Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
  • B22D29/04—Handling or stripping castings or ingots

Definitions

• the present invention relates to a mold extraction device for extracting a poured mold from a flask, and a mold extraction method using the device.
• a method for removing a poured mold from a flask there is a method in which the mold is pulled out directly below the flask using a cylinder device.
• the poured mold is dropped onto a recovery device, such as a shakeout machine or a vibrating conveyor, and is transported to the next step for deburring and inspection.
• the hydraulic cylinder requires a hydraulic unit to operate and control the cylinder, and there is a problem in that the amount of electric power increases in many cases where the hydraulic pump motor is constantly operated during production. Therefore, in recent years, with the aim of saving energy by reducing power consumption, non-hydraulic cylinders are being considered, and actuators are being electrified.
• Patent Document 1 discloses a mold ejection process in which the sand mold is dropped downward by a punch head that is stopped on the upper surface of the sand mold (sand mold part) and a flask lifting means that raises the poured sand mold with a frame. The equipment is described.
• Patent Document 1 does not take this point into consideration at all. Therefore, when an electric motor is used in the device disclosed in Patent Document 1, there is a problem that the drive system becomes larger in order to cope with the large torque generated in the rotational drive shaft when the mold is removed from the inner wall of the flask at the initial stage of extraction. was there. In addition, in order to generate a large torque, the rotational speed of the rotary arm portion becomes slow, and there is a problem in that it takes a long time to extract the rotary arm portion downward.
• the present invention has been made in view of the conventional problems, and its purpose is to use an electric motor to generate a large torque in the initial stage in a mold extraction device, and to generate a large torque during the subsequent downward extraction operation. It is an object of the present invention to provide a pouring mold extraction device and a pouring mold extraction method capable of performing the extraction at a high speed.
• the drive mechanism includes an electric motor, a rotational drive shaft driven by the electric motor, and a drive mechanism that extends in the vertical direction and is connected to the drive mechanism.
• a link member whose lower part is connected; a vertical guide member which is connected to the upper part of the link member and guides the movement of the link member in the vertical direction; and a vertical guide member which is connected to the vertical guide member and extracts the sand mold part from the flask.
• an elevating frame that comes into contact with the upper surface of the sand mold part that is inside the flask of the poured mold and moves up and down based on the vertical movement of the vertical guide member;
• a flask lowering regulating device is provided that supports the flask of the completed mold and restricts the flask from moving downward.
• the drive mechanism includes a shifting section that works with the flask lowering regulating device to shift the lifting frame downward by a predetermined length in order to detach the sand mold part from the bonded flask at the extraction position. and a pull-out part that pulls out the shifted sand mold part downward with a force smaller than the shifting force by the shifting part and at a speed faster than the shifting speed by the shifting part.
• the device can be made more compact. It is possible to improve work efficiency.
• the shifting portion is an axis parallel to the rotation center of the rotary drive shaft.
• the rotating part includes a cylindrical rotating part having the axis eccentric from the rotation center of the rotary drive shaft by a predetermined dimension.
• the pulling out part is a rotating arm part having a predetermined rotation radius extending in the radial direction of the rotating part, and the proximal end part is capable of relatively rotating around the outer periphery of the rotating part.
• the rotary arm portion has an opening holding portion for holding the opening, and the rotary arm portion has the first link portion on the distal end side.
• the link member includes a second link portion rotatably connected to the first link portion of the rotary arm portion at one end, a third link portion at the other end, and the vertical guide member , a fourth link portion rotatably linked to the third link portion.
• the rotary arm section and the rotary arm section are provided with a rotation angle regulating section that rotates integrally with the rotary arm section.
• the eccentric shaft center moves from above the rotation center to below the rotation center due to the rotation of the rotating part, thereby lowering the link member by the distance necessary for shifting.
• the rotating part and the opening holding part of the rotating arm part rotate (idle) relative to each other, and the rotating arm part does not rotate, so the link member descends by the distance necessary for the shift by the rotating part. .
• the rotation angle regulating device releases the rotation (idling) state of the rotating arm part relative to the rotating part, and the rotating arm part rotates.
• the first link part of the rotating arm part moves from above the rotation center to below the rotation center, thereby further lowering the link member. This allows the shifted sand mold portion to be pulled out completely downward from the flask.
• the eccentric predetermined dimension of the shifted portion is to generate the first stroke in the vertical direction necessary to displace the sand mold part from the inner wall of the flask, and at the same time, the force necessary for displacing the sand mold part is applied to the rotating part by the rotational torque of the electric motor.
• the predetermined radius of rotation of the rotary arm is a dimension for producing a second stroke in the vertical direction necessary for downward extraction of the sand mold part detached from the flask. be. Note that the "dimension for producing" does not refer to the first stroke itself, but to a dimension that is directly or indirectly related, such as 1/2 of the first stroke, for example. The same applies to the second stroke.
