JPH0977232A - Explosion-proof type oscillating parts feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an explosion-proof type oscillating part for the torsional vibration of a bowl. SOLUTION: An unbalanced weight of semi-circular shape is fitted to a rotary shaft 34a, and the like, and gears of the same tooth number fitted to the rotary shaft 34a, and the like are engaged with each other and fixed on a base plate 24. A movable plate 22 integrated with an upper bowl 11 is supported on the base plate 24 by four inclined leaf springs 23, and an output shaft of an explosion-proof motor 38 at a stationary place away from the base plate 24 is connected to the rotary shaft 34a of either unbalanced weight 35a by a universal joint 37. The torsional vibration is given to the bowl 11 by the centrifugal force generated by a pair of unbalanced weights 35a, 35b which are rotated in the opposite direction to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosion-proof vibrating parts feeder, and more particularly to an explosion-proof vibrating parts feeder that is excited by the centrifugal force of unbalanced weights rotating in opposite directions. Is.

[0002]

2. Description of the Related Art Vibratory parts feeders are widely used because of their relatively simple structure, easy maintenance, and excellent controllability, but most of them are driven by electromagnets wound with coils. ing.

(First Conventional Example) FIG. 7 is a partially cutaway side view of a typical vibrating parts feeder 2. A bowl 51 as a vibrating tray for accommodating and transferring articles and a drive section 61 for imparting torsional vibration to the bowl 51. It consists of In the drive unit 61, a movable block 62 fixed integrally with the bottom plate of the bowl 51 and also serving as a movable core is coupled to a lower fixed block 64 by inclined leaf springs 63 arranged at equal angular intervals. An electromagnet 66 around which a coil 65 is wound is provided on 64 so as to face the movable block 62 with a slight gap. The soundproof cover 6 is provided around the drive unit 61.
7, the drive unit 61 is installed on the floor 69 together with the bowl 51 via a vibration-proof rubber 68. And
When the coil 65 is energized with an alternating current and the electromagnet 66 is excited, the bowl 51 is attracted against the inclined leaf spring 63, and is repeatedly repulsed by the spring action, thereby giving a torsional vibration.

The coil 65 wound around the electromagnet 66 has a risk that the insulation may be broken and a spark may be generated for some reason. However, if the coil 65 close to the movable block 62 is sealed. Is difficult to do,
The vibrating parts feeder 2 of the first conventional example which uses the electromagnet 66 for the drive unit 61 is restricted to use in a place where gas of a flammable organic solvent is generated or a place where flammable dust such as powdered food floats. There is.

(Second Conventional Example) There is a vibrating parts feeder which uses a vibrating motor as a non-electromagnetic device. For example, FIG. 8 shows a vibrating part feeder 3 disclosed in "Vibrating Part Conveyor" disclosed in Japanese Patent Publication No. 59-13406.
8A is a plan view of the drive unit 71 excluding the bowl, and FIG. 8B is [B] − in FIG. 8A.
It is a side view of the [B] line direction.

Two vibration electric conductors M are mounted on a base plate 79 which is installed on the floor surface 69 via a vibration-proof coil spring 68.
₁ and M ₂ are fixed by meshing gears 74a, 74b having the same number of teeth attached to the respective rotating shafts 72a, 72b, and half-moon shaped unbalanced parts at the other ends of the rotating shafts 72a, 72b, respectively. Weights 73a and 73b are attached. Further, four sets of rubber spring units 75 corresponding to the inclined leaf springs 63 of the first conventional example are provided by welding two sets each. That is, the rubber spring 78 is incorporated between the movable plate 76 that is fixedly hung from the upper bowl and the fixed plate 77 that is vertically fixed to the base plate 79. Then, the centrifugal force generated when the unbalanced weights 73a and 73b of the oscillating motors M ₁ and M ₂ are reversely rotated in synchronization with the gears 74a and 74b is transmitted by the rubber spring unit 75 and is torsionally oscillated to the upper bowl. Is given.

The vibrating parts feeder 3 of the second conventional example has a vibration balance problem due to the installation of two heavy vibration conducting machines on the base plate 79, and the vibrating electric motor M ₁ is required to provide explosion-proof property. , M ₂ must have a pressure-resistant closed structure, which is a great technical and cost difficulty.

(Third Conventional Example) There is a system utilizing air pressure as a device which is not electromagnetically excited. FIG. 9 is a principle diagram of a system in which a piston is reciprocated by alternating air pressure. Compressed air from the left side is converted into alternating air pressure of a predetermined frequency by a fluid disk element 81 to reciprocate the piston 82, and the piston 82 is shown in the drawing. The bowl bottom 83 is excited via the unloaded rod. In this method, originally, DC air pressure must be converted into alternating air pressure, and there is a difficulty in that the natural frequency on the bowl side and the frequency of alternating air pressure must match.

(Fourth Prior Art) Further, as another method using air pressure, a vibrating parts feeder using a nozzle and a flapper as shown in FIG. 10 has been proposed. Compressed air generated by the compressor 91 is blown through a filter 92 and a constant pressure device 93 from a nozzle 95 equipped with a pressure gauge 94 to a flapper 97 fixed to the bottom of the bowl 96. The flapper 97 is biased by a spring 98 supporting the bowl 96. Therefore, the interaction between the pressure of the compressed air and the spring force of the spring 98 excites the bowl 96. In this method, amplitude control is difficult, oscillation is unstable, and air blowing noise is large.

Further, the method utilizing air pressure has a drawback that a large amount of compressed air is required in common in the third conventional example and the fourth conventional example, and it is technically complicated and put to practical use. Has not reached the level.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a low-cost explosion-proof vibrating parts feeder based on a simple method.

[0012]

The above object is to provide a bowl provided with a spiral track, a movable plate integral with the bottom plate of the bowl, and a plurality of tilts arranged at equal angular intervals with respect to the movable plate. An unbalanced weight is attached to a lower base plate connected by a leaf spring or an equivalent spring, and a rotation shaft fixed to the surface of the base plate or the lower surface of the movable plate and rotating in opposite directions by gears, in relation to the rotation direction. It consists of an exciter mounted so as to be in the same phase and an explosion-proof motor connected to the rotary shaft of the exciter, and the unbalanced weights are driven by the explosion-proof motor in opposite directions. It is achieved by a vibrating parts feeder characterized in that the bowl is torsionally vibrated by the centrifugal force generated by the vibrating parts feeder.

[0013]

Operation: A pair of unbalanced weights of a vibration exciter are driven by a pressure-proof explosion-proof motor to rotate in opposite directions, and the centrifugal force generated causes torsional vibration of the bowl. No sparks will occur.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An explosion-proof vibration part feeder according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of an explosion-proof type vibration parts feeder 1 of this embodiment, and FIG. 2 is [2] -in FIG.
[2] It is a top view of a line direction. The explosion-proof vibrating parts feeder 1 comprises a bowl 11 for accommodating and transferring articles and a drive section 21 for applying torsional vibration to the bowl 11. Bowl 11
Although not shown, a track serving as an article transfer path is formed in a spiral shape from the bottom surface of the bowl 11.

In the drive unit 21, a bottom plate 12 integral with the bottom surface of the bowl 11 is fixed to a cross-shaped movable plate 22 with bolts 13. The movable plate 22 is connected to a lower base plate 24 by four inclined leaf springs 23 fixed to a cross-shaped tip portion, and the base plate 24 is installed on a floor 29 via a vibration-proof rubber 25.

On the base plate 24, a vibrator 31 having a pair of half-balanced unbalanced weights 35a and 35b as shown in FIG. 3 is fixed. That is, one unbalanced weight 35a is attached to the rotary shaft 34a that is supported by the bearing 33a in the casing 32a, and the nylon gear 3 is provided outside the casing 32a.
6a is attached to the rotating shaft 34a. The other unbalanced weight 35b is also made of the same material,
Gears 36a and 36b having the same number of teeth are meshed with each other, and unbalanced weights 35a and 35b are arranged on both sides thereof.
That is, the unbalanced weights 35a and 35b are synchronously rotated in the opposite directions. The unbalanced weights 35a and 35b are attached to the rotary shafts 34a and 34b so as to have the same phase with respect to the rotation angle. That is, when one unbalanced weight 35a is at the most distant angle with respect to the meshing position of the gears 36a and 36b, the other unbalanced weight 35b is also attached so as to be at the most distant angle from the same standard. Has been.

Then, rotation 3 of one unbalanced weight 35a
4a is led out to the side opposite to the gear 36a, and is connected by a universal joint 37 to an output shaft of a flameproof explosion-proof motor 38 installed on a pedestal 39 on the floor 29 at a place apart from the base plate 24.

The explosion-proof vibration part feeder 1 of the embodiment is constructed as described above, and its operation will be described below.

Referring to FIGS. 1 and 2, the flameproof explosion-proof motor 3
8 is started, its output shaft and universal joint 3
Rotating shaft 3 of one unbalanced weight 35a connected by 7
When 4a is rotated, the other unbalanced weight 35b on the rotary shaft 34b connected by the gears 36a and 36b is rotated in the opposite direction in synchronization with the unbalanced weight 35a.

FIG. 4 is a diagram showing the mounting angles of the unbalanced weights 35a and 35b, the positions at 90-degree intervals while they are rotated, and the direction of the centrifugal force at that time. That is, when the unbalanced weight 35a is rotated clockwise at the angular velocity ω,
At A, the centrifugal force Fa is directed to the right, the other unbalanced weight 35b is rotated counterclockwise at the angular velocity ω ′, and the centrifugal force Fb is directed to the left. Therefore, synthetic centrifugal force F
Is 0 in the vertical direction, but referring to FIG. 2, centrifugal forces Fa and Fb indicated by arrows are generated at the centers of the unbalanced weights 35a and 35b. 24 receives a counterclockwise rotation moment FaL in the horizontal plane.

B of FIG. 4 rotated 90 degrees from A of FIG.
, The centrifugal force Fa of the unbalanced weights 35a, 35b,
Since both Fb are downward, the combined centrifugal force F is downward and no rotational moment is generated. Therefore, the base plate 24 is vibrated downward as shown by the white arrow. Similarly, in C of FIG. 4 rotated 90 degrees from B of FIG. 4, centrifugal forces Fa and F of the unbalanced weights 35a and 35b are generated.
Since b is oriented in the direction exactly opposite to that shown in FIG. 2, the base plate 24 receives a clockwise rotation moment FaL in the horizontal plane and is 0 in the vertical direction. Further, in D of FIG. 4, the centrifugal force F of the unbalanced weights 35a and 35b is
Since both a and Fb are upward, the combined centrifugal force F is upward as indicated by the white arrow, and no rotational moment is generated. Therefore, the base plate 24 is vibrated upward. That is, the base plate 24 is vibrated in the clockwise and counterclockwise directions in the horizontal plane and in the vertical direction while the pair of unbalanced weights 35a and 35b are rotated once in the opposite directions. The vibration applied to the base plate 24 is transmitted to the movable plate 22 and the bowl 11 fixed to the movable plate 22 via the inclined leaf spring 23, and the bowl 11 is torsionally vibrated. Further, since the gears 36a and 36b are made of nylon, not only sparks are not generated during operation, but also lubricating oil is unnecessary and noise is not generated.

The explosion-proof vibration part feeder 1 of the present embodiment is constructed and operates as described above, but as described above, the pressure-resistant explosion-proof motor 38 which is widely commercially available and easily available is used as the drive source for the drive section 21. However, no electromagnetic device is used for the vibration, and the centrifugal force generated by mechanically rotating the pair of unbalanced weights 35a and 35b in the opposite directions and the inclined leaf spring 23 are used. Torsional vibration is applied to the bowl 11. Therefore, the explosion-proof vibration parts feeder of the present invention has a pressure-proof explosion-proof structure defined in JIS C0903 and corresponds to an explosion class of 2 and an ignition degree of G4, and can be used in one or two types of hazardous areas. .

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

For example, in this embodiment, the unbalanced weights 35a and 35b are provided on both sides of the meshed gears 36a and 36b.
However, the unbalanced weight 35 is attached to one side of the gears 36a 'and 36b' meshed as shown in FIG. 5 corresponding to FIG.
You may arrange a ', 35b' in equilibrium. In addition, in FIG. 5, for the same elements as those shown in FIG.
The same reference numeral is attached.

Further, in the present embodiment, the vibrator 31 is fixed to the surface of the base plate 24, but the same torsional vibration can be applied to the bowl 11 even if it is fixed to the lower surface of the movable plate 22.

Further, in the present embodiment, the base plate 24 to which the vibrator 31 is fixed and the movable plate 22 to which the bowl 11 is fixed are connected by four inclined leaf springs 23, but instead of the inclined leaf springs 23, It is also possible to employ a rubber spring that acts similarly. FIG. 6 shows an example of a rubber spring. A rubber spring 103 is press-fitted and bonded between a concentric inner cylinder 101 and an outer cylinder 102, and the lower end of the outer cylinder 102 is fixed to a mounting member 124C to a base plate 124. The upper end of 101 is fixed to a mounting member 122C of the movable plate 122.

Further, in the present embodiment, the unbalanced weight 3
Although 5a and 35b have a half-moon shape, they may have any shape as long as they give an unbalanced weight. In addition, by making the unbalanced weights 35a and 35b of a type capable of weight adjustment, the magnitude of the centrifugal force and the magnitude of the torsional vibration force are adjusted with both the angular velocity of rotation and the weight of the weight as variables. obtain.

Further, although the explosion-proof vibration part feeder 1 of the present embodiment is premised on being used in an explosive atmosphere, it goes without saying that it can also be used in a non-explosive atmosphere. Yes.

[0030]

As described above, according to the explosion-proof vibration parts feeder of the present invention, although the pressure-resistant explosion-proof motor is used as the drive source, the electromagnetic system is not used at all for the vibration of the bowl. Since a pair of unbalanced weights are mechanically rotated in opposite directions and the generated centrifugal force excites the bowl, there is no fear of sparking and the transfer of articles by torsional vibration in an explosive atmosphere. Can be achieved easily and at low cost.

[Brief description of drawings]

FIG. 1 is a side view of an explosion-proof vibration part feeder according to an embodiment.

FIG. 2 is a plan view taken along the line [2]-[2] in FIG.

FIG. 3 is a side view of the unbalanced weight used in the embodiment.

FIG. 4 shows a mounting angle of a pair of unbalanced weights, a rotation direction, a direction of generated centrifugal force, and a vertical direction of a combined centrifugal force in the example.

FIG. 5 is a plan view similar to FIG. 2, showing another arrangement of unbalanced weights according to a modification.

FIG. 6 is a vertical cross-sectional view of a rubber spring that replaces the inclined leaf spring.

FIG. 7 is a partially cutaway side view of a vibrating parts feeder of a first conventional example.

FIG. 8 shows a drive unit of a vibrating parts feeder of a second conventional example, FIG. 8A is a partially cutaway plan view, and FIG. 8B is FIG.
FIG. 6B is a cross-sectional view taken along line A-B of FIG.

FIG. 9 is a principle view of a method of vibrating a bowl by reciprocating a piston with alternating air pressure of a third conventional example.

FIG. 10 is a principle view of a system of vibrating a bowl by a combination of an air ejection nozzle and a flapper of a fourth conventional example.

[Explanation of symbols]

 1 Explosion-Proof Vibration Part Feeder 11 Bowl 21 Drive Unit 22 Movable Plate 23 Inclined Leaf Spring 24 Base Plate 31 Exciter 34 Rotating Shaft 35 Unbalanced Weight 36 Gear 37 Universal Joint 38 Flameproof Explosion-Proof Motor

Claims (3)

[Claims] 1. A bowl having a spiral track, a movable plate integral with a bottom plate of the bowl, and a plurality of inclined leaf springs equidistantly arranged with respect to the movable plate or springs equivalent thereto. And the lower base plate and the surface of the base plate or the lower surface of the movable plate, and the unbalanced weights are attached to the rotating shafts that rotate in opposite directions by gears so that they are in the same phase with respect to the rotating direction. A shaker and an explosion-proof motor connected to the rotary shaft of the shaker, and the unbalanced weights are rotated in opposite directions by being driven by the explosion-proof motor, and the centrifugal force generated causes the unbalanced weight to rotate. A vibrating parts feeder characterized by the torsional vibration of the bowl. 2. The explosion-proof vibration according to claim 1, wherein the explosion-proof motor is provided at a stationary position apart from the base plate, and is connected to the rotary shaft of the vibration exciter via a universal joint. Parts feeder. 3. The explosion-proof vibration part feeder according to claim 1, wherein the gear is a plastic molded product.