JPS598468B2 - Hot water volume adjustment mechanism of die-casting machine water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot water amount adjustment mechanism for an automatic hot water supply device for a die casting machine.

Generally, in a cold chamber type die casting machine, molten metal is pumped up in a crucible of a melting furnace which is separately placed close to the spout of the injection cylinder of the die casting machine, using a ladle.
An automatic pouring device is used that automatically pours the metal into the pouring chamber.

Various types of automatic pouring devices have been devised, but a particularly suitable device is the “Water supply device for die-casting machines” proposed by the present applicant (Japanese Patent Publication No. 55-1
No. 8591) has come into widespread practical use.

However, conventionally proposed automatic water heaters
In either case, it is not possible to easily adjust the amount of molten metal pumped up by the ladle, and therefore the amount of molten metal poured into the ladle 10 is determined based on the volume of the product to be cast, as shown in Figure 1. Adjustments were made by adjusting the height of the notched groove 12.

For this reason, when replacing the casting mold, the amount of molten metal to be poured will also differ, so each time the mold is replaced, the ladle must be replaced with one that has the appropriate pouring capacity. The work was extremely complicated.

In addition, even after the mold into which the desired cast product is to be cast is installed in the die-casting machine, trial shots must be repeated at the start of operation in order to determine the optimum amount of poured metal. It is very dangerous to manually replace the hot ladle, and it is difficult to finely adjust the amount of poured metal.

The present invention provides, in such an automatic hot water supply device, a hot water amount adjustment mechanism in which the ladle is configured to be tiltable and fixed at a desired tilting angle, and the amount of molten metal pumped up by the ladle can be freely adjusted. It is an object of the present invention to eliminate the various drawbacks of the above-mentioned prior art at once.

Therefore, in order to further contribute to the understanding of the mechanism according to the present invention, we will explain the general structure and operation of an automatic hot water supply device for a die-casting machine that is most suitable for applying the hot water amount adjustment mechanism of the present invention.
First, we will point out the drawback that the amount of hot water cannot be adjusted in this device, and also explain the background that led to the invention of the present invention.

FIG. 2 schematically shows an automatic water heater suitable for incorporating the hot water amount adjustment mechanism according to the present invention, which is the subject of the invention of Japanese Patent Publication No. 18591/1983 proposed by the present applicant. It is something.

This water heater is a hot water pouring hopper 16 of a die casting machine 14.
It is comprised of a quadrilateral link mechanism 26 that is pivotably and deformably connected via a first rotating shaft 24 and a second rotating shaft 22 to a frame 20 that is vertically disposed in a melting furnace 18 that is separately placed in the vicinity of the melting furnace 18 .

The quadrilateral linkage 26 includes an upper arm 28, a lower arm 30, an auxiliary arm 32, and a ladle support arm 3.
One end of a drive arm 36 is fixed to the shaft 22, which is basically configured with a first hydraulic motor (not shown), and the other end is attached to the shaft 3 near the middle of the lower arm 30.
It is pivotally connected via 8.

Further, a ladle 40 for pumping up molten metal is pivotally attached to the tip of the ladle support arm 34 via a shaft 42, and a sprocket wheel 44 is further fixed to the shaft 42.

A shaft 24 connecting the auxiliary arm 32 and the upper arm 28 is connected to another second hydraulic motor (not shown), and a sprocket wheel 46 is also fixed to this shaft 24. Two sprocket wheels 48, 50 are arranged and fixed in parallel on a shaft 47 that connects the support arm 34.

The sprocket wheel 44 and the sprocket wheel 48
Chains 52 and 54 are wound between the sprocket wheel 50 and the sprocket wheel 46, respectively.

With this configuration, continuous hot water supply operation can be achieved as described below.

That is, the ladle 40, which is held horizontally and is immersed in the molten metal 58 of the crucible 56 of the melting furnace and is in position a in FIG.
The drive arm 36 rotates to deform the quadrilateral link mechanism 26, and the ladle 40 is filled with molten metal to the fullest extent.
is pulled up substantially vertically to position b, and then, while keeping the ladle 40 horizontal, it is transferred to hot water supply position g following the locus of positions C, d, e, and f.

In addition, during this process, the second hydraulic motor operates to control the rotation of the shaft 24 and keep the ladle 40 in a horizontal state at all times.

After reaching the hot water supply position g, the second hydraulic motor is driven to rotate the shaft 24 counterclockwise, and therefore the chain 54
．． 52, the sprocket wheel 44 rotates in the same direction, and as a result, the ladle 40 also tilts counterclockwise about the shaft 42, and the molten metal in the ladle 40 is injected into the hopper 16 of the die-casting machine 14. be.

Although the automatic hot water supply device described above is extremely useful because it repeatedly and continuously achieves such an automatic pouring operation, it is difficult to easily adjust the pouring amount, and it is difficult to easily adjust the pouring amount. In addition, as already mentioned as a drawback of the prior art, it significantly impairs workability at the stage of mold replacement.

Therefore, the inventor has made various prototypes to overcome the above-mentioned drawbacks, and as a result, in the automatic water heater proposed by the applicant described above, the ladle 40 at the hot water supply position g acts as a biasing force for the second hydraulic motor. When tilting downwards towards the pouring hopper 16, the sprocket wheel 46 fixed to the shaft 24 connected to the second hydraulic motor is connected to the ladle shaft 4 via the chain 54 and the sprocket wheel 48,50 and the chain 52.
2, the sprocket wheel 44 (and ladle 40) follows the rotation of the sprocket wheel 46, and the sprocket wheel 46.
We focused on the fact that the angular displacements of are exactly the same and in the same direction.

Therefore, the ladle 4 returns to the crucible 56 after finishing hot water supply.
0, if the shaft 24 is rotated by a predetermined angle, the ladle 40 will also tilt synchronously, and by adjusting this tilting angle, the amount of molten metal pumped into the ladle 40 can also be adjusted, making it possible to change molds and trial runs. It has been found that the above-mentioned drawbacks can be solved all at once by eliminating the need to frequently replace the ladle in order to find a ladle with the optimum capacity each time.

Therefore, an object of the present invention is to provide a hot water amount adjustment mechanism that can easily adjust the amount of molten metal that can be pumped up by a ladle in an automatic hot water supply device for a die-casting machine as described above.

To achieve this objective, the present invention includes a frame mounted between the die-casting machine and the crucible, and an upper arm, an auxiliary arm, a lower arm, and a ladle support that rotate around a drive shaft rotatably mounted on the frame. In a water heater for a die-casting machine equipped with a quadrilateral link mechanism formed by an arm, a pressing member is attached to a boss portion provided on a part of the drive shaft, and a frame is provided with a pressing member to set the tilting angle of the ladle with respect to the pressing member. Screw shafts configured to be movable forward and backward by being screwed onto a fixed support member are disposed facing each other, and furthermore, a limit switch is attached to the screw shaft to detect the position of the suppressing member by contacting it, and the ladle is reversed or It is characterized by being configured to adjust the rotation stop position.

Further, in the above-mentioned hot water amount adjustment mechanism, it is preferable that an actuator for automatically moving the screw shaft forward and backward is provided at one end of the screw shaft to enable automatic adjustment.

Next, the hot water amount adjusting mechanism according to the present invention will be described in detail below with reference to preferred embodiments and the accompanying drawings.

FIG. 4 is a detailed enlarged view of the quadrilateral link mechanism 26 of the automatic water heater shown in FIG.

The details are shown in FIGS. 5 to 7. That is, FIG. 5 shows the device shown in FIG. 4 observed in the direction indicated by arrow B, and the reduction gear 62 driven by the second hydraulic motor 60 includes the quadrilateral link mechanism 26. A drive shaft 24 (hereinafter referred to as a first rotating shaft) mounted on the shaft is disposed as a deceleration output shaft.

An auxiliary arm 32 and an upper arm 28 constituting the quadrilateral link mechanism 26 are pivotally attached to the tip of the shaft 24, and a boss 64 is inserted through the middle of the shaft 24 and fixed at a predetermined position. There is.

A pressing plate 66 extending in the radial direction of the boss 64 is integrally formed therein.

Next, an L-shaped support plate 68 is fixed to the upright frame 20 that supports the second hydraulic motor 60 on the outside and houses the reducer 62 in the vicinity of the reduction output shaft 24 (the sixth (see figure).

A through hole 72 is bored in the horizontal direction in the L-shaped protrusion 70 of this L-shaped support plate 68, and a threaded groove is threaded inside the hole.

An elongated screw shaft 74 is inserted and screwed into the through hole 12 and extends in the axial direction, with the tip of the screw shaft abutting against the pressing plate 66 (see FIG. 6).

The end of the screw shaft 74 is formed into a head 76 having a rectangular cross section so that a hand handle, spanner, etc. can be removably fitted therein.

Therefore, if the screw shaft 74 is rotated by a suitable means such as a handle (not shown), the screw shaft 74 will slowly advance and retreat in the axial direction, and the screw shaft 74 will move forward and backward slowly in the axial direction, and the screw shaft 74 will be able to come into contact with the suppressing plate 66 at the tip of the screw shaft. However, it would be understandable to impose a predetermined rotation angle limit (see FIG. 7).

As will be described later, after determining the optimum pouring amount by moving the screw shaft 74 forward and backward, the hexagonal nut 78 must be tightened to prevent the screw shaft from loosening due to vibrations applied to the pouring device and deviating from the predetermined setting position. It is preferable to screw it onto the outer periphery of the screw shaft 74 and tighten it to fix it in a fixed position.

Further, returning to FIG. 6, a collar 77 is loosely fitted approximately in the middle of the screw shaft 74 extending between the pressing plate 66 and the L-shaped protrusion 10, and a pair of collars 77 are provided with reference numerals 80 and 80. The collar 78 is held in place by the washer and held at a predetermined position on the screw shaft T4.

A limit switch mounting plate 82 is fixed to the collar 78 in parallel with the screw shaft 74, and a limit switch 84 is further mounted to the mounting plate 82.

In this case, the roller pusher 86 extending outward from the limit switch 84 body is positioned so as to protrude slightly forward (to the left in FIG. 6) from the tip of the screw shaft 74 in the unenergized state. It is preferable to set this.

In this way, the collar 77 to which the limit switch mounting plate 84 is fixed is loosely inserted into the screw shaft 74, so that when the screw shaft 74 rotates, the limit switch mounting plate 82 (and the limit switch 84 ) moves forward and backward together with this screw shaft T4, but does not rotate together with the screw shaft 74.

Furthermore, in order to help the screw shaft 74 advance and retreat smoothly, a guide rod 88 is disposed parallel to the screw shaft 74 as shown in FIG.
It is preferable that the guide rod 88 be inserted into a through hole 90 formed in the L-shaped protrusion 70.

Note that the limit switch 84 is connected to the second hydraulic motor 6.
0 and is configured as part of the pedestal circuitry to energize and de-energize.

Next, the operation and effect of the hot water amount adjusting mechanism according to the present invention configured as described above will be explained below.

As already explained with reference to FIG. 2, the sprocket wheel 46 fixed to the shaft 24 serving as the reducer output shaft and the sprocket wheel 44 fixed to the ladle shaft 42 are connected via a chain. Therefore, the angular displacement when the shaft 24, that is, the sprocket wheel 46 rotates, directly appears as the tilting angular displacement of the ladle 40.

Therefore, for example, as shown in FIG. 8, if the pressing plate 66 connected and fixed to the shaft 24 is tilted to the left by 30 degrees with respect to the perpendicular line, the ladle 40 will respond by tilting by 30 degrees with respect to the reference plane.
It will be understood that the ladle 40 is inclined downward, and a volume of molten metal corresponding to this angle of inclination can be stored in the ladle 40.

Therefore, in the configuration shown in FIGS. 6 and 7, first loosen the hexagonal nut l-78 to release the fixation of the screw shaft 74, and then insert a suitable hand handle or spanner (not shown) into the head of the screw shaft 74. When the screw shaft 74 is fitted into the portion 76 and rotated, the screw shaft 74 moves forward or backward in the axial direction depending on the direction of rotation.

Now, when the screw shaft 74 is advanced to the left as much as possible in FIG. 7, the clockwise rotation of the suppressing plate 66 (that is, the shaft 24) is stopped at the A position.

Furthermore, when the screw shaft 74 is moved back to the right as much as possible, the pressing plate 6
The rotation of 6 is stopped at the C position.

Therefore, for example, the inclination angle of the ladle 40 at position A is set to 0.
If the chains 52 and 54 are positioned so that the angle of inclination is 30° at position B and 60° at position C, then by adjusting the extension distance of the screw shaft 74, it is possible to move from position A to position C. The tilting angle of the ladle 40 can be adjusted steplessly and arbitrarily within the range of the rotation angle of 60 degrees.

Therefore, the amount of molten metal corresponding to the volume of the product to be cast by the die-casting machine 14 can be easily and arbitrarily adjusted by adjusting the tilting angle of the ladle 40 by adjusting the forward and backward movement of the screw shaft 74.

Also, in the case of trial pouring, the optimum amount can be quickly determined by adjusting the pouring amount by changing the ladle tilt angle.

Once the optimum amount of molten metal is determined in this way, the hexagonal nut 78 is firmly tightened and fixed on the screw shaft 74.
Prevent loosening due to vibration etc.

The ladle 40, which is tilted at a predetermined angle after determining the optimum pouring amount in this way, is buried in the molten metal 58 of the receptacle 56, and then, as explained earlier, the first hydraulic motor 92 (FIG. 5)
The quadrilateral linkage mechanism 26 operates under the action of the ladle 40.
After controlling the posture of the ladle 40 so that it is in a horizontal state, it moves to the hot water supply position g by following the trajectory shown in Fig. 3.
It reaches and stops.

Next, the second hydraulic motor 60 is energized and rotates the shaft 24 counterclockwise, so that the chain-connected ladle 40 also slowly tilts counterclockwise to drain the molten metal in the ladle 40. Pour into the pouring hottuber 16.

When the pouring is finished, the first hydraulic motor 92 restarts and operates the quadrilateral link mechanism 26, and returns to the original position again following the reverse trajectory in FIG. 3, but at this time, the first hydraulic motor 60 After reversing the situation, the ladle 40 is now rotated clockwise to prepare for pumping up the molten metal.

However, since the screw shaft 78 extends near the shaft 24 as shown in FIG.
The second hydraulic motor 6 comes into contact with the roller pusher 86 of the
0 input is turned OFF, and further comes into contact with the tip of the screw shaft 78, and the clockwise rotation is finally blocked.

Since this final stop position is the optimal pouring position set in advance, the ladle 40 is set at an inclination angle that provides the most suitable pouring amount, is immersed into the molten metal in the crucible 56, and is again placed in the next position. Start pouring work.

Next, FIGS. 9 and 10 show another embodiment of the present invention, in which the screw shaft 74 is rotated not manually but by an actuator, making remote control possible. .

That is, in the embodiment described above, the optimal amount of poured metal can be determined by tilting the ladle 40 at a predetermined angle, so there is no need to replace the ladle every time the mold is replaced, and work efficiency is improved. The screw shaft 7 for setting the ladle inclination angle makes a great contribution to the
The rotation operation No. 4 must be performed manually by an operator approaching the pouring device installed near the melting furnace, which leaves some problems in terms of safety.

Furthermore, while manual adjustment is being performed, it is necessary to stop the operation of the pouring device from the viewpoint of ensuring the safety of the workers.

In the embodiment shown in FIG. 9, the screw shaft 74 is rotated by a suitable actuator means to enable remote control, thereby solving the above-mentioned problems.

In this embodiment, a torque motor 9 is used as the actuator.
A pinion gear 98 is fixed to the rotating shaft 96 of this torque motor 94.
8 is a threaded gear 10 screwed and inserted into the threaded shaft 74;
It meshes with 0.

That is, the threaded gear 100 has a thread groove cut into its center through hole and is screwed onto the outer periphery of the threaded shaft 74, and is structured so that the threaded gear 100 does not move in the axial direction with respect to the threaded shaft 74. be.

Therefore, when the torque motor 94 rotates, the threaded gear 100 meshing with the pinion gear 98 rotates in the opposite direction, but since the threaded gear 100 cannot move in the axial direction, the threaded shaft 14 is rotated in the axial direction. I will send it out.

In this way, the screw shaft 14 can be moved forward and backward in the axial direction by the biasing of the torque motor 94, and it is possible to limit the rotation angle of the suppression plate 66 as in the first embodiment.

In the case of this embodiment, since the screw shaft 74 performs linear motion without rotating itself, the through hole 72 formed in the L-shaped protrusion 70 that supports the screw shaft 74 has a thread groove. There is no need to thread the limit switch mounting plate 82, and the limit switch mounting plate 82 may be directly attached to the screw shaft 74 without intervening a collar.

If actuator means such as a torque motor is adopted in this way, the inclination angle of the ladle 40 can be adjusted remotely, which is extremely advantageous in terms of ensuring work safety, and can also be adjusted without stopping the operation of the pouring device. Since the work can be completed, work efficiency can be improved.

In addition to the torque motor, various other means can be used as the actuator means as long as they can realize the linear backward motion of the screw shaft 74, and hydraulic means such as hydraulic pressure, or the attraction and repulsion force of an electromagnet can be used. Electromagnetic means and the like are preferably used.

Next, FIGS. 11 and 12 show an embodiment in which the hot water amount adjustment mechanism according to the present invention is applied to a two-arm type automatic water heater.

In this case, the link mechanism connected to the drive shaft basically consists of a main arm 102 and a ladle support arm 104.

That is, as can be clearly seen from FIG. 12, the main arm 102 is rotatably pivoted at one end thereof to the second rotating shaft 22 connected to the first hydraulic motor 92.
A common shaft 47 is arranged and fixed at the other end.

A rotary bearing 106 is disposed on the common shaft 47, and an end portion of the common shaft 47 is fixed to the ladle support arm 104.

In addition, as shown in the figure, a sprocket wheel 50 is attached to the common shaft 47.
is fixed, and a sprocket wheel 1 is fixed to the rotating bearing 106.
Further, a sprocket wheel 46 is fixed to the second rotating shaft 22, and twin sprocket wheels 112 and 114 are rotatably arranged via a bearing 116. There is.

Then, as shown in FIG. 12, the sprocket wheels 46 and 5
0, a chain 118 between the sprocket wheels 108 and 114, and a chain 52 between the sprocket wheel 110 and the sprocket wheel 44 provided at the tip of the ladle support arm 104. It's hung.

Further, a sprocket wheel 120 is arranged and fixed on the rotating shaft 24 connected to the second hydraulic motor 60, and a chain 1 is connected between the sprocket wheel 120 and the sprocket wheel 112.
22 is wrapped.

Note that fixing the pressing plate 66 to the rotating shaft 24 and arranging the adjusting member (screw shaft) on the other end of the suppressing plate so that it can move forward and backward is the same as in the first and second embodiments already described. The same is true for .

In the two-arm type automatic water heater constructed in this manner, the ladle 40 is held horizontally and immersed in the molten metal 58 of the crucible 56, and is located at position a, as shown in FIG.

Then, when the second hydraulic motor 60 is energized, the shaft 22 rotates, causing the sprocket wheel 120 to rotate.
The rotational force is transmitted through the path of 2→sprocket wheel 44, and it is possible to tilt the ladle 40.

Therefore, as previously explained in the section of the first embodiment, by adjusting the rotation stop position of the rotary shaft 24 by the combination of the suppressing plate 66 and the screw shaft 74, the tilting angle of the ladle 40 can be kept within a predetermined range. The optimum amount of molten metal can be set according to the volume of the product to be cast.

In addition, to explain an example of the operation of this two-arm type automatic water heater, when the first hydraulic motor 92 is driven, the rotating shaft 22
The sprocket wheel 46 fixed to the sprocket wheel 46 rotates the sprocket wheel 50 via the chain 54, and the ladle support arm 104 fixed to the common shaft 47 follows the trajectory shown by the dashed line in FIG. 11 to reach the hot water supply position g.

During this process, the second hydraulic motor 60 operates to control the rotation of the shaft 24 and keep the ladle 40 in a horizontal state at all times.