• the dimension of the eccentric position of the rotating part that is deviated by a predetermined distance from the rotation center of the rotary drive shaft is determined by the force and first stroke required to separate the poured mold in the flask from the inner wall of the flask. , and generates the force and second stroke required to pull out the casting flask downward after separation from the inner wall of the casting flask, with the rotation radius being a predetermined dimension from the center of rotation of the rotating arm part. shall be.
• the electric motor which is the only drive source, can efficiently set a high output range due to the low speed downward movement of the first stroke and a low output area due to the high speed downward movement of the second stroke, depending on the load.
• the rotating arm portion when the elevating frame is raised, the rotating arm portion is moved in a direction opposite to when it is lowered.
• a link biasing device is provided for biasing the link member to rotate.
• the poured mold extraction device of the second aspect of the present invention to the poured mold extraction device of the fourth aspect of the present invention can be used.
• the downward force generated on the rotating section and the rotating arm section by the weight of each component group including the lifting frame and the link member is offset by generating an upward force of at least the same value. Equipped with an upward force generator.
• the downward force generated by the weight of each component group including the lifting frame and the link member is large, the lowering speed of the lifting frame may become faster than the rotational speed of the rotary drive shaft during the lowering process to extract the mold. In such a case, there is a possibility that the operation of the drive mechanism will be impaired.
• the upward force generating device that offsets the downward force can suppress rotation of the rotary arm during the first stroke of the lowering process. Further, in the second stroke of the lowering step, separation of the locking member and the locked member can be prevented.
• the upward force generating device generates the upward force by the gravity of a weight via a pulley. generate force. According to this, the downward force that affects the operation of the drive mechanism can be offset by a simple mechanism using the gravity of the weight, without providing a device that generates a dedicated drive force.
• a drive mechanism including an electric motor and a rotational drive shaft driven by the electric motor; a link member whose lower part is connected; a vertical guide member which is connected to the upper part of the link member and guides the link member by converting the movement of the link member in the vertical direction; an elevating frame that comes into contact with the upper surface of the sand mold part that is inside the flask of the poured mold at the extraction position where the part is extracted, and moves up and down based on the movement of the vertical guide member in the vertical direction, and at the extraction position,
• a mold extraction method using a mold extraction device which includes a flask descent restriction device that supports the flask of the poured mold and restricts the flask from moving downward.
• the sand mold part is shifted downward by a predetermined length by the elevating frame in cooperation with the flask lowering regulating device. and a pulling-out step of pulling out the shifted sand mold portion downward from the flask with a force smaller than the force for shifting it at the shifting section and at a speed faster than the speed at which it is shifted at the shifting section.
• the device can be made more compact. It is possible to improve work efficiency.
• FIG. 1 is a schematic diagram of an embodiment of a pouring mold extraction device of the present invention as seen from the front side, partially in cross section.
• FIG. 2 is a schematic side view showing an embodiment of a poured mold extraction device, partially in cross section. 2 is a sectional view taken along III-III in FIG. 1.
• FIG. 2 is a sectional view taken along line IV-IV in FIG. 1.
• FIG. 2 is a sectional view taken along line V-V in FIG. 1.
• FIG. FIG. 3 is a diagram of the rotational drive shaft and the rotating section viewed from the Y-axis direction.
• FIG. 2 is an enlarged cross-sectional view showing a rotating part and a rotating arm part.
• FIG. 3 is a diagram showing a state in which the rotary drive shaft is rotated 270 degrees and the rotary arm portion is rotated 90 degrees.
• FIG. 3 is a diagram showing a state in which the rotary drive shaft is rotated 360 degrees and the rotary arm portion is rotated 180 degrees.
• FIG. 3 is a diagram showing a state in which extracted castings and foundry sand are conveyed by a vibrating conveyor.
• the horizontal direction extending left and right in FIG. 1 is referred to as the X-axis direction
• the horizontal direction perpendicular to the X-axis direction is referred to as the Y-axis direction.
• the side closer to the center line is called the inside, and the side farther from the center line is called the outside.
• the poured mold extraction device 1 in the embodiment includes an electric motor EM, a drive mechanism 3, a link member 4, a vertical guide member 5, an elevating frame 6, and a flask lowering regulating device. 7.
• the poured mold extraction device 1 is installed on a base 2 provided above the floor (not shown).
• the base 2 is made of iron, for example, and is formed in the shape of a rectangular thick plate, and is fixedly arranged above the floor surface by a structural frame (not shown).
• the base 2 has a first opening 21 through which a link member 4 and a rotating arm portion 33 (described later) pass, a second opening 22 through which a roller chain RC (described later) passes, and a third opening through which a wire rope 93 of a pulley 91 passes.
• a section 23 is provided.
• the first opening 21 is formed in a rectangular shape that extends long in the Y-axis direction at a position slightly shifted to the left from the center in the X-axis direction (see FIGS. 1 and 4).
• a link biasing device 8 which will be described later, is provided on the upper surface of the edge of the first opening 21 on the right side in the X-axis direction and on the front side in the Y-axis direction.
• Vertical guide members 5, which will be described later, are provided at four locations around the first opening 21 of the base 2.
• the second opening 22 is provided on the right side of the base 2 in a rectangular shape that extends in the Y-axis direction in FIG. 4 .
• An electric motor EM which will be described later, is fixed to the upper surface of the right end of the second opening 22.
• a small sprocket LS is provided around the rotating shaft that is continuous with the output shaft of the electric motor EM, and the small sprocket LS is arranged to face the second opening 22 .
• the third openings 23 are provided on both sides of the first opening 21 in the Y-axis direction.
• the third opening 23 is formed of two circular holes aligned in the Y-axis direction at respective positions.
• the center part of the opposing edge which is the long side extending in the Y-axis direction of the first opening 21, and the left side extending in the Y-axis direction of the second opening 22.
• a bearing JU is provided at the center of each side edge. These bearings JU rotatably support a rotary drive shaft 31, which will be described later.
• a rotary encoder RE is attached as a rotation angle sensor to the lower surface on the left side of the bearing JU.
• the electric motor EM drives a drive mechanism 3, which will be described later.
• an inverter-controlled motor or a servo-controlled motor is selected depending on the cycle time. In the case of an inverter-controlled motor, it requires a lot of time to switch between high and low speeds and to decelerate, so it is applied when the cycle time is long.
• the electric motor EM is attached to the upper surface of the right end of the base 2 in FIG. 1 via a pedestal.
• the small sprocket LS is attached to the outer periphery of the output shaft of the electric motor EM.
• a large sprocket BS having a larger diameter than the small sprocket LS is provided at one end of a rotational drive shaft 31 of the drive mechanism 3, which will be described later, so as to face the small sprocket LS.
• the rotation axis of the small sprocket LS and the rotation axis of the large sprocket BS are provided parallel to each other.
• An endless annular roller chain RC is hung between the large sprocket BS and the small sprocket LS, and transmits the rotational torque of the electric motor EM to the rotational drive shaft 31.
• the drive mechanism 3 is driven by an electric motor EM, and vertically moves a link member 4 that raises and lowers an elevating frame 6, which will be described later.
• the drive mechanism 3 includes a rotational drive shaft 31, a rotating section 32, and a rotating arm section 33.
• the rotational drive shaft 31 is made of iron and has a round bar shape, for example, and is arranged below the base 2 so as to extend in the X-axis direction. At the left position in FIG. 1, a thick shaft portion 31a having a slightly larger diameter is provided around the left end portion, and is shifted inward by a predetermined width in the X-axis direction.
• a large sprocket BS having a large outer diameter is attached to the right end of the rotary drive shaft 31 in FIG. 1 so as to be relatively non-rotatable.
• the rotation center of the large sprocket BS is configured to be coaxial with the rotation center 31c of the rotary drive shaft 31.
• the rotary encoder RE is arranged at the left end of the rotary drive shaft 31 in FIG. 1, and detects the rotation angle of the rotary drive shaft 31.
• a rotating portion 32 is integrally fixed to the center of the thick shaft portion 31a so as to protrude in the radial direction.
• the rotating portion 32 is formed in a short cylindrical shape and has a larger diameter than the thick shaft portion 31a of the rotational drive shaft 31.
• the rotating section 32 constitutes a part of the shifting section.
• the rotation center 31c of the rotation drive shaft 31 and the axial center 32c of the rotation part 32 are set to be parallel to each other, and the axial center 32c of the rotation part 32 is eccentric from the rotation center 31c of the rotation drive shaft 31 by a predetermined dimension. It is assembled in one piece.
• the rotation center 31c of the rotary drive shaft 31 and the axis 32c of the rotating portion 32 mainly constitute a shifted portion.
• This eccentric dimension is a dimension for producing a first stroke FS to be described later, and in this embodiment corresponds to 1/2 of the first stroke FS.
• the outer periphery of the rotating part 32 is relatively rotatably held within an opening holding part 33a of a rotating arm part 33, which will be described later (see FIG. 2).
• the rotating part 32 is provided with a locking part 321.
• locking part 321 comes into contact with a locked part 331 provided on a rotating arm part 33, which will be described later, when the rotating part 32 rotates 180 degrees relatively forward or backward.
• the relative rotation angle between the rotating section 32 and the rotating arm section 33 is regulated.
• the locking portion 321 is formed into a rectangular plate shape that extends in the radial direction from the rotation drive shaft 31 (integrated with the rotation portion 32). As shown in FIG. 7, the locking parts 321 are provided on both sides of the rotating part 32 so as to sandwich the rotating part 32 along the X-axis direction, and are integrally assembled to the rotation drive shaft 31.
• the rotating arm portion 33 has a substantially egg-shaped cross section when cut along an imaginary vertical plane including the Y-axis direction, and has an opening holding portion 33a that is open in the X-axis direction on the base side.
• Arc-shaped locked portions 331 having a predetermined length shorter than a semicircular arc are assembled to the edge portions on both sides of the opening of the opening holding portion 33a.
• the locked portion 331 is such that when the rotating arm portion 33 rotates around the rotating portion 32, one or the other side surface of the locking portion 321 is attached to the upper end or the lower end of the arc-shaped locked portion 331. (See Figure 6). This restricts the relative rotation between the rotating section 32 and the rotating arm section 33 after they come into contact. Furthermore, the locking portion 321 and the locked portion 331 allow the rotating arm portion 33 to rotate within a relatively rotatable range of 180 degrees with respect to the rotating portion 32 .
• the locking portion 321 and the locked portion 331 constitute a rotation angle regulating portion.
• a first link portion L1 is formed on the distal end side of the rotating arm portion 33. As shown in FIG. 7, the first link portion L1 includes a connecting hole LH, a bearing BR, and a shaft pin SP.
• the connecting hole LH is formed in a circular shape so that the shaft center extends in the X-axis direction, and pivotally supports the shaft pin SP via bearings BR provided at both end edges of the opening.
• Both ends of the shaft pin SP are formed to have a smaller diameter than the center, and two bearings BR are provided to sandwich two step portions that form the boundaries between the ends and the center.
• the second link portion L2 of the link member 4 is connected to the tip portions on both sides of the shaft pin SP.
• the second link portion L2 includes a communication hole CH formed in two long plate-shaped members 41 of the link member 4, which will be described later.
• a contact surface 33b is provided on the side surface of the rotary arm portion 33, which is the forward side of rotation when the rotary arm portion 33 rotates to lower the link member 4.
• the contact surface 33b is provided flat and parallel to a line connecting the rotation center 31c of the rotary drive shaft 31 and the axis of the connecting hole LH (see FIG. 7).
• This abutment surface 33b abuts against a rotary arm stopper AS provided to protrude from the lower surface of the base 2 when the rotary arm 33 rotates and the elevating frame 6 reaches the lower end (see FIG. reference).
• the rotating arm stopper AS includes a cylindrical female threaded tube fixed to a mounting member hanging from the lower surface of the base 2 so that its axis extends in the Y-axis direction, and a base end screwed into the female threaded tube. It includes a bolt and a nut screwed onto the bolt.
• the link member 4 transmits the driving force of the drive mechanism 3 to a vertical guide member 5, which will be described later.
• the link member 4 includes two long plate-shaped members 41 made of iron and extending in the vertical direction, for example.
• the two members 41 are overlapped with a gap and formed integrally.
• a curved portion 41a having a second link portion L2 at the lower end is formed in each lower portion.
• a straight part 41b continuous to the curved part 41a is formed in the upper part, and a third link part L3 is provided at the upper end of the straight part 41b.
• the curved portion 41a is formed to be curved along the side surface of the rotary drive shaft 31 so as not to contact the rotary drive shaft 31 when the rotary drive shaft 31 rotates 360 degrees (see FIG. 11).
• a communication hole CH is formed in each of the two members 41.
• the communication hole CH is provided so that the shaft center extends in the X-axis direction, and pivotally supports the shaft pin SP.
• the communication hole CH at the lower end of the link member 4 constitutes a second link portion L2.
• the two members 41 of the link member 4 are connected by two transition parts 42 having a rectangular cross section and are integrated.
• a communication hole CH is formed in each of the two members 41.
• the communication hole CH is provided so that the shaft center extends in the X-axis direction, and pivotally supports the shaft pin SP.
• the communication hole CH in the upper end portion of the link member 4 constitutes a third link portion L3.
• a fourth link portion L4 connected to a third link portion L3 is provided on the lower surface of the top plate portion 51 of the vertical guide member 5, which will be described later.
• the fourth link portion L4 includes a holding portion HP formed in a substantially cubic shape, a holding hole HH formed in the holding portion HP, and a shaft pin SP.
• the holding hole HH is formed so that its axis extends along the X-axis direction.
• Bearings BR are provided at both ends of the opening of the holding hole HH, and a shaft pin SP is rotatably supported by the bearing BR.
• the vertical guide member 5 guides the elevating frame 6 to move along the vertical direction when the elevating frame 6 is pushed up and lowered by the link member 4.
• the vertical guide member 5 includes a top plate portion 51, a guide cylindrical portion 52, and a guide rod 53.
• the top plate portion 51 is made of iron, for example, and is formed into a rectangular thick plate shape.
• the aforementioned fourth link portion L4 is provided at the center of the lower surface of the top plate portion 51. Tips of guide rods 53, which will be described later, are attached to the four corners of the lower surface of the top plate portion 51.
• the guide cylindrical portions 52 are arranged at four rectangular locations around the first opening 21.
• the guide cylindrical part 52 is formed in a cylindrical shape extending in the vertical direction, and is fixed to a mounting hole (not shown) of the base 2 by penetrating it to the middle part.
• a flange-like portion 52a is provided around the outer periphery of the intermediate portion of the guide cylindrical portion 52, so that the load applied to the guide cylindrical portion 52 from above is received by the peripheral edge of the hole in which it is attached.
• a guide rod 53 is slidably inserted into the guide cylindrical portion 52.
• the guide rod 53 is formed in the shape of a round bar extending in the vertical direction, and a guide connecting portion 64 of the elevating frame 6 is connected to the lower end.
• the elevating frame 6 comes into contact with the mold CM and plays the role of extracting the mold CM from the flask CF.
• the elevating frame 6 includes a frame body 61, a pull-out plate 62, a support plate 63, a guide connecting portion 64, and a pulley rope connecting portion 65.
• the frame main body 61 is formed, for example, from an iron plate into a substantially rectangular cylindrical shape with a ceiling portion.
• the frame main body 61 has a pair of connecting protrusions 61a that protrude outward at both ends in the X-axis direction at the upper end.
• a connecting hole (not shown) is formed in each connecting convex portion 61a and extends in the Y-axis direction, and the aforementioned guide connecting portions 64 are respectively inserted into the connecting hole and connected.
• the extraction plate 62 is formed of a rectangular plate made of iron, for example, and is adapted to come into contact with the upper surface of the sand mold portion SM formed inside the flask CF.
• the upper surface of the extraction plate 62 is supported by a support plate 63.
• the support plate 63 is made of iron and has a rectangular plate shape, for example.
• the support plate 63 is a plate member extending in the Y-axis direction and the vertical direction. The upper end of the support plate 63 is connected to the ceiling of the frame body 61.
• the support plate 63 prevents the extraction plate 62 from deforming due to the force applied to the extraction plate 62 when the mold CM (sand mold part SM) is shifted and extracted downward from the flask CF, and ensures smooth shifting and removal. Enables downward extraction work.
• the guide connecting portion 64 is made of iron, for example, and is formed of two rod-shaped members with a rectangular cross section that extend in the Y-axis direction and are lined up in the X-axis direction.
• the guide connecting portion 64 is connected to the frame body 61, which will be described later, by passing through the upper portion thereof in the Y-axis direction.
• the guide connecting portion 64 is connected to the upper surface of the frame body 61 using, for example, bolts and nuts.
• a lower end portion of the guide rod 53 is connected to the upper end surface of the guide connecting portion 64 .
• the guide rod 53 is fastened by forming a female threaded hole in the lower end of the guide rod 53, providing a through hole in the guide connecting portion 64, inserting a bolt into the through hole, and screwing the bolt into the female threaded hole.
• the pulley rope connecting portion 65 is formed of a plate material with a rectangular cross section that is long in the vertical direction, and is assembled to the frame body 61 and disposed between the two guide connecting portions 64. There is.
• the pulley rope connecting portion 65 extends in the Y-axis direction, and both ends protrude from the frame body 61.
• a connecting hole is provided at both ends, and an inner end of a wire rope 93, which will be described later, is connected to the connecting hole.
• the flask lowering control device 7 is used to hold down only the flask CF from below during extraction of the mold CM, and cooperates with the elevating frame 6 to extract the sand mold portion SM from the flask CF downward.
• the flask descent control device 7 in this embodiment serves both as a carry-in device for carrying in a poured mold and as a carry-out device for carrying out a flask CF from which the sand mold portion SM has been extracted.
• the flask descent control device 7 is, for example, a roller conveyor RCV that supports the lower ends of the flasks CF lined up in the Y-axis direction of the poured mold.
• the roller conveyor RCV has a plurality of rollers R arranged in the Y-axis direction, and these rollers R support only the lower end of the flask CF. Roller R does not support sand mold part SM.
• the roller conveyor RCV is provided with a position sensor (not shown), and the filled mold is positioned at the extraction position EP by the position sensor.
• the link biasing device 8 biases the link member 4 so that the rotary arm portion 33 rotates in the opposite direction when the elevating frame 6 is ascending.
• the link biasing device 8 has a cam member 81 provided on one side of the two long plate-shaped members 41 of the link member 4, and when pressed by the cam member 81, It includes a driven joint member 82 that generates a biasing force and pushes back the cam member 81 and the link member 4.
• the cam member 81 has a trapezoidal cross section rotated by 90 degrees when cut along an imaginary vertical plane including the Y axis.
• the upper base of the trapezoid is a vertical surface 81a facing a driven joint member, which will be described later, and the lower base is a vertical surface 81b connected in parallel to the link member 4. It has a slope 81c that connects the lower edge of the vertical surface 81a of the upper base and the lower edge of the vertical surface 81b of the lower base.
• This slope 81c corresponds to the oblique side of the trapezoid.
• This slope 81c and the vertical surface 81b of the lower base form an acute angle that expands upward.
