DE1558188B1 - Control device for pulling a pipe blank out of the mold of a centrifugal casting machine - Google Patents

Description

1 2

The invention relates to a control device for scanning the tip end inside the mold, the pulling out of a smooth spigot end and one and that these two act on the radiation of the socket end having tube blank from the melted and solidifying iron anspre-mold a centrifugal casting machine, the mold-chilling cells of which are spaced apart, Carrier carriage and pull-out device in the longitudinal direction, which is slightly larger than the total length of the mold device are movable, with a double-acting and with the switches, the electric valve for the Pressure cylinder, solenoid valve for the inflow and inflow and the control relay are connected. By automatic control relay for the pull-out process. this arrangement becomes after an unsuccessful pull-out-id centrifugal casting machines are already known, the pull-out device is immediately restarted in the process in which the so-called pull-out device inserted the pipe to be pulled out. Demolding device from a one automatic An advantageous embodiment of the invention

acting pliers-carrying carriage. Approaching the control device according to this is characterized this carriage to the end of the mold, so vernet that that at the tip end of the mold on the As a result, the photoelectric, which is still arranged in the mold carrier carriage, is stretched into the sleeve the tube inserted in the mold can be folded up into 15 cells.

the sleeve and pulls by moving it backwards. The flip-up photoelectric is advantageous

Dare the pipe out of the mold. In the case of a cell, attached to the end of a lever, which is so automatic working embodiment of this directs is that with it the cell in the operating position The device can be lowered to take effect and folded up into the rest position triggered by a closing contact 20 the can.

at the end of the spinning phase by the Advantageously, the fold-up photo-

Machine is operated. If the pull-out pre-electric cell has a fold-out screen does not go through, d. That is, the pliers will be difficult to cover. The drawings show in or not anchored in the pipe at all, the output must be F i g. 1 the side view of a with the invention

Pulling device for initiating a new extraction test equipped according to the control device moved backwards. This requires casting machine,

attentive monitoring and constant monitoring

Entity of an operator. The partial view also shows that at the tip end of the mold on the mold Activation of human activity in the car carrier trolleys arranged fold-up photo-electromatic Work cycle of the machine of the product- 30 electrical cell in operating position, slowed down. FIG. 3 shows a representation corresponding to FIG. 2

There is also already a centrifugal casting machine for casting the photoelectric cell in the folded-up position treatment of pipes of the type mentioned above,

(USA.-Patent 2 943 369), which a Fig. 4 is a circuit diagram of the invention

Has control device, which consists of a control device on the 35,

Radiation of the molten and in the mold Fig. 5 a control device according to the invention

solidifying iron appealing device containing centrifugal casting machine at the beginning photoelectric cell and on the machine frame of the extraction process in FIG. 1 corresponding men arranged, from the machine carriage loading representation and actuated switches consists. This known control 40 FIG. 6 shows the centrifugal casting machine according to FIG. 5 however, regulates the actual casting process. during the pull-out process.

The object of the invention is therefore the creation of a control device of the type mentioned, which exemplary embodiment, the invention is applied to a machine for fully automatic execution of the casting process for centrifugal casting of pipes of the "Lavaud" type without supervision by operating personnel . This machine has a tilt in such a way that in the event of a faulty bare ladle A , from which the molten course of the extraction process, the automatic zene metal is immediately interrupted via a pouring channel B into the mold or work cycle and required form 1 is poured. This form rests on an automatic return of the carts C, which is effected between points and b on the pull-out device in the position inclined slightly downwards from α to b, which is followed by anchoring the tongs in the runway again. In the axial exten-pipe sleeve to repeat the Entformungsvor- of the mold and this runway tion from an output is effected. In this case, if the pull-out carriage fails, only a slight loss of time is to occur for the one to detect the pull-out attempt. shaped pipe T inside its socket

