JPS5940120A - Automatic multistage weight sorting device - Google Patents

Abstract

PURPOSE:To perform automatic sorting operation with high precision at a high speed, by moving a work conveyed by a conveyor pawl from the conveyor pawl to a conveyer belt and then taking a measurement. CONSTITUTION:The conveyor pawl 9 and conveyor belt 19 rotate in the same direction at nearly equal speeds (without exceeding a conveyor speed) and a work W fed to the conveyor is conveyed whie mounted on the lower corner part of the conveyor pawl 9. Then, the conveyor pawl 9 moves to a measurement inclination position and the work W is passed from the conveyor pawl 9 to the conveyor belt 19, but a balancing mechanism 2 measures the weight of the work W under a command generated before or after the mounting, so that a sorting gate selected on the basis of the measurement result is opened toward a low- level part side. The work W passed through the balancing mechanism 2 is mounted by the conveyor pawl 9 at an intermediate inclination position and the conveyor belt 9 oscillates to a discharge inclination position 19d when the work arrives at over a discharge shoot 5 corresponding to the weight section, dropping the work into a discharge shoot 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-stage automatic weight sorting device used for weight sorting of irregularly shaped objects such as marine products and agricultural products.

In the conventional structure of this type of automatic sorting device, the object to be weighed (hereinafter referred to as the work) is placed in a packet as a transport container, and during transport, the whole packet is weighed by a scale, and then the weight is measured. A method has been adopted in which the values are divided into weight classification stages and each workpiece is ejected from the packet into a chute for each stage, but with this conventional packet transport method, variations in packet weight directly lead to measurement errors. Therefore, it is necessary to standardize the weight of the packets, and the weight of dirt that adheres to the packets during work can cause errors, making it difficult to sort with high precision.Also, because the packets are large, there is a problem in transportation. It is difficult to close the
As a result, there were drawbacks such as high-speed sorting cannot be expected.

The present invention has been made to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a multi-stage automatic weight sorting device that enables high-accuracy and high-speed sorting operations. .

As a means to achieve this objective, the automatic sorting device of the present invention comprises an endless conveyor that rotates continuously, and a large number of conveyor claws whose swing bases are attached to the conveyor at regular intervals. It can be swung into three positions: a tilting position for receiving and supporting the object to be weighed, a tilting measurement position for lowering the object to be weighed, and a tilting ejection position for dropping the object that has been placed. A conveyor/R that is movably formed and in which objects to be weighed are sequentially introduced, a weighing mechanism that is suspended on the conveyance path of the conveyor claw and uses a conveyor belt as a weighing platform, and a conveyor downstream of the weighing mechanism. a plurality of discharge chutes arranged in a line below the path; a guide rail fixedly installed along the conveyor, the guide rail guiding and driving the tilting of the conveyance claw by a cam groove formed in the rail; , respective sorting darts provided in the cam groove at positions facing each of the discharge chutes, and an instruction control device that selectively opens and closes the sorting darts in response to the detected value of the weighing mechanism. The conveying pawl is guided by the cam groove, takes a tilting position for placing the object upstream of the weighing mechanism, and takes a tilting position for measuring when the weighing mechanism is moving, so that the object to be weighed cannot be placed above the weighing mechanism. It is characterized in that it is transferred onto a moving belt and, downstream of the weighing mechanism, is formed so as to be placed in the sorting dart corresponding to the weight classification stage of the weighed value and assume a tilted discharge position.

The present invention will be described below based on an illustrated embodiment.

As shown in FIGS. 1 to 4, the automatic sorting device of the embodiment includes an endless conveyor consisting of a pair of left and right chain bands 1, a drive mechanism for driving the conveyor, and an upstream side of the upper conveyor. In other words, the weighing mechanism 2 is installed close to the top on the left side of the drawing, and its scale platform 3 is suspended directly below the conveyor, and the weighing mechanism 2 is fixed along the side of the upper chain band 1 on one side. A plurality of discharge chutes 5 arranged in a line downstream of the weighing mechanism 2 of the upper conveyor, a water washing mechanism 6 installed at an intermediate position of the lower conveyor, and a suitable position (in the illustration, It consists of an instruction controller 7 installed in the vicinity of the weighing mechanism 2, and an object supply device 8 installed squarely upstream of the weighing mechanism 2. Each part will be explained in detail below. explain.

Between both chain bands 1 of the conveyor, a base shaft 9a of a conveying pawl 9 in the form of a fixed interval is swingably supported, and at the tip of the base shaft 9a passing through one chain belt 1, a guide A passive lever 11 on which a roller 10 is installed is pivotally mounted.

Conveyor drive mechanism This mechanism operates in conjunction with a drive sprocket 12 and a driven sprocket 13 at both ends of the conveyor, a drive motor 14, a gear transmission 15 that transmits the output of the motor 14 to the drive sprocket 12, and a gear transmission 15 that transmits the output of the motor 14 to the drive sprocket 12. The encoder 16 detects the moving phase of the conveyor.
The detection output of the encoder 16 is input to the instruction controller 7.

Idrail 4 A cam groove 17 is bored in the rail 4 surface to guide and drive the guide roller 10 of the passive lever 11 of the conveyor claw 9 to tilt and drive the conveyor claw 9. From upstream to downstream, the following level parts are molded.

The upper level portion 17a is formed at a position corresponding to the upstream side of the weighing mechanism 2, and when the row 210 is engaged with this portion 17a, the conveying claw 9 is in a tilted position with the tip of the claw plate 9b facing the earth. (referred to as the tilted mounting position).

Middle level portion 17b is formed at a position corresponding to the weighing mechanism 2, and is formed at a position corresponding to the weighing mechanism 2.
0 is engaged with this portion 17b, the claw plate 9b is at a tilting position K (referred to as a measurement tilting position) where it is approximately horizontal.

The intermediate level portion 17c and the lower level portion 7d are formed in two stages Q at positions corresponding to the downstream side of the weighing mechanism 2, and at positions corresponding to the upstream side of each discharge chute 5,
A separating section 18 is provided that selectively opens and closes the branch section and both sections 17c and 17d.

Therefore, when the roller 10 is engaged with the intermediate level portion 17C, the claw plate 9b assumes a slightly upward tilted position in order to prevent the object to be dropped during conveyance, while the lower level portion 1
In the 7dK engaged state, the claw plate 9b assumes a tilted position (referred to as a discharge tilted position) in which it faces diagonally downward.

The weighing platform 3 suspended from the weighing mechanism 2 is provided with a double-row transfer heald 19 arranged on the width line of the nail plate 9b and the erroneous position. The hook between it and the pulley 21 is rotated and continuously rotates, that is, the upper transfer belt 19 is located close to the bottom of the conveyor and moves in the same direction as the conveyor at approximately the same speed (within a range not exceeding the conveyor speed). Move to prevent contact between the claw and the object to be measured.

However, in the weighing mechanism 2, as described later,
In addition to measuring the weight difference before and after the measurement timing,
The measured value signal is outputted to the instruction control device 7.

Discharge chute 5 Consists of a receiving plate with a flange that has a descending slope in the direction of the open phase a in Fig. 2.

Water cleaning mechanism 6 A cleaning water spray nozzle 22 and a drain opening 23 are provided in the tank through which the lower conveyor passes, and this mechanism cleans dirt attached to each conveyance claw 9 passing through the tank. It has the effect of dropping.

Instruction controller 7 Based on the movement phase of the conveyor inputted from the encoder 16, the controller 7 instructs the object supplying device 8 to load the work W at predetermined timings, and also instructs the weighing mechanism 2 to Then, using the measured value inputted from the weighing mechanism 2 to compare the soil to the predetermined weight classification stage, the sorting cage 18 of the corresponding stage is opened on the lower level portion 1.7d side. Performs the commanded action.

Next, the operation of the sorting device according to the embodiment configured as described above will be described.

When the device is started, the conveying claw 9 and the conveying belt 19 rotate in the same direction at approximately constant speed (within a range that does not exceed the conveyor speed), and the workpiece W fed from the feeder 8 to the conveyor , and is transported while being placed on the lower corner of the transport claw 9.

Next, just before the transport claw 9 reaches the measurement tilt position, the work W
Based on the descent of the workpiece, the workpiece is transferred from the transporting claws (9) to the transfer belt 19, but the weighing mechanism 2 calculates the weight difference, i.e., according to measurement commands issued before and after the transfer. The weight of the workpiece W is measured, and based on this, the selected sorting dart 18 is opened on the lower level portion 17d side.

Therefore, the workpiece W that has passed through the weighing mechanism 2 is once reliably placed on the transport claw 9 in the intermediate tilting position, and then when it reaches the upper part of the discharge chute 5 corresponding to the weight category, the workpiece W is placed on the transport claw 9 is swung to the discharge tilting position, the pieces fall into the sorted discharge chute 5 and are discharged to the side of the conveyor.

Note that the empty conveyance claw 9 is cleaned by the water cleaning mechanism 6 from time to time.

In this way, in the sorting device of the embodiment, since the zero correction of the scale is performed every time, the conveyance claw 90 as a conveyance container
Weight is independent of measurement accuracy, so a highly accurate sorting is performed.

Since the idle roller 10 of the transport claw 9 is guided by the cam groove 17, the workpiece W does not generate noise during transport, and the pitch of the transport claws 9 can be made close, allowing high speed. This makes it possible to select.

As described above, according to the multi-stage weight sorting device according to the present invention, the scale table is provided with a transfer belt and is moved at approximately the same speed as the conveyor (within a range not exceeding the conveyor speed), and is also conveyed by the conveyor claw. The structure is such that the workpiece is transferred from the transport claw to the transfer belt during measurement, and zero correction is performed the moment the workpiece is not on the measuring table or when the workpiece is removed once every fixed period of time. In addition to enabling accurate and high-speed sorting, it can also be widely used for weight sorting of various irregularly shaped objects of different sizes, and has the effect of improving the practicality of automatic sorting equipment.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of a multi-stage weight sorting device showing an embodiment of the present invention, Fig. 2 is a partial plan view of the open phase ■ shown in Fig. The side sectional view at −111 m, FIG. 4, is an enlarged view of the weighing section of FIG. 1. W... Work as an object to be weighed, ■... Conveyor drain pipe 5... Discharge chute, 7... Indication and control device, 8... Work feeder, 9... Conveyance claw, 9a.
... Base shaft, 17... Cam groove, 18... Sorting dirt,
19...transport belt. Patent applicant Anritsu Electric Co., Ltd.

Claims (1)

[Scope of Claims] An endless conveyor that rotates continuously, and a number of conveyor claws whose swing bases are attached to the conveyor at regular intervals, and a tilting position for receiving and supporting dropped objects to be weighed. The conveyor is configured to be swingable in three positions: a measurement tilting position in which the placed object to be weighed is lowered, and a discharge tilting position in which the placed object to be weighed is dropped. a conveying claw into which objects to be weighed are sequentially input; a weighing mechanism using a transfer belt suspended above the conveying path of the conveying pawl as a weighing platform; and a weighing mechanism arranged below the conveying path downstream of the weighing mechanism. A plurality of discharging chutes are arranged, a kite rail is fixedly installed along the conveyor, and a cam groove formed in the rail guides and drives the tilting of the conveyance claw; The conveying claw is equipped with a respective sorting dart provided at a location facing each discharge chute, and an instruction control device that selectively drives the sorting dart to open or close in response to the detected value of the weighing mechanism. Guided by the cam groove, the object to be weighed is placed at a tilted position upstream of the weighing mechanism, and when the weighing mechanism passes, it is tilted for measurement, and the object to be weighed is transferred and placed on the transfer belt. A multi-stage automatic weight sorting device, characterized in that downstream of the weighing mechanism, it is formed so as to take a tilted discharge position guided by the sorting dart corresponding to the weight classification stage of the weighed value.