KR100208866B1 - Vibratory drum - Google Patents

Abstract

The present invention relates to a vibratory drum which is particularly suitable for use in sand removal attached to castings. Vibrating drum according to the present invention is a straight line connecting the center of the circular vibration force generated by the rotation of the unbalanced weight (30a, 30b), (136a) (136b) and the axis of the drum body (2) and the horizontal line The circular oscillator 130 is fixed to the circumferential wall of the drum body 2 so that the angle formed is about 25 degrees, and the excitation force becomes larger on the material inlet side.

This vibration drum has a small decrease in the amplitude of each part even under load, and promotes the circulation of the casting to be sand-depleted as a whole, thereby increasing the throughput of the material, for example, the casting to be sand-depleted.

Description

Vibratory drum

1 is a plan view of a vibration drum according to a first embodiment of the present invention.

2 is a side view of a vibration drum according to a second embodiment of the present invention.

3 is a side view of a vibration drum according to Embodiment 3 of the present invention.

Figure 4 is a side view of the vibration drum proposed by the applicant.

5 is a plan view of the same.

6 is the same front view.

7 is a partially enlarged front view of the recess.

8 is a simplified front view of a vibration drum for explaining the operation of the proposed example.

9 is a graph showing a comparison between the ultra-low frequency noise of the conventional vibration drum and the vibration drum of the proposed example.

10 is a side view of a conventional vibration drum.

11 is a cross-sectional view taken along line [10]-[10] in FIG.

12 is a cross-sectional view of another conventional vibration drum.

Fig. 13 is an enlarged partial cutaway side view of the main portion of the conventional example.

14 is a schematic cross-sectional view for explaining the operation of the conventional example.

FIG. 15 is a diagram schematically showing a vibration drum of the proposed example. FIG.

16 is a schematic diagram showing the action.

* Explanation of symbols for main parts of the drawings

2: drum body 30a, 30b: unbalance weight

73, 130: excitation 136a, 136b: unbalanced weight

M ₁ , M ₂ , M ₃ : Vibration Motor

The present invention relates, for example, to vibration drums, which are most suitable for use in mixing, drying, cooling, etc. of materials in a scattered form, and particularly suitable for use in sand removal on castings.

10 and 11 show a vibrating drum used for removing sand adhered to a casting of the prior art, in which the vibrating drum is denoted by the reference numeral 70 in its entirety, and the substantially cylindrical drum body 71 is formed. On the side, the drive attachment frame 72 is fixed to the support 75 through a resonating drive spring 74, and the support 75 is provided through a plurality of attachment ribs 86. It is fixed to the drum body 71.

In FIG. 10, a supply port 85 is provided at the left end of the drum body 71 to supply a casting to be sand-depleted, and an outlet 84 for discharging the sand-deleted casting is provided at the right end. Formed.

Both sides of the drum body 71 are closed by end walls 82a and 82b.

The whole drum body 71 is vibrated on the ground E by vibration damping springs 76a, 76b and 77a, 77b.

An excitation source 73, which is a pair of vibration motors 79a and 79b, is fixed to the frame 72 as a drive unit.

The vibratory motors 79a and 79b are configured as known, but almost semi-circular unbalanced weights 80a and 80b are fixed to the rotary shafts 81a and 81b, and these are fixed to the reinforcing partition 83. Although symmetrically fixed to the frame 72, the unbalanced weights 80a and 80b are fixed to the rotation shafts 81a and 81b in the same rotational phase.

The upper wall portion of the drum body 71 is fixed with a duct 78 for dust collection, and communicates with the internal space 87 to remove sand in the drum body 71 as described later. It is trying to guide the dust to the outside.

The entire vibrating drum 70 is inclined several degrees downward toward the outlet 84.

The vibrating drum 70 of the prior art is constructed as described above. When the excitation unit 73 is driven, the vibrating motors 79a and 79b rotate synchronously, which is the spring constant of the driving spring 74 and the drum. The pair of vibration motors 79a, 79b are rotationally driven as a frequency close to the resonance frequency determined by the mass of the entire body 71, the mass of the excitation portion 73, and the like.

This rotation generates a linear vibration force in the extending direction of the spring 74, which is transmitted to the drum body 71 through the spring 74 and the support 86.

The drum main body 71 is vibrated by the anti-vibration springs 76a, 76b and 77a, 77b so that it vibrates in a direction inclined in the direction indicated by the arrow, whereby the drum main body 71 is The casting M and the sand S in the inner space 87 undergo a circular motion as indicated by the arrow.

And since the drum main body 71 inclines several degrees downward toward the discharge port 84, sand S and the casting M move toward the discharge port 84 with the circular motion as shown by the arrow of FIG. Sand removal is performed in this process, and the casting M and sand S from which sand was removed are discharged separately from the discharge port 84.

The vibrating drum 70 of the prior art is constructed as described above and also serves to perform the operation. The sand eliminator of another type of casting, for example, is provided by supplying a casting for removing sand to the bottom surface of the foot shape and linearly vibrating it. The sand is discharged downward and the feet are transported by linear vibration. In the sand remover of this type of casting, the impact on the casting is often hurt by casting, and the posture of the casting is changed (inverted, etc.). There is a drawback that sand does not fall depending on the shape of the casting because there is almost no. However, the above-described vibration drum 70 of the conventional example removes such a drawback. However, a pair of vibration motors 79a and 79b It cannot be said to be synchronized, and when the synchronization is out of order, an irregular vibration is given to the drum body 71, and thus, the same operation as described above cannot be performed. Not only does not allow sufficient sand removal, but also has the same drawbacks as the other types of sand removers described above.

For example, it may cause damage to the casting M. In order to cope, the vibration motors 79a and 79b rotate in synchronism with the attachment position of the vibration motors 79a and 79b to the drum body 71 and the excretion of the spring 74, and the like. Strict setting criteria are needed.

Thus, the vibrating drum 70 shown in FIGS. 10 and 11 becomes expensive and resonates depending on the total weight of the casting M and sand S to be removed in the drum body 71 and the mass distribution thereof. Not only can't get the state, but also it can't perform synchronous rotation.

Another type of sand remover for castings is a so-called rotary drum which rotates the drum at a predetermined speed in a predetermined direction. When sand is removed, it falls to a certain height when the casting is lifted due to a jam. In some cases, you may be injured by this shock.

In addition, since the contact time with the casting is long, the aged or the additive is aged.

In addition, as described above, a drop occurs at a latch or the like periodically, so noise is generated.

This conventional example is excellent in such a difficulty, but still has the point which should be improved as mentioned above.

12 and 13 show other conventional examples, the parts corresponding to the conventional examples are denoted by the same reference numerals and detailed description thereof will be omitted.

That is, in this conventional example, the excitation mechanism 73 for generating the linear vibration force is attached to the circumferential wall portion of the drum main body 71 as a pair of vibration motors 82A and 82B. They are fixed to the mounting table 95, but one end of each of the rotating shafts 83a and 83b has the same diameter and number of gears 89a and 89b fixed thereto, Although small in diameter, the same diameter and number of gears 90a and 90b are attached to the bearing housing 88 'in such a way that the shaft is rotatably driven, and each of the vibration motors 82A and 82B has its own power supply. As the AC power is connected to the cords 85 and 85, they are driven in opposite directions, respectively, which are engaged with the gears 90a and 90b and with the large diameter gears 89a and 89b. The same speed in the direction in which the semi-circular unbalanced weights 84a and 84b fixed to one end of the rotary shafts 83a and 83b are opposed to each other. Rotate synchronously as

This generates a linear vibration force in the X direction as shown in FIG.

The other conventional example is simpler than the conventional example, but has the following drawbacks.

Also in this conventional example, the drum body 71 has a cylindrical shape, and transfers the casting for sand removal according to the axis C of the drum body. The drum body 71 is supported by anti-vibration springs 77a and 77b. Also in this embodiment, an exciter 73 consisting of two vibration motors 82A and 82B is also provided in the peripheral wall portion of the drum body 71.

Also in this conventional example, semicircular unbalanced weights 84a and 84b are fixed to the drive shafts 83a and 83b of the vibration motors 82A and 82B, but one end of the drive shafts 83a and 83b is fixed. The gears of the same type and the same size are fixed to the part, and these mesh with each other, so that the two vibration motors 82A and 82B rotate at the same speed in synchronism with each other in different directions.

This generates a linear vibration force in the direction of arrow P as shown in FIG. 14, which crosses substantially perpendicular to the axis C. As shown in FIG.

Thus, when the casting to be sand-deleted has not yet been put into the drum body 71, that is, when there is no load, each point of the circumferential wall portion of the drum body 71 vibrates linearly as indicated by the arrow. The direction is substantially parallel to the direction of the linear vibration force P, and is substantially equal to the angle α with respect to the horizontal line on which the excitation mechanism 73 is provided.

That is, at no load, the vibration vibrates at a substantially uniform amplitude and vibration angle at each point of the main wall portion of the drum body 71. However, when the casting M to be removed from sand is introduced as shown in the drawing, the arrow R is indicated as in the conventional example. It is thought to perform the same circular motion, but it is greatly reduced than the amplitude at no load.

Therefore, it is difficult to actually perform the circular motion as shown in the figure, and the circulation speed is small in order to make the amplitude small, and the fluidity is inferior to the conventional example.

This means that the casting M to be removed is vibrated together with the drum body 71 in the direction of the vibration direction P at no load, but the vibration direction is indicated as a ₁ at the bottom wall of the drum body 71. Although almost the same as, at the angular position a ₂ of 45 degrees in the counterclockwise direction, since it is almost parallel to the direction of P as mentioned above at no load, this vibration with respect to the inner peripheral wall surface of the drum main body 71 at this point. The angle of is nearly parallel, and therefore, as is evident in the theory of vibration, the acceleration is less than 1 g in the vertical direction of this plane, and no hopping motion, thus no conveying action by vibration.

