JPS6239882Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a device for raising and lowering a casting flask. In order to transfer the flask to a line with a different height, it is necessary to raise and lower the flask, and conventionally, an upward cylinder is generally used to raise and lower the flask. On the other hand, casting flasks with built-in molds are quite heavy, so even though the lifting distance is short,
The cylinder must have a large diameter;
There have been problems in that the pressure fluid generator for supplying pressure fluid to the cylinder is large and expensive.

The present invention was devised to solve the above-mentioned problems, and an object of the present invention is to provide a flask lifting and lowering device that can accurately lift and lower a flask even with a cylinder having a smaller diameter than conventional cylinders. Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

Reference numerals 1 and 2 designate roller conveyors with flanges for transporting flasks 3, which are adjacent to each other orthogonally at one end and are installed via supports. The transfer level of the flange roller conveyor 2 is slightly higher than that of the flange roller conveyor 1. Further, a base 4 is installed inside the flange roller conveyor 1 at a position corresponding to the flange roller conveyor 2, and brackets 5 and 6 are fixed on the left and right sides of the base 4. The bracket 5 has the lower end of the link 7, and the bracket 6 has the lower ends of two links 8 and 9 having the same length as the link 7.
They are supported via support pins 10 and 11 so as to be vertically rotatable left and right, respectively. And link 7,
Between 8 and 9, there are piston rods 12 and 13 on both sides.
and the piston rods 12, 13
A horizontal cylinder 14 whose entire length is the same as the distance between the support pins 10 and 11 is connected to the tip of the piston rod 12 to the link 7 via a joint pin 15 and to the cylinder 14 via a joint pin 16.
The right end of the main body of the piston rod 13 is connected to a link 8, and the upper end of the link 9 is connected to the tip of the piston rod 13 via a joint pin 17. Also, the joint pins 15, 16, 17 are provided with links 18, 19, 2 having the same length as the link 7.
The lower ends of the links 18 and 19, 20 are connected to each other so as to be vertically rotatable, and an elevating table 25 is mounted between the upper ends of the links 18, 19, 20 via brackets 21, 22 and joint pins 23, 24. ing. On the upper surface of the lifting table 25, a large number of flange rollers 26, 26 are provided with the same transfer width as the flange rollers of the flange roller conveyor 2.
It is pivoted via 7 and 27. When the piston rod 12 of the cylinder 14 is retracted the most, the internal angle formed by each set of links 7, 18, 8, 19 and 9, 20 is 90 degrees or more.

Next, the operation of the device configured as described above will be explained. When the flask 3 is transferred on the flanged roller conveyor 1 in the direction of the arrow and stops at a position directly above the lifting table 25, the piston rod 12 of the cylinder 14 is extended. Then, the links 7 and 18 and the links 8 and 19 are rotated around the joint pins 15 and 16 so as to spread outward, and the elevating table 25 is raised, and the flask 3 is moved to the flanged roller 2.
6, 26 and is pushed up from above the collared roller conveyor 1. In this case, even if the links 8 and 19 do not open due to the extension of the piston rod 12 and only the links 7 and 18 attempt to open, the extension of the piston rod 12 causes the piston rod 13 to retract and the links 9 and 20 to open. It is rotated around the joint pin 17 as a fulcrum so as to spread outward, and as a result, the links 8 and 19 are forcibly opened by the links 9 and 20.
As a result, the links 7 and 18 and the links 8 and 19 are opened in synchronization with each other, and the elevating table 25 rises while maintaining the horizontal state. Also, links 7 and 18
If the angle formed by the links 8 and 19 is 2θ and the output of the cylinder 14 is P, then the upward force F generated on the brackets 21 and 22 is P/2tanθ.

Then, when θ=45 degrees, F=P/2, and F
occurs at two points, brackets 21 and 22, so
An upward force of 2F=P will act on the lifting table 25. Therefore, if the piston rod 12 is configured so that θ is 45 degrees or more when it is retracted, the force F will increase as the piston rod 12 expands, so the diameter of the cylinder 14 will be smaller than that of the conventional upward cylinder. be able to. The flask 3 thus raised is pushed out from the flanged rollers 26, 26 onto the flanged roller conveyor 2 by appropriate means, and the transfer of the flask 3 is completed.

In the above embodiment, a roller conveyor is provided on the elevating table, but the flasks may be transported by a mold truck by fixing the rails.

As explained above, in this invention, the lifting table is raised and lowered by a cylinder equipped with a toggle mechanism, so the diameter of the cylinder for the lifting table is greatly reduced, and the cylinder is equipped with piston rods on both sides. Since the link is also connected to the other piston rod in this structure, excellent practical effects are achieved, such as being able to accurately raise and lower the lifting table while maintaining the horizontal state without providing a guide bar.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being a plan view and FIG. 2 being a partially sectional front view. 1: Roller conveyor with collar, 4: Base, 5;
6: Bracket, 7; 8; 9: Link, 12; 1
3: Piston rod, 14: Cylinder, 15; 1
6; 17; Joint pin, 18; 19; 20: Link, 21; 22: Bracket, 23; 24: Joint pin, 25: Elevating table.

Claims (1)

[Scope of utility model registration request] A base 4 is installed at a required position of the flask transfer device, and two brackets 5 and 6 are fixed on the base 4 at a required interval, and one bracket 5 has a lower end of a link 7. and the other bracket 6 has two links 8 having the same length as the link 7,
The lower ends of 9 are supported vertically rotatably,
Between the links 7, 8 and 9 is a cylinder 14 which is provided with piston rods 12 and 13 on both sides and whose total length is the same as the distance between the brackets 5 and 6.
One piston rod 12 is connected to the upper end of the link 7 via the joint pin 15, and the main body of the cylinder 14 is connected to the upper end of the link 8 through the joint pin 16, and the other piston rod 13 is connected to the upper end of the link 7 through the joint pin 16. The joint pin 15,
The lower ends of links 18, 19, 20 having the same length as the link 7 are vertically rotatably connected to the links 16, 17, and brackets 21, 22 are connected between the upper ends of the links 18, 19, 20. A flask lifting device characterized in that a lifting table 25 is mounted via joint pins 23 and 24.