This object is achieved by a tax regulations 55 agreed automatically operating pliers P wears. This direction of the type mentioned at the outset, which according to the pull-out device E is also characterized in that two of them see their upper and lower end point c with respect to the upper point of the carriage of the pull-out device d, inclined runway move. Switches arranged for this direction, and close to this purpose, is the pull-out carriage E at an overhead point, a roller 4 photoelectric cell carried on the mold carrier carriage at 60, and a roller 4 mounted on the end of the piston-sleeve end of the mold, fixedly arranged at the end of the first rod of a pressure cylinder V has which radially straightening cable 2 is struck, whereby a flashlight is formed to train the exit at the socket end of the mold. The ends of this pulley block of the pipe from the beginning of its extension are attached to fixed points 5 and 6. This touch, as well as a second during the casting process 65 block and tackle of a type known as such, which can be switched off photoelectric cell, which in the light the use of a pressure cylinder V, des-mold carrier carriage at the tip end of the mold against sen stroke is only half as large as that of the extension before the longitudinal axis the mold is inclined, direction E.

3 4

Solenoid valves controlling the pull-out device E are actuated above the runway cd

device E are retractable and retractable support bodies 7 for, namely:
the demolded tube T is arranged. This support body

at the desired time automatically fold a circuit 17 for controlling the opening, in order to enable the pulling device E to move through the pulling device E from device E upwards. the point d after the point c of their career

The following is now the object and its automatic return to the

of the invention forming electrical control device carriage c out in the event of a faulty course

described, which makes it possible to immediately one during the pull-out process, that is, when the

The error occurred during the extraction process of the pipe remained completely in the mold without

determine and turn off. by the pliers P of the extractor

The carriage C also has to be taken at the socket end of the mold 1

rigidly attached a photoelectric cell 8, the so a circuit 17 a for controlling the

is directed that they the escape of the sleeve of the withdrawal process, d. H. the downward movement

formed tube T scans (Figs. 1, 5 and 6). 15 of the extractor from point c to

At the other end of the mold 1 is on the point d, and

Car a second foldable photocell 9 attached to a holding circuit 18 for the automatic arranges which, in its operating position, is the sequence of the extraction process, the lower of which is that they open the inside of the mold at its point refraction, the immediate shutdown of the auto end scans. 20 matic course of this process, in particular

Both photocells 8 and 9 respond to the radiation caused when the formed tube T development of the molten and solidifying inside the mold is broken and only the iron is present. The foldable cell 9 is a piece of the same is pulled out, while the end of one outside of the mold carrier carriage C rend the other inside the mold remains an axis 11 pivotally arranged lever 25 is ben.
10 mounted, the pivoting of which is provided by a single-acting, with a return spring 13. B. about one of a, it should be noted that the cells 8 rack 13 a and a pinion 13 b and 9 amplifier relays are assigned 8 ° and 9 °, the mechanism takes place. The lever 10 is controlled by 30 off switches A ₈ , AS ₈ and B ₉ , BS ₉ . The impact of the pressure cylinder 12 with the pressure closing _{contact 15, switches C 15} and O _{15 are} pivoted to the medium in the working position and through.

the spring 13 is returned to its original position. In the circuit 17, the electric

pivots as soon as the pressure cylinder 12 is no longer valve EV for controlling the reciprocating movement

is applied. 35 supply of the extractor E and the on / off switch F

As will be explained further below, it is necessary to use a limit switch Cc for the movement of the pull-out device to fold up the photoelectric cell 9 during the device at the upper end c of its path during the pouring phase. It is only switched on during the. The on / off switches A ₈ and B _{9 of} the photoelectric cells 8 and 9 controlled by the pulling out of the tube into their operating position are folded down. 40 strength relay 8 ^a and 9 ° and the circuit _{breaker C 15 is}

The pressure cylinder 12 is actuated by an electrovalve on the mechanical contact 15. The switch-off actuated, which is opened by a mechanical located at the lower point b of the A ₈ (it is open in the rest position and the travel path of the carriage C is closed when the cell 8 is excited). The AusKontakt 14 is controlled by the car C switch B ₉ is closed (it is closed in the rest position as soon as this opens at the lower end d 45 and closed when the cell 9 is energized), his car has arrived and thereby The switch C ₁₅ and the contact 26 of the closing flap of the photoelectric cell 9 in their contact Cc are open (they only open when the operating position is effected. They are actuated and remain idle.

By means of one of the pull-out locks on the track cd).

direction at a short distance from that of the mold 50 The electrovalve EV is also in the stream adjacent end point c of its path arranged circle 17 ^a in series with the switch G of the double mechanical contact 15, the pulse for the pelschlusskontaktes Cc is switched. Because the automatic return of the extractor E, ser closing contact Cc at P opens the circuit 17 if it has not detected the pipe, or for it closes the circuit 17 ° at the same time at G and the immediate shutdown of the same in the case of a 55 vice versa. It is given by a return spring 28 in the rupture of the pipe. This contact 15 is returned to the closing position of the circuit 17 during the passage of the extractor and while it is consumed. The double closing contact Cc thus fulfills the entire period of time during which the task of a real reversing switch for the pulling device is between the point of this con-electrovalve EV. When it closes the circuit clock 15 and the upper point c of its path, it controls this electric valve in the sense of the Aufdet, actuated by an upward movement of the extractor on the extractor E towards the arranged ramp D. During the rest of the time point c. When he closes the circuit 17 ^a , controls the contact is released. he on the other hand the solenoid valve in the sense of the downward

The electrical control device consists, like the movement of the extractor after point d.

Schematic circuit diagram according to Fig. 4 shows, in the prior art, not

essentially from three circuits, the construction shown in para-

allele are connected in a two-wire network 16, a temporary pulse or a short-term storage

through which the pressure cylinder V of the extraction of the circuit 17 or of the circuit 17 ^a

5 6

is sufficient to switch the upward movement or downward movement and its removal, the support body 7 movement of the pull-out device. switched off, a new core is set in the socket 1 on-In the holding circuit 18 for the automatic and the working cycle begins again. A relay RA is connected to the operating cycle, which in this mode of operation, the electrical control device operates the automatic course of the pull-out cycle as follows:
gives. This relay controls one not shown
electrical circuit of a known type, the effect of which the automatic operation of the _Λ ._, _TJ . , ",. . ,
Machine depends. Subsequent to the relay RA ^L normal course of the pull-out process

is the circuit 18 in two parallel io (Fig. 5 and 6)
Branches divided.

In one 19 of these branches there is an im- At the end of casting, the end of the automatic sequence of the mold carrier carriage cycle C, which has arrived at the lowest point of its way, is arranged on the puIs push-button switch 20, which actuates the automatic operation of the pull-out device - 15 rather the application of the pressure cylinder 12 turns on again. Controls in the other circuit. Through this, the photoelectric 21 is an Auschalterifa, via which the supply cell 9 takes place in its on the inside of the mold at the end of the relay RA with electricity. The push button of the smooth tube tip directed effective position switch 20 and the off switch Ha are brought together. It is immediately excited because it is electrically connected in a known manner (such as the smooth end of the pipe T, which was cast, is sent to the circuit diagram by a simple dash-dotted infrared radiation. This is indicated by the line), so that through a switch B _{a of} the relay 9 ^f1 controlled on the cell 9 closes pushbutton 20, the pressure exerted, the off switch Ha is then in the control circuit 17 for the unlocking and the relay RA is energized, if the puller travels downwards while the ses is open. During normal operation, the 25 switch .BS ₉ in the junction 24 of the circuit breaker Ha is closed. 18 opens.

