JPS6113107Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an electronic scale type weight sorting machine for fruits and vegetables.

In recent years, with the development of electronic technology, weighing machines using load cells have become popular, but the load cells themselves in these load cell type weighing machines have no moving parts, and the sensing part is equipped with a strain gauge (electrical resistance wire). The electrical resistance wire is also used in the pick-up part of the vibration meter, and is extremely sensitive to the vibrations of the mounting body, so it is not suitable for static weighing machines or tabletop weighing machines. It is suitable for use when the weighing pause time of approximately 1 second or more is required between loading the object to be weighed and the display, such as a platform scale, but when the bucket of a bucket and chain conveyor is running continuously, such as a weight sorter for fruits and vegetables. When weighing at a rate of 2.5 to 3 pieces per second, the pause time between loads is short, so the vibrations within the load cell body are not damped, and the vibrations affect the next load, causing a change in the weighed value. There was a drawback of large variations.

The present invention eliminates the above-mentioned drawbacks and improves weight measurement accuracy and measurement speed, and also has a bucket structure that allows fruit and vegetable to be fed at a predetermined feeding position.
It was developed to facilitate the automatic feeding of fruit and vegetables, and utilizes the fast response speed and high accuracy that are characteristic of load cell scales, and has a capacity of 2.5 to 2.5 per second.
In order to be able to weigh about 5 items, two load cell scales are installed, A and B, and correspondingly, the contact running portion of the weighing tray that continuously runs at equal intervals is adjusted to the above A and B for each load cell scale. The scale is alternately loaded (loaded) to lengthen the pause time between weighing loads, damping the vibration of the load cell body, and facilitating automatic feeding of fruits and vegetables to the weighing tray. In order to achieve this goal, the receiving portion of each weighing tray on which fruit and vegetables are placed is made concentric with the width direction perpendicular to the running direction of the chain.

Hereinafter, drawings showing an embodiment of the present invention will be described. 1 is a fruit sorting machine frame, 2 is a chain that runs and rotates endlessly, and weighing trays 3 are attached by stays 4 at predetermined intervals in the traveling direction to form a bucket chain conveyor. The receiving portion on the top of each weighing tray 3 on which the fruit side dish is placed is made concentric with the width direction perpendicular to the running direction of the chain, so that the fruit side dish can be fed from one predetermined position. A measurement pedestal 10, which will be described later, is located at the bottom of the weighing pedestal 3.
The contact traveling portions that contact and travel on the top are provided so as to be alternately offset one by one in the width direction. The weighing tray 3 and the chain 2 may be combined by the conventionally commonly used method of weight sorting machines, but if the weight of the fruit placed on the weighing tray 3 and the tray above it is The weighing pan 3 is loosely fitted to the mounting bracket 5 of the stay 4 so as to be able to move freely within a certain range forward and backward in the direction of travel and up and down so that measurements can be taken. 6 is a weighing device, and two load cell scales 7, A and B, are provided. Reference numeral 8 has a lever, 9 has a measuring pedestal 10 at the top, an oil damper 11 at the bottom for buffering the scale and absorbing vibrations, and a load cell 1.
It is a vertical link for weighing by applying a load to the ram 8, and is attached to the ram 8 with a fulcrum pin 13 so as to form a countersunk rod with a verbal structure. 14 is a weight pan, and 15 is a screw type minute adjustment weight, both of which are used to balance the lever 8 during idle operation. Reference numeral 16 denotes a stopper that restricts the movement of the lever 8. The upper protrusion maintains the horizontal position of the lever 8, and the lower protrusion protects the load cell 12 by preventing it from descending too much due to load sensitivity. 17
is a stable running rail attached to the upper part of the scale body, which receives the contact running part of the weighing tray 3 on the front side of the measuring pedestal 10 and smoothly transfers it onto the measuring pedestal 10, and a part of it is attached to the measuring cradle 10. Running rails 19 are formed parallel to the sides of the weighing tray 10, and the contact running parts of the weighing pans 3 that are not being weighed are received alternately one by one.

As shown in FIG. 3, the weighing device 6 of this embodiment is equipped with a roberbal mechanism consisting of a lever 8, a fulcrum pin 13, and a vertical link 9, and a weight pan 14 for balance on a scale body 18, and is small and high-performance. Although the load cell scale 7 is constructed by incorporating the load cell 12 in the explanation, it is possible to use a Roberval type load cell in which the lever 8 does not have a movable link mechanism such as the fulcrum pin 13, and the load cell itself has upper and lower parallel beams formed in one piece. A measurement pedestal 10 may be attached to this to constitute a load cell scale.

The weighing tray 3 has a, b, a, b as shown in Fig. 3.
As shown in FIGS. 4 and 5, the receiving parts a and b on which fruits and side dishes are placed are concentric in the width direction perpendicular to the running direction.
The contact running parts running in contact with each other on the top are offset from each other in the width direction, and the measurement pedestals 10A and 10B are also offset from each other in the width direction in response to the deviation of the contact running parts a and b, respectively. ing. In this way, a and b of the weighing tray 3 are the same as A and b of the load cell scale 7 of the weighing device 6,
B, and in combinations a and A, and b and B, the contact running portion of the weighing tray 3 is connected to the measuring tray 10, respectively.
Since the vehicle travels over points A and 10B, its weight is measured at that time [Figure 4 A, Figure 5 I].

