DK141356B - Machine for grinding objects during tumbling. - Google Patents

Description

(ft?) \ 22 / OD PUBLICATION REFERENCE 1M356 DENMARK (B1>, nt * cl'3 B fc 3/30 // b ik b 31/02 (21) An «#gning No 5099/73 (22) Submit« on September 18, 1973 (23) Running day 18. 1973βρ 1973> ✓ (44) The note presented and the presentation document published on 3 · mRT * 1 98Ο

DIRECTORATE OF

PATENT AND TRADEMARKET (3 °) Morph «requested from it

19 sep. 1972, 290392, US

(71) HELEN HAZEL WALKER, 607 Charlton Street, Valdosta, Georgia, US.

(72) Inventor: Same.

(74) Plenipotentiary under Aagena Process:

International Patent Office.

(64) Machine for grinding objects during tumbling.

The invention relates to a machine for grinding objects during tumbling, comprising a cylindrical basket which can be rotated about its longitudinal axis within a closed housing with an opening and adapted to be moved from an operating position inside the housing to a filling and emptying position outside the housing and having a limb as well as a swivel basket holder which, by means of holding rods, holds the end walls of the basket along their periphery and turns the basket within the housing driven by a drive motor.

From US Patent No. 3,540,155, a machine of this kind is known which comprises two vane-like blades throwing abrasive grain upwards against a cylindrical rotating basket containing workpieces. The workpieces whose surface is to be treated are tumbled within the basket and the thrown abrasive grains pass through perforated walls of the basket and hit the various surfaces of the workpieces which are tumbled within the basket to be cleaned or polished.

The workpiece basket and vane blades are located inside an outer housing, which serves to absorb the abrasive grains for recycling and renewal, as well as to prevent dust and grain from polluting the atmosphere. The front of the housing is provided with an opening and the basket with a limb which allows the workpieces to be placed in and removed from the basket.

The arrangement for reading and emptying the basket has various shortcomings in this known machine. With the known machine it is necessary to manually load and empty the basket and this requires that you can reach into the machine's housing itself to place and remove workpieces. The manual handling of workpieces, especially during emptying, is undesirable for various reasons. First, emptying requires a considerable amount of time, as the individual workpieces must be removed manually. This results in undesirable delays, in particular how very small workpieces need to be processed. Second, the weight, temperature, and shape of the workpieces can overstretch or damage the operator. Furthermore, at the end of a blowing process, the atmosphere inside the machine may be filled with floating dust and abrasive grains, and in such cases the operator must ensure that he does not inhale this dust and these grains or get the dust or grains in his eyes.

The invention aims to eliminate the aforementioned shortcomings of the known machine and to separate it from the fact that the basket holder is connected to at least one of the end walls of the basket by means of a hinge and a releasable latch and that the hinge is located at a distance from the axis of rotation of the basket holder. .

In a machine according to the invention, a workpiece basket is automatically emptied by dumping at the end of a grinding or blowing process. This dumping takes place by rolling the workpiece basket out of the housing to a position where the basket is emptied without the operator having to lift the basket, and the movement of the basket and the reading is performed simply by controlling the turning engine of the basket in the machine so that the operator actually do not need to be near the machine.

In emptying the machine according to the invention, the advantage is that the weight of the goods in the basket moves as it rotates.

The basket is rotated slightly in the normal working direction after the U1356 3 releasable latch is released, and continued rotation causes the center of gravity of the goods to move relative to the hinge connection between the basket and the basket holder. In this way, the weight of the goods causes the curve to swing about the hinge connection, so that the rollout of the curve from the machine begins. The basket then falls on support or guide rails along which it rolls out of the machine. Then the direction of rotation is reversed and the rotation is continued for approx. 90 ° until the curve reaches its maximum unfolded position.

When emptying is complete, the basket holder is rotated in its normal working direction and the basket rolls back until its axis of rotation aligns with the axis of rotation of the basket holder. With the basket in this position it can be pushed fully into place in its working position or the basket holder can be rotated a little further until the weight of the basket brings it fully aligned with the basket holder. The releasable latch is put back in place and the basket can be refilled and a new grinding process started.

To limit the roll-out of the basket, an arm which is hinged at the ends of the basket holder and the basket can be used, respectively.

To limit the relative rotation between the basket and the basket holder, one hinge connection may be constituted by a longitudinal slot at one end of the arm, which slot cooperates with one of the retaining rods of the basket holder.

The releasable latch may comprise a removable holding rod which extends across the limb of the basket and which keeps it closed during rotation of the basket within the housing.

The hinge between the basket and the basket holder can simply be constituted by one of the holding bars which pass through openings in the one-wall of the basket.

The invention will be explained in more detail below with the aid of an embodiment of a machine according to the invention and with reference to the drawing, in which fig. 1 is a front view of a machine according to the invention with certain parts removed; FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, FIG. 3 is a perspective view of a basket for workpieces and the bearing arrangement of the basket in the machine of FIG. 1 and 2, and FIG. 4-7 are schematic views of relative positions between the curve and its bearing arrangement during successive steps of reading the curve in the machine of FIG. 1 and 2.

141356 4

Pig. 1 and 2 show a machine comprising an outer housing 10 consisting of an upper wall 12, two side walls 14 and 16 (Fig. 1), a bottom 18, a back wall 20 (Fig. 2) and a front wall 22 (Fig. 2). . The front wall 22 has an opening 24 in its upper region and this opening is closed by a limb 26 during normal operation of the machine.

A cylindrical basket 28 for receiving workpieces is mounted within the upper region of the housing 10 for rotation about a horizontal shaft 30 extending between the side walls 14 and 16. The basket 28 has a cylindrical outer wall 32 of perforated or open construction, such that it may at the same time contain workpieces to be processed and allow the hail or abrasive material to be thrown against the basket and pass through the outer wall and hit the workpieces. Disc-shaped end walls 34 cover the opposite ends of the cylindrical outer wall 32. These end walls have a slightly larger diameter than the end walls of the cylindrical outer wall 32. Hold bars 36, 38, 40 and 42 extend between the end walls 34 just outside the outer wall 32. These bars comprise a rod 36 for closing a limb in the basket, a hinge rod 38 for the basket, a permanent holding rod 40 and a rod 42 for limiting the roll-out of the basket. All of these rods are connected at opposite ends to a basket holder comprising pivotal support members 44 located within housing 10 near the end walls of the basket 34. The pivotal support members 44 are also disc-shaped and have hubs 46 projecting outwardly from their centers. . These hubs pass through the side walls 14 and 16 of the outer housing and are supported for rotation by bearings 48.

A reversible drive motor 50 for the basket is mounted on the machine and connected via sprockets 52 and 54 and a drive chain 56 to one of the carrier elements 46. In this way, the motor 50 can rotate the rotatable support elements 44, and these elements rotate the basket 28 via the various holding rods. 36, 38, 40 and 42.

Two impeller wheels may have shafts 60 supported in bearings 62.

As shown in FIG. 2, a motor 64 for driving the impeller wheels is connected by pulleys 66 and 68 and a belt 70 for the shafts 60 so that the impeller 58 is driven so that they swirl hail or grain up against the basket 28.

The impeller 58 is positioned within an impeller housing formed by vertical walls 72 arranged upwardly of the impeller impellers in the lower portion of the housing 10. Funnel walls 74 extend outward and upward from the sides of the impeller housing just above shafts 60. These hopper walls collect used hail which falls from the basket 28 and guides them through openings 76 in the vertical walls 72 into the path of the vanes so that they can again be thrown up against the basket 28 by the vane wheel.

A vacuum system not shown is used to remove dust and grains that are too fine to be reused. At the rear of the housing is a separator 77 and it is connected to the suction system through a suction line 78.

In FIG. 3 it will be seen that the end walls 34 of the basket 28 are formed with notches or notches 80 and 82 for the retaining rods and these notches are open against the perimeter of the end walls. The notches 80 and 82 are located diametrically opposite one another on the end walls 34, and they receive the rod 36 for locking the limb and the permanent rod 40. It should be noted that the hinge rod 38 does not pass through a notch, but instead passes through the hinge openings 84. These apertures are composed of two notches 84a and 84b in the end walls 34 of the basket and in removable plates 85 mounted on the end walls. If the end plates 85 are removed, the basket can be removed by the hinge rod for repair or replacement.

Diametrically opposite the hinge apertures 84, other notches 86 are provided on the circumference of the end walls 34 which receive the roll-off restricting rod 42.

A roll-off limiting arm 88 is disposed on each side of the basket 28 between the end walls 34 of the basket and the associated pivotal support members 44. The lower ends of these arms 88 are hingedly connected to the end walls 34 of the basket at a location approx. halfway in the circumferential direction between the hinge opening 84 and the permanent bar notch 82 and at a distance from the center of the end wall of approx. 3/4 of the radius of the end wall. The upper end of the arm 88 has a slot 90 which accommodates the roll-off limiting rod 42. As the lower ends of the arms 88 are hinged on the end walls 34 in places which are set relative to the centers of the walls, the upper end of the arms 88 and the rod 42 carried therefrom by rotating the arms relative to the end walls 34 follows an arc which cuts its periphery in the notches 86, as shown in FIG. 3. If the arms are rotated in a counterclockwise direction to the end wall 34, the rod 42 will release from the notches 86. It should be noted that the notches 86 have an asymmetrical configuration with an edge of the notches cut to an inclined surface on the non-drive side of the notches. this relative movement between the end walls 34 and the rod 42.

A segment of the cylindrical outer wall 32 of the basket 28 is hinged longitudinally to the other portion of the wall along a hinge line 92 for loading and unloading the basket.

This flap 94 is located at the rod 36 which can lock the flap and keep it closed during machine operation.

The rod 36 is removably attached to the pivotal support members 44. Any suitable form of detachable connection can be used. Such an arrangement is shown, for example, in detail in FIG. 4 of the drawing for Danish Patent Application No. 2377/71.

This arrangement uses steel leaf springs on the outside of the support members of the rod to cover the holes in the elements through which the rod passes. The rod is removed by longitudinally pressing one of the leaf springs until the other end of the rod is free of the hole in the opposing member. The freed rod is guided away from its element, and the rod is then moved longitudinally in the opposite direction to release it from the other element. The basket's limb can now be opened. Such leaf springs 96 are shown on the outside of the support members 44 in FIG. First

Two guide rails 98 for the roll-out of the basket are located below the end walls 34. As shown in FIG. 2, these extend from a vertical line which intersects the normal axis of the curve to the lower edge of the housing opening 24. When the curve 28 is in its normal operating position and is carried by the pivotal support members 44 as shown in FIG. 2, the end walls 34 are located a small distance, e.g. 15 mm, above the guide rails 98.

A return mechanism for reversing the curve is shown in connection with the one guide rail 98 in FIG. 3. As can be seen, one of the rails is formed with a longitudinal slot 100 in which lies a lifting plate 102. The outer end of the lifting plate rests on a chest 104 just below the front edge of the slot 100. The inner end of the lifting plate is rotatably mounted on the guide rail and connected to a crank arm 106 which can swing the lifting plate from a position in which it aligns with the rail 98 to a position where it lifts the curve as seen in FIG. 3. This movement can be used to lift the curve from the guide rails 98 and approx. 15 mm up to the supporting elements 44.

During normal operation of the machine described above, the basket 28, containing workpieces, which is carried by the supporting elements 44 within the housing 10, as shown in the fully drawn line in FIG. 2, while the impeller 58 swirls abrasive grains up against the basket. The workpieces are tumbled into the basket and purified or otherwise processed by the particles passing through the perforated cylindrical wall 32 of the basket.

When processing is complete, the latch 26 is opened and the locking rod 36 is removed as explained above. The basket is then moved from its fixed, flush position, as shown in FIG. 2, for a reading position out through the opening 24, as shown in the dashed line in FIG. 2. The lane 94 in the basket is pivoted down by gravity and the workpieces not shown automatically dump out of the basket and into a suitable container or container which may be located in front of the machine.

The outward movement and emptying of the basket 28 are activated and controlled only by the drive motor 50 of the basket which operates in connection with the pivotal support members 44, the holding bars 38, 40 and 42 and the roll-out limiting arm 88. The way in which these elements work together generation of this roll-out will be explained below.

FIG. 4-7 schematically illustrate the mechanical rod system which causes the curve to roll out to a reading position by controlling the rotation of the curve.

As shown in FIG. 4, the curve is supported by its end walls 34 which rest within the holding bars 36, 38, 40 and 42. These rods, which are held at the ends by the pivotal support members 44, are rotated by these elements about the axis of the curve and thus rotate the curve in clockwise as shown by arrow A.

To begin the reading phase of the basket, the rotation of the basket with the limb 94 facing the opening 24 of the housing is stopped, ie. to the right in FIG. 4. As explained above, the rod 36 for the limb locking is removed and the curve 28 is rotated a little more clockwise to the position shown in FIG. 5th

This small additional rotation moves the center of gravity of the goods in the clockwise direction relative to the hinge rod 38, as shown by arrow B. This causes a swing of the curve in the clockwise direction about the rod 38, as shown by the arrow C. Then the rod 36 for locking the the door is removed, there is no obstacle to the oscillation in the direction of arrow C, and the curve 28 oscillates about the rod 38 from its location between the pivotal support members 44. This oscillation of the curve is stopped by the guide rails 98 as shown in FIG. 6. It should be noted that the holding rod notches 82 allow the end walls 34 to pivot away from the permanent rod 40. Likewise, the asymmetrical notches 86 allow the end walls 34 to pivot and free from the rod 42, while the slots 90 in the roll-out limiting arms 88 allow the pin, at which their lower ends are hinged on the end walls 34, to describe a circular arc about the hinge rod 38 and hence the curve to make the initial roll-out movement.

At this point, the rotational direction of the pivotal support members 44 is turned from clockwise to counterclockwise as shown by arrow D in FIG. 6. The only pivotal connection at this point between the pivotal support members 44 and the end walls 34 of the basket is via the hinge rod 38, so that the reverse rotation of the pivotal support 44 provides a force in the direction of the arrow E via the rod 38 on the end walls 34. the end walls 34 are now in rolling engagement with the guide rails 98, the force indicated by the arrow E gives an oscillation in the clockwise direction indicated by the arrow F about the contact points between the end walls 34 and the guide rails 98. This swing causes the curve 28 to roll outwards along the guide rails 98 to the reading position shown in FIG. 7th

The outward rotation of the curve is continued by maintaining the clockwise rotation of the pivotal support members 44 until the unrolling rod 42 is brought to a position where it reaches the outermost end of the slot 90 in the unrolling arm 88 as shown in FIG. 7. This prevents the basket from rolling beyond the ends of the guide rails 98. If necessary, or if desired, the rotation of the pivotal support members 44 in the clockwise direction can be continued so that the basket 28 is lifted free of the guide rails and supported only by the pivotal support members 44, partly by means of the rod 38 and partly by means of the roll-out restricted rod. 42 and the arms 88.

When the basket 28 is emptied, it can be returned to its initial position by rotating the base elements 44 in the clockwise direction until the curve is rolled back along the guide rails to the position of FIG. 6. At this point, the crank arm 106 is actuated by the return mechanism of the basket (Fig. 3) to pivot the lift plate 102. The lift plate engages one of the end walls 34 of the basket and lifts the curve to its axis of rotation with the rotational axis 44 of the rotary base elements. at that time, the pivotal support members 44 are pivoted to a position slightly lower

Claims (5)

Further towards the clockwise direction of the position shown in FIG. 4, so that the curve 28 is rotated about the hinge rod 38 toward the permanent rod 40. The curve can then be unloaded without rolling out from its location between the support members. After filling, the latch 94 is closed and the locking rod 36 is replaced again for a new treatment phase. The influence of the lifting mechanism can possibly be eliminated during the return phase of the basket. This can be done by continuing rotation in the clockwise direction of the pivotal carriers almost a full turn after the curve has reached a position where the lifting mechanism should have been affected. This continued rotation will eventually bring the center of gravity to a position where its self-weight will force it into the rest position between the holding bars. Thus, it is possible to obtain both roll-out for reading and return for filling the basket without the use of manual labor. A machine for grinding objects during tumbling, comprising a cylindrical basket (28) that can be rotated about its longitudinal axis within a closed housing (10) with an opening (24) and adapted to be moved from an operating position within the housing for a filling and emptying position outside the housing, having a limb (94), and a rotatable basket holder (44) which, by means of holding bars (36, 38, 40, 42.) holds the end walls of the basket along their periphery and turns the basket within the housing driven by a drive motor (50), characterized in that the basket holder (44) is connected to at least one of the end walls of the basket (28) by means of a hinge (38, 84) and a releasable latch (36) and that the hinge is spaced apart from the axis of rotation of the basket holder (44). Machine according to claim 1, characterized in that the basket (28) is hinged on the basket holder (44) at both end walls. Machine according to claim 1 or 2, characterized by a roll-off limiting arm (88) which is hinged at the ends of the basket holder (44) and the basket (28) respectively. Machine according to claim 3, characterized in that one hinge connection is constituted by a longitudinal slot (90) at one end of the arm (88), which slot cooperates with one of the retaining rods (42) on the basket holder (44), Machine according to any one of the preceding claims,