Then branched off to the Ha 'The cell 8 is not energized and the Untersich the branch line 21 in three mutually parallel crusher A ₈ and AS _S therefore remain closed. The conductors 23, 24, 25, which are connected to the second conductor wire breakers C ₁₅ and F of the make contact Cc of the supply circuit 16. In each 30 are closed in the circuit 17 and these lines are circuit breakers, namely the breaker D ₁₅ is opened. As a result, the circuit breaker AS ₅ , the circuit breaker BS ₆ , which are actuated by the control circuit 17 for the upward movement of the cells 8 and 9, as well as that caused by the pull-out device by the closing of the subcontact 15 when the circuit breaker C _{15 is} closed, are breakers F. the closing contacts Cc, A _s , B _a , C ₁₅ and in the same way operated switch D ₁₅ . 35 also the holding circuit 18-21-23 for the automatic flow of current in one of the three parallel sequence of the pull-out cycle is closed, since the interconnected conductors 23, 24, 25, the breaker AS ₈ and Ha are closed.
Circuit 18 supplied with power. If no current flows through the closing of the circuits 17 and in one of these conductors, the switch 18-21-23 opens, the switch Ha automatically moves upwards and causes the relay 40 to stop the puller E to the carriage C. RA, from which the automatic mode of action works. The extractor moves to the depending. The circuit 18 is then interrupted. towards the upper point of their way and

The operation of the device described is actuated in the course of its process, the push button

as follows: 15 (opening the circuit breaker C ₁₅ and closing the

It is assumed that in the usual 45 breaker D ₁₅ ). Despite the opening of the sub-way of the car C carrying the mold 1 after the crusher D ₁₅ , the extractor continues but its top dead center α of its way has been moved, movement to the point c, because the Elekum the melt, beginning at the socket end , ie troventil PV an impulse in this upward movement through the lower end of the mold 1, has been given in this sense to be effected. When pouring them on. Thereupon, the carriage C moves downwards at the upper point c, actuates the pull-out lower dead center b , thereby opening a device to the contact Cc, thereby opening the good distribution of the melt in the entire co-breaker F of the switching contact Cc of the Stromkille 1 to effect. The casting process takes place circle 17 and the closing of the breaker G so during the path of the car C of which the circuit 17 ° is effected.
Point α to point b. Subsequent to the 55. As a result, the circuit 17 (by opening the casting process after the carriage to the un- at F) is interrupted, the circuit 17 ^a for the lower point b of its way has come back and control of the downward movement of the extension device after a very short standstill period whose device (by closing at C) is closed and the purpose is to complete the centrifugal process - holding circuit 18-21-23 for the automatic sealing and cooling and solidification of the melt 60 during the extraction process remains closed (as the the pull-out phase begin. The pull-out breakers Ha and AS _{8 are} closed,
pulling device E is moved up to the upper point c The automatic downward movement of the Ausziehihres way and thereby inserted your pliers P in device E after the lowest point d of the socket of the formed pipe. The path is then automatically controlled. In spite of this, the puller E moves backwards and 65 backward movement of the contact switch Cc in the pulls the molded tube T out of the mold; In the closed position of the circuit 17, the latter then rests on the fold-out carrying movement of the pull-out device under the body 7. After pulling out the tube 7 effect of the impulse given to you when it arrives

7 8

at point c , and is only the automatic upward movement of the

ended upon arrival at point d . Extractor E is switched on immediately.

When the extractor pulls the pipe T into place, the pliers P again grips the socket of the formed

painterly pulls it out of the mold (Fig. 5 and pipe in. If the second attempt at pulling out succeeds,

6), the cell 8 is removed by extending the demoulding 5 everything is as in the first case. Otherwise it will

th tube T energized, but the cell 9 no longer automatically carried out a third pull-out attempt,

excited. Therefore the off switches A _a , B _Q and AS _{a are} " _". _,, _,. _T

open, on the other hand the switch CS _{9 is} closed! . * - * f ^em 5 ^{s ru} B ^{(: hes of the} tube inside

