JPH03189067A - Vibrating drum - Google Patents

Abstract

PURPOSE:To strip sand from castings with less noises without damaging the castings within the drum by applying specific vibrations to the drum contg. the castings at the time of stripping the sand from the castings attached with the sand by sand mold casting. CONSTITUTION:The castings M stuck with the molding sand S are put into the vibrating drum 1 supported by posts 4a, 4b, 5a, 5b having vibrationproof springs 6a, 6b, 7a, 7b. A pair of vibration motors 12A, 12B are mounted to the peripheral wall part of a vibrating drum body 2 and revolving shafts 13a, 13b thereof are rotated to rotate gears 19a, 19b fixed at one thereof which in turn rotate small-diameter gears 21a, 21b meshed therewith to synchronously rotate unbalance weights 14a, 14b of the two vibrating motors in the directions opposite from each other, by which the drum body 2 is vibrated in the modes shown by many arrows (a). The casting M in the drum 2 circulates and moves as shown by the arrows and the molding sand S sticking to the castings is separated from the castings M by the vibrating force generated in such a man ner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibrating drum, and particularly to a vibrating drum that is most suitable for use in sanding castings.

[Conventional technology and its problems]

Figures 10 and 11 show a conventional vibrating drum used for sanding castings. ) on the side is the drive unit mounting frame (72
) is fixed to a support base (75) via a resonance drive spring (74), and this support base (75) is fixed to a drum (71) via a plurality of mounting ribs (86). .

In Fig. 1O of the drum (71), a supply port (85) is provided at the left end for supplying the castings to be sanded, and an exhaust port for discharging the sanded castings is provided at the right end. An outlet (84) is formed. Drum (71
) are closed on both sides by end walls (82a) (82b).

The entire drum (71) is equipped with anti-vibration springs (76a) (76b)
(77a) and (77b) are supported on the ground E so that they can vibrate.

A vibration source (73) consisting of a pair of vibration electric motors (79a, f79b) as a drive unit is fixed to the frame (72). The vibrating electric motors (79a) (79b) are configured in a known manner, and their rotating shafts (81a) (81
bl has f semicircular unbalanced weight (80a)
(80bl is fixed, these are reinforced bulkheads (80bl)
Regarding 3), the unbalanced weights (80a) (8ob) are fixed to the frame (72) symmetrically, but the unbalanced weights (80a) (8ob) are fixed to the rotating shafts (81a) (81b) in the same rotational phase. A dust collection duct (7) is installed on the earthen wall of the drum (71).
8) is fixed and communicates with the inner space (gong), so as to guide dust generated by sanding of the casting inside the drum (71) to the outside, as will be described later. Vibrating drum (70)
The whole is inclined several degrees downward toward the outlet (84).

The conventional vibrating drum (70) is constructed as described above, and when the vibrating section (73) is driven, the vibrating motor (
79a) (79b) rotate synchronously,
This is the spring constant of the drive spring (74) and the drum (71)
A pair of vibrating electric motors (79a
l (79b) is rotationally driven. This rotation generates a linear vibration force in the extending direction of the spring (74), which is transmitted to the drum (71) via the spring (74) and the support base (86).
transmitted to. The drum (71) is equipped with an anti-vibration spring (76a)
(76b) (77a) f77b), so it vibrates obliquely in the direction shown by the arrow, thereby causing the casting M in the inner space (evidence) of the drum (71) to vibrate.
And the sand S performs a circular movement as shown by the arrow. Since the drum (71) is inclined several degrees downward toward the discharge port (84), the sand S and the casting M move toward the discharge port (84) with a circular movement as shown by the arrow in FIG. moves. In this process, sanding is performed, and the sanded casting M and sand S are separated and discharged from the discharge port (84).

Although the conventional vibrating drum (70) has the above-described structure and functions, it is also suitable for other types of casting sand scattering machines, such as supplying castings to be sanded onto a slatted floor surface, By making it vibrate in a straight line, the separated sand is ejected downward, and the linear vibration causes it to be transferred over the slats, but this type of casting sand loosening machine applies an impact to the casting, causing damage. (Also, depending on the shape of the casting, there is a drawback that the sand may not fall off because there are not many changes in the posture of the casting (such as reversing).
The conventional vibrating drum described above is designed to eliminate such drawbacks, but it is equipped with a pair of vibrating electric motors (79a) (79b).
) may not always be in sync, and if they are out of sync, the drums (
71), and as a result, it does not perform the above-mentioned action (not only does it not allow sufficient sand removal, but it also has the same drawbacks as the other types of sand removal machines mentioned above). For example, it may damage the casting M. To deal with this, a vibrating electric motor (7
Strict setting standards are required for the mounting position of the vibrating electric motor a [79a) (79b) with respect to the drum (71) and the arrangement of the spring (74) so that the parts 9a) and 79b rotate in synchronization. . Therefore, the vibrating drum (70) shown in Figs. Not only cannot a resonance state be obtained, but also synchronous rotation may not be possible.

Also, as another type of sanding machine for castings, the drum is rotated in a fixed direction at a predetermined speed. There is a so-called rotary drum, but when sanding is carried out using this drum, when the casting gets caught and is lifted up, it goes to a certain height and then falls, which can cause scratches due to the impact. Also, the long contact time with the casting causes the sand to age and the additives to age. In addition, as mentioned above, since falling due to catching or the like occurs periodically, noise is generated. Although this conventional example is superior to these difficulties,
Note that there are points that should be improved as described above.

12 to 15 show other conventional examples of vibrating drums. In the figures, the vibrating drum of this conventional example is indicated as a whole by (90), and the drum (90) is similar to the above-mentioned conventional example.
1) is the pillar (93a) (93b) (93c) (9
Anti-vibration spring on 3dl [98a) (98a) (98b
) (98b) so that it can vibrate and is tilted downward several degrees to the right in the figure. This drum (91
) A vibrating section (92) is disposed on the ground on the side of the vehicle.

The motor (193) serving as this drive source is installed on the ground, and universal joints (95) are installed at both ends of this rotating shaft.
Cardan shaft (94a) through al (95b)
('+4b) is attached, and the unbalanced weight drive shaft (108a) (1θ8b) is connected to the universal dicoints (96a) (96b) at the other end. These unbalanced weight drive shafts (10
8a) Unbalance weight drive units (100A) and (100B) are respectively coupled to t108bl, but since these have the same configuration, only one unbalance weight drive unit (100A) will be described.

In particular, as shown in Figures 14 and 15, the casing (1
02) contains the aforementioned unbalanced weight drive shaft (10
8a) is supported by a bearing fllOb), and this tip is further supported by a bearing [110a). A paired driven rotating shaft (107a) is supported by a bearing (109a) (IQ9b). Semicircular unbalanced weights (105) (106) are fixed to the shafts (107a) (108a), respectively, and gears f103) (104) of the same diameter are fixed to the shafts (107a) (108a), respectively.
) are engaged and fixed to the shaft f107a) (108a). Therefore, the unbalanced weight (1051 (106
1 rotate at the same speed in opposite directions.

The vibrating drum (90) of another conventional example is constructed as described above, but when the motor f193) is driven, the unbalanced weight drive unit (100A) (100BI The balance weights (105) and (106) are rotated at the same speed in opposite directions.This generates a linear vibration force in each unbalance weight drive unit (100A) [100B), which is transmitted to the drum (91). Ru. Therefore, the drum (91) vibrates in the same manner as in the conventional example, and the casting and sand inside the drum (91) are loosened while performing a circulating motion. In Fig. 12, the drum (91) is tilted downward several degrees to the right, so it is gradually transferred to the discharge port (99) while performing a circulation movement, from which the loose castings and separated sand are removed. be discharged.

This conventional example also has advantages over the other types of casting sand breakers mentioned above, but the motor (193)
is a stationary type, and a cardan shaft (94al (94b) is used to connect it to the vibrating drum (91).
), and the structure of the pair of unbalanced weight drive units (100A) (100BI) was also complex, making the overall device cost extremely high.