Moreover, at a greater angular position counterclockwise from this, for example, at point a ₃ , the transfer action by vibration to the inner wall surface of the drum body 71 is anticlockwise to the inner wall surface of the drum body 71. The feed in the direction is preferable, and it becomes clockwise, so that the casting force M in the drum body and the sand S which are released from the drum body are opposed to the feed force that goes counterclockwise at the lowest point a ₁ . The wall is pressed and vibrated as if it were an integral rigid body.

Therefore, the amplitude at each point by the constant exciter 73 naturally becomes small, and thus fluidization is hindered as described above.

Furthermore, in this conventional example, for example, it is driven at 894 rpm with a 60 Hz power source, and 894 rpm belongs to ultra low frequency in the technical field of the so-called vibration, and this causes vibration in the building near the excavation drum by this ultra low frequency. It is in an over-resonant state and shakes a part of a building, such as a window or a door, by shaking it.

Therefore, residents living near the factory that excavates this vibration drum are subject to vibration pollution.

Furthermore, in the conventional example of FIG. 12, since the gears are fixed to one ends of the drive shafts 83a and 83b, they are meshed and rotated. However, even if the meshing is precisely designed, the meshing sound can be zero. It is a high-pitched sound, which is applied to it, which is a noise pollution in the neighborhood.

In light of the above problem, the present applicant has a small difference in amplitude when a load is applied under no load even with the same rotational driving force. Therefore, when a casting material is to be removed, for example, sand is removed. The main wall of the drum body supported on the ground with a vibration-proof spring for the purpose of promoting fluidization of the building, and providing a vibration drum capable of preventing ultra low frequency pollution of nearby buildings and preventing noise pollution. A circular excitation generator which generates a circular excitation force by rotation of an unbalanced center, and a straight line connecting the center of the circular excitation force and the axis of the drum body vertically with a horizontal line makes the angle zero above the axis. A vibrating drum has been proposed, which is attached to make degrees from 90 to 90 degrees. (Japanese Patent Application Laid-Open No. 3-126576)

EMBODIMENT OF THE INVENTION Hereinafter, the vibrating drum by the said proposal is demonstrated with reference to drawings.

4 to 8 show an example of the present proposal, in which the entire vibrating drum is indicated by reference numeral 1, and the exciter 3 of the present invention is provided on one side of the circumferential wall of the drum body 2. .

Moreover, the drum main body 2 is downward in the figure by the anti-vibration springs 6a, 6b, 7a, and 7b disposed on the support posts 4a, 4b, 5a, and 5b. It is inclined a few degrees and is vibrated and supported.

In FIG. 4 of the drum body 2, a supply port 8 is formed at the left end to supply the casting to be sand-depleted, and an outlet 9 for discharging the casting from which the sand is removed is provided at the right end. It is installed.

The drum body 2 is reinforced with ribs 10 at its circumferential wall, and the right end is partially closed by a lid 11 (shown in FIG. 6).

Next, the detail of the exciter 3 is demonstrated with reference to FIG. 5 and FIG. 7 especially.

The exciter 3 according to the present example is a circular oscillator for generating a circular vibration force, and the electric motor 24 is fixed on the mount 23 disposed on the side of the drum body 2, which is a driving source. to be.

A first link 25 coupled to a universal joint mechanism is connected to both ends of the rotating shaft 24a of the electric motor 24. That is, the rotary shaft 24a of the electric motor 24 is coupled to the first link 25 through the universal joint 26a, and the left end thereof is coupled to the first shaft 29 through the universal joint 26b. have.

The first support shaft 29 is fitted to an inner race of a pair of bearings 28a and 28b fixed to both sides of the attachment plate 27 attached to the drum body 2, one end of which is fixed. As shown in Fig. 7, the semi-unbalanced unbalanced weight 30a is fixed to the part, and the unbalanced weight 30b having the same shape as the unbalanced weight 30a is fixed to the other end of the first axis 29.

The first axis 29 is again coupled to the second link 31 and the second axis axis 35 through the universal joint 32a, 32b, which is attached to the circumferential wall of the drum body 2; It is fitted through the inner race of the pair of bearings 34a and 34b provided on both sides of the attachment plate 33, and the unbalanced weights having the same shape as the above-described unbalanced weights 30a and 30b are inserted at both ends thereof. 36a and 36b are fixed.

Further, according to the proposed example, the straight line LL which is perpendicularly coupled to the center of the circular vibration force, that is, the axis C of the driving side 25 and the drum body 2, has an angle β of 25 horizontal lines HH. Is set to.

This angle 25 The height position of the mount 23 described above and the shape of the mounting plate 27 are set so as to maintain the shape.

Moreover, according to this example, the rotational direction of the electric motor 24 driving the drive shaft 25 is driven to rotate clockwise in FIG.

The exciter 3 of this example is constituted as described above, and a pair of inspection windows 21a and 21b are again provided on the upper wall of the drum main body 2, and the drum as shown in FIG. An arc-shaped partition plate 22 is fixed to a part of the inner wall near the outlet 9 of the main body 2.