As a result, the circuit 17 (by opening ^{the cylinder and} partially pulling out the fragment

nen the switch ^ t ₈ and B ₉ ) opened and the io It is again assumed that the

Holding circuit 18-21-24 for the automatic extractor at the beginning of its downward movement

Cycle (by the closing of the circuit breaker Ha supply from c to d, that is, at the point c, is,

and BS ₉ ) closed. In this case both the photoelectric

The extractor moves as a result of the cell 8 as well as the cell 9, which is automatically energized by the fragment of the smooth tip control impulse remaining in the mold provided to the electrovalve EV through the contact Cc and releases when it over- ends. Open under these conditions, the contact 15 expires. At the same time the breakers A ₆ , AS ₈ and BS ₉ close, while the breaker C ₁₅ closes and the breaker B ₉ closes. As soon as the extractor D opens. The circuit 18-21-25 remains a device that has passed contact 15 and releases it, closed, and current therefore flows in it. The circuit breakers C ₁₅ and D ₁₅ open on the 20. To this circuit 17 remains interrupted. As soon as the off time, all three current branches 23-25 pulling device are interrupted at the lower point d of their path. The circuit 18, 21 has arrived interrupted, the tube T is completely pulled out and consequently the interrupter Ha has also been opened. so that the relay RA of the circuit 18, 21 no

Since cells 8 and 9 are no longer energized, 25 receives more power. This means that the automatic

the switches A ₈ , AS ₈ , BS ₉ close, while the table sequence of the work cycle is switched off. At the

Switch B ₉ remains open. End of the downward movement of the extractor

Therefore, the control circuit 17 remains for the tungi? at the lower point everything comes to a standstill

Control of the upward movement of the extension board. Then what remains in the mold must

direction (by opening switch B ₉ ) and also 30 fragments of the pipe can be pulled out by hand

the control circuit Γ7 ^α for controlling the elevators. For example, this is done by sending to the

upward movement is interrupted, on the other hand the pull-out device E is an extension piece.

Circuits 18-21-23 (by closing the switch is set, which enables the in the mold

AS ₈ ) and 18-21-24 (by closing the switch to grasp the remaining fragments, whereupon by means of

BS ₉ ) closed. 35 snap fasteners (not shown in the figure)

The pull-out device E can now move upwards and then move downwards while waiting

ment remain until the fact that the puller is controlled at the end of the. after the

Pouring a pipe excites the cell 9 and fragments of the broken pipe have been removed here

when the corresponding impulse is given, cells 8 and 9 are no longer excited.

Outward movement begins again. 40 The breakers A ₈ , AS ₈ and BS ₉ close by

new. The circuit 17 is opened by opening the

2. In the event of a faulty course, breaker B ₉ interrupted. The circuit 17 ^a

rfp <! Anwphvnraanop * ^is by opening the breaker G of the switch

of the pull-out process _{Cc geöffQet} ^ _{circuits m 2} 1, 23 and 18, 21,

It is again assumed that the Aus 45 24 remain as a result of the opening of the breaker Ha

pulling device opens further at the upper point c of yours.

Path is located and under the action of To close the breaker Ha, accordingly

the control pulse given to the switch Cc (whereby the circuit 18 and thus to restore

the circuit 17 is interrupted and the circuits of the automatic working cycle must be the pressure

17 a and 18, 21 are closed) begins, button 20 is pressed. This gives the relay

move forward. RA electricity and the automatic duty cycle can

In the event of an incorrect pull-out process, start over.

Process, d. that is, if the extractor is after the pipe has been extracted and the usual

Moved from c to d without pulling out the tube T , working measures of blowing in ferrosilicon

because your pliers are not in the socket of the pipe 55 and inserting a new socket core will be the

has hooked up, cell 8 is not energized. The carriages C of the centrifugal mold up to the

Cell 9, however, remains excited. The interrupters A ₈ , B ₉ move the pouring channel and thereby give the

and AS ₈ are closed, whereas the breaker switch 14 is free, which means that the

BS ₉ open. When contact 15 is exceeded. Pressure cylinder 12 terminated and the cell 9 up-

the pull-out device E is folded by closing the switch 60,

ters C ₁₅ and open the breaker D ₁₅ freely. The combination of cells 8 and 9 allows

Accordingly, the control circuit 17 closes the automatic monitoring of the extraction process

for the upward movement of the extractor and the immediate detection of any occurring

(by closing the breaker F, the fault switch while it is running without loss of time

Cc and the breaker A ₈ , B ₉ and C ₁₅ ), and the 65 and without having to wait until the pull-out

Holding circuit 18, 21, 23 for the automatic direction in a useless way after the end

The working cycle is completed by closing the path, ie moving down to point d

Breakers Ha and AS ₈ closed. has, but rather as soon as the pull-out

direction has reached the switch IS near the upper point c of its path in the course of its backward movement.

The combined cells 8, 9 also allow also the correction of an error berm extraction process without loss of time, ie, an automatic return of the puller to the upper point c of their path as soon as the extractor E on the effect on in the vicinity of the top point C lying abutting switch 15 reached. Since the photoelectric cell 9 is folded up during the pouring phase, it is not possible to switch on an untimely automatic backward movement of the extraction device, as would be conceivable on the other hand if the photoelectric cell 9 is at the time of pouring the melt into the pouring channel B would be in the operating position. Of course, the invention is not limited to the embodiment described in detail above and shown in the figures, which is only an example.

For example, it would be possible to use cell 9 instead to be folded up and fixed on the carriage C and to provide a fold-out umbrella in front of it.

Such a screen could be operated by a pressure cylinder in the same way as that Lever 10 is pivoted and then cover the cell 9 during the casting phase and during the Clear the pull-out phase. :. ;

Furthermore, the cell 8 could instead be above the exit axis of the demolded tube. also on the side of the Machine attached, with .then its line of sight would be directed horizontally.

Finally, it is also possible, in addition to its task explained above, to control the change in the speed of the pull-out device E in a manner known per se by means of the push-button switch 15. This then goes from a very low speed with which it is on the upper part of its path, between the point of the impact switch 15 and point c, in a high speed in the area of its path between the switch 15 and the lowest point b of this path over and vice versa.

Claims (4)

Patent claims: 1. Control device for pulling a smooth spigot end and a socket end having a pipe blank from the mold of a centrifugal casting machine, the mold carrier carriage and extraction device are movable in the longitudinal direction, with a double-acting pressure cylinder, electric valve for the inflow and automatic control relay for the extraction process, characterized in, that it has two switches (Ce and 15) arranged at the upper point of the path of the pull-out device, and near this upper point a first photoelectric cell (8) which is fixedly arranged on the mold carrier carriage (C) at the socket end of the mold (1) and which radially is directed to scan the exit of the pipe from the beginning of its extraction at the socket end of the mold, as well as a second photoelectric cell (9) which can be switched off during the casting process and which is mounted on the mold carrier carriage (C) at the tip end of the mold (1) against the longitudinal axis of the Mold (1) is inclined to the tip nde to be scanned inside the mold (1), and that these two cells (8, 9) responding to the radiation of the molten and solidifying iron have a distance from one another which is slightly greater than the total length of the mold (1) and connected to the switches, the solenoid valve (EV) for the inflow and the control relay. 2. Control device according to claim 1, characterized in that the at the tip end of the mold (1) the photoelectric cell (9) arranged on the mold carrier carriage can be folded up. 3. Control device according to claim 2, characterized in that the foldable photoelectric Cell (9) is attached to the end of a lever (10) which is articulated so that the Cell (9) can be lowered into the operating position and folded up into the rest position. 4. Control device according to claim 1, characterized in that the foldable photoelectric cell (9) can be covered by a fold-out screen. 1 sheet of drawings