JPS6327072B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weighing and sorting device that weighs and sorts objects to be weighed (hereinafter referred to as "works") one by one.

Conventional equipment that weighs a large number of workpieces (for example, tablets) one by one and sorts them into those with a weight within an acceptable range and those with weights outside of the allowable range, feeds the workpieces from a hopper into multiple spiral pipes. Workpieces were lowered one by one while slightly vibrating the pipe, and the workpieces were discharged onto a scale installed at the outlet of the pipe for weighing and sorting.

However, with this device, the weighing and sorting work is inefficient, and the work is complicated as the pipes must be replaced depending on the type and size of the workpiece.
Another drawback was that the tablets contact and wear against the inner wall of the pipe as they move down the pipe due to the slight vibrations of the pipe.

The object of the present invention is to correct such drawbacks and provide a weighing and sorting device that can weigh and sort a large amount of workpieces extremely efficiently.

For this purpose, in the present invention, the workpieces are fed onto the rotary plate, and while the rotary plate is rotated, the workpieces are sucked one by one into the holes of the rotary suction device, and then transferred from the rotary plate to the scale for weighing and sorting. It is characterized by the fact that

An embodiment of the invention shown in the drawings will be described below.

In FIG. 1, 11 is a hopper, and the hopper 11 has a vibrator 12 that gives slight vibrations.
A large number of works (tablets) W in the hopper 11 are moved around the peripheral edge 13 of the lower rotary plate 13 in response to vibrations given by the vibrator 12.
It falls in the area around a. As shown in FIG. 3, the rotating plate 13 is fixed to a rotating cylinder 15 rotatably attached to a vertical fixed shaft 14. The rotating cylinder 15 is rotationally driven in a counterclockwise direction by a motor (not shown). The rotating plate 13 has a circular flat plate shape, and a plurality of concentric grooves 16 are carved in the peripheral edge 13a of the upper surface thereof, as shown in FIG.

To prevent the workpiece W from falling outward from the peripheral edge 13a of the rotary plate 13, the peripheral frame 17 is attached to the rotary plate 13.
is located outside.

Rods 19, 19 are attached horizontally to the head 18 attached to the upper end of the fixed shaft 14, intersecting each other in a cross shape, and both ends of the rods 19, 19 are attached to the outer frame 17.
is fixed.

A transparent flat plate 20 is horizontally attached to the rods 19, 19, which are horizontally installed above the rotary plate 13 in this manner. The flat plate 20 has a substantially semicircular shape so as not to prevent the workpiece W from falling from the hopper 11 onto the rotary plate 13.

On the lower surface of the flat plate 20, there is a workpiece W on the rotary plate 13.
are in contact with each other due to the rotation of the rotary plate 13, and the peripheral edge portion 13
A plurality of work guides 21
are installed vertically at appropriate intervals. A distance smaller than the height of one workpiece is formed between the lower end surfaces of these workpiece guides 21 and the upper surface of the rotary plate 13.

The first and second work guides 21a and 21b are
As shown in FIG.
It has an arcuate shape that is curved in the rotational direction of the rotary plate 13 up to the vicinity of 3a.

The third to sixth work guides 21c to 21f have an arcuate shape that curves in the rotational direction of the rotary plate 13 from the semicircular peripheral edge 20a of the flat plate 20 to the vicinity of the peripheral edge 13a of the rotary plate 13.

First and second level detectors 22 are located on the sides of the first and second work guides 21a and 21b.
a and 22b are fixed to the flat plate 20. The level detectors 22a and 22b are arranged so that the workpiece W is the first one,
It has a pendulum plate (not shown) that is tiltably vertically disposed so as to come into contact with a certain amount or more of workpieces W that accumulate in the vicinity of the second workpiece guides 21a and 21b. The level detectors 22a and 22b detect whether or not the inclination angle of the plate is a certain angle or more.
3 detects the amount of work W supplied from the hopper 11, and controls the operation of the vibrator 12 provided on the bottom surface of the hopper based on the signals from the level detectors 22a and 22b, and transfers the workpiece W from the hopper 11 to the rotary plate 13. The amount of workpiece supplied is now adjusted.

The work W dropped and supplied from the hopper 11 moves counterclockwise with the rotation of the rotary plate 13, and first moves along the second work guide 21b to the peripheral edge 13.
However, in order to prevent a large amount of work W from accumulating on the peripheral edge 13a and causing a bridge condition, an eccentric rotating roller 24 is rotatably installed vertically on the lower surface of the flat plate 20, and is guided by a motor 24a. It is rotated counterclockwise or clockwise. Further, on the side of the eccentric rotating roller 24, a double stacking prevention plate 25 is provided on a flat plate to prevent the workpieces W which are stacked in two levels from passing between the peripheral frame 17 and the eccentric rotating roller 24. It is installed vertically on the lower surface of 20.

A plurality of rotary suction devices 30 are installed along the peripheral edge 13a of the rotary plate 13 at appropriate intervals.

2 to 5 show this rotary suction device 30, in which a fixed shaft 33 having a vacuum passage 31 and an air jet passage 32 in the center is installed vertically near the outer side of the rotary plate 13. A rotary cylinder 35 having a cylindrical flange 34 at the upper end is rotatably fitted from above to the fixed shaft 33, and a part of the flange 34 rotates as shown in FIGS. Periphery 13 of plate 13
It is in a state of being overhanging upwards on the a side.

As shown in FIGS. 4 and 5, the flange portion 34 of the rotating cylinder 35 is a circular hollow portion 36 having a larger diameter than the fixed shaft 33.
A plurality of passages 3 are connected to a plurality of holes 37 formed at equal intervals on the peripheral end surface 34a of the collar portion 34.
8 are formed radially from the hollow part 36.

From above this rotating cylinder 35, a cylindrical cap cylinder 40 is attached to the fixed shaft 33 with pins 41 and vertical grooves 42.
It is fitted in such a way that it cannot rotate. A tightening screw 43 is inserted into the fixed shaft 3 from above the cap cylinder 40.
3 is screwed into a screw hole 44 at the upper end. This cap cylinder 40 has a semi-cylindrical protrusion 4 on the lower center surface that fits into the circular hollow part 36 of the flange 34.
5, and this protruding portion 45 is fitted into the hollow portion 36. The protruding portion 45 is provided with a passage 46 that penetrates in the horizontal direction, and this passage 46 is connected to the hole 3 of the air jet passage 32 of the fixed shaft 33.
2a. Also, Bakyum passage 31
The hole 31a is located on the opposite side of the protrusion 45.

A compression spring 47 is fitted into the lower part of the rotary cylinder 35, so that the installation height of the rotary cylinder 35 can be adjusted by adjusting the degree of tightening of the tightening screw 43.

All rotating cylinders 35 are rotated clockwise at the same speed by the same driving source. And tsuba part 34
The circumferential speed of the circumferential end surface 34a is set to be slightly higher than the circumferential speed of the rotating plate 13 at the same position.

A scraping plate 48 for scraping off the workpiece W attracted to the hole 37 is vertically provided at the peripheral end of the cap cylinder 40 up to the lower end of the collar 34 of the rotary cylinder 35. Below the scraping plate 48 is a scale 50.
is provided. As a removal device for removing the workpiece W weighed by this scale 50 from the scale 50,
An air nozzle 51 is provided near the scale 50.

Further, a gate 52 that is movable in the vertical direction is provided between the scale 50 and the rotary plate 13. This gate 52 is normally in the state shown in FIG. 2b, but
During zero point correction of the scale 50 or when an abnormality occurs in the scale 50, the scale 50 rises as shown in FIG.
3.It has the role of scraping it upwards. That is, scale 5
At 0, the abrasion powder of the scraped workpiece W gradually accumulates, so the zero point shifts. Therefore, the gate 52 is raised every predetermined number of times the workpieces W are counted to prevent the workpieces W from being placed on the scale 50. The zero point is corrected. Also gate 5
2 is raised to prevent the workpiece W from being placed on the scale 50 when an abnormality occurs in the scale 50, for example, when a certain number or more of NGs occur consecutively.

A sorting gate 53 is provided in the discharge direction by the air nozzle 51, and if the weight is within the allowable range according to the weighing result, the sorting gate 53 is disposed.
If the OK chute 54 is not blocked and the weight is other than that, the OK chute 54 is blocked and the weight is guided to the NG chute 55.

Next, the operation of the weighing and sorting device of the above embodiment will be explained.

The workpiece W in the hopper 11 is moved by the vibrator 12
It falls onto the rotating plate 13 due to the slight vibration caused by the vibration. The work W that has fallen onto the rotary plate 13 rotates as the rotary plate 13 rotates, but first the second work guide 21
b and is guided toward the peripheral edge 13a of the rotary plate 13. At this time, if a large number of workpieces W are stacked on top of each other, the workpieces W stacked in two or more levels will come into contact with the pendulum plate of the second level detector 22b, so the pendulum plate will be inclined at a certain angle. When the value exceeds the level, the operation of the vibrator 12 is stopped by the output of the level detector, and the supply of the workpiece W from the hopper 11 is stopped.

An eccentric rotating roller 24 is rotating at the tip of the second work guide 21b. Therefore, the surrounding frame 1
Since the distance between the roller 7 and the roller 24 constantly changes, the occurrence of bridging of the workpiece W is prevented. Work W
rotates together with the rotating plate 13 whose double stacking is released by the double stacking prevention plate 25.

The rotating cylinder 35 is rotated with the collar 34 of the rotating cylinder 35 projecting from the peripheral edge 13a of the rotating plate 13. The hole 37 in the circumferential end surface 34a of the flange 34 communicates with the space S defined by the protruding part 45 of the cap cylinder 40 and the hollow part 36 of the flange 34 on the rotary plate 13 side, so that it cannot be fixed. It communicates with the vacuum passage 31 of the shaft 33 for suction. On the other hand, rotating plate 1
3, the hole 37 connects to the passage 4 of the protrusion 45 that communicates with the air jet passage 32.
6 and blows out air. Therefore, since the flange 34 of the rotary cylinder 35 is rotating as if inserted into a large amount of work W on the peripheral edge 13a of the rotary plate 13, the hole 37 in the peripheral end surface 34a of the flange 34 is rotated.
The workpiece W on the rotating plate 13 is attracted and carried away from the rotating plate 13, which rotates together with the flange 34, while being attracted.

The work W that is not attracted is pushed away by the flange 34, but the next work guide 21d~
21f again toward the peripheral edge 13a of the rotary plate 13, and is given successive opportunities for adsorption.

Note that the workpiece W pushed further toward the center than the workpiece guides 21c to 21f is guided toward the peripheral edge 13a again by the first workpiece guide 21a. The amount of the work W is also detected by the level detector 22a near the first work guide 21a, and if it is too large, the supply from the hopper 11 is stopped.

Note that even if two workpieces W try to be attracted to one hole 37 of the collar portion 34 at the same time, only one workpiece W will be attracted because the groove 16 disrupts the balance of the attraction force to the two workpieces W.

The work W attracted to the hole 37 is sequentially scraped onto the scale 50 by the scraping plate 48. After the weighing is completed by the scale 50, the air nozzle 51 blows the air down, and those within the acceptable range according to the weighing results are discharged to the OK chute 54, and the others are rejected by the action of the sorting gate 53. It is discharged into the chute 55. Air is blown outward from the hole 37 of the flange 34 once during one rotation, and powder of the work W (tablet) is prevented from accumulating in the hole 37 . Moreover, since the powder of the workpiece W gradually accumulates on the scale 50 as a large number of powders are weighed, the gate 52 is raised every time a certain number of powders are weighed. Therefore, the workpiece W attracted to the hole 37 is
It is scraped onto the peripheral edge 13a of the rotary plate 13 and rotates together with the rotary plate 13. Then, the workpiece W is weighed without being placed on it, and zero point correction is performed each time.

Incidentally, instead of providing the scraping plate 48, the hole 37 may be made not to communicate with the vacuum passage 31 at this position. Furthermore, instead of providing the gate 52, the vacuum may be temporarily stopped every time a predetermined number of works W are weighed.

In the above embodiment, the weighing and sorting of tablets was explained as an example, but it goes without saying that the present invention can be applied to other works than tablets.

As explained above, in the weighing and sorting device of the present invention, a large amount of workpieces W are rotated by the rotary plate 13 and sequentially sucked by the rotary suction device for weighing and sorting, so that the weighing and sorting work becomes much more efficient. , and the work W will not be destroyed. Further, since it is only necessary to change the mounting height of the rotary cylinder 15 according to the type of workpiece, troublesome replacement work is unnecessary.

In addition, level detectors 22a and 22b are provided to control the supply amount of the workpieces, a rotating body for preventing bridging is provided to break the bridging of the workpieces, and a double stacking prevention plate 25 is used to prevent rotational suction. device 30
Since the workpieces reach each other without overlapping each other, the workpieces can be suctioned and rotated one by one smoothly.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing an embodiment of the weighing and sorting device according to the present invention, Fig. 2a is a plan view showing main parts of the embodiment shown in Fig. 1, Fig. 2b, c is a side view of the main part showing the operation of the gate 52;
Fig. 3 is a sectional view showing the main parts of the embodiment shown in Fig. 1, Fig. 4 is an exploded perspective view showing the main parts of the rotary suction device, and Fig. 5 is a cross-sectional view showing the main parts of the embodiment shown in Fig. 3. It is an enlarged sectional view. DESCRIPTION OF SYMBOLS 11... Hopper, 13... Rotating plate, 13a... Peripheral part, 16... Groove, 17... Peripheral frame, 19... Rod body, 20...
Flat plate, 21... Work guide, 22... Level detector, 24... Eccentric rotating roller, 25... Double stacking prevention plate, 30... Rotating suction device, 31... Vacuum passage, 32... Air jetting passage, 33... Fixed shaft, 34
...Flame part, 35...Rotating cylinder body, 36...Hollow part, 37...
Hole, 38... Passage, 40... Cap cylinder, 43... Tightening screw, 45... Protrusion, 46... Passage, 48... Scraping plate, 50... Scale, 51... Air nozzle.

Claims (1)

[Scope of Claims] 1. A rotary plate that rotates with a workpiece supplied from a hopper placed thereon; and the workpiece placed on the rotary plate comes into contact with the rotational plate and reaches the peripheral edge of the rotary plate. A plurality of workpiece guides are installed vertically from above the rotary plate so as to be guided; A level detector is provided to limit the amount of workpiece supplied, and a level detector is installed near the tip of the work guide in order to break up the bridge-like accumulation of workpieces between the tip of the work guide on the rotary plate periphery side and the rotary plate periphery. a rotating body for preventing bridging; a scale disposed near the outer periphery of the rotating plate; a scale arranged near the outer periphery of the rotating plate, rotating in the opposite direction to the rotating plate; a rotary suction device that vacuum-chucks the workpieces and rotationally transfers them to the scale; and a double-stack prevention body for breaking the double-stacked state of the workpieces, which is provided above the rotary plate behind the bridging prevention rotary body. A weighing and sorting device, comprising: a removal device that removes the workpieces weighed by the scale from the scale; and a sorting gate that sorts the workpieces removed by the removal device according to the weighing results.