JPH049079Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in a casting sand removal device that crushes and removes core sand from a casting using a shock wave based on underwater discharge.

[Prior art] In the casting sand removal device disclosed in Japanese Patent Publication No. 55-18432, after the casting is carried into a fixed stand above the fixed water tank, the movable water tank is pulled up from inside the fixed water tank, and the fixed water tank is removed. After sealing the area, compressed air is pumped in to raise the water level in the fixed tank to the movable tank, thereby submerging the casting. With this device, it is easy to carry castings to the fixed table and position the electrodes, and it is easy to see, so it is advantageous for extremely large castings, but it also protects the sliding parts between the fixed water tank and the movable water tank from vibrations. It cannot be said to be economical in terms of the seal structure and the repeated use of compressed air.

In the case of medium-sized castings, the prior application of the present application, JP-A-57
-As disclosed in Publication No. 205025, the lifting frame that supports the casting is submerged in a water tank, and the lifting frame is placed vertically, horizontally, and
It is easier and more efficient to insert/remove the casting into and out of the water tank and to control the electrode if the electric discharge is caused between the casting and the electrode supported so as to be movable back and forth.

However, if the casting has a complex structure, weakening the discharge capacity may leave the core sand without being completely crushed. Therefore, when the discharge capacity is increased, the impact force acting on the casting causes the casting to flop around on the support table, causing not only cracks in the casting, but also changes in the relative position between the casting and the electrode, and the subsequent impact force due to intermittent discharge. is not applied evenly to each part of the casting.

[Problems to be Solved by the Invention] In view of the above-mentioned problems, the purpose of the invention is to provide a device for removing sand from castings that effectively suppresses the looseness of castings caused by underwater discharge and prevents cracking of castings. .

[Means for Solving the Problem] For this reason, the configuration of the present invention is to support an elevating frame movable from above the aquarium to the inside of the aquarium on a base frame placed adjacent to the aquarium, and to protrude from the elevating frame to a cast support base. A trolley for supporting the electrodes was supported on the top of the lifting frame so as to be movable back and forth, and left and right, and a lattice-shaped buffer frame was supported on the lifting frame, which was movable between a position on top of the casting and a position retracted from the top of the casting. It is something.

[Operation] The electrode 21 of the electrode support cart 23 is positioned at a predetermined position with respect to the casting 30 fed into the casting support stand 26 when the lifting frame 19 is in the raised position. Lifting frame 1
The casting 30 is submerged in the water tank 16 at the lowered position 9,
An impact is applied to the casting 30 by the underwater discharge between the electrode 21 and the casting 30, and the core sand of the casting is crushed and removed.

A casting support stand 26 and an electrode support cart 2 are mounted on the lifting frame 19.
3, the electrode 21 is accurately positioned with respect to the casting 30.

Since the lattice-shaped buffer frame 43 supported by the lifting frame 19 is placed on the casting 30, the casting 30 is prevented from moving loosely due to discharge shock, and the casting 30 and the electrode 2 are
1 misalignment is prevented.

[Embodiment of the invention] FIG. 1 is a plan view showing a transfer system for castings 30 to a sand removal device 7 according to the invention. Tray 3
A plurality of parallel partition walls are provided on the upper surface, and castings 30, such as cylinder heads of an internal combustion engine, are inserted one by one between the partition walls by a pusher 2. The tray 3 is sent in the direction of the arrow by the conveyor 4, transferred to the conveyor 5, and inserted into the cooling tank 6. After cooling, it is taken out from the cooling tank 6, placed on the conveyor 5 again, and sent to the sand removal device 7.

The core sand of the casting 30 is crushed by the sand removing device 7,
After the sand is removed, it is sent to the conveyor 12.
On the way, the castings 30 in the tray 3 are subjected to rust prevention treatment in a rust prevention tank 10, and are turned over in a turning machine 11. Tray 3
is transferred from the conveyor 12 to the conveyor 13, and only the casting 30 is pushed out from the pusher 14 to the conveyor 15. The tray 3 is returned from the conveyor 13 to the conveyor 4 via a conveyor (not shown). The conveyors 5 and 12 are arranged in a straight line across the sand removal device 7, and a relay conveyor 35 is arranged between them.

The sand removing device 7 includes a relay conveyor 35 that is aligned with the conveyors 5 and 12, a water tank 16, and a power supply unit 8. As shown in FIGS. 2 and 3, a base frame 18 including four pillars erected outside the water tank 16
An elevating frame 19 is supported by the elevating frame 19, and is raised and lowered via a rope 25 by the expansion and contraction operations of a pair of hydraulic actuators 17 (one not shown). A slatted cast support 26 is formed at the bottom of the lifting frame 19.

As shown in FIG. 4, a traveling carriage 23 is supported by a guide rail 31 connected to the top of the elevating frame 19.
It is reciprocated by a hydraulic actuator 24. A traversing truck 33 is supported by guide rails 32 of the traveling truck 23 and reciprocated by a hydraulic actuator 34 . The electrode 21 (FIG. 2) is supported on the traversing truck 33 so as to be movable up and down by a pair of hydraulic actuators 22.

As shown in FIG. 3, a lattice-shaped buffer frame 4 made of a relatively heavy insulator is movable between a position above the casting 30 and a position retracted from above the casting 30.
3 is arranged on the elevating frame 19. The buffer frame 43 is tiltably supported on the lifting frame 19 by a shaft 41, and the buffer frame 43 is moved to the casting 30 by a hydraulic actuator 42.
The tray 3 is driven from the state where it is placed on the upper side to the state where it is upside down and retreated to the side of the lifting frame 19, and the tray 3 is moved onto the conveyor 5.
The structure is such that there is no problem when feeding the product from the elevator frame 19 to the elevator frame 19 or from the elevator frame 19 to the conveyor 12.

As shown in FIG. 5, the relay conveyor 35 includes rollers 3 that roll along guide rails 28 of the base frame 18.
A large number of rollers 38 are supported on the upper side of a frame 36 having a frame 36, and an endless drive chain 39 is stretched between a chain wheel connected to each roller 38 and a chain wheel supported on the frame 36. The guide rail 28 is arranged below the ends of the conveyors 5,12.

As shown in FIG. 2, a casting 30 in a water tank 16 grounded by a fixed electrode 40 and a movable electrode 21
Although high-pressure discharge is performed intermittently during this period, such a configuration is well known and is not directly related to the gist of the present invention, so a description thereof will be omitted.

Next, the operation of the device of the present invention will be explained. FIG. 2 shows a state in which the tray 3 loaded with castings 30 is placed on the casting support 26 of the lifting frame 19 and inserted into the water tank 16. At this time, the elevating frame 19 is supported on a stop member 20 fixed to the water tank side. When a high-pressure underwater discharge is performed between the electrode 21 and the grounded casting 30, the core sand of the casting 30 is crushed by the shock wave and sinks to the bottom of the water tank 16. The two electrodes 21 are separated from the casting 30 by an appropriate distance (approximately 80
mm), the upper side of the casting 30 on the tray 3 is moved in a predetermined pattern by a combination of the movement of the traveling cart 23 in the direction of the arrow x and the movement of the traversing cart 33 in the direction of the arrow y. discharge.

When the core sand has been removed from all of the castings 30 in the tray 3, the traveling carriage 23 and the traversing carriage 33 return to their initial positions, and the hydraulic actuator 22 pulls up the electrode 21.

Next, the lift frame 19 is pulled up by the hydraulic actuator 17, and the bottom part is connected to the conveyors 5, 1.
It stops once it reaches a position slightly higher than the second plane. The relay conveyor 35 moves to the lower side of the elevating frame 19 along the guide rail 28. Lifting frame 1
When the tray 9 is slightly lowered, the roller 38 of the relay conveyor 35 hits the bottom surface of the tray 3 through the elongated slatted opening of the casting support 26 of the lifting frame 19. The rollers 38 of the relay conveyor 35 are driven to rotate, and the tray 3 is delivered to the conveyor 12.

The casting 30 placed on the tray 3 is inserted into the rust prevention tank 10 and subjected to rust prevention treatment. Then,
The processing liquid is completely discharged by the reversing machine 11, and the tray 3
is transferred to the conveyor 13. The casting 30 is sent from the conveyor 13 to the conveyor 15 by a pusher 14, and the tray 3 is returned from the conveyor 13 to the conveyor 4 via a not-shown conveyor.

