WO2011104815A1

WO2011104815A1 - Object vibration device, mold for secondary concrete products, and method for vibrating objects and vibrating feeders

Info

Publication number: WO2011104815A1
Application number: PCT/JP2010/052743
Authority: WO
Inventors: 幸二岸
Original assignee: トヨタ工機株式会社
Priority date: 2010-02-23
Filing date: 2010-02-23
Publication date: 2011-09-01
Also published as: JP5175999B2; JPWO2011104815A1

Abstract

Provided is an object vibration device that has a wide variety of applications and can produce a large vibration force using a small amount of vibration energy. Said vibration device has: a beam which has attachment sections, at two points along the length of the beam, for attaching to an object to be vibrated; and a vibrator affixed to a different part of the beam, in terms of the long direction thereof, from the attachment sections. The vibrator can vibrate at the characteristic frequency of the beam in the vibration device. When the vibrator runs at the characteristic frequency of the beam, the beam vibrates a large amount. The masses of the vibrator and the beam, which are undergoing vibrational acceleration, produce a vibrational force which acts on the target object, thereby vibrating the target object with a very large force.

Description

Excitation device for article, formwork for concrete secondary product, vibration feeder, and method for exciting article

The present invention relates to a vibration apparatus and a vibration method that can efficiently vibrate articles such as a mold for forming a concrete secondary product and a conveyance path of a vibration feeder with less vibration energy, and the vibration apparatus. The present invention relates to a formwork for a concrete secondary product and a vibration feeder.

A vibration device that uses a spring resonance to obtain a high output with a small amount of vibration energy is described, for example, in Patent Document 1 below.
This is a cylindrical holder with a piston as a vibrator sandwiched between both sides by a coil spring. The piston is vibrated with compressed air, and the coil spring resonates. Since it vibrates, the article can be vibrated with high efficiency by attaching the holder to the article to be vibrated.

Patent Document 2 below discloses a method and apparatus for controlling a concrete vibrator.
A vibrator is attached to a mold for forming a concrete secondary product, and the mold is vibrated when the concrete is filled in the mold. This is to increase the fluidity of the concrete so that the concrete spreads to every corner of the formwork and expels air bubbles from the concrete to obtain a concrete product with a solid and smooth surface.
The vibrator is used by being attached to the outer surface of a mold plate (a plate that directly contacts the partitioning concrete with the cavity) or its reinforcing material.
When the formwork resonates with the vibration of the vibrator, the following problems may occur.
(1) The desired vibration cannot be obtained and the concrete placement and compaction efficiency decreases.
(2) Noise increases and the work environment deteriorates.
(3) The life of the mold is shortened by the resonance of the mold.
(4) It is necessary to increase the strength of the mold due to the resonance of the mold, which increases the cost of the reinforcing material.
Patent Document 2 discloses a technique for adjusting the vibration frequency of the vibrator so as to automatically avoid the resonance of the formwork by raising the problems (1) to (3).
Thus, in the vibrator for the mold for concrete secondary products, the resonance of the mold was a taboo.

FIG. 16 is an explanatory view of a typical vibration motor type vibrator used for a concrete secondary product form, showing a front view of a motor rotating shaft with an eccentric weight on the right side and a side view on the left side.
Eccentric weights 32 are fixed near both ends of the motor rotating shaft 31. The eccentric weight 32 includes a fan-shaped fixed weight 32a and a fan-shaped adjustment weight 32b attached to the fan-shaped fixed weight 32a. Adjustment is possible by fixing the adjustment weight 32b.
The centrifugal force (vibration force) generated by the vibration motor is determined by the mass of the weight, the position of the center of gravity, and the rotation speed. The center of gravity of the weight is located farthest from the axis when the fixed weight 32a and the adjustment weight 32b are completely overlapped, and the centrifugal force becomes the largest, and the amount of overlap between the fixed weight 32a and the adjustment weight 32b decreases. The center of gravity of the weight is close to the axis and the centrifugal force is reduced. That is, the centrifugal force generated by adjusting the overlapping degree of the fixed weight 32a and the adjustment weight 32b can be adjusted.
The vibration motor can change the number of rotations of the motor (the number of rotations per second = the number of vibrations of the vibrator) in a range of about 50 to 120 Hz. By making the motor rotate faster, the frequency increases and the centrifugal force also increases.

Patent Document 3 below discloses a technique for preventing adverse effects caused by resonance of a vibration feeder.
As shown in this document, resonance also causes fatigue failure and noise in the vibration feeder. Although a vibration feeder using the resonance of the transport path has been developed, the condition is that the mass of the transported object is constant, and the eigenvalue changes when the transported substance amount changes. Although the resonance control can be achieved by changing the frequency, the eigenvalue becomes lower when it becomes heavier than twice, so the excitation frequency for resonance must be lowered, and as a result, the input centrifugal force is halved. However, since the conveyance capability is lowered, it cannot be practically used in the case where the mass variation is large when the resonance is used.

JP 2005-169292 A JP 7-39813 A JP 2008-222422 A

Since the vibration device of Patent Document 1 reciprocates the piston in the cylindrical holder with compressed air, the vibration generator becomes large and expensive, and there is a limit to the frequency that can be generated. Application range is narrow. In addition, since the resonance of the coil spring is used, there is a problem that a large vibration force cannot be expected.

In the concrete secondary product formwork and the vibration feeder, it is necessary to vibrate at a high frequency (for example, about 50 to 120 Hz), and therefore the vibration device of Patent Document 1 cannot be used at all.
In addition, as described above, the mold for concrete secondary products is used with the vibrator attached to the outer surface of the sill plate of the mold or the reinforcing material thereof, so that local stress is generated in the vibrator attachment portion of the mold. There is a problem that it is necessary to increase the strength of the formwork, which increases the cost of the reinforcing material and the like, and the dam plate of the vibrator mounting portion vibrates excessively, and bubbles are likely to be generated on the concrete surface of that portion.
Furthermore, since the vibration applied to the mold is localized, there is a problem that a large number of vibrators must be attached in the case of a large concrete secondary product, which increases the cost.

The present invention develops a vibration apparatus for an article having a simple structure, low manufacturing cost, capable of obtaining a large vibration force with a small vibration energy, and capable of vibrating at a high frequency and having a wide application range. Is an issue.

The present invention is a vibratory apparatus having a beam having attachment portions to a vibrating article at two positions in the length direction and a vibrator fixed at a position different from the attachment portion in the length direction of the beam. The vibrator according to claim 1, wherein the vibrator can vibrate with the eigenvalue of the beam in the vibrator. (Claim 1)

Since the vibrator can vibrate at the eigenvalue of the beam in the vibrating device (the natural frequency of the beam with the vibrating device attached to the article to be vibrated), the vibrator is operated at the eigenvalue or a frequency in the vicinity thereof. The beam vibrates greatly, and the vibrator and the mass of the beam generating the acceleration act as vibration forces other than the centrifugal force generated by the rotation of the eccentric weight and act on the article to be excited. Therefore, the article to be vibrated can be vibrated with a very large force.

As the vibrator, a commercially available vibration motor type can be used. Thereby, a high frequency up to about 120 Hz can be generated.
The eigenvalue of the beam in the vibration device is the beam length, the distance between the mounting parts (L), the Young's modulus (E) of the beam material, the secondary moment (I), the cross-sectional area (A), the density (ρ), and the vibrator. Since an approximate value can be calculated from the mass and weight (weight fixed to the beam in order to increase the vibration force), it can be designed to have a desired eigenvalue.
Incidentally, assuming that the beam is a simple beam supported at both ends, the eigenvalue (primary frequency) f of the beam is
f = (π / 2L ² ) (EI / ρA) ^1/2
This is an approximate value of the eigenvalue of the beam in the vibration exciter. When considering the mass of the vibrator or weight, it can be obtained by FEM (Finite Element Method) or the like. Moreover, it can also obtain | require by experiment as mentioned later.
In general, the smaller the vibration device (the shorter the beam length), the larger the eigenvalue. However, even with a large vibration device that can be used in a large formwork for a secondary product, the eigenvalue of the beam is 50 to 50%. Since it can be set to about 80 Hz, it can be operated at a frequency required for the vibration of the concrete formwork or feeder.

[Experiment 1]
Experiments were conducted to verify the effects of the present invention.
First, as shown in FIG. 17, a base 8 (thick iron plate) is firmly fixed to the iron floor 9 by welding, and a vibrator 3 (commercially available vibration motor type: output 750 W) is attached to the top center of the base 8 with four bolts 6. Fixed with. Thereby, the vibrator 3 is fixed to the floor 9 via the base 8 and the bolt 6. A strain gauge 7 was attached to the four bolts 6.

In this state, the vibrator 3 was operated while changing the frequency from 50 Hz to 120 Hz, and the strain generated in the bolt 6 was measured by the strain gauge 7. When the vibrator 3 is operated, a force that causes the vibrator to move upward or downward due to the centrifugal force of the weight in the vibrator is generated, whereby a tensile force or a compressive force acts on the bolt 6. When this centrifugal force was calculated from the measured value of the strain gauge 7, it almost coincided with the centrifugal force described in the vibrator catalog. Incidentally, the centrifugal force at a frequency of 74 Hz was 3027N.

[Experiment 2]
Next, as shown in FIG. 18, the beam 1 and the vibrator 3 were installed on the iron floor 9. The beam 1 is formed by integrating four metal squares of 50 mm × 100 mm × 1150 mm in a horizontal direction, and mounting portions 2 (iron plates) are fixed by welding at four corners in advance, and the lower end of the mounting portion 2 is attached to the iron floor 9. It fixed on the iron floor 9 by welding. The vibrator 3 is the same as [Experiment 1], and is similarly fixed to the base 8 with bolts 6. This was installed in the center of the beam 1 and the base 8 was fixed to the upper surface of the beam 1 by welding. An acceleration sensor 10 is installed at the center of the upper surface of the pedestal 8 (just below the center of the vibrator).
Thereby, the beam 1 is substantially a beam with both ends simply supported by the floor 9.

In this state, the vibrator 3 was operated while changing the frequency, and the acceleration at the center of the beam 1 was measured by the acceleration sensor 10. The beam 1 is deflected and vibrated by the centrifugal force of the weight in the vibrator.
FIG. 19 shows the result of measuring the acceleration at the center of the beam 1. The acceleration is maximum at M in the figure, and the vibration frequency of the vibrator at this time is the eigenvalue of the beam 1. The frequency (natural frequency) at this time was 74 Hz, and the maximum acceleration was 287 m / s ² .
From this result, based on the force equation (F = ma), the force generated at the frequency of 74 Hz (that is, the force acting on the floor 9) was found to be 46299N.

[Comparison between Experiment 1 and Experiment 2]
[Experiment 1] corresponds to a state in which the vibrator is directly attached to the article to be vibrated (iron floor), and the force acting on the article to be vibrated (floor) is 3027N.
[Experiment 2] corresponds to a state in which the vibration exciter of the present invention is attached to the article to be vibrated (floor). At this time, the force acting on the article to be vibrated (iron floor) is 46299 N, [Experiment 1 ] Is about 15 times that in the case of].
Thus, this invention can make the vibration energy of a vibrator act on a to-be-excited article efficiently.

The present invention resonates the vibration of the vibrator with the beam, but does not resonate the object to be excited, so that it is easy to avoid resonance of the object to be excited. That is, the eigenvalue of the beam in the excitation device may be designed to be different from the eigenvalue of the object to be excited.

Also, the present invention is the vibration device according to claim 1, wherein the mounting portion is in a symmetrical position with respect to the center in the beam length direction, and the vibrator is fixed at the center in the beam length direction. (Claim 2)

It is most efficient to provide the vibrator at the center in the longitudinal direction of the beam.
It is preferable that the attachment portion, which is a portion attached to the article to be vibrated, is positioned symmetrically with respect to the center in the beam length direction.
The attachment part may be any part that can be attached to the article to be excited by any method such as welding or bolting, but the beam should not be able to vibrate with the attachment part as a fulcrum while attached to the article to be excited. Don't be.
That is, the attachment portion is preferably a connecting member that does not prevent the bow of the beam from being deformed and transmits only the vertical force to the article to be vibrated, and the member separates the vibration characteristics of the mold and the vibration apparatus of the beam. be able to. By separating, even if the mass of the article to be excited such as a mold is changed, the eigenvalue fluctuation of the beam can be reduced, and the excitation force can be maintained without lowering the resonance frequency. Specifically, a plate-like connection is desirable.

