DE2119071A1 - Casting duroplast mould core - in inner and outer moulds with ejector rod - Google Patents

Abstract

An appts. for mfg. hollow mould core from thermosetting materials comprises a feed mechanism for introducing the thermoplastics into a core forming mould (I) a furnace, and an ejector mechanism for removing the core from (I). (I) comprises an outer mould with a central hole in its base, a disc, also with central hole, which sits inside the outer mould, the two holes being coaxial and an inner mould, with its central hole continuing as a truncated pipe to fit inside the other two holes. In this assembled position, the inner and outer moulds are located with the disc between their bases, so that, the core is formed in the space between them. The ejector mechanism comprises a rod with two successive abutments so arranged that when the rod is moved upwards, the first abutments lifts out the inner mould from the cast core, while the second abutment lifts out the cast core and the disc beneath it. When these two groups have been raised clear of the outer mould, the inner mould is removed and the core separately removed, while the disc is ready for return into the outer mould.

Description

PLANT FOR MANUFACTURING HOLLOW MOLD CORES FROM WARM-HARDENING MASS The invention relates to systems for the production of hollow mold cores thermosetting compounds and can æ.B. in the manufacture of sleeves for sewer pipes Find application. The proposed plant for mass production is no less successful of products made from plastic that harden in heated open molds will.

There are single-stage systems for the production of cores from thermosetting Masses known with the help of heated core boxes, into which the mass from above is entered here, the filling of the box with mass in its full volume he follows. After the polymerization and the Formation of the nuclear envelope will the box turned around 1800. The excess of unreacted mass is poured out, which is pushed out of the box after hardening and the cycle. repeated. These systems require constant supervision Operator over each box and are also little efficient as that Operator gives a certain time for polymerisation and hardening of the mass and required for necessary work operations for blowing off and lubricating the box is to wait.

In addition, there are systems for the production of hollow mold cores from thermosetting Masses known which a device for feeding the mass into the core boxes, a furnace for heating the core boxes and a device for ejecting the cores from the box, the latter having a drive rod which in a provided in the box bottom opening engages and from the box the core and a Insert with a hole placed on the bottom of the box, the one with the opening in the bottom of the box is equiaxed, pushes out (VdSS # Copyright certificate 123674) In these systems the core box is screwed onto a rotating spindle. Are around the box arranged electric heating coils. The mass is made by means of a special dispenser in a predetermined amount in the rotating, closable by a lid Core box introduced. Under the influence of the centrifugal force the mass is distributed around the periphery of the box. after a certain period of time the rotating core box is stopped and the cover is swiveled out by a gripper. The rod that goes through the spindle pushes the cash out of the cash register Core and the insert disk # The core is discharged onto a conveyor, the rod returns to the starting position and places the disc on the bottom of the box. Of the The box is being prepared for the next cycle (blowing off, sprinkling), from which the cycle repeats itself.

When producing cores on this system, however, the lower core part thickens because the mass is unevenly distributed in the box, which leads to overconsumption of the mass.

In addition, the system is not very efficient because all work processes of the technological process carried out successively in one position will.

The purpose of the present invention is to eliminate the aforementioned Disadvantage.

The invention is based on the object of a plant for production of hollow mold cores made of thermosetting material to create higher performance owns, all unproductive expenses reduced to a minimum and a full Ensures automation of the technological process.

The task at hand is given by the fact that in the system for the production of hollow mold cores from thermosetting materials, which a device for feeding the mass into the core boxes, an oven for heating the core boxes and includes a device for ejecting the cores having a drive rod, which goes into an opening provided in the bottom of the box and the core out of this Box and one placed on the box bottom, designed as a disc The insert pushes out, the hole coaxial with the opening in the bottom of the box has, according to the invention, the box with a limiting the thickness of the core walls central insert is provided, which has a shaft through the Hole in the disc can be inserted into the opening in the bottom of the box and the central insert adjusts coaxially with the box with the drive rod arranged vertically and has two stops, which when the drive rod moves upwards Separate the inserts and bring them to different heights from which the upper stop for holding the central insert when it is ejected set up from the core and the lower stop for holding the core and the Disc be # ejecting the same from the box is suitable, whereby in the high altitudes, in which the stops are at maximum extension of the rod, devices are attached, which when the rod decreases for the removal of the central insert and the gist of their attacks as well as the subsequent ones handing over and lowering the central insert into the core box.

