JPH0421640Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a device for removing sprues from a casting held in a mold awaiting demolding after pouring.

(Prior art) Recently, with the aim of automating and speeding up casting lines, weir folding tools have been applied to molds that are waiting to be unmolded after pouring, and are used to remove sprues, runners, weirs, etc. from cast products. Various devices have been developed to separate and remove attached parts. Generally speaking, these devices employ one of the following two methods. Namely, one is one that inserts a cutting tool into the mold to cut runners, weirs, etc. (for example, Japanese Patent Publication No. 59-22619).
The other method is to clamp the sprue in the mold and apply downward pressure to cut the sprue and pull it out of the mold (for example,
-14894).

Of these, the former method requires high accuracy in positioning the mold because the cutting tool must accurately contact the numerous runners, weirs, etc. located deep within the mold, and is technically difficult. On the other hand, the latter clamps a sprue that is partially exposed on the mold surface, and usually there are 1 to 2 sprues per mold.
Due to the small number of cases, the technical difficulty is relatively small.

By the way, in conventional equipment that adopts the latter method, after the sprue is clamped, a pressing force is applied to the sprue to separate it from the product part at the runner or weir, and then it is pulled out from the mold. There is. However, in this cutting method, it is necessary to overcome not only the resistance force of the cast product but also the resistance force of the mold, and a considerable amount of force is required. Furthermore, if the pressing force is increased when the cross-sectional area of the runner, weir, etc. is large, the cast product may dance in the mold, making it impossible to reliably separate the parts. If an attempt is made to press the upper surface of the mold with a press plate in order to fix the cast product, an extra force will be required, resulting in an extremely large loss of energy as a whole.

(Purpose of the invention) The present invention was made in view of the above circumstances, and basically relies on a method of clamping the sprue and pulling it out of the mold, and using the minimum amount of energy necessary. Furthermore, the present invention aims to provide a device that can reliably divide the sprue. Another object of the present invention is to provide a device that can minimize the waiting time between processes by quickly discharging the sprue that has been pulled out of the mold.

(Structure of the invention) Hereinafter, the present invention will be explained in detail based on an example. In Figs. 1 and 2, there are 4
A pedestal 4 consisting of a book support 2 and a horizontal member 3 attached to an intermediate portion of the support 2 is installed,
A guide rod 5 is erected at the upper end of each of the columns 2. The upper end of the guide rod 5 supports a fixed table 6, and a cylinder 7 is attached to the upper surface of the fixed table 6 so as to face downward.

Reference numeral 8 designates an upper movable table, and guide tubes 9 are fixed to the four corners of the table 8, and the guide tubes 9 are further slidably fitted into the guide rods 5. A bracket 11 having an inverted concave shape is fixed to approximately the center of the upper movable table 8, and the upper surface of the bracket 11 is further fixed to the tip of the piston rod 12 of the cylinder 7, so that the piston rod 12 The upper movable table 8 is designed to move up and down by the expansion and contraction operations.

13 is a lower movable table;
A guide tube 14 is also fixed to the four corners of the upper movable table 8, and the guide tube 14 is slidably fitted to the guide rod 5 at a position lower than the guide tube 9 of the upper movable table 8. ing. An upward cylinder 15 is attached to both left and right ends of the upper surface of the lower movable table 13.
The upper end of the piston rod 16 is fixed to the lower surface of the upper movable table 8 via a bracket 17. As a result, both tables 8 and 13 are simultaneously raised and lowered by the expansion and contraction operation of the piston rod 12 of the cylinder 7, and The distance between the two tables 8 and 13 is designed to expand and contract by the expansion and contraction of the piston rod 16 of the cylinder 15.

Reference numeral 18 denotes a sprue clamp mechanism, and to explain its structure now, a cylinder 19 is suspended downward from the bottom surface of the bracket 11 via a bracket 21, and a piston rod 2 of the cylinder 19 is suspended downward from the bottom surface of the bracket 11.
An adjustment bracket 23 is attached to the tip of the rod 22 so that the length of the rod 22 can be adjusted. Further, a support bracket 25 for a claw member 24, which will be described later, is provided vertically from approximately the center of the lower surface of the upper movable table 8. At the distal end of the support bracket 25, joints of a pair of toggle links 26 are rotatably connected and supported via pins 27, and at the distal end of the adjustment bracket 23, a pair of toggle links 26 are also supported.
8 joints are rotatably connected and supported via pins 29, and both toggle links 26, 28
One tip of each of the toggle links 26 and 28 is rotatably connected to the corresponding tip of the other via a pin 31, so that the toggle links 26 and 28 form a pantograph-like quadrilateral. .

