DE1913659A1 - Grinding machine - Google Patents

Description

Dipl.-Ing. Dipl. Oec. publ.

DIETRICH LEWINSKY

• PATENT ADVOCATE. 18 ₀ j _e 1969

8 Munich 21 - Golthordstr. 81, _, _{ΛΛ tWtt}

Telephone 561762 '5bO1-I.l / He,

Pennsalt Chemicals Corporation) Three Penn Center Plaza,
Philadelphia 2, Pemis; y3yania, USA

"Grinder"

Priority dated 21 “Harz 1968 from the United States patent application
Kr. 714 945

The invention relates to a grinding device with a number; from nozzles supplied with gas-driven abrasive material, with
a pressure vessel that can be supplied with pressurized gas, with I

a reservoir for the abrasive material within the printing area ^:

hälters, with a likewise within the pressure vessel loading ι

Sensitive container for the abrasive material, which is from the Re- j

servoir can be filled, and with a pipe between j

the grinding material container and each nozzle in which the gas j

driven abrasive material transported v / earth can 'Such'

Grinders can be used for brushing, reworking, cleaning or; Used to deburr workpieces,

In known grinding devices (USA Patent No. ₀
2,696,049 and 3,344,524) the gas-powered abrasive material can be directed from a central source in uniform concentrations to i different nozzles over an extended period of time ^; "A disadvantage of these otherwise satisfactory grinding devices is that they require devices
which can store a large amount of abrasive material and
that this must then be distributed in the same proportion into gas streams which flow through a number of supply lines in order to achieve the same processing effect through f. He nozzles

909641/1055

ORIGINAL

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to achieve »This enables a special grinding process that takes place simultaneously with a number of adjacent processing points, for example a number of parallel j assembly lines, can be carried out with uniform results_

The invention is based on the object of providing a grinding device of the type mentioned at the outset while avoiding the known ^! Grinding devices adhering liachteile to create, which is particularly simple, requires only a small amount of abrasive storage and ensures an effective way of working.This task is achieved in the grinding device proposed here in that, according to the invention, the grinding material container can be displaced in its angular position around a vertical axis and has outlets (80) which are arranged around this axis in such a way that each outlet can supply an associated line with abrasive material »

Bine advantageous embodiment of the invention Grinding device is that drive means for vibrations of the abrasive material container are provided around the axis.

Another advantageous embodiment of the invention Grinding device consists in the fact that the abrasive container is a barrel with a vTand formed in a ring around the axis and that each outlet has a tubular part which extending generally tangent to the annular 7and ".

Another advantageous embodiment of the invention Grinding device is that the drive means a rotary oscillator, a grinding material container with the Torsional vibrator connecting drive member and this in a movement in an inclined arc around the vertical axis.

909841/1055

have rende FiUirungsglieder, and that the abrasive material container reciprocating drive pulses received by the Lift out the abrasive material and throw it out of the outlets in one direction of the arc movement, and into the starting position returns after the arc movement in the opposite direction "

Another advantageous embodiment of the invention Grinding device is that support parts are provided for the reservoir, which have a spring structure, the press the reservoir upward against the weight of the abrasive material stored therein, and that the upward movement of the Reservoirs when emptying the abrasive material in a predetermined Position for the notification of this condition causing organs are provided ",

Another advantageous embodiment "of the invention Grinding device is that the pressure vessel has a base and a side wall structure which are used to form a Access to the interior of the pressure vessel can be separated from each other are, and seals and a twist lock between base j and side wall and locked by the movement of the Y / andaufbaus: apply or unlocked positions relative to the base dependent switch to display the unlocked state of the land structure compared to the base.

A v / urther advantageous embodiment of the grinding apparatus of the invention is that in the pressure vessel supplied with gas line a normally open valve is provided by the switch to ^close: indicates the gas supply pipe, the wall structure does not yfenn to the base locks is "

Another advantageous embodiment of the invention! moderate grinder is that the corresponding input>

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BAE) OCTGLNAt

Let the lines underneath the outer ends of the tubular parts establish openings for receiving the abrasive material discharged therefrom for mixing with pressurized gas and conveying it to the corresponding nozzles _:

Another advantageous embodiment of the invention. moderate grinding device is that in each tubular part is loosely arranged through this extending wire, which it by movement therein as a function of
the angular movement of the pressure vessel of the downcast
Keeps grinding material free "

Another advantageous embodiment of the grinding device according to the invention is that the arc movement
the outer ends of the tubular parts in one direction
«Extends no further than the arcuate movement of a tubular member over an associated opening

Another advantageous embodiment of the invention
Moderate grinding device consists in that selectable heating elements to be operated are provided for heating the pressurized gas
sindo

Further features and advantages achieved by them are based on

the description of the drawing, in which an example!

wisely chosen embodiment of the inventive grinding;

device is illustrated schematically. Show it.

Figo 1 is a vertical sectional view of an embodiment:

of the grinding device according to the invention and i

Pig »Figure 2 is a horizontal sectional view taken along line 2-2 of FIG

<, 1, j

909841/1055

BATH

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The sander shown in the drawing includes
a pressure vessel 10 which is generally shallow
Has base 12, which has a dome «or bell-shaped
Housing 14 with a circular cross-section carries ₉ the housing
is provided with a lifting ring 16 that can be used
when the assembled pressure vessel 10 is moved and when the housing H is separated from or reunited with the base 12 ₀ Inside the pressure vessel 10, a; .Reservoir 18 for grinding material held in an elevated position
by a stand 20 in a position to gravity to an abrasive distributor 22 located therebelow
supply or empty as the contents of the "distributor" are measured and supplied through a funnel inlet 23 of the output line 24 leading to the nozzles _e One of these nozzles 21
is shown in Figo 1 ,, The abrasive material is through the
Lines 24 are carried by streams of air or any other desired gas which has been brought into pressure vessel 10 under j pressure via inlet 26 in base 12 " As in FIG Mg "represented 1 have the outlet conduits 24 each a, backwards-directed portion having the flexible tubes 25, which are \ connected to the base 12 by a threaded seat 27 '

The device according to the invention is advantageously used _; For grinding with alumina or glass powder "It can, however, [ also be used for any suitable finely divided or particularly hard material" to avoid encrusting the parts ». Hygroscopic water can be eliminated by placing the abrasive above 212 ° I? is heated and a dry ordered ^*: gergas "is fed into the pressure vessel 10 Furthermore, the possibility of corrosion j" observed For this reason [non-corrosive Sohleifmaterial as working material and!

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Stainless steel as the material for the device, especially preferable for the parts that come directly from the abrasive material to be touched »

The grinding process is carried out by propelling a stream of air or gas powered abrasive particles at high speed onto the surface to be abraded and the outlet ducts 24 flows »The ratio of grinding material to .gas is kept constant in order to ensure a uniform grinding action» With a uniform grinding action, is it possible thereby to regulate the amount of grinding carried out on a given workpiece? that the time is precisely determined ₃ in which the \ 7erk_stück is exposed to the flow of abrasive

In order to generate the flow at high speed, an air compressor (not shown) can serve as a source of air which has been compressed on the order of between 225 and 250 p ₉ s _e i and is supplied to the pressure vessel 10. Be it also könne.n gases other than air in the inventive grinding device uses "Yfeiterhin to low pressures, such as 80 p _o s _e l _e are used to alumina particles with approximately the same processing effect to wear _s such as by air with 225 poS" i _e carried glass particles, so the air pressure can be varied depending on the desired machining effect, it is conveyed from the source through an inlet 28 which is connected to a seat 30 on the screwed part of the inlet 26 in the base 12 _a one The baffle plate 32 serves to distribute the air flowing in and thus prevents the abrasive particles from scattering on moving mechanical parts. A suitable heating device, for example electrical type, can be placed on the inlet pipe 28.

909841/1055 8ADORlOlNA

1913

be arranged to heat the compressed air to about 140 ° F, in order to reduce their relative humidity. The current through the inlet supply pipe can be regulated by a manually operated valve 35 *

The housing 14 is secured to the base 12 in a fluid-tight manner by a bayonet lock which has interdigitated inner and outer rings 36 and 38 which are respectively attached to the rim of the housing and the surface of the base. The rings 36 and 38 have curved edges which overlap each other in opposite radial directions, the edges 40 of the inner ring 36 engaging the recesses 42 of the outer ring 38 in the unlocked position of these parts, but in the locked position shown in FIG Position, the edges 44 of the outer ring engage and overlap the edges 40 of the inner ring 36. To limit the relative rotational movement of rings 36 and 38 in locking: the assembly, a pair of stops 46 are provided in the assembly 180 degrees apart * by one; To form stop in the path of the parts of the inner ring 36 "The \ opening movement includes a movement of the inner ring 36 and the tJehäuses 14 in the counterclockwise direction, as shown in Fig. 2"

Sin handle 48 is connected to the inner ring 36, to the rotational movement of the inner ring and the G-ehäuseanord-; voltage to the outer ring 38 and the base assembly 12; when unlocking and locking these arrangements against each other!