The equipment of the box with the central insert is guaranteed an even corner of the core walls creates the possibility for the polymerisation acceleration the thermosetting mass and allows the amount of this mass to be kept to a minimum reduce the process of disassembling and assembling the core box and that Automate removal of the finished core from the plant.

It is desirable that the shaft of the central insert has a recess which is congruent to the shape of the upper stop of the rod.

This allows the top stop of the rod #. ' unhindered in the To engage the shaft recess and the central insert Veim lifting the rod to hold on reliably.

Appropriately, the upper stop of the rod is in the form of a Cone and the lower stop formed as a shoulder, the diameter of which the the maximum diameter of the upper stop and the disk hole.

In this execution of the attacks, the act of suspension of the finished core with the process of pushing out the insert pieces of the box combined in time.

It is useful that the device, which the central insert lowers into the core box, consists of a vertically arranged drive rod, which has a stop that the upper stop of the rod of the device for Core ejection from the box is similar.

This design of the device ensures an automatic Assembling the box.

It is useful to use the device for removing and handing over the central insert of two two-armed levers that can be pivoted in a horizontal plane, one of which End over the ejector for the cores and the others over the device for lowering the central insert in the core box, as well as two Form pairs of guides, .welchs arranged one above the other between the levers are and in which a sliding piece with an opening is attached in the lower guides is that exceeds the dimension of the central insert, while the upper Pair of guides is set up so that there are central inserts on them can move that reach these guides through the opening in the slider, wherein the slider is provided with two stops that are on both sides of the Opening along the upper guides and one of which is immobile and serves to move the central insert over the upper guides and the others a bevel. has, in a vertical plane - rotatable is unö to move of the other egg insert located on the upper guide is used, with the Ends of the two-quiet armed lever # are attached, which are used to hold the central inserts in place before it was shifted over the upper sensations and after this shift are determined.

This supply of the device for acceptance and transfer of Central insert allows the core box to be dismantled at the same time to make in one position and its assembly in the other position, whereby <considerably> the time to manufacture Kerner #> is reduced.

It is advisable to use the device for the removal and transport of the Core in the form of a pivotable lever with a gripper at its end and a fixed stage arranged under this hayloft on it back and forth movable plunger, which with the core at its Remove from the plant cooperates.

The gripper of the pivotable lever can be in the form of a <> #> Be designed as a flat spring. <U-shaped BeboSen # fl> This version the gripper ensures that finished hollow cores of different dimensions be held.

The proposed system has a high level of performance because the whole technological process of making cores in a series of short-term Main and auxiliary operations are divided, which are carried out simultaneously, the idle times of the devices with the execution of the main technological operations are folded sideways.

The system is compact, structurally simple, reliable and safe to operate.

In addition, the efficiency of the system increases by 4th up to 5 times that of known systems and achieved under real operating conditions 150-180 cores per hour.

The technical possibilities of the system amount to 220-240 Cores per hour, whereby only one operator is responsible for controlling the system is required.

In the following the invention will be described by describing an exemplary embodiment of the plant with reference to the drawings, Fig. 1 shows the overall view the system according to the invention for the production of hollow mold cores from thermosetting Masses in three-dimensional representation with partial section; Fig. 2 the same system in plan view; 3 shows a core box in the system in the assembled state, ~ lengthways cut; 4 shows the same in the disassembled state; Fig. 5 the device for Acceptance and handover of the central insert of the system, spatial representation 6 shows the ejection device for the cores and the lowering device for lowering of the log-in pieces in the core box when they interact with the device for the acceptance and handover of the inserts.