A pawl member 24 is fixed to each side of the toggle link 26. A long hole 32 in the vertical direction is bored through the support bracket 25, and a pin is connected to the tip of the adjustment bracket 23 so as to be rotatable with the joint of the toggle link 28. A roller 33 is loosely fitted, and when the piston rod 22 of the cylinder 19 is expanded or retracted, the adjustment bracket 23 is guided by the roller 33 and the elongated hole 32 and can be raised and lowered almost vertically. and the piston rod 22
When the piston rod 22 is extended, the claw member 24 is closed, and when the piston rod 22 is retracted, the claw member 24 is closed.
is designed to open.

Note that the width of the elongated hole 32 is made considerably larger than the diameter of the roller 33, but this is to cope with the case where the position of the sprue varies slightly depending on the mold.

A mold holding member 34 is fixed to the lower surface of the lower movable table 13, and openings through which the claw members 24 can pass are vertically formed in the table 13 and the holding member 34.

On the horizontal member 3 of the pedestal 4, a roller conveyor 36 is arranged horizontally in the front-rear direction for conveying the filled mold with frame 35 from the pouring station to the frame disassembling station. Note that 40 is a sprue for the cast product held within the mold 35.

Reference numeral 37 denotes a mold support stand disposed below the roller conveyor 36, and the base end of the support stand 37 is rotatable vertically on a bearing 38 attached to the pedestal 4, using the bearing 38 as a fulcrum. is supported by The tip of the mold support 37 can be moved up and down by a toggle mechanism 42 consisting of a pair of toggle links 39 and a cylinder 41.
When the piston rod 43 of the cylinder 41 is extended, the upper surface of the mold support 37 passes between the tracks of the roller conveyor 36 and rises slightly above the level of the conveyor 36.

Note that 43' is a stopper of the toggle mechanism 42.

A hopper (not shown) is provided below the base 1 and located directly below the pedestal 4, and the lower end opening of the hopper faces the top surface of the spilled sand conveying device (also not shown).

A pair of rails 45 are provided on the sides of the pedestal 4, one end of which is supported by the pedestal 4, and the other end supported by a support 44 erected on the base 1.
is disposed perpendicular to the roller conveyor 36, and the portion of the rail 45 closer to the pedestal 4 is held horizontally at a slightly higher position than the mold 35 conveyed on the roller conveyor 36. At the same time, the portion opposite to the pedestal 4 is descending in an arc. On the rail 45 is a sprue dumping cart 46.
is mounted so as to be freely movable via rollers 47. The bottom surface of the truck 46 is rotatably pin-coupled via a bracket 48 to the tip of a piston rod 51 of a cylinder 49 whose base end is rotatably pin-coupled to the base 1. ,
The carriage 46 moves on the rail 45 to the left in FIG.
The piston rod 51 is moved to the right by the retraction operation of the piston rod 51.
It is designed to tilt at a predetermined angle at the moving end. Note that a sprue carrying device (not shown) is disposed below the truck 46 in the inclined state.

(Function) To explain the process of removing the sprue from the cast product in the poured mold using the device configured as above, the cylinders 7, 15, 19, 41, and 49 are now retracted. Then, the filled mold 35 with a frame is carried from the pouring station via the roller conveyor 36 to a position directly above the mold support 37.
Here, when the piston rod 43 of the cylinder 41 is extended and the mold support stand 37 is raised, the mold 35 is moved onto the roller conveyor 3 by the support stand 37.
It can be lifted slightly by 6 or so. Next, the piston rod 12 of the cylinder 7 is extended and the upper movable table 8 and the lower movable table 13 are lowered simultaneously, and the presser member 34 is brought into contact with the upper surface of the mold 35. After the contact, the pressure in the cylinder 7 is released, and therefore the pressure applied to the mold 35 is only the weight of the upper and lower movable tables 8 and 13. When the piston rod 22 of the cylinder 19 is extended in this state, the claw member 24 penetrates the lower movable table 13 and the opening of the mold holding member 34, and excavates the sand on the upper surface of the mold 35 while opening the head of the sprue 40. Clamp. Thereafter, when the piston rod 16 of the cylinder 15 is extended, the piston rod 16 moves through the upper movable table 8 to the claw member 24.
At the same time as the mold 35 is pulled up, the presser member 34 presses the upper surface of the mold 35 via the lower movable table 13 due to the reaction force. The moments of forces in opposite directions separate the sprue 40 from the casting and pull it out of the mold 35. Note that when the sprue 40 is divided and pulled out, a part of the mold 35 collapses and spills sand, but the spilled sand passes through a hopper (not shown) below the base 1 and is transferred to a spilled sand conveyor (not shown). (not shown) is ejected from the aircraft. Next, when the piston rod 12 of the cylinder 7 is retracted, the upper movable table 8 and the lower movable table 13 simultaneously rise to a predetermined height position, thereby bringing the mold 35 into contact with the presser member 34. At the same time, a predetermined gap is formed between the two. When the piston rod 43 of the cylinder 41 is further retracted, the mold support 37 is lowered and the mold 35 is
is returned and placed on the roller conveyor 36.
At the same time, the piston rod 51 of the cylinder 49
The sprue dumping cart 46 is moved to the left by being extended, and approximately half of its upper surface is passed between the mold 35 and the holding member 34, and positioned below the sprue 40 clamped to the claw member 24.

