RU2205090C2 - Low pressure die casting line, plant for low pressure die casting and manipuator for moving castings - Google Patents

Abstract

FIELD: processes and equipment for casting discs of motor vehicle wheels in chill molds. SUBSTANCE: line is in the form of four casting plants united by means of common platform. Plants are arranged in pairs symmetrically relative to conveyer placed under platform. Each plant has machine for low pressure die casting, delivery furnace, manipulator for extracting castings and cooling tank with descending table for receiving castings. Manipulator is in the form of four-link mechanism and it is arranged with possibility of positioning its reception pan over descending tables of cooling tanks placed at side of apparatus for loading castings onto conveyer. Manipulator is made with possibility of successively rotating hinged four-link mechanism relative to base and base relative to support. EFFECT: enhanced maintenance condition, lowered dimension, enhanced efficiency of line. 9 cl, 6 dwg

Description

 The invention relates to foundry, and in particular to the casting of non-ferrous metals and alloys under low pressure, and can be used for casting wheels of automobile wheels in metal molds.

 A known line of chill casting, including a melting unit, a casting device, a multi-position rotary machine equipped with chill sections with a combined connector, a conveyor, casting receivers made in the form of rotary trays, a casting picker from the rotary trays made in the form of a rotary console with horizontally mounted on its end with a plate, and the mechanism for transferring castings from the manipulator to the conveyor, made in the form of racks on which it is mounted with the possibility of vertical movement a drive carriage with a basket pivotally mounted on it and copiers interacting with the basket are fixed (ed. St. 1061922, IPC B 22 D 15/04, 1982).

 The line is designed for relatively small castings, so they are cooled by aging in chill molds. The manufacture of large castings on such a line would require unreasonably large dimensions of the line and the casting cycle.

 The closest analogue is the line for low-pressure injection of automobile wheel disks into metal molds, made in the form of four combined overpasses and placed in pairs, symmetrically relative to the conveyor installed under the overpass, foundry plants, each of which includes a low-pressure injection molding machine with a mold with horizontal connector and with a distributing electric furnace, a manipulator for extracting the casting, a cooling tank with a lowering table for receiving castings and a device for loading castings onto a tram sporter castings move from the manipulator device to the cooling tank provided with means for cutting burr. (A line for casting rims for automobile wheels developed by the South Korean company SAM SUN ENGINEERING CO, 1991). Manipulators of foundry plants in each pair are placed and configured to move castings along the conveyor axis from the center of the molding machine to the periphery of the flyover. Devices for loading castings onto the conveyor are made in the form of hydraulic pushers pushing the castings from the lowering tables of the cooling tanks through the windows in their walls. Because of this, the cooling tanks are located directly near the conveyor and the level of coolant in them must be below the level of the conveyor. In turn, this entails the need to place the cooling tanks at a certain distance from the unloading position of the manipulator and the need for an additional device to move the casting from the manipulator to the lowering table of the cooling tank, made in the form of an inclined roller table. To place the casting on the lowering table of the cooling tank with the runner upward for the purpose of its subsequent unhindered collision on the conveyor, a tilter is installed in the middle part of the roller table. The tool for trimming the flake is placed after the conveyor. The furnaces of injection molding machines are designed for periodic replenishment with the melt, therefore, their loading hatches are turned to the periphery of the flyover and they are large in volume to ensure an acceptable period of operation of the injection machine between loads, during which the injection machine is idle. In addition, due to a decrease in the melt level from casting to casting, the volume above the melt mirror increases and, as a result, the conditions and time of filling the mold change.

 All this negatively affects the productivity, rhythm of the line and the quality of castings.

 When creating the invention - a line for injection molding under low pressure - the task was to increase its compactness and improve service conditions.

 This problem is solved due to the fact that in the proposed line for injection molding under low pressure, made in the form of four combined overpass and placed in pairs, symmetrically relative to the conveyor installed under the overpass, foundry plants, including each low-pressure injection molding machine with a horizontal mold a connector and with a distributing electric furnace, a manipulator for extracting castings and a cooling tank with a lowering table for receiving castings, equipped with means for cutting the flake and a device for loading from the transfer to the conveyor, unlike the closest analogue, the manipulators are made and placed with the possibility of their positioning above the lowering tables of the cooling tanks placed on the side of the device for loading castings onto the conveyor, installed in the flyover window and made in the form of a tray mounted on a vertical guide with its drive movement and the unloading mechanism, and the foundry is placed symmetrically relative to the device for loading the castings on the conveyor.

 In addition, flashing trimmers are placed between the cooling tanks and the device for loading the castings onto the conveyor. On the viaduct there are storage areas for metal ingots, distributing furnaces are equipped with ingots for melting the ingots, and their loading hatches are oriented towards the storage areas and equipped with fast shutters.

 The manipulators are made lever-swivel, and the axis of rotation is placed with the possibility of rotation of the manipulators in the direction of the device for loading the castings on the conveyor.

 This arrangement of line elements minimizes the movement of operators during maintenance and makes it possible to group service four foundries with one operator.

 The implementation of the device for loading castings onto the conveyor in the form of a tray vertically moving from the overpass to the conveyor level and the symmetrical location of the casting plants relative to it allows you to do with one mechanism (instead of four), while the level of coolant in the cooling tanks can be higher than the level of the conveyor (and even above the overpass level), i.e. cooling tanks can be placed with the formation of free space under them, which is used to place auxiliary devices and communications, which makes the line more compact.

 Placing the cooling tanks of foundry plants on the side of the device for loading castings onto the conveyor and the execution and placement of manipulators with the possibility of their rotation and positioning above the lowering tables of the cooling tanks makes it possible to organize the movement of castings without the use of additional mechanisms for their movement (e.g., rolling table) and tilting.

 The compact arrangement of the line elements allows you to place tools for trimming the flake on the overpass, making it possible to trim the flap for operators of foundry machines, and placing funds between the cooling tanks and the device for loading castings onto the conveyor makes it convenient to move castings.

 Placing on the overpass storage sites for metal ingots, supplying distributing furnaces with means for melting the ingots while loading hatches are oriented towards the storage areas and supplying them with quick-acting shutters allows replenishing crucibles of the furnaces with ingots after the operation of pressing each casting without unproductive downtime, using the time required for cooling the press molds with casting, thereby maintaining a constant level of melt before each casting, which provides convenience and improves productivity.

 By maintaining the melt mirror in the crucible at the same level, constant pouring conditions are ensured and, as a result, stable quality and time of the casting production cycle. In addition, with constant replenishment, it is possible to use furnaces with a smaller crucible volume (more than twice), which helps to increase the compactness of the line, reduce the metal consumption of the casting and save energy.

 Execution of the manipulators by lever-swivel and placement of the pivot axes with the possibility of turning the manipulators to the side of the device for loading castings onto the conveyor ensures the transportation of castings from the injection machine to the device for loading castings onto the conveyor, reducing the necessary movements of the operator.

 A known installation for low-pressure molding, comprising a low-pressure injection molding machine with a mold with a horizontal connector, a cooling tank and a mechanism for transporting castings in the form of a cross with a reciprocating drive and step rotation. Castings are fixed at the ends of the crosspiece consoles by means of rods poured into the castings mounted on the consoles. The castings are removed from the working space of the injection molding machine and immersed in the cooling tank due to the reciprocating movement of the cross, and the movement from the injection molding machine to the tank is due to the rotation of the cross. The casting is separated from the transport mechanism by means of a cutting press and a special device for separating the gating residue (ed. St. USSR 442007, IPC B 22 D 17/00, 1972).

 This machine is designed for low-pressure casting of relatively small parts and is not suitable for casting large parts such as automobile wheel disks.

 Also known is a low-pressure casting machine included in the line for casting automobile wheel rims developed by the South Korean company SAM SUN ENGINEERING, CO, 1991 and comprising a low-pressure injection molding machine with a mold with a horizontal connector, with a mechanism for ejecting castings from the top half molds, a manipulator for removing castings with a horizontally moving receiving bowl, a cooling tank with a lifting and lowering carriage with a drive installed in it, on which a table for receiving the casting is mounted.

 The cooling tank is installed at a certain distance from the position of unloading the manipulator, an inclined roller table is installed to move the casting from this position to the table for receiving castings, and for loading the casting from the manipulator to the roller table, the receiving bowl of the manipulator is equipped with a tilt mechanism. This setting is the closest equivalent.

 Due to the fact that the castings have a sprue located below and it is an obstacle to further movements of the casting, a tilter is installed in the middle part of the roller table. When manipulating the casting (when loading onto the roller table, moving it over, turning over, loading onto the receiving table of the cooling tank), removed from the mold in a rather plastic state, the surface of the casting is damaged.

 When creating the invention - the installation for casting under low pressure - the technical task was to simplify the design of the installation and improve the quality of the casting.

 The problem is solved in that in the installation for molding under low pressure, containing a low-pressure injection molding machine with a mold with a horizontal connector, with a mechanism for pushing the casting from the upper half-mold, a manipulator for removing the casting with a horizontally moving bowl, a cooling tank with it installed a lifting and lowering carriage with a drive on which a table for receiving the casting is mounted, unlike the known manipulator, is configured to position the receiving bowl above the table for receiving the casting, in at the bottom of the receiving bowl, a cut is made and a slit open towards the tank, the table for receiving the casting is made in the shape of a cut and mounted on the carriage by means of vertical racks located within the width of the slot, and the carriage drive is configured to raise the table above the level of the manipulator receiving bowl.

 In addition, the table for receiving the casting is provided with cavities for accommodating the protruding parts of the casting.

 The positioning of the receiver bowl of the manipulator above the table for receiving the casting of the cooling tank allows the casting to be moved to the table without the use of additional transport means, which simplifies the design of the foundry installation.

 Providing the bottom of the receiving bowl with a cutout and making the table for receiving the casting in the shape of this cutout improves the accuracy of placing the casting on the table, and the carriage drive with the possibility of lifting the table above the level of the receiving bowl of the manipulator allows you to carefully transfer, and without undesirable mechanical influences, the extracted from the mold in a rather plastic state, the casting, which increases its quality.

 A slot open to the side of the tank in the receptacle of the manipulator and vertical racks located within its width, with which the casting receiving table is mounted on the carriage, allow the manipulator's receiving cup to be withdrawn when it moves back from under the table with the casting raised to the upper position, which reduces the dimensions of the installation and allows you to automate the process of moving the casting between operations.

 The presence of the sprue on the casting violates the stable position of the casting on the table; to avoid this, it can be provided with cavities for placing the sprue, which eliminates the need for tilting of the casting, and this simplifies the design of the installation (the tilter is not needed) and improves the quality of the casting.

 A device for removing castings from the working area of an injection molding machine is made in the form of a platform for receiving castings mounted on the end of an L-shaped lever equipped with a rotary drive (ed. St. USSR 1178536, B 22 D 15/04, 1983).

 In this device, the platform for receiving castings moves along an arc of a circle, which requires a large clearance between the elements of the bed of the injection molding machine for its passage.

 The closest analogue is the manipulator, which is equipped with a low-pressure casting line foundry, developed by the South Korean company SAM SUN ENGINEERING CO, 1991, made in the form of an articulated four-link containing a base mounted on a support, two cranks mounted on the base, free ends connected with a connecting rod, on the cantilever part of which a receiving bowl is installed, and equipped with a rotation drive connected to the axis of the driving crank. The links of the articulated four link in this manipulator are placed in the same plane.

 This design of the manipulator allows you to remove the receiving bowl of the manipulator with casting from the working area of the injection molding machine on a gentle curve, providing the minimum necessary clearance between the elements of the bed of the injection molding machine, but the stroke of the receiving bowl is limited by the interaction of the links of the articulated four-link unit, which does not allow the casting to be moved to a distance necessary to place it in a cooling tank, on a conveyor, on a vehicle or for other purposes.

 The technical task is to increase the working stroke of the manipulator in order to ensure the possibility of moving the casting a considerable distance from the injection machine, for example, to the cooling tank, without involving additional funds and devices.

 This problem is solved due to the fact that in the manipulator for moving castings, made in the form of a four-link hinge, containing a base mounted on a support, two cranks mounted on a base, connected with a free end to a connecting rod, on the console part of which there is a receiving bowl, and equipped with a drive the rotation associated with the axis of the leading crank, in contrast to the known base is made rotatable relative to the support and it is equipped with a means of ensuring the sequence of rotation of the articulated four-link ika relative to the base and relative to the support base.

 In addition, the manipulator is equipped with a common rotary drive of the articulated four-link and base and a position lock of the base relative to the support or the leading crank, and the lock is made with the possibility of communication with the support and, at the same time, breaking the connection with the leading crank and vice versa.

 The base of the manipulator is made with the axis of rotation coinciding with the axis of the driving crank, the support is in the form of a cylinder coaxial with it, and the latch is in the form of a two-shoulder lever mounted on the base and spring-loaded towards the support, on one shoulder of which there is a protrusion interacting with the socket in the support, and on the other shoulder, a groove interacting with a finger mounted on the leading crank, and the base is provided with a stop placed to interact with the finger at the groove level of the two shoulders of the lever in the exit position of its protrusion s nest support.

 Performing the base of the manipulator pivoting relative to the support and providing it with a means of ensuring the sequence of rotation of the articulated four-link relative to the base and base relative to the support allows the movement of the receiving bowl along a gentle curve to complement the movement along the circular arc due to the rotation of the base with the four-link relative to the fixed support.

 The design of the manipulator is simplified by using one common drive to rotate the four link and the base, for which the manipulator must be equipped with a position lock of the base relative to the support or the leading crank, and the lock is made with the possibility of communication with the support and, at the same time, breaking the connection with the leading crank and vice versa.

 The simplest, from the applicant’s point of view, the design of the manipulator will be, when the base is made, with the axis of rotation coinciding with the axis of the driving crank, the support is in the form of a cylinder coaxial to it, and the latch is in the form of a two-shouldered lever mounted on the base and spring-loaded towards the support, on one the shoulder of which is made a protrusion, interacting with the socket in the support, and on the other shoulder, a groove interacting with a finger mounted on the leading crank, and the base is equipped with a stop placed with the possibility of interaction with the palm it at the level of the slot a double-arm lever in its release position, the protrusion of the socket support.

In FIG. 1 is a plan view of a low pressure die casting line; figure 2 is a foundry installation, a section along aa in figure 1; figure 3 - manipulator in the initial position and at the time of positioning above the table to receive the casting of the cooling tank (dashed lines); in FIG. 4 - manipulator, view B in FIG. 3; figure 5 and 6 - the fixation of the position of the base relative to the support and crank, remote element In figure 4
The low-pressure casting line (see Fig. 1) is made in the form of four foundry plants I, united by a common flyover 2 and placed in pairs, symmetrically relative to the conveyor 3 installed under the flyover. Each foundry installation includes a low-pressure injection molding machine 4 with a transfer furnace 5 with a mold with a horizontal connector between the punch 6 and the die 7, a manipulator 8 for extracting the casting, a cooling tank 9 with a lowering table 10 for receiving the casting 11. The line is equipped with means 12 for trimming the flake and device 1 3 for loading castings onto a conveyor. For each installation, cooling tanks 9 are placed on the side of the device 13 for loading castings onto a conveyor installed in the flyover window 14 and made in the form of a receiving tray 16 mounted on a vertical rail 15 with a hydraulic drive 17 for moving it and an unloading mechanism 18. The unloading mechanism is equipped with a copier mounted on a vertical guide, which ensures the inclination of the receiving tray 16, when approaching the conveyor 3, to the angle required for rolling the casting.

 The manipulator 8 is made and placed with the possibility of positioning above the lowering table 10 of the cooling tank 9. Foundries I in the line are placed symmetrically to the device 13 for loading the castings on the conveyor.

 For trimming the flake, any suitable means can be used, for example, a cutting press or, in the simplest case, a work table with the necessary set of tools and devices - a table for clipping the flake. Means 12 for trimming the flake can be placed, for example, next to or after the conveyor 3.

 It is most expedient to place the means for cutting the flake between the cooling tanks and the device for loading the castings onto the conveyor.

 To replenish the transfer furnace with a melt and to maintain a constant level of the melt, various devices can be used, for example, in the closest analogue, the melt is obtained in melting furnaces outside the line and brought in a ladle, it is also possible to use an additional furnace to melt metal ingots located next to the transfer furnace and the piping system connected to it with hermetic closures.

 It is most simple and convenient to load the ingots directly into the distributing electric furnace periodically during breaks between the operations of pressing the castings. For this, platforms 19 for storing metal ingots are placed on overpass 2, electric transfer furnaces 5 are equipped with means (not shown in the sketch) for melting metal ingots, and their loading hatches 20 are equipped with quick-acting shutters 21 with a hydraulic, mechanical or manual drive. This ensures that the transfer furnace is loaded with metal ingots without increasing the casting production cycle, using the time required to cool the mold with the casting.

 The castings can be moved from the injection machine 4 to the cooling tank 9 and then to the conveyor 3, for example, using a manipulator located on load-bearing structures installed near the foundry installation, or, as in the closest analogue, a manipulator in combination with additional devices (roller table) .

 The design is the simplest and most compact when executing manipulators 8 lever-rotary with the placement of their axes with the possibility of rotation in the direction of the device 13 loading the castings on the conveyor. Thus, the transfer of castings from all four injection molding machines to the loading area on the conveyor by one device is ensured.

 Cooling tanks are containers with running water installed and fixed on the foundation on struts-supports 22. Inside the tanks along the vertical rails 23 a lifting and lowering carriage 24 is equipped with a hydraulic actuator 25 (see Fig. 3), on which on the vertical racks 26 set table 10 for receiving castings. The manipulator 8 is configured to position the receiving bowl 27 above the table 10 for receiving castings. A cutout 28 is made in the bottom of the receiving bowl and a slot 29 is open toward the cooling tank 9, and the table 10 is made in the shape of the cutout 28. Vertical struts 26 are placed within the width of the slot 29, and the drive of the lifting and lowering carriage 24 is configured to raise the table for cooling castings above the receiving bowl 27.

 To orient the castings by runner up, a tilter can be used, as in the closest analogue.

 In the present invention, the table 10 for receiving castings is provided with cavities 30 for accommodating the protruding parts of the casting, for example, the gate, which eliminates the need for tilting of the casting.

 The manipulator 8 is made in the form of an articulated four-link containing the base 32 mounted on the support 31, two cranks - the leading 33 and the follower 34, mounted on the base and free ends connected with the connecting rod 35, on the console part of which the receiving bowl 27 is installed. The manipulator is equipped with a rotation drive 36 associated with the axis of the leading crank, and is equipped with a means of ensuring the sequence of rotation of the articulated four-link relative to the base and base together with the articulated four-link relative to the support (see figure 4 , 5).

 The means for ensuring the sequence of rotation of the articulated four-link relative to the base and the base with it relative to the support can be performed, for example, with two drives that perform each of their turns with the sequence of switching on the drives from the control system.

 In the proposed design, the manipulator 8 is equipped with a common drive 36 for rotating the articulated four link and the base 32 and a position lock of the base relative to the support 31 or the leading crank 33, and the latch is configured to provide communication with the support and, at the same time, break the connection with the leading crank and vice versa. For this, any suitable known mechanism may be used.

 The simplest, from the applicant’s point of view, the design of the manipulator will be, if the base 32 is made with the axis of rotation coinciding with the axis of the driving crank 33, the support 31 is made in the form of a cylinder coaxial with them, and the latch is installed in the form of a base 32 and spring-loaded to the side support 31 of the two shoulders of the lever 37, on one shoulder of which a protrusion 38 is made, interacting with the socket 39 in the support, and on the other shoulder, a groove 40, interacting with the finger 41, mounted on the leading crank 33, the base is equipped with a stop 42 (see Fig. 5, 6). The emphasis 42 is installed in such a way that it interacts with the finger 41 at the level of the groove 40 in the exit position of the protrusion 38 from the socket 39 of the support 31.

 The line works as follows.

 Before the start of the process, the distributing furnaces 5 are filled with molten metal to the required level, quick shutters 21 of loading doors 20 of injection molding machines 4 are open, a metal ingot for preliminary heating is located in the loading door tray (not shown in the sketch). The punch 6 of each foundry 1 is raised to its highest position. The manipulators 8 are in the initial position, the lowering tables 10 of the cooling tanks 9 are in the lower position, and the receiving tray 16 of the device 13 for loading the castings onto the conveyor is raised to the upper position. Conveyor 3 is running. The base 32 of the manipulator is fixed relative to the support 31, the protrusion 38 of the lever 37 is located in the groove 39 of the support 31.

 Foundries are launched sequentially after the caster presses the “start cycle” button on the control panel (not shown in the sketch). A quick shutter 21 closes the loading hatch 20, the punch 6 lowers to the lower position and closes with the die 7, excess air pressure is supplied to the distributing electric furnace 5, a part of the molten metal is extruded into the mold, after a certain time required to fill and form the casting, excess pressure is released. The shutter 21 is triggered and the loading door 20 opens, the preheated metal ingot located on the loading door tray is fed into the transfer electric furnace, and in its place the caster puts the metal ingot from the storage area 19. The frequency of loading is determined by the weight of the casting according to the technological process.

 The punch 6 with the casting 11 rises above the receiving bowl 27 of the manipulator 8 and stops. The drive 36 of the manipulator 8 is turned on, turning its leading crank 33 together with the driven crank 34 and the connecting rod 35 on the fixed base 32 into the open mold of the injection machine 4 until the receiving cup 27 is under the casting 11. The casting 11 collides with the punch into the receiving section 27, and the punch 6 rises to its highest position. The drive 36 is turned on in the opposite direction, and the receiving bowl 27 with casting 11 exits from under the punch and moves along a gentle curve towards the cooling tank 9. Passing through the initial position of the manipulator, the leading crank 33 with his finger 41 enters the groove 40 of the two shoulders of the lever 37 and, overcoming the resistance of the springs, turns it around its axis and reaches the stop 42 on the base 32, at the same time the protrusion 38 completely leaves the groove 39. The base 32 is unlocked relative to the support 31. The leading crank 33 interacts with the base 32, turning it around its axis. The receiving bowl 27 of the manipulator 8 with casting 11 along the radius curve moves to the cooling tank 9 and is positioned above the center of the lowering table 10. The hydraulic actuator 25 is turned on, lifting the lifting and lowering carriage 24 along the vertical guides 23, while the lowering table 10 passes through the cutout 28 in the bottom the receiving bowl 27, picks up the casting 11, while the casting gate is located in the cavity 30, raises it above the receiving bowl 27 and stops in this position. The drive 36 is turned on, turning the driving crank 33 in the opposite direction, which in turn acts with the finger 41 through the groove 40 on the lever 37, turning the base 32 towards the injection machine 4 and brings the receiving bowl 27 of the manipulator from under the lowering table 10 with casting 11, vertical posts 26 pass into the slot 29. Upon reaching the initial position of the manipulator 8, the drive 36 is turned off, while the protrusion 38 reaches the groove 39 and, under the action of the springs, enters it, fixing the base 32 relative to the support 31. The hydraulic drive 25 is turned on, lifting the multi-lowering carriage with the lowering table 10 and the casting 11 placed on it lowers to the lower position, immersing the casting in water, and stops. After cooling the casting, the time of which is determined by the technical process, the hydraulic actuator 25 is turned on and the lifting and lowering carriage with a table raises the casting to the level of the flyover. The caster manually shifts the casting to the flashing cutter 12, removes the flake and also manually shifts the casting to the receiving tray 16 of the device 13 for loading the castings onto the conveyor. The hydraulic drive 17 is turned on, which along the vertical guide 15 lowers the receiving tray 16 with casting 11 through the window 14 in the overpass 2 to the copier 18, the tray tilts, the casting collides on the conveyor 3 and moves it outside the overpass 2, and the receiving tray 16 is returned by the hydraulic drive 17 to starting position and ready to accept casting from the next foundry plant.

Claims (9)

 1. A line for low-pressure casting, made in the form of four, united by a common flyover and placed in pairs symmetrically relative to the conveyor installed under the flyover, foundry plants, including each low-pressure injection molding machine with a mold with a horizontal connector and with a distributing electric furnace, a manipulator for extraction of castings and a cooling tank with a lowering table for receiving castings, and equipped with means for trimming the flake and a device for loading the castings on the conveyor, characterized in that the coolers are made and placed with the possibility of their positioning above the lowering tables of the cooling tanks placed on the side of the device for loading castings onto the conveyor installed in the flyover window and made in the form of a tray mounted on a vertical guide with a drive for moving it and an unloading mechanism, and the foundry plants are placed symmetrically regarding a device for loading castings onto a conveyor.  2. The line according to claim 1, characterized in that the means for trimming the flake are placed between the cooling tanks and the device for loading the castings onto the conveyor.  3. The line according to claim 1, characterized in that the platforms for storing metal ingots are placed on the overpass, the transfer furnaces are equipped with means for melting the ingots, and their loading hatches are oriented towards the storage areas and equipped with fast-acting shutters.  4. The line according to claim 1, characterized in that the manipulators are made in the form of articulated four-link chains and can be rotated towards the device for loading castings onto the conveyor.  5. Installation for low-pressure molding, comprising a low-pressure injection machine with a mold with a horizontal connector and a mechanism for pushing the casting from the upper half-mold, a manipulator for extracting the casting with a horizontally moving receiving bowl, a cooling tank with a lifting and lowering carriage with a drive on which a table for receiving the casting is installed, characterized in that the manipulator is configured to position the receiving bowl above the table for receiving the casting, in the bottom of the receiving bowl are made cut and open towards the slit of the tank, for receiving the casting table cutout is shaped and mounted on the carriage by means of vertical uprights disposed within the width of the slot, and the carriage drive is configured to lift the section above the level of the reception bowl of the manipulator.  6. Installation according to claim 5, characterized in that the table for receiving the casting is made with cavities for accommodating the protruding parts of the casting.  7. A manipulator for moving castings, containing a four-link articulated shaft, including a base mounted on a support and a driven and driving cranks mounted on a base and connected to the connecting rods with free ends, a receiving bowl mounted on the connecting rod console part, and a rotation drive connected to the axis of the driving crank characterized in that the base is made rotatable relative to the support, and it is equipped with means for ensuring the sequence of rotation of the articulated four link relative to the base and base tion support.  8. The manipulator according to claim 7, characterized in that the rotation drive is made common for the articulated four link and the base and is equipped with a position lock of the base relative to the support or the leading crank, the locking device being configured to provide communication with the support and at the same time break the connection with the leading crank and vice versa .  9. The manipulator according to claim 8, characterized in that the base is made with a rotation axis coinciding with the axis of the driving crank, the support is in the form of a cylinder coaxial with them, and the latch is in the form of a two-shouldered lever mounted on the base and spring-loaded towards the support, on one shoulder of which has a protrusion interacting with the socket in the support, and on the other shoulder is a groove interacting with a finger mounted on the leading crank, the base provided with a stop placed to interact with the finger at the groove level of the two shoulders lever exit position its protrusion from the slot support.

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