The tray 3 loaded with the castings 30 by the pusher 2 is transferred from the conveyor 4 to the conveyor 5, where it is inserted into the cooling tank 6. Water tank 1 of sand removal device 7
The casting 30 is cooled in advance so that the temperature change in step 6 does not affect the discharge effect. A relay conveyor 35 in which the tray 3 is separated from the conveyor 5 and the rollers 38 protrude upward from the bottom surface of the lifting frame 19.
When the tray 3 is moved to, the lifting frame 19 is slightly pulled up by the hydraulic actuator 17, and the tray 3 is moved to the casting support base 26 of the lifting frame 19. The relay conveyor 35 is retracted laterally from below the elevator frame 19 along the guide rail 28.

The lifting frame 19 is lowered to the stop member 20 by the hydraulic actuator 17, and the tray 3 is inserted into the water tank 16. Axis 4 by actuator 42
The buffer frame 43 is brought down centering around 1 and placed on top of the casting 30. As described above, the electrode 21 is lowered to a predetermined height with respect to the casting 30, and as the traveling carriage 23 and the traversing carriage 33 move in the x and y directions of the arrows, the casting 30 is impacted by intermittent electrical discharge. . The impact force applied to the casting 30 is
The distance between the electrode 21 and the electrode 21 is adjusted. but,
If the shape of the casting 30 is complex, the core sand will not be completely crushed if the impact force is weak.

In the present invention, even if the impact force is strong, the comparatively heavy lattice-shaped buffer frame 43 is placed on the upper side of the casting 30, so that the casting 30 is suppressed from swinging out due to the impact, and accidents such as cracking of the casting 30 are avoided. Ru.
In addition, since the casting 30 is held at a predetermined position on the casting support 26, there is no change in the relative position between the casting 30 and the electrode 21, and the subsequent movement of the electrode 21 and intermittent discharge uniformly spread to each part of the casting 31. An impact is applied to completely remove the core sand from each part of the casting 30. Since the buffer frame 43 has insulating properties, the electrode 21
Since it is simply placed on top of the casting 30 without interfering with the discharge effect between the metal and the casting 30, an unreasonable load is not applied to the mounting part of the lifting frame 19 against the discharge shock, and durability is ensured. Ru.

[Effects of the invention] As described above, the present invention supports an elevating frame that is movable from the top of the aquarium into the interior of the aquarium on a base frame placed adjacent to the aquarium, and supports electrodes that protrude to the casting support of the elevating frame. A dolly is supported on the top of the lifting frame so as to be movable back and forth, left and right, and a lattice-shaped buffer frame is supported on the lifting frame, which is movable between a position on top of the casting and a position retracted from the top of the casting. The above configuration provides the following effects.

(a) It is easy to position the electrode relative to the casting;
By simply lowering the lifting frame, the casting is immersed into the water tank, with the casting precisely aligned with the electrodes.

(b) Since the buffer frame provided in the lifting frame is placed on top of the casting, the casting is prevented from moving loosely due to electrical discharge, and damage to the casting is prevented.

(c) Since there is no displacement of the casting on the casting support and the relative position between the casting and the electrode is maintained, the movement of the electrode and intermittent discharge can sequentially and uniformly apply a discharge shock to each part of the casting. , the foundry core sand is completely removed.

(d) There is no need to seal the water tank or use compressed air to adjust the water level, there are no parts that require special sealing means, the structure is simple, and equipment and operating costs are lower than conventional methods. This results in significant savings.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a schematic configuration of a device for removing sand from castings according to the present invention, Fig. 2 is a front sectional view of the device, Fig. 3 is a side sectional view of the device, and Fig. 4 is a view of the elevator frame. The plan view and FIG. 5 are front sectional views of the relay conveyor. 3... Tray, 5... Conveyor, 7... Sand removal device, 16... Water tank, 17... Hydraulic actuator, 18... Base frame, 19... Lifting frame, 22... Hydraulic actuator, 23... ...Traveling trolley, 24...
Hydraulic actuator, 28... Guide rail, 30
... Casting, 33 ... Traverse truck, 34 ... Hydraulic pressure actuator, 35 ... Relay conveyor, 42 ... Hydraulic pressure actuator, 43 ... Buffer frame.

Claims (1)

[Scope of utility model registration request] An elevating frame that can be moved from the top of the aquarium into the interior is supported on a base frame placed adjacent to the water tank, and a cart that supports the electrodes that protrude to the casting support of the elevating frame can be moved back and forth, left and right, to the top of the elevating frame. 1. A device for removing sand from a casting, characterized in that a lattice-shaped buffer frame is supported on the lifting frame and is movable between a position on top of the casting and a position retracted from the top of the casting.