JPH0257464B2 - - Google Patents

Description

[Detailed description of the invention]

[Field of Application of the Invention] The present invention relates to an automatic water supply device for a die-casting machine that draws molten metal in a crucible and supplies it to a pouring port of the die-casting machine. [Background of the Invention] As shown in FIG. 3, this type of automatic hot water supply device for a die-casting machine has a small arm 3 rotatably pivoted to the tip of a large arm 2 whose base end is fixed to a reciprocating rotation shaft 1. , a ladle 4 was attached to the tip of this small arm 3. Then, the molten metal 6 in the crucible 5 is drawn up by the ladle 4 at the position shown by the solid line in FIG. Then, the ladle 4 is lifted to the position shown by the two-dot chain line, and then the trajectory of the ladle 4 becomes almost horizontal, and the ladle 4 is moved to the position shown by the broken line, and the molten metal 6 in the ladle 4 is poured into the pouring port 7. I was bathing. By repeating the reciprocating movement of the ladle 4 between the crucible 5 and the spout 7 in this manner, the molten metal 6 in the crucible 5 was conveyed to the spout 7 of the die-casting machine. However, in general, the pouring port 7 of a die-casting machine
Because the distance from the crucible 5 is 1.4 to 1.7 m, the hot water supply time is too long, and especially when the amount of molten metal 6 in the ladle 4 is small, the temperature of the molten metal 6 itself decreases during transportation. There were drawbacks such as poor casting quality. In addition, since the amount of hot water supplied was adjusted by the inclination of the ladle 4, even a slight change in the angle of inclination of the ladle 4 caused a significant change in the amount of molten metal 6 supplied, resulting in poor water supply accuracy. . Furthermore, an automatic hot water supply device as described in Japanese Patent Publication No. 44-9644 has been proposed. In this device, a ladle is rotatably connected to the lower end of a hanging rod that moves up and down via a pin, and a connecting rod is arranged parallel to this hanging rod, and the lower end of the connecting rod is connected to the ladle through a pin. connected to the section. A lifting piece screwed into a screw rod is connected to the upper end of the connecting rod, and the screw rod is connected to a motor via a gear and a worm gear. Therefore, by rotating this motor, the screw rods rotate together, and this rotational movement is converted into vertical movement by the lifting piece, and the vertical movement of the connecting rod causes the ladle to move around the connection point with the hanging rod. The configuration is such that the ladle can be rotated to maintain the position of the ladle. A simple explanation of how this automatic water heater works is as follows.
lowering the connecting rod and immersing the ladle into the molten metal;
By subsequently raising the connecting rod, the ladle draws up the molten metal, and by driving the motor, the ladle is rotated and the molten metal in the ladle is transferred to the gutter. In this device, the amount of molten metal pumped up is adjusted by rotating the motor to control the tilted posture of the ladle, thereby causing unnecessary molten metal to overflow from the ladle. However, this device has a mechanism that converts rotational motion into vertical motion by a combination of a screw rod and a lifting piece, so the weight of the ladle and the weight of the molten metal pumped by the ladle are directly affected by the screw. It is attached to the threaded part between the rod and the lifting piece. Therefore, when the screw rod is rotated to transfer the molten metal in the ladle to the gutter or to control the amount of molten metal pumped up, the threaded portion is subject to severe wear. In other words, since the threaded part of the lifting piece pulled downward by the aforementioned load slides against the threaded part of the screw rod that rotates in the horizontal direction, wear at this sliding contact part becomes a problem. . If this portion is severely worn, even if the screw rod is rotated by a predetermined angle by the motor, the angle of inclination of the ladle will be different before and after the wear. Furthermore, abrasion powder is trapped between the screw rod and the lifting piece, which prevents the lifting piece from moving up and down smoothly, making it impossible to maintain the ladle in a desired tilted state. For this reason, the amount of molten metal pumped varies, causing problems in reliability and operability. [Object of the Invention] The present invention attempts to eliminate such conventional drawbacks, and its purpose is to shorten the conveyance distance as much as possible, shorten the hot water supply time, prevent a drop in hot water temperature, and improve the accuracy of hot water supply. The purpose of this invention is to obtain an automatic hot water supply device for a die-casting machine that can improve the performance of the die-casting machine. [Summary of the Invention] In order to achieve the above-mentioned object, the present invention provides an automatic water supply device for a die-casting machine that pumps up molten metal in a crucible with a ladle and supplies it to a pouring spout, which is arranged so as to be movable upwardly and downwardly above the crucible. a frame driving cylinder for moving the elevating frame upward and downward; a guide means for guiding the upward and downward movements of the elevating frame; an attached rack, a rack driving cylinder mounted on the lifting frame to move the rack up and down, a pinion that meshes with the rack and rotates at a fixed position on the lifting frame, and integrally with the pinion. A rotating drive sprocket, a driven sprocket that is provided at a lower position of the elevating frame to face the drive sprocket and rotates together with the ladle, and a suspension between the drive sprocket and the driven sprocket. and a hot water level detection means attached to the elevating frame, and with the rack drive cylinder shortened,
The frame driving cylinder is extended, the ladle is immersed in the molten metal to draw up the molten metal, the frame driving cylinder is shortened, and while the ladle is being raised, the rack driving cylinder is partially extended, and the pinion is removed. , the ladle is rotated through the drive side sprocket, chain, and driven side sprocket until it becomes horizontal, and while maintaining the horizontal position of the ladle, the frame drive cylinder is further shortened to move the ladle to the vicinity of the pouring point. The ladle is raised and the rack driving cylinder is extended to rotate the ladle and pour the ladle. [Embodiments of the Invention] Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view showing an automatic hot water supply device for a die casting machine according to an embodiment of the present invention, and FIG.
FIG. 2 is an explanatory diagram showing how hot water is supplied by the ladle shown in the figure. In FIGS. 1 and 2, reference numeral 4 indicates a ladle, 5 indicates a crucible, 6 indicates a molten metal, and 7 indicates a pouring port, which are the same as the conventional ones. 8 is a lifting mechanism that moves the ladle 4 upward and downward, and this lifting mechanism 8 includes a lifting frame 9 and guide bars 10 and 1 that support the lifting frame 9.
0, guides 11, 11, and a cylinder 12. Reference numeral 13 denotes a rotating mechanism that rotates the ladle 4 and pours the molten metal. 19. Raise and lower the sprocket 20 to the frame 9
It is composed of a driven shaft 21 supported by a chain 22. 23 is a gutter, and 24 is a hot water level detection electrode. In such a structure, when the molten metal 6 in the crucible 5 is pumped up by the ladle 4, the elevating frame 8 and the rotating mechanism 13 are both lowered toward the crucible 5 side. That is, as the cylinder 12 expands, the air cylinder 14, rack 15, pinion 16, sprocket 17, drive shaft 18, support arm 19, sprocket 20, driven shaft 21, chain 22, hot water The surface sensing electrode 24 and the ladle 4 are all guided along the guides 11, 11 and the guide bars 10, 10, and descend toward the crucible 5 side. In this way, the position where the molten metal 6 enters the ladle 4 (first
When it descends to the level shown in the figure), the descending is temporarily stopped by the hot water level detection electrodes 24, 24. Then, after measuring the time necessary until the molten metal 6 of the crucible 5 is pumped into the ladle 4 by a timer (not shown), the drive frame 8 and the rotation mechanism 13 also rise due to the contraction of the cylinder 12.
When rising, the ladle 4 is moved by the rotation mechanism 13 as shown in FIG. Hereinafter, the manner in which the ladle 4 shown in FIG. 1 moves will be described using FIG. 2, and for convenience of explanation, the ladle 4 will be referred to as ladle 4a, 4b, 4c, 4d, and 4e. In other words, the ladle 4a in FIG. 2 is located at the point where the ladle 4 in FIG. 1 draws the molten metal 6 from the crucible 5. When the ladle 4a stops at the pouring point, a timer (not shown) operates, and when the timer expires, the ladle 4a is raised to the ladle 4b by the elevating mechanism 8 shown in FIG. 1 and stopped. This movement from the ladle 4a to the ladle 4b is caused by the contraction of the cylinder 12 in FIG.
5, pinion 16, sprocket 17, drive shaft 1
8, support arm 19, sprocket 20, driven shaft 21
and ladle 4 are all lifted by contraction of cylinder 12. When the ladle 4a is lifted up to the position of the ladle 4b and the ladle 4b stops, the excess molten metal 6 in the ladle 4b overflows into the crucible 5 and is measured. When a timer (not shown) times up, the ladle 4b is moved to a horizontal position with respect to the ladle 4c, and the molten metal 6 in the ladle 4c is prevented from spilling. That is, in the movement from the ladle 4b to the ladle 4c, the rack 15 is lowered by the expansion of the air cylinder 14 shown in FIG. 1, and the pinion 16 engaged with the rack 15 is rotated counterclockwise. As the pinion 16 rotates counterclockwise, the sprocket 17 and drive shaft 18 are also rotated counterclockwise, and the chain 22 rotates the sprocket 2.
0, the driven shaft 21, the support arm 19, and the ladle 4 are rotated counterclockwise to be driven from the position of the ladle 4b in FIG. 2 to the position of the ladle 4c. Then, the ladle 4c in FIG. 2 is raised to the upper limit position by the lifting mechanism 8 in FIG. 1, and stopped at the position of the ladle 4d in FIG. 2. Here, in response to a pouring signal from the die-casting machine, the ladle 4d in FIG. That is, the rotation from the ladle 4d to the ladle 4e in FIG. 2 is achieved by extending the air cylinder 14 in the same manner as described above, lowering the rack 15, and moving the pinion 16, sprocket 17, and drive shaft 18 counterclockwise. The sprocket 20, driven shaft 21, support arm 19, and ladle 4 are rotated counterclockwise by the chain 22, and the support arm 19 and ladle 4 are rotated counterclockwise using the driven shaft 21 as a fulcrum. By rotating the ladle 4d, the ladle 4d is turned over to the position of the ladle 4e, as shown in FIG. 2, and the ladle 4e is poured. The ladle 4e in FIG. 2 is timed by a timer (not shown), returns to the position of the ladle 4d, and waits for the next cycle. In this way, the ladle 4 shown in FIG.
The molten metal 6 in the crucible 5 is moved as shown in c, 4d, and 4e and is supplied from the gutter 23 through the pouring port 7. According to an experiment conducted by the inventor on shortening the transport distance of the ladle 4, it was confirmed that the transport distance of water heaters with the same ladle capacity was significantly shortened as shown in the table below.

[Table] However, the transport distance of the ladle marked with * in the table is
This refers to the transport distance from ladle 4a to ladle 4d in Figure 2.
[Effects of the Invention] According to the present invention, the ladle is driven by an elevating mechanism that moves the ladle upward and downward into the molten metal in the crucible and a rotating mechanism that rotates the ladle and pours the metal. As a result, it is possible to shorten the conveyance distance of the molten metal, shorten the hot water supply time, and prevent a drop in the temperature of the hot water during conveyance.Moreover, in the present invention, the conveyance distance of the molten metal can be shortened, and a drop in the hot water temperature can be prevented during conveyance. Since the rack moves, there is no severe wear at the threaded part unlike in conventional proposals. Furthermore, although there is naturally a certain amount of clearance, or so-called backlash, between the teeth of the rack and the teeth of the pinion, the rattle is designed so that the teeth of the pinion are always in contact with the teeth of the rack. Since the load is applied, there is no variation in the angle of inclination of the ladle due to backlash. From this, it is possible to improve the accuracy of hot water supply.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an automatic hot water supply device for a die casting machine according to an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the movement of the ladle shown in Fig. It is a sectional view showing a hot water supply device. 4... Ladle, 5... Crucible, 6... Molten metal, 7
...Pouring spout, 8... Lifting mechanism, 9... Lifting plate, 10... Guide bar, 11... Guide, 12
... Cylinder, 13 ... Rotation mechanism, 14 ... Cylinder, 15 ... Rack, 16 ... Pinion, 17
... Sprocket, 18 ... Drive shaft, 20 ... Sprocket, 21 ... Driven shaft, 22 ... Chain, 24 ... Hot water level detection electrode.

Claims (1)

[Scope of Claims] 1. An automatic hot water supply device for a die-casting machine that pumps up molten metal in a crucible with a ladle and supplies it to a spout, comprising: an elevating frame disposed to be movable up and down above the crucible; a frame driving cylinder for moving the frame upward and downward; a guide means for guiding the upward and downward movement of the elevating frame; a rack attached to the elevating frame so as to be movable upward and downward; , a rack drive cylinder mounted on the elevating frame for downward movement; a pinion that engages with the rack and rotates at a fixed position on the elevating frame; a drive side sprocket that rotates together with the pinion; and a drive side sprocket. a driven sprocket that is provided at a lower position of the elevating frame to face the sprocket and rotates together with the ladle; a chain stretched between the driving sprocket and the driven sprocket; and an attached hot water level detection means, with the rack driving cylinder in a shortened state,
The frame driving cylinder is extended, the ladle is immersed in the molten metal to draw up the molten metal, the frame driving cylinder is shortened, and while the ladle is being raised, the rack driving cylinder is partially extended, and the pinion is removed. , the ladle is rotated through the drive side sprocket, chain, and driven side sprocket until it becomes horizontal, and while maintaining the horizontal position of the ladle, the frame drive cylinder is further shortened to move the ladle to the vicinity of the pouring point. 1. An automatic hot water supply device for a die casting machine, characterized in that the ladle is rotated to pour hot water by raising the rack and extending the rack driving cylinder.