The plant for the production of hollow mold cores from a thermosetting Mass possesses a device 1 (Fig. ~ 1) for the feeding of the Mass in kerK boxes 2 and an oven 3 for heating the kernel boxes X To move the core boxes 2 from the device 1 through the furnace 3 and back to the device 1 a device 4 for conveying the core boxes 2 is provided. This device 4 contains two parallel rows of roller tables arranged in a horizontal plane 5, which on one side by a drive carriage 6 and on the other side by a fixed stage 7 (Fig. 2) can be removed.

The Vorriohtang 4 is so snendet that the first row of Roller tables 5 through the oven 3 and the second row parallel to the oven and under the Device 1 for the supply of the mass runs.

The carriage 6 moves perpendicular to the direction of movement of the boxes 2 on the roller tables 5.

A little above the roller tables 5, three plungers 8, 9 and 10 are attached, of which two 8 and 9 perpendicular to each other near the device 1 for the Supply of the mass are arranged. Here, the plunger 8 is used to move the Kertkastens 2 from the second row of roller tables 5 over the fixed stage 7 in the direction from the device 1 to the furnace 3, while the ram 9 for Moving the core box 2 into the furnace 3 is used. The plunger 10 is located in the vicinity of the second row of roller tables 5, namely along this row and is intended for moving the core box 2 from the carriage 6 to the second row of roller tables #.

The core box 2 (Fig. 3 and 4) is provided with insert pieces, which limit the thickness of the core walls, one of which on the one opening 11 having box bottom is placed, and a disk 12 is. Latter has a hole 13 which is with the opening 11 of the box 2g1eichachs # g. That Another insert is the central insert 14 and has a shaft 15, which when assembling the box through the hole 13 of the disc 12 in'die opening 11 of the box 2 goes in and the insert 14 is coaxial with the box 2 sets. This' construction of the box 2 ensures a uniform Thickness of the core walls creates the possibility of accelerating the polymerization thermosetting mass' and reduces the effort of this mass to a minimum.

Under the second row of roller tables 5 (Fig. 1) there is one Device 16 for ejecting the kernels from the box 2, which has a vertically arranged Drive rod 17 (Fig. 6) contains which goes freely between. The rod 17 is zenit two 'stops 18 and' 19 ver-17, which during the upward movement of the Rod the E, i, nlegestücke 12 and. 14 and separate them at different altitudes bring. The upper stop 18 is for holding the central insert 14 at set up its ejection from the core, while the lower stop 19 for retention the Schei- and the @@ ms be 12 # when ejecting the same from the box 2 is.

The stop 18 is a cone and the lower stop ' 19th designed as a paragraph, the diameter of which is the maximum diameter of the upper Stop 18 and the maximum diameter of the hole 13 of the disc 12 exceeds. The shaft 15 of the central insert 14 has a recess 20 (Fig. 4), which is congruent to the shape of the upper stop 18 of the rod 17.

In the dhenlzgen in which the stops 18 and 19 are at the maximum From thrust of the StaReß 17, a device 21 (Fig. 1) are accordingly to remove the central insert 14 from the stop 18 and to transfer the-4r same for device 22, which lowers that central insert in the core box Z, and a device 23 for removing and conveying the core is mounted.

The device 21 for removing and transferring the insert is located is above the second row of roller tables 5 and consists of two in whale-fair Level pivotable two kind of levers 24 (Fig. 5) and two pairs of E'Uhrungen 25 and 26, which are arranged between the levers 24 one above the other. The levers 24 are arranged in such a way that the one ends thereof are above the device 16 for ejecting the cores and the others via the device 22 which the Zen-4r traleinlegestück lowers in the core box, are located at the ends of the two-armed Lever strips 27 are attached, which serve to hold the insert pieces 14 in place. Here, the two-armed levers 24 are provided with a pneumatic drive, which ensures their pivoting in a horizontal plane.

In the lower pair of guides 26 a slider 28 is underg, ebracht, which is equipped with a pneumatic drive 29. The slider 28 has an opening 30, the dimension of which exceeds that of the central insert 14.

The upper pair of Fülarungen 25 is for moving insert pieces 14 set up on the same, which on the guides 25 through the opening of the Slider 28 arrive. Here, the slider 28 has stops 31 and 32 provided, which are mounted on both sides of the opening 30 along the upper guides 25 are.

The stop 31 is stationary and serves to move the insert piece 14 on the guides 25, while the stop 32 is rotatable about the same on an axis 33 is attached and for moving other inserts located on the guides 25 serves. The stop 32 has a bevel 34 which allows that when Reverse gear of the slider 28, the stop 32 unhindered under the shaft 15 of the insert 14, which is located on the guides 25, arrives and under ' the pressure of the latter is rotated about the axis 33.

The device 22 (Fig. 1), which the central insert min the Core box 2 is located under the second row of roller tables 5 and contains a vertically arranged drive rod 35 with a stop 36, which the Stop 18 is similar. As a drive for the rods 35 and 17 is a pneumatic drive 37 is used.

The device 23 for removing and transporting the core contains a pivotable lever 38 with a flat spring located at its end formed gripper 39 and a stationary stage 40 arranged below the pivotable lever 38 with a plunger 41 moving back and forth on this. The latter is fastened to the carriage 6 and cooperates with the core 42 when it is removed from the system.

The system is controlled by a control panel and limit switches (from Fig. not visible) controlled, on whose signal the devices 1, 21, 22, 23 automatically trot in function. The direction of movement of the boxes in the plant is shown in the figures indicated by arrows.

r The proposed system is operated as follows.

The core boxes 2 (Figs. 1, 2) previously heated in the furnace 3 and in which inserts 12 and 14 are housed, are close to each other the roller tables 5 set up.

The core box 2, which is located under the feeding device 1, is pressed against the head and into the cavity through the box walls and the central insert 14 is limited, the thermosetting composition # n is given. After the box 2 has been filled with the mass, it is lowered onto the Hollgang 5. Meanwhile the drive kicks in of the plunger 8 in action. The latter moves the box 2 filled with the mass to the furnace 3, while the ram 9 the box 2 moved into the oven-3, where the hardening of the mass takes place. Here is the time required for the mass to polymerize and for the core to form depends on the quality of the mass and the thickness of the core. The boxes with the finished cores 42 are pushed out of the furnace 3 through the next box, which, after being filled with the mass, is placed in the furnace³.

The box 2 with the finished core 42 is pushed out onto the carriage 6. this time the drive of the carriage 6 comes into action and this moves to second row of roller tables 5. After the carriage 6 has stopped, the ram '10 is in Activity set, which moves the box from the carriage 6 to the second row of roller tables. As soon as the box 2 with the finished core 42 is in its position above the device 16 has taken to eject the cores, the drive 37 of the rod 17 enters Function. During the upward movement of the rod 17, its stop 18 goes into the recess 20 of the insert 14 and lifts it out of the. Core 42 from, during the The lower stop 19 presses against the disk 12 and lifts it together with the core 42. In this way, the central insert 14 and during a rod stroke the insert disk 12 with the core 42 lifted out of the core box 2, separated and arranged at different heights.

When the rod 17 is pushed out to the maximum, the central insert occurs 14 (Fig. 5) in the opening 30 of the Gleitstüoks 28 and adjusts itself so that the shaft 15 is at the level of the stop 31 of the slider 28. Meanwhile occur the drive to pivot the two-armed lever 24 and the drive of the pivotable Lever 38 (Fig. 1) in action. The two-armed levers 24 are in a horizontal position Level pivoted in such a way that its ends located above the rod 17 are pushed together while the ends located above the rod 35 diverge. the Bars 27 attached to the ends of the two-armed levers 24 hold the shaft 15 of the central insert 15 fixed and the gripper 39 of the pivotable lever 38 is detected the core 42.

The drive for the backward movement of the rod 17 is then switched on, and as soon as the upper stop 18 has left the recess 20 of the shaft 15, the drive 29 for moving the slider 28 (FIG. 5) comes into operation.

The latter moves in the lower guides 26 while its fixed stop 31, which rests on the shaft 15, the central insert 14 first along the strips 27, which are attached in such a way that they are pushed together when Ends of the two-armed levers 24 as an extension of the upper pair of guides 25 serve, and then moved over the guides.

The movable stop occurs when the slide is reversed 32 with its bevel 34 under the central iniq insert # tück, is under action of the latter rotated about the axis 33 and occurs under the central insert 14 unhindered by.

When the rod 17 is returned to the starting position, the Core 42 (FIG. 1) retained by gripper 59. As soon as the upper stop 18 has left the core 42, the drive of the pivotable lever 38 comes into action and the latter moves when it is pivoted into the starting position above the fixed stage 40 (Fig. 2).

The core 42 comes against the ram located above the stage 40 41 to the system. During this time, furnace 3 becomes the next core box knocked out on the carriage 6. The carriage6, which is located in the for moving the Moves core boxes in the furnace vertical direction, moves the ram 41, which in turn the finished core 42 is moved on the fixed stage 40 and bunker inside it throws. During the movement of the carriage 6, the rod 17 returns completely into its Return to the starting position by lowering the disc 12 to the bottom of the box 2. In the subsequent cycles of lifting the rod 17, work operations which are analogous to those described above.

When moving the next central insert through the Stop 31 (Fig. 5) is located on the guides 25 Zentraleinlegestücv moved by the movable stop 32 and then stops above the rod 35. The lifting of the rods 17 and 35 takes place simultaneously. Once the central insert 14, which is moved by the fixed stop, the strips 27 of the two-armed Lever 24 leaves and on the guides 25 occurs, the Lever 24 pivoted so that their ends located above the rod 17 to Take apart a 4q subsequent central insert while the ends located above the rod 35 are pushed together y and the central insert # Hold over the rod 35.

During this time, the stop 36 of the rod 55 goes into the recess 20 of the shaft 15 into it, while through the opening 30 of the slider 28 a next the following slide 14 passes through. The two-armed levers 24 are in turn pivoted and their strips 27 capture the bejindliche on the stop 18 of the rod 17 Central insert, while those attached to the opposite ends of the levers 24 Bars 27 diverge by releasing the central insert.

The lowering of the rods 17 and 35 also takes place at the same time, the rod 17, the disc 12 in the core box and the rod 35 the central insert 14 lowered into box 2. Here, the shaft 15 (Fig. 3) of the insert goes 14 through the hole 13 of the disc 12 into the opening 11 in the bottom of the box 2 and centers the insert 14 with respect to the box during the lowering of the both rods 17 (Fig. 1) and 35 are operations for filling the core box 2 with to to the earth, its moving into the oven 3 and ejecting the box znit made the finished core from the furnace 3.

The ejection operation of the core 42 from the core box 2 is carried out with the Pushing out the central insert 14 and the disk 12 are combined in time. At the same time, the rod 35 is used to remove the central insert 14 and subsequent Lowering the same in the core box 2 moved upwards.

The operations # of moving the finished core 42 are carried out with the Process of moving the central insert 14 on the upper guides 25 in time merged.

The process of moving the carriage 6 with that which has emerged from the furnace 3 Box 2 begins the process of moving a finished core 42 out of the facility combined in time.

The process of conveying the core box 2 to the device for Ejecting the core from the same becomes with the process of moving the core box merged into the position in which the core box 1 supplied the mass will.

In this way, the technological Processes a high efficiency of the system achieved.

Claims (7)

PATENT CLAIMS: @ Plant for the production of hollow shaped beads from thermoreactive Masses, a device for feeding the mass in core boxes, an oven to Heating the core boxes and a device for ejecting the cores from the box contains, which has a drive rod which is provided in a box bottom opening goes in and out of the box the core and one placed on the box bottom, designed as a disc with a hole coaxial with the opening in the box bottom Inlay protrudes, that d u r c h, g e k e n n n z e i 0 h n e t that the Core box (2) with a central piece delimiting the thickness of the core walls (14) is provided which has a shaft (15) which passes through the hole (13) of the Disc 2) in the opening (11) of the bottom in the box (2) is a guide bar and that Central insert (14) adjusts simultaneously with the box (2), with the drive rod (17) is arranged vertically and has two stops, which during the upward movement Separate the inlay pieces and bring them to different heights from which the upper stop (18) for holding the central insert (14) at its Eject from the core (42) set up and the lower stop (19) to hold of the core (42) and the (2) disc (12) as they are ejected from the box suitable eats, with the altitude at which the stop (17) ge (18 and 19) are at the maximum stroke of the rod, Devices attached are, which when the rod (17) decreases, the decrease of the central insert (14) and the core (42) from their attacks as well as the subsequent transfer and Lower the central insert (14) into the core box (2). 2. Plant according to claim 1, d a d u r c h g e -k e n n z e i c h n e t that the shaft (15) of the central insert has a recess (20), which is congruent to the shape of the upper stop (18) of the rod (17). 3. Plant according to claim 2, d a d u r c h g e -k e n n z e i c h n e t that the upper stop (18) of the C # 7) rod as a cone and the lower stop (19) is designed as a shoulder, in which the diameter is the macimal diameter the upper stop (18) and the hole (13) of the disc (2) exceeds. 4. Plant according to claims 1, 2 and 3, d a d u r c h g e k e n n z e i c h n e t that the central insert (14) is lowered into the core box (2) Device (22) consists of a vertically arranged rod (35), which with a stop (36) is provided, which is the upper stop (18) of the rod (17) the device (16) for ejecting (2) the core. is similar to the box. 5. Plant according to claims 1, 2, 3 and 4, d a d u r c h g e k e n It is noted that the device (21) for (4Lf) removal and transfer of the central insert from two in two-armed levers pivotable on the horizontal plane (24), in which the one ends are above the device (16) for ejecting the Cores and the others above the central insert (iq) (2) insert in the core box lowering device (22) and two pairs of # guides (25 and 26), which are arranged between the levers (24) one above the other (26) and in which in the lower guides a slider (28) with one dimension the opening (30) which crosses the central insert (14) piece is accommodated, while the upper pair of guides (25) are arranged to rest on them Central insert pieces (14) arriving through the opening (30) of the sliding piece (28) can move, the slider (28) provided with two stops (31 and 32) is mounted on both sides of the opening (30) along the upper guides (25) are, of which the immovable stop (31) for moving the central insert C2S) (# 4) is used over the upper guides and the other stop (32) has a bevel (34) has, rotatable in a vertical plane and for moving another on the upper guides (zs) (49) gene located egg insert is determined, with the Ends of the two-armed lever (24) strips (27) are attached, which are to be held the central inserts (14) before their (25) displacement over the upper guides as well as serve after this shift. 6. Plant according to claims 1, 2, 3, 4 and 5, d a -d u r c h g e k Note that the device (23) for acceptance and Conveyance of the core (42) a sword ble lever (38) attached to its end Gripper (39) (38) and a fixed platform arranged below this plane (40) with a plunger (41) moving back and forth over the same, which cooperates with the core (42) when it is removed from the system. 7. Plant according to claim 6, dadurchge -kennzeichn et that the gripper (39) of the pivotable lever (38) as a flat spring trained jst.