JP2833196B2 - Automatic mold changer for sand molding line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a mold used in a sand molding line molding machine and a carrier plate which is combined with the mold and used for transport and fixing. It relates to a device that is automatically replaced.

(Prior Art) In general, a sand molding line is composed of two conveyor lines that respectively carry an upper mold frame and a lower mold frame, and two molding machines that are respectively arranged in the middle of the conveyor lines. An upper and lower mold matching machine arranged at the confluence of the conveyor line, and a member with uneven shape corresponding to the shape of the cast product by two molding machines on the formwork conveyed by these two conveyor lines. A sand mold is formed by filling the mold sand while applying a pattern plate as a mold having a mold to form an upper mold and a lower mold, and overlaying the upper mold and the lower mold with a vertical molder at the confluence of the conveyor line. I do.

By the way, in a sand molding line, usually, in order to mold a plurality of types of sand molds at low cost and thus to cast a plurality of types of products at a low cost, a plurality of types of pattern plates, a transfer of the pattern plates by a conveyor and fixing by a molding machine. Prepare a common carrier plate with a shape suitable for, and connect the required one of the plural types of pattern plates to the carrier plate, and use the pattern plate combined with the carrier plate in a molding machine, When changing the type of sand mold to be molded, take out the pattern plate used in the molding machine together with the carrier plate, replace the pattern plate to be combined with the carrier plate with the next type to be used, and then Supply the next type of pattern plate combined with the original carrier plate to the molding machine To have.

(Problems to be solved by the invention) However, when replacing the pattern plate,
Conventionally, as shown in FIG. 12, a pattern plate 1 and a carrier plate 2 connected thereto are taken out from a molding machine (not shown), and fixing bolts 3 connecting them are removed, and the pattern plate 1 is It is lifted off the carrier plate 2 by a crane 4, transferred onto a pallet 5, transported with the forklift 6 together with the pallet 5, and stored in a pattern plate storage shelf 7, while the next type of pattern plate 1 is used.
Is taken out of the pattern plate storage shelf 7 and placed on the carrier plate 2 by a procedure reverse to that described above, and connected to the carrier plate 2 by tightening bolts 3.

For this reason, conventionally, every time the pattern plate 1 is replaced, it is necessary to attach and detach the bolts 3 and slewing work, which consumes a lot of man-hours and work time. Was a major obstacle when trying to do so.

SUMMARY OF THE INVENTION The present invention provides an automatic die changing apparatus that advantageously solves the above problems.

(Means for Solving the Problems) The automatic mold exchanging device for a sand molding line of the present invention uses a mold used in a molding machine for a sand molding line for transporting and fixing the combined mold with the mold. A device for automatically changing a carrier plate to be used, comprising a lock release pin and a engaging claw, each of which is movably supported, and connecting them, and when the lock release pin is pushed up from below, the engaging claw is moved to the mold. A mold coupling means provided on the carrier plate for moving the engaging claw to a position engaging with the mold while the lock releasing pin is released from being pushed up, and In a state where the mold is located above the carrier plate, the lifting member is raised and lowered at a position where the pushing member engages with the mold without interfering with the carrier plate. Lifting the mold from above the carrier plate to a height at which a fork can be inserted between them, placing the mold on the carrier plate by descending the mold, and releasing the lock release member from the lock. The carrier plate is moved up and down at a position where the carrier plate is engaged with the pin, and the ascending claw is moved to a position where the engaging claw is disengaged from the mold. Performing the desorption of the mold with respect to, the mold desorption means installed outside the molding machine,
Mold storage means for storing a plurality of types of the molds, and the molds picked up from the push-up member by the forks inserted between the molds lifted from above the carrier plate by the push-up member. Mold transport means for storing the mold in the storage means and then taking out the mold coupled to the carrier plate from the mold storage means and mounting the mold on the push-up member with the fork; The push-up member of the mold attaching / detaching means,
And two sets of positioning fitting portions alternately fitted to the positioning fitting portions of the fork of the mold transporting means and the mold storing means. .

(Operation) In such an apparatus, when the mold to be replaced is taken out of the molding machine in a state of being coupled to the carrier plate and supplied to the mold attaching / detaching means installed outside the molding machine, the mold is replaced. The attaching / detaching means raises the push-up member at a position where it engages with the mold without interfering with the carrier plate, and raises the unlocking member at a position where it engages with the unlocking pin. By moving the engaging claw to the position where it is released from the mold by releasing the mold from the carrier plate, and then pushing up only the mold with the push-up member to lift the mold from above the carrier plate. Lift the fork between these molds and the carrier plate to the height where it can be inserted,
Then, the mold conveying means picks up the mold lifted from above the carrier plate by the push-up member from above the push-up member with a fork inserted therebetween, and stores it in the mold storage means for storing a plurality of types of molds. In this case, only two sets of positioning fitting portions are arranged in the limited space of the mold, and the positioning member for pushing up the mold attaching / detaching means, the fork of the mold transporting means, and the mold storing means. The molds are alternately fitted into the fitting portions to ensure that the mold is transported and stored in a predetermined position.

On the other hand, when the mold transfer means takes out the mold to be subsequently coupled to the carrier plate from the mold storage means and places it on the push-up member with a fork, the mold detaching means moves the push-up member And the unlocking member are lowered, and the mold is placed on the carrier plate.
By releasing the push-up of the unlocking pin by the unlocking member, the engaging claw is moved to a position where it engages with the mold, and the mold is coupled to the carrier plate, and is carried into the molding machine using the carrier plate and Enables fixing inside the molding machine. And also in that case, the positioning fitting portion arranged only in two sets in the limited space of the mold,
If the push-up member of the mold attaching / detaching means, the fork of the mold transfer means and the mold storage means are alternately fitted to the respective positioning fitting portions, and the transfer of the mold and the placement on the push-up member are ensured. Close.

Therefore, according to the apparatus of the present invention, the mold exchanging operation for the carrier plate can be performed automatically and reliably, including the transfer and storage of the mold, and as a result, when exchanging the mold for the carrier plate. Bolt attachment and detachment and sling work can be made unnecessary, reducing many man-hours and work time,
Multi-product small-lot production of cast products can be facilitated.

Embodiment An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of an automatic mold exchanging apparatus for a sand molding line according to the present invention. In FIG. 1, reference numeral 11 denotes a pattern as a mold having a member having an uneven shape corresponding to the shape of a cast product. Plate 12 indicates a common carrier plate having a shape suitable for conveying the pattern plate 11 by a conveyor and fixing the pattern plate 11 by a molding machine.

The sand molding line here is a conveyor line 13 that conveys the upper formwork to the right in the figure, a conveyor line 14 that conveys the lower formwork to the right in the figure, and the two conveyor lines 13 and 14 The upper and lower molds are provided with two molding machines 15 for filling the mold sand while applying the pattern plate 11 positioned and fixed with the carrier plate 12 to form upper and lower molds, and a conveyor line for them. At the junction of the downstream of 13,14, an up-and-down type aligning machine (not shown) is provided.

Thus, the automatic die changing apparatus of this embodiment includes a conveyor line 16 for conveying a carrier plate 12 coupled to a pattern plate 11, a pattern plate attaching / detaching mechanism 17 as a mold attaching / detaching means, and a normal fork as a mold carrying means. An elevator 18 with a stacker and a stacker crane 19, and a normal pattern plate storage shelf 20 as a mold storage means are provided.

To increase space efficiency, the conveyor line
13, 14, 16, molding machine 15 and pattern plate detachment mechanism 17
Is installed on the second floor, the stacker crane 19 and the pattern plate storage shelf 20 are installed on the first floor, and the elevator 18 with a fork is moved to the second floor 34 as shown in FIG.
To connect the first and second floors.

Here, the pattern plate 11 has a plurality of types for the upper die and the lower die respectively corresponding to the shapes of the plurality of types of cast products, but the carrier plate 12 has
There is only one type in common, here, pattern plates for upper and lower molds according to each type of cast product
11 are combined with the carrier plate 12 to form a set, and are paired for the upper die and the lower die, and are flowed in pairs on the conveyor line 16.

Then, the conveyor line 16 here pairs the pattern plate 11 and the carrier plate 12 in the direction of the arrow for each pair, a molding machine delivery station a ₁ , b ₁ , a carrier plate detachment standby station a ₂ , b ₂ , The carrier plates are sequentially transported to the carrier plate attaching / detaching stations a ₃ and b ₃ , the coupling condition checking stations a ₄ and b ₄ , the mark exchange stations a ₅ and b ₅ , the preparation stations a ₆ and b _6, and the standby stations a ₇ and b _7. Then, each pair of the pattern plate 11 and the carrier plate 12 is sequentially placed on two molding machines 15 so that sand molds for the upper mold and the lower mold corresponding to the shapes of a plurality of types of cast products can be formed. To supply.

