disposed at a position offset from the upper side of the lifting frame, and which swings in a vertical plane; a driving force transmission mechanism provided between the electric motor and the force point of the arm member; a link member that connects the point of action of the arm member and the lifting frame above the lifting frame; and a lowering restriction device that restricts the lowering of the sand box by coming into contact with the sand box when the raising / lowering frame is lowered.

Description

TECHNICAL FIELD

[0001] The present application relates to a mold drawing device that draws a cast mold, which has been cast, from a sand box, and a mold drawing method using the device. BACKGROUND

[0002] In the past, as a method of drawing a cast mold, which has been cast, from a sand box, there has been a method of drawing the cast mold downward from the sand box by a cylinder device. This method drops the cast mold, which has been cast, onto a recovery device, such as a shaking and dropping machine or a vibrating conveyor, and transports it to a next process of performing burr removal and inspection.

[0003] Further, this method requires a large output when drawing the cast mold from the sand box, and therefore, a hydraulic cylinder is generally used.

[0004] However, the hydraulic cylinder requires a hydraulic unit for operating the cylinder and controlling the cylinder, and there is a problem that the amount of electricity increases because there are many cases where a hydraulic pump motor is always operated in production.

[0005] Therefore, in recent years, a de-hydraulic cylinder has been researched as an energy saving target based on a reduction in the use of electricity, and the electrification of actuators has been promoted.

[0006] The inventors have considered the characteristics at the time of drawing out the cast mold that has been cast, and have proposed a drawing-out device for a cast mold that has been cast (jolt drop) as in Patent Literature 1.

[0007] This drawing-out device for a cast mold that has been cast is excellent in the functions required at the time of drawing out, that is, in the initial stage of drawing out, a short stroke is made but a large pressure is generated, and thereafter, in order to draw out the cast mold (sand mold portion) downward, a large force is not required but a slightly long stroke is generated.

[0008] PRIOR ART DOCUMENTS PATENT LITERATURE Patent Literature 1: Japanese Patent Application No. 2022-132217 SUMMARY PROBLEMS TO BE SOLVED BY THE INVENTION However, the drawing-out device for a cast mold that has been cast of Patent Literature 1 is configured such that the main part of a drive mechanism that transmits driving force from an electric motor as a drawing-out force is limited to be arranged directly above a lifting frame that draws out the cast mold. Therefore, there is a problem that a spatial restriction occurs when the device is installed. In addition, there is a demand to make the electric motor a small-torque electric motor in order to achieve a reduction in equipment cost and a reduction in operating cost.

[0009] The present application has been made in view of the above-described conventional problems, and has an object to provide a casted mold extraction device and a casted mold extraction method capable of eliminating the problem of installation space and reducing equipment cost and operation cost in a casted mold extraction device using an electric motor.

[0010] Means for solving the problem The casted mold extraction device according to the first aspect of the present application includes: an electric motor; a lifting frame that presses an upper surface of a sand mold portion of an inner side of a sand box of a casted mold to enable the sand mold portion to descend; an arm member that extends in a lateral direction and is provided with a fulcrum that is a center of rotation, a force point to which a driving force of the electric motor is applied, and an action point that rotates based on the driving force applied to the force point, the action point being disposed above the lifting frame, and at least the force point being disposed at a position deviated from above the lifting frame, the arm member oscillating in a virtual vertical plane; a driving force transmission mechanism provided between the electric motor and the force point of the arm member; a link member that extends in an up-and-down direction above the lifting frame and links the action point of the arm member and the lifting frame; and a descent restriction device that abuts against the sand box to restrict descent of the sand box when the lifting frame descends.

[0011] According to this, it is possible to dispose the force point PF around the main driving mechanism at a position deviated from directly above the position at which the casted mold is pushed out, and it is possible to eliminate the problem of the restriction of installation space. Further, the arm member is configured to function as a lever, and thus it is possible to use an electric motor with small torque at the force point, it is possible to select a low-cost electric motor, and it is possible to reduce equipment cost and operation cost during use.

[0012] The casted mold extraction device according to the second aspect of the present application, in the device according to the first aspect, the driving force transmission mechanism includes: a first mechanism that generates a force required to offset the sand mold portion formed in the sand box downward from the sand box; and a second mechanism that further moves the sand mold portion offset by the first mechanism downward, the force generated by the first mechanism for offsetting being greater than the force generated by the second mechanism for moving downward, and the speed at which the sand mold portion is moved downward by the second mechanism being faster than the speed at which the sand mold portion is offset by the first mechanism.

[0013] According to this, with respect to the load to the portion of the force point using the lever principle, in the case of offsetting the sand mold portion formed in the sand box downward from the sand box, which requires a large force, the first mechanism is used. Also, in the case of moving the sand mold portion offset by the first mechanism downward, this is performed by the second mechanism with a high speed.

[0014] ​Thus, the high-load region in which the output of the electric motor itself as the drive source is not changed and is decreased at a low speed and the low-load region in which the output is decreased at a high speed can be efficiently used in correspondence with the load required for the extraction of the mold.

[0015] The cast mold extraction device according to the third aspect of the present application, in the device according to the second aspect, the first mechanism includes a rotating arm whose front end portion rotates at a predetermined radius by driving of the electric motor, and the second mechanism includes a first link member whose base end portion is connected to the front end portion of the rotating arm, and the first link member is wound around the rotating arm so that the front end portion of the first link member rotates at a radius larger than the radius at which the rotating arm rotates.

[0016] According to this, the first link member is wound around by rotating the rotating arm at the high-load region in which the speed is low. Also, the force point of the first link member can be achieved by the first link member whose front end portion is larger than the radius at which the rotating arm rotates being wound around the rotating arm at the low-load region in which the speed is high.

[0017] The cast mold extraction device according to the fourth aspect of the present application, in the device according to the first aspect of the present application, in the arm member, the fulcrum is provided between the force point and the action point, and the fulcrum includes two fulcrums of a first fulcrum and a second fulcrum disposed at a position closer to the force point than the first fulcrum, the first fulcrum is used when the sand mold portion formed in the sand box is offset downward from the sand box, and the second fulcrum is used when the offset sand mold portion is further moved downward while being switched from the first fulcrum.

[0018] According to this, in the case of using the first fulcrum using the same arm member, the action point is close and the force point is far compared to the second fulcrum, and thus according to the principle of a lever, the distance of movement is short at the action point, but a large force is easily generated.

[0019] In the case of using the second fulcrum, it is difficult to generate a large force at the action point, but the distance of movement can be greatly ensured, and the moving speed downward can be accelerated.

[0020] The cast mold extraction device according to the fifth aspect of the present application, in the device according to the fourth aspect of the present application, in the first fulcrum and the second fulcrum, a roller having a rotation shaft extending in a direction orthogonal to the vertical plane in which the arm member swings, and a receiving portion provided with a semilunar recess corresponding to the outer periphery of the roller are provided, and the outer periphery of the roller is supported by the semilunar recess so as to be detachable in the vertical direction.

