JPS6049069B2 - Submerged discharge blasting equipment for castings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the field of casting technology, and in particular to a device for removing and cleaning cores and foundry sand from castings, the operation of which is based on the effect of submerged discharge.

As used herein, the term "in-liquid discharge effect" refers to the effect exerted on a solid body by pulsed pressure induced by a high voltage discharge in a liquid.

Hence, the term "submerged discharge blasting" of a foundry is used to destroy a layer of core and foundry sand deposited on the surface of the foundry by the effect of electrodes placed in the liquid and a pulsed electrical discharge generated across the casting. This refers to the work of removing liquid by the effect of submerged discharge.

The proposed submerged discharge blasting equipment is basically used for processing large castings, and is preferably used in factories producing small and medium quantities of castings.
In some cases, it can also be used in factories that mass produce castings.

The term "large casting" is used here to refer to objects ranging from 100 kg to 4,000 kg.
It targets castings of 0k9 or higher. Among the equipment used to clean (especially large) castings, submerged discharge blasting equipment stands out due to its high productivity, economy, ability to clean complex shaped castings, and improved working environment. standing. However, it cannot be said that the problems associated with cleaning castings using these devices have yet been fully resolved. Most of the equipment for submerged discharge blasting of castings is adapted for high volume production lines.

Such devices basically have a similar structure,
For example, as described in British Patent No. 1,303,223, there is provided a liquid tank, a group of electrodes set at characteristic points of the casting, an electrode positioning mechanism, and a liquid tank that removes the casting from a feeding conveyor and places the casting in the liquid tank. and a handling device that serves to feed the material to the material. However, it is well known that large castings do not need to be produced in equal quantities industrially, and therefore such castings can be produced in single pieces or in small quantities of rods. It is clear that submerged discharge blasting equipment of the type described above is not suitable for cleaning large single-piece castings.

This is because in this case it is necessary to rearrange the electrode groups and rebuild the handling equipment for each individual casting or casting rod, which is time consuming and requires less time to prepare the working equipment. This is because the amount of time spent is unreasonably long. The apparatus for submerged discharge blasting of castings described in USSR Inventor's Certificate No. 415091 is much more suitable for use in the production of single or small quantities of large castings.

This device includes a base, a liquid tank mounted on the base,
and an electrode fixed in a device for introducing the electrode into the liquid bath and electrically connected to a pulsed current generator.

The apparatus also includes a device for feeding the casting into the bath, which device includes a movable platform mounted in vertical guides located on either side of the bath and a flexible tension member. and a drive unit connected to the platform via a drive unit. The drive here consists of a winch connected to the platform via a cable and pulley system. The device further includes a loading device, which device includes a horizontal guide consisting of a section mounted on the base and a section mounted on the liquid bath, and a container containing the castings along the horizontal guide. and a self-propelled carriage for transporting them from a loading point to sections disposed above the liquid tank and returning them to an unloading point. The self-propelled carriage consists of a three-part frame mounted on rollers, each with two parts positioned along and directly above one of the guides.
It has two longitudinal or lateral beams and one lateral beam connecting the ends of the side beams. The frame has a U-shaped ring projected onto a plane, and is installed so that its opening faces the liquid tank. The frame crossbars carry an electric drive for the rollers for moving the frame along the guide. A container containing the castings is placed on said carriage at a loading/unloading station located on a guide section mounted on the base, the front part of which engages on the side beams and the rear part of The parts are engaged horizontally. For this purpose, the container has a bracket with a pin, for which a recess is provided on the carriage frame. Here, one recess is provided on each of the unreinforced ends of said side beams, and two recesses are provided on the lateral top. This arrangement of support members prevents the side beams of the carriage from twisting due to the weight of the container containing the casting. Once the container is placed on the carriage, the carriage is moved along the horizontal guide to the limit position of the section mounted on the liquid reservoir. As a result, the container comes to rest on the side beam 7 at a point beyond the end surface of the horizontal guide. This is because otherwise the bracket with the pins on the front part of the container would later rub against the horizontal guides when lowering the container on the platform. When the carriage reaches this point, a device for feeding the casting into the bath is activated, the platform of which moves under the carriage, and the container is moved through a receiving member provided on the platform. Lifted from the carriage. The carriage then makes a return movement, so that the platform with the container is freely lowered into the bath. Once the submerged discharge blasting of the casting is complete, the container containing the casting is returned to the loading/unloading station in reverse order by platform and carriage. Thus, one cycle time T of operation of this device consists of the following time intervals:

C = Loading time, R = Time to transport the container from the loading/unloading station to the position where the container is immersed in the liquid tank, C = Time to immerse the container in the liquid tank, ζ = Processing time, C = Time to withdraw the container from the bath, t = time to transport the container back to the loading/unloading station, ζ = time to unload the carriage.

Here, T=t1+T2+T3+T4+chi+T6+T7
Then, only T4 of T can be classified as production time Tp, but the remaining period is non-production or handling time Th=(T-TP)=(t1+T2+T3+ζ+T5
+! +T7)-ζ=t1+etal+T3+chi+T6+chi.

As is clear from the above, the productivity of this device can be increased by shortening the processing cycle, for example by reducing the handling time Th. A possible means of achieving this goal would be to carry out loading/unloading operations at the same time as casting processing, since the loading and unloading stations are located on the same side of the bath on the guide. The space for these stations is 1. It is impossible because Thus, the next conveyor cannot deliver for processing until the carriage is unloaded. On the other hand, the loading and unloading stations can be placed on opposite sides of the tank so that the next container is loaded while the previous container is in the tank! It is also not possible to load a carriage and transport the next container from the loading station to the tank as the preceding container is transported from the tank to the unloading station. because,
Necessarily, the guide of this device terminates above the bath in order to allow the container to be lowered into the bath. Furthermore, the load device guide limits the width of the castings to be processed.

This is because castings exceeding the guide spacing (gauge) cannot pass into the bath. This reduces the throughput (range of products processed) of the equipment. One object of the invention is to arrange the loading and unloading stations separately and separately so that processing and handling operations can be carried out in parallel, thereby ensuring high efficiency by reducing the process time. An object of the present invention is to provide a discharge blasting device.

The main object of the invention is to provide an apparatus for submerged discharge blasting of castings which guarantees high productivity.

The foregoing and other objects of the present invention include a base, a liquid tank mounted on the base, and a device for feeding castings into the liquid tank, the apparatus comprising: a delivery device comprising a movable platform mounted in a vertical guide and a drive connected to said platform via a flexible tension member; A loading device having a horizontal guide with a section arranged on the bath and a device for transporting the casting along said horizontal guide, an electrode and a device for introducing the electrode into the bath. and a pulsed current generator electrically connected to the electrode. The section arranged above is separated from the horizontal guide arranged on the base and is installed on the movable platform of said feeding device for feeding the casting into the liquid bath, and is provided with a compensator for alignment errors of the platform, through which the tension member is connected to the drive of the device for feeding the casting into the liquid bath, and is mounted on the base. The horizontal guide provided has sections disposed on each side of the bath, these sections being in contact relationship with the guides mounted on the movable platform 1, and the castings are brought into contact with the said loading device. The device for conveying the casting along the horizontal guide is realized by a submerged discharge blasting device, characterized in that it is operatively interlocked with a device for feeding the casting into the bath. Ru. Such a construction of the submerged discharge blasting apparatus allows the loading and unloading stations to be arranged at a distance from each other on different sides of the processing station, so that the platform of the apparatus for feeding the castings into the liquid bath is is in its uppermost position, the guide sections mounted on said platform are brought into contact or end-to-end alignment with respect to sections located both upstream and downstream of the processing station, thus [Complete] for containers containing castings
A passage is obtained.

Thus, when the treatment (blasting) is finished and the container is lifted out of the bath, it is aligned in the same direction as the transport path on the "loading station to platform" section of the horizontal guide that it previously passed. It is transported to the opposite section of the guide where the unloading station is located, and not in the return direction as in conventional devices. In this way, auxiliary loading/unloading operations and, in part, transport operations of the castings to the processing station can also be carried out simultaneously with the processing operations of the castings, shortening the operating cycle of the device and increasing production efficiency. Improves sex. Furthermore, due to the fact that the guide section arranged above the bath is mounted on a movable platform of the device for feeding into the casting bath and is movable in conjunction with said platform, the basic In particular, there is no problem in loading castings of any width into the liquid tank, which has the advantage of widening the throughput of the device.

In order for the apparatus to operate as described above, it is necessary that the horizontal guide section mounted on the platform be brought into precise aligned contact relationship with the horizontal guide section mounted on the base. This is made possible by the construction of the device for feeding the casting into the bath, which device incorporates a platform alignment error compensator. The operational capability of the device is further ensured by the fact that said device for conveying the castings along the horizontal guide is operatively interlocked with a device for feeding the castings into the bath. .

In the absence of such an interlocking mechanism, the former device (transport device) would be able to move the container containing the casting onto the platform before the movable (on the platform) and fixed sections of the horizontal kite are in aligned contact. In such a case, the entire device may be damaged. Said apparatus for feeding castings into the liquid bath of a submerged discharge blasting apparatus for castings includes a locator (defining the uppermost position of a movable platform installed on a vertical guide) on which the platform is mounted. Preferably, a position regulator) is provided.

This facilitates bringing horizontal guides disposed on the platform into aligned contact with horizontal guides disposed on the base. Conveniently, the locator at the top of said platform is in the form of a stop, each stop being provided with horizontal and inclined contact flats, said platform also having a corresponding contact flat on each of said stops. Conveniently, horizontal and inclined contact flats are provided to increase the accuracy of placement of the platform in the uppermost position.

Preferably, the horizontal contact flat of said stop has a pad attached thereto.

This pad is intended to compensate for errors in placing the movable platform in the uppermost position, which may result, for example, from wear of the surface of the contact flat. The compensator for compensating for alignment errors of the platform of the device for feeding castings into the liquid bath of the submerged discharge blasting device for castings is in the form of a lateral mounted in a twin guide. is convenient, in which case the end of the transverse beam is connected to a flexible tension member, and the transverse beam itself is connected to a drive part (material) via a member that makes them swingable. It's convenient to be there.

The section of the twin guide corresponding to the limit position of the horizontal beam when raising the movable platform is provided with a recess for providing a gap between the seven ends of the horizontal beam and the twin guide. This structure ensures compensation for the platform misalignment at the uppermost position of the platform caused by unequal lengths of the flexible members as they try to stretch under the action of an applied force.

If the lengths of the tension members attached to the ends of one lateral are unequal, then when the lateral reaches its limit position, the shorter tension member will be tightened and it will be connected. Prevent further movement of the transverse end. The traverse is then turned by the action of the drive to which it is pivotally mounted. The center of rotation in this case is the point attached to the shorter tension member, and the radius of rotation is from the end connected to the shorter tension member to the longer tension member. This is the distance to the (digit) end connected to. Turning of the crossbeam within the guide is made possible by the gap between the end of the crossbeam and the bottom of the recess provided in the twin guide. The gap size ΔI between the end of the horizontal beam and the twin guide is equal to .

Here, a is the distance between the critical support points at one end of the horizontal plane, and b
is the distance between the ends of the lateral, and α is the permissible turning angle of the lateral, which does not exceed 10 degrees.

The driving part of the device for feeding the casting into the liquid tank in the submerged discharge blasting device for castings is a hydraulic system having a hydraulic cylinder whose cylinder rod is pivotally connected to the lateral side of the platform alignment error compensator. is preferred.

wherein said hydraulic cylinders are provided with a system for synchronizing the movement of their rods, said system comprising a hydraulic motor for delivering and removing hydraulic fluid into the hydraulic cylinders, and a rotor that is aligned with each other. a bypass valve interconnecting the hydraulic cylinder in communication with the fixedly connected hydraulic motor. Such a construction of the apparatus for submerged discharge blasting of castings makes it possible for the operation of said apparatus for feeding castings into a liquid bath to ensure that said horizontal guide is Section(s) are reliably aligned! contact can be made.

placed on the base of the foundry submerged discharge blasting equipment,
The horizontal guide sections of the loading device may be linear and enclosed in shape, and the device for conveying the castings along the sections includes grips disposed on each of the sections of the guide guide. It can have the form of a chain conveyor with.

By modifying the submerged discharge blasting equipment for castings in this way, the container carrying the castings can be directly conveyed on the guide, which not only simplifies the structure of the equipment, but also allows the castings to be removed from the loading process and processing equipment. The removal process is also simplified.

This is because such a construction eliminates the need for a self-propelled carriage. Alternatively, the horizontal guide of the loading device of the apparatus for submerged discharge blasting of castings can be projected onto a plane to be curved and ring-shaped, and the casting can be moved along said guide. The device for conveying the material may be in the form of a rotor with grips.

Such a modification would be the simplest and most convenient device for automating the operation of the device.

The present invention will be described in more detail below with reference to the accompanying drawings.

Referring to FIG. 1, the apparatus for submerged discharge plastering of foundries has a base 1 on which a liquid bath 2 with a funnel-shaped bottom part 3 is installed.

A gantry (crane) 4 carrying an electrode unit comprising an electrode 5 and a device 6 for introducing the electrode into the tank is mounted above the tank.

The device for submerged discharge blasting of castings also has a device for feeding the casting into the bath, which feeding device is arranged in vertical guides 8 installed on both sides of the bath 2. It comprises a mounted movable platform 7 and a drive connected to said movable platform 7 via a flexible tension member 9 passed around a pulley 10. In FIG. 1, the movable platform 7 is shown at both the uppermost and lowermost limits of vertical movement in the liquid bath, but in reality the movable platform 7 is located at both of these positions. , and thus can be moved vertically between these positions. To perform this movement, both sides of the movable platform 7 are each fixed to one end of a flexible tensioning member 9, and to the other end of the flexible tensioning member 9 a horizontal beam 21, which will be described later, is fixed ( Figure 2). The movable platform 7 and the transverse 21 thus move in vertically opposite directions. A pair of hydraulic cylinders 19, which will be described later, are arranged vertically on both sides of the liquid tank 2.
The lower end of the mouthpiece 25, which projects downward from the base, is pivotally connected to the horizontal member 21. With such a configuration, by controlling the supply of hydraulic pressure to the hydraulic cylinder 19, the horizontal 21 can be raised or lowered via the rod 25, and thereby the movable platform 7 can be lowered or raised.
The apparatus for submerged discharge blasting of castings also has a loading device including a horizontal guide 11, said guide 11
section 12 disposed above the liquid tank 12 and the section 12 disposed above the liquid tank 12
It has sections 13 and 14 located on either side of the.

Here sections 13 and 14 of the horizontal guide 11 are mounted on the base 1, while section 12 is separated from sections 13 and 14, and the movable part of said device for feeding the castings into the bath. It is installed on platform 7. The ends of the horizontal guides of section 12 are thus brought into contact with the ends of the horizontal guides of sections 13 and 14. The loading device furthermore has a device 15 for conveying the castings along the horizontal guide 11.

The castings are transported in a grid-like container 16 equipped with rollers 17. Referring now to FIG. 2, the device for feeding castings into a bath has a locator 18 for regulating the uppermost position of the movable platform 7, which locator is mounted on a vertical guide 8. is set up.

The details of the locator will be explained below. The feed device also has a platform alignment error compensator, via which the flexible tension member 9 is connected to a drive device, which is a hydraulic system including a hydraulic cylinder 19. Each of the platform alignment error compensators is a TwinKaid 20
The roller 21 is mounted inside the roller 21 and is provided with brackets 22 carrying rollers 23 at both ends thereof. 21, which is spread across this roller 23, is engaged with the twin guide 20. The horizontal member 21 is attached to a rod 25 of a pair of hydraulic cylinders 19 via a hinge joint 24. The action of these hinge joints allows the transverse arm to swing relative to the rod 25 of the hydraulic cylinder 19. (It will be appreciated that the number of hydraulic cylinders 19 acting on the transverse 21 depends on the magnitude of the force applied to the tension member 9). Twin guides 20 corresponding to the limit positions for lifting the horizontal movable platform 7
section is provided with a recess with a gap between the bottom 26 of the recess and the end of the twin guide (
Figure 3). As shown in FIG. 3, the size of the gap Δl
is ΔI=Asinr2bsjrl2.

Here, a is the distance between the limit support points at one end of the horizontal beam, b is the distance between both ends of the horizontal beam, and α is the permissible rotation angle of the horizontal beam, which is an angle not exceeding 10 distances. Referring now to FIG. 4, the locators 8 of the uppermost position limit of the movable platform 7 are in the form of stop members, each provided with horizontal and oblique contact flats 27 and 28, respectively.

A compensation pad 29 mounted on the horizontal flat 27 of the stop member makes it possible to compensate for errors in positioning the platform 7. Note that this error is caused by wear of the contact flat, etc. The end of the movable platform 7 carries a sliding block 30 by which the movable platform 7 is engaged with the vertical guide 8 . Furthermore, slide block 3
0 is also provided with horizontal and oblique flats 31 and 32, corresponding respectively to the respective contact flats 27 and 28 of the locator stop 18, to improve the accuracy of the positioning of the platform 7 in the uppermost position. Referring now to FIGS. 4 and 5, said movable platform 7 is a frame with two longitudinally oriented beams 33 connected by transverse beams 34; They are connected by a longitudinally oriented 35.

The movable platform 7 thus has a lattice structure which allows the slurry resulting from the submerged blasting of the casting to settle on the bottom of the liquid bath 2. Each of the longitudinally oriented 33 corresponds to one of the horizontal guides of said loading device.
He is wearing one. Each of the horizontal guides 11 has the form of a rail, as shown in FIG.

) Next, we will discuss details of the structure of the drive section of the device for feeding castings into a liquid tank according to the present invention.

The drive unit is in the form of a hydraulic system, which system has an inlet pipe 36 and an outlet pipe 37 for the aforementioned hydraulic cylinder 19, as shown in FIG. It has a built-in throttle 38 that can be adjusted. The hydraulic cylinder 19 is a hydraulic distributor 3.
9 and hydraulic cylinders are connected to these tubes via a system that synchronizes the movement of the rods. Said system for synchronizing the movement of hydraulic cylinder rods has a branch pressure piping 40 which connects the hydraulic distributor 39 to the piston chamber 41 of the hydraulic cylinder 19. Each branch of the pressure piping 40 contains a hydraulic motor 42.

The rotors of all hydraulic motors are fixedly connected via jaw joints 43. Adjacent branch pipes of the pressure piping 40 are connected by a bypass valve 44. In addition, the pressure relay 45 is electrically connected to the actuator of the hydraulic distributor 39 (wire connection not shown).
It is provided in a section of pressure piping 40 between the hydraulic motor 42 and the hydraulic cylinder 19. Hydraulic cylinder 1
The 9 rod chambers 46 are connected to the hydraulic distributor 39 by branch piping 47 .

Referring now to FIG. 8 of the accompanying drawings, FIG. 8 shows one example of a modification of a loading device for a submerged discharge blasting apparatus for castings according to the present invention.

As can be seen from the figure, the sections 13 and 14 of the horizontal guide 11 mounted on the base are rectangular, and the device 15 for conveying the castings along the horizontal guide carries a clip 50; It consists of one chain conveyor 48 and 49 arranged on sections 13 and 14 of the guide, respectively. chain conveyor 4
8 is provided with a pair of traveling chains on both sides of the section 13, each supported by a sprocket on both sides,
The sprocket at one end is connected to the drive shaft, and this drive. The shaft is connected to an electric motor via a clutch. The chains on both sides have a horizontal bar connected therebetween, and a grip 50 is fixed to this horizontal bar. grip 5
0 removably grips the connecting member of the lattice-shaped container 16 on which the casting is placed, and when the chain receives the rotational drive of the electric motor via the clutch, the lattice-shaped container 16 is moved along the horizontal guide. The chain conveyor 49 is also configured in the same manner as the chain conveyor 48 described above, and can grip the lattice-shaped container 16 with the grip 50 and move it along the horizontal guide. 9th
The figure shows another example of modification of the load device of a submerged discharge blast blasting device for castings.

According to the invention, the horizontal guide 11 of the loading device is curved in the plane and constitutes a ring shape in this modification. The device 15 for conveying the castings along said guide 11 has the form of a rotor 51 with holes corresponding to the shape and dimensions of the container in which the castings are placed. The wall defining the hole acts as a grip 50. With further reference to FIG. 10 of the appended drawings, there is shown a schematic diagram of a control circuit of a device for feeding a casting into a bath and a device for transporting a casting along a horizontal guide; According to the present invention, the control circuit of the device for feeding the casting into the liquid tank includes the electromagnetic relays 54 and 5 which control the operation of the hydraulic distributor 39.
It has circuits 52 and 53 including 5.

The control circuit of the device for conveying castings along horizontal guides includes circuits 56 and 57 of electromagnetic relays 58 and 59 controlling the drive of the conveyor 48 as well as It also includes a relay circuit (not shown) controlling circuits 56 and 5.
It is the same as 7. The circuits 52 and 53 include a "down" pushbutton 60 and a "up" pushbutton 61, which pushbuttons are located on a control panel (not shown).

The circuit 52 of the relay 54 has a built-in contact 55a of the relay 55, and the circuit 53 of the relay 55 has a built-in contact 55a of the relay 54.
It has a built-in 4a. The circuit 52 of the relay 54 also includes the contact 62a of the relay 62 of the limit switch 63, and the circuit 53 of the relay 55 also includes the contact 64a of the relay 64 of the limit switch 65. The limit switches 63 and 65 are arranged in a passageway of the movable platform 7 (FIG. 2). Circuits 56 and 57 incorporate "forward" pushbuttons 66 and "reverse" pushbuttons 67, which are located on a control panel (not shown). Circuit 56 of relay 58
has a built-in contact 59a of the relay 59, and the relay 59
The circuit 57 has a built-in contact 58a of a relay 58.
In addition, the circuit 56 of the relay 58 is connected to the limit switch 6.
It has a built-in contact 62b of the No. 3 relay 62. The device for feeding the casting into the bath is thus operatively interlocked via the relay 62 with the device for conveying the casting along the horizontal guide. When the device for conveying castings along a horizontal guide has the form of a rotor, the contacts of the relay 62 of the limit switch 63 should also be integrated into the circuit 57 of the relay 59.
Reference is now made to Figures 1, 11, 12 and 13 of the appended drawings, which show details of a device 6 for introducing an electrode into a submerged discharge blast blasting apparatus for castings according to the present invention. A gantry 4 mounted on the tank 2 has two parallel I-shaped beams 6.
8, from which a moving bridge 70 for introducing the electrodes of the device 6 into the liquid bath is suspended via rollers 69.

The drive part of the moving bridge 70 has a hydraulic motor 71 and a chain transmission 72, and is mounted on the gantry. Said moving bridge 70 carries a moving carriage 73 mounted on rollers 74. The carriage 73 is provided with a drive for moving it along the moving bridge 70, the drive having a hydraulic motor 75 and a chain transmission 76. The carriage also houses a device for vertically moving the electrode, which device is connected to the split tube 7.
7 in the form of a vertical guide. The split tube houses a slide block 78 to which an electrode holder 79 is attached. Electrode 5 is mounted within the electrode holder. The vertical displacement device is further connected to a slide plate link 78 and is connected to a hydraulic motor 8.
0 and a chain transmission 81. The apparatus for submerged discharge blasting of castings also has a pulsed current generator 82 electrically connected to the electrode 5 (FIG. 14).

The device operates as follows.

When the apparatus for submerged discharge blasting of castings is in the starting position (FIG. 1), the movable platform 7 is set in the uppermost position, so that the horizontal guide 11 of the section 12 mounted on the movable platform 7 is Horizontal guide 1 of sections 13 and 14 placed on base 1 so that platform 7 is pressed tightly against stop 18
1 (FIG. 4). Accurate positioning of the platform 7 with respect to the stop 18 is achieved by aligning the contact flats 31 and 32 on the sliding block 30 of the platform 7 with the contact flats 27 and 28 of the stop 18. With the platform 7 in the aforementioned position, one of the crossbeams 21 mechanically acts on the limit switch 63 (FIG. 2), which activates the control circuit 56 of the device for conveying the casting along the horizontal guide. The contacts of relay 62 (FIG. 10) are closed.

Container 16 containing the casting is moved to section 13 of horizontal guide 11 with the aid of a factory hoist (not shown).
A coupling device arranged above and thus provided on the wall of the container 16 engages with the grip 50 of the device 15 for conveying the castings along the horizontal guide 11.

The operator presses the "forward" pushbutton 66 (FIG. 10) to activate the control circuit 5 of the drive of the conveyor 48 (FIGS. 1 and 8).
Close 6.

Conveyor 48 conveys container 1 via one of the grips 50.
6 and guide it along the guide 11 into section 1.
Move to 2. Once the container 16 is fully positioned on the section 12, the operator activates the "down" pushbutton 60 (FIG. 10), which activates the relay controlling the operation of the hydraulic distributor 39 (FIG. 7). 55 circuit 53 is closed. The hydraulic distributor 39 connects the pressure piping 40 with the outlet pipe 37 and the piping 47 with the inlet pipe 36. Thus, the pressurized liquid flows from the inlet pipe 36 through the piping 47 to the hydraulic cylinder 19. is introduced into the rod chamber 46. The action of said liquid and the action of the weight of the platform 7 and the weight of the container 16 is carried out via the flexible tension member 9 on the rod 25 of the hydraulic cylinder 19 as well as the transverse 21 (second, 3), and the liquid is pushed out from the piston chamber 41 (Fig. 7) into the branch piping 40 containing the hydraulic motor 42. The platform 7 (Fig. 1) carrying the container 16 is pushed into the liquid tank. Because they are fixedly coupled, each rotor of the hydraulic motor 42 (FIG. 7) rotates at the same speed, so that an equal amount of liquid is delivered from the piston chamber 41 of the hydraulic cylinder 19. All sides of platform 7 (FIG. 1) are lowered uniformly. Hydraulic motor 42 thus acts as a compensator for alignment errors of platform 7. Also, throttle 38 (FIG. 7) A variable flow restricting member is provided, and the rate of descent of the platform 7 can be controlled by adjusting the amount of oil discharged from the piston chamber 41 of the hydraulic cylinder 19 through the distributor 39 when the platform 7 is lowered. The throttle 38 equilibrates the total flow of liquid forced out of the piston upper chamber 41 of the hydraulic cylinder 19 via the outlet pipe 37. When the platform 7 is lowered into the liquid tank, the transverse 21 is connected to the limit switch 63 (FIG. 2). ).The relay 62 (FIG. 10) opens its contacts 62b and is thus actuated to open the circuit 56. This actuation causes the device 15 for conveying the castings along the horizontal guide to be activated. is prevented and the casting is prevented from being fed into the processing equipment as long as the guide 11 (FIG. 1) of section 12 and the guides of sections 13 and 14 remain in a non-contact condition. It stops when the limit switch 65 (FIG. 2) at the lowest position of the platform is actuated.

Relay 64 (FIG. 10) opens its contacts 64a, thereby opening circuit 53 controlling the operation of hydraulic distributor 39 (FIG. 7) and interrupting the hydraulic drive. When the platform 7 (FIG. 1) is in its lowest position, the container 16 containing the casting is completely immersed in the bath with the working liquid.

The operator is. The electrode 5 is placed in the immersion container 16 containing the casting.
and manipulate the electrode with the aid of a device 6 (Figs. 1, 11, 12, 13) for introducing it into the liquid bath. The electrode 5 is initially moved in a horizontal plane by a moving bridge 70 and a carriage 73, and the casting. and then approaches the casting as the operator activates the hydraulic motor 80 from the control panel. A hydraulic motor 80 operates on the slide block 78 via a chain transmission 81. The block 78 moves along the split tube 77 and moves the electrode holder 79 with the electrode 5 attached to the slide block. The core and foundry sand baked onto the surface of the casting are destroyed in a known manner by the action of the pulsed electrical discharge that occurs between the electrode 5 and the casting. When the casting has a complex shape,
The operator moves the electrode 5 to each characteristic point of the casting according to a predetermined diagram to ensure thorough cleaning. Once the operator has completed cleaning and retracted the electrode 5 to its initial position, the operator presses the "raise" pushbutton 61 (Figure 10), which activates the relay controlling the hydraulic distributor 39 (Figure 7). 54 circuits 52 are closed.

The hydraulic distributor 39'' connects the pressure piping 40 with the inlet pipe 36, and connects the piping 47 with the outlet pipe 37.
It operates to connect with. Pressurized liquid from the intake tube 36 is introduced via piping 40 into the upper chamber 41 of the hydraulic cylinder 19, which is actuated. Hydraulic cylinder 19 moves platform 7 (FIG. 1) upwardly via flexible tension member 9 (FIG. 2). A smooth and uniform rise of the platform 7 is ensured by the synchronous interlocking of the rods 25 of the hydraulic cylinders 19, which are dependent on the flow of liquid introduced into the chambers 41 (FIG. 7) of the hydraulic cylinders 19. It arises from the fact that the quantities are equal. Moreover, this equal inflow into the chamber 41 of the hydraulic cylinder 19 results from the fact that the fixedly connected rotors of the hydraulic motor 42 have the same rotational speed, which hydraulic motor This balances the flow of liquid within the 40 branch pipes. However, in some cases the platform 7 (FIG. 1) may become misaligned during its movement such that when it reaches its uppermost position one of its side edges (several) stops at the stop.
8 and another side edge may try to move past the corresponding stop 18. In such a case, an excess of hydraulic pressure will occur in the upper piston chamber 41 (FIG. 7) of the hydraulic cylinder 19, which is connected to the side end of the platform 7 (FIG. 1) which has reached its uppermost position. The action of this excess pressure causes the corresponding bypass valve 44 (FIG. 7) to actuate and divert fluid from the chamber with excess hydraulic pressure to the hydraulic pressure connected to the unlocked side end of the platform 7 (FIG. 1). It is introduced into the chamber of cylinder 19.
This causes the hydraulic motor 42 (Fig. 7) to further operate.
Fluid is forced into the chamber of the "lagging" hydraulic cylinder 19, the movement of the rod of the cylinder is accelerated and the platform 7 is flattened. The platform may also be misaligned in its uppermost position due to non-uniform extension of the flexible tension member;
In this case, the platform alignment error compensator operates as follows.

A horizontal bar 21 pivotally connected to a rod 25 (Figs. 2 and 3)
The flexible tensioning members 9 are attached in pairs to the twin guides 20, and the transverse beams perform a plane parallel movement within the twin guide 20 to pull the flexible tensioning members 9. When the platform 7 reaches its uppermost position (FIG. 3), the shorter member 9 of said pair of tension members prevents further movement of the end of the traverse 21 to which it is attached. Thus, due to the action of the rod 25 (FIG. 2) of the hydraulic cylinder 19 to which the lateral 21 is pivoted, the lateral 21 is rotated. Note that the center of rotation is the point of attachment of the shorter tension member 9 to the transverse 21 (FIG. 3), so that the longer tension member 9 is tensioned. Turning of the fin lateral within the twin guide is made possible by providing a gap between the end of the fin lateral and the bottom 26 of the recess provided in the twin guide 20. All of the tension members 9 are uniformly tensioned so that the platform 7
is pressed tightly against the locator stop 18, so that precise contact is maintained between the sections 12, 13, 14 of the guide 11. Platform 7 (Figure 1)
In the position corresponding to the uppermost position of , one of the laterals 21 (FIG. 2) contacts the limit switch 63.

Relay 62 (FIG. 10) operates to close its contacts 62b, thus releasing device 15 for transporting the casting along the horizontal kite. The operator activates conveyors 48 and 49 located on sections 13 and 14 of horizontal guide 11. Conveyor 49 grasps the container containing the cleaned castings and transports it to an unloading station. At the same time, conveyor 48 moves to the next container containing the castings to be processed (which had been placed on the loading station while the previous casting was being processed).
from the loading station. The cycle then repeats.

Although the invention has been described with respect to particular embodiments, it should be understood that various other modifications of the submerged discharge blasting apparatus for castings according to the invention are possible without departing from the scope of the claims.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of an apparatus for submerged discharge blasting of castings according to the present invention, and Fig. 2 illustrates an example of an apparatus for feeding castings into a liquid tank of an apparatus for submerged discharge cleaning of castings according to the present invention. , A view in the direction of arrow A in FIG. 1, FIG. 3 is a diagram showing a part of the platform alignment error compensator of the submerged discharge blasting apparatus for castings according to the present invention, and FIG. A sectional view taken along the line ■-■ in the second figure, illustrating a part of the device for
FIG. 5 is a plan view of a commercial device for feeding castings into the liquid tank of the device according to the present invention, FIG. 6 is a sectional view taken along the line ■-■ in FIG. 4, and FIG. 8 is a block diagram of the hydraulic drive of the device for feeding castings into the liquid tank of the device according to the invention; FIG. 8 shows a horizontal guide surrounded by a straight line in the loading device; FIG. 9 is a plan view of an example of modification of the submerged discharge blasting device for castings according to the present invention; FIG. FIG. 10 is a plan view of an example in which a casting is fed into a liquid tank in an apparatus according to the present invention;
FIG. 11 is a schematic diagram of a control circuit of a device for transporting castings along a horizontal guide; FIG. 1, FIG. 12 is a sectional view taken along the line ■-■ in FIG. 11, and FIG. 13 is a view showing electrodes introduced into the liquid tank of the submerged discharge blasting device according to the present invention. FIG. 14 is a functional diagram of the electrode control circuit. 1: Base, 2: Liquid bath, 5: Electrode, 6: Device for introducing the electrode into the liquid bath, 7: Movable platform, 8: Vertical guide, 9: Flexible tension 5 member, 11: Horizontal directional guides, 12: sections of horizontal guides placed on the reservoir; 13: sections of horizontal guides mounted on the base on one side of the reservoir; 14: on the other side of the reservoir; Section θ of the horizontal guide mounted on the base, 15: Device for conveying castings along the horizontal guide, 18: Locator of the uppermost position of the movable platform, 19: Hydraulic cylinder, 25: Hydraulic cylinder Rod of, 27: Horizontal contact flat of stop, 28
: inclined contact flat of the stop, 31: horizontal contact flat of the platform, 32: inclined contact flat of the platform, 41: chamber communicating with the hydraulic motor of the hydraulic cylinder, 42: hydraulic motor, 44: bypass valve,
48, 49: conveyor, 50: grip.

Claims (1)

[Claims] 1. A base 1, a liquid tank 2 mounted on the base 1,
A device for feeding castings into said bath 2 via a movable platform 7 mounted in vertical guides 8 placed on both sides of the bath 2 and a flexible tension member 9. A feeding device with a drive connected to the platform 7 and a horizontal guide 11 with a section 12 partially arranged on the base 1 and above the liquid tank 2 as well as a casting. a loading device with a device 15 for conveying along said horizontal guide 11 and an electrode 5;
and a device for introducing the electrode into the liquid tank 2, which is mounted close to the liquid tank, and a pulse current generator electrically connected to the electrode 5. In the discharge blasting device, the section 12 of the horizontal guide 11 of the loading device arranged above the liquid tank is separated from the horizontal guide 11 arranged on the base 1 and feeds the casting into the liquid tank 2. is installed on a movable platform 7 of the feeding device for the purpose of 9 is connected to the drive of the device for feeding the casting into the liquid tank, and the horizontal guide 11 mounted on the base 1 has sections 13, 14 arranged on both sides of the liquid tank 2. , which are arranged in aligned contact relationship on both sides with guides 11 mounted on the movable platform 7, said device for conveying castings along the horizontal guides 11 of said loading device. Reference numeral 15 denotes a submerged discharge blasting device, which is operatively interlocked with a device for feeding castings into a liquid tank. 2. A blasting device according to claim 1, wherein the device for feeding castings into a liquid bath is installed on a vertical guide 8 on which the platform 7 is mounted. A submerged discharge blasting device characterized by comprising a locator 18 located at the uppermost position of the submerged discharge blasting device. 3. In the blasting device according to claim 2, the uppermost locator 18 of the platform 7 is in the form of a stop, each stop having a horizontal contact flat 27 and an inclined contact flat 28. ,
Submerged discharge blasting device, characterized in that said movable platform 7 also comprises a horizontal flat 31 and an inclined flat 32 corresponding to the contact flats 27, 28 of said stop. 4. A submerged discharge blasting device according to claim 3, characterized in that the horizontal contact flats 27, 28 of the stop are fitted with compensation pads 29. 5. A blasting device according to claim 1, in which a platform 7 of said device for feeding castings into a liquid bath, a compensator for alignment errors is formed with a transverse beam 21 mounted in a twin guide 20. the end of said crossbeam is connected to a flexible tension member 9, said crossbeam 21 is connected to said drive part by means of a member which makes it swingable; Twin guide 20 corresponding to the limit position of 21 when ascending
Submerged discharge blasting apparatus characterized in that the section is provided with a recess providing a gap between the end of the lateral portion 21 and the twin guide 20. 6. In the blasting device according to claim 5, the size of the gap between the end of the transverse 21 and the twin guide 20 is equal to the distance between one limit support point of the transverse a, The distance between both ends of b and α is 10
When the allowable rotation angle does not exceed the arc angle of °, Δl=a
A submerged discharge blasting device characterized in that sin_α_−_2bsin^2(α/2) is equal. 7. In the blasting device according to claim 1, the driving part of the device for feeding the casting into the liquid tank is a hydraulic system having a hydraulic cylinder 19, and the rod 25 of the cylinder is connected to the platform 7. The hydraulic cylinder 19 is pivotally connected to the horizontal alignment error compensator 21 of the hydraulic cylinder 19.
is provided with a system for synchronizing the movement of its rods 25, the synchronization system being a hydraulic motor 42 through which hydraulic fluid is delivered to and discharged from the hydraulic cylinder 19. It has a bypass valve 44 that connects a hydraulic motor and a chamber 41 of a hydraulic cylinder 19, and the chamber 41 is in communication with the hydraulic motor to which a rotor is fixedly connected. Submerged discharge blasting equipment. 8. In the blasting device according to claim 1, sections 13 and 14 of the horizontal guide 11 of the loading device installed on the base 1 have a shape surrounded by a straight line, and the sections 13 and 14 of the horizontal direction guide 11 of the loading device installed on the base 1 have a shape surrounded by a straight line, and Said device 15 for conveying along the section is a chain conveyor 4 equipped with grips.
8 and 49, characterized in that the conveyor is arranged on each of the sections 13, 14 of the guide. 9. In the blasting device according to claim 1, the horizontal guide 11 of the loading device is ring-shaped when viewed from above, and the device 15 for conveying the casting along the guide is A submerged discharge blasting device characterized in that it is formed with a rotor having a grip 50.