JP2011161497A - Molten metal feeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molten metal feeding device in which the tilting angle of a ladle can be freely set. <P>SOLUTION: In the molten metal feeding device including a link mechanism 2 for ladle carrying and a ladle rotating mechanism 3, the ladle rotating mechanism 3 is provided with a parallel link mechanism 20 driven by a motor 6 for ladle rotation. The parallel link mechanism 20 is composed of: a first crankshaft 21 rotated by the motor 6 for ladle rotation; a second crankshaft 23 rotatably fitted to the other side of a first link member 11 held around the first crankshaft 21 in such a manner that one end is rotatable; and two bar-shaped link members 24A, 24B in which both the edges of eccentric shafts 45, 46 with different two rotational phases formed at the first and second crankshafts 21, 23. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a molten metal supply device used for a cold chamber type die casting machine, and in particular, a rotation of a ladle that pumps the molten metal from a melting furnace and pours the pumped molten metal into an injection sleeve provided in the die casting machine. Regarding the mechanism.

  In a molten metal supply device that pumps a predetermined amount of molten metal from the melting furnace with a ladle, conveys the ladle to above the hot water inlet of the injection sleeve, and pours the molten metal in the ladle into the injection sleeve from the hot water inlet, The ladle is transported from the melting furnace to the upper side of the hot water supply port by the link mechanism, and the ladle is rotated (tilted) so that the molten metal in the ladle is supplied to the hot water supply port by the ladle rotation mechanism. Many.

  As shown in FIG. 9, the applicant of the present application previously described a ladle transport link mechanism 106 including first to fifth link members 101, 102, 103, 104, and 105, as shown in FIG. The belt rotation transmission system 117 held in the first link 101 constituting the ladle conveyance link mechanism 106 and the belt rotation transmission system 117 held in the second link 102 constituting the ladle conveyance link mechanism 106. A mechanism having a ladle rotation transmission mechanism including a parallel link rotation transmission system 118 connected to the output side has been proposed. The parallel link rotation transmission system 118 includes first and second rotating bodies 119 and 120 rotatably held at one end and the other end of the second link 102, and the first and second rotating bodies 119, A pair of bar-shaped links 121 and 122 whose both ends are rotatably connected to 120, and a ladle 123 is integrally attached to the second rotating body 120. Reference numeral 131 in the figure denotes a ladle transport motor for driving the ladle transport link mechanism 106, and 132 denotes a ladle for driving the ladle rotation transmission mechanism (the belt rotation transmission system 117 and the parallel link rotation transmission system 118). A rotation motor, 133 indicates an output shaft of the ladle conveyance motor 131, and 134 indicates an output shaft of the ladle rotation motor 132.

  Since the parallel link rotation transmission system 118 is made of steel, the parallel link rotation transmission system 118 is excellent in heat resistance and durability and has the same linear expansion coefficient as that of the link member constituting the ladle transport link mechanism 106. In the state (when the apparatus is stopped) and in the high temperature state (when the apparatus is in operation), the parallel link rotation transmission system 118 and the link member are in the same extended state and contracted state, and the operation function is stable. . Therefore, in the metal melt supply device of this configuration, the entire rotation transmission mechanism for rotating the ladle is excellent in rotation transmission accuracy, and the rotation posture control (tilt angle control) of the ladle 123 can be precisely performed.

JP 2008-110372 A

  However, since the molten metal supply apparatus described in Patent Document 1 cannot rotate the first and second rotating bodies 119 and 120 at an arbitrary rotation angle, the tilt angle of the ladle 123 is set to the viscosity of the molten metal. There is a problem that it cannot be arbitrarily set according to the above.

  That is, as shown in FIG. 10, in the molten metal supply apparatus described in Patent Document 1, the first rotating body 119 constituting the parallel link rotation transmission system 118 is attached to the outer periphery of the first support shaft 141 at a constant pitch. The first to third rotating disks 142, 143, 144, the first eccentric shaft 145 bridged between the first rotating disk 142 and the second rotating disk 143, and the second rotating disk 143 And a second eccentric shaft 146 bridged between the third rotating disk 144 and one end of the pair of bar-shaped links 121 and 122 are respectively connected to the first eccentric shaft 145 and the second eccentric shaft. 146. Therefore, when the first support shaft 141 is rotated leftward (in the direction of the arrow A) by a predetermined rotation angle, one bar-shaped link 121 collides with the first support shaft 141 as shown by a solid line in FIG. When the first support shaft 141 is rotated rightward (in the direction of arrow B) by a predetermined rotation angle, the other bar-shaped link 122 collides with the first support shaft 141 as shown by a chain line in FIG. Match. Therefore, it is impossible to rotate the first support shaft 141 beyond the rotation angle at which the bar-shaped links 121 and 122 meet, and the tilt angle of the ladle 123 is limited. For example, a high-viscosity molten metal can be produced at a high speed. Inconveniences such as being unable to pour into the injection sleeve are likely to occur. Although not shown, the second rotating body 120 is also configured in the same manner as the first rotating body 119, and when the second support shaft 142 is rotated, the bar-shaped links 121 and 122 are connected to the second supporting body 142. Abuts on shaft 142.

