JPH0979895A - Grain weight measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the measurement accuracy of a grain weight measuring device supporting a load cell like a cantilever beam with no trouble by providing a mechanism vertically moving a weight automatically in the measurement. SOLUTION: The base end of a load cell 14 is fixed to a frame 13 erected on a base 2, and a measuring hopper 11 is fixed to its free end via a beam material 15. A weight tray 21 is provided on the upper face of the beam material 15, and a weight 22 is stably mounted on the tray 21. A weight receiver 24 drifted downward by a spring 26 is provided on the tray 21. A deep hole 31 is provided at the bottom section of the weight 22, and a pin 36 penetrating the beam material 15 is inserted into the deep hole 31. The pin 36 is planted at the upper end of a rod material 35 vertically moved by a cam 41. The cam 41 is vertically moved by a motor 43 via gears 42, 44, and the weight 22 is vertically moved between the tray 21 and the receiver 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weight measuring device for grains, and particularly, the weight of the grains being conveyed is temporarily retained in a weighing hopper held by a load cell in a cantilever manner. Regarding a weight measuring device.

[0002]

2. Description of the Related Art Weighing hopper devices, which are supported by a load cell in a cantilever manner and weigh the grains retained therein, are known. In this load cell, a weighing hopper is fixed to the other end of a cantilever whose one end is fixed to the structure of the main body, a strain gauge is attached on the beam to form a bridge circuit, and the strain of the beam is detected to detect the weight of the weighing hopper. Was to measure. Further, a gate is provided at the bottom of the weighing hopper to open and close the bottom, and the gate is closed to receive the conveyed grain, and after weighing, the gate is opened to release the grain.

In the weighing hopper, the apparent weight of the weighing hopper changes due to the attachment of foreign matter or abrasion. Further, the load cell and its electric circuit are susceptible to temperature changes. Therefore, unless the load cell is calibrated in consideration of changes in its own weight, temperature changes, etc. for each measurement measurement, sufficient measurement accuracy cannot be obtained. In such calibration, a weight signal of, for example, 100 g is placed on the weighing hopper, the load signal from the load cell is set to the weight of the weight, for example, 100 g, and then the weight is removed. In this case, the load signal from the load cell is set to 0 g. . As a result, the weight of 0 g to the weight (100
Calibration during g) is performed.

However, it is very troublesome to place or remove the weight on the weighing hopper at each measurement for the above weight calibration.

[Problems to be Solved by the Invention]

The present invention has been made in view of the above, and the first object of the present invention is to perform the above-mentioned weight calibration automatically at each measurement, and to arrange and remove the weights manually. It is possible to provide a grain weighing device that holds a weighing hopper in a cantilever manner with a load cell, which can be performed without any operation.

A second object of the present invention is to provide a grain weight measuring device capable of stably holding the weight when the weight is used and not used.

A third object of the present invention is to provide a grain weight measuring device capable of stably holding the load cell so as not to apply a load on the load cell when it is not used.

[0008]

According to the present invention, a grain weight measuring device includes a main body, a weighing hopper provided in the main body and having an openable / closable bottom portion, and means for supplying grain to the weighing hopper. , A rod-shaped load cell that carries a weighing hopper at one end and the other end is fixed to the main body, a weight pan provided on the load cell, and a weight receiver that is fixed to the main body above the weight pan in alignment therewith. , A weight arranged to move up and down between the weight pan and the weight receiver, a means for moving the weight up and down between the weight pan and the weight receiver, and a signal from the load cell to input the grain in the weighing hopper. A measuring circuit for weighing
And a control means for controlling the measuring circuit and means for moving the weight up and down.

According to one embodiment of the present invention, the weight described above has a conical top and bottom, and the inner surfaces of the weight pan and the weight receiver respectively have a conical bottom and top of the weight. Therefore, the weights can be stably received in these weight pans and weight receivers. Furthermore, according to the present invention, the grain weight measuring device includes a main body, a weighing hopper that is provided in the main body, and has a bottom that can be opened and closed.
A means for supplying grains to the weighing hopper, a rod-shaped load cell having one end carrying the weighing hopper and the other end fixed to the main body, a bar fixed to the weighing hopper of the load cell, and a non-measuring device of the measuring device. Clamping means for clamping this bar during operation.

[0010]

According to the above-mentioned structure of the present invention, a weight for calibration is always provided, and a means for moving the weight up and down between the weight pan of the load cell and the weight pan provided above the weight. By providing the control means for controlling the means for moving the weight up and down, the load cell can be automatically configured at each measurement, so that accurate weight measurement can be easily performed without trouble. Furthermore, when the grain weight measuring device is not used, the load fluctuation is not applied to the load cell by clamping the bar material, so that the load cell is less likely to be impacted when the weight measuring device is transported, and the device is prevented from being misaligned. I am trying.