[0021] Accordingly, with a freely rotating roller and a receiving part corresponding to the shape of the roller, even when the first fulcrum and the second fulcrum are respectively the fulcrums, the rotation center of the arm member will not become eccentric. The first fulcrum and the second fulcrum, which do not produce the aforementioned eccentricity, can be easily and smoothly switched.

[0022] According to the sixth aspect of the apparatus of the present invention, in the casting mold removal device of the fifth aspect of the present invention, a roller guide is provided at the first fulcrum to guide the track of the roller moving away from the receiving part.

[0023] Accordingly, when the effective fulcrum is switched to the second fulcrum, the roller that becomes the first fulcrum moves away from the receiving part, but since the movement track is restricted by the roller guide, stable and safe movement can be carried out.

[0024] According to the seventh aspect of the present invention, the casting mold removal device of the first aspect of the present invention includes an upward force generating device that generates an upward force that reduces the downward force generated by the weight of the lifting frame and the connecting rod member at the point of action of the arm member.

[0025] If the component assembly, including the lifting frame and connecting rod, experiences a large downward force due to its own weight, there is a risk that the lowering speed of the lifting frame may exceed the rotational speed of the drive shaft during the process of lowering the mold after casting. In this case, it may hinder the operation of the drive transmission mechanism.

[0026] Specifically, the rotating arm, the first link member, and the second link member are smoothly wound from their state after being linearly elongated by the rotation of the rotating arm.

[0027] However, if the descent speed of the lifting frame is faster than the rotation speed of the rotating arm, it cannot maintain a straight extension. Due to loosening, bending occurs between the rotating arm and the first link member, and between the first link member and the second link member, hindering the smooth winding action.

[0028] The upward force generating device can prevent the descent speed of the lifting frame from being faster than the rotation speed of the rotating arm, thus achieving a smooth winding action.

[0029] According to the eighth embodiment of the present invention, the casting mold removal device, in the seventh embodiment of the present invention, generates an upward force by means of the gravity of a hammer via a pulley.

[0030] Therefore, without setting up a device to generate a dedicated driving force, the downward force affecting the operation of the driving force transmission mechanism can be reduced by using a simple mechanism that utilizes the gravity of the hammer.

[0031] According to the ninth aspect of the present invention, the mold removal device after casting is completed, in the third aspect of the present invention, the rotating arm, the arm member, and the connecting rod member move on the same plane.

[0032] Accordingly, the rotating arm, the arm component, and the connecting rod component can be compactly configured, thereby achieving space saving.

[0033] The casting mold removal method according to the tenth aspect of the present invention is a casting mold removal method using the apparatus of the first aspect. The casting mold removal method includes the following steps: an offset step, in which the sand mold portion is offset relative to the sand mold portion in the vertical direction in order to remove the sand mold portion from the sand box; and a downward movement step, in which the sand mold portion after being offset by the offset step is moved downward by a force smaller than that offset by the offset step and at a speed faster than that offset by the offset step.

[0034] Therefore, for loads applied to points of force utilizing the lever principle, a large force can be obtained through an offset process that moves the sand mold portion formed within the sand box upwards from the sand box. Furthermore, a downward movement process that moves the offset sand mold portion downwards can achieve a high speed. This enables a highly efficient operation suitable for mold removal. Attached Figure Description

[0035] Figure 1 This is a schematic diagram viewed from the front side, showing a first embodiment of the casting-completed mold removal device of the present invention through a partial sectional view.

[0036] Figure 2 yes Figure 1 Sectional view in direction II-II.

[0037] Figure 3 This is a top-down view of the pulley's outline.

[0038] Figure 4 yes Figure 1 Sectional view in direction IV-IV.

[0039] Figure 5 yes Figure 1 VV-direction sectional view in the middle.

[0040] Figure 6 This is a diagram showing the state of the rotating arm after it has been rotated 180 degrees from its initial position.

[0041] Figure 7 This diagram shows the state in which the rotating arm rotates 360 degrees from its initial position, disassembling the sand mold and causing the casting to fall.

[0042] Figure 8 This is a schematic diagram viewed from the front side, showing a second embodiment of the casting-completed mold removal device of the present invention through a partial sectional view.

[0043] Figure 9 This diagram shows the state in which the rotating arm rotates 180 degrees from its initial position, pulling out the sand mold and causing the casting to fall. Detailed Implementation

[0044] (First Implementation) The following is based on Figures 1 to 7 The first embodiment of the casting mold removal device according to the present invention will be described. In addition, with Figure 1 The horizontal direction extending left and right is the X-axis, and the horizontal direction orthogonal to the X-axis is the Y-axis. Furthermore, when considering a virtual centerline in a tangible object, the side closer to the centerline is considered the inner side, and the side farther from the centerline is considered the outer side.

[0045] like Figure 1 As shown, the mold removal device 1 after casting is completed in the embodiment includes a support frame 2, an electric motor EM, a drive force transmission mechanism 3, an arm component 4, a connecting rod component 5, a lifting frame 6, and a descent restriction device 7.

[0046] (Support stand) The support frame 2 supports the electric motor EM and the shaft support member 25 on its upper surface. The support frame 2, for example, is made of iron and includes a support column 21, an upper support platform 23, an upper support column 24, and a top plate 22. Figure 1 As shown, the upper part of the support frame 2 is formed into a two-stage stepped shape that increases in height on the left side in the X-axis direction.

[0047] The support column 21 is made of iron and is formed into a square-section rod. Four of them are erected from the ground BF and extend to the height of the upper support platform 23, which will be described later.

[0048] The upper support platform 23 is made of, for example, iron and formed from a rectangular sheet of paper, and is horizontally arranged such that its long side extends along the X-axis. The upper support platform 23... Figure 1 The two corners on the left side are respectively connected to the front end of the left-side pillar 21.

[0049] The upper support platform 23 has: a large opening 2a through which the lifting frame 6 described later passes; and a small opening 2b through which the first connecting member 31 and the second connecting member 32 described later pass.

[0050] In the large opening 2a, the opening in the X-axis direction is formed with a length obtained by subtracting approximately one length of the support 21 from the length between the two supports 21 arranged along the X-axis direction, and the opening in the Y-axis direction is formed with a length between the two supports 21 arranged along the Y-axis direction (see reference). Figure 2 ).

[0051] The small opening 2b is formed as a rectangle extending along the X-axis. The electric motors EM are arranged in pairs, separated by the small opening 2b (see reference). Figure 5 ).

[0052] (upper pillar) like Figure 1 As shown, the upper support column 24 is erected on the upper support platform 23 and supports the top plate 22.

[0053] Upper support 24 Figure 1 In the middle, the two on the left are located at the corner of the upper support platform 23, and the two on the right are located adjacent to the opening end of the large opening 2a.

[0054] The front end of each upper support column 24 is connected to the lower corner of the top plate 22.