Next, b and A [Figure 4 B], a and B [Figure 5 B]
In the above combination, the contact running portion of the weighing tray 3 does not ride on (does not contact) the measuring pedestal 10 but passes on the side running rail 19, so no measurement is taken. As described above, the measurement pedestal 10 of the load cell scale 7 and the contact running portion combined therewith are arranged in rows A, a and rows B, b, and weighing and measurement are performed alternately one by one. Therefore, even if the weighing pan 3 travels at high speed, the load cell scale can rest for a long time, and during that time the vibrations of the lever 8 and the load cell 12 body are sufficiently damped and do not affect the next weighing.

Note that although A and B of the load cell scale 7 are illustrated and explained as being placed front and back with respect to the traveling direction, 2
It is also possible to change the structure of the individual load cell scales so that they are arranged side by side in a direction perpendicular to the direction of travel at the same location with respect to the direction of travel.

Next, Fig. 6 shows the output signal of the load cell read on an oscillograph when a large number of equally spaced weighing pans are continuously weighed with one load cell weighing machine, and P is the installation interval of the weighing pans ( Pitzchi), W ₁
is during weighing (when a load is applied), and W ₀ indicates when no load is applied in the space between the weighing pan and the weighing pan, that is, at rest. As can be seen from this graph, the signal fluctuation during weighing is large, and even at the end point C of weighing, the level of the load (indicating weight) is not stable. This is because the vibrations are not attenuated at the end point D during rest, and the next load is not applied again, so the vibrations are amplified, and the conventional situation was that good accuracy could not be obtained.

Figure 7 shows the load cell scales A and B of the present invention used to attach the weighing trays 3 to a and b alternately at equal intervals, and the two scales to alternately weigh at the same speed as that shown in Figure 6. The output signals of each load cell are read on an oscilloscope when
During weighing, W ₀ indicates weighing pause (no load).
Wb indicates that scale B is weighing, W ₀ indicates that scale B is not weighing, and if you combine A and B in Figure 7, the total is 6.
Weighing is performed at the same intervals (pitch) as shown in the figure, but as you can see from the figure, the load cell is stable at almost zero load at the end points F and H of the weighing pause, so there is no load fluctuation (vibration) during weighing. The level indicating the weighing value at E and G at the end of weighing is stable, indicating that the weighing accuracy has been improved. This shows that even if the traveling speed of the weighing tray 3 is increased, high weighing accuracy can be obtained.

As described above, the present invention uses two load cell scales to alternately weigh each weighing pan, so even if the weighing pans run at high speeds, the load cell scale can take a long rest time. The scale becomes stable,
In addition to being able to perform high-speed and highly accurate weighing, since the receiving portions of each weighing tray on which fruit side dishes are placed are concentric in the width direction, fruit side dishes can be fed at one predetermined supply position. Since automatic feeding can be easily performed, it has a great effect on rationalizing fruit sorting facilities for fruit and vegetables.

[Brief explanation of the drawing]

Fig. 1 is an overall plan view of a fruit sorting machine showing an embodiment of the present invention, Fig. 2 is a schematic side view of Fig. 1, Fig. 3 is a side view of the main part of a weighing device based on the present invention, and Fig. 4 is a schematic side view of Fig. 1. Third
Figure 5 is a schematic cross-sectional view taken along the line X-X. is a schematic cross-sectional view taken along Y-Y line in Figure 3,
A shows the state when the weighing pan b is in the measuring section of the load cell scale B, and B shows the state when the weighing pan a is in the measuring section of the load cell scale B. FIG. 6 is a graph showing the output signal of a conventional load cell scale, and FIG. 7 is a graph showing the output signal of the load cell scale based on the present invention, where A is load cell scale A and B is load cell scale B. 1... Fruit sorting machine frame, 2... Chain, 3...
Weighing pan, 4... Stay, 5... Mounting bracket, 6...
...Weighing device, 7... Load cell scale, 8... Ram rod,
9... Vertical link, 10... Measurement pedestal, 11...
Oil damper, 12... Load cell, 13...
Fulcrum pin, 14...Weight plate, 15...Screw type minute adjustment weight, 16...Stopper, 17...Stable running rail, 18...Weigher body, 19...Travel rail.

Claims (1)

[Scope of Claim for Utility Model Registration] A large number of weighing trays are attached at equal intervals to an endless chain that is stretched in multiple strips and runs and rotates, and a fruit dish is placed on the weighing trays and its weight is weighed together with the weighing trays, In a weight sorting machine for classifying classes, two load cell scales are provided as weighing devices, and the positions of the measurement pedestals provided on each of the two load cell scales in the width direction perpendicular to the running direction of the chain are different from each other. On the other hand, each of the weighing trays has a receiving portion concentric in the width direction at the upper portion thereof, and a contact traveling portion at the lower portion that runs in contact with one of the two measuring trays. The contact running parts are arranged so as to be alternately offset one by one in the width direction, and the contact running parts of the weighing pans are alternately shifted one by one on the measurement pedestals of the two load cell scales. An alternate weighing system for fruit and snacks, characterized in that the fruit and snacks are configured to travel in contact, and the weight of the fruit and snacks supplied onto the receiving portion of each weighing tray is weighed by each load cell scale and sorted and sorted. Weight sorting machine.