Next, the piston rod 16 of the cylinder 15 is retracted to raise the lower movable table 13 independently, and the distance between it and the upper movable table 8 is returned to the starting state. At the same time, when the piston rod 22 of the cylinder 19 is retracted and the claw member 24 is opened, the sprue 40 that was clamped to the claw member 24 is opened.
falls onto the sprue dumping cart 46. Thereafter, when the piston rod 51 of the cylinder 49 is retracted, the truck 46 moves to the right and moves onto the rail 45.
The sprue 40 on the carriage 46 is sloped at the end so that the sprue 40 on the carriage 46
falls onto a sprue discharge device (not shown).

The above operations are treated as one process, and the same process is repeated thereafter.

(Effect of the invention) As is clear from the above explanation, when removing the sprue from the cast product in the poured mold of the invention,
An upper movable table equipped with a sprue clamping mechanism and a lower movable table equipped with a mold holding member are vertically connected via a cylinder, and the sprue clamping mechanism clamps the head of the sprue and simultaneously holds the mold pressing member. The piston rod of the cylinder is brought into contact with the mold, and the piston rod of the cylinder is extended to apply force moments in opposite directions to both tables, thereby separating the sprue from the cast product and pulling it out from the mold. be.

According to the present invention, compared to the conventional device that inserts a cutting tool into the mold to cut the runner, weir, etc., high precision is not required for positioning the mold, and the sprue can be opened with a simple mechanism. Can be removed.

In addition, compared to conventional equipment that clamps the sprue and pulls it out of the mold, the present invention separates the sprue from the cast product using a tensile force, so there is almost no resistance from the mold, and it can be used to achieve the desired purpose with a relatively small force. can be achieved. Furthermore, since the mold is held down by the reaction force of the force that pulls the sprue, there is no need for a separate output to hold down the mold, and the sprue can be removed reliably with the minimum amount of energy required.

Furthermore, in this invention, the pulled out sprue is received by a traveling trolley and carried out of the machine, and the sprue clamp mechanism only moves up and down, so the waiting time between processes is minimized. This will shorten the time and improve work efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a front view and FIG. 2 being an enlarged view of the sprue clamping mechanism in FIG. 1. 8...Upper movable table, 13...Lower movable table, 15, 19...Cylinder, 18...Gate clamp mechanism, 24...Claw member, 25...Support bracket, 26, 28...Toggle link, 34...
... Mold holding member, 35 ... Mold, 36 ... Roller conveyor, 37 ... Mold support stand, 40 ... Sprue,
46... Sprue dumping trolley.

Claims (1)

[Scope of utility model registration request] An upper movable table 8 on which a sprue clamping mechanism 18 for a poured mold 35 is suspended is arranged to be movable up and down,
Below the upper movable table 8, a lower movable table 13 having a mold pressing member 34 on its lower surface is connected via a cylinder 15, and below the lower movable table 13, a conveying device 36 for the mold 35 is installed in a horizontal direction. A mold support 37 is disposed below the conveyance device 36 and is movable up and down through the conveyance device 36, with one of its movable ends being located below the sprue clamping mechanism 18. , a sprue dumping cart 46 adapted to tilt at the other of its moving ends.
A device for drawing out a sprue from a poured mold, characterized in that the following are disposed so as to be freely traversely perpendicular to the trajectory of the mold conveying device 36.