JP3355428B2 - Combination weighing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combination weighing apparatus for discharging articles having different weights in a desired amount.

[0002]

2. Description of the Related Art A combination weighing apparatus has been conventionally used in order to efficiently discharge a food or the like having a weight variation individually in a target amount. The combination weighing device supplies the objects to be weighed such as food to a plurality of weighing hoppers, weighs each, and selects a combination close to or equal to the target amount based on the weighing result by each weighing hopper, and selects the combination. The objects to be weighed are discharged from the weighing hopper, and the discharged objects to be weighed are collectively collected and discharged from a predetermined position.

In this type of weighing device, a funnel-shaped collecting chute is used to collect and discharge the objects to be weighed discharged from the weighing hopper in a selected combination to a predetermined position. When collecting and discharging the objects to be weighed, a collecting chute having a gentle inclination of the inner wall can be used.Therefore, a plurality of weighing hoppers are arranged in a ring along the edge of the collecting chute having a large upper opening surface. Was.

However, when collectively discharging an object to be weighed containing water or oil and having adhesive properties, if a collecting chute having a wide upper opening surface and a sloping inner wall is used, the object to be weighed adheres to the inner wall. As a result, the amount of the object to be weighed, which is selected in combination, differs from the amount of the object to be weighed actually discharged from the collecting chute, so that accurate weighing cannot be performed.

As a technique for solving this problem, Japanese Patent Laid-Open Publication No.
No. 63630 discloses that a weighing hopper and a pool hopper for supplying an object to be weighed to each weighing hopper are formed in a cylindrical shape to prevent an adhesive object to be weighed from remaining in the hopper, Place a table-like collecting board in
The objects to be weighed discharged from each weighing hopper onto the collecting plate are gathered at the center of the collecting plate by a pair of scrapers slidable on the collecting plate, and dropped into the opening surface of the collecting chute with a small diameter and a steeply inclined inner wall. Is disclosed.

[0006]

However, after the objects to be weighed discharged from the weighing hopper are dropped on the table-like collecting plate, a pair of scrapers are slid to move the objects to be weighed on the collecting plate. In the method of collecting the objects at the center and dropping them into the collecting chute, the driving mechanism of the scraper becomes large, and the next object to be weighed cannot be discharged unless the pair of scrapers is returned to the original position. There was a problem of lowering.

SUMMARY OF THE INVENTION An object of the present invention is to provide a combination weighing device which solves this problem and which can collectively discharge sticky articles with a simple structure without lowering the operation efficiency.

[0008]

In order to solve the above-mentioned problems, a combination weighing apparatus according to the present invention supplies an object to be weighed to a plurality of cylindrical weighing hoppers arranged linearly in a horizontal direction, and supplies each weighing object. Of the objects weighed by the hopper, the objects selected based on the measurement result are discharged from the weighing hopper, and
Disposed objects to be weighed are arranged below the plurality of weighing hoppers
Received on the conveyor belt surface and transported to one end
The object to be weighed carried out from one end of the conveyor is
A funnel-shaped collecting shell located below one end of the conveyor
From the upper opening of the heat sink and drain from the lower outlet.
In the combination weighing device to be put out, the upper edge of one surface extending in the width direction of the conveyor is disposed between the edge of the upper opening surface of the collecting chute on the conveyor side and the lower surface of one end of the conveyor. A return restricting body which is moved close to the belt on the lower surface at one end of the conveyor to restrict the movement of the object to be measured attached to the belt on the lower surface at one end of the conveyor to the other end; When an object is carried out from one end side, a drive device is provided to move the return regulating body inward of the collecting chute to stop and then return to the original state.
Only to have.

[0009]

With such a configuration, in the combination weighing device of the present invention, the objects to be weighed selected and discharged from the combinations of the objects to be weighed by the plurality of cylindrical weighing hoppers arranged in a straight line are discharged. Falls on a conveyor belt placed below it, is conveyed to one end of the conveyor, and is scraped from the one end as it is or by the upper edge of the return restrictor, and falls into the collecting chute. It is discharged from the outlet of the collecting chute. Also, the return restrictor moves inward of the collecting chute.
After moving and stopping, it is returned to its original state.
The object to be weighed attached to the body also falls into the collecting chute.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 7 show the appearance of a combination weighing apparatus 20 according to an embodiment for weighing an adhesive object to be weighed and the schematic structure of each part. In these drawings, a substantially rectangular parallelepiped casing 22 is placed on a base 21 of the combination weighing device 20.
Is supported. A plurality (10 in this example) of electromagnetic vibration devices 23 are arranged in a row in the width direction of the housing 22 at an upper portion in the housing 22.
3 a protrudes from the upper surface 22 a of the housing 22.

At the upper end of each vibration shaft 23a, a trough-shaped transport trough 24 is attached so as to face the front of the housing 22. The objects to be weighed are supplied to each of the transport troughs 24 by a chute, a bucket conveyor, or a manual input (not shown).

Each of the vibrating devices 23 vibrates each of the transport troughs 24 back and forth toward the front side of the housing 22 slightly upward by energizing for a predetermined time, and vibrates and conveys the objects to be weighed on the transport trough 24 to the front end side. I do.

Below the front end of each transport trough 24, a pool hopper 25 in the form of a hollow square tube whose upper and lower sides are opened in a substantially rectangular shape.
Are arranged respectively. The pool hopper 25 is shown in FIG.
As shown in the figure, a flange 26 is formed at the front and rear edges of the lower opening slightly smaller than the upper opening, and two locking holes are formed in one flange 26. 27 are provided.

Each pool hopper 25 is provided on the front surface 2 of the housing 22.
2b is supported by a frame 28 attached to the left and right sides. That is, five pin fixing plates 29 are attached to the inside of the front plate 28 a of each frame 28 at predetermined intervals, and each pin fixing plate 29 has the same locking hole 27 as the pool hopper 25. Two locking pins 31 are erected at intervals.
A pair of guide shafts 32 are respectively installed between the front plate 28a of the frame body 28 and the front surface 22b of the housing 22 in parallel on both sides of the pair of locking pins 31.
Bottom plates 33 are respectively supported on the top. Each bottom plate 33 is engaged with one of the guide shafts 32 on the back side thereof,
It is slidably supported in the front-rear direction.

Each pool hopper 25 has a pair of locking pins 3.
In a state where the locking hole 27 is locked to the first support plate 1, it is supported so as to be placed on the bottom plate 33.

Each bottom plate 33 is formed in a substantially rectangular shape large enough to close the lower opening surface of the pool hopper 25, and a rear portion of one side thereof has a cylinder shaft 34 a projecting from the front surface 22 b of the housing 22. It is detachably connected to the tip. Each cylinder 34 provided in the housing 22 draws the cylinder shaft 34a until the front end of the bottom plate 33 is below the rear flange of the pool hopper, and opens the lower opening surface of each pool hopper. The cylinder shaft 34a is pushed out until the front end of 33 is below the front flange of the pool hopper, and the lower opening surface of each pool hopper 25 is closed.

Below each pool hopper 25, a weighing hopper 35 having the same shape as the pool hopper 25 is disposed.

Each of the weighing hoppers 35 is supported so that the front and rear directions of the weighing hoppers 35 are opposite to those of the pool hoppers 25. As shown in FIG.
7 is supported by each hopper support 40 supported on the front surface 22 b of the housing 22.

On the upper surface of the hopper support 40, two locking pins 41 are protruded, and at both ends of the hopper support 40,
A pair of guide shafts 42 extending parallel to the front at a slightly wider interval than the locking pins 41 is attached, and is guided on the guide shafts 42 by the pair of guide shafts 42 in the front-rear direction. Slidable bottom plates 43 are respectively supported. Each of the weighing hoppers 35 has a bottom plate 43 with the locking holes 37 locked by a pair of locking pins 41.
It is supported so as to be placed on the top.

Each bottom plate 43 is a bottom plate 3 of the pool hopper 25.
3 is formed in a rectangular shape large enough to close the lower opening surface of the weighing hopper 35, and the rear portion of one side is detachably attached to the tip of a cylinder shaft 44a protruding from the front surface of the housing 22. Are linked. Each cylinder 44 provided in the housing 22 pushes out each cylinder shaft 44a, moves each bottom plate 43 forward, opens the lower opening surface of each weighing hopper 35, and retracts each cylinder shaft 44a. Each bottom plate 4
3 is moved to the housing side to close the lower opening surface of each weighing hopper 35.

Each of the hopper supports 40 is detachably connected to a disc-shaped connecting plate 45 disposed on the front surface of the housing 22 via a locking mechanism 46. Each connecting plate 45
Each of the cylinders 44 is also fixed to the connection plate 45, and is supported by each load cell 47 fixed in the housing. It protrudes forward.

Therefore, each of the load cells 47 includes the weighing hopper 35, the hopper support 40, the guide shaft 42, and the bottom plate 4
3. The load of the cylinder 44, the connecting plate 45, and the locking mechanism 46 is constantly applied, and the load by the object to be weighed is added to this steady load.

Below each weighing hopper 35, a timing hopper 50 having the same shape as the pool hopper 25 is disposed.

Each timing hopper 50 is supported on the front side of the housing 22 just like the pool hopper 25.
That is, as shown in FIG.
Two locking holes 5 provided in one flange 51 at the lower end of
2 is a frame 5 fixed to the left and right of the front surface 22 b of the housing 22.
A pair of guides, which are locked by locking pins 56 projecting from the pin fixing plate 54 at the inner edge of the front plate 53a of the third frame 53, and are installed in parallel between the front plate 53a of the frame 53 and the front surface of the housing. It is mounted on a bottom plate 59 that is supported on a shaft 58 and slides back and forth.

Each bottom plate 59 is formed in a rectangular shape having a size to cover the lower opening surface of the timing hopper 50, and the rear side of one side thereof is formed at the tip of a cylinder shaft 60 a projecting from the front surface of the housing 22. It is detachably connected. Case 22
Each of the cylinders 60 in the inside draws in each of the cylinder shafts 60a, moves each of the bottom plates 59 to the housing 22 side, opens the lower opening surface of each of the timing hoppers 50, and pushes out each of the cylinder shafts 60a to make each of the bottom plates 59 Is moved forward to close the lower opening surface of each timing hopper 50.

Below the plurality (ten in this embodiment) of the timing hoppers 50, two conveyors 65 and 66 are arranged on the left and right. The left conveyor 65 is the left 5
The right conveyor 66 receives the objects to be weighed discharged from the timing hoppers and conveys them to the left end after receiving the objects to be weighed discharged from the five right hoppers.

The two conveyors 65 and 66 are supported by the front surface 22b of the housing 22, and are driven by a motor 67 in the housing. A funnel-shaped collecting chute 70 is supported below the two conveyors 65 and 66.

The collective chute 70 is, as shown in FIG.
A rectangular opening surface 71 of a minimum size necessary for receiving the objects to be weighed carried out from the ends of the conveyors 65 and 66 is provided at an upper portion, and a discharge port 72 is provided at a lower portion. The slope of the inner wall surface is so steep that the adhered object to be weighed can be discharged from the discharge port 72.

The collecting chute 70 is mounted on the front surface 22 of the housing 22.
A pair of support members 73 protruding forward from b in parallel to each other supports it in such a manner that it can be pulled out forward. A long plate-like shape is provided between the left edge of the upper opening surface 71 of the collecting chute 70 and the lower surface of the right end of the conveyor 65 and between the right edge of the upper opening surface 71 and the lower surface of the left end of the conveyor 66. Return control plates 75 and 76 are arranged along the width direction of each conveyor.

The return restricting plates 75 and 76 are thin rectangular and have a length substantially equal to the belt width of the conveyors 65 and 66.
A pair of rotating shafts 80, 81 whose lower edges 75 b, 76 b protrude forward from the front surface of the housing 22 in parallel in a state of being close to (almost in contact with) the belt on the lower surface side of 66.
It is fixed to.

The rotation shafts 80 and 81 are controlled by motors 82 and 83 provided in the housing 22 to return control plates 75 and 76.
Is driven to rotate a predetermined angle inward of the collecting chute 70 and return to the original position. Motors 82, 8
Reference numeral 3 denotes a drive unit of this embodiment together with a control unit (not shown). When the objects to be weighed on the conveyors 65 and 66 are discharged from the end on the collecting chute 70 side, return control plates 75 and 76 Is rotated.

The control unit (not shown) of the combination weighing device 20 detects the weight of the object to be weighed supplied to each weighing hopper from the output signal of each load cell 47 described above, and sets the weight in advance based on the weight value. In addition to selecting a combination of objects to be weighed that is close to or equal to the target weight, the vibration devices 23, the cylinders 34, 44, 60, the conveyors 65, 66, and the motors 82, 83 are controlled and selected. The object to be weighed is discharged, and the object to be weighed is supplied to each empty hopper.

Hereinafter, the operation of the combination weighing device will be described. In advance, all transport troughs 24, pool hoppers 25,
An object to be weighed is supplied to the weighing hopper 35,
It is assumed that the weight of the object to be weighed supplied to 5 is detected. Here, a combination of objects to be weighed whose total weight value is close to or equal to a preset target weight is selected.

Then, the cylinders 44 corresponding to the weighing hoppers containing the objects to be weighed selected in the combination are driven, and their respective cylinder shafts 44a move forward,
The bottom plate 43 closing the lower surface of the weighing hopper 35 moves forward, and the objects to be weighed selected in the combination are discharged to the corresponding timing hoppers 50 as shown in FIG. In FIG. 7, the pool hopper is omitted, and the objects to be weighed are indicated by oblique lines.

When the weighing hopper 35 becomes empty, the bottom plate 33 of the corresponding pool hopper 25 slides toward the front side of the housing 22, and a new object to be weighed is emptied as shown in FIG. It is supplied to a hopper and weighed. When the pool hopper 25 becomes empty, the corresponding transport trough 24 is driven to vibrate, and a new object to be weighed is supplied to the empty pool hopper to prepare for the next supply to the weighing hopper.

During this time, for example, when a discharge request signal is input from the outside, the conveyors 65 and 66 are driven at the same speed toward the collecting chute 70 by almost half a turn, and are closer to the timing hopper farther from the collecting chute 70. To the conveyor 65, 66 in order according to the speed,
Each time a timing hopper containing an object to be weighed is designated, the timing hopper is opened and closed. That is, as shown in (c), (d), and (e) of FIG. 7, the objects to be weighed are discharged in order from the timing hopper farthest from the collecting chute 70 (the timing hopper at the left end and the right end), and selected as a combination. The collected objects to be weighed are conveyed to the collecting chute 70 side while being gathered together on the two conveyors 65 and 66 (this discharge is performed by opening the bottom plate only for the timing hopper containing the objects to be weighed). However, the bottom plate may be opened in order regardless of the presence or absence of the object to be weighed).

Most of the objects to be weighed discharged onto the conveyors 65 and 66 are carried out from the ends of each of the conveyors 65 and 66 and fall into the collecting chute 70. As shown in FIG. 8A, the toner adheres to the belt surfaces of the conveyors 65 and 66 and moves to the lower surface side. However, the upper edges 75a, 7 of the return regulating plates 75, 76
Since the reference numeral 6a is located almost in contact with the belt on the lower surface side of the conveyor, the objects to be weighed around the lower surface side are scraped off from the belt and fall into the collecting chute 70.

At approximately the same time as the driving of the conveyors 65 and 66 is stopped (or after the conveyor is stopped), FIG.
As shown in (b), when the motors 82 and 83 are driven and the return regulating plates 75 and 76 rotate a predetermined angle inward of the collecting chute 70 and return to the original position, they rotate toward the lower surface of the conveyor. The rest of the objects to be weighed and the return regulating plates 75, 76
The object to be weighed which adheres to the collecting chute 70 also falls.

Therefore, the objects to be weighed selected in the combination are all discharged into the collecting chute 70 without remaining on the conveyors 65 and 66 and without falling outside the collecting chute 70. It is discharged from the outlet 72.

When the bottom plates of the two inner timing hoppers closest to the collecting chute 70 return to their original positions, the objects to be weighed in combination during that time are discharged from the weighing hopper to the corresponding timing hopper, and the next discharge request is made. Prepare.

Thereafter, the objects to be weighed and selected in combination in the same manner by the respective weighing hoppers 35 are transferred to the timing hopper 50.
Are discharged onto the conveyors 65 and 66 via the conveyor and returned into the collecting chute 70 by the conveyance and return regulating plates 75 and 76 of the conveyors 65 and 66.

Thus, by providing the return regulating plate between the lower surface of the conveyor and the edge of the upper opening surface of the collecting chute, the sticky articles can be discharged into the collecting chute without remaining. The structure is simpler than the conventional collective discharge operation using a scraper,
In addition, the objects to be weighed selected in combination can be efficiently discharged collectively.

[0043]

[Other Embodiments] In the above embodiment, the objects to be weighed, which are weighed by the respective weighing hoppers 35 and selected as a combination, are discharged to the conveyor via the timing hopper 50. However, the timing hopper is not provided. The object to be weighed may be directly discharged from the weighing hopper to the conveyor.

In the above-described embodiment, the objects to be weighed selected in the combination are assembled using two conveyors.
A single conveyor receives the objects to be weighed discharged from all the weighing hoppers, or the weighing hopper is divided into three or more sets, and three objects to be weighed are discharged from each set of weighing conveyors. You may make it receive by the above conveyor.

Further, in the above-described embodiment, the return regulating plates 75 and 76 having one flat surface are used. However, as in the case of the return regulating body 90 shown in FIG. May be prevented from adhering to the object. Further, as shown in FIG. 10, for example, not only a plate-shaped return restricting body but also a triangular prism-shaped (or square-shaped) return restricting body 91 may be used, and this may be 120 degrees (in the case of a square prism, for example). (90 degrees each). In this case, the return drive of the return restricting body is unnecessary or slight.

In the above embodiment, the case where the return restricting body is driven to rotate has been described. However, the movement of the return restricting body is not limited to the rotational movement, and the entire return restricting body is moved in parallel to the inside of the collecting chute. Is also good.

In the above embodiment, the return regulating plate 75,
Although 76 is supported on the housing side, the return restricting body may be supported on the edge of the upper opening surface of the collecting chute.

[0048]

As described above, the combination weighing apparatus according to the present invention places a combination-selected object to be weighed, which is weighed by a plurality of cylindrical weighing hoppers linearly arranged in a horizontal direction, below the weighing hopper. It is formed so as to be discharged onto the placed conveyor and discharged from one end thereof to the collecting chute, and an upper edge is provided between the lower surface of one end of the conveyor and the edge of the upper opening surface of the collecting chute on the conveyor side. A return regulating body is provided so that the part is close to the belt on the lower surface of the conveyor, and when the object to be weighed is discharged from one end of the conveyor to the collecting chute, the return regulating body is moved inward of the collecting chute and stopped. Let
After returning to the original state, it is possible to discharge sticky objects to the collecting chute with a simple structure, and to achieve high operation efficiency and highly accurate weighing. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of an embodiment of the present invention.

FIG. 2 is a front view of one embodiment.

FIG. 3 is a side view of one embodiment.

FIG. 4 is a perspective view of a main part of one embodiment.

FIG. 5 is a perspective view of a main part of one embodiment.

FIG. 6 is a perspective view of a main part of one embodiment.

FIG. 7 is a schematic diagram for explaining the operation of one embodiment.

FIG. 8 is a schematic diagram for explaining the operation of one embodiment.

FIG. 9 is a perspective view showing a main part of another embodiment of the present invention.

FIG. 10 is a perspective view showing a main part of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Combination weighing device 22 Housing 23 Vibration device 24 Transport trough 25 Pool hopper 33 Bottom plate 35 Weighing hopper 43 Bottom plate 50 Timing hopper 59 Bottom plate 65, 66 Conveyor 70 Collecting chutes 75, 76 Return control plates 80, 81 Rotating shafts 82, 83 Motor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-363630 (JP, A) JP-A-5-132151 (JP, A) JP-A 55-20312 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) G01G 19/387 B65G 15/00

Claims (1)

(57) [Claims] 1. A plurality of cylindrical weighers arranged linearly in a horizontal direction.
The objects to be weighed are supplied to the hoppers and weighed by each weighing hopper.
Of the weighing objects, the weighing target selected based on the weighing result
Discharge the mass from the weighing hopper,The discharged object to be weighed is
A conveyor belt disposed below the plurality of weighing hoppers;
Received on the tilting surface and conveyed to one end of the conveyor, one end of the conveyor
The object to be weighed out of the conveyor is placed under one end of the conveyor.
From the upper opening of the funnel-shaped collecting chute
Combination weighing device that receives and discharges from the lower discharge port
At  Edge on the conveyor side of the upper opening surface of the collecting chute
And the lower surface at one end of the conveyor,
The upper edge of one surface extending in the width direction of the conveyor is
One end of the conveyor, close to the belt on the lower surface on the end side
Move the weighing object attached to the belt on the lower surface of the
A return regulating body for regulating, and when the object to be weighed on the conveyor is carried out from one end side
Then, move the return restrictor inward of the collecting chute.Sa
And then return to the original stateDrive andEstablished
A combination weighing device, characterized in that: