JPH0423729B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a weighing device used in an automatic weight sorter for irregularly shaped objects such as marine products and agricultural products.

(Prior art) A conventional weighing device used in this type of automatic sorting machine places an object to be weighed (hereinafter referred to as a workpiece) in a bucket as a transport container, and then transports the bucket together with the weighing machine during transport. The method used was to measure the weight of each workpiece over a bucket, divide the weight into weight categories, and then discharge each workpiece from a bucket into a chute for each level.

(Problems to be Solved by the Invention) However, according to such a conventional method using a bucket, it takes time for the output of the scale to stabilize, making it difficult to measure at high speed and with high precision. In addition, variations in the weight of the bucket can directly lead to measurement errors, so there is the hassle of having to standardize the weight of the bucket, and the weight of dirt that adheres to the bucket during work can cause errors.
The drawback was that high-speed, high-accuracy measurements could not be expected.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and the purpose of the present invention is to enable high-speed and high-accuracy measurement of a workpiece.
To provide a weighing device using a plurality of claws instead of a bucket, and capable of performing zero correction when there is a gap between workpieces during high-speed measurement and at the time of each weighing during low-speed measurement.

(Means for Solving the Problems) Next, a first invention and a second invention as means for achieving the above object will be described with reference to drawings corresponding to embodiments.

The first invention corresponds to the first embodiment shown in FIGS. 1 to 4, and consists of a plurality of nail plates 3a arranged in parallel at a predetermined interval in the width direction with their bases connected to each other. From a plow-shaped conveying claw 3 and left and right endless bands in which a plurality of conveying claws 3 are arranged at approximately equal intervals along the traveling direction with the left and right sides of the base of the carrying claws 3 rotatably connected. A first endless conveyor 2 consisting of; and a conveyance device 1 consisting of; double-row endless strips that are provided in a staggered manner within the interval between the claw plates 3a of the conveyance claws 3 and move at approximately the same speed as the conveyance device 1; 14a, and is provided along the conveyance path of the conveyance device 1 in the middle of the conveyance path.
The endless conveyor 14 has a scale stand 5 having a comb-tooth-shaped top plate arranged in a staggered manner within the interval between the claw plates 3a of the conveying claws 3, and the top plate of the scale stand 5 is the second endless conveyor. a weighing device 4 provided substantially in contact with a band 14a forming an endless conveyor 14; At this time, the conveyor claw 3 rotates downward to place the object to be weighed on the second endless conveyor 14, and at the same time places it on the weighing platform 5 for weighing. 3 rotates upward to place the object to be weighed on the transport claw 3 and transport it.

The second invention corresponds to the second embodiment shown in FIGS. 5 and 6, and consists of a plurality of nail plates 3a arranged in parallel at a predetermined interval in the width direction with their bases connected to each other. From a plow-shaped conveying claw 3 and left and right endless bands in which a plurality of conveying claws 3 are arranged at approximately equal intervals along the traveling direction with the left and right sides of the base of the carrying claws 3 rotatably connected. A first endless conveyor 2 consisting of; and a conveyance device 1 consisting of; double-row endless strips that are provided in a staggered manner within the interval between the claw plates 3a of the conveyance claws 3 and move at approximately the same speed as the conveyance device 1; and a second endless conveyor 26 provided along the conveyance path of the conveyance device 1 in the middle of the conveyance path; and a weighing device 4 that supports the second endless conveyor 26 as a top plate of a scale stand. and; When the conveying claw 3 carrying the object to be weighed passes through the second endless conveyor 26, the conveying claw 3 rotates downward and transfers the object to be weighed to the second endless conveyor 26. The weighing device is characterized in that the weighing device weighs the object at the same time as the object is placed on the top, and after the weighing operation, the transport claw 3 rotates upward to place the object to be weighed on the transport claw 3 and transfer it. It's in the device.

(Function) In the first invention, the object to be weighed is placed on each conveyance claw 3 before reaching the second endless conveyor 14, and when it reaches the position of the second conveyor 14,
The conveying claw 3 rotates downward to place the object to be weighed on the top plate of the weighing platform 5, and with the second endless conveyor 14 slightly bent downward, the object to be weighed is weighed. After weighing, the object to be weighed is moved downstream from the weighing platform 5 by the second endless conveyor 14, and at this time, the conveyance claw 3 rotates upward to place the object to be weighed again. It is moved to a process (in the embodiment, the discharge chute 9).

In the second invention, when the conveyance claw 3 on which the object to be weighed is placed on the second endless conveyor 26, the conveyance claw 3 rotates downward and transfers the object to be weighed from the upper surface of the scale platform 5. The sample is placed on the second endless conveyor 26 and weighed.

(Embodiment) FIGS. 1 to 4 show a first embodiment of the present invention, and the first embodiment will be explained using these figures.

In the automatic sorting machine equipped with the conveying device 1 as the weighing device of the first embodiment, FIGS.
As shown in the figure, the work W is transported while being placed on the claw plates 3a of a large number of plow-shaped transport claws 3 attached at regular intervals to a first endless conveyor 2 made of a chain conveyor. In between, a method is adopted in which the weight is measured when passing over a scale stand 5 rising from a scale 4, and the first endless conveyor 2 has a drive sprocket 7 driven by a motor 6 and a driven sprocket 7, It is hung between the sprocket 8 and rotates at a constant speed.

Therefore, on the downstream side of the weighing device 4, that is, below the first endless conveyor 2 on the right side of the drawing, a plurality of discharge chutes 9 made of receiving plates inclined diagonally downward in the width direction (arrow a) are arranged in a line. The workpieces W, which are placed on the endless conveyor 2 starting from the workpiece feeder 10, are conveyed to the conveyance claw 3 and passed over the weighing table 5, and then selected to the discharge chute 9 for each weight classification stage. It is becoming more and more arranged.

By the way, each conveyance claw 3 is connected to a guide roller 12 of a passive arm 11 that is pivoted to one end of a base shaft 3b that is supported by the first endless conveyor 2.
By being guided by a guide rail 13 (see Fig. 4) fixed along one side of the endless conveyor 2 and driven in the vertical direction, the swinging angle of the claw plate 3a changes in accordance with the moving position. It is regulated as follows.

(a) When the scale 4 is placed in the upstream position, the claw plate 3a
It forms an oscillating tilt angle with the tip raised.

(b) At the position where the scale 4 is being passed, the claw plate 3
The swing angle is lower than the previous state.

(c) At a position downstream from the scale 4, the claw plate 3
The tip of the claw plate 3a is kept at the swinging inclination that returns it to the state shown in (a), but the tip of the claw plate 3a is lowered when it reaches the position above the selected discharge chute 9 according to a command from a pipe manufacturer (not shown). The oscillation angle changes to the specified angle.

Next, on the comb-tooth-shaped top plate of the weighing platform 5 that rises from the weighing device 4, a transfer band consisting of double rows of band members 14a arranged on the width line at the intersecting position with the claw plate 3a is attached. A part of the second endless conveyor 14 is in sliding contact with the second endless conveyor 14, and the second endless conveyor 14 is continuously rotated between the drive roller 15 and both guide rollers 16. conveyor 14
The horizontal portion of is located close to the bottom of the first endless conveyor 2 and is moving in the same direction as the first endless conveyor 2 at approximately the same speed.

Moreover, receiving plates 17 and 18 for receiving the lower surface of the second endless conveyor 14 are provided between the scale table 5 and each of the guide pulleys 16 on both sides.

Although mylar film is used as the material for the band 14a, a rubber belt, chain, or the like may be used instead.

In addition, a position detector 19 is provided near the movement path of the transport claw 3 above the downstream or upstream end of the scale stand 5 to detect when the transport claw 3 passes above the scale stand 5.
is located.

