JP2597924Y2 - Vibration sieve device - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] The present invention is intended for classification, sorting,
The present invention relates to a vibration sieve device used for filtration or the like.

[0002]

2. Description of the Related Art Conventionally, as an example of this type of vibrating sieve, there is a type shown in FIGS. 1 in the figure
Is a sieve frame having a circular shape, and a discharge port 2 is provided in a wall portion. The sieve frames 1 are provided, for example, in three layers vertically and are connected and fixed to each other. Further, a sieve net 3 is stretched horizontally in a lower portion of each of the upper and middle sieve frames 1 by a structure to be described later, and a combination of these sieve frames 1 and the sieve net 3 constitutes an upper and lower two-stage unit. Have been. In addition, the upper and lower two-stage screen 3 is the lower screen 3
It is rough compared to.

A structure for attaching a sieve net to a sieve frame is as follows.
As shown in FIG. The sieve net 3 is fixed to a net fixing ring 4. This mesh fixing ring 4 is used for each sieve frame 1.
Is pressed from above through a packing 6 by a ring presser 5 attached to the lower part of the housing, and is supported from below by a ring packing 8 arranged in a net hit receiver 7.

[0004] The net hitting tray 7 is sandwiched by the frame packing 9 disposed together with the center shifter 24 at a connection portion between the upper and lower screen frames 1 and 1. The upper sieve frame 1 and the lower sieve frame 1 are fastened by a band 10.

The net hitting tray 7 is for placing a net hitting ball 11 below the sieve net 3, and has a dish shape having a large number of holes 7a through which powder particles pass. A lid 13 having an input port 12 is placed on an upper opening portion of the upper sieve frame 1,
A bottom plate 14 is attached to the lower opening of the lower stage. Lid 1
3 and the sieve frame 1, and the bottom plate 14 and the sieve frame 1 are connected and fixed by a band 15.

The lower sieve frame 1 is provided with a lower supporting frame 16.
A plurality of locations in the circumferential direction of the lower supporting frame 16 are supported from below by a vertically disposed compression coil spring 17. The compression coil spring 17 is mounted on a base 18 installed on the floor.

The compression coil spring 17 is supported by spring supports 19 attached to the lower surface of the lower support frame 16 and the upper surface of the base 18, respectively. That is, the upper end surface of the compression coil spring 17 abuts on the lower surface of the lower support frame 16,
The lower end surface is in contact with the upper surface of the base 18.

Each spring support 19 is inserted inside the end of the compression coil spring 17 to support the compression coil spring 17 so as to prevent its movement, and has a circular cross section. For the purpose of supporting the compression coil spring 17 as shown in FIG.
And the length of the spring support 19 is set to a predetermined size. The spring support 19 is fixed to the lower support frame 16 and the base 1 by bolts 25.
8 attached.

Further, a vibration motor 21 is mounted on a motor support frame 20 provided on the lower sieving frame 1 so as to extend vertically. An upper weight 22 is attached to the upper end of the rotating shaft of the vibration motor 21, and a lower weight 23 is attached to the lower end.

In order to prevent the vibration sound generated by the vibration motor 21 from being diffused, the vibration motor 21 is provided on the upper surface of the base 18.
A baffle plate 18a surrounding the baffle plate 21a is formed on the lower surface of the lower supporting frame 16.

When the vibration motor 9 is driven to rotate the upper weight 22 and the lower weight 23, the three-stage sieve frame 1 supported by the compression coil spring 17 vibrates in the horizontal direction.

When the powder material is put into the upper screen frame 1 from the inlet 12 of the lid 13, the powder material is vibrated by the screen frame 1 and the screen 3 so that the mesh of the upper screen 3 is meshed. Larger particles and smaller particles are classified and sorted. The former particles are discharged to the outside from the outlet 2 of the upper screen frame 1, and the latter particles pass through the upper screen 3 in the middle screen. Falls into the sieve frame 1.

In the middle sieving frame 1, the powders are classified and sorted into particles larger and smaller than the mesh of the middle sieving net 3, and the former particles are discharged from the outlet 2 of the middle sieving frame 1. , And the latter particles fall through the middle screen sieve 3 and fall into the lower screen frame 1.

In the lower sieve frame 1, the powder particles are received by the bottom plate 14 and discharged from the discharge port 2 to the outside. In addition, the net striking receiver 7 vibrates together due to the vibrations of the upper screen frame 1 and the middle screen frame 1, whereby the net striking ball 11 vibrates and strikes the sieve mesh 3, and the sieve mesh 3 becomes clogged. Can be used to knock down the powder particles to prevent clogging of the sieve mesh.

[0015]

However, in such a vibrating sieve apparatus, the vibrating sieve apparatus vibrates a sieve frame and a sieve mesh for classifying and sorting the powder particles. There is a problem that noise (vibration noise) is generated.

The following two factors are major factors in generating noise. One of the noises is the noise generated when the compression coil spring 17 supporting the sieve frame 1 at the time of vibration is in sliding contact with the spring support 19 supporting the same. Spring support 19
4 has a circular cross section having a diameter large enough to contact the inner surface of the wire of the compression coil spring 17 from the concept of supporting the spring 17 as shown in FIG. The circular cross section has a round bar shape extending linearly in the axial direction of the compression coil spring 17.

On the other hand, when the compression coil spring 17 is displaced in a horizontal direction, a vertical direction and a direction in which these directions are combined at a predetermined frequency during the vibration of the sieve frame 1, the strands of the compression coil spring 17 are continuously changed. Instead, it comes into sliding contact with the outer peripheral surface of the spring support 19. For this reason, a loud vibration sound is generated. Since the compression coil spring 17 is formed of metal,
Although the spring support 19 is made of synthetic resin to reduce the generation of vibration noise, the effect is not sufficiently raised.

Another element is a sound generated when the screen hitting ball 11 collides with the screen hit receiver 7 when the screen frame 1 vibrates. The vibration of the sieve frame 1 causes the ball 11 to constantly collide with the net hit receiver 7, thus generating noise. The sound leaks out from the inlet 12 of the upper sieve frame 1 and the outlet 2 of the lower sieve frame 1, respectively.

As described above, the conventional vibration sieving apparatus has a problem that the working environment is deteriorated due to the generation of noise, and it has been demanded to suppress the generation of noise to improve the working environment. For example, a pharmaceutical company or the like sometimes installs a vibration sieving apparatus inside a clean room, but this clean room is generally small. When the vibration sieving apparatus is operated in this small clean room, the noise inside the room is very loud and the working environment is very bad, and there is a demand for improvement.

The first invention has been made based on the above circumstances, and is a low-noise type which can suppress generation of noise due to sliding contact between a spring supporting the sieve frame and the spring support without impairing the function of the spring support. It is an object to provide a vibrating sieve device.

The second invention has been made based on the above circumstances, and provides a low-noise type vibration sieve device which can reduce the leakage of noise generated by the movement of a net hitting ball hitting a sieve net to the outside. The purpose is to:

[0022]

According to a first aspect of the present invention, there is provided a vibrating screen apparatus for vibrating a unit having a screen provided inside a screen frame. A compression coil spring for supporting and a spring support made of synthetic resin inserted into and supporting an end of the compression coil spring, and a base end of the spring support has an outer peripheral surface formed on an inner peripheral surface of the compression coil spring. And a portion from the base end to the distal end of the spring support is formed as a tapered portion that becomes thinner toward the distal end.

According to a second aspect of the present invention, there is provided a vibration sieve device for vibrating a unit having a sieve net provided inside a sieve frame, wherein a lid for covering an upper surface opening portion of the sieve frame and a lower surface opening portion for the sieve frame. A bottom plate formed of a vibration damping metal plate, and a net hitting receiver provided on the lower side of the sieve net and receiving a net hit ball hitting the sieve net is formed of a damping metal plate. I do.

[0024]

According to the first aspect of the present invention, since the spring support has a tapered portion that becomes thinner toward the tip, the area where the compression coil spring comes into contact with the spring support is reduced as compared with the prior art, and the operation of the vibration sieving device is accordingly reduced. In some cases, the generation of noise due to the sliding contact between the compression coil spring and the spring support is reduced.

That is, although it has conventionally been thought that the entire axial direction of the spring support must not be in contact with the compression coil spring, the inventor of the present invention has conducted various studies and found that the spring support is tapered. However, it was found that the spring bent by the vibration was received by the tapered portion of the spring support and the spring did not move. The first idea is based on this consideration.

In the second invention, a net hitting ball, which is hit by a net hitting ball, is formed of a damping metal plate to reduce the noise directly generated by the hitting of the net hitting ball, and to control the lid and the bottom plate. By forming the vibrating metal plate, the vibration of the lid and the bottom plate due to the collision between the netting ball and the net hit receiver during the operation of the vibrating screen device is reduced.

[0027]

An embodiment of the first invention will be described with reference to the drawings. The vibration sieve device of this embodiment has the same configuration as that of the vibration sieve device shown in FIGS. 2 and 3 except for the portion for supporting the spring. Therefore, description of these parts is omitted, and the spring support, which is a feature of the present invention, will be described with reference to FIG.

In FIG. 1, reference numeral 31 denotes a spring support which is inserted into the upper end and the lower end of a compression coil spring 17 for supporting the lower supporting frame 16 and which prevents the spring 17 from moving. It is formed with. The spring support 31 has a length corresponding to a predetermined plurality of pitches of the compression coil spring 17 for supporting the compression coil spring 17.

The proximal end (the end near the end of the compression coil spring 17) of the spring support 31 can have its outer peripheral surface in contact with the inner peripheral surface of the wire 17a forming the compression coil spring 17. A circular cross section having a diameter of an appropriate size is formed.
(One pitch). That is, it has a circular cross section that extends straight and parallel to the axial direction.

Further, the portion from the base end to the tip of the spring support 31 is formed as a tapered portion 31a whose diameter gradually decreases toward the tip. The degree of the taper in the tapered portion 31a is set to a size that can prevent the compression coil spring 17 from coming off the spring support 19 when the compression coil spring 17 vibrates and is greatly inclined with respect to the vertical direction. That is, the outer peripheral surface of the tapered portion 31a can suppress the bending of the compression coil spring 17 so that the compression coil spring 17 does not come off from the spring support 19 when the compression coil spring 17 is largely bent and comes into contact. .

The tapered portion 31a is connected to the compression coil spring 17
Does not come into contact with the inner peripheral surface of the element wire 19a that forms
The spring support 31 is connected to the lower surface of the lower support frame 16 and the base 1.
8 are arranged in contact with the upper surface of the base 8, and are attached to the base 18 on the lower supporting frame 16 by bolts 25.
As a result, the spring support 31 is inserted inside the upper end and the lower end of the compression coil spring 17 and
Support.

The operation in the case where the compression coil spring 17 is supported using the spring support 31 having such a configuration will be described. When the vibrating sieving apparatus is rated and the compression coil spring 17 is vibrating in a standard state, the compression coil spring 17 is stabilized by the base end of the spring support 31 that contacts the inner peripheral surface of the wire. Supported and spring support 31
There is no departure from. That is, the base end of the spring support 31 has a compression coil spring 17 vibrating in a standard state.
I support.

In this case, the tapered portion 31a of the spring support 31
Does not come into contact with the inner peripheral surface of the wire 19a forming the compression coil spring 17. For this reason, when the compression coil spring 17 is vibrating in a standard state, the degree of noise generated by the compression coil spring 17 sliding on the tapered portion 31a of the spring support 31 is greatly reduced.

When the compression coil spring 17 is abnormally greatly bent for some reason, the compression coil spring 17 comes into contact with the outer peripheral surface of the tapered portion 31a of the spring support 31 to prevent further bending. Is done. Therefore, the compression coil spring 17 does not come off from the spring support 31 even when the compression coil spring 17 is abnormally greatly bent.

That is, the tapered portion 31a does not make contact with the compression coil spring 17 when the compression coil spring 17 is vibrating in the standard state, thereby reducing the generation of noise, and the compression coil spring 17 is abnormally greatly bent. In this case, the movement of the compression coil spring 17 is prevented.

As described above, according to the first invention, the generation of noise due to the friction between the spring supporting the sieve frame and the spring support can be significantly reduced without impairing the function of the spring support. For example, the sound of a vibration sieving device using a conventional spring support was measured and found to be 77.5 dB. On the other hand, the sound of the vibration sieving device using the spring support of the present invention was measured to be 73 dB.

An embodiment of the second invention will be described with reference to the drawings. The vibration sieve device of this embodiment is intended for the device having the configuration shown in FIGS.

In this vibrating sieve apparatus, a mesh hitting tray 7 provided on each lower side of the upper sieve frame 1 and the middle sieve frame 1 and a lid 1 provided on the upper sieve frame 1 are provided.
3 and a bottom plate 14 provided on the lower sieve frame 1 are formed of a damping metal plate.

The damping metal plate has a soundproofing effect as compared with a normal metal plate. The damping metal plate is formed by sandwiching an intermediate layer resin made of a viscous elastic material having excellent vibration damping properties between two metal plates, for example. As a result, shearing deformation occurs. At this time, the vibration energy is converted into heat energy, and the vibration is attenuated.

When the vibrating sieve device thus constructed is operated, the net striking balls 11 placed on the net striking trays 7 provided on the upper and middle sieve frames 1 are continuously moved to the net striking trays 7. collide. Here, since the net hit receiver 7 is formed of a vibration damping metal plate, it is directly generated by the collision between the net hit ball 11 and the net hit receiver 7 as compared with the case where the net hit receiver 7 is formed of a normal metal plate. Vibrating noise is reduced.

When the net hit receiver 7 vibrates due to the collision with the net hit ball 11, the lid 13 and the bottom plate 14 vibrate together. Here, since the lid 13 and the bottom plate 14 are formed of a vibration-damping metal plate, the collision between the net hitting ball 11 and the net hit receiver 7 is greater than when the lid 13 and the bottom plate 14 are formed of a normal metal plate. Vibration noise generated directly is reduced.

From these facts, in the vibration sieving device, the noise generated by the vibration of the net hitting ball 11 leaking out from the discharge port 2 and the input port 12 to the outside can be greatly reduced as compared with the conventional one, and the noise is reduced. Work environment can be realized.

[0043]

As described above, according to the first invention, a low-noise type vibration that can suppress generation of noise due to friction between the spring supporting the sieve frame and the spring support without impairing the function of the spring support. A sieve device can be obtained.

According to the second aspect of the present invention, it is possible to obtain a low-noise vibrating sieve device capable of reducing the noise generated by the vibration of the net hitting ball hitting the sieve net from leaking to the outside.

[Brief description of the drawings]

FIG. 1 is a diagram showing a spring support provided in a vibration sieve device according to the first invention.

FIG. 2 is a sectional view showing an example of a vibration sieve device.

FIG. 3 is an enlarged view showing a mounting portion of a sieve net provided in the vibration sieve device.

FIG. 4 is a view showing a spring support provided in a conventional vibration sieve device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Sieve frame, 2 ... Outlet, 3 ... Sieve mesh, 7 ... Net hitting receptacle 11 ... Net hitting ball, 12 ... Input port 13 ... Lid,
14: bottom plate, 16: lower support frame, 16: lower support frame, 17: compression coil spring, 18: base,
19 ... Spring support, 21 ... Vibration motor, 25
... bolt, 31 ... spring support, 31a ... taper part.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 63-9272 (JP, U) Japanese Utility Model Showa 52-90770 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B07B 1/00-1/62

Claims (2)

(57) [Scope of request for utility model registration] 1. A vibrating sieve device for vibrating a unit having a sieve net provided inside a sieve frame, a compression coil spring supporting the sieve frame, and a composite inserted into an end of the compression coil spring to support the same. A spring support made of resin is provided, and a proximal end of the spring support has a circular cross section whose outer peripheral surface is in contact with an inner peripheral surface of the compression coil spring, and a distal end from the proximal end of the spring support. Is formed as a tapered portion that becomes thinner toward the tip. 2. A vibrating sieve apparatus for vibrating a unit having a sieve net provided inside a sieve frame, wherein a lid for covering an upper opening portion of the sieve frame and a bottom plate for covering a lower opening portion of the sieve frame are a vibration damping metal plate. A vibrating sieve device, characterized in that a net hit receiver provided below the sieve net and receiving a net hit ball hitting the sieve net is formed of a damping metal plate.