JPH0569109A - Oscillating drum device - Google Patents

Abstract

PURPOSE:To prevent beat phenomena generated when two oscillating drums are placed closely to each other. CONSTITUTION:The unbalance weights 60, 61, 100, 101 of the oscillator of a 1st oscillating drum 51 and of the oscillator 96 of a 2nd oscillating drum 52 are brought into synchronous operation through 1st, 2nd, 3rd synchronizers A, B, C.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a vibrating drum.

[0002]

2. Description of the Related Art FIGS. 3 to 7 show a vibrating drum, which has been previously proposed by the present applicant (Japanese Patent Application No. 3-126576), designated by 1 as a whole. A shaker 3 is provided on the side. Further, the drum body 2 includes a vibration-proof spring 6 arranged on the columns 4a, 4b, 5a, 5b.
It is oscillatably supported by a, 6b, 7a, and 7b with a downward inclination of several degrees in the figure. FIG. 3 of the drum body 2
At the left end, there is formed a supply port 8 for supplying the casting to be sandblasted, and at the right end there is provided a discharge port 9 for discharging the sandblasted casting.

The drum body 2 has ribs 1 on its peripheral wall.
It is reinforced by 0, and the right end is partially closed by the lid 11.

Next, details of the vibration exciter 3 will be described with reference to FIGS. 4 and 6.

The vibration exciter 3 is a circular vibration exciter that generates a circular vibrating force, and is a mount 23 arranged laterally of the drum body 2.
An electric motor 24 is fixed on the upper side, and this is a drive source. A first link 25 connected to a universal joint mechanism at both ends of the rotary shaft 24a of the electric motor 24.
Are connected. That is, the rotating shaft 24a of the electric motor 24
Is the first link 2 via the universal joint 26a.
5 and its left end is connected to the first support shaft 29 via the universal joint 26b. The first support shaft 29 has a pair of bearings 28 fixed to both sides of a mounting plate 27 attached to the drum body 2.
The inner races a and 28b are fitted to each other, and an unbalanced weight 30a having a substantially semicircular shape as shown in FIG. 6 is fixed to one end thereof, and the other end of the first support shaft 29 is unbalanced. An unbalanced weight 30b having the same shape as the weight 30a is fixed.

The first support shaft 29 is further connected to a second link 31 and a second support shaft 35 via universal joints 32a and 32b, which is a mounting plate 33 mounted on the peripheral wall portion of the drum body 2. The pair of bearings 34a and 34b provided on both sides are inserted into and fitted to the inner races, and the unbalanced weight 36 having the same shape as the above-described unbalanced weights 30a and 30b is attached to both ends thereof.
a and 36b are fixed.

Further, according to the present apparatus, the center of the circular excitation force, that is, the straight line L-L that is perpendicularly connected to the drive shaft 25 and the axis C of the drum body 2 has an angle β with respect to the horizontal line H-H. It is set to 25 degrees. The height position of the mount 23 and the shape of the mounting plate 27 are set so as to obtain this angle of 25 degrees. Furthermore, according to the present example, the rotation direction of the electric motor 24 that drives the drive shaft 25 is driven so as to rotate clockwise in FIG.

The vibrator 3 is constructed as described above, but a pair of inspection windows 21a and 21b are further provided on the upper wall portion of the drum body 2.
Is provided, and as shown in FIG. 5, the drum main body 2
An arc-shaped dam plate 22 is fixed to a part of the inner wall near the discharge port 9.

The vibrating drum 1 is constructed as described above. Next, its operation will be described.