In the mark exchange stations a ₅ and b ₅ , the marks attached to the side surfaces of the carrier plate 12 are exchanged with those according to the type of the pattern plate 11 coupled to the carrier plate 12, and the molding machine 15 By detecting the mark, it is possible to determine which type of pattern plate 11 is being used.

If a defect is found in the connection between the pattern plate 11 and the carrier plate 12 at the connection condition checking stations a ₄ and b ₄ , those sets are transferred from the preparation stations a ₆ and b ₆ to the carrier plate through the forwarding line 16 a. It is forwarded to the desorption stations a ₃ and b ₃ .

Further, here, another plurality of pattern plates 11 for the upper mold and the lower mold are stored in the pattern plate storage shelf 20 independently without being coupled to the carrier plate 12.

Further, as shown in FIG. 2, the carrier plate 12 in this embodiment has a rectangular frame shape having a large number of reinforcing ribs inside, and the inside thereof has a pattern plate connecting means as a mold connecting means. A mechanism 21 is provided.

As shown in FIGS. 2 and 3, the pattern plate coupling mechanism 21 is disposed so as to be parallel to each other and horizontally penetrate the carrier plate 12 at both ends, and both ends are rotatably movable with respect to the carrier plate 12. Two support shafts 22 pivotally supported by the two shafts, two unlocking arms 23 respectively fixed at the center of the support shafts 22, and four lock arms 23 respectively fixed to both ends of the support shafts 22 Disc-shaped rotating member 24
And the stopper bolt of the unlocking arm 23 shown in FIG.
25, and four springs 26 for respectively urging the respective rotation members 24 toward the original position shown in FIG. 3 specified by the contact between the projections of the carrier plate 12. Here, a roller-shaped unlocking pin 27 is pivotally supported at the tip of each unlocking arm 23, while each rotating member 24 is
An arc-shaped engaging claw 28 is formed integrally with the rotating member 24 so as to protrude laterally along the outer peripheral surface on the side surface of the rotating member 24.

Further, as shown in FIGS. 3 and 4, four recesses 11a are formed in the bottom of the pattern plate 11 to receive the respective rotating members 24, and the engaging claws are respectively formed in the recesses 11a. Engagement member 29 having a projection engageable with 28
Has been fixed.

In such a pattern plate coupling mechanism 21, the fifth
As shown by phantom lines in the figure, when each unlocking pin 27 is pushed up from below by the lifting of two unlocking rods 30 as unlocking members to be described later, each support shaft is released via each unlocking arm 23. When the rotation of the rotation plate 22 causes each of the rotation members 24 to extend the respective springs 26, the respective engagement claws 28 projecting to the side thereof are rotated to a position where they are separated from the respective engagement members 29, and the pattern plate 11 is rotated. When the two unlocking rods 30 are lowered to release the push-up of the unlocking pins 27, the lower unlocking arm 23 is opened and the rotating members 24 are released. By being urged in the opposite direction by the spring 26, each of the support shafts 22 is also rotated in the opposite direction, whereby each of the rotating members 24 is engaged with each of the engaging claws 28 projecting to the side thereof. 29 and And rotated to the original position of engagement, couples a pattern plate 11 to the carrier plate 12.

In addition, at the upper part of the pattern plate 11, two locating pins 31 which are fitted into the locating holes of the mold when positioning the mold with respect to the pattern are positioned with respect to the pattern plate 11. , And on the upper surface of the carrier plate 12,
Two locating pins 32 which are fitted into two locating holes 11b formed on the lower surface of the pattern plate 11 and position the pattern plate 11 with respect to the carrier plate 12 are protruded.

In addition, on the lower surface of the pattern plate 11, as shown in FIGS. 7 and 8, at four positions close to the four corners, cutting tips which are fitted with tips of four push-up rods 33 as push-up members described later. Positioning recesses 11c are formed in a conical shape, and the carrier plate 12 has four positions aligned below the positioning recesses 11c, respectively.
A guide hole 12a through which the four push-up rods 33 are slidably inserted to guide the lifting and lowering of the push-up rods 33.
Are formed.

On the other hand, the pattern plate attaching / detaching mechanism in this embodiment
17, a frame 35 whose lower part is buried in a floor 34 on the second floor as shown in FIGS. 6 and 7, four guide rods 36 each of which can be raised and lowered, and One lifting hydraulic cylinder 37 fixed upward to the frame 35 at a position surrounded by the guide rod 36,
A lifting and lowering table 38 to which the distal ends of the piston rod 37a of the hydraulic cylinder 37 and the four guide rods 36 are fixed,
As shown in FIG. 8, the two lock release rods 30 and the four push-up rods 33 are provided upright on the lift table 38, respectively.