[Problem that the invention seeks to solve]

The present invention has been made in view of the above problems, and an object of the present invention is to provide a vibrating drum which is superior to other types of casting sand scattering machines, reduces costs, and has a simplified structure.

Means for Solving Problems] The above object is to attach a pair of vibration motors to the peripheral wall of a drum supported on the ground by vibration isolation springs, fix gears to the rotating shafts of the vibration motors, and This is achieved by a vibrating drum characterized in that the rotating shaft of the vibrating motor is forcibly rotated in opposite directions in synchronization by engagement of these gears.

[Operation] When a pair of vibrating electric motors is driven, the vibrating electric motors are forcibly rotated in synchronization by gears that engage with each other. This generates a linear vibratory force that is transmitted to the drum, which is vibrably supported by an anti-vibration spring, so that the drum undergoes a rotational and translational movement about its center of gravity, and the castings and sand within this drum are As in the example, the sand is loosened while performing a circular motion, and if the drum is tilted downward in one direction along its axis, the sand is loosened while being gradually transferred by the action of gravity. , from which the casting and the sand separated from it are discharged.

No matter where the pair of vibrating electric motors are fixed in relation to the center of gravity with respect to the drum, they are forced to be synchronized, so they rotate reliably in synchronization, and therefore can impart desired vibrations to the drum. Furthermore, since the pair of vibrating motors are synchronized by a pair of gears and simply attached to the drum, the structure is simple and the cost can be significantly reduced compared to the conventional example.

[Embodiment 1] Hereinafter, vibrating drums according to embodiments of the present invention will be described with reference to the drawings.

1 to 5 show the first embodiment. In the figures, the vibrating drum is indicated as (1) as a whole, and an excitation source (3) is provided on one side of the peripheral wall of the drum body (2). It is being Also, the drum body (2) is supported by supports (4a) (4b) (5a).
(5b) Anti-vibration springs (6a) placed above (6b)
(7a) and (7b), it is tilted downward several degrees in the figure and is supported so as to be able to vibrate. The first part of the drum body (2)
In the figure, a supply port (8) through which the castings to be sanded are fed is formed at the left end, and a discharge port (9) is provided at the right end to discharge the castings and the sand separated therefrom. It is being A punched metal (2a) is stretched from a certain area inside the drum (2), and the sand separated from the casting falls from this punched metal (2a) into the lower space (98), and is transferred to the punched metal (2a). The casting is discharged from below to the outside, and the casting is discharged from the space above the punched metal (2a) (9A
).

The drum body (2) is reinforced with ribs (10) on its peripheral wall, and its right end is closed with a lid (1).

Next, we will discuss the details of the vibration source (3), especially in Figures 2 to 5.
To explain with reference to the figure, this is a pair of vibrating electric H&
(12A) (12B), and at both ends of these rotating shafts (13al (13bl) are semicircular unbalance weights (14a) (14
a) (14b) (14bl) is fixed. At one end of this gear are gears (19a) (19b) with the same number of teeth and the same diameter.
are fixed, and gears (20a) f20b) with a small diameter and the same number of teeth that engage on the inside thereof are disposed. This is supported by the shaft (21a) (21bl) and fitted into the inner race of the bearing (23a) (23b).
Gears (20a) (20b) are attached to these outer race sides.
) as well as bearings (23
a) The shaft f21a (21b) is fitted and fixed to the inner race of (23b).
Supported as shown in the figure. Further, power cords (15a) (15b) connected to a commercial power source (not shown) are led out from the vibration electric motor (12A) (128). Also, unbalanced weight (14al (1
A cover (16a) (16a) f16b) [+6b) is attached to cover 4al (14b) (14b), and one of the covers (], 6a) [16
b) rotatably penetrates the rotating shaft (13a) f13b)
is inserted. Excitation source configured as above (3)
The whole is fixed on the seat plate (25). Also seat board (25)
is a reinforcing rib (1) fixed to the peripheral wall surface of the drum body (2).
7) Fixed on top. The vibrating drum (1) of this embodiment is constructed as described above, and its operation will be explained next.

