JP2022127828A - Charging device and metering device with the same - Google Patents

Abstract

To provide a charging device capable of accurately charging an object to be weighed in a charge chute by rotating a cut gate.SOLUTION: In a charging device, a lower end opening of a charge chute 22 for storing an object to be weighed is opened/closed by a cut gate 21 rotationally driven by a stepping motor 31. The cut gate 21 comprises: an arc-shaped shutter part 21a facing along the lower end opening of the charge chute 22; and a pair of arm parts 21b extending upward from both ends of the shutter part 21a. The arm part 21b is formed with a through-hole 33.SELECTED DRAWING: Figure 4

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feeding device suitable for feeding mainly powdery or granular objects to be weighed into a weighing device and a weighing device provided with the same.

As a weighing device, for example, as shown in Patent Document 1, a large input weighing hopper roughly weighs an object whose weight is less than a target weight, and a small input weighing hopper is used to compensate for the shortage of the target weight. A configuration is known in which the objects to be weighed and discharged from the respective weighing hoppers are collected to have a target weight and supplied to a bagging device or the like.

JP 2017-154837 A

In Patent Document 1, the control of the amount of the object to be weighed into the weighing hopper is configured to control the opening degree of the lower end opening of the charging chute to which the object to be weighed is supplied by a cut gate. There is room for improvement in controlling the cut gate with high precision by a motor with a small output, such as a stepping motor.

Further, in the weighing device, cleaning of the device is frequently performed relatively frequently, and it is desired that the charging chute or the like for charging the objects to be weighed can be easily attached and detached.

SUMMARY OF THE INVENTION The present invention has been made in view of such a point, and its main object is to allow objects to be weighed on a charging chute to be accurately charged by turning a cut gate.

In order to achieve the above object, the present invention is configured as follows.

(1) A loading device according to the present invention is a loading device for loading an object to be weighed by opening and closing a lower end opening of a loading chute to which the object to be weighed is supplied by a cut gate that rotates around a horizontal fulcrum,
A stepping motor is provided to rotate and drive the cut gate, and the cut gate includes arcuate shutters facing along the lower end opening of the input chute and upward from both side ends of the shutters to the horizontal fulcrum. A pair of extended arm portions are provided, and through holes are formed in the arm portions.

According to the loading device according to the present invention, the cut gate can be controlled to open and close with high accuracy by pulse-controlling the stepping motor, and the object to be weighed is loaded with a simple and inexpensive configuration without using a servomechanism. be able to.

Further, since the arm portion of the cut gate is formed with a through hole, the weight can be reduced and the inertial force at the time of opening and closing can be reduced. As a result, the cut gate can be controlled to open and close at high speed with high accuracy by a motor with a small output such as a stepping motor.

(2) In a preferred aspect of the present invention, the opening shape of the through hole of the arm portion is such that the width of the opening increases from the horizontal fulcrum side toward the shutter portion side.

According to this embodiment, the opening width of the through hole of the arm portion is widened from the horizontal fulcrum side, which is the center of rotation, toward the shutter portion, which is the outer side. can be effectively reduced.

(3) In one embodiment of the present invention, the cut gate and the stepping motor are interlocked with each other via a transmission intermittent section, and the input chute is detachably connected to and supported by a fixed support frame. .

According to this embodiment, the transmission interrupter is interposed in the transmission system between the cut gate and the stepping motor, while the input chute is detachable from the support frame. As such, it can be easily installed and removed.

(4) In another embodiment of the present invention, the support shaft of the cut gate and the output shaft of the stepping motor are interlocked and connected via a coupling that can be separated in the axial direction.

According to this embodiment, by moving the cut gate that opens and closes the lower end opening of the charging chute along the direction of the horizontal fulcrum, which is the rotational fulcrum of the cut gate, the connection with the stepping motor can be easily interrupted, When cleaning or the like, the cut gate can be quickly attached and detached.

(5) In still another aspect of the present invention, the support shaft of the cut gate and the output shaft of the stepping motor are interlocked via a link mechanism.

According to this embodiment, the relationship between the cut gate and the stepping motor can be changed by the link mechanism, so the degree of freedom in design is improved.

(6) A weighing apparatus according to the present invention includes a loading device according to any one of (1) to (5) above, and a weighing hopper into which the objects to be weighed are loaded from the loading device.

According to the weighing device of the present invention, the opening and closing of the cut gate of the loading device can be controlled with high accuracy, so the objects to be weighed can be loaded into the weighing hopper with high accuracy.

Thus, according to the present invention, the cut gate can be controlled to open and close with high accuracy by pulse-controlling the stepping motor, and the object to be weighed can be thrown in with a simple and inexpensive configuration without using a servomechanism. It can be carried out.

Further, since the arm portion of the cut gate is formed with a through hole, the weight can be reduced and the inertial force at the time of opening and closing can be reduced. As a result, the cut gate can be controlled to open and close at high speed with high accuracy by a motor with a small output such as a stepping motor, and the objects to be weighed can be thrown in with high accuracy.

FIG. 1 is an overall perspective view of a weighing device according to an embodiment of the present invention, viewed from the coarse weighing section side. FIG. 2 is an overall perspective view of the weighing device of FIG. 1 as seen from the precision weighing unit side. FIG. 3 is a side view showing the loading device of the coarse weighing section. FIG. 4 is a perspective view showing the loading device of the coarse weighing section. FIG. 5 is a side view showing the separating state of the charging chute and the cut gate. FIG. 6 is a perspective view showing another embodiment of the coupling. FIG. 7 is a perspective view showing still another embodiment of the injection device. FIG. 8 is a side view showing another embodiment of the dosing device.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

1 and 2 are perspective views of a weighing device according to one embodiment of the present invention.

The weighing device of this embodiment mainly weighs and discharges a powder-like object to be weighed by a predetermined weight. A rough weighing section A performs rough weighing less than the target weight, and a precise weighing section B precisely combines and weighs the shortfall to the target weight.

In the rough weighing section A, a center base 2 having a hollow structure arranged above the base 1, three feeding devices 3 mounted in parallel on the center base 2, and a center base 2 facing below each feeding device 3 three weighing hoppers 4 mounted on the outer periphery of the base 1, and a collecting chute 5 for guiding the objects to be weighed discharged from each weighing hopper 4 toward the center of the base 1. .

In the precision weighing unit B, a center substrate 6 having a hollow structure disposed above the base 1, a dispersing feeder 7 having a semicircular planar shape and provided at the center of the upper part of the center substrate 6, and above the distributing feeder 7 An input funnel 8 having a semicircular planar shape and a large number (14 in this example) of linear feeders 9 radially mounted on the upper part of the center substrate 6 surrounding the dispersion feeder 7 are provided. .

Further, in the precision weighing unit B, a large number of supply hoppers 10 are provided on the outer periphery of the center base 6 so as to face the lower outer ends of the linear feeders 9, and the center bases 10 are positioned below the supply hoppers 10. A large number of weighing hoppers 11 are provided on the outer periphery of the base 6, and a collection chute 12 for guiding the objects to be weighed discharged from each weighing hopper 11 toward the center of the base 1, and the like.

The center substrate 2 for the coarse weighing unit and the center substrate 6 for the precise weighing unit are connected at their back sides and placed above the base 1 via legs 13 . Also, the input funnel 8 is supported by the center base 6 via the support frame 14 .

Although not shown, a supply conveyor for conveying the objects to be weighed is provided above the input funnel 8 in the precision weighing section B, and the objects to be weighed are supplied to the distributed feeders 7 from this supply conveyor.

In addition, each loading device 3 of the rough weighing section A is always supplied with the objects to be weighed from a large storage hopper (not shown) above through a supply chute.

The objects to be weighed that are flow-guided by the collecting chute 5 of the coarse weighing section A and the collecting chute 12 of the precise weighing section B are collected in a collecting hopper (not shown) arranged below the center of the base 1 and not shown. By controlling the opening of the collection hopper based on the discharge request command from the bagging device, the objects to be weighed in a predetermined weight range based on the target weight discharged from the collection hopper are discharged and supplied to the bagging device.

3 is a side view showing the charging device of the coarse weighing section A, FIG. 4 is a perspective view thereof, and FIG. 5 is a side view showing the separated state of the charging chute and the cut gate.

The charging device 3 according to the embodiment of the present invention includes a charging chute 22 formed in a rectangular tubular shape, a cut gate 21 for opening and closing the lower end opening of the charging chute 22, and a stepping motor 31 for rotationally driving the cut gate 21. and are basically provided.

In the loading device 3, the cut gate 21, which rotates forward and backward about the horizontal fulcrum p, is controlled to open and close at a predetermined opening degree to load the objects to be weighed into the weighing hopper 4. The weight of the object to be weighed is weighed by a weighing hopper 4, and the object to be weighed whose weight is less than the target weight is roughly weighed and discharged from the weighing hopper 4. - 特許庁

In the precise weighing section B, the shortfall of the rough weight weighed in the rough weighing section A to the target weight is weighed and discharged. The objects to be weighed supplied to the distributed feeder 7 are vibrationally conveyed outward and supplied to the linear feeders 9, and the supplied objects to be weighed are further vibrationally conveyed outward by the linear feeders 9 and supplied. It is fed into the hopper 10.

The objects to be weighed in the supply hopper 10 are supplied to the weighing hopper 11 and weighed by the weighing hopper 11 . Based on the weight of the object to be weighed in each weighing hopper 11, a combination calculation is performed to select a combination of weighing hoppers 11 that provide the weight of the shortfall to the target weight, and the weight of the shortfall is obtained from the selected weighing hoppers 11. The object to be weighed is discharged. Then, the objects to be weighed from the rough weighing section A and the objects to be weighed from the precise weighing section B are assembled and discharged as the objects to be weighed within a predetermined weight range based on the target weight.

In this way, the coarse weighing section A performs rough weighing close to the target weight, and the precision weighing section B accurately weighs the shortfall of the rough weighing value with respect to the target weight by combination weighing, and the weight from the rough weighing section A is measured. By gathering the objects to be weighed and the objects to be weighed from the precision weighing section B, it is possible to discharge the objects to be weighed in a predetermined weight range based on the target weight weighed with high accuracy.

In the rough weighing section A, weighing is carried out independently using three charging devices 3 and weighing hoppers 4, and the objects to be weighed are sent from the rough weighing section A without delaying the discharge timing of the precise weighing section B. Ejection takes place. That is, an object to be weighed whose weight is less than the target weight is charged from the charging device 3 at one end of the three units of the rough weighing section A, and the shortage of the target weight is weighed and discharged by the precision weighing section B. do. Next, an object to be weighed whose weight is less than the target weight is charged from the central charging device 3 of the three coarse weighing units A, and the precise weighing unit B weighs and discharges the shortfall of the target weight. Next, an object to be weighed whose weight is less than the target weight is charged from the charging device 3 at the other end of the three units of the rough weighing section A, and the precise weighing section B weighs and discharges the shortage of the target weight. In this way, by sequentially throwing the objects to be weighed from the three feeding devices 3, the corresponding weighing from the next feeding device 3 can be performed without waiting for the weighing stabilization time in the weighing hopper 4 into which the objects to be weighed are fed. The object to be weighed can be put into the hopper 4, and high-speed weighing and discharge is possible.

Next, the loading device 3 for the objects to be weighed in the coarse weighing section A will be described in more detail. In the following description, the center side of the weighing device is called the inside or the inside, the side away from the center of the weighing device is called the outside (or outside), and the horizontal direction orthogonal to the inside and outside direction is called the left-right direction.

The input device 3 of the coarse weighing unit A is configured to open and close the lower end opening of a rectangular tube-shaped input chute 22 by a cut gate 21 that rotates around a horizontal fulcrum p along the inward and outward directions. Objects to be weighed are dropped and supplied to the input chute 22 from an upper large storage hopper (not shown) via the supply chute, and the input chute 22 is in a state of storing the objects to be weighed.

The charging chute 22 of the charging device 3 is arranged between a pair of left and right support frames 23 provided on the center base 2 and extending outward in a cantilevered manner, and is detachably supported.

More specifically, each support frame 23 is provided with fastening metal fittings 24 made of snap locks, and rectangular engaging metal fittings 25 are fixed to the left and right outer side surfaces of the charging chute 22 . A rectangular engagement recess 26 that opens outward is formed at the tip of the support frame 23 . The engaging fitting 25 of the charging chute 22 inserted between the left and right support frames 23 is engaged to the deep end of the engaging recess 26 , and the locking portion of the fastening fitting 24 is engaged with the hook 27 provided on the engaging fitting 25 . 24a. By swinging the operating lever 24b of the fastening member 24 inward beyond the dead point, the charging chute 22 can be positioned on the support frame 23 and tightened and fixed. Further, the locking portion 24a can be disengaged from the hook 27 by swinging the operating lever 24b outward beyond the dead point.

The cut gate 21 is provided with an arc-shaped shutter portion 21a along the arc-shaped lower end of the charging chute 22, and fan-shaped arm portions 21b extending upward from both inner and outer ends of the shutter portion 21a. is rotatably attached to the charging chute 22 so that the center of curvature of is coincident with the horizontal fulcrum p.

A support shaft 30 protrudes inward along a horizontal fulcrum p from the upper portion of one of the arms 21b positioned inside, and an output shaft 31a extends horizontally outward on the upper surface of the center base 2. A stepping motor 31 is installed facing toward. The output shaft 31a of the stepping motor 31 and the support shaft 30 of the cut gate 21 are concentrically butted against each other, and are separably interlocked via an Oldham type coupling (transmission intermittent portion) 32. As shown in FIG.

In this manner, the output shaft 31a of the stepping motor 31 and the support shaft 30 of the cut gate 21 are concentrically butted and connected via the coupling 32 in a separable manner. Since it is detachably supported by a pair of left and right support frames 23 provided on the center base 2 by fasteners 24 and engaging metal fittings 25, as shown in FIG. , can be removed from the center base 2 by moving it horizontally outward, while the input chute 22 and the cut gate 21 can be moved horizontally inward and attached to the center base 2 as a unit, thereby facilitating cleaning and maintenance. In some cases, the charging chute 22 and the cut gate 21 can be quickly attached and detached from the center base body 2 .

Through-holes 33 are punched through the arm portions 21b inside and outside the cut gate 21, respectively. In this embodiment, the arm portion 21b is formed with two through holes 33, and each through hole 33 has a narrow opening width on the side of the horizontal fulcrum p, which is the turning fulcrum of the cut gate 21, and the opening of the shutter 21b is narrow. The width of the opening on the side of the portion 21a is widened.

Since the through hole 33 is formed in the arm portion 21b in this manner, the weight of the rotating cut gate 21 as a whole can be reduced, and the inertial force when opening and closing the cut gate 21 can be reduced. As a result, even with the stepping motor 31 having a small output, the cut gate 21 can be rotated quickly and accurately with high positional accuracy.

[Other embodiments]
The present invention can also be implemented in the following forms.

(1) As shown in FIG. 6, as a transmission interrupting portion for interrupting interlocking between the support shaft 30 of the cut gate 21 and the output shaft 31a of the stepping motor 31, a simple pin 35 and an engagement slot 36 are used. Any other engaging structure can also be used.

(2) As shown in FIG. 7, the cut gate 21 of the charging chute 22 and the stepping motor 31 are interlocked by a rotary link mechanism 37, and the rotary link mechanism 37 is provided with a wing bolt 38 to provide a separable transmission intermittence. A section may be provided so that the interlocking connection between the cut gate 21 and the stepping motor 31 can be intermittently operated without a tool when the input chute 22 is detached.

(3) As shown in FIG. 8, if the lower side portion 23a of the engaging recess 26 formed in the support frame 23 is extended outward, the engaging fitting 25 of the charging chute 22 is once extended to the extension of the lower side portion 23a. After temporarily placing the charging chute 22 on the site, it can be properly pushed into the engaging recess 27 and engaged, thus facilitating the operation of positioning and mounting the heavy charging chute 22 to the support frame 23. .

(4) Contrary to the above embodiment, the engagement recess 26 and the fastener 24 are provided on the input chute 22 side, and the engagement fixture 25 that engages with the engagement recess 26 is provided on the support frame 23 side. is also possible.

3 Input device 4 Weighing hopper 21 Cut gate 21a Shutter part 21b Arm part 22 Input chute 23 Support frame 24 Fastener 24b Operation lever 25 Engagement fitting 26 Engagement recess 30 Support shaft 31 Stepping motor 31a Output shaft 32 Coupling 33 Through hole A Coarse weighing section B Precision weighing section

Claims (6)

A charging device for charging an object to be weighed by opening and closing a lower end opening of a charging chute to which the object to be weighed is supplied by a cut gate rotating around a horizontal fulcrum,
A stepping motor for rotating the cut gate,
The cut gate includes arcuate shutter portions facing each other along the lower end opening of the input chute, and a pair of arm portions extending upward from both side ends of the shutter portion to the horizontal fulcrum, A through hole is formed in the arm portion,
An injection device characterized by: The opening shape of the through hole of the arm portion is such that the width of the opening increases from the horizontal fulcrum side to the shutter portion side.
Dosing device according to claim 1. The cut gate and the stepping motor are interlockingly connected via a transmission intermittent section, and the input chute is detachably connected to and supported by a fixedly arranged support frame.
Dosing device according to claim 1 or 2. The support shaft of the cut gate and the output shaft of the stepping motor are interlocked via a coupling that can be separated in the axial direction,
Dosing device according to claim 3. a support shaft of the cut gate and an output shaft of the stepping motor are interlocked and connected via a link mechanism;
Dosing device according to claim 3. A loading device according to any one of claims 1 to 5, and a weighing hopper into which the object to be weighed from the loading device is loaded,
A weighing device characterized by:

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