JPS5820700B2 - Casting machine casting equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a casting device for a casting machine.

In casting equipment such as centrifugal casting machines, especially in casting where the solidification rate is fast, such as centrifugal casting of pipes, and the amount of molten metal poured increases the size and weight of the immediate product, the ladle can be tilted at a constant speed to save time. When a method is adopted in which a fixed amount of molten metal is poured per ladle, the tilting of the ladle is performed at a constant speed and is usually performed by an electric drive.

However, in this case, the return tilting movement after pouring a specified amount can only be performed at the same speed as the tilting movement during casting, and furthermore, it is difficult to instantaneously switch to reverse rotation due to the inertia of the drive system.

As a result, even after pouring the specified amount, it takes time to drain completely, making it impossible to control the pouring amount accurately, and causing a lot of molten metal loss, such as small pieces of low-temperature molten metal remaining on the trough. Contamination with foreign substances such as pig iron was also a cause of defective castings.

Therefore, the present invention attempts to solve the above problem by instantaneously tilting the ladle back to the hot water draining position.

Below, one embodiment of the present invention will be described based on the drawings.
is a triangular ladle for pouring hot water, and is fixedly supported by a rotatable ladle bone 3 around two support shafts, and a tilting lever 4 extends from the ladle bone 3. By pushing and pulling the tip of this lever 4, the ladle 1 is tilted.

In this embodiment, a support shaft portion 5 is provided below the lever 4.
A rotatable drive lever 6 is disposed around the periphery, and the tips of the drive lever 6 and the lever 4 are connected by a link 7, and the lever 4, link 7, and drive lever 6 form a four-bar link mechanism. 1 drive lever 60 rotation drive shaft 80
The ladle 1 is designed to tilt in accordance with the rotation angle.

Therefore, the rotary drive shaft 8 is connected to the forward/reverse motor 9, the reducer 10,
By rotating the ladle 1 forward and backward at a constant speed via the clutch 11, the ladle 1 is tilted forward and backward at a constant speed.

In the above casting apparatus, the link 7 was conventionally a bur ring with a constant length, but in the present invention, the link 7 has a stroke S.
The elastic link 7 can be expanded and contracted.
It has a built-in cylinder device for expansion and contraction.

In the illustrated example, the telescopic link 7 itself is formed with a cylinder chamber 12 for urging it to expand, a means 13 for pumping hydraulic oil as a working fluid is provided in the cylinder chamber 12, and further, the pressurizing means 13 and the cylinder chamber A solenoid valve 14 is provided which can be switched between a state in which the cylinder chamber is electrically connected to the cylinder chamber 12 and a state in which the cylinder chamber is opened.

The pressure feeding means 13 consists of a hydraulic oil tank 15 and a hydraulic pump 17 driven by a motor 16, and a check valve 18.
is connected to the solenoid valve 14 via
Further, a return flow path is provided between the hydraulic pump 17 and the check valve 18 into the tank 15 via the relief valve 19.

Furthermore, a throttle valve 20 is installed in the oil drain flow path from the oil drain port to the tank 15 when the cylinder chamber of the solenoid valve 14 is opened.
This is so that the impact when the telescopic link 7 is contracted can be absorbed by interposing it.

Next, the operation will be explained. Prior to the start of casting, pressurized oil is supplied into the cylinder chamber 12 by the pressure feeding means 13 so that the solenoid pulp 14 is in the illustrated state, and after the telescopic link 7 is in an extended state, the motor 9 is driven. reducer 10, clutch 1
When the rotary drive shaft 8 is rotated through the rotary shaft 1, the ladle 1 is tilted at a constant speed according to the rotation angle through the four-pronged link mechanism.
A fixed amount of 9 pieces of hot water are poured per hour.

When the pouring amount reaches the specified amount, the solenoid pulp 14 is switched, and the telescopic link 7 instantly contracts, and as a result, the ladle 1 moves to (θ+).

, and the outflow of molten metal is momentarily blocked.

Here, the above-mentioned angle θ is the angle necessary to prevent the next succeeding part from flowing out when the specified amount of casting is finished, and as shown in FIG. 2, when the overflow head is δ, R2θ /2=δ, that is, θ=2δ/R, and the stroke S of the cylinder chamber 12 is designed so that the ladle 1 tilts by (θ+)o with an appropriate margin.

Then, at the same time as this telescopic link 7 contracts, the motor 7 is turned on and returns to its original position, and the telescopic link 1 still remains.
The shock caused by the instantaneous contraction of is absorbed by the throttle valve 20.

In this way, the time it takes to run out of hot water, which used to be about 2 seconds, can be drastically reduced to 0.2 seconds, and the amount of residual pig iron that is formed when small pieces of low-temperature hot water remain on the trough is reduced. The yield of molten metal has improved considerably, and defects such as foreign matter contamination of products due to residual small spherical pig iron have been reduced, and the pouring amount can be accurately cast, resulting in accurate product weight and dimensions.

It is possible to consider a method of disengaging the clutch 11 for instantaneous return tilting, but this requires a large-scale stopping brake, shock absorber, etc., and it is difficult to assemble a reliable system, so it cannot be put into practical use.

In addition, when pouring is performed several times in succession without replenishing the molten metal into the triangular ladle 1 after each pouring, the motor 9 is stopped and the telescopic link 7 is closed at the end of pouring. When the contracted state is reached and casting is started again, the telescopic link 7
If the motor 9 is extended and the motor 9 is activated, casting can be started immediately, resulting in a short cycle time.

As is clear from the above description, the apparatus of the present invention allows accurate control of the pouring amount, improves the yield of molten metal, and is highly effective in preventing product defects.

In addition, by extending the telescoping link using the pumping means again after one casting is completed, it is possible to immediately start casting again, and multiple castings can be performed in succession, reducing the casting cycle time. can be made shorter.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic configuration diagram;
FIG. 2 is an explanatory diagram of the restoration angle necessary for draining hot water. 1... Ladle, 2... Support shaft, 3... Ladle holder, 4
... Lever, 5 ... Support shaft part, 6 ... Drive lever, 7 ... Telescopic link (link), 8 ... Rotation drive shaft, 9 ... Motor, 10 ... Reducer , 11... Clutch, 12... Cylinder chamber, 13... Pressure feeding means, 1
4... Solenoid valve, 15... Hydraulic oil tank,
16...Motor, 17...Hydraulic pump, 18...
Check valve, 19...relief valve, 20...throttle valve.

Claims (1)

[Claims] 1. In a casting device of a casting machine in which the ladle is tilted by an electric drive, a telescopic link with a built-in telescopic cylinder device is interposed on the drive path, and 4. the link in the telescopic cylinder device is extended. A pressure-feeding means for force-feeding working fluid to the cylinder chamber to be energized is provided, and a valve is provided that can switch between a state in which the pressure-feeding means and the cylinder chamber are electrically connected and a state in which the cylinder chamber is opened. A casting device for a casting machine featuring: