US2457459A

US2457459A - Press for the covering of electrode rods

Info

Publication number: US2457459A
Application number: US609201A
Authority: US
Inventors: Gloor Karl
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-05-31
Filing date: 1945-06-18
Publication date: 1948-12-28
Anticipated expiration: 1965-12-28

Description

Dec. 28,- 1948.. K. GLOOR 2,457,459

PRESS FOR THE COVERING OF ELECTRODE RODS Filed June 18, 1945 2 Sheets-Sheet 1 INVENTOZ .KAQL GL 00!? ATTOQ/VEYS 28, 1948. K. GLOOR 2,457,459 I PRESS FOR .THE COVERING 0F ELECTRODE RODS Filed Julia 1a, 1945 j 2 Sheets-Sheet 2 m VENTOE KARL GLOOE Patented Dec. 28, 1948 PRESS FOR' THE COg'gRNG F ELECTRODE- Karl Gloor, Zurich, Switzerland Applic'atio'nJune 18-, 1945, Serial No. 600,201 In Switzerland .May 31,1944

Section 1, Public Law 690; August 8, 1946 Patent expires May 31, 1964 9 Claims.

1 This invention relates to a press for covering or coating electrode rods. Several types of presses are known for coating electrodes by means of a welding mass. Up to the present a continuous process has been carried out upon presses in which the covering substance is forced, together with the electrode rod, through a nozzle by means of a screw conveyor. With this type of machine only certain compositions of the covering masses can be treated, as with a screw conveyor only a restricted expulsive pressure can be obtained. For treating covering masses which require ahigh expulsdve pressure, hydraulic or mechanically operated piston presses are employed. Such presses, however, have the drawback that by the withdrawal of the pressing piston and the introduction of the mass in the pressing cylinder, a disproportionately large amount of time is lost. These stoppages increase the manufacturing cost of electrode rods not only by reason of the reduced output but also owing to the fact that smooth operation cannot be obtained during the completion and packing of the electrode rods.

An object of this invention is to eliminate the disadvantages of such piston presses. The invention consists of a fixed cylinder head and a specially adjustable cylinder containing the pressing nozzle in which a blocking organ with shuttable passages is arranged which functions as a piston when the holes are closed, and also a filling piston which fits into the cylinder..

The appended drawings illustrate as an ex ample one design of the invention:

Fig. l is a longitudinal section of the press with an adjoining hydraulic distributor, schematically presented, inthefirst stage of the process,

Fig. 2 is a section along the line 11-11 in i 1,

Fig. 3 shows the cylinder with the filling piston before the second stage of the process, after the change-over when the pressing piston commences its movement to the left and the filling piston its movement to the right,

Fig. 4 is a section along the line IVIV in Fig. 3,

Fig. 5 is a variation of the pressing cylinder.

The cylinder head 2 is, by means of the thread 4, screwed into the frame I, which contains the 4 pressing nozzle 3. The electrode rod 5 is coveredwith the mass. The electrode rod 5 movesin the tube 6. The tube 1 rests freely on the tube 6. A cup-shaped case 8 rests freely on the cylinder head 2. The former contains at its front end three passages 9 and bridges Ill. The case 3 is prevented from turning by the key 12, the latter resting in the case f3 of the frame I. The key 121's guided in the slot I 2". A threaded ring IQ is interposed between portionsof the inwardly extending case l3 and of thecase [5; the latter is provided with a web 15' which-contains passage openings I9 and bridges which correspond to the openings s and bridges ill of the case '8, so that by turning the two cases 8 and 15 relative to each other the passage for the mass either opens or closes. The pressing piston i6 .is fixed to the c'ase lii. The interior of the case 8 forms the pressing cylinder in which the mass is pressed. The left end of the case 15 contains 'a key whichcan be moved in the key groove 28 of the case 21. The case 2'! contains a cogsegi'nent-R' (Fig. 2) which meshes with the rack 28" and is rotatably mounted in the track's-of the frame I. The case 15 rests in the cylinder 31, which is cast with the frame I,

so that'by turning the case z'l-o'n the cog seg-" ment 28 .the'c'ase l5 and at the same time the bridges 20 are termed, whereby the passage for the mass either opens or closes. The tube 1 is firmly screwed into the case 15 by means of the stop and the thread 32', so that the tube 1 moves along with the case 15. The filling pasten 33,. which fits into the case 15, rests freely on the tube 1. The'fill ing piston 33' is fitted with .a piston head 34, which is moved backwards and forwardsin the filling piston cylinder 35 by apressing fluid. In the pressing piston there is a ring groove 36 into which fits the head 31 of the return bar 38' moving in the framewall 39, and which indirectly controls the supplyoi the pressing liquid in front of or behind the piston 16. A cylindrical mass of electrode rod coving material, consisting of two halves, which has previously been pressed and which serves to cover the electrodes, is introduced in thespace of the case 15 and pushed by means of the rfil'ling' piston 33 into the space in front of the passage opening 19. By means of the-pressing piston l6, behind which "the pressingiliquid later described is directed,v the case 15 which is rigidly connected to the pressing piston is pushed to the right, whilst the filling piston 33' is held fast inits extreme left position by the pressing. liquid :behind the piston head 34'. The mass in the space 40 is pressed by this movement through the openings [9 and 9 intothe inner chamber 4| (Fig 3) which is formed in the case-'8. This innerchamber 41 has however only'halfthevolume of the'spac'e 40,.sothat hall of the mass of the space 40 is displaced through the nozzle opening 3. After the pressing piston l6 has completed its path to the right case 8 and case l5 are in a first operating position as shown in Figure 3 and the following process takes place:

The filling piston 33 is i of the pressing liquid into its extreme right posi- I I tion. At the same time the case 21 and, through this, the case |5 are turned.by means of the pis-I ton 43 Fig. 1 along the cog-segment 28, whereby brought by the reversal the openings I9 and 9 are closed by the bridges,

20 and I0. At the same time the reversal of the the valve seats being formed by the walls of these conduits. The female thread 61 is placed on the thread 59 of the extension of the control piston 53 and is rigidly connected to the return bar.

In order to prevent the oscillation of the pressing piston l6 and to obtain an immediate reaction of the latter it is advisable that the force of the pressing liquid, even in front of the pressing piston be, in the direction of the latter. The difference in pressureof the-liquid behind and in front of the pressing piston l6 corresponds to the pressing force which is necessary for the expulsion of the mass through the nozzle 3. If, for

pressing piston l6 takes place, so that. this lat-.1.

ter moves with the cases l5 and 8 to the left. By

this movement the second half of the mass from the space 4|! which is left in the space 4| islike a wise pressed through the nozzle 3. When case 8 f instance. a pressure of 20 atmospheres is necessary on the pressing piston H3 in order to expel I the mass,,the counterpressure will be 20 atmospheres with a pump pressure of i atmospheres on the rear side of the pressing piston I6. In

and case have moved to an extreme left posi- V tion they are in a second operating position as shown in Figure 1. During the movement of the pressing piston IE to the left a new filling of the mass is enclosed in the space 40 by means of the filling piston 33, so that after several reversals of the piston l6 to the right the described process is repeated.

In Fig. 5 the part of the pressing cylinder which in Fig. 1 is formed by the parts 8 and 5, is replaced by the cylinder 8|]. A disc 83, provided: with holes 82, serves as blocking organ of the pas- I sage openings 8|, and is firmly connected to the The tube 84 which rotary tube 84 (l in Fig. 1). is directed through the filling piston 33 and the filling piston cylinder 35 (Fig. 1) to a space behind the latter, is turned by any suitable means which are not specified, whereby the passage openings 8| of the cylinder 80 are opened or closed, as the case may be, by the bridges of the disc 83.

As the propulsive speed of the electrode rods remains constant, the speed of the expulsion of i the mass from the nozzle 3 must be constant and correspond exactly to the propulsive speed of the.

of pressing liquid to the pressing piston I6 is directed by means of the mechanical and hydraulic distributor as described below.

A conduit 5| leads from the pump to the. control cylinder 52 which latter is formed by a hollow bored in a part of the frame I. From this cylinder 52 two

conduits

54 and 55 lead into the cylinder space of the pressing piston. l6. In the control cylinder is the control piston 53, which is turned by the motor 56 by means of the pu1-

leys

51 and 58. The distribution of the pressing liquid is effected however not by the turning of the control piston 53 but byits moving on its axis. protrudes over the cylinder 52 is fitted with a thread 59. The end 60 of this thread worm is placed in the frame I. The

conduits

54 and 55 leading into the cylinder space of the pressing piston l6 are more or less opened and closed by a valve having valve bodies formed by the two; control edges 6| and 62. The control edges or

valve bodies

63 and 64 cause the reversal of the pressing liquid throughthe conduits 65 and '66,

The part of the control piston 53 which" order to ensure this regulation of the counterpressure, the control piston 53 is connected by means ;of the female thread 6'! and the return bar 38 to the pressing piston I6. In the position, shown in Fig. 1, the piston I6 is located in its middle position, and the conduits 65 and 66 are both closed. If the pressing piston I6 is stationary, the thread 59 screws-with the control piston 53 by the turning of the latter into the female thread,,whereby the control piston 53 is shifted along'its axis to the left. In this way the reflux of the pressing liquid is permitted, bythe control edge- .64 opening conduit 66, so that the pressure is reduced on that side of the pressing piston fedbyconduit 55 before reaching the pressing piston l6, while at the'same time the pressure behind the pressing piston l6 is increased by the control edge 6| further opening conduit 54 and closing conduit65.

-By'reason of the excessive pressure which is now developed behind the pressing piston |6 the latter isshifted to the right, whereby the control piston53 is lead back by means of the return bar 38 and the female thread 61 to the right, so

that the control 'edge 64 again closes the reflux through the conduit 55.

The process would be repeated along thewhole path of the pressing piston l6. Owing to the inertia of the apparatus, however a similar movement is produced in the pressing piston. The rotary-speed of the control piston 53 therefore determines the propulsive speed of the pressing piston- 16, which is dependent upon the'nature and sizeof the electrodes. For the manufacture of various types and sizes of electrode rods it must be possible to regulate the number of revolutions of the control piston 53, and this is suggested by the graduated discs or step cone pulleys 51 and 58. As the pressing'piston l6 operatesin both directions, the rotatory direction of the control piston mustbe reversible.

The following device, which is schematically presented, serves to'control the piston 43, which effects the opening and closing of the passage openings in'the cylinder and of the filling piston 34," and also serves to switch over the motor 56.

A conduit (8 leads from the pump 5|l-to the controlcylinder 1|, inwhich the control piston 72 rests in a position where it is free to move alongits' own axis. The piston 12 is moved by means of the bar '13, which is fixed to the female.

thread 61. The bar '73 knocks against the stops Hand 15, which. are'fixed to the ends of'the piston 12. Two conduits l6 and TI lead from thecylinder H, to the cylinder E8, in which thepiston-:43'moves, and to the filling piston cylinder 35. The 'conduits serve alternatelyas pressaugust ing and return conduits, in connection with the The filling movement and the expulsion of the.

mass, likewise the opening and closing of the passage openings, could be worked mechanically instead of by hydraulic power without sacrificing the principle of the invention.

I claim:

1. A press for coating electrode rods, comprising a fixed cylinder head containing a pressing nozzle, a cup-shaped case having an inner chamber directed toward said nozzle for transmitting a coating mass to said nozzle, and further having openings formed in the front end thereof, another case having a web located adj acent the firstmentioned case and having openings formed therein and adapted to aline with the openings of the first-mentioned case, means connected with the second-mentioned case for rotating it relatively to the first-mentioned case to bring the openings of the two cases in and out of alinement, means engaging said cases to cause them to move jointly longitudinally and a filling piston movable within the second-mentioned case, whereby relative longitudinal movement between said filling piston and the second-mentioned case will press the coating mass into said inner chamber when the openings are in alinement.

2. A press in accordance with claim 1, wherein the space for the coating mass within the secondmentioned case is approximately twice as large as the space for the coating mass in said inner chamber adjacent said nozzle.

3. A press for coating electrode rods, comprising a fixed cylinder head containing a pressing nozzle, a cup-shaped case having an inner chamber directed toward said nozzle for transmitting a coating mass to said nozzle, and further having openings formed in the front end thereof, another case having a web located adjacent the firstmentioned case and having openings formed therein and adapted to aline with the openings of the first-mentioned case, means connected with the second-mentioned case for rotating it relatively to the first-mentioned case to bring the openings of the two cases in and out of alinement, a member connected with the second-mentioned case and contacting the first-mentioned case to enable the two cases to reciprocate jointly in a longitudinal direction, a pressing piston firmly connected with the second-mentioned case, means actuating said pressing piston and a filling piston movable within the second-mentioned case, whereby relative longitudinal movement between said filling piston and the second-mentioned case will press the coating mass into said inner chamber when the openings are in alinement.

4. A press for coating electrode rods, comprising a fixed cylinder head containing a pressing nozzle, a cup-shaped case having an inner chamber directed toward said nozzle for transmitting a coating mass to said nozzle, and further having openings formed in the front end thereof, another case having a web located adjacent the firstmentioned case and having openings formed therein and adapted to aline with the openings of the first-mentioned case, means connected with the second-mentioned case for rotating it relatively to the first-mentioned case to bring the openings of the two cases in and out of alinement, a filling piston movable within the secondmentioned case, means engaging said cases to cause them to move jointly longitudinally in the direction toward said filling piston, and: means maintaining said filling piston in its position within the second-mentioned case during said. v joint movement of the two cases, whereby said filling piston absorbs the counterpressure: of the coating mass which latter is pressed throughsaid openings and said inner chamber toward said nozzle.

5. A press for coating electrode rods, comprising in combination with a pressing nozzle through which an electrode rod is movable at a constant speed, a cup-shaped case having an inner chamber directed toward said nozzle for transmitting. a coating mass to said nozzle, and further having openings formed in the front end thereof, another case having a web located adjacent thefirstmentioned case and having openings formed therein and adapted to aline with the openings of the first-mentioned case, means connected with the second-mentioned case for rotating it relatively to the first-mentioned case to bring the openings of the two cases in and out of alinement, means interengaging said cases to permit, them to reciprocate jointly longitudinally, means. transmitting an operating fluid to one of said cases to cause the joint longitudinal reciprocating movement thereof, a filling piston movable within the second-mentioned case, whereby relative longitudinal movement between said filling piston and the second-mentioned case will press the coating mass into said inner chamber when the, openings are in alinement, and means connected with the last mentioned means for regulating. the; transmission of saidoperating fluid andc'omprisa ing a. valve regulating the amount and direction of flow of said operating fluid and including a plurality of valve seats, a corresponding number of'valve bodies cooperating with said valve seats, a single shaft carrying said valve bodies and having a threaded. portion, a member supporting said shaft and having threads meshing with the. threaded portion thereof, and means rotating said shaft,.whereby the transmission of the operating fluid and the speed of movement of said cases i may be correlated to the speed of the electrode rod through said pressing nozzle.

6. A press for coating electrode rods, comprising a fixed cylinder head containing a pressing nozzle, a cup-shaped case having an inner chamber directed toward said nozzle for transmitting a. coating mass to said nozzle, and further hav ing openings formed inthe front end thereof, another case having a web located adjacent the first-mentioned case and having openings formed therein and adapted to aline withthe openings of the first-mentioned case, means connected with the second-mentioned case for rotating it relatively to the first-mentioned case to bring the openings of the two cases in and out of alinement, means interengaging said cases to permit them to reciprocate jointly longitudinal-1y, a pressing piston firmly connected with the second-mentioned case, means transmitting an operating fluid to said pressing piston to cause thejoint longitudinal reciprocatory movement of the two cases, a filling piston movable within the second-mentioned case, whereby relative longitudinal movement between said filling piston and the second mentioned case will press the coating mass into said inner chamber when the openings are in alinement, and means connected with the last-mentioned means for regulating the transmission of said operating fluid and comprising a control cylinder having a plurality of valve seats, for regulating the amount and direction of flow of said operating fluid and a control piston reciprocable within said control cyl- 1 inder and having a corresponding number of valve bodies cooperating with said valve seats.

- '7. A press for coating electrode rods, comprising a fixed cylinder head containing a pressing nozzle, a cup-shaped case having an inner cham- 1 ber directed toward said nozzle for transmitting a coating mass to said nozzle, and further having openings formed in the front end thereof, another case having a web located adjacent the first-mentioned case and having openings formed 1 therein and adapted to aline with the openings Of' the fhst-mentionedcase, means connected with the second-mentioned case for rotating it relatively to the first-mentioned case to bring the openings of the two cases in and out of alinement, means interengaging said cases to permit them to reciprocate jointly longitudinally, a pressing piston firmly connected with the second-mentioned case, means transmitting an operating fluid to said pressing piston to cause the joint longitudinal reciprocatory movement of the two cases, a filling piston movable within the second-mentioned case, whereby relative longitudinal movement between said filling piston and the second mentioned case will press the coating mass into said inner chambers when the.

piston reciprocable within said control cylinder, and having a corresponding number of valve bodies cooperating with said valve seats, a threaded shaft firmly connected with said con-*. trol piston and movable therewith, a member. supporting said shaft and having threads meshing with the threads of the shaft, and means} rotating said control piston and shaft.

8. A press for coating electrode rods, comprising a fixed cylinder head containing a pressing nozzle, a cup-shaped case having an inner cham-.

ber directed toward said nozzle for transmitting a coating mass to said nozzle, and further having openings formed in the front .end thereof,

another case having a web located adjacent the first-mentioned case and having openings formed therein and adapted to aline with the openings of the first-mentioned case, means connected with the second-mentioned case for rotating it relatively to the first-mentioned case to bring the openings of the two cases in and out of aline ment, means interengaging said cases to permit them to reciprocate jointly longitudinally, a pressing piston firmly connected with the secondmentioned case, means transmitting an operating fluid to opposite sides of the pressing piston with different pressures, a filling piston movable within the second-mentioned case, whereby relative longitudinal movement between said filling piston and the second-mentioned case will press the coating mass into said inner chamber when the openings are in alinement, and means con nected with the last-mentioned means for regulating the transmission of said operating fluid coating and comprising a control cylinder having a plurality of valve seats, for regulating'the amount and direction of fiow of said operating fluid, a control piston reciprocable within said control cylinder and having a corresponding number of valve bodies cooperating with said valve seats, a threaded shaft firmly connected with said control piston and movable therewith, a member supporting said shaft and having threads meshing with the threads of the shaft, means rotating said control piston and shaft, and means operatively connecting the shaft-supporting member with said pressing piston, whereby the rotation of said shaft and said control piston determines the path of movement of said pressing piston and the cases connected therewith.

9. A press for coating electrode rods, comprising a fixed cylinder head containing a pressing 1 nozzle, a cup-shaped case having an'inner chamber directed toward said nozzle for transmitting a coating mass to said nozzle, and further having openings formed in the front end'thereof, another case having a web located adjacent the first-mentioned case and having openings formed therein and adapted to aline with the openings of the first-mentioned case, means connected with the second-mentioned case for rotating it relatively to the first-mentioned case to bring the openings of the two cases in and out of alinement, means interengaging said cases to permit them, to reciprocate jointly longitudinally, a pressing piston firmly connected with the second-mentioned case, means transmitting an operating fluid to said pressing piston to cause the joint longitudinal reciprocating movement of the two cases, a filling piston movable within the second-mentioned case, whereby relative longitudinal movement between said filling piston and the second-mentioned case will press the mass into said inner chambers when the openings are in alinement, and means connected with the last-mentioned means for regulating the transmission of said operating fluid and comprising a control cylinder having a plurality of valve seats, for regulating the amount and direction of fiow of said operating fluid, a control piston reciprocable within said control cylinder and having a corresponding number of valve bodies cooperating with said .valve' seats, a threaded shaft firmly connected with" said control pistonv and movable therewith, a member supporting said shaft and having threads meshing with the threads of the shaft, means rotating said control piston and shaft, and means connected with the last-mentioned means for varying the number of revolutions of the control piston depending upon the type and size of the electrode rod to be produced.

KARL GLOOR.

nnrnnnNcas crrnn The following references are of record in the file of this patent: