JPH0380550B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a multi-stage sieving device that sieves each particle size in order to measure the particle size of granular materials such as ore, coal, coke, and limestone. It is.

[Conventional technology]

As a conventional technique for measuring the particle size after sieving powder or granules, there is a technique disclosed in Japanese Patent Publication No. 43189/1989.

As shown in FIG. 7, the above-mentioned conventional technology has a plurality of sieve frames a each having meshes classified by particle size that become smaller as they reach the lower stage.
and a sieve frame a' having a bottom plate with no mesh at the bottom are stacked and attached to a storage case b, and the bottom frame f of this storage case b is supported on the base d by a plurality of movable support fittings c. The device is vibrated by a vibrating device e provided at the bottom of the case b.

Each of the sieve frames a' and a is swingably attached at its rear end to the side frame of the storage case b by a shaft g, and a cylinder h for tilting each of the sieve frames a is provided on the bottom frame f. be.

In the front part of each of the above-mentioned sieve frames a and a', each of the sieve frames a,
Each sieve frame and gate plate i are locked by a locking device (not shown) that is driven by an electromagnetic cylinder (not shown), etc., which opens by its own weight when a' is rotated downward, and closes when it is in a horizontal state. It is rotatably provided.

Furthermore, a sample receiving chute j is provided above the sieve frame a at the upper end, and a lower receiving chute k is provided near the front lower part of each of the sieve frames a and a'.

The operation of the prior art described above is as follows: First, all the sieve frames a and a' are maintained horizontally by a locking device, and then the vibration device e is operated to vibrate each sieve frame a and a' together with the storage case b.

On the other hand, when a sample collected at a desired location is put into the uppermost sieve frame a, the powder particles smaller than the sieve size of the sample fall into the lower sieve frame a, and those with the smallest particle size The sieving ends when the sieve reaches the bottom sieve frame a′.

When the sieving is completed as described above, the locking device of the lowermost sieve frame a' is released and only the lowermost sieve frame a' is tilted downward by the cylinder h, and the gate of the lowermost sieve frame a' is Plate i opens and the finest sample inside it is discharged into chute k.

Next, the locking device of the second sieve frame a from the bottom is released, and the second sieve frame a from the bottom is tilted downward by its own weight.

By repeating the same operation, the uppermost sieve frame a
The work is completed when the sample inside is finished being discharged.

[Problem to be solved by the invention]

When sieving a sample, if the type of powder or granular material to be sieved is different, it is necessary to replace the sieve frame with a sieve frame having a different mesh size.

However, as mentioned above, each sieve frame a and a' has an axis g
In the structure in which the sieve frame a is attached to the storage case b, it is extremely troublesome to remove the shaft g each time the sieve frame a is replaced, and with this structure, it is impossible to make the sieve frame a automatically replaceable. There is.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a sieving device for powder and granular material that can be easily changed between different sieves and can be automated.

[Means to solve the problem]

In order to achieve the above object, the technical means taken by the present invention are a vertical drive shaft provided on one of a pair of columns facing each other on a base, and a vertical drive shaft provided on the other column. A vibration mechanism consisting of a driven shaft, eccentric means fixed to the upper and lower parts of both shafts, an upper arm fitted in the upper eccentric means, and a vibration table provided on the lower eccentric means, and connected to the upper arm and the vibration table. The screen consists of a sieve holding plate guided by two vertical rods and moved up and down by a cylinder, a hammering mechanism for hitting the sieve holding plate with a hammer, and a sieve positioning mechanism installed upright from above the base. .

[Effect]

Stack multiple sieves with different meshes on a shaking table,
After introducing the sample from above the sieve, the cylinder is actuated to lower the sieve holding plate, the upper sieve is closed, and all the sieves are fixed on the vibrating table. The sample is sieved by swinging the vibrating table on which the sieve is mounted through the sieve in a horizontal axis, and by intermittently operating the hammer of the hammering mechanism to strike the holding plate.

After the above sieving, the holding plate is raised, and the sieve positioning mechanism is activated to move the sieve on the vibrating table, which has stopped at an arbitrary position, to a fixed position, and at this position, the sieved sample is contained. The sieves are sequentially taken out by a conveying means (not shown).

In this way, by moving the sieve to a fixed position regardless of the stopping position of the vibrating table, automatic removal by the conveying means is facilitated.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

In the embodiments shown in FIGS. 1 to 4, A
is a vibration mechanism and is constructed as follows.

In other words, 1 is a gear box provided on a base 1a, and 2 are arranged oppositely on the upper part of this gear box 1.
A book support 2 is erected and a boss portion 2a is provided at its upper end. A drive shaft 3 that passes through the gearbox 1 and extends upward beyond the boss portion 2a is rotatably mounted on one of the columns 2, and a driven short shaft 4 is also attached to the boss portion 2a on the other column 2. Further, a driven short shaft 5 coaxial with the short shaft 4 is rotatably mounted on the gearbox 1.

Eccentric blocks 6 as eccentric means are fixed to the upper and lower portions of the drive shaft 3 and the short driven shafts 4 and 5, respectively.

Then, both boss portions 7a of the upper arm 7 are fitted onto the outer peripheries of both the upper eccentric blocks 6, and both boss portions 8a of the vibration table 8 are fitted onto the outer peripheries of both the lower eccentric blocks 6.

Reference numeral 9 denotes a motor provided on the base 1a, and this motor 9 drives an input shaft 10 provided in the gearbox 1.

The input shaft 10 has a worm 1 as shown in FIG.
1 is fixed, and the drive shaft 3 is driven by meshing the worm 11 with a worm wheel 12 provided at the lower end of the drive shaft 3. Therefore, when the drive shaft 3 is rotated by the motor 9, the upper arm 7 and the vibration table 8 are rotated through the eccentric block 6.
swings in the horizontal plane.

Note that the driven shafts 4 and 5 may be one driven shaft that reaches from the lower end to the upper end, and may also be driven by the same driving means as the drive shaft 3.

Reference numeral 13 in FIG. 2 denotes a sieve holding plate that moves up and down guided by two vertical guide rods 14 connected to the upper arm 7 and the vibrating table 8, and this holding plate is raised and lowered by a cylinder 15 on the vibrating table 8. It's becoming like that.

B is a hammering mechanism, which is constructed as follows.

The base of a hammer 17 is swingably attached to a support 16 erected on the gearbox 1 behind the support 2 by means of a pin. Further, the tip of the hammer 17 extends to the center of the sieve holding plate 13.

The vicinity of the base of the hammer 17 is supported by the upper end of a vertical hammer shaft 18. This hammer shaft 1
The lower end of the gearbox 8 passes through the gearbox 1 and comes into contact with a cam 21 shown in FIG. 4, and is raised and lowered by the rotation of this cam 21.

That is, as shown in FIG. 4, the bevel gear 19 at the lower end of the shaft 3 and the bevel gear 22 at one end of the shaft 20 provided in the gearbox 1 are meshed, and the cam 21 is fixed to the other end of the shaft 20. .

Therefore, when the cam 21 is rotated by the motor 9 via the input shaft 10 etc., the hammer shaft 18 is raised and the hammer 17 is pushed up, transmitting the impact force at the time of the fall to the presser plate 13 and striking the presser plate 13. .

C is a sieve positioning mechanism, which is constructed as follows.

A support frame 23 is erected on the base 1a located at the rear of the gearbox 1, and four guide rods 24 extending from both sides of the support column 16 toward the front are horizontally fixed to the front surface of the support frame 23. A guide plate 25 is slidably fitted onto this guide rod.

As shown in FIG. 1, a patch plate 26 is fixed to the front surface of the guide plate 25 in a substantially V-shape, and a positioning cylinder 27 is provided at the rear of the guide plate 25. By operating this cylinder 27, the patch plate 26
advance and retreat.

28 is a photoelectric switch for sieve detection provided at a predetermined position such as on the support column 2.

FIG. 5 shows a circular sieve 29 and a circular sieve frame 29.
A sieve screen 29b is stretched inside a. Further, the lower part of the sieve frame 29a is tapered through a protrusion 29c extending around the entire circumference, and a packing ring 29d is attached to the lower part of the protrusion 29c to facilitate stacking. FIG. 6 shows a circular bottomed receiver 30 placed at the bottom of the vibration table 8.

Next, the operation of this embodiment will be explained.

With the sieve holding plate 13 raised by the cylinder 15 to the position indicated by the chain line in FIG. To go.

When the receiver 30 and all the sieves 29 are stacked up by the above operation, a sample from a sample can (not shown) is put into the uppermost sieve 29, and then the sieve holding plate 13 is lowered by the action of the cylinder 15. the top sieve 29
Press all the sieves 29 and receivers 30 onto the vibrating table 8.
Fix it on top.

After fixing the sieve 29 and receiver 30, when the vibration mechanism A is operated, the vibration table 8 swings from side to side in FIGS. 1 and 2, and each sieve 29 and receiver 30 are shaken by this swing. . On the other hand, the hammering mechanism B is activated, and the hammer 17 hits the sieve holding plate 13. As a result, the sample on the uppermost stage flows down, and the sieved sample enters each sieve 29 and receiver 30.

After a predetermined time, the vibration mechanism A and the hammering mechanism B are stopped. At this time, the stopping position of the vibration table 8 is not necessarily constant. Therefore, after the sieve holding plate 13 is raised by the cylinder 15, the sieve positioning mechanism C is activated. That is, by operating the cylinder 27, the entire sieves 29 and receivers 30 stacked on the vibrating table 8 are moved slightly forward and positioned by the backing plate 26 on the vibrating table 8. Each sieve 29 and receiver 30 positioned in this way are taken out one by one from above by a transport means (not shown) together with the sieved sample, and after being transported to the next processing step (weighing, discharging, etc.), they are placed on the shaking table 8 again. I'll post it.

〔Effect of the invention〕

Since this invention is configured as described above,
This produces the effects described below.

Since the sieves are stacked on the vibrating table, sieves with different mesh sizes can be easily changed for sieving a wide variety of powder and granular materials.

Furthermore, since the sieve is moved on the vibrating table by the sieve positioning mechanism, the vibrating table can be stopped at a predetermined position no matter where it is stopped. Therefore, the sieve can be reliably taken out by the conveying means, which is useful for automation.

Furthermore, the top sieve is covered with a sieve holding plate, and the stacked sieves are clamped and fixed so that they operate together with the vibrating table, and the vibrating table is vibrated. No falling off or spilling of powder inside the sieve.

[Brief explanation of drawings]

Fig. 1 is a plan view showing one embodiment of the present invention, Fig. 2 is a front view of the same as above, Fig. 3 is a side view of the same as above, Fig. 4 is a cross-sectional plan view along the line of Fig. 2, and Fig. 5 6 is a partially longitudinal front view showing a sieve, FIG. 6 is a partially longitudinal front view showing a receiver, and FIG. 7 is a longitudinal front sectional view showing a conventional example. 2... Strut, 3... Drive shaft, 4, 5... Driven shaft, 6... Eccentric block, 7... Upper arm, 8
... Vibration table, 13 ... Sieve holding plate, 14 ... Vertical guide rod, 15 ... Cylinder, 17 ... Hammer,
A... Vibration mechanism, B... Hammering mechanism, C...
...Sieve positioning mechanism.

Claims (1)

[Claims] 1. A vertical drive shaft provided on one of a pair of columns facing each other on a base, a vertical driven shaft provided on the other column, and eccentric means fixed to the upper and lower portions of both shafts, respectively; A vibration mechanism consisting of an upper arm fitted into an upper eccentric means and a vibration table provided on the lower eccentric means, and a sieve holder guided by two vertical rods connected to the upper arm and the vibration table and moved up and down by a cylinder. A multi-stage sieving device for powder and granular material, comprising a plate, a hammering mechanism for hitting the sieve holding plate with a hammer, and a sieve positioning mechanism installed upright from the base.