Next, after reaching the hot water supply position g, the second hydraulic motor 6
0 is energized to rotate the shaft 24 counterclockwise, the ladle 40 is rotated about the shaft 42, and the molten metal drawn into the tilting sasse tee is injected into the hopper 16 of the die-casting machine.
Finish automatic hot water supply work.

As explained above, according to the present invention, the ladle inclination angle of the pouring device consisting of a quadrilateral link mechanism or two arms can be freely adjusted, and the optimum pouring amount can be adjusted. This eliminates the complicated work of frequently replacing the ladle in order to find the ladle with the optimum amount of molten metal to pour, and enables safe and efficient adjustment work.

The present invention has been described above with reference to preferred embodiments, but
The present invention is not limited to this embodiment, but many improvements and changes can be made within the spirit of the invention.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a ladle with a notch used in a conventional pouring device, FIG. 2 is a schematic diagram of an automatic water supply device for a die-casting machine proposed by the applicant, and FIG. 4 is a schematic diagram showing the trajectory of the ladle in the process from the crucible to the hot water supply position in the water heater shown in FIG. , FIG. 5 is a plan view seen from direction B in FIG. 4, and FIG. 6 is a plan view of the hot water amount adjustment mechanism according to the present invention (however,
(For ease of understanding, the guide rod shown in Figure 1 is omitted), Figure 7 is a side view of the mechanism shown in Figure 6 (However, for ease of understanding, the guide rod shown in Figure 6 is omitted). 8 is a schematic explanatory diagram showing the relative relationship between the inclination angle of the pressing plate and the inclination angle of the ladle, and FIGS. 9 and 10 show another embodiment of the present invention. FIGS. 11 and 12 are a plan view and a side view, respectively, of the example, and FIGS. 11 and 12 are a side view and a sectional view, respectively, showing still another embodiment of the present invention. 10... Ladle, 12... Notch groove, 1
4...Die casting machine, 16...Pouring hopper, 18...Melting furnace, 20...Frame, 22, 24...Shaft , 26...
Quadrilateral link mechanism, 28... Upper arm, 30
... lower arm, 32 ... auxiliary arm, 34 ... ladle support arm, 36 ...
・Drive arm, 38...Axis, 40...
Ladle, 42...Axis, 44.46, 48.50
... Sprocket car, 47 ... Axis, 5
2, 54... Chain, 56... Crucible, 58... Molten metal, 60... Second
Hydraulic motor, 62...Reducer, 64...
・Boss, 66...Press plate, 68...L
Shape support plate, 10... L-shaped protrusion, 72...
...Through hole, 74...Screw shaft, 76...
・Head, 77...Collar, 78...Hex nut, 80...Washer, 82...Limit switch mounting plate, 84...・Limit switch, 86... Roller pusher, 88...
...Guide rod, 90...Through hole, 92...
...First hydraulic motor, 94...Torque motor, 96...Rotating shaft, 98...Pinion gear 100...Threaded gear 102...
... Main arm, 104 ... Ladle support arm,
106... Rotating bearing, 108, 110, 112
, 114, 120...Sprocket car, 116
...Bearing, 118,122...Chain.

Claims (1)

[Claims] 1. A frame is installed between the die-casting machine and the crucible, and four sides are formed by an upper arm, an auxiliary arm, a lower arm, and a ladle support arm that rotate around a drive shaft rotatably attached to the frame. In a water heater for a die-casting machine equipped with a shaped link mechanism, a pressing member is attached to a boss provided on a part of the drive shaft, and a supporting member fixed to a frame is attached to the pressing member to set the tilting angle of the ladle with respect to the suppressing member. Screw shafts that are screwed together and configured to move forward and backward are disposed facing each other, and a limit switch that comes into contact with a pressing member and detects its position is also provided on the screw shaft to adjust the reversal or rotation stop position of the ladle. A hot water amount adjustment mechanism for a water heater, characterized in that it is configured to. 2. A hot water amount adjusting mechanism for a hot water supply device as set forth in claim 1, wherein an actuator is provided at one end of a screw shaft for automatically moving the screw shaft forward and backward.