ι to facilitate *

When the housing arrangement is locked in this way, an electromagnetically actuated tilt valve 50 in the inlet supply pipe 28 is kept closed with respect to the atmosphere . by an electric current flowing through a closed j

BAD ORIGINAL j

^ AttföifiO OAS o 9 8 4 1/1 0 5 S ~ ⁸ ~ ι

Microswitch 52 flows, is disposed on the outer ring 38 and is kept closed by operating its contact with a fixed on the inner ring 36 Finger 54, as shown in Fig. 1 and 2äargesteHt _p is In the unlocked position of the G-ehäuseteile / the Finger 54 lifted from the contact of microswitch 52. This causes the tilt valve 50 to open the inlet supply pipe 28 to the surrounding atmosphere.

An arrangement using a display will now be described releases or actuates another part when the supply of the abrasive material, in the reservoir to a predetermined Level is reduced or deflated «The stand 20 exists • from preferably four upright tubular legs 56, which are stiffened by upper and lower rings 58 and 60 « The upper ends of the legs 56 are arranged so that they meet the frustoconical lower wall 62 below the annular outer wall 63 of reservoir 18 is supported by upwardly pointing pistons 64 «Each piston 64 is slidably held in an upper part of the leg 56 belonging to it and upwards pressed by a compression spring 66 against a fixed stop 68 or some other form of stop surface is pressed. The springs 66 are chosen so that they mate Have spring properties or spring constants. ,, around the Raise reservoir 18 when the supply of abrasive material is in the reservoir is reduced, and thus the depressed from above switch lever 70 of a normally closed switch 72 set free to the electrical circuit through a tifarn lamp 74 to close when the reservoir 18 is almost empty. Likewise, the means described above, the cause an upward movement of the reservoir, used turn, to, if desired, in addition to the warning lamp 74 or

098 41/1055

or instead of these provided electrical arrangements or to endure

The distributor 22 for the abrasive material is disposed within the pressure vessel 10 and comprises a barrel 76 or other suitable container which is preferably open at the top and is mounted on a drive mechanism 78 for angular movement about a vertical axis. The bin 76 can with the; Antriebsmechanismus78 be connected by a bolt or other suitable means _e The barrel 76 has outlets in the form of tubes 80, which are arranged horizontally and the ring-, tangent-shaped tons wall "The bottom wall 82 of the barrel 76 is of the Kitte- downwardly bent »This causes the current of the; Abrasive material directed towards the outlet tubes 8o "The outer ones! Ends of the tubes 80 are positioned above the corresponding openings j of the funnel inlets 23 to the outlet conduits 24

With the above-described arrangement of the outlet pipes 80 and the funnel entrances 23 of the lines 24 results that it is advantageous to limit the angular movement of the bucket j 76 by the drive mechanism 78. In this Consideration is advantageously the extent of the angular movement; of the outer ends of the tubes 80 no larger than the arcuate. stood in the way of this movement over the upper end of the funnel j entrance 23o This causes the scattering of grinding material. kept to a minimum and a free flowing supply of this material into the inlets of the lines 24 allows the flow of air or gas as a carrier flow at the same time is let through «, · '-

The drive mechanism 78 is preferably a Syntron rotary transducer, which pivoted the barrel 76 in an inclined arcuate path about the axis of movement. The barrel is driven in this way 76 raised and rotated in a direction of movement so that

909841/10 55 * ■.

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the perpendicular force between bottom wall 82 and the abrasive material is increased ", the abrasive material fi is thereby in one conveyed tangentially through the tubes 80 in the reverse The direction of movement is the buoy 76 through the Meehaniss-i mus 78 reversed back in the same limited radians moved to the starting position “This arched path of movement however, provides reduced perpendicular force and thus little or no driving effect on the abrasive particles with himself.

The passages within each discharge tube to earth ground is kept free y / d _o h, free material of accumulated abrasive which vibrates in response to the movement of the manifold 22 by placing a loose wire part 84 "" In .Pig * 2 for reasons of clarity, only however, any tube 80 may be equipped with such a wire 84 as shown, "lines" are desired. The diameter of the wire member 84 can optionally be adjusted to produce the desired amount of flow through its associated tube 80. The flow area through a given tube 80 is reduced by a thicker wire member 84, and vice versa To set the relative flow rates of the abrasive flows which leave the barrel 76 * s / furthermore, by keeping the tubes 80 free, an immediate start of the abrasive flows after connecting the device is made possible. clear By bending the ends of the twisting element 84, this is held in its position [as shown during operation]:

When switching on the device, it may be desirable in; slowly introduce air into the pressure vessel until the desired Pressure is reached «Advantageously, this can be achieved v / er; den, by having a restricted line 86, for example with j 1/4 "diameter versus 1" diameter for inlet tube 28, j is used to bypass valve 35 «A throughflow valve

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til 88 is still required to regulate the flow through this siphon line »

9098 41 / TO 5 5

Claims (1)

DIETRICH LEWINSKY U PATENT ADVERTISER 18 "3" 1969 8 Munich 21 - Gotthardstr. 81 _{R (} - _{ni ττ / π} _ Phone 561 762 5501-II / He, Pennsalt Chemicals Corporation, Three Penn Center Plaza, Philadelphia 2, Pennsylvania, USA Claims; -. _; Grinding device with a number of nozzles supplied with gas-driven grinding material, with a pressure vessel that ^{can be supplied with:} compressed gas, with a reservoir for the | Abrasive material inside the pressure container with a container for the abrasive material which is also located inside the pressure container and which can be filled from the reservoir, and with a line between the abrasive material + container and each nozzle in which the gas-driven abrasive material is conveyed can, characterized in that! the grinding material container (76) in its angular position! a vertical axis is displaceable and has outlets (80) arranged about that axis such that ^; each outlet can supply an associated line (24) with abrasive material, Grinding device according to claim 1, characterized in that Drive means (78) are provided for vibrations of the grinding material container (76) about the axis. 1 or
Grinding apparatus according to claim 2, characterized in that the abrasive container (76-) is a barrel with an annular wall around the axis and in that each outlet (80) has a tubular part which extends generally tangentially to the annular wall. 909841/1055 4β 'grinding device' according to claim 2, characterized in that the Drive means a rotary oscillator, a drive connecting the grinding material container with the rotary oscillator. member and this have guide members leading in one movement in an inclined arc around the vertical axis, and in that the abrasive material container receives reciprocating drive pulses which lift the abrasive material out and eject from the outlets in a direction of arc movement, and to the home position after the ground movement returns in the opposite direction. 5 «grinding device according to one of claims 1 to 4, characterized in that that support parts for the reservoir (18) are provided which have a spring structure (64, 66), the push the reservoir upward against the weight of the abrasive material stored therein, and that the upward movement of the reservoir (18) when emptying the grinding material in a predetermined position to display this condition * organs effecting action are provided ", 6 »Grinding device according to one of claims 1 to 5, characterized in that that the pressure vessel (10) a. Base (12) and a side wall structure (14) used to form an access are separable from each other into the interior of the pressure vessel, and seals and a twist lock (36, 38) between Base and side wall and from the movement of the wall structure in locked or unlocked positions opposite the socket dependent switch (52, 54) for displaying the unlocked state of the wall structure compared to the Has base, 7. Grinding device according to claim 6, characterized in that in the line (28) supplying the pressure vessel with gas, a normally open valve (50) is provided which BATH ORISIHAL ~ 3 - 909841/1055 ~ 9- 1fr the switch (52, 54) to close the Gaeversorgungsleitung indicates when the wall structure (14) is not locked to the base (.12) » 8 "Grinding device according to claim 3 withdrawn from claim 2, characterized in that the corresponding inlet (23) of the conduits (24) is located below the outer ends of the tubular ' shaped parts (80) arranged openings for receiving of the sole material released from it to mix with Pressurized gas and transport to the corresponding nozzles (21). 9 «grinding device according to claim 3, characterized in that in each tubular part (80) runs through it extending wire (84) is loosely arranged, which it through Movement therein as a function of the angular movement of the Keeps the pressure vessel (76) free of deposited abrasive material « 10 «grinding device according to claim 8, characterized in that the ground movement of the outer. Ends of the tubular Parts (80) in one sight does not extend further than the arcuate movement of a tubular member across a assigned opening (23) » 11, grinding device according to claim 1, characterized in that Selectable heating elements (34) to be operated for heating the compressed gas are provided »■ BAD LOCAL SIGN 909841/105 5 Empty soap