JPH0755486Y2 - Repetitive force inspection jig for stalk presser spring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a spring repetitive force inspection jig for urging a stalk of a low-pressure casting machine or the like toward a mold.

(Prior art and its problems) Conventionally, in a low-pressure casting machine, the molten metal in the lower crucible is supplied to the upper die through a stalk, and this stalk is used to improve the adhesion with the die. , It is always biased to the mold side through the spring, and if the biasing force of the spring is attenuated, the adhesion of stalk is hindered.Therefore, the repetitive force of the spring is regularly inspected. In order to check the repetitive force of the spring, the device is disassembled one by one, the spring is taken out to the outside, and the repetitive force of the spring is inspected by a mounting inspection jig. However, in such a conventional inspection method, it is necessary to remove the spring from the low-pressure casting machine, which requires a lot of labor and time for the inspection, and there is a problem that workability deteriorates.

(Means for Solving the Problem) The present invention has been devised in view of the above-mentioned conventional problems, and an object thereof is not to provide an inspection jig that can easily inspect the repetitive force of a spring for holding a stalk. The gist is a jig for inspecting the repetitive force of a spring that urges a stalk vertically installed in a low-pressure casting machine to the mold side in order to supply molten metal into the mold. The jig includes two or more guide pins that are detachably fixed to a die mounting position of the low-pressure casting machine, an upper plate having a hydraulic cylinder fixed to the guide pins, and the guide pins below the upper plate. A pressure plate that is movably arranged side by side and that is connected to the rod of the hydraulic cylinder and that can press the spring from above by the operation of the hydraulic cylinder. It is configured so that the repetitive force of the spring can be measured.

(Function) When inspecting the repetitive force of the stalk presser spring of the low-pressure casting machine, with the mold removed, fix the guide pin at the mold mounting position, operate the hydraulic cylinder, and press the pressing plate with the hydraulic cylinder. Is pressed against the spring from above and the spring repeats due to the amount of movement of the pressing plate when the hydraulic cylinder is pressurized with a constant pressure, or the pressure applied to the hydraulic cylinder when the pressing plate is moved by a certain amount. The force can be measured, and the spring whose damping of repetitive force is remarkable can be replaced in advance to maintain good airtightness between the stalk and the mold.

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

FIG. 1 is a schematic configuration diagram of the inspection jig set in a predetermined position of a low-pressure casting machine, and FIG. 2 is a plan configuration diagram of the inspection jig.

In the figure, a ring-shaped stalk receiver 3 is provided in the center of the lower die base 1 on which a die can be placed, and the ring-shaped stalk receiver 3 is flush with the lower die base 1. The stalks 2 are arranged in a drooping manner, and the lower end portion of the stalks 2 is immersed in a crucible storing molten metal (not shown). As described above, a mold is usually installed on the upper surface side of the stalk 2, and the spring 4, on the lower surface side of the stalk receiver 3 in order to bring the upper end of the stalk 2 into close contact with the mold. 4 is provided, and the stalk 2 is always urged to the mold side through the stalk receiver 3 by the urging force of the spring 4.

When the repetitive force of the spring 4 is attenuated, the adhesion between the souk 2 and the mold is deteriorated.
Therefore, the inspection jig A of this example is attached to the attachment position of the die for inspection. That is, the inspection jig A is mainly composed of a guide pin 7, an upper plate 9 provided with a hydraulic cylinder 10, and a pressing plate 11 that is moved downward by the hydraulic cylinder 10, and the inspection die A is preliminarily mounted on the lower die base 1. A jig receiver 5 for fixing the inspection jig A detachably is fixedly provided on the inner peripheral surface. The jig plate 6 of the inspection jig A can be fitted into the recess of the inner periphery of the ring-shaped jig receiver 5 in a wrap-around manner from above and attached to the ring-shaped jig plate 6. In this example, three guide pins 7,7,7 are arranged upright at equal intervals, and each guide pin 7,7,7
An upper plate 9 is horizontally fixed to the upper end of the via a fixed frame 8. A hydraulic cylinder 10 is fixed to the center of the upper plate 9, the rod of the hydraulic cylinder 10 hangs downward, and a pressing plate 11 is connected to the lower end of the rod 10a. Both ends of the pressing plate 11 are connected to the movable frame 12, and the movable frame 12 internally mounts a bearing portion 12a and is movably attached to each of the guide pins 7, 7, 7. Further, coil springs 13, 13, 13 are fitted onto the outer circumference of the guide pin 7 below the movable frame 12, and the movable frame 12 is always urged upward by the coil springs 13, 13, 13. In addition, the pressing plate 11
Three adjusting bolts 14 are fixedly installed in a pendant shape, and each adjusting bolt 14, 14, 14 is provided with the stalk receiver 3
Can be abutted on the upper surface side of. Further, a manual pump 19 is connected to the hydraulic cylinder 10 via a hydraulic hose 17, and a pressure meter 18 is installed in a branched shape on the hydraulic hose 17. Reference numeral 15 in the drawing is a gauge erected on the upper plate 9, 16 in the drawing is a pointer erected on the pressing plate 11, and the upper end of the pointer 16 is close to the gauge 15. Are arranged.

