JPH0444295Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a core placing device that automatically places a core in a mold.

(Prior Art) FIG. 3 shows a core holding device that has been commonly used in the past. In the figure, reference numeral 1 denotes a support frame, and the support frame 1 is connected to a cylinder (not shown) via a rod 2, so that the entire frame can move forward and backward relative to a mold 10.
A pair of stoppers 3 that come into contact with the flask 11 of the mold 10 to restrict the descending end are vertically installed on the support frame 1, and a pair of brackets 4 are also vertically installed. A pair of clamping cylinders 7 are attached which have clamp claws at the rod ends that clamp and hold the rod from the left and right sides. Further, a pair of core pressers 9 for pressing the core 5 against the mold are fixedly provided on the support frame 1.

In this core storage device configured in this way, the core 5 is attached to the lower end 3 of the stopper 3 of the support frame 1.
a reaches the reference surface 11a of the flask 11, and is held by the clamp claws 6 so as to fit into the mold 8. By releasing the clamp claws 6 at the lower end of the support frame 1, The core 5 can be automatically placed in the mold 10.

Note that the core presser 9 is provided with a height adjustment mechanism so that it can accommodate different types of cores.

(Problems to be solved by the invention) However, in the conventional core holding device described above, during use, the reference surface 11a often wears out or foreign matter adheres to the reference surface 11a. There is a misalignment at the lower end of the support frame 1,
There was a problem in that the core presser 9 could not press the core 5 against the mold 10 with the optimum force, and as a result, core placement failure occurred. Further, when the height level between the mold 10 and the flask 11 changes, the core placement failure also occurs. In addition, when the height of the core 5 changes, the height of the core presser 9 must be adjusted each time, which is troublesome.

In order to deal with the above problem, as shown in Fig. 4, core pressers A, B, C, and D of different lengths are provided at 90° intervals around the rotation axis, and core pressers A, B, C, and D are arranged around the rotating shaft. c,
A core holding device has been proposed that is configured to select an appropriate core presser according to the size of the core (there are three types in this figure). (Special Publication No. 56-35973).

However, in such a core storage device,
The problem was that the core could only be pressed in multiple stages, making fine adjustments impossible and lacking in versatility.

(Means for solving the problems) In order to solve the above conventional problems, the present invention
A vertically movable support frame supports a pair of left and right crank cylinders with their shafts extending horizontally and facing each other, and a clamp arm is attached vertically to the rod end of each clamp cylinder. A clamp claw is provided at the bottom end of the clamp arm to hook and hold the core from below.
Each of the clamp arms has a shaft extending vertically to support a core holding cylinder, and a pad capable of pressing the upper surface of the core is attached to the rod end of the core holding cylinder. .

(Function) With this configuration, if the clamping force of the clamp claws is released before the core comes into contact with the mold and the core is placed in the mold, even after the core is placed in the mold. As the support frame continues to descend to the lower end, the clamp claws will separate from the holding part of the core.
During this time, the core can be pressed against the mold with a constant force by the core holding cylinder. In other words, since the function of pressing the core into the mold is given exclusively to the core holding cylinder, there is no need to position the lower end of the support frame with high precision, and it can be used to press cores of different heights as desired. Be able to respond.

(Example) Next, an example of the present invention will be described with reference to FIG. Note that the same parts as in FIG. 3 are given the same reference numerals and their explanations will be omitted.

In this embodiment, a clamp arm 2 is attached to the rod end of each clamp cylinder 7 in the vertical direction.
2 is attached, and this clamp arm 22
A clamp claw 21 that can hook and hold the core 5 from below is integrally provided at the lower end of the core. Further, a core holding cylinder 24 is attached to each clamp arm 22 with its axis facing the vertical direction, and its rod end 2 facing the clamp claw 21 holds the core 5.
A butt 23 is attached to press down the top surface of. Note that 25 is a guide rod that extends from the back surface of the clamp arm 22 through the bracket 4.

The operation of this embodiment configured as above will be explained with reference to FIG. 2 as well. First, the core 5 is hooked and held from below by the clamp claws 21 of the clamp cylinder 7, and is carried onto the mold 10.

Next, the lifting cylinder (not shown) is operated to lower the support frame 1 toward the mold 10, and before the core 5 comes into contact with the mold 10 (the state shown in FIG. 1), the clamp claws 21 are clamped. cylinder 7
release the clamping force. However, this time,
Clamp claw 2 is only needed to release the clamping force.
The position of 1 remains unchanged. Therefore, the core remains retained.

Further, when the support frame is lowered, the core 5 is placed in the mold 10, and at the same time, the core 5 is pressed against the mold 10 by the core holding cylinder 24.

Even after the core 5 is placed in the mold 10, the support frame 1 continues to descend until it reaches the lower end.
At this time, the clamping force of the clamping cylinder 7 is released, so the core 5 is not held down.
Since it separates from the core 5 (see Fig. 2) and descends together with the support frame 1, the core holding cylinder 24
can press the core 5 against the mold 10 with a constant force. Note that even if the height of the core 5 changes, the core holding cylinder 24 holds the core 5 in the mold 10.
can be pressed down with a certain force.

In addition, since there is no need to position the support frame 1 for lowering, the stopper 3 and the reference surface 11a are unnecessary, and problems caused by these, such as wear of the reference surface 11a or foreign matter adhering to the reference surface 11a, can be avoided. This eliminates all problems such as the lowering end of the support frame 1 being distorted and the core presser 9 not being able to press the core 5 against the mold 10 with the optimum force.

(Effects of the invention) As detailed above, according to the core holding device according to the invention, the core can be pressed against the mold with a constant force by the core holding cylinder, and as a result, the core is It is no longer necessary to position the descending end of the support frame with high precision so that it fits into the mold, making the production of this core holding device much easier, and since there is no need for a reference surface, it is also easier to produce the casting flask. It became easy. Moreover, since the clamp arm has a cylinder for holding the core, there is no need to worry about interference between the two, and there is no need to apply a large bending load to the core, making it possible to realize a highly reliable device.

Further, even if the height of the core changes, this core presser can sufficiently handle the change, so the core holding device of the present invention is highly versatile.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the core accommodating device according to the present invention, Fig. 2 is a side view showing how the present core accommodating device is used, and Fig. 3 is a conventional general core accommodating device. FIG. 4 is a side view showing a modification of the conventional core accommodating device. DESCRIPTION OF SYMBOLS 1...Support frame, 7...Cylinder for clamp, 10...Mold, 21...Clamp claw, 24...
...A cylinder for holding the core.

Claims (1)

[Scope of utility model registration request] A vertically movable support frame supports a pair of left and right crank cylinders with their shafts extending horizontally and facing each other, and a clamp arm is attached vertically to the rod end of each clamp cylinder. A clamp claw capable of hooking and holding the core from below is provided at the lower end of the clamp arm, each of the clamp arms has a shaft extending in the vertical direction to support a core holding cylinder, and the core holding cylinder is A core holding device characterized in that a pad capable of pressing the upper surface of the core is attached to the rod end of the cylinder.