  This invention is made | formed in view of such a point, The place made into the objective is to provide the molten metal supply apparatus which can set the inclination angle of a ladle freely.

  In order to achieve the above object, the present invention provides a ladle that pumps a predetermined amount of molten metal from a melting furnace, and a ladle that is alternately positioned at a predetermined position on the melting furnace side and a predetermined position on an injection sleeve side provided in a die casting machine. A ladle transport link mechanism for transporting, a ladle transport motor as a power source of the ladle transport link mechanism, and when the ladle is transported to a predetermined position on the injection sleeve side, the ladle is rotated, In the molten metal supply apparatus comprising a ladle rotating mechanism that pours the molten metal pumped into the ladle into the injection sleeve, and a ladle rotating motor that is a power source of the ladle rotating mechanism, the ladle rotating mechanism includes: A parallel link mechanism driven by the ladle rotation motor; and the parallel link mechanism is driven by the ladle rotation motor. A first crankshaft to be rotated, a second crankshaft rotatably attached to the other end of a link member having one end rotatably held around the first crankshaft, and the first and second And two bar-shaped link members having both ends connected to eccentric shafts having different rotational phases respectively formed on the crankshaft.

  The crankshaft has a rotation center shaft formed at least at both ends in the length direction, and a rotation disk and an eccentric shaft are alternately formed between the rotation shafts. A rotation center shaft is formed at a portion where the eccentric shaft is formed. The shaft has a bent structure that is not. Therefore, when both ends of the bar-shaped link member are rotatably connected to the eccentric shaft of the crankshaft, the crankshaft and the bar-shaped link member do not collide with each other regardless of the rotation angle of the crankshaft. As a result, the tilt angle of the ladle can be arbitrarily set, and the tilt angle of the ladle can be set according to the viscosity of the molten metal.

  In the present invention, the rotational phase difference between the two eccentric shafts formed on the first and second crankshafts is 90 °.

  According to such a configuration, the rotational phase difference between the pair of bar-shaped links can be set to 90 °, so that no dead point occurs in the operation process of these two bar-shaped links, and the parallel link mechanism operates smoothly. Thus, it can be made highly reliable.

  According to the present invention, in the configuration described above, the link member whose one end is rotatably held around the first crankshaft is one of a plurality of link members configuring the ladle transport link mechanism. did.

  According to such a configuration, since the parallel link mechanism can be attached to one of the plurality of link members constituting the ladle transport link mechanism, there is no need to provide a special link member for attaching the parallel link mechanism, and the molten metal The configuration of the supply device can be simplified.

  According to the present invention, in the configuration described above, the second crankshaft is connected to one end of a chain drive mechanism in which the ladle is attached to the other end.

  According to such a configuration, the rotation of the first crankshaft can be transmitted to the ladle via the pair of bar-shaped links, the second crankshaft, and the chain drive mechanism, and thus has two link members connected in series. Application to a ladle transport link mechanism is possible, and transport of the ladle can be facilitated.

  According to the present invention, the parallel link mechanism provided in the ladle rotation mechanism includes a first crankshaft rotated by a ladle rotation motor, and a link member whose one end is rotatably held around the first crankshaft. A second crankshaft rotatably attached to the end side, and two bar-shaped link members having both ends connected to two eccentric shafts formed on the first and second crankshafts and having different rotational phases Therefore, the collision between the crankshaft and the bar-shaped link member can be avoided regardless of the rotation angle of the crankshaft. Therefore, the tilt angle of the ladle can be arbitrarily set, and the tilt angle of the ladle can be set according to the viscosity of the molten metal.

It is a perspective view of the molten metal supply apparatus which concerns on embodiment. It is a principal part expansion perspective view of the molten metal supply apparatus which concerns on embodiment. It is a perspective view of the ladle rotation mechanism concerning an embodiment. It is a perspective view of the parallel link mechanism concerning an embodiment. It is a front view of the molten metal supply apparatus which concerns on embodiment which abbreviate | omitted partially showing the state in which the ladle was inserted in the melting furnace. It is a front view of the molten metal supply apparatus which concerns on embodiment which abbreviate | omitted partially showing the state where the ladle was pulled up from the melting furnace. It is a front view of the molten metal supply apparatus which concerns on embodiment which abbreviate | omitted partially showing the state by which the ladle was conveyed to the predetermined position above an injection sleeve. It is a front view of the molten metal supply apparatus which concerns on embodiment which abbreviate | omitted one part which shows the state at the time of rotating a ladle and pouring a molten metal in an injection sleeve. It is a block diagram of the molten metal supply apparatus which concerns on a prior art example. It is a principal part perspective view which shows the structure of the parallel link rotation transmission system with which the molten metal supply apparatus which concerns on a prior art example is equipped. It is a principal part front view which shows the problem of the parallel link rotation transmission system with which the molten metal supply apparatus which concerns on a prior art example is equipped.

  Hereinafter, an embodiment of a molten metal supply apparatus according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1 and FIG. 2, the molten metal supply apparatus of this example is a ladle transport link comprising a support frame 1 installed at a site where a die casting machine is installed, and a five-bar link mechanism provided on the support frame 1. The mechanism 2, the ladle rotating mechanism 3 incorporated in the ladle transport link mechanism 2, and the ladle transport link mechanism 2 are alternately switched to a predetermined position on the melting furnace side and a predetermined position on the injection sleeve side provided in the die casting machine. The ladle 4 that is conveyed and rotated by the ladle rotation mechanism 3, the ladle conveyance motor 5 that is mounted on the support frame 1 to drive the ladle conveyance link mechanism 2, and the ladle 4 is rotated (tilted). ) Is mainly composed of a ladle rotation motor 6 mounted on the support frame 1. In the support frame 1, a first reduction gear mechanism (not shown) that decelerates the rotation of the ladle conveyance motor 5 and outputs it to the output shaft 7 for ladle conveyance, and the rotation of the ladle rotation motor 6 is decelerated. A second reduction gear mechanism (not shown) for outputting to the rotation output shaft 8 is provided, and the ladle transport output shaft 7 and the ladle rotation output shaft 8 are projected in parallel from the same side surface of the support frame 1. ing.

  The ladle transporting link mechanism 2 includes a first link member 11 having one end rotatably supported by the output shaft 7 for ladle rotation, and a second link rotatably connected to the other end of the first link member 11. The member 12, the third link member 13 with one end fixed to the output shaft 7 for ladle conveyance, and the one end are rotatably connected to the intermediate portion of the second link member 12, and the third link member 13 is connected to the intermediate portion. The other end portion of the fourth link member 14 is rotatably connected, the one end portion is rotatably held by the ladle rotation output shaft 8, and the other end portion is rotatable with the other end portion of the fourth link member 14. The base end of the ladle 4 is rotatably held at the other end of the second link 12. In addition, the 1st thru | or 5th link members 11-15 are formed in the hollow box shape with the steel plate, and each connection part of each link member is connected rotatably via a required spindle. .

  The ladle transport link mechanism 2 of this example configured as described above rotates and drives the third link member 13, which is the prime mover, by the driving force of the ladle transport motor 5, and the other four link members 11, 12. , 14 and 15 are moved together to move the base end portion (rotation center of the ladle 4) of the ladle 4 along a predetermined movement locus, as shown in FIGS. The transport operation of the ladle 4 will be described later.

  As shown in FIG. 3, the ladle rotation mechanism 3 includes a parallel link mechanism 20 built in the first link member 11 and a chain drive mechanism 30 built in the second link member 12. Among these, the parallel link mechanism 20 is a first support shaft that rotatably connects the first crankshaft 21 having one end fixed to the output shaft 8 for ladle rotation, and the first link member 11 and the second link member 12. 22, a second crankshaft 23 having one end fixed to the first support shaft 22, and a pair of bar-shaped links 24 </ b> A and 24 </ b> B having both ends connected to the first and second crankshafts 21 and 23. Consists of. On the other hand, the chain drive mechanism 30 includes a first sprocket 31 fixed to the first support shaft 22 concentrically with the second crankshaft 23, a second support shaft 32 connecting the second link member 12 and the ladle 4, and A second sprocket 33 fixed to the second support shaft 32 and a chain 34 wound around the first and second sprockets 31 and 33 are formed. The ladle 4 is attached integrally.