Although not shown, it is assumed that a casting to be deblasted is introduced from the material supply port 8. When the electric motor 24 is driven, the rotational force of the rotating shaft 24a rotationally drives the pair of unbalanced weights 30a and 30b via the universal joints 26a and 26b and the first link 25.
Further, the first support shaft 29 and the universal joint 32 to which the unbalance weights 30a and 30b are fixed.
a, 32b, an unbalanced weight 36 fixed to both ends of a second support shaft 35 coupled via the second link 31.
Similarly, a and 36b are rotationally driven. By the rotation of the unbalanced weights 30a, 30b, 34a, 34b, a centrifugal force, that is, a circular exciting force is generated around the axis of rotation of the unbalanced weights 30a, 30b, 34a, 34b.
The drum main body 2 vibrates by the exciting force in a mode described below. The rotating shaft 24a of the electric motor 24 is connected to the unbalanced weight 3 via the universal joints 26a and 26b.
0a, 30b, and the first support shaft 29 is connected to the unbalance weights 36a, 36b via the universal joints 32a, 32b, so that the vibration of the drum body 2 is almost transmitted to the electric motor 24. The rotation can be stably continued without being driven.

FIG. 7 shows the relationship between the axis C of the drum main body 2, the center of gravity G of the drum body 2 and the center P of the circular exciting force of the above-mentioned vibration exciter 3. A circular excitation force F as shown in FIG. 7 is generated, but a rotation moment is generated around this and the center of gravity G, and the drum main body 2 is moved according to the distance from the center P of the excitation force F. Is indicated by a circle as a line, and the vibration mode as illustrated is performed on this circumference. That is, on the peripheral wall portion of the drum main body 2 closest to the vibration exciter 3, elliptical vibration as shown by a ₁ , a ₂ , a ₃ , and a ₄ is performed, but its major axis and minor axis are different from other peripheral wall portions. And its major axis is inclined from the substantially vertical direction to the counterclockwise direction. Further counterclockwise tangentially to b _1, b _2, b ₃ and has performed the linear vibration and elliptical vibration as shown by b ₄ directions drum wall of the major axis in the bottom wall portion of the drum body 2 It is inclined to have a vibration transfer force in the direction.

At a point near the top of the vibrating drum main body 2, elliptical vibration is performed as indicated by d ₁ , d ₂ , d ₃ ... It becomes small, and the above-mentioned vibrations b ₂ , b ₃ , b ₄ , c ₁ , c ₂ ...
.. is an elliptical vibration that rotates clockwise in FIG. The vibrations d ₁ , d ₂ and d ₃ are also elliptical vibrations and are vibrations that rotate in the clockwise direction, but the direction of the major axis thereof is almost parallel to the tangent line of each point on the peripheral wall surface of the drum body 2, and therefore The transfer force due to vibration is almost none, although the material does not rise to this point. And in FIG.
Approximately 1 when viewed from the vibration a ₁ about the axis C in the counterclockwise direction
At the angular position of 70 degrees, linear vibration is performed as indicated by vibration e. From this angular position, elliptical vibrations f ₁ , f ₂ ,
The major and minor axes of f ₃ and f ₄ are sequentially increased, but the rotation is counterclockwise, and linear vibration b ₁ is again generated at the bottom of the vibrating drum main body 2, and counterclockwise from this angular position. The elliptical vibration is again performed in the direction as described above, but the rotation direction is the clockwise direction.

The casting M supplied from the material supply port 8 receives the above-mentioned vibration from the inner wall portion of the drum main body 2 and inclines downward by about 2 to 3 degrees in FIG. While being transferred, the casting M receives a force that rises counterclockwise in FIG. 7 along the inner peripheral wall surface of the drum main body 2 as shown in FIG. Becomes larger and casts downwards M
It slides down along the upper surface of the upper layer, and again moves along the inner peripheral wall surface as shown by the locus Q while being moved to the right in FIG. , And is discharged to the outside through the discharge port 9.

The shaft center C of the vibrating drum main body 2 is applied to the casting M, which is supplied at the filling rate as shown in FIG.
3 is transferred to the right in FIG.
Dimensionally, it is sufficiently sanded while receiving a spiral stirring force, and its latent heat is dissipated as the moisture from the casting evaporates, so it is efficiently cooled and flows outward from the discharge port of the drum body. Is discharged.

As described above, the vibrating drum 1 previously proposed by the applicant of the present invention has an action and an effect which are superior to those of the conventional vibrating drum.
If the bases are arranged close to each other as shown in FIG. 8, for example, they are connected in series, the following problems occur.

In FIG. 8, the vibrating drum 1A and the second vibrating drum 1B connected in series to the vibrating drum 1A are constructed in the same manner as the vibrating drum 1 described above.
Exciter 3A and 3B having 2B and similar to the exciter described above
Is equipped with. The vibrating drums 1A and 1B have the same structure in principle, although there are some differences from the vibrating drum 1 described above. However, in the first vibrating drum 1A, the exciter 3
Unlike the vibrating drum 1 previously proposed, A is fixed to the peripheral wall portion below the outer peripheral wall portion, and is the second vibrating drum 1B.
Then, it is mounted at almost the same angular position as the above-mentioned proposed example. Supply port Y formed at the left end of the first vibrating drum 1A
When the casting and the molding sand are supplied to the second vibrating drum 2 from the discharge port 9A in the same manner as the proposed example.
Supplied to B. The same effect is exerted here as well, and the casting sand and the casting that have been sufficiently cooled and deblasted are discharged from the discharge port 9B to the outside.

The exciter 3A and the exciter 3B are driven by the induction motors 24A and 24B, respectively, via the flexible shaft as described above, and the induction motors 24A and 24B have a common commercial AC power source. These induction motors 24A, 24B are connected to
If there is four poles and the frequency of the commercial AC power supply is 50 Hz, slips will occur depending on the load.
R. P. M. The vibrators 3A and 3B are driven in the vicinity. In such a driving state, a growl occurs in the surrounding environment, and environmental pollution occurs in which windows and floors of various buildings rock with the growl. The result of actual measurement of this growl is shown in FIG. That is, since there is a slight difference between the frequencies of the vibrators 3A and 3B, when the sound waves emitted from the vibrators overlap with each other, a growl due to interference occurs as is well known. This growl is level 80db and 10
It occurs as shown in FIG. 9 between 0 db. This causes the windows and floors of nearby buildings to rattle.

[0018]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and even when two vibrating drums are arranged close to each other, the above-mentioned growl does not occur in the surrounding environment. It is an object to provide a vibrating drum device.

[0019]

[Means for Solving the Problems] The above object is to attach an unbalanced weight to the first rotating shaft, and to fix the first shaker, which generates an exciting force by this rotation, to the outer peripheral wall thereof. The unbalanced weight is attached to the first vibrating drum and the second rotating shaft, and the second exciter that generates an exciting force by this rotation is fixed to the outer peripheral wall portion of the first vibrating drum. In a vibrating drum device including a second vibrating drum arranged close to the vibrating drum, the first rotating shaft and the second rotating shaft are connected via a gear and a timing belt, or by a gear coupling. This is achieved by a vibrating drum device characterized by being driven to rotate in synchronization.

[0020]

In each of the first and second vibrating drums, the respective exciters having the rotating shaft to which the unbalanced weight is fixed are driven completely in synchronization by the timing belt or the gear coupling. Therefore, the frequencies of the sound waves generated from the first and second exciters are the same. Therefore, the growl does not occur, and the growl is not adversely affected.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibrating drum device according to an embodiment of the present invention will be described below with reference to FIGS.

The entire apparatus is shown in FIG.
The vibrating drum 51 and the second vibrating drum 52 are connected in series in close proximity to each other. In the first vibrating drum 51, the drum main body 53 is configured in the same manner as the conventional one, but an induction motor 56 is mounted on one side on a frame 55 arranged on the ground, and its rotating shaft is a flexible shaft 57. It is connected to the first vibrator 58 via. The first shaker 58 has a casing 59, which is the drum body 5.
It is fixed at 3. The casing 59 includes gears and bearings meshing with each other, and the unbalanced weight 6 having a substantially semicircular shape on the rotating shaft supported by the one bearing.
1 is fixed, and its rotating shaft is coupled to the flexible shaft 57 described above. An unbalanced weight 6 of the same shape is formed on the other rotating shaft in the casing 59.
0 is fixed, and these are engaged with each other by a gear contained in the casing 59 and are configured to rotate at the same speed in opposite directions. The rotary shaft to which the unbalanced weight 61 is attached projects outward from the casing 59, and this is connected to the first synchronizer A via the flexible shaft 62.

The entire first synchronizing device A is constructed on a frame 63 supported on the ground, and the above-mentioned flexible shaft 62 includes a pair of bearing housings 64.
a and 64b are connected to one end of a rotary shaft 65, both ends of which are supported, and a splined gear 66 is fixed to the other end, and a rotary shaft 69 is a pair. Both ends thereof are supported by the bearing housings 68a and 68b, and a gear 70 having a spline cut on the outer peripheral portion is similarly fixed to the other end. A timing belt 67 is provided between the gear 66 and the gear 70 described above.
Is wound as shown.

Further, a gear 71 is further fixed to the other outer end of the rotary shaft 69, and this and the bearing housing 7 are fixed.
A timing belt 72 is wound around a gear 75 fixed to one end of a rotary shaft 74 whose both ends are supported by 3a and 73b. Further, a gear 75 is attached to one end of the third rotating shaft 74. The first synchronizer A is configured as described above.

Next, the second synchronizer B will be described.

Similarly, the frame 80 is also supported on the ground, the rotating shaft 78 is supported by a pair of bearing housings 79a and 79b mounted on the frame 80, and the gear 77 is fixed to one end thereof. A timing belt 76 is wound between the gear 75, which is the transmission element at the final end of the first synchronizer A.

The other end of the rotary shaft 78 is fixed to a second rotary shaft whose both ends are supported by a pair of bearings 84a and 84b via a flexible shaft 81. These are provided on a frame 82 supported on the ground.

Next, the third synchronizer C will be described.
The rotating shaft 88 is supported at both ends by bearing housings 89a and 89b on the side wall of the relatively high frame 200, and the gear 87 is fixed to this one end. A timing belt 86 is wound around the gear 85 which is a transmission element. A gear 90 is also attached to the other end of the rotary shaft 88, and is fixed to one end of the rotary shaft 92 whose both ends are supported by a pair of bearing housings 93a and 93b on the upper wall surface of the frame 100. A timing belt 91 is wound around the gear 92.

The third synchronizer C is constructed as described above. The other end of the rotary shaft 94, which is the final transmission element, is subjected to the second vibration through the flexible shaft 95. Machine 96.

The second vibration exciter 96 is also constructed in the same manner as the first vibration exciter 58, and has a casing 110 in which a bearing, gears meshing with each other, and the like are built in, and one of the rotary shafts has the above-mentioned structure. Is connected to a flexible shaft 95, and a semicircular unbalanced weight 100 is attached to this shaft. One end of this rotary shaft is the flexible shaft 9
It is connected to the rotating shaft of the induction motor 98 via 9.
An unbalanced weight 101 of a similar shape is fixed to the end of the other rotary shaft that is fitted with another gear that meshes with the gear that is fixed to the rotary shaft that is fitted with one unbalanced weight 100. ing. As with the first shaker 58, these unbalanced weights 10
0 and 101 are configured to rotate at the same speed in opposite directions. The induction motor 98 described above is mounted on a tall frame 112.

A vibrating drum device 51 according to an embodiment of the present invention.
Is configured as described above, and its operation will be described next. It is assumed that the induction motors 56, 98 are connected to the same commercial AC power supply. When the power is turned on, the first vibration exciter 58 is driven via the flexible shaft 57, and the pair of unbalanced weights 60 and 61 rotate in the opposite directions at the same rotation speed. A linear vibration force is generated in a direction perpendicular to a straight line connecting the axis of the rotating shaft, and this linear vibration force is applied to the peripheral wall portion of the drum main body 53, and is circulated while stirring, for example, foundry sand in the drum main body 53 as in the conventional case. Let Now, let us say that the direction of the rotation axis of the induction motor 56 is the direction indicated by the arrow R. That is, the induction motor 56
Rotate clockwise as seen from behind. In the same direction, the turning force in this direction passes through the flexible shaft 62, the synchronizing device A, the second synchronizing device B, and the third synchronizing device C to the flexible shaft 95 of the second vibrator 96 in the same direction. Communicate with.

The rotation of the other induction motor 98 is also rotationally driven in the Q direction, which is the same direction as the rotation direction R of the first induction motor 56, and the induction motors 56 and 98 have the number of poles of 4 poles. If there is a commercial AC power supply of 50 Hz, slip will occur depending on the load.
0R. P. M. It rotates in sync with. The first and second vibrating drums 51 and 52 have the same effect as in the conventional case, but according to this embodiment, the first vibration exciter 58 and the second vibration exciter 96 are exactly the same. A sound wave as shown in FIG. 2 is transmitted to the surrounding environment in order to generate a linear vibration force synchronized with the frequency. As can be seen from the figure, the growling decrease has almost disappeared.

The embodiment of the present invention has been described above.
Of course, the present invention is not limited to this, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, the gears having splines on the outer circumference and the timing belt wound around these are synchronized to synchronize the vibrators 58 and 96 of the first and second vibrating drums 51 and 52. Although the timing belt is not used in place of such a synchronizing device, the first vibration exciter and the second vibration exciter are generated by the engagement between the gears fixed to the respective rotary shafts and the gears. May be operated synchronously.

In the above embodiment, the first and second vibrating drums 51, 52 are described as being connected in series close to each other, but they are connected in parallel, and the casting and the casting sand are respectively fed from the respective discharge ends. It may be discharged.

[0036]

As described above, according to the vibrating drum device of the present invention, even if the first and second vibrating drums are arranged close to each other, the growl which has been conventionally generated in the surrounding environment does not occur at all. You can

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a vibrating drum device according to an embodiment of the present invention.

FIG. 2 is a graph showing an operation of the vibration drum device.

FIG. 3 is a side view of a vibrating drum previously proposed by the applicant.

FIG. 4 is a plan view of the same.

FIG. 5 is a front view of the same.

FIG. 6 is a partially enlarged front view of the main part.

FIG. 7 is a schematic front view of a vibrating drum for explaining the operation of the apparatus.

FIG. 8 is a side view showing an example in which two vibrating drums having a similar structure are arranged close to each other.

FIG. 9 is a graph showing howling of the vibrating drum device.

[Explanation of symbols]

 51 First Vibration Drum 52 Second Vibration Drum 56 Induction Motor 58 First Exciter 60 Unbalance Weight 61 Unbalance Weight 66 Gear 67 Gear Timing Belt 70 Gear 71 Gear 72 72 Timing Belt 75 Gear 76 Timing Belt 77 Gear 78 78 Rotation Shaft 84 bearing 85 gear 86 timing belt 87 gear 90 gear 91 timing belt 96 second vibrator 98 induction motor 100 unbalanced weight 101 unbalanced weight A first synchronizer B second synchronizer C third Synchronizer

Claims (1)

[Claims] 1. An unbalanced weight is attached to the first rotating shaft,
A first vibrating drum having a first vibrating machine that generates a vibrating force by this rotation is fixed to the outer peripheral wall of the first vibrating drum, and an unbalanced weight is attached to the second rotating shaft. The second vibration generator that generates the
In a vibrating drum device including a second vibrating drum disposed in proximity to the vibrating drum, the first rotating shaft and the second rotating shaft are connected via a gear and a timing belt, or a gear coupling. The vibrating drum device is characterized in that it is driven to rotate in synchronism with each other.