The upper part of FIG. 20 shows a state in which the vibration device of the present invention is attached to the mold 4 that is an object to be vibrated, and the lower part shows a state in which the vibration device is vibrated. The mounting portion 2 of the vibration device is plate-shaped (H-shaped steel web), and its plate surface is parallel to the vibration direction (arrow direction) by the vibration device and is perpendicular to the beam 1.
When the vibration exciter is operated, the beam 1 is bent and deformed like a bow as indicated by the solid line and the broken line in the lower part of the figure, but the beam 1 vibrates without being hindered by deformation because the mounting portion 2 is plate-shaped. To do.
In the present invention, the vibration direction of the vibration device is perpendicular to the beam and perpendicular to the rotational axis (motor shaft) of the eccentric weight of the vibrator.

Further, in the present invention, the vibrator is fixed to the outer side in the beam length direction of the mounting portions, and the vibrator and the mounting portion are located symmetrically with respect to the center in the beam length direction. This is a vibration device. (Claim 3)

If the vibrator cannot be provided at the center of the beam due to the vibration-excited article, it can be provided on the outer side (near the end) of each attachment portion of the beam. Therefore, the number of vibrators is plural. In this case, it is preferable that the vibrator and the attachment portion are symmetric with respect to the center in the beam length direction.

Further, the present invention is the vibration device according to claim 2, wherein a weight is fixed at the center of the beam. (Claim 4)

Further, the present invention is the vibration device according to claim 3, wherein weights are fixed to both ends of the beam. (Claim 5)

By providing a weight on the beam, it is possible to amplify the vibration force acting on the article to be excited.
The weight may be a metal plate, a metal lump, a steel material, or the like having a certain weight.

The present invention is the vibration device according to any one of claims 1 to 5, wherein the vibrator is capable of changing a vibration frequency. (Claim 6)

By changing the frequency, the vibration frequency of the vibrator can be easily adjusted to the eigenvalue of the beam.
Since a commercially available normal vibration motor type vibrator can change the frequency, it can be used.

Further, the present invention is a mold for molding a concrete secondary product to which any of the vibration exciters described in 1 to 6 above is attached, wherein the beam resonates with vibration of the vibrator. It is a formwork for a concrete secondary product. (Claim 7)

Since the vibration generator of the present invention generates a very large vibration force, by attaching it to the formwork, the formwork is vibrated as a whole, not locally, and the flow of the entire concrete filled in the formwork Therefore, it is possible to form a high-quality concrete secondary product while preventing the generation of bubbles.
In addition, since the vibration device of the present invention efficiently generates a vibration force, a vibrator having a smaller size (smaller output) than that of the conventional vibrator can be used, and costs such as energy costs can be reduced.
The vibration device can be attached to any position such as the bottom of the mold, the side plate or its reinforcing material, but it is most preferable to attach the vibration device to the bottom as described later.

The present invention is the mold according to claim 7, wherein the vibration exciter is fixed to the bottom of the mold. (Claim 8)

¡The bottom of the formwork is made with a strong combination of steel such as H-section steel to support the weight of the formwork body and the concrete to be filled. By attaching the vibration exciter of the present invention to the bottom of the mold, it is possible to vibrate the entire mold, not locally, with a large vibration force of the exciter. As a result, it is possible to suppress the generation of air bubbles that have been easily generated locally, and to manufacture a high-quality concrete product. In addition, it is possible to reduce cost by reducing mold materials such as slats and reinforcing materials that have been subjected to local force by a conventional vibrator.

In addition, the present invention is a vibration feeder in which any of the vibration exciters described in the above 1 to 6 is attached to a conveyance path, wherein the beam resonates with the vibration of the vibrator. is there. (Claim 9)

The present invention is the vibration feeder according to claim 9, wherein the vibration exciter is fixed to a lower surface of the conveyance path. (Claim 10)

According to the present invention, the vibration device according to claim 6 is attached to an article, and the article is vibrated by adjusting the vibration frequency of the vibrator based on the relationship between the frequency near the eigenvalue of the vibration apparatus and the beam acceleration. This is a method for exciting an article. (Claim 11)

According to another aspect of the present invention, the vibration device according to claim 6 is attached to a mold, and the vibration frequency of the vibrator is adjusted based on the relationship between the frequency near the eigenvalue of the vibration device and the beam acceleration, and the mold is It is a method for exciting a formwork for a concrete secondary product characterized by being vibrated. (Claim 12)

According to the present invention, the vibration device according to claim 6 is attached to the conveyance path of the vibration feeder, and the vibration frequency of the vibrator is adjusted based on the relationship between the vibration frequency near the eigenvalue of the vibration device and the beam acceleration. A method of exciting a vibration feeder, wherein the conveying path is vibrated. (Claim 13)

Referring to FIG. 19, the acceleration (that is, the vibration force) of the beam becomes maximum at M (the eigenvalue of the beam). For example, in the region S in the figure, there is a certain relationship between the acceleration and the vibration frequency. By utilizing this relationship, a desired vibration force can be obtained by adjusting the vibration frequency.
The desired vibration force can be adjusted by adjusting the overlapping state of the fixed weight 32a and the adjustment weight 32b of the vibrator (FIG. 1), but this operation is troublesome because the vibrator is disassembled. According to this method, the vibration force can be easily changed and fine adjustment can be performed.

The vibration device and the vibration method of the present invention have a simple structure and a low manufacturing cost, and a large vibration force is obtained with a small vibration energy, so that the energy cost can be reduced. Moreover, it can be vibrated at a high frequency and has a wide application range.
The concrete secondary product formwork of the present invention can vibrate the formwork as a whole rather than locally, increasing the fluidity of the entire concrete filled in the formwork and preventing the generation of bubbles. It becomes possible to form a quality concrete secondary product.
Since the vibration feeder of the present invention can vibrate the entire conveyance path with a small amount of vibration energy, the article can be efficiently conveyed.

It is a front view of the vibration apparatus A. FIG. 3 is a side view of the vibration device A. It is a front view of the formwork which attached vibration apparatus A. It is a front view of the vibration apparatus B. 4 is a side view of the vibration device B. FIG. 2 is a perspective view of a vibration device C. FIG. 3 is a perspective view of a vibration device D. FIG. 2 is a plan view of a vibration device D. FIG. It is a front view of the formwork which attached vibration apparatus D. 3 is a perspective view of a vibration device E. FIG. It is a front view of the formwork which attached vibration apparatus E. It is a schematic side view of the mold with the vibration device E attached. It is a schematic sectional drawing of the formwork to which the vibration apparatus B was attached. It is a schematic side view of the vibration feeder to which the vibration apparatus A is attached. FIG. 15 is a schematic rear view of the vibration feeder of FIG. 14. It is explanatory drawing of the motor shaft of a vibration motor type vibrator. It is explanatory drawing of the performance confirmation experiment [Experiment 1] of a vibrator. It is explanatory drawing of the performance confirmation experiment [Experiment 2] of the vibration apparatus of this invention. It is explanatory drawing of the relationship between the vibrator frequency and beam acceleration in [Experiment 2]. It is explanatory drawing of a vibration of an attaching part and a beam.

1 to 3, the vibration motor type vibrator 3 is fixed to the lower surface of the center of the beam 1 of the H-shaped steel with bolts (not shown), and the mounting portions 2 of the small H-shaped steel are fixed to the upper surfaces of both ends by welding. It is a thing.

FIG. 3 shows an example in which the vibration exciter A is attached to the bottom of the concrete secondary product form 4. The mold 4 includes a cavity portion 4a for filling concrete, a bottom portion 4b for supporting the cavity portion, and a leg portion 4c.
The attachment portion 2 is attached and fixed to the shape steel constituting the bottom portion 4b of the mold by any means such as welding. The beam 1 has a shape suspended from the bottom 4b so as to be deformed like a bow.
The motor shaft of the vibrator 3 is oriented in the horizontal direction, and when the vibrator is operated, the beam vibrates in a vertical plane (perpendicular to the motor shaft), and this vibration is transmitted to the mold and vibrates the entire mold. It is desirable to provide an anti-vibration rubber 4d between the leg 4c and the ground.

4 and 5, a vibration motor type vibrator 3 is fixed to the lower surfaces of both ends of an H-shaped steel beam 1 with bolts (not shown), and small H-shaped at two locations on the inner upper surface thereof. The steel mounting portion 2 is fixed by welding. Therefore, the vibrator 3 is fixed to the outer side in the beam length direction of the mounting

portions

2 and 2, and the

vibrators

3 and 3 and the mounting

portions

2 and 2 are in symmetrical positions with respect to the center in the beam length direction.
When the two vibrators are operated at the same rotational speed, the rotation of the eccentric weight of each vibrator is automatically synchronized by the vibration of the beam, and the beam resonates with the vibration of the synchronized vibrator.

The vibration device C in FIG. 6 includes two beam members 1a (H-shaped steel) in which the beams 1 are parallel and a connecting member 1b (a combination of H-shaped steel and an iron plate) that connects the centers thereof. A small H-shaped steel mounting portion 2 is welded and fixed to the upper surface in the vicinity of both ends of each beam member 1a, and a vibration motor type vibrator 3 is fixed to the outer surface of the central portion of each beam member 1a with a bolt (not shown).
In this vibration exciter, the vibrator 3 is arranged at the center of the beam (beam member 1a), and the connecting member 1b acts as a weight, so that a very large vibration force is expressed.

The vibration device D shown in FIGS. 7 to 9 is suitable for use in a large formwork. The beam 1 has two beam members 1a (H-shaped steel) opposed to each other and is welded and integrated into a quadrilateral shape with two connecting members 1b (H-shaped steel). Two attachment portions 2 and 2 'are welded and fixed to the upper surface of each

beam member

1a and 1a, and a total of four vibration motor type vibrators 3 are fixed to bolts (not shown) on the side surface of the outer beam member. ing. Further, metal weights 5 are fixed to both ends of the outer beam member by welding. The

attachment portions

2 and 2 are at the same position with respect to the length direction of the beam, and the attachment portions 2 ′ and 2 ′ are the same. The vibrators and the mounting portions 2 and 2 'are in symmetrical positions with respect to the center in the beam length direction.
When the four vibrators are operated, the rotation of the eccentric weight of each vibrator is automatically synchronized by the vibration of the beam, and the beam resonates with the vibration of the synchronized vibrator.

FIG. 9 shows an example in which the vibration exciter D is attached to the bottom of the mold 4 for molding a concrete secondary product (segment). The mold 4 includes a cavity portion 4a for filling concrete, a bottom portion 4b for supporting the cavity portion, and a leg portion 4c.
The attachment portion 2 is attached and fixed to the H-section steel constituting the bottom portion 4b of the mold by any means such as welding. The beam 1 has a shape suspended from the bottom 4b so as to be deformed like a bow.
The motor shaft of the vibrator 3 is oriented in the horizontal direction, and when the vibrator is operated, the beam vibrates in a vertical plane (perpendicular to the motor shaft), and this vibration is transmitted to the mold and vibrates the entire mold.

10 to 12, the beam 1 has two beam members (metal square members) opposed to each other, and both ends thereof are welded and integrated into a quadrilateral shape with two connecting members (iron plates). It is. A metal weight 5 is fixed to the central portion of the

beam members

1 a and 1 a, and the vibration motor type vibrator 3 is fixed to the weight 5. A total of four

attachment portions

2, 2, 2 ', 2' are fixed to both ends of the beam 1 by welding. The

attachment portions

2 and 2 are at the same position in the beam length direction, and the attachment portions 2 'and 2' are the same. The attachment portions 2 and 2 'are in symmetrical positions with respect to the center in the beam length direction.

11 and 12 show an example in which the vibration exciter E is attached to a mold 4 for molding a concrete secondary product (fume pipe). In the vibration exciter E, the mounting portions 2 and 2 'are fixed to a donut-shaped end plate 4f that closes both ends of the cavity portion 4a of the mold 4 by bolts (not shown), and the beam member 1a can be deformed as a bow. It has become.
The motor shaft of the vibrator 3 is oriented in the vertical direction, and when the vibrator is operated, the beam vibrates in a horizontal plane (perpendicular to the motor shaft), and this vibration is transmitted to the mold and vibrates the entire mold.

FIG. 13 shows an example in which the vibration exciter D is attached to the bottom of the mold 4 for forming the sulfur concrete secondary product. The mold 4 includes a cavity portion 4a filled with sulfur concrete, a bottom portion 4b that supports the cavity portion, and a leg portion 4c. Anti-vibration rubber 4d is provided between the leg 4c and the ground. Moreover, the gate 4e for pouring high temperature sulfur concrete is provided.
The cavity portion 4a is inclined and installed so that the sulfur concrete poured from the gate 4e spreads throughout the cavity.
The sulfur concrete poured from the gate 4e comes into contact with the mold and is cured. Since sulfur concrete has a large shrinkage ratio when cured, it is desirable to vibrate the mold in the axial direction of the cavity so that no voids are formed in the cured sulfur concrete.
In the present embodiment, since the vibration exciter D is attached to the lower portion of the inclined bottom portion 4b with the same inclination, the excitation direction is the axial direction of the cavity as shown by the arrows in FIG.
Thus, the vibration exciter of the present invention can vibrate the article to be vibrated in a desired direction.