[0055] (roof) The top plate 22 supports the shaft support member 25, the upward force generating device 8, and the guide part 64. The top plate 22 is made of iron, for example, and is formed from a rectangular thick plate.

[0056] like Figure 2 As shown, the top plate 22 is provided with a first opening 2c for the connecting rod member 5 to pass through and a second opening 2d for the rope 83 of the pulley 81 to pass through.

[0057] The first opening 2c is located in the top plate 22, slightly offset to the right from the center in the X-axis direction (see reference). Figure 5 It is formed into a rectangle that is slightly longer in the Y-axis direction.

[0058] like Figure 2 As shown, the second opening 2d is positioned on both sides of the cylindrical portion 64a that clamps the first opening 2c and the guide portion 64 along the Y-axis direction. The second opening 2d is formed by small circular holes arranged along the Y-axis direction.

[0059] On support frame 2 Figure 1 The lower stepped surface on the right side of the small opening 2b, at the end of the openings arranged along the Y-axis, such as... Figure 4 As shown, bearing components 105 are respectively provided. These bearing components 105 support the drive rotating shaft EMb, which will be described later, allowing it to rotate freely. Within the bearing components 105... Figure 4 The bearing component 105 on the right side is provided with a limiting roller 105a, which will be described later.

[0060] exist Figure 4 In the middle, a rotation angle sensor (not shown) is provided on the left side arranged along the bearing component 105. It detects the rotation angle, rotation direction and rotation speed of the rotating arm 30 and sends them to the control device (not shown).

[0061] (Electric motor) like Figure 4 As shown, two electric motors EM are positioned opposite each other on the output shaft EMa side and fixed to the upper support platform 23. For example, servo motors can be used as the electric motors EM. When using two electric motors EM to swing the arm member 4, in order to synchronously control these electric motors EM, it is preferable that one of the two electric motors EM is driven as the main motor and the other as the auxiliary motor. Alternatively, depending on the situation, an inverter-controlled motor can also be used as these electric motors EM.

[0062] The output shafts EMa of the two electric motors EM are connected to a drive rotating shaft EMb via a connector.

[0063] In the drive rotating shaft EMb, the paired rotating arms 30 (described later) arranged along the direction of extension of the drive rotating shaft EMb are assembled so that they cannot rotate relative to each other. The rotating arms 30 form part of the drive force transmission mechanism 3 described later.

[0064] (Drive force transmission mechanism) The driving force transmission mechanism 3 transmits the driving force of the electric motor EM to the arm component 4.

[0065] like Figure 1 As shown, the driving force transmission mechanism 3 of the first embodiment includes a rotating arm 30, a first connecting rod member 31, and a second connecting rod member 32.

[0066] (Rotating arm) The rotating arm 30, for example, positions two oval-shaped iron plates opposite each other. Figure 4 As shown, the drive shaft EMb is circumferentially mounted on the output shaft EMa of the two electric motors EM, and cannot be rotated relative to it. Figure 1 As shown, the elliptical plates of the rotating arm 30 are formed with a sharp angle at one end to form a top, and a semi-disc-shaped protrusion at the other end to form part of the first connecting part FCP.

[0067] The drive shaft EMb is rotatably supported on a bearing member 105 fixed to the upper support platform 23 and equipped with ball bearings (see reference). Figure 4The bearing members 105 are arranged in pairs across the rotating arm 30, and a limiting roller 105a is provided protruding from one of the bearing members 105. The limiting roller 105a is configured to contact the arcuate portion ASP of the first connecting rod member 31 (described later) to guide the rotation of the first connecting rod member 31.

[0068] The first connecting part FCP connects the rotating arm 30 to the first connecting rod member 31, which will be described later. For example... Figure 4 As shown, in the first connecting part FCP of the rotating arm 30, connecting holes (not shown) are respectively provided in the two plates, and the shaft pin AP passes through the connecting holes. The shaft pin AP passes through the lower connecting hole (not shown) of the first connecting rod member 31, which will be described later, and supports the first connecting rod member 31 relative to the rotating arm 30 so that it can rotate.

[0069] like Figure 1 As shown, at one end of the top of the rotating arm 30, a locking portion LP is formed on the rotational direction side when the rotating arm 30 winds around the first connecting rod member 31. The locking portion LP has a straight edge extending from the top to the lower portion, abutting against the locking portion LEP of the first connecting rod member 31 (described later). By abutting the locking portion LEP against the locking portion LP in this manner, the first connecting rod member 31 can be neatly wound onto the rotating arm 30.

[0070] (First link component) The first link member 31 connects the rotating arm 30 to the second link member 32.

[0071] The first link member 31 is made of iron, for example, and is formed from a single sheet of plate.

[0072] like Figure 4 As shown, the first link member 31 is configured such that its end, which connects to the rotating arm 30, is clamped by the two plates of the rotating arm 30. A lower connecting hole (not shown) is formed in the first connecting portion FCP on the rotating arm 30 side of the first link member 31, and a bearing is provided in the lower connecting hole (not shown) to support the shaft pin AP for free rotation. The distance L1 from the center of the drive rotating shaft EMB to the center of the lower connecting hole (the center of the first connecting portion FCP) is the rotation radius of the rotating arm 30 (see reference). Figure 6 Rotating arm 30 is equivalent to the first mechanism.

[0073] like Figure 1 As shown, the end of the first link member 31 that connects to the rotating arm 30 is formed by bending along the winding direction. A recess 31a is formed on the inner periphery of the bent end of the first link member 31 in a manner that imitates the outer periphery shape of the drive rotating shaft EMb.

[0074] The outer peripheral edge of the first connecting rod member 31, when wound, has an arc-shaped portion ASP. This arc-shaped portion ASP constitutes part of the circumference when rotating around the drive rotating shaft EMb, and is formed on the bearing member 105 to guide the rotation of the limiting roller 105a. The limiting roller 105a is brought into contact in a rotating manner to guide the rotation of the first connecting rod member 31 smoothly.

[0075] The first link member 31 forms a straight-extending arm AM on the side of the second link member 32, such as... Figure 1 As shown, an upper connecting hole (not shown) is provided at the front end of the arm AM. A connecting hole (not shown) is provided at the end of the second link member 32 on the side of the first link member 31, which will be described later. The upper connecting hole at the front end of the arm AM, the connecting hole at the end of the second link member 32 on the side of the first link member 31, the shaft pin AP communicating with these upper connecting holes, and the connecting holes constitute the second connecting part SCP.

[0076] A locking portion LEP, protruding along the Y-axis direction on both sides of the plate, is provided at the middle of the arm AM of the first link member 31. The locking portion LEP is formed in the shape of a square column. The locking portion LEP, when the rotating arm 30 has rotated 180 degrees from its initial position, such as... Figure 6 As shown, upon contact with the locking part LP, rotation of the first link member 31, centered on the drive rotation shaft EMb, begins. The radius of rotation of the first link member 31 is the length L3 from the center of the drive rotation shaft EMb to the center of the second connecting part SCP (see reference). Figure 6 L3 is the length obtained by subtracting L1 from L2, the length from the center of the first connecting part FCP to the center of the second connecting part SCP (see reference). Figure 1 as well as Figure 6 The first link member 31 is equivalent to the second mechanism.

[0077] (Second link component) like Figure 1 as well as Figure 4 As shown, the second link member 32 connects the two boomerang-shaped bent plates BM into one piece through a short cylindrical connecting member CM.

[0078] Connecting holes (not shown) are formed at the upper end of the second link member 32. A third connecting part TCP is formed by connecting holes (not shown) provided at the force point PF of the arm member 4 and shaft pins AP communicating with these connecting holes. Ball bearings are provided in the connecting holes provided at the force point PF of the arm member 4, and the arm member 4 and the second link member 32 are rotatably connected relative to each other.

[0079] (Arm component) like Figure 1As shown, in the first embodiment, the arm member 4 has an action point PA between the force point PF that is connected to the second connecting rod member 32 and the fulcrum F of the shaft support member 25 that is erected on the upper left end of the top plate 22 of the support frame 2.

[0080] Arm member 4 is, for example, a slender plate made of iron, with its width gradually increasing from both ends toward the portion corresponding to the point of application PA located in the central region. Arm member 4 extends laterally such that the force point PF and the fulcrum F are laterally offset from the connecting member 5 located directly below the point of application PA. Therefore, "extending laterally" in this application means that arm member 4 is configured in such a way that the force point PF and the fulcrum F located on arm member 4 can be offset from the connecting member 5.

[0081] A connecting hole (not shown) is provided at the force point PF corresponding to arm member 4, and a connecting hole (not shown) is provided at the point of action PA. Ball bearings are provided in these connecting holes, for example.

[0082] like Figure 5 As shown, in the portion corresponding to fulcrum F, the rotating shaft 4d, which is integral with the arm member 4, protrudes on both sides in the Y-axis direction. The rotating shaft 4d consists of a thick shaft portion on the base end side and a thin shaft portion on the front end side. The thin shaft portion is supported by a support hole provided in the shaft support member 25 of the top plate 22. A ball bearing is provided in the support hole.

[0083] For example, a rotation angle sensor (not shown) is installed on the arm component 4 to detect the rotation direction, rotation speed, and rotation position and send them to the control device.

[0084] (Connecting rod component) The connecting rod 5 connects the point of action PA of the arm 4 to the upper part of the lifting frame 6, and transmits force by making the swinging motion of the arm 4 the downward motion of the lifting frame 6.

[0085] like Figure 2 As shown, the connecting rod member 5 consists of two slender rectangular plates 5a facing each other, connected by short cylindrical connecting members 5b located at three positions with gaps, making the two plates 5a a single connecting rod member 5.

[0086] At the upper end of the connecting rod member 5, an upper through hole 5c is provided through each of the two plate-shaped bodies 5a, and a shaft pin member SPM passes through the upper through hole 5c. At the upper end of the connecting rod member 5, the end of the arm member 4 on the action point PA side is connected in a manner that clamps between the two plate-shaped bodies 5a.

[0087] At the lower end of the connecting rod member 5, a lower through hole 5d is provided through each of the two plate-shaped bodies 5a, and a shaft pin member SPM passes through the lower through hole 5d. At the lower end of the connecting rod member 5, the connecting part 63 of the lifting frame 6 (described later) is connected in a manner that clamps between the two plate-shaped bodies 5a.

[0088] (Lifting frame) After casting is completed, the lifting frame 6 presses down on the sand mold part SM set in the sand box CF in the mold PM and pulls it out from the sand mold part SM and the sand box CF.

[0089] The lifting frame 6 includes a lifting part 61, a pressing plate 62, a connecting part 63, and a guide part 64 (see reference). Figure 2 as well as Figure 6 ).

[0090] (Lifting / Elevating Unit) The lifting part 61 is formed into a square cylindrical shape with a top, and a partition plate 61a is provided on the inner side from parallel walls arranged opposite each other along the X-axis and Y-axis directions. The two partition plates 61a intersect in a cross shape. The lower end of the partition plate 61a is formed so that the lower end of the square cylindrical wall is consistent with the end face.

[0091] The partition plate 61a is a component that reinforces the pressing plate 62 (described later) and suppresses the deformation of the pressing plate 62 due to the pressure during pull-out.

[0092] The pressing plate 62 is made of iron, for example, and is formed from a square or rectangular sheet of paper. The pressing plate 62 is formed to correspond to the size and shape of the lower surface of the sand mold part SM.

[0093] like Figure 2 As shown, a pair of guide rod connecting parts 61b protruding outward along the Y-axis direction are provided on the upper part of the lifting part 61, and the lower end of the guide rod 64b of the guide part 64 (described later) is connected to the guide rod connecting part 61b.

[0094] (Guidance Department) The guide section 64 guides the lifting section 61 to move in the vertical direction.

[0095] like Figure 2 As shown, the guide portion 64 includes a cylindrical portion 64a and a guide rod 64b.

[0096] The cylindrical portion 64a is made of iron, for example, and is formed into a cylindrical shape. As previously described, it is arranged along the Y-axis direction on both sides of the through hole 22a formed in the top plate 22.

[0097] In each cylindrical part 64a, the lower part passes through the top plate 22 and is fixed, and a flange part 64a1 is provided on the outer periphery of the upper part exposed from the top plate 22.

[0098] A guide rod 64b is slidably inserted into the cylindrical portion 64a. The guide rod 64b is, for example, formed as a rod made of iron with a circular cross-section, and its lower end is connected to the guide rod connecting portion 61b. The guide rod connecting portion 61b is configured to protrude outward in the Y-axis direction from the upper part of the lifting portion 61.

[0099] (Upward force generating device) The upward force generating device 8 further offsets the downward force generated by the weight of the lifting frame 6, the connecting rod 5, and the guide rod 53 that moves in the up and down direction in conjunction with them to the driving force transmission mechanism 3.

[0100] like Figure 2 As shown, the upward force generating device 8 includes a pulley 81, a hammer 82, a rope 83, and a guide rod 84. The upward force generating device 8 generates an upward force by means of the gravity of the hammer 82 passing through the pulley 81.

[0101] like Figure 3 As shown, pulleys 81 are arranged on both sides of the first opening 2c in the Y-axis direction of the top plate 22, separated by the first opening 2c. The pulleys 81 are fixed pulleys supported by a pulley platform 811 on the upper surface of the top plate 22, with a pulley shaft 812 extending in the Y-axis direction protruding from it.

[0102] like Figure 3 As shown, a rope 83 is attached to the outer circumference of the circular pulley 81. Figure 2 As shown, the inner end of the rope 83 is connected to the pulley rope connection part 65 of the guide rod connection part 61b provided in the lifting frame 6, and the outer end of the rope 83 is connected to the hammer 82 via the bracket.

[0103] The cord 83 is inserted through the hole in the second opening 2d of the aforementioned top plate 22 and hangs down.

[0104] Hammer 82, for example, is formed into a cuboid shape, such as... Figure 5 As shown, on the side surface arranged along the X-axis, each guide groove 82a is recessed in such a way that it extends in the vertical direction. The guide groove 82a is located on the side of the bracket of the hammer 82 near the lifting frame 6, and a protrusion 84a of the guide rod 84 is slidably inserted into the guide groove 82a.

[0105] The guide rods 84 are rectangular strips arranged on both sides of the hammer 82 along the X-axis, with protruding ribs 84a on the sides of the hammer 82. The guide rods 84 extend vertically, and their lower ends are fixed through the top plate 22. The guide rods 84 suppress the swaying of the hammer 82 during its up-and-down movement, guiding the hammer 82 to move up and down quickly and smoothly.

[0106] (Pulley rope connection) The lifting frame 6 has a pulley rope connection part 65.

[0107] like Figure 2 As shown, the pulley rope connection 65 is formed of a rectangular plate with a longitudinally elongated cross-section and is assembled to the front end of the two guide rod connection parts 61b. The pulley rope connection 65 extends along the Y-axis direction and protrudes beyond the lifting part 61 at both ends. Connection holes are provided at both ends, and the inner end of the rope 83 is connected to the connection holes as described above.

[0108] (Descent limiting device) Since the sand box CF is supported from below during the mold removal process, the descent limiting device 7 is used to allow the sand mold section SM to be pulled downward from the sand box CF via the lifting frame 6.

[0109] like Figure 1 As shown, in the first embodiment of the descent limiting device 7, the roller conveyor RC of the loading and unloading device IOC serves two functions: transporting the sand box CF and limiting the downward movement of the sand box CF.

[0110] The roller conveyor RC has a pair of roller support members RCa extending along the Y-axis direction, and multiple rollers RCb arranged along the Y-axis direction inside the roller support members RCa.

[0111] The roller conveyor RC moves the completed casting mold PM (with sand box) into the extraction position, and removes the sand box CF after the casting mold (sand mold part SM) has been extracted for reuse.

[0112] Each roller RCb is formed in the shape of a disc, and has a short cylindrical mounting part and a flange part. Each roller RCb is rotatably supported by a rotating shaft extending along the X-axis of the roller support member RCA.

[0113] At the point of ejection, a vibrating conveyor VC is installed below the roller conveyor RC.

[0114] (Vibrating conveyor) The vibratory conveyor VC extends along the X-axis, applying vibration while transporting the casting to separate the casting CT contained in the pulled-out sand mold section SM from the casting sand. Since the vibratory conveyor VC is known technology, its description is omitted.

[0115] (Work) The following is based on Figure 1 , Figure 6 as well as Figure 7 The operation of the mold removal device 1, which is constructed as described above, after casting is completed will be explained.

[0116] First, as the initial position, such as Figure 1As shown, the first connecting portion FCP of the rotating arm 30 is located directly above the drive rotating shaft EMb. Therefore, the first link member 31 and the second link member 32 extend in a straight line above.

[0117] Arm component 4 is Figure 1 The counterclockwise rotating end in the middle holds the lifting frame 6 at the rising end through the connecting rod component 5.

[0118] The pressing plate 62 of the lifting frame 6 is positioned opposite the upper surface of the sand mold part SM of the cast mold PM after casting is completed and moved to the position for the pull-out operation.

[0119] Next, as Figure 6 As shown, the control device drives the electric motor EM, causing the rotating arm 30 to rotate 180 degrees clockwise, moving the first connecting part FCP directly below the driving rotating shaft EMb (offset process). From the initial position to 180 degrees, the first connecting part FCP moves with a rotation radius L1 equal to the distance L1 between the driving rotating shaft EMb of the rotating arm 30 and the first connecting part FCP. At this time, the force point PF drops by almost twice the distance L1.

[0120] During this descent, the upward force generating device 8 prevents the descent speed of the lifting frame 6 from becoming faster than the rotation speed of the driving rotating shaft EMb.

[0121] After casting is completed, the sand mold part SM of the mold PM is peeled off from the sand box CF, shifted, and the initial process ends.

[0122] Next, as Figure 7 As shown, the control device causes the rotating arm 30 to rotate further, clockwise from the initial value to a position of 360 degrees. From 180 degrees to 360 degrees, accompanied by a rotation with a radius of L3 of the second connecting part SFC, the force point PF descends (movement process). L3 is the distance obtained by subtracting L1 from L2, the distance between the second connecting part SFC and the first connecting part FFC.

[0123] Furthermore, since L3 is a longer distance than L1, the force point PF moves and descends at a faster speed over the longer distance. Because the torque of the electric motor EM is constant, the load applied to the force point PF is smaller compared to the case of rotating 180 degrees from the initial position.

[0124] As the sand mold section SM is pulled out from the sand box CF, the casting CT contained in the sand mold section SM falls onto the vibrating conveyor VC, where vibration is applied to separate the casting CT from the sand and transport it to the demolding process.

[0125] In this way, during the pull-out operation, the actions corresponding to the initial process (offset process) which requires large force and the final pull-out process (movement process) which requires fast speed can be achieved without special control of the electric motor EM.

[0126] As can be clearly seen from the above description, the mold removal device 1 after casting includes: an electric motor EM; a lifting frame 6, which is configured to press the upper surface of the sand mold portion SM, which is the inner side of the sand box CF of the cast mold PM, so that the sand mold portion SM can be raised and lowered; and an arm member 4, which extends laterally and is provided with a fulcrum F, which is the center of rotation, a force point PF, which is added by the driving force of the electric motor EM, and an action point PA that rotates based on the driving force added to the force point PF. The action point PA is disposed above the lifting frame 6, and at least the force point PF is disposed at a position offset from above the lifting frame 6. The arm member 4 swings in a virtual vertical plane.

[0127] Furthermore, the mold removal device 1 after casting includes: a driving force transmission mechanism 3, which is disposed between the electric motor EM and the force point PF of the arm member 4; a connecting rod member 5, which extends in the vertical direction above the lifting frame 6 and connects the action point PA of the arm member 4 to the lifting frame 6; and a descent limiting device 7, which abuts against the outer periphery of the sand box CF when the lifting frame 6 descends to limit the descent of the sand box CF.

[0128] Accordingly, the force point PF, which contains the main mechanism, can be positioned offset from directly above the position where the mold (sand mold part SM) is ejected, thus eliminating the problem of space constraints. Furthermore, since the arm member 4 operates on a lever principle, a low-torque electric motor EM can be used at the force point PF, allowing for the selection of a low-cost electric motor EM, thereby reducing equipment costs and operating costs during use.