[0011]

[Form of Invention]

The invention is explained in more detail below in the form of examples with reference to the accompanying drawings. Referring to FIG. 1, a rice grain discriminating apparatus provided with the grain weight measuring apparatus of the present invention is schematically illustrated.

This discriminating apparatus has a grain discriminator 1 held above a base 2 by legs 3, and a guide plate 5 arranged around the grain discriminator 1 which is provided along the outer periphery of a rotary plate 4. Grains are conveyed one by one from the defined grain storage unit 6, and the optical quality determination unit 7 determines the grain quality, and the grains are distributed to any of the pipelines 8 according to the grain quality, and the weight measuring device is used. 9
Is introduced into the weighing hopper of each grain weight measuring device 10.
This weight measuring device 9 measures the weight of each grain grain,
Grains are evaluated by obtaining the weight ratio for each grain quality. For example, in the case of brown rice, grains are evaluated by the weight ratio of sizing and reflected in the transaction price.

Referring to FIG. 2, a grain weight measuring apparatus 10 according to an embodiment of the present invention is shown in a side view with a main portion being a sectional view. The weighing hopper 11 that receives the grain from the above-mentioned discriminating device is supported via the beam member 15 to the free end of the load cell 14 supported in the cantilever manner on the base 12 via the pedestal 13. . Weighing hopper 11
Is opened at the top, and the bottom can be opened and closed by the flap gate 16. The flap gate 16 is opened and closed by a hinge mechanism 20 that is oscillated by a motor 18 supported by the base 12 via a gear train 17 and that interlocks with a free end of a doglegged lever 19.

A weight pan 21 having a conical inner bottom surface is fixed to the upper surface of the beam member 15, and the weight pan 21 has:
The bottom of the weight 22 having a conical top and bottom is seated. A weight protection housing 23 is provided above the weight pan 22 and slightly spaced apart from the weight pan 22, and inside the protection housing 23, a weight receiving housing is provided above the conical top of the weight 22 seated on the weight pan 21. 24 are provided in alignment. The weight receiver 24 is slidable in a recess 25 formed on the inner upper surface of the housing 23, and is directed toward the top of the weight 22 by a spring 26 also provided between the inner upper surface and the upper portion of the weight receiver 24. Always biased.

From the upper part of the weight receiver 24, a guide protrusion 27 is formed.
Guide hole 28 that is formed by projecting in the upper portion of the housing 23
It is slidably inserted in. The engagement between the guide protrusion 27 and the guide hole 28 enables the weight receiver 24 to slide smoothly and stably in the recess 25. Further, in order to prevent the weight receiver 24 from falling out of the lower portion of the housing 23, a guide rod 29 protruding from the side portion of the weight receiver 24 is slidable in an elongated hole 30 provided in the side portion of the housing 23. Has been inserted.

From the tip of the conical bottom of the weight 22, the weight 22
A deep hole 31 is provided along the axis of the through hole. The deep hole 31 has a through hole provided in a vertical direction on a horizontal beam 32 stretched between opposed side walls (not shown) provided upright on the base 12. Pins 36 are inserted into the upper end surface of a bar member 35 penetrating 34 and penetrate through holes vertically provided at the bottoms of the beam member 15 and the weight pan 21, respectively. The bar member 35 is composed of a large-diameter lower portion 35a and a small-diameter upper portion 35b, and is a shoulder portion between the large-diameter lower portion 35a and the small-diameter upper portion 35b. Upon receiving the lower end, the bar 35 is always biased downward. A roller 38 is provided on the side surface of the lower portion 35a of the bar 35, and the roller 38 is provided with the long hole 3 provided on the side portion of the lateral beam 32.
It is made movable in the inside 9, so that the bar 35 is prevented from falling off from the cross beam 32.

As clearly shown in FIG. 3, a guide roller 39 is rotatably provided at a lower end portion of the bar member 35 on a shaft 40 protruding laterally. The guide roller is engaged with a side edge of a cam 41 rotatably provided on a side wall (not shown) provided upright on the base 12. Further, the cam 41 meshes with a gear 44 provided on the shaft of a motor 43 via a gear 42 provided coaxially with the cam 41, and is thus rotated by the motor 43. The motor 43 is also fixed to the side wall.

A plate member 45 is fixed to the free end of the load cell 14. The lower portion of the plate member 45 is bent at a right angle from the vertical direction to the horizontal direction, and its free end portion is arranged between the pads 46a and 47a of the upper and lower clamp members 46 and 47. The upper and lower clamp members 46, 47 are bent at a right angle from the horizontal direction to the vertical direction, and the lower end portions thereof are horizontally opposed to each other with a pair of racks 4 interposed therebetween.
It is fixed to 9a and 49b. In addition, these 49a,
49b is slidably fitted to guide shafts 50a and 50b provided upright on the pedestal 50 of the base 12, and when the motor 52 rotates the binion 48, these racks 49a and 49b.
b are vertically movable in the opposite directions along the guide shafts 51a and 51b.