Vibration electric motor (12Al (12 old power cord (15a)
) (15b) is connected to an AC power source, the vibration motor (1
The rotating shaft (13a) of 2Al (12B) [13bl rotates, and the gear [19al (19
b) also rotates. A small diameter gear (21al
(21b) also rotates, but since they are meshed and have the same number of teeth and the same diameter, the vibration electric motor m (12Al f12B+ unbalanced weight (14a) (14a) (14b) ( 14
bl rotates synchronously at the same speed in opposite directions. That is, they are driven synchronously by forced synchronization. A linear vibration force is thus generated, which is transmitted to the drum (2). Therefore, it vibrates in the mode shown by multiple arrows a in FIG. The size of the arrow represents the magnitude of the amplitude, and the direction represents the direction of vibration. Due to this so-called eccentric torsional vibration, the casting M in the drum (2) performs a circular motion as shown by the arrow. In addition, the sand S is dropped from the casting by the vibration force. While receiving such a separation effect, the first
The sand S is transferred to the right in the figure, and the sand S is transferred to the punch metal (2
a) and the lower space (
9B) Casting M discharged to the outside from which the sand was separated
is discharged from the upper space (υ) to the outside.

According to this embodiment, the vibration electric motor (12A) f12B) is a gear (19a) (J9b) f20a) (20b)
As the synchronous operation is forcibly performed, the electric motor vibrates at a position offset from the center of gravity as shown in the figure. (12A)
(12B), it is possible to ensure synchronized operation and therefore to stably apply the vibration force shown in FIG. 3 to the drum (2). Therefore, a stable sand separation action can be performed. In addition, the effects that vibrating drums generally have can be achieved as they are. In other words, not only can the sand be removed reliably by the circulation movement of the sand S and the casting M as shown in FIG. prevented,
Moreover, the casting is protected by the sand S and is prevented from being damaged by the impact force exerted by the peripheral wall of the drum (2).

Furthermore, the pair of vibrating electric motors (12A) (1, 2B) are simply coupled with gears for forced synchronization, and because they are simply attached to the drum body (2), the overall vibration source is reduced compared to the conventional example. The structure is simple. Therefore, costs can be significantly reduced.

6 and 7 show a vibrating drum according to a second embodiment of the present invention. In the figures, the vibrating drum of this embodiment is indicated as a whole by (30), and the parts corresponding to the first embodiment are shall be given the same symbol.

The drum body (31) having the same shape as the above embodiment has a support f
34al (34b) (35a) (Vibration proof spring (36a) (36b) (37a) (37b) on 35bl
In FIG. 6, it is tilted downward several degrees to the right and is supported so as to be able to vibrate. A vibration source (38) is attached to one side wall of the drum body (31). This structure is the same as that of the first embodiment, but the mounting direction is different. As is clear from FIG. 7, the vibration electric motor (12^) (12B) rotates parallel to The shafts (13a) and (13b) are arranged so as to extend, as in the first embodiment, but they are connected so that the 52 equal dividing line passes through the axis C of the f-drum body (31). installed.

An opening (3ta) is formed in the end wall (49) that closes the right end opening of the drum body (31), and an opening (31b) is also formed in the end wall (48) adjacent to the supply port (32). These make dust collection easy. As in the first embodiment, castings are taken out from the upper space (outlet) at the discharge port (33), and sand is taken out from the lower space (output). A water supply tube (60) is attached to the earthen wall of the drum body (31), and its opening (61) extends into the space of the body (31).

The second embodiment is constructed as described above, and this embodiment also operates in the same manner as the first embodiment, but it also has the following different effects. In other words, since the linear vibration force ■ generated by the vibration electric motors (12A) [12B) with respect to the axis C of the drum body (31) passes through the main axis C of the drum (31),
In the vibration mode, linear vibration is performed in the direction of the vibration force V as a whole. Therefore, the casting M and the sand S in the drum body (31) perform circulating motion in the state shown in FIG. 7, but at a high speed. When the total weight of the casting M and the sand S increases, the vibration mode becomes the same mode as in the first embodiment, and therefore the circulation motion also becomes the same as in the first embodiment. In addition, especially for light loads, a vibration electric motor (12A) (12
Synchronization force due to vibration acts on Bl, and synchronization can be reliably achieved by forced synchronization due to gear engagement.
The load on these gears can be significantly reduced, and therefore the strength of the gears can be reduced.

