JPS6360845B2 - - Google Patents

Description

[Detailed description of the invention] The present invention transports fruits and vegetables one by one on a bucket conveyor, weighs the fruit and vegetables for each bucket during transportation, and calculates the weight of each bucket based on the weighing results. This invention relates to a measuring device for a weight sorter that classifies fruits and vegetables.

Conventionally, fruit and vegetable weight sorting machines have a chain that runs and rotates endlessly, and a large number of scales with saucers equipped with a roberval mechanism are attached at equal intervals to form a bucket conveyor, and the sorting is carried out on the side of the route of the bucket. For each class, for example, 3L, 2L, L,
For example, M, S, 2S, and 3S, a lever scale is installed to be fixed at each discharge position, and the set weight is set differently for each sorting class, depending on the balance between the lever scale and the scale with a saucer on which the fruits and vegetables are placed. A type of bucket that sorts fruits and vegetables and a bucket that has a Roberval mechanism on the mounting frame of the saucer itself are attached to a mounting bracket provided between two chains to form a towed bucket conveyor. The bucket is moved above the scales for each class that are fixed at the respective discharge positions, and the bucket is lowered depending on the balance between the scales with different set weights for each class and the bucket loaded with fruits and vegetables. Generally, a method is used in which fruits and vegetables are sorted by sinking and hanging. However, these conventional weighing mechanisms consisting of a bucket and a fixed lever scale have a large number of links and fulcrums because the tray on which the fruit and vegetables are placed is attached by a roberbal mechanism, and the resistance of each contact part is high. Since the sensitivity differs for each bucket, it takes a lot of effort to adjust the sensitivity of hundreds of buckets and 6 to 8 fixed hammer scales for each class to uniform sensitivity with one weight sorter. Because of this, they tend to be used without sufficient adjustment, and insufficient adjustment can sometimes result in poor sorting.

In addition, in the conventional weighing mechanism described above, the tongue piece fixed to a part of the bucket attached to the chain slides on the measuring rail of the fixed hammer rod scale. The drawback was that highly accurate measurement was not possible due to the effects of chain vibration.
Furthermore, conventional bucket carts and fixed ram and rod scales have the drawback of having complex structures and being prone to failure.

Furthermore, weighing machines and the like that use electronic weighing machines to weigh articles that are separated and transported one by one are generally known. There are two methods: one is a belt conveyor and the other is a method in which the item is weighed on the conveyor, or the other is a method in which the item to be weighed is temporarily stopped on a measuring pedestal.
Since the conveyor is used as the measurement pedestal, the length of the measurement pedestal is long, and the structure of the measurement pedestal is complex and its components are heavy, so there is a limit to the response speed of the rod, and it is difficult to measure more than 2 rods per second. Its high speed had the disadvantage that it could not be measured. Furthermore, the former method has the disadvantage that highly accurate weighing cannot be performed because the vibrations caused by the rotation of the conveyor belt affect the scale. The latter had the disadvantage that it was not possible to weigh at a high speed because the article to be weighed was temporarily stopped.

In addition, with these electronic weighing machines that are commonly used in the past, as shown in Figure 1, the output waveform is large and has a large wave amplitude, so the It is necessary to read the load at a stable level, which has the disadvantage that it is not possible to measure at high speed, and when trying to measure at high speed, sometimes it is detected at the crest of the vibration wave and sometimes at the trough. As a result, there was a drawback that measurement accuracy deteriorated.

The present invention was made to eliminate these drawbacks.In recent years, with the development of weighing devices that apply electronic engineering, weighing devices have become capable of weighing over a wide range with extremely small displacements of the measuring pedestal. Taking advantage of this, we simplified the structure of the baguto,
The purpose of the present invention is to provide a measuring device for a sliding type weight sorter that measures and sorts weight at high speed and with high precision, and has a structure that allows for easy weight adjustment and handling.

For this reason, the present invention has a bucket conveyor in which a large number of bucket carts for carrying fruit side dishes are attached to a chain that runs and rotates endlessly at equal intervals in the direction of travel, and the fruit side dishes are placed one by one on the bucket carts and transported. , a sliding type in which a bucket slides over an electronic weighing machine at a predetermined point during transportation, weighs the fruit and vegetable together with the bucket, and then sorts and discharges the fruit and vegetable to a predetermined discharge section based on the weighing results. In the weight sorter, a sliding part for sliding on the electronic weighing machine is formed on the lower surface of each bucket, and a plurality of loose fitting holes through which the mounting member passes are provided in a part of each bucket. The bucket is attached loosely to the mounting member so that it can be in a non-contact state, and a measurement receiving rail is provided on the top of an electronic weighing machine using a force balance type electronic scale or a row 1 cell scale. The height of the top surface of the measurement receiving rail is such that when the sliding part of the bucket slides on the top surface of the measurement receiving rail, the bucket slides while being slightly lifted by the measurement receiving rail, and the bucket is in a non-contact state with the mounting member. The height and none, and further,
The length of the measurement receiving rail in the traveling direction is approximately equal to the interval at which the buckets are installed, and when the sliding part of the preceding bucket starts to leave the measurement receiving rail, the sliding part of the following bucket enters onto the measurement receiving rail. As if to start, when the leading bucket left 1/2,
In order to prevent the electronic weighing machine from becoming unloaded, the following bucket is configured so that the next bucket enters 1/2 of the way in, so that a load equivalent to one solid bucket is always applied on the measurement receiving rail. Therefore, it is possible to reduce the fluctuation range of the load on the electronic weighing machine, reduce the movement of the weighing mechanism, and reduce the vibrations when the bucket slides on the measuring rail, that is, the waves of electrical signals. A calculation device is installed that receives a signal transmitted from the weighing machine according to the slight positional displacement of the measurement receiving rail via an amplification device, and after the preceding bucket has separated from the measurement receiving rail, the following bucket is detected. clock signal means for transmitting a measurement clock signal to the arithmetic unit each time the bucket reaches a predetermined position before reaching the exit end on the measurement receiving rail, that is, a position where the wave of the electric signal has subsided; The device is configured to calculate the weight of the fruit and vegetable using the calculation device, compare it with preset weight class classification values, and output a discharge signal to the discharge operation device of the corresponding class in synchronization with the movement of the bucket. By doing so, it is possible to perform measurement and selection at high speed and with high precision.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Diagrams showing embodiments of the present invention will be described below.

1 is the chain of the weight sorting machine, which separates fruit and vegetable into 1
A large number of bucket carts 2 for loading individual items are mounted at equal intervals in the traveling direction by mounting members 1a, and run and rotate endlessly to form a bucket conveyor. Each bucket 2 has a plurality of, preferably two, loose fitting holes 2a in a part thereof parallel to the lateral direction (left and right directions perpendicular to the direction of travel), and the loose fitting holes 2a are connected to the mounting member 1a. passes through the mounting member 1a
The bucket carts 2 are loosely fitted so as to be in a non-contact state, and each bucket cart 2 has a sliding portion 2b on the lower surface for sliding on the electronic weighing machine 5. In addition, each bucket 2 has a vertical contact surface 2c in a part thereof, and the corresponding contact surface 2c
A roller 1b that can come into contact with the bucket belt 2 is rotatably attached to a mounting pin 1c attached to the chain 1 for each bucket 2. When the sliding part 2b of the bucket bag 2 slides on the entrance guide rail 3, the measurement receiving rail 9, and the exit guide rail 4, which will be described later, in the weight measurement section, the bag bag 2 comes into a non-contact state with respect to the mounting member 1a. Rotatable roller 1b
The bucket belt 2 is configured to move forward by circumscribing the vertical abutment surface 2c of the bucket belt 2, so that vibrations generated as the chain 1 runs are not transmitted to the bucket belt 2.

As the electronic weighing machine 5, a force balance type electronic scale or a load cell scale is used, and the illustrated example shows a force balance type electronic scale using a top plate type scale. The electronic weighing machine 5 is installed at a predetermined point in the lower part of the transport path of the bucket 2, and a horizontal measuring pedestal 8 is mounted on the upper part of the vertical link 7 of the Roberval mechanism at one end of the rod 6. established,
The measuring rail 9 made of a wear-resistant material and having a predetermined shape is installed horizontally on the upper part of the measuring stand 8, and the height of the upper surface of the measuring rail 9 is controlled by the sliding part 2b of the bucket 2. When sliding on the upper surface of the rail 9, the bucket 2 slides while being slightly lifted by the measurement receiving rail 9, and the bucket 2 slides on the mounting member 1.
It is set at a height that is in a non-contact state with respect to a,
Furthermore, the length of the measurement receiving rail 9 in the traveling direction is made approximately equal to the mounting interval L of the bucket belts 2, so that when the sliding portion 2b of the preceding bucket belt 2 starts to detach from the measurement receiving rail 9, the following bucket belt 2 sliding section 2b of
begins to enter onto the measurement receiving rail 9.

On the other hand, one or more force coils 10 are provided at the tip of the other side of the rod 6, and a displacement detector 11 (hereinafter, this embodiment will be explained as an example using a differential transformer) is installed adjacent to the force coils 10. ing.

Reference numeral 12 denotes an amplification device, and an amplification circuit 13 inputs and amplifies the displacement signal generated in the displacement detector (differential transformer) 11 by the movement of the rod 6 in response to an extremely small displacement of the measurement receiving rail 9. A filter circuit 14 for removing vibrations tuned to the vibration frequency is provided to constitute a feedback amplification circuit, and a voltage signal with smoothed vibration waves is sent to the voltage/current conversion circuit 1.
5, and the current taken out is passed through the force coil 10.
The electromagnetic force of the force coil 10 absorbs the vibration of the rod 6 that occurs when the bucket 2 slides on the measurement receiving rail 9, and the force coil 10
extracts an analog signal proportional to the current flowing through the
An A/D conversion circuit 1 equipped with a deviation correction circuit 17 for correcting the component force due to sliding friction between the sliding part 2b of the bucket 2 and the measurement receiving rail 9, that is, the deviation with respect to the actual weight.
6 and outputs a digital signal proportional to the actual load to the arithmetic unit 18.

The arithmetic device 18 includes a measurement comparison circuit 19, a weight class division value setting circuit 20, a shift circuit 21 for a discharge command signal to a predetermined discharge position, and a discharge position setting circuit 2.
It consists of 2.

Reference numeral 23 designates a clock signal generating switch which is provided in connection with the rotating shaft of the conveyor and serves as clock transmitting means for transmitting a clock signal synchronized with the progress of each bucket 2 to the arithmetic unit 18.

24 is a discharge operation device for tilting the bucket 2 and discharging the fruits and vegetables on the bucket 2.

To explain in more detail, the mounting member 1 is attached to the chain 1.
When the bucket belt 2, which is mounted in a loose fit manner and travels by a, comes onto the entrance guide rail 3, the bucket belt 2 is pushed up slightly by the entrance guide rail 3, and the mounting member 1a and the bucket belt 2 are in a non-contact state in the loose fit hole 2a. At the same time, only the roller 1b rotatably attached to the mounting pin 1c contacts the vertical contact surface 2c of the bucket 2, and the bucket 2 is pushed only by the roller 1b, so that the entrance guide rail 3 Further, it moves forward on the measurement receiving rail 9 and the exit guide rail 4, which are set at the same height as the entrance guide rail 3.

The sliding portion 2b on the lower surface of the bucket cart 2 has a horizontal sliding portion of a predetermined length in the direction of travel, or is provided with sliding rollers, wheels, etc. at the front and rear so that the bucket cart 2 runs stably. Therefore, the load is not concentrated on one point on the measurement receiving rail 9, but is distributed over at least four points on the front, rear, left and right sides. Therefore, the bucket 2 moves from the entrance guide rail 3 to the measurement receiving rail 9,
Also, when transferring from the measurement receiving rail 9 to the exit guide rail 4, the load on the bucket 2 is also transferred accordingly.
Gradually increase, decrease, and then smoothly transfer. Therefore,
As shown in FIG. 7, the length of the measurement receiving rail 9 is set to be approximately equal to the mounting interval L of the buckets, and at the same time that the preceding bucket A begins to leave the measurement receiving rail 9, the following bucket B enters. When the starting bucket A leaves 1/2 of the way, the following bucket B enters 1/2 of the way in, so that the load equivalent to one bucket is always applied on the measurement receiving rail 9. By reducing the fluctuation of the load applied to the measurement receiving rail 9, the vibration of the rod 6 is reduced, and after the preceding bucket A is detached from the measurement receiving rail 9, the following bucket B is placed on the measurement receiving rail 9. Most of the vibrations are absorbed during the journey up to the exit end on the amplification device 9, so that the signal from the amplification device 12 can be obtained horizontally and in a straight line.