FIG. 4 is a block diagram showing an electric circuit provided in the grain weight measuring device. Load cell 1
The signal from 4 is input to the weight measuring circuit 60, and the weight value of the measured grain is calculated. The control circuit 62 corrects the weight value obtained by this calculation and displays it on the measurement result display device 63. Further, the control circuit 62 receives a signal from a weight position detection switch 61 that is interlocked with the cam 41 to detect whether or not a weight is loaded in the weight pan 31, and the weight calibration described later is performed. Further, the control circuit 61 controls the hopper gate opening / closing motor 18, the weight up / down motor 43, and the clamp drive motor 52 described above.

The measuring operation of the grain weight measuring device will be described below. The measurement start control circuit 62 operates the clamp drive motor 52 to make the load cell 14 in a measurable state, and also operates the hopper gate opening / closing motor 18 to open / close the gate and empty the inside of the weighing hopper 11.
Next, the control circuit 62 operates the weight up / down motor 43. As a result, the cam 41 rotates and the bar 35 is lowered. The drop of the bar 35 is due to free fall, but even when the bar 35 is caught, the force of the spring 37 ensures this drop.

Since the bar 35 descends, the weight 22 is seated on the weight pan 21. The bottom of the weight 22 has a conical shape,
Further, since the inner bottom portion of the weight pan 21 is also a complementary conical shape, the weight 22 is stably swung by the weight pan 21 for the measured value.
In this state, the weight measuring circuit 60 receives the signal from the load cell 14 and calculates the weight value. The weight value obtained here corresponds to the sum of the weight of the weight 22 placed on the weight pan 21 and the weight of the empty weighing hopper 11. Control circuit 62
Stores this weight value, and the weight up / down motor 43
Is operated to rotate the cam 41 to raise the bar 32. As a result, the weight 22 is pushed up and the weight receiver 2
Collide with 4. Since the top of the weight 22 has a conical shape and the inner top of the weight receiver 24 has a complementary conical shape, the weight 22 is
It is stably held in the weight receiver 24. In addition, the weight receiver 24
Is biased to the weight 22 side by the spring 26, so that the weight 22 can be prevented from dancing.

In this state, the weight measuring circuit 60 receives the signal from the load cell 14 and calculates the weight value. The weight value obtained here corresponds to the weight of the empty weighing hopper 11. The control circuit 62 calibrates the load cell 14 by storing this weight value and the previously obtained weight value. As a result, the grain weight measuring device 10 can perform accurate measurement without being affected by the temperature or the adhesion of dust.

Next, when the weighing hopper 11 receives a predetermined amount (or a predetermined number) of grains from the grain discriminator 1, the control circuit 62 receives a signal from the weight measuring circuit 60 and corrects the weight value. , The result is displayed on the measurement result display device 63. Thereby, the weight of the grain in the weighing hopper 11 can be measured. When the measurement is completed, the control circuit 62 operates the hopper gate opening / closing motor 18 to discharge the grain from the weighing hopper 11, and further the clamp drive motor 52.
To keep the load cell 14 in the non-measurement state.

[0024]

As described above, according to the present invention, a mechanism for automatically moving the weight up and down is provided, so that the load cell can be automatically calibrated at each measurement without any trouble, so that the weight of the grain can be accurately measured. Further, by providing the clamp mechanism that holds the load cell in the non-measurement state during non-measurement, it is possible to prevent the load cell from being subjected to an unreasonable load or impact during transportation.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a grain discrimination device to which a grain weight measuring device of the present invention is applied.

FIG. 2 is a partial cross-sectional side view of the grain weight measuring device of the present invention.

FIG. 3 is a view taken along the line AA of FIG.

FIG. 4 is a block diagram showing an electric circuit diagram of the grain measuring device of the present invention.

[Explanation of symbols]

 11 Weighing hopper 14 Load cell 21 Weight plate 22 Weights 24 Weight receiver 35-43 Weight up / down means 45 Clamp plate 47-58 Clamp drive means

Claims (2)

[Claims] 1. A main body, a load cell held by the main body in a cantilever manner, a weighing hopper provided at a free end of the load cell, a weight pan provided on the load cell, and a weight pan aligned with the weight pan. And a weight receiver provided above, an elastic means for biasing the weight receiver toward the weight pan, and a moving means for displacing the weight between the weight pan and the weight receiver. apparatus. 2. A main body, a load cell held by the main body in a cantilever manner, a weighing hopper provided at a free end of the load cell, a plate member having one end fixed to the free end of the load cell, and the plate member. A grain weight measuring device provided with a clamp means for clamping the other end of the and a means for driving the clamp means.