FIGS. 8 and 9 show a vibrating drum (
50), but in this embodiment as well, the same reference numerals are given to the parts corresponding to those in the above embodiment. In this embodiment as well, a material supply port (52) is formed at one end of the drum body (51), and a material discharge port (52) is formed at the other end.
53) is formed. Pillar (S4a) (54b)
(55a) (55b) Anti-vibration spring (56a) (
56b) (57a) (S7b) through the material discharge port (
53), and is supported so as to be able to vibrate while being tilted downward by several degrees. An excitation source (
A vibrating motor (12
A) (12Bl's rotating shafts (13a) (13b) are installed so as to extend in the direction f perpendicular to the axis C' of the drum body (51).
The linear vibration force V' generated by l (12Bl) is installed so as to pass through the axis C° of the f drum body (51).Therefore, similar to the second embodiment, the synchronization due to vibration is greater than that of the first embodiment. The vibrating force acts, and therefore the vibration electric motor (12^
) (12B) can be made smaller in strength. Other functions and effects are the same as in the above embodiment.

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

For example, in each of the above embodiments, a pair of vibration electric motors +12A)
(12B) was installed offset to one side wall of the drum, but it may be installed on the earthen wall of the drum, that is, directly above the axis. In this case, the center of gravity of the drum may be largely shifted, that is, the drum may be mounted offset toward the supply port or discharge port. Even in such a case, the desired vibration can be obtained because the gears are forcibly synchronized.

[Effects of the Invention] As described above, the vibrating drum of the present invention does not damage castings, generates little dust, makes little noise, and is easy to maintain, just like conventional drums of this type. It has various effects such as the sand does not age and the additives do not age, but it also has a simple structure and can reliably provide the desired vibration effect.

[Brief explanation of drawings]

FIG. 1 is a side view of a vibrating drum according to a first embodiment of the present invention, FIG. 2 is a partially cutaway view of the same, FIG. 3 is a cross-sectional view taken along the line m-III in FIG. 1, and FIG. FIG. 5 is an enlarged sectional view along the line V-V in FIG. 4, FIG. 6 is a side view of the vibrating drum according to the second embodiment of the present invention, and FIG. 8 is a side view of the vibrating drum according to the third embodiment of the present invention, FIG. 9 is a sectional view taken along the line ■-■ in FIG. 8, and FIG. 10 is a conventional example. 11 is a side view of the vibrating drum of
12 is a side view of another conventional example of the vibrating drum, FIG. 13 is a front view in the direction of the horizontal line in FIG. An enlarged cross-sectional view of the main parts and FIG. 15 is an enlarged cross-sectional view along the line WW in FIG. 14. In the figure, l)・・・・・・・・・・・・・・・ 3)・・・・・・・・・・・・・・・ 12Al (12Bl ・・・・・・・・・19a ) (
19b) ---------・20a) (20b)...
・・・・・・ 30)・・・・・・・・・－・・・・・・ 38) ・・・・・・・・・・・・・・・50)・・・・
・・・・・・・・・− 58)・・・・・・・・・・・・・・・ Vibrating drum excitation source Vibrating electric motor gear Gear Vibrating drum excitation source Vibrating drum excitation source Fig. 4 1 Fig. 5, 9 1B Fig. 7 38 Excitation source Fig. 9 2 Edict...Excitation source Fig. 11

Claims (1)

[Claims] A pair of vibrating electric motors is attached to the peripheral wall of a drum supported on the ground by vibration-proof springs, gears are fixed to the rotating shafts of the vibrating electric motors, and the rotating shafts of the vibrating motors are forcibly rotated by engagement of these gears. A vibrating drum characterized in that the drum is rotated synchronously in opposite directions.