Note that, as described above, at the position where the transport claw 3 enters the weighing device 4, the swing of the transport claw 3 causes the claw plate 3 to
Since a descends downward, the workpiece W is transferred to the transfer band 14 and floats up from the claw plate 3a, and then moves along with the transfer band 14 while passing through the weighing platform 5.

Next, the controller (not shown) includes a position detector 19.
The detection value of the movement position of the first endless conveyor 2 output from the control device is input, and based on this, the control device transmits the workpiece W to the second endless conveyor 14 and places it on the scale table 5. When the balance is stable, the output of the scale 4 is taken in as a weighed value.

Therefore, in the control device, the weight value is compared with a predetermined weight classification stage to select the classification stage, and corresponding to the classification stage, a guide rail 13 is installed to lower the tip of the claw plate 3a. The controller commands the operation of the gate 13a.

As a result, the transport claw 3 that has passed the upper part of the weighing device 4 and placed the workpiece W again drops the workpiece W onto the discharge chute 9 above the sorted discharge chute 9, and drops the workpiece W onto the discharge chute 9 that has been sorted. It is discharged to the side of the endless conveyor 2.

As described above, in the weighing operation of the embodiment, since measurement is performed based on the weight difference, the weight of the transport claw 3 as a transport container is irrelevant to measurement accuracy, and therefore, highly accurate measurement is possible. It will be done.

Conveyance device 1 as a weighing device of other embodiments
The structure described above has the following characteristics.

(a) Since the weighing device 4, the scale stand 5, and the related mechanisms of the second endless conveyor 14 are all installed inside the first endless conveyor 2, the entire apparatus is compact.

(b) Since the weighing device 4 is immobile, the internal operation of the weighing device 4 is stable.

(c) Since the first endless conveyor 2 and the second endless conveyor 14 move at approximately the same speed, there is no possibility that the workpieces will roll during the transfer of the workpieces W.

(d) Since the timing of the weighing operation is determined by directly detecting the conveyance claw 3 using the workpiece position detector 19, it is possible to accurately determine the elapsed time required for the weighing operation, and thereby stable weighing can be performed. .

FIG. 5 and FIG. 6 show a second embodiment, and the second embodiment will be explained using these figures.

That is, in the configuration of the first embodiment described above, since both guide rollers 16 and both receiving plates 17 and 18, on which the second endless conveyor 14 is guided, are installed in immovable parts, it is difficult to perform the measurement operation. Although it is a slight step that does not have any influence, there is a difference in height between the height of the top plate of the weighing platform 5, and there is a risk that this will make the weighing measurement unstable.To eliminate this risk, A structure in which the related mechanism of the second endless conveyor is integrated with the scale stand is preferable.

As a structure corresponding to this, the weighing section of the second embodiment will be described below with reference to FIGS. 5 and 6.

A weighing stand 2 with a comb tooth-shaped cross section rises from the weighing section 20
1, a driving roller 22 and a driven roller 23 are horizontally mounted and bearing supported at the front and rear parts, respectively, and
The drive roller 22 is connected to the weighing table 21 via a belt 24.
It is driven by a motor 25 installed on the bracket of the side plate.

A second endless conveyor 26 as a transfer band for transferring the workpiece W is wound between both rollers 22 and 23, and the conveyance claw 3 of the first endless conveyor 2 is connected to each roller 22, 23. It is designed to move through 23 valley spaces. This second endless conveyor 26 is formed of double rows of endless bands arranged in a staggered manner within the spacing between the claw plates 3a.

In the weighing section formed in this way, since the second endless conveyor 26 also serves as the top plate of the weighing table, there is no deviation in the vertical direction in the middle, and therefore there is no influence on the weighing measurement. Never give up.

(Effects of the Invention) As described above, according to the weighing device according to the present invention, the second endless conveyors 14 and 26 are arranged on the weighing stands of the weighing devices 4 and 20, and the workpieces are placed on the weighing stands of the weighing devices 4 and 20. When the transport claw 3 passes over the weighing table, the transport claw 3
Since the park is rotated downward and the park is transferred from above the conveying claw 3 onto the scale stand and the second endless conveyor 14, 26 for weighing, only the workpiece can be automatically weighed at the time of weighing. , measurement errors due to variations in the weight of each transport claw 3 as a bucket on which the work is placed will not occur;
This has the advantage that accurate measurements can be performed at high speed while moving each workpiece on the scale table.

In addition, the second endless conveyors 14 and 26 that move the workpiece on the upper surface of the weighing table are provided with each claw plate 3a of the conveyor claw 3.
Since it is formed by double rows of endless bands arranged in a staggered manner within the interval of Automatic weighing becomes possible.

Furthermore, in each measurement, the weight measurement accuracy can be maintained at a high level of accuracy by removing the workpiece at the moment when the workpiece is not on the scale table or once every fixed period of time to perform zero correction of the weight.

[Brief explanation of drawings]

1 is a schematic front view of a weighing device showing a first embodiment of the present invention, FIG. 2 is a plan view taken at the arrow in FIG. 1, FIG. 3 is an enlarged view of the weighing section in FIG. 1, and FIG.
The figure is a sectional view of the guide rail 13 shown in FIG. 1, and FIG. 5 is a schematic front view of the weighing section showing the third embodiment.
FIG. 6 is a side view of the same. a... Width direction, W... Work as an object to be weighed, 1... Conveyance device, 2... First endless conveyor, 3... Conveyance claw, 3a... Claw plate, 4, 20...
Weighing device, 5, 21... Weighing stand, 14, 26... 2nd
Endless conveyor, 14a...band body.

Claims (1)

[Scope of Claims] 1. A plow-shaped conveyance claw 3 consisting of a plurality of nail plates 3a arranged in parallel at a predetermined interval in the width direction with their bases joined together, and the right and left sides of the base of the conveyance claw 3. A first endless conveyor 2 consisting of left and right endless belts in which a plurality of conveying claws 3 are arranged at approximately equal intervals along the traveling direction with both sides rotatably connected; and a conveying device 1; It has double rows of endless bands 14a that are arranged in a staggered manner within the spacing between the claw plates 3a of the transport claws 3 and move at approximately the same speed as the transport device 1, A second
The endless conveyor 14 has a scale stand 5 having a comb-tooth-shaped top plate arranged in a staggered manner within the interval between the claw plates 3a of the conveying claws 3, and the top plate of the scale stand 5 is the second endless conveyor. a weighing device 4 provided substantially in contact with a band 14a forming an endless conveyor 14; At this time, the conveyance claw 3 rotates downward to place the object to be weighed on the second endless conveyor 14, and at the same time places it on the weighing platform 5 for weighing. After the weighing operation, the conveyance claw 3 rotates upward to place the object to be weighed on the conveyance claw 3 and transfer it. 2. A plow-shaped conveying claw 3 consisting of a plurality of claw plates 3a arranged in parallel at predetermined intervals in the width direction with their bases connected to each other, and a rotatable both left and right sides of the base of the carrying claw 3. a first endless conveyor 2 consisting of left and right endless bands in which a plurality of conveying pawls 3 are arranged at approximately equal intervals along the traveling direction in a connected state; and a conveying device 1 comprising; the pawls of the conveying pawls 3; It has a double row of endless strips in which the plates 3a are interspersed with each other at intervals and moves at substantially the same speed as the conveyance device 1, and is provided along the conveyance path of the conveyance device 1 in the middle of the conveyance path. a second endless conveyor 26; a weighing device 4 supporting the second endless conveyor 26 as a top plate of a weighing platform; When passing through the conveyor 26, the conveyance claw 3 rotates downward to place the object to be weighed on the second endless conveyor 26 and weigh it at the same time, and after the weighing operation, the conveyance claw 3 rotates upward. A weighing device characterized in that it is configured to move to place an object to be weighed on the transport claw 3 and transport it.