[0129] Furthermore, in the casting mold removal device 1 of the first embodiment, the driving force transmission mechanism 3 includes: a first mechanism (rotating arm 30) that generates the force required to offset the sand mold portion SM formed in the sand box CF downward from the sand box CF; and a second mechanism (first connecting rod member 31) that moves the sand mold portion SM further downward after being offset by the first mechanism (rotating arm 30).

[0130] Furthermore, the force generated by the first mechanism (rotating arm 30) for offset is greater than the force generated for downward movement via the second mechanism (first link member 31). Therefore, the speed at which the sand mold part SM moves downward via the second mechanism (first link member 31) is faster than the speed at which it is offset via the first mechanism (rotating arm 30).

[0131] Accordingly, during the extraction operation, when a large force is required, the first mechanism (rotating arm 30) moves; when a high speed is desired, the second mechanism (first connecting rod member 31) moves. In this way, the actions corresponding to the extraction operation of the cast mold after casting can be achieved without special control of the electric motor EM.

[0132] In this way, without changing the output of the electric motor EM itself, which is the drive source, the high-load area of ​​low-speed descent and the low-load area of ​​high-speed descent can correspond to the load required for the extraction of the mold (sand mold part SM) and thus perform its function efficiently.

[0133] In addition, the first mechanism has a rotating arm 30 whose front end rotates at a predetermined radius by being driven by an electric motor EM, and the second mechanism has a first link member 31 whose base end is connected to the front end of the rotating arm 30. The first link member 31 is wound around the rotating arm 30 so that the front end of the first link member 31 rotates at a radius larger than the radius of rotation of the rotating arm 30.

[0134] Accordingly, the high-load region of low-speed ascent is achieved by rotating the rotating arm 30 to wrap around the first link member 31. Moreover, the low-load region of high-speed ascent can be achieved by wrapping the first link member 31, which is larger than the rotation radius of the rotating arm 30, around the force point PF of the arm member 4.

[0135] In addition, the casting mold removal device 1 of the first embodiment is equipped with an upward force generating device 8, which generates an upward force to reduce the weight of the lifting frame 6 and the connecting rod member 5 at the point of action PA of the arm member 4, which generates a downward force.

[0136] If the downward force generated by the component assembly including the lifting frame 6 and the connecting rod member 5 due to their respective weights is large, there is a risk that the descent speed of the lifting frame 6 may become faster than the rotation speed of the drive shaft EMB during the process of lowering the cast mold PM. In this case, it may hinder the operation of the drive mechanism.

[0137] Specifically, the rotating arm 30, the first connecting rod member 31, and the second connecting rod member 32 are smoothly wound in a state where they are stretched in a straight line by the rotation of the rotating arm 30.

[0138] However, if the descent speed of the lifting frame 6 is faster than the rotation speed of the rotating arm 30, it cannot maintain a straight extension state. Due to loosening, bending occurs between the rotating arm 30 and the first connecting rod member 31, and between the first connecting rod member 31 and the second connecting rod member 32, which hinders the smooth winding action.

[0139] The upward force generating device 8 prevents the descent speed of the lifting frame 6 from becoming faster than the rotation speed of the rotating arm 30, thus enabling a smooth winding action.

[0140] In addition, the upward force generating device 8 generates an upward force by means of the gravity of the hammer 82 via the pulley 81.

[0141] Accordingly, without the need for a dedicated driving force generating device, the downward force affecting the operation of the driving force transmission mechanism 3 can be reduced by using a simple mechanism based on the gravity of the hammer 82.

[0142] In addition, after casting, the mold removal device is set to allow the rotating arm 30, the arm member 4, and the connecting rod member 5 to move in a rotating or swinging manner on the same virtual plane (the vertical plane in this embodiment).

[0143] Accordingly, the rotating arm, the arm component, and the connecting rod component can be configured in a compact manner, thereby achieving space saving.

[0144] (Second Implementation) Next, the following is based on Figure 8 as well as Figure 9 The second embodiment of the mold removal device after casting is described in this article.

[0145] In the second embodiment, the mold removal device 201 after casting is completed has a receiving part RP provided on the support frame 202, and the structure of the driving force transmission mechanism 203 is different. In the arm member 204, the member that can serve as the fulcrum F is located in two positions, resulting in a different structure. The lifting frame 206 has a different structure. In the above points, it differs from the first embodiment, but other components are the same, so the description is omitted.

[0146] The support frame 202 supports the electric motor EM, the receiving part RP, and the infeed / outfeed device IOC (roller conveyor RC), etc.

[0147] The support frame 202 is formed by assembling six lower support columns 2021, upper support columns 2022 that are continuous with the lower support columns 2021, and multiple horizontal and vertical crossbars when viewed from above, into a long cuboid shape along the X-axis.

[0148] exist Figure 8 The middle section on the right side of the device is provided with a bracket 202a, in which two electric motors EM are arranged so that their output shafts are opposite each other.

[0149] exist Figure 8 The middle section on the left side of the device is equipped with a roller support member RCa of the loading and unloading device IOC that extends along the Y-axis direction.

[0150] At the upper end of the support frame 202, a rectangular top plate 202b extending along the Y-axis is supported by a top support column (not shown in the figure). Figure 8 As shown, on the top plate 202b, the first receiving part RP1 and the second receiving part RP2, which are respectively received by the first roller RL1 and the second roller RL2 (described later), are provided in a downward protruding manner.

[0151] (Acceptance Department) The receiving part RP has a first receiving part RP1 and a second receiving part RP2. The first receiving part RP1 and the second receiving part RP2 are formed from a pair of rectangular plates. For example... Figure 8 As shown, the first receiving part RP1 and the second receiving part RP2 are arranged in a state where the plate protrudes downward from the top plate 202b, and each has a crescent-shaped recess RPa formed by a semi-circular cut in its lower part.

[0152] In these crescent-shaped recesses RPa, the first roller RL1 and the second roller RL2, described later, are supported in a detachable manner.

[0153] (Drive force transmission mechanism) The driving force transmission mechanism 203 includes a rotating arm 2030 and a connecting rod member 2031.

[0154] The rotating arm 2030 is connected to the drive rotating shaft EMb, which is connected to the output shaft of the two electric motors EM, in a non-rotatable manner.

[0155] (Rotating arm) In the second embodiment, the rotating arm 2030 is made of iron, for example, and is formed of two long, plate-shaped components that taper towards the front end. A connecting hole (not shown) is formed at the front end, which forms part of the first connecting portion TFCP, and is connected to the connecting rod component 2031 through the first connecting portion TFCP.

[0156] (Connecting rod components) The connecting rod component 2031 is, for example, made of iron and formed from a single boomerang-shaped sheet of metal bent in the middle. Figure 8 As shown, a lower connecting hole is formed at the end of the connecting rod member 2031 on the side of the rotating arm 2030. Together with the connecting hole of the rotating arm 2030 (not shown), it is connected by a shaft pin AP to form the first connecting part TFCP.

[0157] The middle part of the connecting rod member 2031 is bent so that when the rotating arm 2030 is positioned in the vertical direction at the upper end, the middle part of the connecting rod member 2031 does not contact the drive rotating shaft EMb.

[0158] The rotating arm 2030 and the connecting rod component 2031 are rotatably connected in the virtual vertical plane in which the rotating arm 2030 rotates.

[0159] An upper connection hole (not shown) is provided at the end of the connecting rod member 2031 on the arm member 204 side, forming part of the second connection part TSCP.

[0160] (Arm component) In the second embodiment, the arm member 204 is made of iron, for example, and the main body of the connecting rod member 5 is formed from a long plate. At the end of the force point PF side, which will be described later, two short plates are joined together, for example, by means of a base end being clamped by the main body through welding or the like.

[0161] A connecting hole (not shown) is provided at the front end of the connecting rod member 2031 on the arm member 204. A pin AP, which communicates with the upper connecting hole of the connecting rod member 2031 (which is a single sheet material), is inserted for connection. The upper connecting hole, the connecting hole, and the pin AP constitute the second connecting part TSCP. Furthermore, the pin AP inserted at the center of the second connecting part TSCP is set as the force point PF. In addition, the pin AP of the connecting part where the arm member 204 connects to the connecting rod member 5 is set as the action point PA.

[0162] The arm member 204 is provided with a first roller RL1 (equivalent to the first fulcrum FF) located on the side near the point of action PA, and a second roller RL2 (equivalent to the second fulcrum SF) located on the side near the point of force PF.

[0163] (roller) The rollers, as described above, have a first roller RL1 and a second roller RL2.

[0164] like Figure 8 As shown, the first roller RL1 and the second roller RL2 are respectively provided with rotating support shafts RLs (equivalent to rotating shafts) that are fixed in a way that allow the arm member 204 to pass through at right angles and extend in the horizontal direction. The rotating support shafts RLs are configured to be orthogonal to the vertical plane in which the arm member 204 swings.

[0165] The first roller RL1 and the second roller RL2 each have a roller body and a ball bearing section.

[0166] The roller bodies are formed as a pair of components, for example, in the shape of discs, and are configured to clamp the arm members 204 from both sides. A flange is provided on the inner side of the outer periphery of each disc (on the side of the arm member 204). The inner side of the abutting position of the receiving part RP abuts against the flange, and the flange restricts the lateral movement of the roller RL.

[0167] An embedding hole is provided at the center of the disc-shaped roller body for the rotating support shaft RLs to be embedded, and a ball bearing is installed in the embedding hole.

[0168] Furthermore, the first fulcrum FF and the second fulcrum SF can be considered as the rotary support shaft RLs of the first roller RL1 and the second roller RL2. However, as a structure that supports by generating force through the principle of "lever", in this specification, it is considered that the support is provided by the roller body including the first roller RL1 and the second roller RL2 and the rotary support shaft RLs as a whole, with the first roller RL1 as the first fulcrum FF and the second roller RL2 as the second fulcrum SF.

[0169] (Roller guide) like Figure 8 as well as Figure 9 As shown, the roller guide RG is made of iron and is formed from two rectangular plates. Each plate has an opening OH that is inserted into the outer periphery of the first roller RL1 and moves along an arc-shaped track. The second roller RL2 is supported by the receiving part RP and is guided by the first roller RL1 moving downward along the track when the effective fulcrum F switches from the first roller RL1 to the second roller RL2.

[0170] (Upward force generating device) Upward force generating device 8, for example, can use Figure 2 The components shown. The upward force generating device 8 counteracts the downward force generated by the weight of the lifting frame 206, the connecting rod component 5, and the guide rod (not shown) that moves upward and downward in conjunction with them.

[0171] Furthermore, when the first roller RL1 or the second roller RL2 functions as an effective fulcrum F, the weight of the hammer 82 is set in such a way as to generate an upward pressing force so as not to cause the first roller RL1 to deviate from the first receiving part RP1 and the second roller RL2 to deviate from the second receiving part RP2 respectively.

[0172] (Lifting frame) like Figure 8 As shown, the lifting frame 206 in the second embodiment includes a pull-out plate 2062 and a support plate 2063.

[0173] The pull-out plate 2062 is formed, for example, from a rectangular sheet of iron and abuts against the upper surface of the sand mold portion SM formed inside the sand box CF.

[0174] The upper surface of the pull-out plate 2062 is supported by the support plate 2063. The support plate 2063 is made of iron and is formed into a rectangular thick plate. When the mold (sand mold part SM) is offset from the sand box CF and pulled downward, the support plate 2063 prevents the pull-out plate 2062 from deforming due to the force loaded on the pull-out plate 2062, making smooth offset and downward pull-out operations possible.

[0175] (Work) The following is based onFigure 8 as well as Figure 9 The operation of the mold removal device 201, which is configured as described above, after casting is completed will be explained.

[0176] In its initial position, the rotating arm 2030 is positioned vertically below the drive rotating shaft EMB. The connecting rod member 2031 extends upward from the front end of the rotating arm 2030, pulling down the force point PF of the arm member 204.

[0177] This position becomes the rotating end of the arm member 204 in counterclockwise rotation. The first fulcrum FF of the arm member 204 is supported by the receiving part RP, becoming the effective fulcrum F. The point of action PA and the lifting frame 206 become the rising end position.

[0178] After casting, the mold PM (SM, CF) is moved into the position for the pull-out operation by the roller conveyor RC. The pull-out plate 2062 of the lifting frame 6 is positioned opposite the upper surface of the sand mold part SM through the gap.

[0179] Next, as Figure 9 As shown, the control device rotates the rotating arm 2030 180 degrees clockwise and positions it above the vertical direction of the drive rotating shaft EMb.

[0180] As the force point PF rises, the arm component 204, midway through rotation, switches the effective fulcrum F from the first fulcrum FF to the second fulcrum SF, causing the point of application PA to rotate counterclockwise. Compared to the case where the first fulcrum FF is the effective fulcrum F, the case where the second fulcrum SF is the effective fulcrum F results in a larger rotation radius, thus the point of application PA and the lifting frame 6 move significantly and rapidly.

[0181] Thus, in the initial stage of the pull-out operation (offset process), the effective fulcrum F is used as the first fulcrum FF, resulting in a short movement distance but strong force. Moreover, in the latter half of the pull-out operation (movement process), the effective fulcrum F is used as the second fulcrum SF, resulting in a smaller force but a longer movement distance, enabling a faster operation.

[0182] As can be clearly seen from the above description, in the casting mold removal device 201 of the second embodiment, in the arm member 204, the fulcrum F is set between the force point PF and the action point PA. The fulcrum F has two fulcrums F: a first fulcrum FF and a second fulcrum SF arranged at a position closer to the force point PF than the first fulcrum FF. The first fulcrum FF is used when the sand mold part SM formed in the sand box CF is offset downward from the sand box CF. The second fulcrum SF is used in combination with the first fulcrum FF when the offset sand mold part SM is moved further downward.

[0183] Therefore, in the arm component 204, when the first fulcrum FF is used, since the point of action PA is closer and the point of force PF is farther than the second fulcrum SF, according to the lever principle, the movement distance at the point of action PA is short, but a large force is easily generated.

[0184] When using the second fulcrum SF, it is difficult to generate a large force at the point of application PA, but it can greatly ensure the movement distance and increase the downward movement speed.

[0185] Furthermore, according to the casting mold removal device 201 after casting is completed, the first fulcrum FF and the second fulcrum SF are equipped with: a roller RL, which has a rotation axis (rotation support axis RLs) extending in a direction orthogonal to the vertical plane in which the arm member 204 swings; and a receiving part RP, which is provided with a crescent-shaped recess RPa corresponding to the outer periphery of the roller RL, and the outer periphery of the roller RL is supported by the crescent-shaped recess RPa so that it can be disassembled in the vertical direction.

[0186] Accordingly, with the freely rotating roller RL and the receiving part RP corresponding to the shape of the roller RL, and with the first fulcrum FF and the second fulcrum SF each becoming an effective fulcrum F, the rotation center of the arm member 204 will not become eccentric. The first fulcrum FF and the second fulcrum SF, which do not produce the aforementioned eccentricity, can be easily and smoothly switched.

[0187] Additionally, a roller guide RG is provided at the first fulcrum FF to guide the movement of the roller RL, which deviates from the receiving part RP.

[0188] Accordingly, when the effective fulcrum F is switched to the second fulcrum SF, the first roller RL1, which is the first fulcrum FF, moves away from the receiving part RP, but the track for movement is restricted by the roller guide RG, so stable and safe movement can be performed.

[0189] Furthermore, the upward force generating device 8 can be based on a structure of hammer 82 via pulley 81, but is not limited to this. For example, a balance valve could also be used. In the balance valve, a hydraulic cylinder can be used to withstand the back pressure generated by the weight of the component assembly including the lifting frame and prevent descent.

[0190] This invention is not limited to the embodiments shown above and in the accompanying drawings, and can be implemented with appropriate modifications without departing from the spirit of the invention.

[0191] Explanation of reference numerals in the attached figures 1: Mold removal device after casting; 3: Drive force transmission mechanism; 31: First connecting rod component (drive force transmission mechanism); 32: Second connecting rod component (drive force transmission mechanism); 4: Arm component; 5: Connecting rod component; 6: Lifting frame; 62: Pressing plate; 7: Lowering limiting device; 8: Upward force generating device; 81: Pulley; 82: Hammer; 83: Rope; 201: Mold removal device after casting; 203: Drive force transmission mechanism; 2030: Rotating arm (drive force transmission mechanism); 2031: Connecting rod component (drive force transmission mechanism) ; 204: Arm component; 206: Lifting frame; 2062: Pull-out plate; CF: Sand box; EM: Electric motor; EMa: Output shaft; EMb: Drive rotation shaft; F: Fulcrum; FF: First fulcrum; SF: Second fulcrum; PA: Point of application; PF: Force point; PM: Casting mold after casting; RC: Roller conveyor (lowering limit device); RP: Receiving part; RP1: First receiving part; RP2: Second receiving part; RL: Roller; RL1: First roller; RL2: Second roller; RLs: Rotary support shaft (rotation shaft); SM: Sand mold part.

Claims

1. A mold removal device after casting, wherein, The mold removal device after casting includes: Electric motor; The lifting frame presses down on the upper surface of the sand mold part inside the sand box after the casting is completed, so that the sand mold part can be lowered. An arm member extends laterally and is provided with a fulcrum that serves as a center of rotation, a force point for which the driving force of the electric motor is applied, and an action point that rotates based on the driving force applied to the force point. The action point is disposed above the lifting frame, and at least the force point is disposed at a position offset from above the lifting frame. The arm member swings in a virtual vertical plane. A driving force transmission mechanism is disposed between the electric motor and the force point of the arm member; A linkage member extending vertically above the lifting frame connects the point of action of the arm member to the lifting frame. as well as A descent limiting device that abuts against the sand box and restricts the descent of the sand box as the lifting frame descends.

2. The apparatus according to claim 1, wherein, The driving force transmission mechanism includes: The first mechanism generates the force required to offset the sand mold portion formed within the sand box downwards from the sand box; as well as The second mechanism further moves the sand mold portion, which has been offset by the first mechanism, downwards. The force generated by the first mechanism for offset is greater than the force generated by the second mechanism for downward movement. The second mechanism causes the sand mold portion to move downwards at a faster speed than the first mechanism causes it to deflect.

3. The apparatus according to claim 2, wherein, The first mechanism includes a rotating arm, the front end of which rotates by a predetermined radius driven by the electric motor. The second mechanism includes a first link member whose base end is connected to the front end of the rotating arm, and the first link member is wound around the rotating arm so that the front end of the first link member rotates with a radius larger than the radius of rotation of the rotating arm.

4. The apparatus according to claim 1, wherein, In the arm component, the fulcrum is located between the force point and the point of application. The fulcrum has two points: a first fulcrum and a second fulcrum located closer to the point of force than the first fulcrum. The first fulcrum is used when offsetting the sand mold portion formed within the sand box downwards from the sand box. The second fulcrum is used interchangeably with the first fulcrum when the offset sand mold portion is moved further downward.

5. The apparatus according to claim 4, wherein, At the first fulcrum and the second fulcrum, there are: A roller having a rotation axis extending along a direction orthogonal to the vertical plane in which the arm member swings; and The receiving part has a crescent-shaped recess corresponding to the outer periphery of the roller, and the outer periphery of the roller is supported by the crescent-shaped recess so that it can be disassembled in the vertical direction.

6. The apparatus according to claim 5, wherein, A roller guide is provided at the first fulcrum to guide the movement of the roller that deviates from the receiving part.

7. The apparatus according to claim 1, wherein, The casting mold removal device after casting is completed includes an upward force generating device, which generates an upward force that reduces the downward force generated by the weight of the lifting frame and the connecting rod member at the point of action of the arm member.

8. The apparatus according to claim 7, wherein, The upward force generating device generates an upward force through the gravity of a hammer passing through a pulley.

9. The apparatus according to claim 3, wherein, The rotating arm, the arm component, and the connecting rod component move on the same plane.

10. A method for removing a casting mold after casting is completed, comprising a method for removing a casting mold after casting using the casting mold removal device as described in claim 1, wherein, The method for removing the mold after casting includes: In the offset process, the driving force of the electric motor is transmitted to the lifting frame via the driving force transmission mechanism and the arm member, thereby offsetting the sand mold part in the vertical direction in order to pull the sand mold part out of the sand box. as well as In the downward moving process, the sand mold portion, after being offset by the offset process, is moved downward with a force smaller than that used in the offset process and at a speed faster than that used in the offset process.

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