Here, the operation of the hydraulic cylinder 37 is performed by a sequencer (not shown) connected to the respective control devices of the conveyor line 16 for transporting the carrier plate 12 coupled to the pattern plate 11, the elevator 18 with a fork, and the stacker crane 19. The conveyor line 16 is controlled to cooperate with the elevator 18 with a fork and the stacker crane 19 by appropriately operating the electromagnetic control valve connected to the conveyor line 16.

In the pattern plate attaching / detaching mechanism 17, the conveyor line 16 is positioned at a predetermined position above the pattern plate attaching / detaching mechanism 17.
When the set of the pattern plate 11 and the carrier plate 12 connected to each other as shown in FIGS.
37a, the elevator 38 is raised under the guidance of the guide rod 36, and the two unlocking rods
The pattern plate 11 is released from the carrier plate 12 by pushing up the unlocking pin 27 of the pattern plate coupling mechanism 21 at 30, and then four push-up rods 33 are passed through the guide holes 12a of the carrier plate 12 to The tip portion is fitted into the positioning recess 11c on the lower surface of the pattern plate 11 and then further raised to push up only the pattern plate, thereby displacing the pattern plate 11 from the carrier plate 12 as shown in FIG. Remove and lift.

When the pattern plate 11 is removed as described above, here, the elevator 39 with the fork with an elevator 18 raised to the second floor inserts the fork 40 between the pattern plate 11 and the carrier plate 12. The pattern plate 11 is slightly lifted up from above, the pattern plate 11 is picked up on the fork 40, the fork 40 is retracted, the pattern plate 11 is taken in as shown by the imaginary line in FIG. 6, and then lowered to the first floor. The fork-equipped stacker crane 19 shown in FIG. 10 moves in front of the fork-equipped elevator 18 and ejects the fork 41 to remove the pattern plate 11.
Is received from the elevator 39, the pattern plate storage shelf 20 is moved in front of a predetermined shelf on which the pattern plate 11 is to be placed, and the fork 41 is taken out to remove the pattern plate.
Transfer 11 to the shelf.

Next, here, the stacker crane 19 moves the pattern plate 11 next to the carrier plate 12 of the pattern plate storage shelf 20 from which the pattern plate 11 has been removed, based on an operator's instruction to the control device. Move in front of the shelf on which it is placed, take out the fork 41, receive the pattern plate 11 on the shelf, move it in front of the elevator 18 with fork, and place the pattern plate 11 on the elevator 39 Transfer, then elevator with fork
18, the elevator 39 rises to the second floor, the fork 40 is extended above the carrier plate 12 and then slightly lowered to lower the pattern plate 11 on the four lifting rods 33,
The rods are transferred so that their tips fit into the positioning recesses 11c on the lower surface of the pattern plate 11, respectively.

Thereafter, in the pattern plate attaching / detaching mechanism 17, contrary to the above, the lifting hydraulic cylinder 37 retreats the piston rod 37a to lower the elevating table 38 under the guide of the guide rod 36. First, the pattern plate 11 to be connected next is lowered onto the carrier plate 12 by lowering the four push-up rods 33, and the locate pin 32 is fitted into the locate hole 11b,
Unlock pin by lowering two unlock rods 30
The lifting of 27 is released, so that the pattern plate 11 and the carrier plate 12 are connected to the pattern plate connecting mechanism 21 so that the conveyor line 16 can carry out the pattern plate.

In this embodiment, as shown in FIG. 11, in addition to the set of the four positioning recesses 11c, four frusto-conical positioning are provided at a common position on the lower surface of each pattern plate 11. A set of notches 11d is formed, and a fork 40 of the elevator 39 of the elevator 18 with a fork is provided with a positioning projection (not shown) that can be fitted with the positioning recess 11d, and a fork of the stacker crane 19 is provided. 40,
A positioning projection (not shown) that can be fitted into the positioning recess 11c is provided, and a pattern plate storage shelf is provided.
Each of the shelves 20 is provided with a positioning projection (not shown) that can be fitted into the positioning recess 11d. The elevator with fork 18, the stacker crane 19, and the pattern plate storage shelf 20 are provided with the positioning projections. By alternately fitting the parts into the two sets of positioning recesses 11c and 11d, the pattern plate 11 is automatically transported and stored while being accurately positioned.

Therefore, according to the automatic exchanging apparatus of this embodiment, the exchanging work of the pattern plate 11 can be performed automatically, which can eliminate the need for attaching and detaching bolts and slinging work at the time of exchanging the pattern plate. And the work time can be reduced, and the production of many kinds and small quantities of cast products can be facilitated.

Further, according to this embodiment, the elevator with fork 18, the stacker crane 19, and the pattern plate storage shelf 20 automatically and reliably transfer and store the pattern plate 11, so that the number of man-hours and work time for pattern plate replacement are Can be further reduced than the case without them, and since there are only two sets of concave portions provided on the lower surface of the pattern plate 11 for their positioning,
There is no need to provide many positioning fitting portions in a limited range on the lower surface of the pattern plate 11, and the fitting portions can be provided easily.

As described above, the present invention has been described based on the illustrated examples. However, the present invention is not limited to the above-described example. For example, in the above-described example, although a series of operations is performed by the control of the control device and the sequencer, The operator instructs the pattern plate to be performed, but the instruction may be made to the production management computer based on a previously input production plan. Automation can also be achieved.

(Effects of the Invention) Thus, according to the automatic mold exchanging apparatus for the sand molding line of the present invention, the mold exchanging operation for the carrier plate can be performed automatically and reliably including the transport and storage of the mold. In addition, it is possible to eliminate the need for attaching and detaching bolts and slinging operations when replacing the mold on the carrier plate, thereby reducing the number of man-hours and working time, and facilitating the production of a large variety of small-sized cast products.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of an automatic mold exchanging apparatus for a sand molding line according to the present invention, FIG. 2 is a plan view showing a carrier plate in the above embodiment, and FIGS. FIG. 5 is a front view and a side view showing the carrier plate in the example in a partially cut-out state in connection with the pattern plate. FIG. 5 shows the carrier plate in the above embodiment in a state in connection with the pattern plate. FIG. 6 is a sectional view taken along the line II. FIG. 6 is a front view showing the pattern plate attaching / detaching mechanism and the elevator with a fork in the above embodiment. FIGS. 7 and 8 show the pattern plate attaching / detaching mechanism in the above embodiment different from FIG. FIG. 9 and FIG. 10 are front and side views showing the stacker crane in the above embodiment in an enlarged manner in an operating state, FIG. 9 and FIG. Bottom view showing a pattern plate in the above embodiment, FIG. 12 is an explanatory view showing a conventional pattern plate replacement. 11… Pattern plates 11c, 11d… Positioning recess 12… Carrier plate 15… Molding machine 17… Pattern plate attaching / detaching mechanism 18… Elevator with fork 19 …… Stacker crane 20 …… Pattern plate storage shelf 21… … Pattern plate coupling mechanism 27… Lock release pin, 28… Hook claw 30… Lock release rod, 33… Push-up rod

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroaki Ogasawara 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture Nissan Motor Co., Ltd. (56) References JP-B-62-55466 (JP, B2) JIN-SHO 58- 36433 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B22C 23/00

Claims (1)

(57) [Claims] 1. An apparatus for automatically exchanging a mold (11) used in a sand molding machine with a carrier plate (12) which is combined with the mold and used for transport and fixing. , Each of which has a movable release lock pin (27) and a hook (2
8) and connecting them, and when the lock release pin is pushed up from below, the engaging pawl is moved to a position where it is released from the mold, and when the push up of the lock release pin is released, A mold coupling means (21) provided on the carrier plate for moving the engaging claw to a position engaging with the mold; and a lifting member (33) in a state where the mold is located above the carrier plate. Is lifted and lowered at a position where it engages with the mold without interfering with the carrier plate, and the rise raises the mold from above the carrier plate to a height at which a fork (40) can be inserted therebetween. By this lowering, the mold is placed on the carrier plate, and the unlocking member (30) is raised and lowered at a position where it engages with the unlocking pin. By moving the engaging claw to a position where the engaging claw is detached from the mold by moving up, and moving the engaging claw to a position where the engaging claw is engaged with the mold by lowering the engaging claw, the mold is detached from the carrier plate. Mold detaching means (17) installed outside the molding machine, mold storing means (20) for storing a plurality of types of the molds, and the mold lifted from above the carrier plate by the push-up member Is lifted up from the push-up member with the fork inserted between them and stored in the mold storing means, and then the mold coupled to the carrier plate is taken out of the mold storing means and the fork is removed. The mold transfer means (1
8,19), which are arranged in the mold and are alternately fitted to the positioning fitting portions of the push-up member of the mold attaching / detaching means, the fork of the mold transporting means, and the mold storing means. An automatic die changing device for a sand molding line, comprising: two sets of positioning fitting portions (11c, 11d).