JPS6239879Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a frame matching device for upper and lower flasks in a mold making line in which upper flasks and lower flasks are alternately molded.

The upper and lower flasks, which are alternately filled into molds by one molding machine, are arranged alternately and conveyed by one conveyor, and the upper flask is turned over by a reversing machine installed in the middle, and then the flasks are further molded. The upper and lower flasks are combined by a matching device and used for pouring, but this type of flask matching device uses an air cylinder or a hydraulic cylinder to combine the upper flask that has been conveyed on a conveyor. Clamp and lift with a lifting clamp device,
A common method is to lower the upper frame onto the following lower frame to align the frames.

By the way, if you apply a shock to the flask when fitting the flask,
Problems such as the mold in the flask chipping and molding sand sticking to the surface of the product (sand trapping), or the upper mold pushing the lower mold too much causing errors in product dimensions (pushing) Occur.

Conventionally, in order to prevent such troubles, measures have been taken to incorporate a deceleration valve into the piping system of the cylinder to reduce the descending speed of the upper flask immediately before the upper and lower flasks come into contact with each other.

However, the cylinder type always involves some pressure fluctuations, which causes variations in the operation of the reduction valve. As a result, the frames were sometimes aligned without sufficiently slowing down the lowering speed of the upper frame.

The occurrence of defective products due to such troubles during frame alignment is increasing as the manufacturing speed increases.

The present invention was developed in view of the above circumstances, focusing on the fact that the speed of movement can be reduced by changing rotational motion to reciprocating motion, and developed a device that can align flasks without applying impact to the flasks. This is what we intend to provide.

The present invention will be explained in detail below with reference to figures. In FIG. 1, a roller conveyor 3 is provided to alternately line up and convey upper frames 1 and lower frames 2 that have been molded by a molding machine (not shown). At the same time, a pedestal 4 is erected across the conveyor 3. A speed reducer 5 is mounted on the pedestal 4, and one end of the rotating shaft of the speed reducer 5 is connected via a coupling 6 to the rotating shaft of a motor 7, which is also mounted on the pedestal 4. At the same time, a rotating arm 8 is attached to the other end of the rotating shaft of the reducer 5 so as to be vertically rotatable.

One end of a connecting rod 9 is rotatably supported at the tip of the rotating arm 8, and the other end of the connecting rod 9 connects to a downward lifting cylinder 10 disposed below the pedestal 4. The cylinder 10 is rotatably connected via a bracket 11 fixed to the back surface thereof.

At the tip of the rod 12 of the lifting cylinder 10, an upper frame clamp device 16 consisting of a support frame 13 and a clamp 15 that is suspended from the lower surface of the support frame 13 and can be opened and closed by a clamp cylinder 14 is fixedly installed. and the clamping device 16
The guide rods 17, 17a, each of which has one end fixed to the upper surface of the support frame 13, are slidably fitted into a guide cylinder 18 fixed to the pedestal 4, thereby making it possible to move up and down vertically.

The rod 12 of the lifting cylinder 10 is arranged so that when the tip of the rotary arm 8 is rotated to the lowest position and the stroke of the cylinder 10 is maximized, the clamping device 16 is placed on the conveyor 3. Its length is adjusted so that the frame 1 can be clamped.

Furthermore, when the tip of the rotary arm 8 is rotated to the lowest position and the stroke of the lifting cylinder 10 is minimized, the connecting rod 9 is connected to the lower surface of the upper frame 1 clamped by the clamping device 16; Its length is adjusted so that the upper surface of the lower frame 2 placed on the conveyor 3 comes into contact with the upper surface of the lower frame 2 .

In the apparatus configured as described above, the upper frame 1 and the lower frame 2 molded by a molding machine (not shown) are alternately arranged and conveyed on the roller conveyor 3 to the bottom of the pedestal 4. Note that the upper frame 1 has been previously reversed by a reversing machine (not shown).

When the upper frame 1 is guided directly below the upper frame clamping device 16, actuating the motor 7 on the pedestal 4;
When the rotary arm 8 is rotated downward, the upper frame clamp device 16 is lowered. When the tip of the arm 8 has rotated to the lowest position, the rotation of the arm 8 is stopped and the rod 12 of the lifting cylinder 10 is extended to the maximum extent, and the clamping device 16 is further lowered. Here, the clamp cylinder 14 is operated to close the clamp 15 and the upper frame 1 is clamped. Next, the motor 7 is operated again to rotate the arm 8 so that its tip reaches the uppermost position, and the rod 12 of the lifting cylinder 10 is shortened. As a result, the upper frame 1 is lifted up.

Furthermore, when the lower frame 2 is guided directly below the upper frame 1 clamped by the upper frame clamping device 16, when the arm 8 is rotated downward, the upper frame 1 is lowered. When the tip of the arm 8 has rotated to the lowest position, the rotation of the arm 8 is stopped, the clamp cylinder 14 is operated to open the clamp 15, and the upper frame 1 is separated from the clamp device 16.
This completes the frame alignment of the upper and lower flasks, and the pair of flasks 1 and 2 that have been aligned in this way are transported to the pouring process, and the new upper frame 1 is transferred to the conveyor 3.
The upper part is conveyed to the bottom of the frame 4. The above work is considered as one process, and the same process is repeated thereafter.

As is clear from the above description, in the present invention, the upper frame clamping device 16 is raised and lowered by the lifting cylinder 10 and the rotating arm 8, and especially when lowering the upper frame 1 onto the lower frame 2 for frame alignment. This is done exclusively by rotating the rotary arm 8.

Now, the relationship between the rotational movement of the rotary arm 8 and the vertical movement of the upper frame clamping device 16 can be expressed mathematically as follows.

That is, D=√ ² − ^{2 2} + γ(1−cos
α)-l However, D: Lifting distance of the upper frame clamping device 16 α: Rotation angle of the rotating arm 8 γ: Length of the rotating arm 8 l: Length of the connecting rod 9 Furthermore, if the above relational expression is shown in a graph, the second It will look like the figure.

That is, when the rotation speed of the rotating arm 8 is constant, the descending speed of the clamp device 16 is slow while the rotation angle of the arm 8 is small, increases in speed when the rotation angle is around 90 degrees, and slows down again as the rotation angle approaches 180 degrees. do.

Therefore, when aligning the upper and lower flasks, the lowering speed of the upper frame 1 clamped by the upper frame clamping device 16 is as follows:
The speed is reduced as it approaches the lower frame 2, allowing for shock-free frame alignment. Moreover, the rotating arm 8 is driven by the motor 7.
Since the clamp device 16 is driven by and rotates at a constant speed, the clamp device 16 that is interlocked with the clamp device 16 also moves up and down in a constant cycle. In other words, good and stable frame alignment work is guaranteed at all times, and even when the molding speed increases, problems such as sand jamming and pressing do not occur.

The present invention, which exhibits the above-mentioned excellent effects, will greatly contribute to the further development of this industry.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention, and FIG. 2 is a graph showing the correlation between the rotational movement of the rotary arm and the vertical movement of the upper frame clamping device. 1: Upper frame, 2: Lower frame, 3: Roller conveyor,
4: Frame, 5: Reducer, 8: Rotating arm, 9: Connecting rod, 10: Lifting cylinder, 16: Upper frame clamp device, 17, 17a: Guide rod, 18: Guide tube.

Claims (1)

[Scope of utility model registration request] A pedestal 4 is erected above the conveyor 3 that alternately conveys the upper and lower flasks 1 and 2, and a rotary arm 8 driven by a motor via a reducer 5 is disposed on the pedestal 4 so as to be vertically rotatable. At the tip of the arm 8, the pedestal 4 is attached.
The upper end of the connecting rod 9 is rotatably connected to the lower end of the connecting rod 9, which is movable up and down and adjusted to an appropriate length.
0 is rotatably suspended, and an upper frame clamping device 16 is fixed to the tip of a rod 12 of the cylinder 10.