14 and 15 show an example in which the vibration exciter A is attached to the lower surface of the conveyance path 11 a of the vibration feeder 11.
The vibration feeder 11 supports a conveyance path 11 a obtained by processing a steel plate into a bowl shape in an inclined state with a support member (not shown), conveys the concrete discharged from the hopper 12, and supplies it into the mold 4. Is.
On the lower surface of the transport path 11a, a steel material is processed, and a lower surface reinforcing portion 11b having a triangular side surface shape is fixed. The vibration device A is attached to the lower surface reinforcing portion 11b.
Thereby, the conveyance path 11a of the vibration feeder 11 is vibrated in the horizontal direction, and the concrete discharged from the hopper 12 is conveyed in the conveyance path 11a and flows into the mold 4.

The vibration exciter of the present invention is not limited to the concrete secondary product formwork and the conveying path of the vibration feeder, and can be used to vibrate various articles.

DESCRIPTION OF SYMBOLS 1 Beam

1a Beam member

1b Connecting material 2 Attachment part 2 'Attachment part 3 Vibrator 4 Formwork

4a Cavity part

4b Bottom part

4c Leg part

4d Anti-vibration rubber 4e Sprue 4f End plate 5 Weight 6 Bolt 7 Strain gauge 8 Base 10 Acceleration base 9 Sensor 11 Vibrating feeder 11a Conveying path 11b Lower surface reinforcing portion 12 Hopper 31 Rotating shaft 32 Eccentric weight 32a Fixed weight 32b Adjusting weight 32c Adjusting hole A Exciting device B Exciting device C Exciting device D Exciting device E Exciting device

Claims

A beam having attachment portions to the article to be vibrated at two positions in the length direction;
A vibration device having a vibrator fixed at a position different from the mounting portion in the length direction of the beam,
A vibrator for an article, wherein the vibrator can vibrate with the eigenvalue of the beam in the vibrator.
2. The vibration device according to claim 1, wherein the attachment portion is in a symmetrical position with respect to the center in the beam length direction, and the vibrator is fixed at the center in the beam length direction.
The vibrator is fixed to the outside of each attachment portion in the beam length direction,
2. The vibration device according to claim 1, wherein each of the vibrators and the attachment portion is in a symmetrical position with respect to the center in the beam length direction.
The vibration device according to claim 2, wherein a weight is fixed at a center of the beam.
The vibration device according to claim 3, wherein weights are fixed to both ends of the beam.
The vibration device according to any one of claims 1 to 5, wherein the vibrator is capable of changing a vibration frequency.
A formwork for molding a concrete secondary product to which any of the vibration exciters described in 1 to 6 above is attached, wherein the beam resonates with the vibration of the vibrator. Formwork for.
The formwork of Claim 7 which fixed the said vibration exciting apparatus to the bottom part of the formwork.
7. A vibration feeder having the vibration device according to any one of 1 to 6 attached to a conveyance path, wherein the beam resonates with vibration of the vibrator.
The vibration feeder according to claim 9, wherein the vibration exciter is fixed to a lower surface of the conveyance path.
The vibration device according to claim 6 is attached to an article, and the article is vibrated by adjusting the vibration frequency of the vibrator based on the relationship between the vibration frequency around the eigenvalue of the vibration apparatus and the beam acceleration. A method of vibrating an article.
The vibration device according to claim 6 is attached to a mold, and the vibration of the vibrator is adjusted by adjusting the vibration frequency based on the relationship between the vibration frequency near the eigenvalue of the vibration device and the beam acceleration. Exciting method for formwork for concrete secondary products.
The vibration device according to claim 6 is attached to the conveyance path of the vibration feeder, and the vibration frequency of the vibrator is adjusted based on the relationship between the vibration frequency near the eigenvalue of the vibration device and the beam acceleration to vibrate the conveyance path. A method of exciting a vibration feeder, characterized in that: