JPS5860224A - Method and apparatus for measurement which shorten falling distance of inputted material - Google Patents

Abstract

PURPOSE:To improve measuring accuracy by providing an intermediate part opening type measuring plate in a measuring container, and shortening the falling distance to a measuring table. CONSTITUTION:A powder body M3' is discharged from a small discharge port on an opening or discharging gate 42 in a supplying device 41, and accumulated on the intermediate part opening type measuring plate 46. Then the accumulated weight is measured. In this case, the falling distance h12 is extremently smaller than the falling distance h11 to an opening type measuring table 49. The powder body M3'', which is measured by the intermediate part opening type measuring plate 46, passes the opening type measuring table 49' whose lower part is opened, by the opening 46' of the intermediate part opening type measuring plate after the measurement. Then the powder body is supplied to bag packing devices 60 and 61 in the next process which are provided at the lower position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for shortening the input head of granules and a measuring device therefor.

It goes without saying that originally, when an object to be weighed is placed on a weighing platform during measurement using a weighing device, a measured value greater than the actual weight is detected due to the influence of acceleration. To prevent this, reduce the influence of acceleration as much as possible.
In other words, the head difference should be made as small as possible.

However, as shown in FIG. 1, there is a certain gap between the feeding device 1 and the weighing platform 3 in the weighing device 2 due to its structure, equipment arrangement, and work operation. It is unavoidable to provide a head of However, in recent years, as various circumstances have become more severe, measurement precision has become more demanding, and the influence of acceleration mentioned above has been reconsidered.

Various measures have been taken to counter this problem, some of which are listed below.

That-. As seen in FIG. 2, a baffle plate 9 in the form of a canopy was provided between the supply device 5 and the metering device 6, and was attached to the tip of the arm 8, the other end of which was fixed to the pedestal 7. Powder M1' falling from the supply port 5a
This is a method in which the movement of the material is temporarily stopped by this baffle plate 9, the speed is slowed down, and then it continues to flow down along the slope, falling by a head h3 from the baffle plate, and is thrown onto the weighing table 7. . This method shortens the head from h2 from the feeding device to the weighing platform to h3 above, although it is a small amount as seen in the figure, it is a method that is widely used because of its simplicity. be.

Part two. As shown in FIG. 3, a relatively small second supply device 15 is provided in the upper part of the measuring container 12, and
Adjustment screw 18 from the fixed beam 14 (on the pedestal 19)
It has a suspended structure. This can be adjusted in height up and down, and the head from the second feeding device 15 to the weighing platform 13 is relatively significantly reduced compared to the head h4 from the existing main feeding device 11. shall be done;
Although the effect is great, various restrictions are imposed on the work of storing the measuring container 12 inside the existing measuring container 12, and there is a drawback that the practical scope is limited.

Part three. As seen in FIG. 4, one or two chutes 25, 26 are housed in the upper part of the weighing container 22 in the shape of a lightning bolt, and they are connected to the adjusting screw 28 from the fixed beam 23 (on the pedestal 27). It is of a structure suspended by 29 degrees. This allows you to adjust the vertical height and position as well as the angle of inclination of the chute. As seen in the figure, the head is also very short to "h7'," but as in the case of Section 1 and Part 2, there are many problems in housing these multiple chutes in the weighing container. It is not very popular.

The above are some examples of currently available adjustment devices that shorten the head from the generally known feeding device to the weighing platform inside the weighing container. Four falling intermediate stellas were installed in the system, and their installation was naturally related to the structure of the weighing device, and due to these constraints, the range of use was extremely limited.

An object of the present invention is to further shorten the head from the feeding device to the weighing platform by providing an intermediate closed weighing plate in the weighing container of the weighing device, thereby increasing weighing accuracy, and improving installation, operation and maintenance. The object of the present invention is to provide a method and device for easy management.

The gist of the present invention is to provide a method for reducing the drop of powder and granular material from a feeding device by providing an intermediate open/close type weighing plate above the weighing platform in a weighing device measuring container, and a method for reducing the height of the intermediate open/close type weighing plate. The structure is such that the position can be easily adjusted.

As shown in FIG. 5, the method of the present invention further provides an intermediate opening/closing type weighing plate 35 above the weighing platform 34 to shorten the head from the feeding device 31 above it (from ha to ho). This is a method of carrying out cumulative weighing using a weighing stand and an intermediate weighing plate that can be opened and closed. There are three ways to measure it:

■ All the objects to be weighed in the batch fed from the supply device 31 are received and weighed on the intermediate opening/closing type weighing plate 35, and after weighing, the intermediate opening/closing type weighing plate is opened and placed in the hopper 40 in the device below. Drop it on. At this time, the weighing platform 34 is opened (3
4') has been done.

The inherent advantage is that the head from the supply device 31 is h9, which is much shorter than the head from the weighing platform 34 h8.

■ In the multi-stage charging method, in the first stage, the intermediate opening/closing weighing plate 46' (Fig. 6C) is opened and the input from the feeding device is directly input onto the weighing table 49 for measurement, and as the latter stage reaches, the above-mentioned, intermediate The opening/closing weighing plate 46 is closed, and the weighing is carried out on the intermediate opening/closing weighing plate, and the weight on the weighing stand loaded in the previous stage is integrated and weighed to a set value.

Note: The multi-stage charging method is a method in which the input is divided into multiple stages, with a large amount being added at the beginning and a smaller amount as it goes to the later stages. For example, in the three-stage charging method, the first stage is reduced to 50-60% of the predetermined amount, the second stage is reduced to 45-35%, and the third stage is reduced to 5%. Needless to say, the purpose is to minimize errors in the measuring device.

The advantage of this method is that a large amount can be added in a short time within a range that is not affected by acceleration, and the remaining amount can be added in small amounts at a time, and an intermediate opening/closing weighing plate is used to reduce the effect of acceleration. It is used.

■ For objects to be weighed that are continuously fed from the feeding device,
The intermediate opening/closing weighing plate is opened and closed once during the loading time, and the weighing plate is loaded into the weighing table and weighed.

The advantages of this method are: - It is suitable when the batch size is large and the multi-stage charging method cannot be applied.

Next, the apparatus of the present invention will be explained. As can be seen in FIG. 6A, in general, a supply bag #41 is placed above the measuring device for powder and granules, and a bagging device 60 is placed below the measuring device.
61 etc. are usually arranged. The measuring device in the figure shows a cantilever-suspended piezoelectric measuring device. That is, a weighing container 44 and an open/close type weighing platform 49 are mounted on the bottom thereof, and a pedestal 55 fixed on the ground is elastically supported by an elastic plate 56 on one side of the weighing container, and a weighing container 44 is supported elastically by an elastic plate 56, and a weighing platform 49 is mounted on the bottom of the weighing container 44. This is a measuring device that uses a piezoelectric device 59 to detect the vertical fluctuation due to the weight when the weight is moved, and the fluctuation of the force generated between the arms 57 and 58 provided on the fluctuation side and the fixed side. For such a known measuring device, the measuring container 4
The weighing device according to the present invention further includes an intermediate opening/closing weighing plate 45 inside the weighing table 4 and above the opening/closing weighing table 49 (hp). Both of the opening/closing weighing platform 49 and the intermediate opening/closing weighing plate 45 are operated by air cylinders 48.52, and the opening/closing frame 46. If a shock absorber 47, 51 is provided between the 50 and the 50, and cushion sheets 53 and 54 are attached to the base surfaces of the openable weighing platform 49 and the intermediate openable weighing plate 45, it is possible to further reduce the load. The effect of acceleration is alleviated.

Next, the operation of this device will be explained. The description will be made according to the three terms described in the section of the method of the present invention above.

■ When using only an intermediate opening/closing weighing platform - see Figure 6B. The weight of the material placed and accumulated on the waste 46 of the supply device 41 is measured. In that case, the head h12 is much smaller than the head h11 at the opening/closing weighing platform 49''!i.The powder M3'' weighed by the intermediate opening/closing weighing plate 46 as described above When the intermediate opening/closing weighing plate is opened (46'), it passes through the opening/closing weighing platform 49' which is open at the bottom, and the bagging equipment 60, 61, etc. for the next process installed below it passes through the opening/closing weighing platform 49' which is open at the bottom. supplied to

■ In the case of the three-stage loading method: The opening/closing weighing platform 49 of the weighing device is closed, and the intermediate opening/closing weighing plate 46 is open (46') (first stage, see Figure 6C).
Then, the discharge gate of the supply device 41 is fully opened (42') and the powder M3 is discharged (M3') and placed on the open/close type weighing table 49.
When 50 to 60% of the desired measured value is detected (M3), the intermediate opening/closing weighing plate 46 is closed (second stage,
At the same time, the discharge gate 42 is half-opened to discharge 45 to 35% of the liquid, and when it is placed on the intermediate opening/closing weighing plate 46 (see part of Figure 6D in the third stage), Close the discharge gate 42, position the small discharge port 42a, and (42') discharge and input the remaining 5% through the small discharge port. In other words, M3' of the powder and granular material is measured separately on the opening/closing weighing platform, M and rr/ are measured separately on the intermediate weighing plate, and the sum of these is measured comprehensively by the weighing device. After that, the downward discharge is carried out at the same time (6th
Figure E). As is clear from the above drawings, the head difference h11 is relatively large in the first stage, but this is at a stage before weighing and is not related to the influence of acceleration, and in the second and third stages. Since the head h12 is reduced, the influence of the head is also reduced, and the error in the final value of measurement is also reduced.

■ When opening and closing the intermediate opening/closing type weighing plate several times: Please refer to Figure 6F. In the martial arts technique, the powder and granular materials M,' that are continuously fed from the supply device 41 are once received on the intermediate opening/closing type weighing plate 46 (the four M's are repeatedly opened and closed several times, and In this method, the sample is placed on the open/close type weighing platform 49, and after reaching a predetermined weighing value (M4'''), the open/close type weighing platform is opened and supplied to the device below.

The head from the supply device 41 to the opening/closing weighing platform is divided into sonic parts (h+s, hn). In addition, there are several other mechanisms for installing the intermediate opening/closing weighing board as described above. Examples include formats.

That-. See Figure 7. The height h15 of the intermediate opening/closing weighing plate 64 from the opening/closing weighing stand 68 is determined by screws 67 and nuts 66.
It can be adjusted up and down steplessly by this action.

Part two. See Figure 8. The height h16 of the intermediate opening/closing weighing plate 73 from the opening/closing weighing stand 76 can be changed in stages, and the determination of their positions is determined by the weighing container 71.
This is achieved by providing bearings 75A, 75B, and 75C for the opening/closing shafts on the side plates of , and the adjustment work therefor is more complicated than that for the above.

Part three. See Figure 9. Inclination angle variable shaft 8 of chute 82
3 is provided on the upper edge of the measuring container, and the inclination angle of the chute is changed by an air cylinder 85 or a manual screw nut (not shown).

As described above, by using the method and device of the present invention for shortening the fall of the powder or granular material from the feeding device to the measuring device, the falling speed due to the acceleration of the powder or granular material can be reduced, and the detection of measured values can be made more accurate. As a result, measurement errors can be further reduced, and at the same time, these devices can be made compact and easy to handle and maintain.

[Brief explanation of the drawing]

Fig. 1 is a side view of the installation of a conventional general weighing device and a feeding device. Fig. 2 is a “method” of shortening the head from the conventional feeding device to the weighing platform of the weighing device. Fig. 3 is the same. “Part 2” Figure 4 is the same as “Part 3” Figure 5.
Figure 6A is an explanatory diagram of a method for reducing the head difference from the supply device to the weighing platform of the weighing device according to the present invention. Figure 6A is an illustration of a method for reducing the head difference from the feeding device to the weighing platform of the weighing device according to the present invention. Fig. 6B is an explanatory diagram of the case where only the intermediate opening/closing type weighing plate is used. Fig. 6C is a side sectional view of the measuring device according to the present invention. FIG. 6D is an explanatory diagram of the first stage in the case of the three-stage charging method. FIG. 6E is an explanatory diagram of the discharging method. FIG. 6F is the use of the metering device according to the present invention. ■An explanatory diagram of the case where the intermediate opening/closing type weighing plate is opened and closed several times in the method. Figure 7 is a diagram of the installation structure of the intermediate opening/closing type weighing plate provided in the weighing container according to the present invention. Part 2" Figure 9 is the same as "Part 3" Explanation of main symbols 1.5, 11, 21. 31. 41... Feeding device 2゜6.12, 22, 33, 44, 62, 71.8
1...Measuring container, 3, 7, 13, 24, 34,
49.68, 76.88 ...Openable weighing platform
10, 19.27, 38.55 ...Fixed frame 32.42 ...Discharge gate 35゜46
．． 64.73...Intermediate opening/closing weighing plate 36,3
Air cylinder for 7゜43, 48.52.85 3
9゜59・・・Piezoelectric detector 18.28,2
9.67... Vertical adjustment screws 75A, 75B
, 75C... Bearing 25, 26. 82... River/Angle Variable Chute Patent Applicant Doughboy Co., Ltd. Figure 1

Claims (1)

[Claims] 1) In the process of feeding powder and granular material from the supply device to the measuring device, the head difference from the supply device is reduced by providing an intermediate opening/closing type weighing plate above the weighing table in the weighing container. A measuring method for reducing the head difference of input materials. 2) In a measuring device for powder and granular material fed from a supply device, an intermediate opening/closing weighing plate 45 is provided above an opening/closing weighing platform 49 located at the bottom of a weighing container 44 (FIG. 6A). A measuring device that reduces the head difference of input materials. 3) The "intermediate opening/closing type weighing plate 45" described in claim 2) is vertically adjustable. 4) Single opening/closing weighing platform 49 as described in claim 2)
” and “intermediate opening/closing weighing plate 45” are the opening/closing rods 4.
Shock absorbers 47 and 51 are provided between 6A and 50 and the respective air cylinders 48 and 52. 5) The "opening and closing type weighing platform 49" described in claims 2) and 4) and the "intermediate opening and closing type weighing plate 45" described in 2) and 3) and 4), On each stand, there is a sticker/notion sheet 53°54 affixed.