In such a configuration, as described above, the jig plate 6 can be fitted and attached to the attachment position of the die in the state where the die is removed, and the manual pump 19 is manually operated after the attachment. By sending hydraulic pressure to the hydraulic cylinder 10, the rod 10a of the hydraulic cylinder 10 is extended and the pressing plate 11 is moved downward along the guide pins 7, 7, 7. It should be noted that the adjusting bolts 14, 14, 14 are adjusted in advance before the pressing plate 11 is moved, and the lower ends thereof are brought into contact with the upper surface side of the stalk receiver 3, so that the stalk receiver 3 and the lower ends of the adjusting bolt 14 are It is necessary to set the gap between the
When the pressing plate 11 is moved downward by 10, the adjusting bolts 14 press the stalk receiver 3 downward, and the springs 4 and 4 downward. Confirming that the pressing plate 11 has been moved 10 mm downward while looking at the pointer 16 with respect to the gauge 15, by reading the pressure of the pressure meter 18 at that time, the measured value of the pressure meter 18 causes the springs 4 and 4 to move. Repeatability can be measured.
That is, the relationship between the measured value of the pressure meter 18 and the repetitive force of the spring 4 against it is shown in a diagram in advance, and from the value of the pressure meter 18 read based on the measurement table of the represented diagram, The repeating force of the spring 4 can be known. For example, as a measurement example, when the measured value of the pressure meter 18 is 136 kg / cm ^{2 with} the 10 mm pressing plate 11 lowered, the repetitive force of the spring 4 is 700 kgf, which can be estimated from the measurement table. If the repetitive force of the generated spring is less than or equal to a predetermined value, it is recognized that the repetitive force of the spring 4 is attenuated, and the spring 4 needs to be replaced.

As another method, the pressure cylinder 10 can be operated at a constant pressure.
If it can be pressurized, the moving amount of the pressing plate 11 can be measured by the reading value of the gauge 15, and the repetitive force of the spring 4 can be measured by this moving amount.

Thus, in this example, the spring 4
It is not necessary to remove the spring 4 from the low-pressure casting machine one by one in order to measure the repetitive force of the inspection, and the inspection jig A is attached to the attachment position of the mold with the normal attachment state, and the manual pump 19 is operated. By doing so, the repetitive force of the spring 4 can be easily measured, and the spring 4 can be inspected quickly and satisfactorily.

(Effect of the Invention) The present invention is a jig for inspecting the repetitive force of a spring that urges a stalk vertically installed in a low-pressure casting machine to supply the molten metal into the mold. The jig is detachably fixed to the die mounting position of the low-pressure casting machine.
The guide pin described above, an upper plate fixed to the guide pin and having a hydraulic cylinder, and arranged below the upper plate so as to be movable along the guide pin and connected to a rod of the hydraulic cylinder. The spring is removed from the low-pressure casting machine by being provided with a hydraulic plate capable of pressing the spring from above by the operation of a hydraulic cylinder, and being configured so that the repetitive force of the spring can be measured by the movement amount of the pressing plate or the like. Without the need to attach the inspection jig to the die mounting position with one touch, the repetitive force of the spring can be easily measured and inspected by the pressure applied by the hydraulic cylinder or the moving amount of the pressing plate. It has the effect that it can be carried out quickly.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a schematic configuration diagram in which an inspection jig is set above a stalk, and FIG. 2 is a plan configuration diagram of the inspection jig shown in FIG. A: Inspection jig 1 ... Die base, 2 ... Stoke 3 ... Stoke receiver, 4 ... Spring 5 ... Jig receiver, 6 ... Jig plate 7 ... Guide pin, 9 ... Top plate 10 ...... Hydraulic cylinder, 11 …… Pressing plate 14 …… Adjust bolt, 15 …… Gauge 18 …… Pressure meter, 19 …… Manual pump

Claims (1)

[Scope of utility model registration request] 1. A jig for inspecting the repetitive force of a spring for urging a stalk vertically installed in a low-pressure casting machine to the mold side in order to supply molten metal into the mold. The ingredients are
Two or more guide pins detachably fixed to the die mounting position of the low-pressure casting machine, an upper plate having a hydraulic cylinder fixed to the guide pins, and moved below the upper plate along the guide pins. And a pressing plate that is arranged in parallel with each other and that is connected to the rod of the hydraulic cylinder and can press the spring from above by the operation of the hydraulic cylinder. The repetitive force of the spring depends on the movement amount of the pressing plate. A repetitive force inspection jig for a stalk pressing spring, which is characterized in that it can measure