Although the vibration drum main body 1 by this example is comprised as mentioned above, the operation | movement is demonstrated next.

Although not shown, the casting to be removed from the material supply port (8) is to be put.

When the electric motor 24 is driven, the rotational force of this rotating shaft 24a rotates a pair of unbalanced weights 30a and 30b through the universal joints 26a, 26b and the first link 25, Both ends of the second shaft 35 coupled through the first axis 29, the universal joint 32a, 32b, and the second link 31 which hold the unbalance weights 30a and 30b again. The unbalanced weights 36a and 36b fixed to the shaft are similarly driven to rotate.

The centrifugal force, i.e., circular excitation force, is generated around the axis of rotation of the axis of rotation, that is, the axis 29, 35 by the rotation of the unbalanced weights 30a, 30b, 34a, and 34b. However, the drum body 2 vibrates due to the excitation force as a mode described later.

The rotary shaft 24a of the electric motor 24 is coupled to the unbalanced weights 30a and 30b through the universal joints 26a and 26b, and the first shaft 29 is the universal joint 32a and 32b. Since it is coupled to the unbalanced weights 36a and 36b through, the vibration of the drum main body 2 is hardly transmitted to the electric motor 24 side, and rotational drive can be continued stably.

FIG. 8 shows the relationship between the shaft center C of the drum body 2 and the center G of the whole body and the center P of the cost vibration force of the exciter 3 described above. As a result, a circular excitation force F as shown in FIG. 8 is generated, and a rotation moment is generated around this and the center G, and the drum body 2 is formed as a line according to the distance from the center P of the excitation force F. The vibration mode as shown on the circumference is performed. That is, on the circumferential wall portion of the drum body 2 closest to the exciter ₃ , an elliptic vibration as shown by a ₁ , a ₂ , a ₃ , a ₄ is performed. It is large and its long axis is inclined sequentially from the substantially vertical direction to the counterclockwise direction.

In the bottom wall of the drum body ₂ , linear vibration and elliptic vibration are performed as shown by b ₁ , b ₂ , b _3, and b ₄ , and the direction of its long axis is counterclockwise in a direction tangential to the drum inner wall surface. It is inclined to have a vibrating feed force.

In addition, the elliptical vibration is performed at the point near the top of the vibrating drum body 2 as indicated by d ₁ , d ₂ , d ₃ ---, and the long axis and the short axis are sequentially reduced, and the vibration b described above is performed. ₂ , b ₃ , b ₄ , c ₁ , c ₂ --- are elliptic vibrations that rotate clockwise in FIG.

The vibrations d ₁ , d ₂ , and d ₃ are also oscillations which rotate clockwise as elliptic vibrations, the direction of which is almost parallel to the tangents of the points on the circumferential wall of the drum body 2. The feed force of the material does not rise up to this point, but little.

In FIG. 8, linear movement is performed as shown by the vibration e at the angular position of about 170 degrees as seen from the vibration a ₁ with respect to the axis C in the counterclockwise direction.

At this angular position, the elliptic vibrations f ₁ , f ₂ , f ₃ , and f ₄ , whose long and short axes increase sequentially, are counterclockwise rotations, so that they are linearly vibrated again at the lowest part of the vibrating drum body 2. b is _1, geotinde performing elliptical vibration as the above-described back toward the counter-clockwise direction in this angular position, the rotational direction is the clockwise direction.

The vibration mode described above is a result calculated by a computer when the origin of the X-Y rectangular coordinate is equal to the center C '(axial center C) of the drum cross-section circle, and each dimension is as follows.

The casting M supplied from the supply port 8 of the material is transferred to the right side because it is inclined downward by about 2 to 3 degrees in FIG. 4 while receiving the vibration as described above from the inner wall of the drum body 2. In the middle of the transfer, as shown in FIG. 8, the casting M receives the force rising counterclockwise in FIG. 8 along the inner circumferential wall surface of the drum body 2, and when it rises to a certain level, the gravity side turns on and the casting M moves downward. Sliding and falling along the upper surface of the upper layer of the upper part of the upper part of the circumferential wall, the same movement as shown by the trajectory Q shown in the lifting force is transferred to the right in FIG. It is discharged to the outside from the discharge port (9) by the cooling action, as shown in Figure 6 in the vicinity of the discharge port (9) is provided with an arc-shaped partition plate 22 along the inner circumferential wall surface Since, is receiving sufficiently removed is sand the stirring force as described above can be discharged from the discharge port 9 to the outside.

If there is no partition plate 22 and the filling rate of the casting M to remove the sand to the drum body 2 is small, it will be discharged to the outside from the outlet 9 without receiving sufficient agitation force.

Therefore, the effect of the partition plate 22 shows a big effect when the filling rate of the casting in the drum main body 2 becomes small.

