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
  • B22D29/08—Strippers actuated mechanically
• • 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 and a mold extraction method for extracting a poured mold from a flask.
• Patent Document 1 Conventionally, as a method of extracting a poured mold from a flask, there is a method of pulling the mold from below to directly above using a cylinder device, as shown in Patent Document 1.
• the main purpose of this method is to slowly cool the product within the mold for a certain period of time after extracting the product from the mold without breaking the mold as much as possible.
• hydraulic cylinders require a hydraulic unit to operate and control the cylinder, and during production, the hydraulic pump motor is often operated constantly, resulting in an increase in electric power consumption.
• a rotary arm portion having a length of 1/2 of the lifting stroke is provided on the rotary drive shaft, and the mold is pulled out with one rotary arm portion. It is a structure.
• the initial stage of extraction requires a short stroke but a large pressure; ) It does not require much force to pull it out, but it does require a slightly longer stroke. Therefore, when an electric motor is used, the torque generated on the rotary drive shaft when the mold is removed from the inner wall of the flask at the initial stage of extraction is excessive, and there is a problem in that the drive system becomes larger in order to increase its strength. . Further, in order to generate a large torque, the rotational speed of the rotary arm portion is slowed down, resulting in a problem that the lifting operation takes time.
• the present invention was made in view of the conventional problems, and its purpose is to use an electric motor to generate a large torque at the initial stage in a mold extraction device, and to speed up the subsequent extraction operation. It is an object of the present invention to provide a device for extracting a poured mold and a method for extracting the mold, which can be performed at high speed.
• the drive mechanism includes an electric motor, a rotational drive shaft driven by the electric motor, and a drive mechanism that is located inside the flask of the poured mold.
• an elevating frame that supports the lower surface of the sand mold part so that it can be raised and lowered, a link member that extends in the vertical direction and is provided between the drive mechanism and the elevating frame, and when the elevating frame is raised, A rise regulating device that comes into contact with the outer periphery of the flask to restrict the rise of the flask is provided.
• the drive mechanism moves the elevating frame upward in cooperation with the rise regulating device in order to separate the sand mold part from the adhered mold flask at the extraction position where the sand mold part is extracted from the flask.
• the mold extraction device by dividing the mold extraction device into a shifting section that requires a large force with a short stroke, and an extraction section that requires a long stroke and high speed, 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, and a third link portion at the other end, and the elevating frame includes: A fourth link portion is provided which is 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 rotation of the rotating part moves the eccentric axis from below the center of rotation to above the center of rotation, thereby raising 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 rises by the distance required for displacement 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 below the rotation center to above the rotation center, thereby further raising the link member. This allows the shifted sand mold portion to be pulled up to the position where it will be transported.
• the eccentric predetermined dimension of the shifted portion The dimensions are for generating the first stroke in the vertical direction necessary to displace the sand mold from the inner wall of the flask, and at the same time, the force necessary for displacing the sand mold is generated in 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 pulling up the sand mold part separated from the flask. 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.
• the force and second stroke necessary for lifting the flask after it has been separated from the inner wall of the flask shall be generated so that the radius of rotation is a predetermined dimension from the center of rotation of the rotating arm portion.
• the electric motor which is the only drive source, can efficiently set a high output range due to a slow increase in the first stroke and a low output area due to a high speed increase in the second stroke, depending on the load.
• the rotary arm portion when the elevating frame is lowered, the rotary arm portion is moved in a direction opposite to when the lifting frame is raised.
• a link biasing device is provided for biasing the link member to rotate.
• the rise regulating device is configured to control the upper flask of the flask.
• a pneumatic switching valve provided between the pneumatic pump and an air layer of the oil tank; a pneumatic pump that applies pressure to air and sends it out; Hydraulic oil is supplied to the hydraulic switching valve by air pressure applied to an air layer in the oil tank.
• the large back pressure generated at the initial stage of mold removal can be absorbed by the hydraulic cylinder and hydraulic pressure, without using a hydraulic unit. It can be stopped by the pressure resistance of the switching valve.
• an electric motor, a drive mechanism driven by the electric motor, and a lower surface of the sand mold portion that is inside the flask of the poured mold are supported.
• an elevating frame that can be raised and lowered; a link member that extends in the vertical direction and is provided between the drive mechanism and the elevating frame;
• the sand mold part is vertically moved in cooperation with the rise regulating device to separate the sand mold part from the adhered mold flask.
• a shifting process in which the sand mold part is relatively shifted by a predetermined length, and a pulling-out process in which the shifted sand mold part is pulled out to a conveyance position with a force smaller than the shifting force in the shifting process and at a speed faster than the shifting speed in the shifting process. It has a process and.
• 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.
• FIG. 3 is a plan view showing the positional relationship of the rise regulating device with respect to the flask. 2 is a sectional view taken along IV-IV in FIG. 1.
• FIG. 3 is a diagram of the rotational drive shaft and the rotating section viewed from the X-axis direction.
• FIG. 3 is a diagram of the rotational drive shaft and the rotating section viewed from the Y-axis direction.
• 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.
• FIG. 3 is a plan view showing the positional relationship of the rise regulating device
• FIG. 2 is a sectional view taken along line VII-VII in FIG. 1; It is a figure which shows the state which rotated the rotary drive shaft by 90 degrees. It is a figure which shows the state which rotated the rotary drive shaft by 180 degrees.
• 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. It is a figure which shows the state in which the extracted sand mold part is conveyed. It is a figure which shows the pouring mold extraction apparatus in another example.
• 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. It
• FIG. 3 is a diagram of the rotational drive shaft and the rotating section viewed from the X-axis direction.
• FIG. 3 is a diagram of the rotational drive shaft and the rotating section viewed from the Y-axis direction. It is a graph showing the relationship between hydraulic pressure output for extraction and stroke in a conventional pouring mold extraction device using hydraulic pressure.
• the horizontal direction 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 centerline is called the inside
• the side farther from the centerline is called the outside.
• the poured mold extraction device 1 in the embodiment includes an electric motor 2, a drive mechanism 3, an elevating frame 4, a link member 5, and a rise regulating device 7.
• the poured mold extraction device 1 is installed so that a portion of its lower part is housed in a trench TR dug in the floor FL. Most parts of the pouring mold extraction device 1 are installed on a base frame BF that is horizontally suspended over the upper end of the trench TR facing each other in the X-axis direction.
• the base frame BF is made of iron and has a rectangular frame shape, for example. Between the opposing long sides BF1, five horizontal rails BF2 are horizontally suspended so as to extend in the Y-axis direction. The long side portion BF1 and the horizontal bar portion BF2 are formed so that their height positions are the same on the upper end surface and the lower end surface.
• the first horizontal bars BF2a and the fourth horizontal bars BF2d from the left side in FIG.
• a lower end portion of a support leg portion 6 of a pouring mold extraction device 1, which will be described later, is fixedly supported.
• the second horizontal bar BF2b the third horizontal bar BF2c, and the fifth horizontal bar BF2e from the left in FIG. is fixed.
• a rotary encoder RE for example, is attached as a rotation angle sensor to the lower end surface of the first horizontal bar BF1a from the left side in FIG. 1 in the horizontal bar portion BF2.
• the electric motor 2 drives a drive mechanism 3, which will be described later.
• an induction motor can be used as the electric motor 2.
• An induction motor is a type that does not require complicated control like a servo motor.
• the electric motor 2 is attached to the upper surface of the right end of the base frame BF in FIG. 1 via a pedestal.
• a small sprocket 21 is attached to the outer periphery of the output shaft of the electric motor 2.
• a large sprocket 22 having a larger diameter than the small sprocket 21 is provided at one end of the rotational drive shaft 31 of the drive mechanism 3 so as to face the small sprocket 21 .
• the rotation axis of the small sprocket 21 and the rotation axis of the large sprocket 22 are provided parallel to each other.
• An endless annular roller chain 23 is hung between the large sprocket 22 and the small sprocket 21 to transmit the rotational torque of the electric motor 2 to the rotational drive shaft 31.
• the drive mechanism 3 is driven by the electric motor 2 and moves up and down a link member 5 that raises and lowers an elevating frame 4, 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 frame BF 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 22 having a large outer diameter is attached to the right end of the rotation drive shaft 31 in FIG. 1 so as to be relatively non-rotatable.
• the rotation center of the large sprocket 22 is configured to be coaxial with the axis 32c 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 rotary drive shaft 31. As shown in FIGS. 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.
• 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).
• the locking portions 321 are provided on both sides of the rotating portion 32 along the X-axis direction so as to sandwich the rotating portion 32, and are integrally assembled to the rotational 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. come into contact with 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.
• 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 5 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 51 of the link member 5, which will be described later.
• an abutting surface 33b is provided on the side surface of the rotating arm section 33, which is the forward side of rotation when the rotating arm section 33 rotates to raise the link member 5.
• 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.
• This contact surface 33b is a rotating arm stopper AS provided so as to protrude inside the long side BF1 of the base frame BF when the rotating arm 33 rotates and the elevating frame 4 reaches the rising end. comes into contact with.
• the rotating arm stopper AS includes a cylindrical female threaded tube fixed inside the long side portion BF1 so that its axis extends in the Y-axis direction, a bolt whose base end is screwed into the female threaded tube, and a bolt. It has a nut screwed onto it.
• the link member 5 transmits the driving force of the drive mechanism 3 to the lifting frame 4, which will be described later.
• the link member 5 includes two long plate-shaped members 51 made of iron and extending in the vertical direction, for example.
• the two members 51 are overlapped with a gap and formed integrally.
• a curved portion 51a having a second link portion L2 at the lower end is formed at each lower portion.
• a straight part 51b continuous to the curved part 51a is formed in the upper part, and a third link part L3 is provided at the upper end of the straight part 51b.
• the curved portion 51a is formed to be curved along the side surface of the rotational drive shaft 31 so as not to contact the rotational drive shaft 31.
• a communication hole CH is formed in each of the two members 51.
• 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 lower end portion of the link member 5 constitutes the second link portion L2.
• the two members 51 of the link member 5 are connected by two transition parts 52 having a rectangular cross section and are integrated.
• a communication hole CH is formed in each of the two members 51.
• 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 5 constitutes a third link portion L3.
• a fourth link portion L4 that connects with the third link portion L3 is provided on the lower surface of the bottom of the elevating frame 4.
• 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 elevating frame 4 which will be described later, is guided to move along the vertical direction by a guide section 61 provided on the support leg section 6 fixed on the base frame BF.
• the support leg portion 6 is made of iron, for example, and has a substantially rectangular cylindrical shape.
• the support leg part 6 has two long sides BF1 whose lower ends extend in the X-axis direction of the base frame BF, a first horizontal bar BF2a (in FIG. 1), and a fourth horizontal bar BF2a (in FIG. 1). It is fixed to a rectangular frame formed by the horizontal bar BF2d.
• the support leg portion 6 includes four side portions 6a, 6b and a top plate portion 6c, and is formed into a tower shape as a whole.
• One of the side surfaces 6a of the support leg portion 6 arranged in the Y-axis direction is formed with a slope 6a1 whose lower part slopes outward.
• This slope 6a1 prevents the curved portion 51a of the link member 5 from contacting the support leg portion 6 when the rotating arm portion 33 rotates to the horizontal position.
• the two side surfaces 6b of the support leg 6 arranged in the X-axis direction are formed into a rectangular upper part and a trapezoidal lower part in accordance with the shape of the side surface parts 6a arranged in the Y-axis direction.
• the upper and lower parts are continuous and integral.
• a rectangular top plate portion 6c is provided at the upper end of the support leg portion 6.
• the top plate portion 6c is provided with a rectangular through hole 6c1 through which the link member 5 passes and an attachment hole 6c2 into which the guide portion 61 is fixed (see FIG. 4).
• the through hole 6c1 is formed in a size that allows the link member 5 to be loosely inserted therein.
• the attachment holes 6c2 are provided on both sides of the through hole 6c1 along the X-axis direction.
• the guide portion 61 includes a guide cylindrical portion 61a and a guide rod 61b.
• the guide cylindrical portion 61a is formed in a cylindrical shape extending in the vertical direction, and is fixed with a lower portion thereof passing through the attachment hole 6c2.
• a flange-like part 61c is provided around the lower outer periphery of the guide cylindrical part 61a, so that the load applied to the guide cylindrical part 61a from above is received at the peripheral edge of the mounting hole 6c2.
• a guide rod 61b is slidably inserted into the guide cylindrical portion 61a.
• the guide rod 61b is formed in the shape of a round bar extending in the vertical direction, and the elevating frame 4 is attached to the upper end.
• the guide portion 61 guides the elevating frame 4 so that it moves along the vertical direction when the elevating frame 4 is pushed up and pulled down by the link member 5.
• the elevating frame 4 includes a lifting plate 41, a support plate 42, a fourth link L4, and a cover member 43.
• the punching plate 41 is a rectangular plate made of iron, for example, and is adapted to support the lower surface of the sand mold portion SM formed inside the flask CF.
• the lower surface of the pull-out plate 41 is supported by a support plate 42.
• the support plate 42 is made of iron and is formed into a rectangular thick plate shape. The support plate 42 prevents the punching plate 41 from deforming due to the force applied to the punching plate 41 when the mold (sand mold portion SM) is shifted and pulled out from the flask CF, and ensures smooth shifting and lifting. Enables extraction work.
• a cover member 43 is provided on the pull-out plate 41.
• the cover member 43 is formed into a substantially rectangular cylindrical shape, continues to the lower surface of the pull-out plate 41 at its upper end, and is provided so as to surround the four side surfaces of the support plate 42 .
• the cover member 43 extends in the lower part to near the lower end of the support leg part 6, thereby covering the guide part 61, the link member 5, and the support leg part 6, and prevents spilled sand when removing the sand mold part SM. Preventing the inside of the drive mechanism 3 from entering.
• the cover member 43 has an inclined surface formed on one of the side surfaces arranged in the Y-axis direction so as to correspond to the shape of the lower part of the support leg part 6, and the side surfaces arranged in the X-axis direction have a rectangular upper part and a lower part. is formed in a continuous trapezoidal shape on the top of the rectangular shape.
• the lift regulating device 7 is used to hold down only the flask CF from above during mold extraction, and is used when the sand mold portion SM is extracted upward from the flask CF by the elevating frame 4.
• the rise regulating device 7 includes a hydraulic cylinder device 71, a hydraulic switching valve 72, an oil tank 73, a pneumatic switching valve 74, and a pneumatic pump AP.
• the hydraulic cylinder device 71 includes a cylinder portion 71a, a piston portion 71b, and a piston rod 71c.
• the cylinder portions 71a are fixed to the lower surfaces of the four corners of the support frame HF so as to face the four corners of the upper flask to be extracted (see FIG. 3).
• the support frame HF is a part of the structure, and is formed into a square frame shape with an opening in the center using a member having a rectangular cross section.
• the lower surface of the support frame HF is set at approximately the same height as the rising end of the elevating frame 4.
• the cylinder portion 71a includes an opening that opens downward, and a piston rod 71c whose upper end is connected to a piston portion 71b within the cylinder portion 71a advances and retreats from the opening.
• the piston rod 71c is made of iron and has a rod shape, for example.
• the lower end of the piston rod 71c comes into contact with a corner of the upper end surface of the flask CF from which the sand mold portion SM is extracted.
• the cylinder part 71a shall contact
• a pair of cylinder portions 171a may be provided so as to contact the center portions of opposite sides of the upper flask.
• the oil tank 73 is set so that an oil layer 73a in which hydraulic oil is stored is formed in the lower part, and an air layer 73b filled with air is formed in the upper part.
• a hydraulic switching valve 72 (electromagnetic switching valve) is provided between the oil tank 73 and the cylinder portion 71a, and a control device controls the supply and stop of hydraulic oil.
• the upper part of the oil tank 73 where the air layer 73b is located is communicated with a pneumatic pump AP via an air pipe 76.
• a pneumatic switching valve 74 (electromagnetic switching valve) is provided between the oil tank 73 and the pneumatic pump AP to adjust the air pressure in the cylinder portion 71a and the oil tank 73.
• the link biasing device 8 biases the link member 5 so that when the elevating frame 4 is lowered, the rotary arm portion 33 rotates in a direction opposite to that when the lift frame 4 is raised.
• the link biasing device 8 has a cam member 81 provided on one side of the two long plate-shaped members 51 of the link member 5, and when pressed by the cam member 81, It includes a driven joint member 82 that generates an urging force and pushes back the cam member 81 and the link member 5.
• 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 5.
• It has a slope 81c that connects the upper edge of the vertical surface 81a of the upper base and the upper 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 downward.
• 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 fixed to the vertical wall inside the support leg part 6, a bell crank part 822 swingably attached to a support shaft 820 provided on the support stand 821, and a bell crank part 822. It includes a guide roller part 823 provided at the upper end of the bell crank part 822, and a coil spring 824 whose one end is connected to the lower end of the bell crank part 822.
• the other end of the coil spring 824 is connected to a mounting piece provided at the upper end corner inside the support leg 6 and biases the bell crank 822 in the direction in which the guide roller 823 protrudes toward the link member 5. It is configured like this.
• the support base 821 is provided with a stopper part 825 that prevents the guide roller part 823 from protruding too much and restricts the rotation of the bell crank part 822.
• roller conveyor At a height position when the lifting plate 41 of the lifting frame 4 is at the lower end, and at a horizontal position (extracting position EP) where the lifting plate 41 can support the sand mold part SM, there is a horizontal position (extracting position EP) extending in the X-axis direction.
• the flask CF is conveyed by the existing roller conveyor RC.
• the flask CF with a mold before being extracted is carried to an extraction position EP by a roller conveyor RC, and is positioned by a position sensor (not shown).
• the flask CF after being extracted is carried out from the extraction position EP. Since the roller conveyor RC is a known technology, its explanation will be omitted.
• the sand mold portion SM extracted from the flask CF is conveyed to the next step by a mold conveying device provided at the height position from which it was extracted.
• a belt conveyor BC can be used as the mold conveyance device.
• Control device A control device (not shown) drives the electric motor 2 and controls the rotational position of the rotational drive shaft 31.
• the control device also controls switching operations of the hydraulic switching valve 72 and the pneumatic switching valve 74.
• 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 part SM, which are filled molds, are carried to and positioned at the extraction position EP by the roller conveyor RC.
• the elevating frame 4 is held at the lowering end position FEP.
• the axis 32c of the rotating part 32 and the locking part 321 are located directly below 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 below the rotation center 31c of the rotary drive shaft 31 in the vertical direction.
• the locking portion 321 is in contact with the lower end of the locked portion 331 . Further, a gap is formed between the upper end of the lifting frame 4 and the lower end of the sand mold portion SM.
• a pneumatic switching valve 74 is positioned at a port that communicates the pneumatic pump AP with the opening side of the hydraulic cylinder device 71.
• the hydraulic switching valve 72 is positioned at a port that communicates the oil layer 73a of the oil tank 73 with the cap side of the hydraulic cylinder device 71. As a result, the piston rod 71c is held at the raised position without contacting the flask CF that has been carried in.
• 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, and the axis 32c of the rotating portion 32 rises to the same height as the rotation center 31c of the rotation drive shaft 31. Therefore, the rotary arm portion 33 is raised 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 5 raises the elevating frame 4.
• an approach is taken to close the gap between the lifting frame 4 and the sand mold part SM, and then a "misalignment" is created between the casting flask CF and the sand mold part SM.
• the control device first positions the port of the pneumatic switching valve 74 so that the pneumatic pump AP and the air layer 73b of the oil tank 73 communicate with each other. After the oil pressure increases and the piston rod 71c advances, the oil pressure switching valve 72 is switched to the cutoff position, and the state in which the piston rod 71c presses the upper end of the flask CF is maintained.
• 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 lowering end position FEP to this raised position is the first stroke FS that occurs when the rotating part is rotated 180 degrees.
• the locking part 321 is in contact with the upper end of the locked part 331. This makes it impossible for the rotating section 32 to rotate clockwise 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 portion 33 rotates clockwise together with the rotary portion 32 while the rotary drive shaft 31 rotates from 180 degrees to 360 degrees. Become.
• 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 5 swings horizontally.
• the link member 5 pushes up the elevating frame 4 greatly at the upper part, and pulls out the sand mold part SM from the flask CF.
• 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 push up the elevating frame 4 is the second stroke SS.
• 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 clockwise (in FIG. 11). As a result, the coil spring 824 is stretched, creating a biasing force that biases the bell crank portion 822 in the counterclockwise direction.
• the control device positions the port of the pneumatic switching valve 74 so that the oil tank 73 communicates with the atmosphere and the pneumatic pump AP communicates with the opening side of the hydraulic cylinder device 71.
• the control device positions the hydraulic switching valve 72 at a port where the oil layer 73a of the oil tank 73 and the cap side of the hydraulic cylinder device 71 communicate.
• the sand mold part SM is completely extracted from the flask CF and raised to the height position of the belt conveyor BC where it is transported.
• FIG. 12 shows a state in which the extracted sand mold portion SM is conveyed to the next process by the belt conveyor BC.
• the control device lowers the elevating frame 4 by rotating the rotary drive shaft 31 in the reverse direction (rotating counterclockwise in FIG. 11). At this time, since the link member 5 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 lower the elevating frame 4.
• the flask CF is conveyed to the downstream side by a roller conveyor RC, and a new flask CF before extraction is carried from the upstream side to the extraction position EP.
• the drive mechanism 3 includes an electric motor 2 and a rotational drive shaft 31 driven by the electric motor 2;
• An elevating frame 4 that supports the lower surface of the sand mold part SM, which is the inside of the flask CF of the poured mold, and enables it to be raised and lowered; and a rise regulating device 7 that comes into contact with the outer periphery of the flask CF to restrict the rise of the flask CF when the elevating frame 4 rises.
• the drive mechanism 3 works with the lift regulating device 7 to move the lifting frame 4 upward in order to separate the sand mold part SM from the adhered mold flask CF.
• the shifting section (rotating section 32) and the shifted sand mold part SM are transported by a force smaller than the shifting force at the shifting section and at a speed faster than the shifting speed at the shifting section. It is provided with a pull-out part (rotary arm part 33) that pulls out to position TP.
• the device by dividing the pouring mold extraction device 1 into a shifting section that requires a large force with a short stroke, and an extraction section that requires a high speed with a long stroke, the device It is possible to reduce the size of the machine and improve work efficiency.
• the shifting portion is an axis 32c parallel to the rotation center 31c of the rotation drive shaft 31, and is eccentric by a predetermined dimension from the rotation center 31c of the rotation drive shaft 31.
• the rotating part 32 has a cylindrical shape and has an axial center 32c.
• the pull-out part is a rotating arm part 33 that extends in the radial direction of the rotating part 32 and has a predetermined rotation radius, and is capable of relatively rotating around the outer periphery of the rotating part 32 on the base end side.
• the rotary arm part 33 has an opening holding part 33a that holds the opening holding part 33a, and a rotating arm part 33 having a first link part L1 on the distal end side.
• the link member 5 has 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 is connected to the elevating frame 4. is provided with 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 due to the rotation of the rotating part 32 moves from below the rotation center 31c to above the rotation center 31c, thereby raising the link member 5 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. Climb only the required distance.
• the rotation angle regulating device (locking part 321, locked part 331) causes the rotation arm part 33 to rotate 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 below the rotation center 31c to above the rotation center 31c, so that the link member 5 further increase.
• the shifted sand mold portion SM can be pulled up to the conveyed position EP.
• the predetermined dimension by which the axis 32c of the rotating part 32 is eccentric from the rotation center 31c of the rotational drive shaft 31 is necessary to shift the poured sand mold part SM in the flask CF from the inner wall of the flask CF. It is a dimension for generating the first stroke FS in the vertical direction, and at the same time generates the force necessary for displacement in the rotating part 32 from the rotational torque of the electric motor 2, and a predetermined rotation radius of the rotating arm part 33.
• the dimension is a dimension for producing the second stroke SS in the vertical direction necessary for pulling up the sand mold portion SM separated from the flask CF.
• the eccentric dimension at a position deviated by a predetermined dimension from the rotation center 31c of the rotary drive shaft 31 is determined by the force necessary to separate the poured mold (sand mold portion SM) in the flask CF from the flask inner wall.
• the first stroke FS is defined as a rotation radius of a predetermined distance from the rotation center 31c of the rotary arm portion 33, and the force required for lifting the flask after detachment from the inner wall of the flask is defined as the second stroke SS.
• the distance from the rotation center 31c of the rotation drive shaft 31 to the center of the first link part L1 rotated by the rotation arm part 33 is longer than the distance between the rotation center 31c of the rotation drive shaft 31 and 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 rotating section 32, and therefore the speed of the first stroke FS accompanying the rotation of the rotating section 32 will be faster than the rotational speed of the rotating arm section 33. The speed is slower than the speed of the second stroke SS due to the rotation of the arm 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 2 generated on the rotational drive shaft 31 is the same, the force of the first stroke FS accompanying the rotation of the rotating part 32 whose distance from the rotational center 31c is short is greater than the distance from the rotational center 31c. is larger than the force of the second stroke SS due to the rotation of the long rotating arm portion 33.
• a high output range due to a slow increase in the first stroke FS and a low output area due to a high speed increase in the second stroke SS can be efficiently set according to the load using a single drive source of the electric motor 2.
• a link biasing device 8 is provided that biases the link member 5 so that when the elevating frame 4 is lowered, the rotary arm portion 33 rotates in the opposite direction to when it is raised.
• the link biasing device 8 is provided so as to press the link member 5 by a predetermined amount in the direction opposite to the upward movement at the rising end position of the lifting frame 4.
• the rise regulating device 7 includes at least one pair of hydraulic cylinder devices 71 having a piston rod 71c that can come into contact with the outer peripheral upper surface of the upper flask in the flask CF, an oil layer 73a storing hydraulic oil, and an oil layer 73a.
• An oil tank 73 having an air layer 72b formed above, a hydraulic switching valve 72 provided between the oil tank 73 and the hydraulic cylinder device 71, a pneumatic pump AP that applies pressure to air and sends it out, and a pneumatic pump.
• a pneumatic switching valve 74 is provided between the AP and the air layer 73b of the oil tank 73. This is done using the air pressure applied.
• hydraulic oil is supplied to the hydraulic switching valve 72 by air pressure via the oil tank 73, so that the large exhaust pressure generated at the initial stage of mold removal can be transferred to the hydraulic cylinder without using a hydraulic unit. This can be stopped by the pressure resistance of the device 71 and the hydraulic switching valve 72.
• an electric motor 2 a drive mechanism 3 driven by the electric motor 2
• an elevating frame 4 that supports the lower surface of the sand mold part SM which is the inside of the flask CF of the poured mold and can be raised and lowered
• a link member 5 extending in the direction and provided between the drive mechanism 3 and the lift frame 4 contacts the outer periphery of the flask CF to restrict the rise of the flask CF when the lift frame 4 rises.
• the sand mold part SM is moved in the vertical direction in cooperation with the rise regulating device 7 to separate from the adhered mold part CF.
• the shifting part moves the sand mold part SM by a predetermined length relative to the shifting part SM with a force smaller than the force of shifting in the shifting process and at a speed faster than the shifting speed in the shifting process. and a pulling-up step in which the paper is pulled up to the transport position TP by a pulling-out section (rotary arm section 33).
• the shifting part (rotating part 32) requires a large force with a short stroke, and the pulling part (rotating arm part 33) which requires a long stroke and high speed.
• the rotating part 32 constituting the shifting part has a short cylindrical shape provided around the rotational drive shaft 31, but the present invention is not limited to this.
• it may be configured in the shape of a crankshaft together with the rotary drive shaft 131 as shown in FIGS. 13 to 15.
• the two rotating parts 132 are connected by a narrow shaft 140 that is eccentric from the rotation center 131c of the rotary drive shaft 131, and are configured to sandwich a rotating arm part 133 forming a pull-out part from both sides.
• the locking portions 1321 are integrally formed so as to protrude in the radial direction from the peripheral edges of the two rotating portions 132.
• the locked portions 1331 are integral with the rotating arm portion 133, but are provided on both sides of the rotating arm portion 133 in correspondence with the two locking portions 1321.
• the other configurations are the same as those of the above embodiment.

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• 2023
  • 2023-08-21 JP JP2024542815A patent/JPWO2024043216A1/ja active Pending
  • 2023-08-21 WO PCT/JP2023/030060 patent/WO2024043216A1/ja not_active Ceased
  • 2023-08-21 DE DE112023000962.7T patent/DE112023000962T5/de active Pending
  • 2023-08-21 CN CN202380032480.7A patent/CN118973742A/zh active Pending
  • 2023-08-21 US US18/853,790 patent/US20250222514A1/en active Pending

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