• the cam member 81 is configured such that the slope 81c and the vertical surface 81a of the upper base abut against the driven joint member 82.
• the driven joint member 82 includes a support stand 821 protruding from the upper surface of the base 2, a bell crank part 822 swingably attached to a support shaft 820 provided on the support stand 821, and a bell crank part 822 that is swingably attached to a support shaft 820 provided on the support stand 821. It includes a guide roller section 823 provided at the lower tip, and a coil spring 824 whose one end is connected to the upper tip of the bell crank section 822.
• the other end of the coil spring 824 is connected to the support base 821 and is configured to bias the bell crank portion 822 in a direction in which the guide roller portion 823 protrudes toward the link member 4.
• a stopper part 825 is provided on the support base 821 to prevent the guide roller part 823 from protruding too much and to restrict the rotation of the bell crank part 822.
• the upward force generating device 9 is directed to the drive mechanism 3 by the downward force generated by the weight of parts such as the lifting frame 6, the link member 4, the guide rod 53 that moves in the vertical direction in conjunction with these, and the top plate 51. offset the addition of
• the upward force generating device 9 includes a pulley 91, a weight 92, a wire rope 93, and a guide rod 94, as shown in FIGS. 2 and 4.
• the gravity of the weight 92 via the pulley 91 generates an upward force.
• the pulleys 91 are provided on both sides of the first opening 21 of the base 2 at positions lined up in the Y-axis direction with the first opening 21 interposed therebetween.
• the pulley 91 is a fixed pulley supported by a pulley shaft extending in the Y-axis direction on a pulley stand 911 projecting from the upper surface of the base 2 .
• a wire rope 93 is hung around the outer periphery of the disc-shaped pulley 91.
• the inner end of the wire rope 93 is connected to the pulley rope connection part 65, and the outer end of the wire rope 93 is connected to the weight 92 via a bracket.
• the wire rope 93 passes through two holes each in the third opening 23 provided in the base 2 and is suspended.
• the weight 92 is formed, for example, in the shape of a rectangular parallelepiped, and has two guide holes 92a extending therethrough in the vertical direction.
• the guide holes 92a are provided closer to the lifting frame 6 than the bracket of the weight 92, and a guide rod 94 is slidably inserted into each guide hole 92a.
• the guide rod 94 is formed into a rod shape with a circular cross section and a uniform diameter, and extends in the vertical direction.
• the upper end of the guide rod 94 is fixed in a state where it passes through the base 2, and the lower end of the guide rod 94 extends to the lowest end position of the weight 92.
• the guide rod 94 suppresses wobbling when the weight 92 moves up and down, and guides the weight 92 so that it moves up and down quickly and smoothly.
• a vibrating conveyor VC is arranged below the pouring mold extraction device 1. Vibrations of the vibrating conveyor VC separate the casting CP and the molding sand CS while conveying them to the next process. Since the vibration conveyor VC is a known technology, its explanation will be omitted.
• Control device A control device (not shown) drives the electric motor EM and controls the rotational position of the rotational drive shaft 31.
• FIG. 2 shows a state before the poured mold extraction device 1 extracts the sand mold portion SM from the flask CF.
• the cast flask CF and the sand mold portion SM, which are filled molds, are carried to and positioned at the extraction position EP by the roller conveyor RCV.
• the elevating frame 6 is held at the rising end position.
• the axial center 32c of the rotating portion 32 is located directly above the rotation center 31c of the rotary drive shaft 31 in the vertical direction.
• the first link portion L1 of the rotary arm portion 33 is located directly above the rotation center 31c of the rotary drive shaft 31 in the vertical direction.
• the locking portion 321 is in contact with the upper end of the locked portion 331 . Further, a gap is created between the lower end AEP of the lifting frame 6 at the ascending end position and the upper end SMT of the sand mold portion SM.
• the weight 92 of the upward force generator 9 is placed at the lower end position.
• the control device rotates the rotary drive shaft 31 to rotate the rotating part 32.
• This rotation shows a state in which the rotary drive shaft 31 is rotated from 0 degrees to 180 degrees
• FIG. 8 shows a state at 90 degrees, which is the intermediate point. Note that since the rotating part 32 is integrated with the rotation drive shaft 31, the rotation part 32 rotates in conjunction with the rotation drive shaft 31, although the shaft center 32c is eccentric from the rotation center 31c.
• the locking part 321 is at a position separated from the lower end of the locked part 331 and rotated 90 degrees together with the rotating part 32.
• the rotating arm portion 33 does not rotate because the first link portion L1 is pulled upward by the upward force generating device 9, and the axis 32c of the rotating portion 32 descends to the same height as the rotation center 31c of the rotation drive shaft 31. . Therefore, the rotary arm portion 33 is lowered at the 90 degree position by the amount of eccentricity between the rotation center 31c of the rotary drive shaft 31 and the axis 32c of the rotary portion 32. As a result, the link member 4 lowers the elevating frame 6.
• FIG. 9 shows a state in which the rotating part 32 is rotated by 180 degrees while continuing the previous state.
• the length from the lower end AEP at the ascending end position to the lowered shifting process end position SMT1 is the first stroke FS that occurs when the rotating part is rotated 180 degrees.
• the locking part 321 is in contact with the lower end of the locked part 331. This makes it impossible for the rotating section 32 to rotate counterclockwise relative to the rotating arm section 33 in FIG. 9 . Therefore, when the rotary drive shaft 31 rotates 180 degrees or more, the rotary arm section 33 rotates counterclockwise together with the rotary section 32 while the rotary drive shaft 31 rotates from 180 degrees to 360 degrees. becomes.
• FIG. 10 shows a state in which the rotary drive shaft 31 is at the midpoint of 270 degrees.
• the first link portion L1 of the rotary arm portion 33 is horizontally aligned with the rotation center 31c of the rotary drive shaft 31. Therefore, the lower part of the link member 4 swings horizontally.
• the link member 4 largely pulls down the vertical guide member 5 at the upper part. Along with this, the elevating frame 6 is lowered significantly, and the sand mold portion SM is extracted from the flask CF (removal step).
• FIG. 11 shows a state in which the rotary drive shaft 31 has rotated to a 360 degree position.
• the length by which the rotary drive shaft 31 rotates from 180 degrees to 360 degrees and rotates the rotary arm portion 33 to lower the elevating frame 6 is the second stroke SS. This is the length from the shifting process end position SMT1 to the pulling down process ending position SMT2.
• the contact surface 33b of the rotary arm portion 33 contacts the rotary arm stopper AS to restrict further rotation of the rotary arm portion 33.
• the cam member 81 presses the guide roller part 823 and rotates the bell crank part 822 counterclockwise (in FIG. 11). As a result, the coil spring 824 is stretched, producing a biasing force that biases the bell crank portion 822 in the clockwise direction.
• FIG. 12 shows a state in which the extracted sand mold part SM is conveyed to the next process by the vibrating conveyor VC.
• the sand mold portion SM is completely extracted from the flask CF and conveyed while being vibrated by a vibrating conveyor VC so as to be separated into a casting CP and a casting sand CS.
• the control device raises the elevating frame 6 by rotating the rotary drive shaft 31 in the reverse direction (rotating clockwise in FIG. 11).
• the link member 4 is biased in the direction in which the rotary arm portion 33 rotates in the opposite direction, it is possible to smoothly and reliably reverse the rotation and raise the elevating frame 6.
• the flask CF is conveyed to the downstream side by a roller conveyor RCV, and a new flask CF before extraction is carried into the extraction position EP from the upstream side. Repeat the above operations in the same manner.
• the drive mechanism 3 includes an electric motor EM and a rotational drive shaft 31 driven by the electric motor EM, a link member 4 that extends in the vertical direction and has its lower part connected to the drive mechanism 3; a vertical guide member 5 that is connected to the upper part of the link member 4 and guides the link member 4 by converting its movement in the vertical direction; It is equipped with
• It is connected to the vertical guide member 5 and comes into contact with the upper surface of the sand mold part SM that is inside the flask CF of the poured mold, and moves up and down based on the movement of the vertical guide member 5 in the vertical direction. It is provided with a frame 6 and a flask lowering regulating device 7 that supports the flask CF of the poured mold and restricts the flask CF from moving downward.
• the drive mechanism 3 cooperates with the flask lowering regulating device 7 to relatively move the lifting frame 6 downward by a predetermined length in order to separate the sand mold part SM from the adhered flask CF.
• the poured mold extraction device 1 is divided into a shifting part (rotating part 32) which requires a large force with a short stroke, and a pulling part (rotating arm part 33) which requires a long stroke and high speed.
• the shifting part (rotating part 32) is a cylindrical member having an axis 32c that is parallel to the rotation center 31c of the rotation drive shaft 31 and eccentric from the rotation center 31c of the rotation drive shaft 31 by a predetermined dimension.
• a rotating part 32 is provided.
• the pull-out part (rotating arm part 33) is a rotary arm part 33 that extends in the radial direction of the rotary part 32 and has a predetermined rotation radius, and has a base end side that relatively extends around the outer periphery of the rotary part 32. It has an opening holding part 33a that is rotatably held, and a rotary arm part 33 having a first link part L1 on the distal end side.
• the link member 4 includes a second link part L2 rotatably connected to the first link part L1 of the rotating arm part 33 at one end, a third link part L3 at the other end, and a vertical guide member.
• 5 includes a fourth link portion L4 rotatably linked to the third link portion L3.
• the rotating arm portion 33 is provided with a rotation angle regulating portion (locking portion 321, locked portion 331) that rotates together with the rotating arm portion 33.
• the eccentric axis 32c moves from above the rotation center 31c to below the rotation center 31c due to the rotation of the rotating part 32, thereby lowering the link member 4 by the distance necessary for shifting.
• the rotating part 32 and the opening holding part 33a of the rotating arm part 33 rotate (idle) relative to each other, and the rotating arm part 33 does not rotate, so the link member 4 is moved by the rotating part 32. Descend the required distance.
• the rotation angle regulating part controls the rotation arm part 33 relative to the rotating part 32.
• the rotating (idling) state is released, the rotating arm portion 33 rotates, and the first link portion L1 of the rotating arm portion 33 moves from above the rotation center 31c to below the rotation center 31c, so that the link member 4 further lower.
• the shifted sand mold portion SM can be completely extracted downward from the flask CF.
• the eccentric predetermined dimension of the shifting part (rotating part 32) generates a first vertical stroke FS necessary to shift the poured sand mold part SM in the flask CF from the inner wall of the flask CF.
• the rotational torque of the electric motor EM generates the force necessary for shifting in the rotating part 32
• the dimension of the predetermined rotation radius of the rotating arm part 33 is such that the force required for displacing the flask CF is This is a dimension for producing a second stroke SS in the vertical direction necessary for extracting the sand mold portion SM downward.
• the "dimension for producing” does not refer to the first stroke FS itself, but to a directly or indirectly related dimension, such as 1/2 of the first stroke, for example. The same applies to the second stroke SS.
• the dimension of the eccentric position of the rotating part 32 that is deviated from the rotation center 31c of the rotary drive shaft 31 by a predetermined dimension is determined by the force required to separate the poured mold in the flask CF from the flask inner wall. and a first stroke FS, and the force required to draw the flask downward after separation from the flask inner wall in the flask CF and It is assumed that a second stroke SS is generated.
• the distance from the rotation center 31c of the rotation drive shaft 31 to the center of the first link L1 rotated by the rotation arm section 33 is longer than the distance from the rotation center 31c of the rotation drive shaft 31 to the axis 32c of the rotation part 32. Therefore, if the angular velocity of the rotary drive shaft 31 is the same, the rotational speed of the rotary arm section 33 will be faster than the rotational speed of the rotary section 32, and thus the speed of the first stroke accompanying the rotation of the rotary section 32 will be faster than that of the rotary arm section 33. The speed is slower than the second stroke speed caused by the rotation of the portion 33.
• the torque is determined by multiplying the "distance from the rotation center 31c" by the "force in the circumferential direction.” Therefore, even if the torque from the electric motor EM generated on the rotational drive shaft 31 is the same, the force of the first stroke accompanying the rotation of the rotating part 32 whose distance from the rotational center 31c is short is greater than the force of the first stroke when the distance from the rotational center 31c is shorter. The force is greater than the force of the second stroke caused by the rotation of the long rotating arm portion 33.
• the electric motor EM which is the only drive source, can efficiently set a high output range due to the slow downward movement of the first stroke FS and a low output area due to the high speed downward movement of the second stroke SS, depending on the load.
• a link urging device 8 is provided which urges the link member 4 so that when the elevating frame 6 is raised, the rotary arm portion 33 rotates in the opposite direction to when it is lowered.
• the link biasing device 8 is provided so as to press the link member 4 by a predetermined amount in the direction opposite to the downward motion at the lowering end position of the elevator frame 6.
• the rotating arm section 33 smoothly rotates in the opposite direction to when descending. Thereby, the raising operation can be carried out quickly and reliably.
• the parts group including the lifting frame 6 and the link member 4 can reduce the downward force that affects the rotation of the rotating part 32 and the rotating arm part 33 due to their own weight by generating an upward force of at least the same value.
• a countervailing upward force generator 9 is provided.
• the rotational speed of the rotary drive shaft 31 will be higher than the rotational speed of the rotary drive shaft 31 in the descending process to extract the mold CM. Also, there is a possibility that the lowering speed of the elevating frame 6 becomes faster. In such a case, there is a possibility that the drive mechanism 3 may not operate as desired.
• the upward force generating device 9 that offsets the downward force can suppress rotation of the rotary arm portion 33 during the first stroke FS of the downward stroke. Further, in the second stroke SS of the lowering step, it is possible to prevent the locking portion 321 and the locked portion 331 from separating.
• the upward force generating device 9 generates an upward force by the gravity of the weight 92 via the pulley 91. According to this, the downward force that affects the operation of the drive mechanism 3 can be canceled out by a simple mechanism using the gravity of the weight 92 without providing a device that generates a dedicated drive force.
• the upward force generating device 9 is a weight 92 via a pulley 91
• the present invention is not limited thereto.
• a counterbalance valve may be used.
• a hydraulic cylinder can be used to receive back pressure generated by the weight of a group of parts including the lifting frame and prevent the lifting frame from descending.

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• 2023
  • 2023-08-21 JP JP2024542816A patent/JPWO2024043217A1/ja active Pending
  • 2023-08-21 WO PCT/JP2023/030061 patent/WO2024043217A1/ja not_active Ceased

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