  As shown in FIG. 4, the first and second crankshafts 21 and 23 are the same, and the first and second crankshafts 21 have the insertion holes 41 of the output shaft 8 for ladle rotation or the first support shaft 22. A first web 42 and a third web 44 arranged in parallel with each other at a predetermined interval in which bar-like links 24A and 24B can be inserted between the first web 42 and the second web 43; The first eccentric shaft 45 is bridged between the web 42 and the third web 44, and the second eccentric shaft 46 is bridged between the third web 44 and the second web 43. Thus, if the same thing is used as the 1st and 2nd crankshafts 21 and 23, since parts can be shared, manufacture and management of parts, and assembly of a molten metal supply device can be facilitated. Moreover, cost reduction of the molten metal supply device can be achieved.

  The rotational phase difference between the first eccentric shaft 45 and the second eccentric shaft 46 with respect to the insertion hole 41 is set to 90 ° so as not to cause a dead point in the operation process of the bar-shaped links 24A and 24B. Thereby, the operation | movement of the parallel link mechanism 20 can be made smooth, and the operation | movement reliability of a molten metal supply apparatus can be improved.

  The first and second webs 42 and 43 also serve as clampers for fixing the first and second crankshafts 21 and 23 to the ladle rotation output shaft 8 or the first support shaft 22. A slit 47 reaching the outer surface of the first and second webs 42 and 43 is formed from a part of the first and second webs 42 and 43, and tightening for opening and closing the slit 47 is performed on the outer surfaces of the first and second webs 42 and 43. Bolts 48 are screwed together. Therefore, the first and second crankshafts 21 and 23 are inserted into the insertion holes 41 formed in the first or second webs 42 and 43 after the ladle rotation output shaft 8 or the first support shaft 22 is inserted. By tightening the tightening bolt 48, it can be fixed to the output shaft 8 for ladle rotation or the first support shaft 22.

  Since the ladle rotating mechanism 3 of this example is configured as described above, when the ladle rotating motor 6 is rotationally driven, the rotation is transmitted to the ladle rotating output shaft 8 via a second reduction gear mechanism (not shown). Then, the first crankshaft 21 fixed to the output shaft 8 is rotationally driven. The rotation of the first crankshaft 21 is transmitted to the second crankshaft 23 through a pair of bar-like links 24A and 24B rotatably connected to the first eccentric shaft 45 and the second eccentric shaft 46, and the second crankshaft The shaft 23, the first support shaft 22 fixed to the second crankshaft 23, and the first sprocket 31 fixed to the first support shaft 22 are integrally rotated. The rotation of the first sprocket 31 is transmitted to the second sprocket 33 via the chain 34, and the second sprocket 33, the second support shaft 32 to which the second sprocket 33 is fixed, and one end of the second support shaft 32. And the ladle 4 fixed to are integrally rotated.

  As described above, the first and second crankshafts 21, 23 have the ladle rotation output shaft 8 or the first support shaft 22 in the insertion hole 41 formed in the first or second web 42, 43. Since it is fixed to the output shaft 8 for ladle rotation or the first support shaft 22 in the inserted state, it is between the first web 42 and the third web 44 and between the third web 44 and the second web 43. The output shaft 8 for ladle rotation or the first support shaft 22 is not arranged. Therefore, regardless of the angular range of the first and second crankshafts 21 and 23, the ladle rotation output shaft 8 or the first support shaft 22 abuts the bar-shaped links 24A and 24B. In addition, the ladle 4 can be tilted at an arbitrary angle, and a high-viscosity molten metal can be quickly supplied into the injection sleeve.

  Hereinafter, the operation of the molten metal supply apparatus executed by cooperatively driving the ladle transport link mechanism 2 and the ladle rotation mechanism 3 will be described with reference to FIGS. In each of these drawings, the first link member 11 constituting the ladle transport link mechanism 2 is omitted.

  FIG. 5 is a view showing a state in which the ladle 4 is inserted into the melting furnace, and the ladle 4 is inserted into the melting furnace with the molten metal inlet 4a lowered from the horizontal position. After pouring the molten metal into the ladle 4, if the ladle 4 is pulled upward from the melting furnace while keeping the inclination angle of the molten metal inlet 4a, the inclination angle α of the molten metal inlet 4a is maintained. A certain amount of molten metal corresponding to the temperature can be pumped into the ladle 4. Of course, the amount of the molten metal pumped into the ladle 4 can be increased or decreased by changing the inclination angle α of the molten metal inlet 4a.