As described above, the casting M to be sand-exposed in the vibration drum body is put into the stirring operation, the vibrations b ₁ , b ₂ , b ₃ , b ₄ , c ₁ , c ₂ --- It shows the state in which the casting M to be removed sand is not injected into the main body 2, that is, the vibration state under no load state. Even in the case of exercise, the difference in amplitude is almost smaller than in the prior art, so that b ₁ , b ₂ , b ₃ ,. … There is almost no change in the vibration mode, and the amplitude is only slightly smaller. Therefore, the casting M receives a conveying force as described later.

At the lowest part of the drum main body 2, a linear vibration b ₁ is performed, in which a straight line of rightward upward is made with respect to the tangent at the point of the main wall surface of the main body 2, and as is known, such a straight line In vibration, it receives a large feed force.

Therefore, the casting M to remove the sand above is subjected to a large feed force, and is transported counterclockwise in the drawing.

Furthermore, in the counterclockwise direction, b ₂ , b ₃ , and b ₄ increase in amplitude on the long and short axes. Since the direction of the long axis has an oscillation angle which receives the conveying force by vibration with respect to the tangential direction at one point of the main wall surface of the drum body, the casting M and the sand S also receive a large conveying force and counterclockwise in these points. It rises under the power of

Again, in c ₁ , c ₂ , and c ₃ , the direction of the long axis has only a slight oscillation angle with respect to the tangent at each point of the main wall surface, so that the feed speed due to the vibration force along that surface is very small. Unlike the conventional example, a slight force is applied to the main wall surface of the drum body 2 in a counterclockwise direction.

And at the lowest rotational position about 90 degrees counterclockwise, it vibrates at a ₁ , in which the long axis is almost parallel to the tangent at one point of the main wall and does not receive any transfer force due to any vibration. .

Further, the vibration a _2, in which angular position proceeds in a counterclockwise direction a _3, a ₄ in the long axis direction of the vibration angle is reverse to the tangent of each point of the main wall, the above-described vibration c _1, c ₂ , c ₃ --- reverses the feed direction. That is, since it is transferred in the clockwise direction, if the casting is conveyed by the vibration force (actually, the gravity falls), the conveying speed due to the vibration of c ₁ , c ₂ , and c ₃ described above is reduced. .

As described above, the casting M to be removed at the filling rate as shown in FIG. 8 receives the stirring force as indicated by arrow Q, and moves to the right in FIG. 4 along the axis C of the vibrating drum body 2. It is transported in three dimensions, and the sand is sufficiently removed while being subjected to a spiral stirring force, and as the moisture from the casting evaporates, the latent heat is taken away, so it is cooled with good efficiency and discharged outward from the outlet of the drum body. .

In this example, the mode of elliptic vibration from the lowest part of the drum body to the position where it rotates 90 degrees counterclockwise is changed as described above. The long axis of the ellipse is the direction in which vibration feed force is applied. In addition, since the rotational direction of the elliptic vibration is clockwise, it receives a larger conveying force, and thus a circulation action with good efficiency.

Furthermore, as described above, according to this example, the vibration at each point of the circumferential wall portion of the vibrating drum body 2 in the no-load state is in a load state, that is, when the casting M to be sand-depleted is supplied. Even in the state of, the amplitude, i.e., the amplitude of the long and short axes of the elliptic vibration, hardly changes, and it may be considered that the vibration force is applied to the casting to which sand is to be removed in the vibration mode as shown in FIG. The smaller the difference in amplitude is, the elliptic vibrations c ₁ , c ₂ , c ₃ , and a ₄ have very small vibration angles on the long axis, but the amplitude in the short axis direction is sufficiently large, and thus receives a large acceleration in this direction. If this is 1G or more, it is natural, but casting M, which is to be removed with better efficiency, receives the stirring force in the drum body, because it receives a jumping force in the vertical direction with respect to the tangent at each point of the inner circumferential wall. In the conventional example of FIG. 12, although the linear vibration force is given to the drum main body 71, linear vibration of the same mode as described above is performed in this circumferential wall part, and at the angular position of 90 degrees counterclockwise from the lowest part. Not only is the oscillation angle small in the direction of conveying the casting, but also at a counterclockwise angular position of about 45 degrees from the lowest part, the oscillation angle of the straight line is reversed, thus giving a force for transferring the casting clockwise in this respect.

Therefore, at the lowest part, the force is applied in a counterclockwise direction, and the casting at this point and the casting at about 45 degrees become a pushing force against each other, and eventually the pressing force against the main wall of the drum body. . Therefore, as described above, the net mass of the drum body vibrates integrally as a rigid body, and this effective mass increases, and even at the same linear vibration force, the amplitude changes significantly at no load and load. do.

Therefore, in order to obtain the vibration as shown in FIG. 12 under load, the magnitude of the linear vibration force must be further increased.

In the present embodiment, however, the amplitude hardly changes, and the driving force can be reduced.

Further, according to this example, when compared with the vibration drum to which the sound level of the ultra low frequency (900 rpm) noise emitted from the vibration drum 1 is applied and the linear vibration force shown in FIG. The result is being obtained.

That is, the relationship between the point at the center of the vibrating drum 1 up to 100 m and the ultra low frequency noise level dB at that point changes as shown in FIG.

Both are decreasing linearly, with the prior art being about 6 dB higher noise. Therefore, in dB units, the effect of ultra-low frequency noise on each building at 100m can be much smaller.

Obviously, as described above, the conventional vibrating drum vibrates linearly, and when viewed as a projection plane from a distance, the amplitude of the linear vibrating is large, thereby causing various damages by ultra-low frequency noise. As shown in Fig. 8, each circumferential wall portion of the vibrating drum body 2 performs an elliptic motion, and since this short axial amplitude becomes a noise source for a point away from this axis center C, it is expected that the noise level will be obviously small. .

This is evident by FIG.

The vibration drum proposed by the present applicant has been described above. However, the present invention has a great effect as described above in comparison with the conventional example, but still has the following difficulties.

That is, in Fig. 15, the above-described vibration drum is schematically shown, but the material inlet E is formed in the left end wall portion of the cylindrical drum body D, and the material outlet H is formed in the right end wall portion.

In Fig. 15, the vibration drum main body D is shown to be very simplified in comparison with the above-described proposal example, and it is thought that the whole center G is located on the axis C-C through this center.

When the vibration drum body D is vibrated by vibrating the vibration drum body D as described above (F acts on the excitation force), vibration in the same mode as described above is performed. The vibrator is attached to have a line of action of force that crosses at approximately right angles.

Again, it is attached so as to pass through almost the center G, and when the casting M to be removed with sand is introduced as described above in the material inlet E, the casting M is cooled by being subjected to the stirring action as shown in FIG. The water is removed and returned to the right side in FIG. 16, where drying is much more advanced in the vicinity of outlet H, compared to just below the inlet E, whereby the circulation velocity of the circulation as shown in FIG. It is large, and therefore the feed speed to the material outlet H becomes large.

As a result, in the vibrating drum body D, the thickness of the layer M of the casting M and the sand Q is large directly below the material inlet E, and on the contrary, the thickness of the layer decreases as indicated by q near the outlet H. Due to this, due to the casting on the material inlet E side and the layer Q made of sand, the difference in amplitude in this portion of the drum body D is large and gradually increases the thickness of the layer. That is a vicious cycle.

The vibrating drum proposed by the applicant has a great effect compared to the conventional example, but still has the same difficulty as described above.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and while providing the effect of the vibration drum proposed by the present applicant, the present invention further provides, for example, a vibration drum which can further increase the processing capacity of sand removal of castings. The purpose.

In the above-described object, in the vibration drum in which the excitation force generator is attached to the circumferential wall portion of the drum main body supported by the spring for vibration prevention so that the direction of action of the excitation force is almost toward the drum body axis, the action point of the excitation force is the drum body. It is achieved by a vibration drum characterized in that the generator is attached so as to be convenient on the material inlet side.

Alternatively, in the vibration drum attached to the main wall of the drum body supported on the ground by the anti-vibration spring so that the direction of action of the excitation force is almost toward the axial center of the drum body, the excitation force generator is a plurality of excitation force generating portion And an excitation force generating portion attached to the material inlet side of the drum body rather than the center of the drum body.

Alternatively, in a vibration drum having a vibration force spring mounted on the circumferential wall of the drum body supported on the ground by the vibration spring so that the direction of action of the vibration force is almost toward the axis of the drum body, the vibration force generator is a plurality of vibration force generators. And the synthetic force of the excitation force generating portion attached to the material inlet side of the drum body rather than the center of the drum body is the excitation force attached to the material outlet side of the drum body than the center of the drum body. It is achieved by a vibration drum characterized by greater than the combined force of the excitation force of the generator.

Since the excitation force exerted on the drum body is larger than the material outlet, the circulation speed of the casting and sand in the drum body can be made larger, and thus, at the material inlet side and the material outlet side in the drum body, The thickness of is more uniform than the vibration drum proposed above, and the amplitude difference in the part of the drum body at the material inlet side is also small, and thus does not cause a vicious cycle. The thickness of the material, for example, the casting and the sand, is almost uniform. It is possible to obtain the moving speed according to fluidization and shaft center.

EMBODIMENT OF THE INVENTION Hereinafter, each Example of this invention is described with reference to drawings.

FIG. 1 is a plan view of a vibration drum according to Embodiment 1 of the present invention, which corresponds to FIG. 5 of the vibration drum proposed by the present applicant, and the same reference numerals are used for parts corresponding to FIG. 5. The detailed description thereof is omitted.

That is, according to the first embodiment of the present invention, the first unbalanced weights 30a and 30b are the same as those in the previously proposed example, but the mass m X center of the unbalanced weights 30a and 30b is the same as that in the above-described example. The unbalanced weights 136a and 136b having a larger distance R from the center of gravity to the rotation axis are fixed to the second support shaft 135 via the second link 131 and the universal joint 132a.

The unbalanced weights 136a and 136b are fixed to the second axis 135 which is larger in strength since m x R is larger than the unbalanced weights 30a and 30b in the previous example.

Therefore, the bearing structures 134a and 134b supporting this second shaft 135 also have a structure that withstands a load larger than the bearing structures 34a and 34b in the example proposed above.

The exciter 130 configured as described above is fixed at the same position as shown in FIG. 6 of the drum body 2 in the same relationship as the above-described proposal, and as in FIG. The center G is located on the axial center CC of the center, and the center G is located at the center of the length of the drum body 2 in the longitudinal direction. However, the unbalanced weight is larger than the center G by biasing the material inlet 8 side. 136a, 136b are fixed to the drum body 2 via the attachment member 133, and unbalanced weights 30a, 30b are smaller than the center G in the side of the outlet port 9, where mx R is smaller. ) Is fixed to the shaft supported by the bearings 28a and 28b.

In this embodiment, the point of action of the excitation force by the second unbalanced weights 136a, 136b at about the same distance from the center G toward the material inlet 8 and the material outlet 9, i.e., the drum of the attachment member 133. The distance to the coupling point with respect to the body 2 and the distance of the coupling point with respect to the drum body 2 of the attachment member 27 for exerting the excitation force of the first unbalanced weights 30a, 30b at the center G. As described above, the first unbalanced weights 30a and 30b in which the excitation force by the unbalanced weights 136a and 136b on the material inlet 8 side are biased to the material outlet side as described above. Is greater than the excitation force.

Embodiment 1 of this invention is comprised as mentioned above, but the effect | action is demonstrated next.

When the motor 24 is driven, circular excitation force is generated by the unbalance weights 30a, 30b, 136a, and 136b as in the above-described proposal, which is related to the axial center CC of the drum body 2. In the vertical section, as shown in FIG. 8, the oscillation of the modes shown in the elliptic vibration modes a ₁ , a ₂ , a ₃ , a ₄ , b ₁ , b ₂ , b ₃ , and The length of this long axis and short axis is the elliptic vibration in FIG. 8 when it is represented in the cross-sectional shape at the working point of the supporting member 133 for exerting the excitation force of the second unbalanced weights 136a, 136b. It is almost the same as the mode of the mode, but the size of the long axis and the short axis becomes larger (at no load).

Therefore, the casting to be removed from the material inlet is subjected to a similar action as in the previous example, but the longer and shorter axis of the elliptic vibration on the material inlet 8 side is larger, such as shown in FIG. The circulation movement of the casting M and the sand S becomes larger than the conventional one, and thus the casting to be removed from the material inlet 8 performs the circulation movement as shown in FIG. 8 at a larger circulation speed than the conventional one.

Immediately after the injection, it contains a lot of water. However, in the proposed example, since the circulation speed is small, it is stagnant and the gap of the amplitude is also reduced, but the circulation speed is increased, thus receiving the drying action more strongly.

Therefore, the casting and sand moisture to be removed in the vicinity of the material inlet is less faster than the prior art, thereby the fluidization state is better than the above-described proposal, the transfer speed toward the material outlet is larger.

As a result, the thickness of the layer of the casting to be removed to the material discharge port becomes substantially the same according to the axis C-C of the drum body 2.

Thus, the throughput of the casting to be removed is greater.

FIG. 2 is a side view of the vibration drum according to the second embodiment of the present invention. Since this configuration is almost the same as the vibration drum shown in FIG. 10 of the conventional example, the corresponding parts will be denoted by the same reference numerals, and detailed description thereof will be omitted.

That is, according to this embodiment, the exciter 73 is fixed to the attachment member 72 ubiquitous on the inlet port 85 side as is apparent from FIG.

It is clear that the same effect as in Example 1 can be obtained also by such a configuration. And, as described in the conventional example, the structure has a drawback that it is more complicated than the above-described proposed example, but according to the axis of the drum body 71, in the past, the casting to be removed in the vicinity of the material inlet 85 The thickness of the layer is much smaller than the layer thickness of the casting to be sand-depleted in the vicinity of the outlet 84, but can be made almost uniform by the present invention, and the processing capacity thereof can be increased.

FIG. 3 shows a side view of the vibration drum according to the third embodiment of the present invention. The vibration drum has three vibration motors M at the positions as shown, with respect to the center G of the entire wall portion of the drum body 2. ₁ , M ₂ and M ₃ are fixed.

Each of the vibration motors M ₁ , M ₂ , and M ₃ has a known structure, but as is apparent from the drawing, the vibration motors are provided on the material inlet 8 side so that their excitation force is ubiquitous.

In other words, the drum body circumferential wall portion on the material inlet 8 side exerts a greater excitation force than that on the circumferential wall portion of the discharge port.

It is clear that such a configuration also exhibits the same effects as in the first embodiment. Since the vibrating motors M ₁ , M ₂ , and M ₃ of the present embodiment are fixed in the same attachment relationship instead of the exciter ₃ in the applicant's previous proposal, this also has the same effect as the previous example. It is obvious to indicate.

As mentioned above, although each Example of this invention was described, of course, this invention is not limited to this, A various deformation | transformation is possible for it according to the technical idea of this invention.

For example, in the above embodiment, the vibrating drum body is inclined several degrees downward in the discharge direction, but this may be horizontal.

In some cases, it may be inclined upward toward the discharge port if it is 1 degree to 0.5 degrees or less.

Or a downhill slope, even at just 0.5 degrees, will give a sufficiently large feedrate.

In the first embodiment, the first link 25 and the second link 31 are connected to the rotary shaft of the motor 24 via the universal joints 26a, 26b, 32a, and 32b, respectively. The unbalanced weights 30a, 30b, 136a, and 136b are fixed to the support shaft and the second support shaft, and the unbalanced weights are coupled to the rotating shaft of the motor 24 supported on the ground as described above. In the configuration described above, for example, referring to FIG. 1 in alignment with the axis of the motor 24, the exciter 130 having the same configuration may be provided on the inlet 8 side. It is clear that such a constitution also has the same effect as the above embodiment. At this time, one of the unbalanced weights 136a and 136b may have the same shape and the same size as the first unbalanced weights 30a and 30b, and only the other unbalanced weight in the present modification is the same shape. It doesn't matter.

Such a structure is apparent to generate a larger excitation force even on the material inlet 8 side, even under load, so that the same effect as in the above embodiment can be obtained.

Incidentally, in the embodiment in FIG. 3, the vibration motors M ₁ , M ₂ , and M ₃ are attached at the same positions as shown, but instead, only two vibration motors are attached, and the material inlet 8 side of the center G is attached. It is also possible to attach a vibrating motor for generating a larger excitation force, and attach a vibrating motor for generating a smaller excitation force on the material discharge port side.

Moreover, in this specification An unbalanced backbone (Unbalanced weight) is not only having a nearly semicircular shape as shown, but may also be of other shapes, and furthermore, by disposing steel spheres in annular bodies of different shapes, for example, circular sections, and introducing compressed air from a part of the tube. This configuration is designed to generate the circular vibration force by rotating the steel sphere at high speed. An unbalanced backbone It shall belong to.

In addition, all known structures that generate centrifugal force by rotation of mass and make it a circular vibration force are all applicable to the present invention.

Alternatively, in the above embodiment, in the direction opposite to the conveying direction according to the axis of the drum body, a circular mechanism is attached to the right above the axis to rotate clockwise, but the rotation direction of the motor driving the rotating shaft is rotated. The castings taken out of the mold upstream from the supply port of the vibrating drum 1 may be preliminarily shaken out, for example, by a shake-out machine and then supplied to the vibrating drum of the present embodiment. If the supply capacity of this shake-out machine is divided into two cases, or if the feed rate of sand to be removed with a single shake-out machine becomes large and small, it should be converted accordingly. In the case of a motor, change the rotational direction of the motor counterclockwise, and when it is large, clockwise It may rock to a sand removal of the seamless continuous casting.

As described above, according to the vibration drum of the present invention, the structure is simpler than in the prior art, and the amplitude difference as a whole is smaller, and the throughput of the material to be removed, such as sand, can be increased.

Claims (7)

In the circumferential wall of the drum body 2 supported on the ground by the anti-vibration springs 76a, 76b, 77a, and 77b, the excitation force generators 3 and 130 have an action direction of the excitation force almost at the center of the drum body 2; In the vibratory drum 70 attached so as to be directed to the side of the drum, the excitation force generators 3 and 130 are attached so that the action point of the excitation force is biased toward the material inlet 8 side of the drum body 2. Vibrating drum, characterized in that. The material input port (8) of the drum body (2) according to claim 1, wherein the excitation force generators (3, 130) are a plurality of excitation force generating portions, and these excitation force generating portions are formed from the center of the drum body (2). Vibration drum, characterized in that attached to the side ubiquitous. 2. The vibration generating apparatus (3) according to claim 1, wherein the excitation force generators (3, 130) serve as a plurality of excitation force generating units, and are attached to the material inlet (8) side of the drum body (2) at the center of the drum body (2). The synthesized force of the excitation force of the excitation force generating portion is greater than the synthesis force of the excitation force generation portion attached to the material discharge port 8 side of the drum body 2 at the center of the drum body (2). Vibration drum made with. The vibration force generator according to any one of claims 1 to 3, wherein the excitation force generators (3, 130) generate a circular excitation force so that the center of the circular excitation force and the axis of the drum body (2) are perpendicular to each other. An oscillating drum, wherein an angle formed by a straight line to be connected with respect to a horizontal line is attached to form an angle of 0 degrees to 90 degrees above the axis. 5. The rotational direction of the excitation force according to claim 4, wherein when the excitation force generators (3, 130) are on the right side of the shaft center in a direction opposite to the conveying direction of the material along the axis of the drum body (2), The rotating drum, characterized in that the clockwise rotation, the counterclockwise rotation when it is on the left side. 5. The vibrating drum according to claim 4, wherein the drum body (2) is supplied with a casting to be sand-depleted as a material. The vibration drum according to any one of claims 1, 2, 3, and 5, wherein the drum body (2) is supplied with a casting to be sand-depleted as a material.