When the bucket 2 is transferred from the entrance guide rail 3 to the measurement receiving rail 9 while sliding at high speed, the rod 6 of the electronic weighing machine 5 moves more than the actual load and vibrates slightly up and down, but the tip of the rod 6 When the actuating transformer 11 attached to the rod 6 detects the displacement of the rod 6 and amplifies the displacement voltage corresponding to the displacement position using the amplifier circuit 13, the vibration frequency is adjusted to smooth the vibration wave of the voltage signal. A feedback amplification circuit is constructed by providing a filter circuit 14 tuned to In the portion where the bucket 2 absorbs vibrations and reaches the exit from the center of the measurement receiving rail 9, the electromagnetic force of the force coil 10 is balanced against the load of the bucket 2, which slides stably, and the rod 6 becomes stable.

On the other hand, when the analog signal generated in proportion to the current flowing through the force coil 10 is extracted and converted by the A/D conversion circuit 16, the force coil 10
Since the bucket 2 is sliding, the balanced force generated by the bucket 2 is affected by the component force due to the vibration friction caused by sliding, and increases in proportion to the load by the amount of component force that is applied compared to the actual load in a stationary state. or decrease (the above-mentioned component force may act positively or negatively depending on the transport mechanism of the bucket cart 2), so a deviation correction circuit 17 is provided to correct this deviation, and the A/ The amplification device 12 is constructed by using the D conversion circuit 16 to output a digital signal proportional to the actual load to the arithmetic unit 18.

Furthermore, the measurement receiving rail 9 is preferably placed at a predetermined position after the preceding bucket 2 leaves the measurement receiving rail 9 and until the following bucket 2 reaches the outlet end on the measurement receiving rail 9. Each time the bucket belt 2 reaches the upper exit end position, that is, each time the vibration of the pole is absorbed and the load and the electromagnetic force of the force coil are balanced and stabilized, the clock signal transmitting switch 23 as the clock transmitting means,
A measurement clock signal for starting measurement is sent to the arithmetic unit 18.

The arithmetic unit 18 converts the digital signal proportional to the actual weight sent from the width increaser 12 into a measurement comparison circuit 19 using the measurement clock signal for starting the measurement.
calculates the weight of the fruits and vegetables, compares the calculation result with the set value of the weight class classification value setting circuit 20, detects the corresponding class, and outputs the discharge position setting circuit 22.
According to the discharge position set for each class, the discharge signal is shifted in the shift circuit 21 by a clock signal sent from the clock signal transmission switch 23 in synchronization with the movement of the bucket 2, and the discharge actuating device 24 is actuated. It is something. In this way, the fruits and vegetables placed on the bucket 2 are tilted by the operation of the discharge actuating device 24, and are discharged onto receiving boxes provided for each class for sorting.

In addition, the present invention does not apply the load concentratedly to one point when viewed from the side, but the sliding portions 2b on the lower surface of the bucket carts 2, which are installed in large numbers at equal intervals on the chain 1, have a predetermined length in the direction of movement. It has a horizontal sliding part, or the load is distributed over four or more points on the front, back, left, and right.

As described above, when a large number of buckets attached to the chain at equal intervals in the traveling direction by attachment members slide on the measurement receiving rail provided on the upper part of the electronic weighing machine, Since the bucket is in a non-contact state with the mounting member, the vibration of the chain during movement is not transmitted to the bucket on the measurement receiving rail, so the chain vibration does not affect the electronic weighing machine. It has the effect of being able to weigh and sort with high precision.Furthermore, the length of the measurement receiving rail in the advancing direction is approximately equal to the interval at which the buckets are installed, so that the sliding part of the preceding bucket can separate from the measurement receiving rail. The structure is such that when the sliding part of the succeeding bucket starts to enter the measuring receiving rail, and after the preceding bucket is detached from the measuring receiving rail, the succeeding bucket is configured so that it reaches the exit end of the measuring receiving rail. Since it is configured to measure at a predetermined position until reaching .
Even when the bucket slides and travels at high speed, the electronic weighing machine does not always become unloaded, and the range of variation in the load on the electronic weighing machine is small, as shown in Figure 7.
As shown in the output diagram of the width increasing device as the bucket slides, it is possible to extremely reduce the fluctuation due to load fluctuations, and because the measurement is performed at a position where there is almost no fluctuation, it is possible to measure with high accuracy and high speed. This has the effect of allowing selection by

Further, the present invention provides one electronic weighing machine at a predetermined point at the lower part of the transport path of the bucket conveyor, and there is no need to provide it for each sorting class. Since the structure of the weighing machine is simple, weight adjustment and handling are extremely easy.

[Brief explanation of drawings]

FIG. 1 is an output diagram when a conventional electronic weighing machine is used as a traveling scale. Figures 2 to 8 all show examples of the present invention, with Figure 2 being an overall plan view of the sliding type weight sorter, Figure 3 being a schematic side view thereof, and Figure 4 being a diagram of the measuring device. An explanatory diagram of the main parts, Fig. 5 is a plan view of the electronic weighing machine, Fig. 6 is a sectional view of the weighing part of the sliding type weight sorter, and Fig. 7 is the relationship between the movement of the bucket and the electronic weighing machine and the width increasing device. FIG. 8 is a cross-sectional view of the discharge section of the sliding weight sorter. 1... Chain, 2... Bucket, 3... Entrance guide rail, 4... Outlet guide rail, 5... Electronic weighing machine, 6... Rod, 7... Vertical link, 8... Measuring pedestal, 9
...Measurement receiving rail, 10...Force coil, 11...
displacement detector, 12... amplification device, 13... amplification circuit,
14... Filter circuit, 15... Voltage/current conversion circuit, 16... A/D conversion circuit, 17... Deviation correction circuit, 18... Arithmetic device, 19... Measurement comparison circuit, 20
...Weight class classification value setting circuit, 21...Shift circuit,
22... Ejection position setting circuit, 23... Clock signal start switch, 24... Ejection actuation device, A... Leading bucket, B... Next bucket, L... Bucket mounting interval, 1a... Mounting member, 1b... Roller, 1c...
Mounting pin, 2a... Loose fitting hole, 2b... Sliding part, 2c...
Contact surface.

Claims (1)

[Claims] 1. A bucket conveyor is equipped with a large number of bucket carts that are mounted at equal intervals in the direction of travel on a chain that runs endlessly and rotates endlessly. Fruit snacks are placed one by one on the bucket carts of the bucket conveyor, and conveyed to a certain point during the conveyance. In the sliding type weight sorting machine, the bucket weighs the fruit snacks together with the bucket by sliding over the electronic weighing machine at a point, and the fruit snacks are sorted and discharged to a predetermined discharge section based on the weighing results. Each bucket has a sliding portion on its lower surface, and a plurality of loosely fitting holes through which the mounting member passes through a portion thereof, and is mounted in a loosely fitting manner so that it can be in a non-contact state with the mounting member. , a measurement receiving rail is provided on the top of the electronic weighing machine at a height such that the bucket is in a non-contact state with the mounting member when the sliding part of the bucket slides on the upper surface; The length in the traveling direction is approximately equal to the interval between bucket belts, so that when the sliding part of the preceding bucket belt starts to leave the measurement receiving rail, the sliding part of the following bucket belt starts to enter onto the measurement receiving rail. A computing device is provided to receive a signal corresponding to the displacement of the measurement receiving rail transmitted from the electronic weighing machine via an amplification device, and after the preceding bucket has separated from the measurement receiving rail, the following Clock transmitting means is provided for transmitting a measurement clock signal to the computing device each time the bucket reaches a predetermined position until the bucket reaches the exit end on the measurement receiving rail, and the computing device calculates the weight of the fruit and vegetable dish. What is claimed is: 1. A measuring device for a sliding type weight sorter, characterized in that the measuring device calculates the weight class classification value, compares it with a preset weight class division value, and outputs a discharge signal to a discharge operating device of the corresponding class.