  After the ladle 4 is pulled up above the melting furnace, the ladle rotating motor 6 is driven to bring the molten metal inlet 4a of the ladle 4 into a horizontal state as shown in FIG. Thereby, it can prevent that the molten metal in the ladle 4 spills out during conveyance.

  From this state, the ladle transport motor 5 is driven, and as shown in FIG. 7, the ladle 4 is moved to a predetermined position above the injection sleeve (not shown), more specifically, above the hot water supply opening provided in the injection sleeve. Transport. In this transport process, the ladle rotating motor 6 is cooperatively driven so that the molten metal inlet 4a of the ladle 4 is always kept horizontal.

  At the stage where the ladle 4 reaches a predetermined position above the hot water outlet provided in the injection sleeve, the driving of the ladle transport motor 5 is stopped. Further, the ladle rotating motor 6 is driven to rotate the ladle 4 so that the molten metal discharge port 4b faces downward as shown in FIG. Thereby, the molten metal in the ladle 4 can be poured into the hot water supply port of the injection sleeve. The injection speed of the molten metal into the hot water inlet can be adjusted by changing the rotation angle β of the ladle 4. For the high-viscosity metal melt, the rotation angle β of the ladle 4 is increased, and for the low-viscosity metal melt, the ladle. By reducing the rotation angle β of 4, the injection speed of the molten metal into the hot water supply port can be made constant. Since the molten metal supply device of this example rotatably connects the bar-shaped links 24A and 24B to the first and second eccentric shafts 45 and 46 formed on the first and second crankshafts 21 and 23, The ladle rotation output shaft 8 or the first support shaft 22 does not collide with the bar-shaped links 24A and 24B regardless of the angular range of the first and second crankshafts 21 and 23. 4 can be tilted at any angle.

  In addition, in the said embodiment, although the link mechanism 2 for ladle conveyance was comprised with the 5-joint link mechanism, the summary of this invention is not limited to this, It is also possible to utilize other arbitrary link mechanisms. It is.

  INDUSTRIAL APPLICABILITY The present invention can be used for a molten metal supply device used in a cold chamber type die casting machine.

DESCRIPTION OF SYMBOLS 1 Support frame 2 Raddle conveyance link mechanism 3 Raddle rotation mechanism 4 Raddle 5 Raddle conveyance motor 6 Raddle rotation motor 7 Raddle conveyance output shaft 8 Raddle rotation output shaft 11 First link member 12 Second link member 13 3rd Link member 14 Fourth link member 15 Fifth link member 20 Parallel link mechanism 21 First crankshaft 22 First support shaft 23 Second crankshaft 24A, 24B A pair of bar-shaped links 30 Chain drive mechanism 31 First sprocket 32 Second Support shaft 33 Second sprocket 34 Chain 41 Insertion hole 42 First web 43 Second web 44 Third web 45 First eccentric shaft 46 Second eccentric shaft

Claims (4)

A ladle for pumping a predetermined amount of molten metal from the melting furnace, a ladle conveyance link mechanism for alternately conveying the ladle to a predetermined position on the melting furnace side and a predetermined position on the injection sleeve side provided in the die casting machine, and the ladle A ladle transport motor that is a power source of a transport link mechanism, and when the ladle is transported to a predetermined position on the injection sleeve side, the ladle is rotated, and the molten metal pumped into the ladle is In a molten metal supply apparatus comprising a ladle rotation mechanism that is poured into an injection sleeve, and a ladle rotation motor that is a power source of the ladle rotation mechanism,
The ladle rotation mechanism includes a parallel link mechanism driven by the ladle rotation motor, and the parallel link mechanism includes a first crankshaft rotated by the ladle rotation motor, and the first crankshaft. The second crankshaft rotatably attached to the other end of the link member whose one end is rotatably held around the two and the two rotation phases respectively formed on the first and second crankshafts are different An apparatus for supplying molten metal comprising two bar-shaped link members having both ends connected to an eccentric shaft.   2. The molten metal supply apparatus according to claim 1, wherein a rotational phase difference between two eccentric shafts formed on the first and second crankshafts is 90 °.   3. The link member having one end rotatably held around the first crankshaft is one of a plurality of link members constituting the ladle transport link mechanism. The molten metal supply device according to any one of the above.   The molten metal supply device according to any one of claims 1 to 3, wherein the second crankshaft is connected to one end of a chain drive mechanism having the other end attached to the ladle. .

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