JPH0223264B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electro-hydraulic cleaning device for castings related to the production of castings, and more specifically, equipment for electro-hydraulic cleaning of residual mold parts of castings; In particular, it relates to equipment for demolding cores, and can be used in factories that continuously and mass produce the castings of the present invention.

Pneumatic vibration equipment and (electrohydraulic) equipment that utilizes the energy of high voltage discharges in liquids are widely used to clean castings and break out cores. The latter type of equipment, compared to conventional pneumatic vibrator equipment,
There is no dust generation associated with dry cleaning methods, no vibrations and high levels of noise harmful to workers, the ability to break cores of any strength, and automation and mechanization of the cleaning process. There are a number of advantages such as the possibility of introducing

The main condition that electrical equipment must meet for cleaning castings in mass production conditions is that these equipment ensure effective and high-quality cleaning of castings with a minimum of human intervention. be. Furthermore, the equipment must be able to be easily integrated into existing production lines and ensure high performance, reliability and ease of operation.

Electrohydraulic cleaning equipment for castings is well known;
(see, for example, USSR Inventor's Certificate No. 406413), the installation consists of a cast-iron platform comprising a tank with a working fluid and two platforms with a carriage movable by driving a rope along an inclined guideway. It has a device for sending the water into the tank.
In the uppermost position, this feeding device allows the platform to reach one loading station and in the lowermost position to reach two processing stations. Furthermore, the equipment is equipped with an independent mechanism for moving the electrodes, which are electrically connected to the current pulse generator.

Because of this construction of the equipment, the castings can only be cleaned after they have been removed from the hangers of the transport conveyor and placed on the load table, after which the cleaned castings can be removed from the load table onto the hangers. suspended to. Generally speaking, casting removal and suspension operations require manual labor. In addition, the independent electrode actuation mechanism complicates the structure of the equipment and makes maintenance of the electrodes cumbersome. This is because the mechanism reciprocates the electrode in a horizontal plane but does not draw from the working fluid. However, for inspection and maintenance it is necessary to disconnect the electrode from the mechanism and draw it out from the working fluid.

On the other hand, the tank is a tank containing a working fluid containing at least one electrode connected to a current pulse generator, and the tank is a tank installed under the track of an overhead push-type conveyor for conveying castings. Also known are electrohydraulic cleaning installations for castings having a device for feeding castings into a bath, comprising a pivoting frame connected to a frame structure and provided with a casting holding device including a driven arm. (see, for example, USSR Inventor's Certificate No. 396174).
In this installation, the pivot frame is connected to the frame structure by a pivot that allows it to rotate about a horizontal axis. The pivot frame is additionally provided with contact members that engage the casting when the casting is removed from the hanger of the overhead push type conveyor and retained by the driven arm mounted on the movable frame. There is.

According to the construction of this equipment, the castings are cleaned by removing them from the hangers of an overhead push-type conveyor by means of a driven arm and feeding them by means of a pivoting frame into a tank containing the working fluid. It becomes possible only after Said driven arm, however, complicates the construction of the pivot frame and cannot be used to remove castings from hangers from which many castings are suspended on overhead push-type conveyors; Cleaning several castings at the same time in a facility is not possible on bulk conveyors in automotive foundries where each hanger is expected to hold several castings.

Furthermore, in the above-mentioned equipment, the reciprocating movement of the electrodes is performed by an independent mechanism, which makes the equipment complex and difficult to maintain. This is because the main elements of the electrode operate directly in the area of high-voltage discharge and are exposed to electrical and mechanical loads, so it is impossible to visually inspect the condition of this electrode. It is.

In this equipment, it is difficult to visually monitor the position of the electrode relative to the casting because the electrode is moved toward the desired portion of the casting as the casting is submerged in the working fluid.

The basic object of the present invention is to provide an electrohydraulic cleaning device for castings, and in particular, the structure of the device for feeding the castings into a tank containing working fluid is of an overhead push type. To provide a cleaning device which can be cleaned without removing it from a hanger of a conveyor, thereby increasing the productivity of the cleaning device and simplifying its structure.

According to the present invention (numerals given in the embodiments to be described later are added for reference), there is provided an electro-hydraulic cleaning device for castings, in which a working fluid is accommodated. , and has a tank 1 adapted to receive therein at least one electrode 2 connected to a generator 4 of current pulses, which tank 1 is adapted to transport a casting 7 suspended in a hanger 11. The casting machine is mounted on a frame structure 8 below the track 5 of the overhead push type conveyor 6 and includes a movable frame 9 connected to the frame structure 8 and a device for holding the casting 7. 7 into the tank 1, wherein the movable frame 9 is a track section 10 that forms a part of the track 5 and is separable from the track 5; It is fixed to the track section 10 located directly above the tank 1, and the device for feeding the castings into the tank includes the overhead push type conveyor 6, which is moved into the track section 10. It has a mechanism for moving the movable frame 9 in the vertical direction together with the hanger 11 and the casting 7 held by the hanger 11, and the track portion 10 fixed to the movable frame 9 moves along the movable frame 9. is aligned with said track 5 when in the uppermost position, and said casting holding device is rotatably mounted on said movable frame 9 and holds the casting 7 in one fixed position. An electrohydraulic cleaning device for castings is provided, characterized in that it has a gripper 19 adapted to hold.

Conveniently, the electrode is mounted on the gripper.

Conveniently, the gripper is in the form of two bellcranks, each of which is fitted with a cam in one of its arms, which cam is mounted in the uppermost position of the movable frame. It is adapted to mate with the frame structure and, at the lowest position of the frame, with the flange of the tank. The other arm of the bellcrank is provided with a protrusion designed to hold the casting at the lowest position of the frame under the influence of the weight of the frame on which it is placed.

The electrohydraulic cleaning device for castings according to the invention makes it possible to eliminate devices for transferring castings between separate devices. This is because the track section of the overhead push type conveyor is integrally connected to the movable frame of the device for feeding the castings into the tank, and the hanger that suspends the castings, together with the lower part of the movable frame, is connected to the working fluid. This is because they are immersed in a tank containing water. The track section with the load-bearing trolley of the overhead push-type conveyor is located at the top of the movable frame, which remains outside the tank even when the movable frame is in its lowest position. There is. The structure of the cleaning device according to the invention is thus significantly simplified.

The construction of this cleaning device is further simplified by the fact that the electrodes are mounted on the grippers. This is because it is no longer necessary to provide an independent electrode actuation mechanism.

If the gripper adapted to hold the casting is configured in the form of two bell cranks with cams and projections, the casting can be moved by the gravity of the movable frame containing the casting without any additional actuators. The lifting movement of the movable frame can be used to release the casting from the grippers, which further simplifies the construction of the cleaning device. Make it seem possible.

According to the above-described structure of the cleaning device and the simple structure of the gripper for holding the castings, which make it possible to clean the castings without removing them from the hangers of the overhead push-type conveyor, it is possible to It is possible to clean two, four or six castings of the same type suspended on the same hanger of a type conveyor, thus improving the cleaning efficiency of the cleaning device, and the application fields of this cleaning device are: An example of this is a conveyor in a foundry of an automobile factory, where hangers for hanging many castings are used, and it is widely expanded to foundries that mass-produce castings.

The invention will now be explained in connection with embodiments thereof with reference to the drawings.

The electrohydraulic cleaning device for castings embodying the invention has a bath 1 (FIGS. 1 and 2) containing a working fluid, most often industrial water.
The vessel 1 is adapted to receive therein an electrode 2 which is connected via a conductor 3 (FIG. 2) to at least one electrical generator 4 which generates current pulses. The tank 1 is connected to a track 5 of an overhead push type conveyor 6 for carrying the castings 7 (FIG. 1).
It is mounted so that it is located below.

The cleaning device furthermore has a device for feeding the casting 7 into the bath 1, which includes a movable frame 9 (FIGS. 1 and 2) connected to a frame structure 8. Note that the movable frame 9 is equipped with a device for holding the casting 7. The movable frame 9 is fixed to a track section 10 (FIG. 1) of the track 5 of the overhead push type conveyor 6, which is located directly above the tank 1.

The device for feeding the casting 7 into the tank 1 is a hanger 11 of an overhead push type conveyor 6.
and a mechanism for vertically displacing the movable frame 9 and the casting 7 on the hanger, which mechanism moves the track section 10 when the movable frame 9 carrying the track section 10 is in the uppermost position. 10 and the orbit 5 other than the orbit portion 10 are aligned. In this embodiment, the mechanism for vertically moving the movable frame 9 includes a winch 12 (FIG. 2) with a guiding sheave 13 and a steel rope 14.

The casting 7 (FIG. 1) is carried by a load-supporting trolley 15 to which hangers 11 are attached.
The load-supporting trolley 15 is driven by a drive chain 16 including a carriage 17.

Drive chain 16 of load-supporting trolley 15
Arrester 1 allows controllable disconnection from
8 (Fig. 2), orbit section 1 of orbit 5.
This is done at 0.

In detail, the load-supporting trolley 15 carrying the hanger 11 supporting the casting 7 is moved along the track 5 by the action of the carriage 17 of the drive chain 16 of the overhead push-type conveyor 6 to the track section 10 of the movable frame 9. Load-supporting trolley 1 engaged with carriage 17 when transported to
5 arrester member 31 (Fig. 3) (arrester 18
) passes over a laterally movable control catch 32 , pivots around this control catch 32 , leaves the carriage 17 and moves the load-bearing trolley 15 from the carriage 17 of the drive chain 16 . Separate.

To prevent the load-bearing trolley 15 from moving backwards, a spring-loaded stop 33 is provided on the track section 10 of the movable frame 9 so that the load-bearing trolley 15 can only move forward.

After the cleaning of the casting 7 is completed, the movable frame 9 is moved by a winch 12 carried by the frame structure 8.
is raised to its initial uppermost position and the track section 10 is realigned with the track 5 of the overhead push type conveyor 6. A pneumatic drive means (not shown in FIG. 3) moves the control catch 32 laterally, causing the arrester member 31 to pivot under gravity into a vertical position, causing one of the carriages 17 of the drive chain 16 of the overhead push-type conveyor 6 to move. engages with the arrester member 31 to release the load-supporting trolley 15 from the movable frame 9 and reconnect the load-supporting trolley 15 to the drive chain 16 to override the load-supporting trolley 15. Move onto track 5 of head push type conveyor 6.
Therefore, the overhead push type conveyor 6
It can be seen that the drive chain 16 moves only the load-supporting trolley 15 carrying the hanger 11, and the movable frame 9 remains horizontally stationary.

As already mentioned, by aligning the track section 10 (FIG. 1) of the track 5 with the other sections of the track 5, the load-bearing trolleys 15 of the overhead push-type conveyor 6 are placed inside the tank 1. After cleaning is completed, the load-bearing trolley 15 can be moved further over the overhead push-type conveyor 6.

Since the device for feeding the castings into the tank is configured in this way, there is no need to remove the castings from the hanger and then place the castings on the hanger again, and the structure of the cleaning device is therefore simplified. , the productivity of this cleaning device increases.

At the lowest position of the movable frame 9, a corresponding sensor (not shown) of the overhead push-type conveyor 6 is activated for subsequent load-supporting operations until cleaning of the castings on the preceding load-supporting trolleys has been completed. The trolley 15 is interlocked from entering the cleaning device.

The casting 7 is suspended from a hanger 11 and lowered with it into the tank 1, the device for holding the casting 7 being in the form of a gripper 19.

Since the device for feeding the casting 7 into the tank 1 has the above-described structure, the gripper 19 is connected to a pair of bell cranks 20, that is, two arm levers (second
Each bell crank 20 is fixed to a pivot pin pivotally connected to a movable frame 9.
A cam 21 is provided at its upper end. When the movable frame 9 is in the uppermost position, the upper end of the cam 21 of each bell crank 20 collides with the frame structure 8, and when the movable frame 9 descends, the lower end of the cam 21 first collides with the flange 22 on the upper side of the tank 1. The bell crank 20 then pivots together with the pivot pin relative to the movable frame 9 and grips the casting 7 by means of a projection 23 provided at the lower end of the bell crank 20. Therefore, when the movable frame 9 is lowered to the lowest position, the movable frame 9 and the casting 7 are positioned in the proper position within the tank 1. When the movable frame 9 is raised again after cleaning the casting, the upper end of the cam 21 hits the frame structure 8, and the bell crank 20 pivots together with the pivot pin, releasing the casting 7.

In order to further simplify the construction of the cleaning device, it is convenient for the electrodes 2 to be mounted on the grippers 19 (FIG. 1), i.e. on the respective bell cranks 20 (FIG. 2).

Although the cleaning device of the present invention may include electrodes of any suitable known construction, the electrodes are conveniently provided with longitudinally flexible electrical wires. This makes the cleaning device more compact, with the electrodes arranged horizontally and the discharge energy being directed, for example, to the side of the casting or to other suitable locations depending on the structure and shape of the casting. , can be directed towards the casting in the most efficient manner. Additionally, by providing the electrode with highly flexible wires and reducing the overall size of the electrode, the electrode can be properly positioned with respect to any portion of the casting. It is thus possible to satisfy the prerequisites for the most effective and high-quality cleaning.

The electrohydraulic cleaning device for castings described above operates as follows. A load-supporting trolley 15 (FIG. 1) carrying a casting 7 on a hanger 11 is conveyed along an overhead push-type conveyor 6 via a carriage 17 and a drive chain 16.
is moved towards a device for feeding it into tank 1. When the load-bearing trolley 15 is moved into the track section 10, which is fixed integrally with the movable frame 9, the load-bearing trolley 15 is separated from the drive chain 16 by a controllable arrester 18 (FIG. 2). It will be done. In the uppermost position of the movable frame 9, the bell cranks 20 have their cams 21 in contact with the frame structure 8, so that the lower arms of the bell cranks 20 move away from each other. Trolley 15 for load support (Fig. 1), hanger 11
and a winch 12 for lowering the movable frame 9 together with the casting 7 into the tank 1 containing the working fluid.
is actuated, and the cam 21 (FIG. 2) comes into contact with the flange 22 of the tank 1. As the movable frame 9 descends, the weight of the movable frame 9 with the casting 7 applied acts on the cam 21, and the casting 7 is held by the protrusion 23 of the bell crank 20, while the electrode 2 It is moved towards the selected part (the lowest position of the movable frame 9 is indicated by the dashed line in FIGS. 1 and 2).

Current pulses are delivered to the electrode 2 via the wire 3 by a generator 4, creating a series of high voltage discharges between the casting 7 acting as the negative electrode and the positive electrode 2 in the working fluid. The energy of the electrical discharge cleans the casting.

When the cleaning of the casting 7 is completed, the movable frame 9 is lifted from the bath 1 to the uppermost position where the track section 10 (FIG. 1) of the track 5 is aligned with the other section of the track 5 of the overhead push-type conveyor 6. is,
When the arrester 18 is actuated, the load-supporting trolley 15 is re-engaged with the drive chain 16.
The drive chain 16 is connected to the trolley 1 for supporting this load.
5 is moved out of the cleaning device, and another load-supporting trolley carrying castings is sequentially moved into the cleaning device.

The separated particles of sand and core fall to the bottom of the tank and are removed out of the tank by any suitable known method depending on their composition and particle size.

[Brief explanation of drawings]

FIG. 1 is a schematic illustration of an electrohydraulic cleaning device for castings according to the present invention, viewed in the axial direction of an overhead push-type conveyor, and FIG. This is a cross-sectional view similar to FIG. 1, shown in a plane, and FIG. 3 shows the state in which the load-supporting trolley 15 is separated from and engaged with the drive chain 16 by the arrester 18. FIG. DESCRIPTION OF SYMBOLS 1... Tank, 5... Track, 6... Overhead push type conveyor, 7... Casting, 8... Frame structure, 9... Movable frame, 10... Track portion, 11... Hanger, 19 ...Gritzpa, 20
...Bell crank, 21...Cam, 22...Flange, 23...Protrusion.

Claims (1)

Claims: 1. An electrohydraulic cleaning device for castings, adapted to contain a working fluid therein and connected therein to at least one electric current pulse generator 4. It has a vessel 1 adapted to receive an electrode 2 , which vessel 1 is connected to a frame structure 8 under a track 5 of an overhead push-type conveyor 6 for transferring a casting 7 suspended in a hanger 11 . The cleaning device has a device for feeding the casting 7 into the tank 1, which is mounted and includes a movable frame 9 connected to the frame structure 8 and a device for holding the casting 7. The movable frame 9 is a track portion 10 that forms a part of the track 5 and is separable from the track 5, and is fixed to the track portion 10 located directly above the tank 1. , the device for feeding said castings into a tank moves said movable frame 9 together with a hanger 11 of said overhead push-type conveyor 6 in said track section 10 and a casting 7 held on said hanger 11. a mechanism for vertical movement, the track portion 10 fixed to the movable frame 9 being aligned with the track 5 when the movable frame 9 is in the uppermost position; The device for holding the casting electrofluid is characterized in that it has a gripper 19 rotatably mounted on the movable frame 9 and adapted to hold the casting 7 in one fixed position. type cleaning equipment. 2. In the electrohydraulic cleaning device according to claim 1, the electrode 2 is connected to the gripper 1.
9. 3. In the electrohydraulic cleaning device according to claim 1 or 2, the gripper 19
is in the form of two bell cranks 20,
The crank has a cam 21 mounted on each or one of its arms, which cam 21 engages the frame structure 8 in the uppermost position of the movable frame 9 and engages the flange 22 of the tank 1 in the lowermost position of the movable frame 9. It is designed to mesh with
The other arm of the bell crank 20 is provided with a protrusion 23 which is adapted to hold the casting 7 at the lowest position of the movable frame 9 under the action of gravity of the movable frame 9 on which it is mounted. The above-mentioned cleaning device is characterized by: