JP4047449B2 - Distributed supply device for combination weigher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dispersion supply apparatus for appropriately supplying articles to a plurality of weighing tanks provided in a combination weigher.
[0002]
[Prior art]
Various combinations of the weighing values of articles weighed in multiple weighing tanks are selected, and the combination weight value is equal to or close to the target weight value, and the articles in the selected weighing tanks are respectively discharged and combined. Bags are made by a packaging machine provided in the subsequent stage. At present, a combination weigher is widely known as a weighing device for performing such a weighing method. This type of weighing device obtains the target weight by combination, so there is accuracy in combination (called combination accuracy) in addition to the weighing accuracy called a general scale, and each article has it. The supply accuracy varies depending on the variation in weight (hereinafter referred to as single weight), and the combination accuracy is affected. The supply accuracy is also affected by the amount of supply supplied at one time when supplying articles to multiple weighing tanks. It is known that For example, Japanese Patent Application Laid-Open No. 4-371414 discloses one technique thereof.
[0003]
However, in this technique, there is a vibration feeder called a circular umbrella-shaped dispersion feeder, and a cylindrical cylinder is provided substantially concentrically within a range on the receiving plate, and an article supplied from above into the cylinder is distributed to the dispersion feeder. When the level of the article in the cylinder is constantly monitored by the photoelectric sensors provided above and below the cylinder and the lower limit is reached, the article is supplied from the upper supply conveyor and reaches the upper limit. Supply is stopped. The cylindrical body is supported from the outside excluding the dispersion feeder, and the support portion is moved up and down to adjust the clearance between the receiving plate on the dispersion feeder and the bottom end of the cylinder to adjust the article on the dispersion feeder. The layer thickness is adjusted. Then, the articles are supplied to a plurality of linear feeder conveyance bases (generally referred to as conveyance trays) provided radially on the outer periphery of the dispersion feeder, and provided on the outside of the plurality of linear feeders corresponding to the respective linear feeders. It is a structure supplied to the measuring tank. Such a structure can be said to be a general structure in the current combination weigher.
[0004]
However, as described above, since the layer thickness is adjusted in the umbrella-shaped portion of the dispersion feeder, there is an advantage that the layer thickness can be changed all at once and the supply amount can be greatly increased or decreased. Supply is offset in any direction that is not perfectly uniform and does not have the same layer thickness in all directions on the dispersion feeder. This is because the layer thickness of the articles conveyed by the supply conveyor is not constant and there is no guarantee that the articles will be continuously supplied. That is, when the layer thickness of the article on the supply conveyor is large, the article is supplied more in the traveling direction side of the supply conveyor, and when it is less, it tends to be supplied to the front. Therefore, the layer thickness distribution on the dispersion feeder is shifted and the vibration of the dispersion feeder is uniform over the entire circumference, so it is naturally supplied to the plurality of linearly-feeding feeders as they are. The layer thickness on the straight feeder also varies. For this purpose, it is necessary to secure a certain supply amount by adjusting the conveyance capacity individually for each linear feeder or by adjusting the operation time of the linear feeder for supplying articles to the weighing tank. Feeder control is necessary. However, this constantly changes the operation program of the combination weigher, and there is a problem that the burden on the driver's work at the site increases.
[0005]
On the other hand, even if the supply state from the supply conveyor is normal without any deviation, if each of the linear feeders varies in amplitude, etc. It is required to make the amount of articles supplied to each weighing tank uniform by varying the amount of articles supplied to the linear feeder in consideration of capacity. In addition, even if the conveying capacity of each linear feeder is uniform, there is little variation in the unit weight, and if it is supplied uniformly to each weighing tank, it is necessary to intentionally vary the amount supplied to each linear feeder. Occurs. However, in the conventional technique, since the layer thickness is regulated within the upper surface of the dispersion feeder, it has flowed uniformly and it has been difficult to satisfy these requirements. In addition, for articles that are easily entangled and articles that are sticky, the supply amount is different for each measuring tank, and thus a device that can be adjusted individually is required.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems. When an article is supplied to a dispersion feeder in a combination weigher, a desired amount is reliably supplied to each weighing hopper even if the supply state is shifted or fluctuated. That the desired amount of articles can be reliably supplied to each weighing hopper by adjusting the layer thickness of each article for each linear feeder. It is an object of the present invention to provide a combination weigher with high combination accuracy by stabilizing the layer thickness and always supplying it with uniform distribution.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, a first invention is a dispersion feeder that conveys an article to the periphery by spiral reciprocating vibration, a conical tray attached to the top of the dispersion feeder, and an outer periphery of the conical tray. Are attached to a plurality of rectilinear feeders that are arranged at least at an equal interval and are radially disposed, and an article transporting section that includes a transport tray that transports articles by vibration of the rectilinear feeder, and A layer thickness adjusting device provided on the transport tray of the plurality of linearly moving feeders, the layer thickness adjusting device being arranged along a ring-shaped frame body and an outer periphery of the ring-shaped frame body; A distributed supply for a combination weigher characterized by comprising a layer thickness regulating plate made of an elastic body to be attached and a tightening band for fixing the layer thickness regulating plate to the ring-shaped frame body It is the location.
[0008]
The second invention has a dispersion feeder that conveys an article to the periphery by a reciprocating spiral, a conical tray attached to the top of the dispersion feeder, and an outer periphery of the conical tray that overlaps with each other at least at equal intervals in a radial manner. An article transport unit that is attached to a plurality of rectilinear feeders and is configured to transport an article by vibration of the rectilinear feeder, and the transport tray of the plurality of rectilinear feeders in the article transport unit The layer thickness adjusting device provided to be located at a ring-shaped frame, and the ring-shaped frame includes a plurality of the plurality of the article conveying units constituting the article transporting unit The linear feeder has a position assigned by the number corresponding to the number of the transport trays on the circumference, and the position assigned to the ring-shaped frame is stable on the outer peripheral curved surface of the ring-shaped frame. A plurality of layer thickness adjusters, each of which includes a layer thickness regulating plate mounting plate bent at both ends, a layer thickness regulating plate using an elastic body, and the above layer thickness regulating plate holding plate, are movable in the vertical direction. It is characterized by being attached in a detachable structure. It is also a feature of the present invention that the means for attaching and fastening the layer thickness adjuster to each of the assigned positions of the ring-shaped frame is a single bolt and nut, respectively.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A dispersion supply device for a combination weigher is shown in FIGS. (A) is a schematic sectional view of a distributed supply device, (B) is a side view of a layer thickness adjusting device, and (C) is a plan view of the distributed supply device. The schematic configuration of the dispersion supply apparatus is as follows: a vibrator 1 that reciprocates in a spiral, a conical tray 2 fixed to the top of the vibrator 1, a plurality of linear feeders 3 arranged at least at equal intervals around the tray, and a fixed to the same. A conical shape on at least the dispersion feeder so as to be positioned on the transporting tray and the weighing unit 5 provided with a weighing tank for receiving the supply of articles from the transporting tray at positions corresponding to the transported tray 4 and the transporting tray. And a layer thickness adjusting device arranged concentrically with the center of the tray. FIG. 3 shows a state where articles are supplied to the distributed supply apparatus. Now, when the article 8 is supplied from the supply conveyor 9 onto the upper tray 2 of the dispersion feeder 1, the article 8 is dispersed on the tray 2 and conveyed by the rectilinear feeder 3 located around the tray by dropping from the supply conveyor 9. Although it reaches the tray 4, it is further uniformly dispersed by the vibration of the dispersion feeder.
[0010]
As described above, in the combination weigher, each weighing tank is supplied with an amount of approximately a fraction of the target weight at a time and weighed. Various combinations of the measured values are used to obtain a combination that is equal to or close to the target weight by computer calculation. From this, the layer thickness and transport capacity of articles on the transport tray of the linear feeder and the layer thickness and dispersion supply capacity on the receiving tray of the dispersion feeder are determined by determining the target weight, and the layer thickness and the amplitude of the feeder, respectively. Will also be decided. Therefore, as shown in FIG. 3, the layer thickness adjustment device 6 regulates the layer thickness on the transport tray 4, but it is desirable that the article flow on the transport tray be transported uniformly without interruption. Therefore, it is necessary to secure a layer thickness slightly larger than the layer thickness of the transport tray inside the layer thickness adjusting device. That is, the amount of articles on the dispersion feeder is always required to be regulated by the layer thickness adjusting device, and the layer thickness on the dispersion feeder is secured by the level sensor 10.
[0011]
FIG. 4 shows a first embodiment of the aforementioned layer thickness adjusting apparatus, in which 6-1 is a ring-shaped frame. 6-2 is a layer-thickness regulating plate, for example, a belt-like sheet using an elastic body such as urethane rubber or synthetic rubber. It is a warm sheet with slits (cuts) from one side, and the depth of the slit is appropriately determined according to the article. It is determined. Further, this slit is deformed at the peak portion 4-1 of the transport tray and divided into any of the adjacent transport trays 4. In addition, the portion other than the peak portion 4-1 of the transport tray is left as it is without being deformed, and serves to regulate the layer thickness of the article. At this time, the layer thickness of the article can be determined by increasing or decreasing the size of the gap between the lowermost end of the layer thickness regulating plate 6-2 and the trough 4-2 of the transport tray 4. Reference numeral 6-3 denotes a fastening band for winding and fixing the layer thickness regulating plate 6-2 around the ring-shaped frame 6-1. Further, when adjusting the layer thickness over the entire transport tray 4, it is possible to change the fixing position of the ring-shaped frame attachment 7 up and down.
[0012]
FIG. 5 shows a second embodiment of the aforementioned layer thickness adjusting apparatus, and 6-4 is a ring-shaped frame. 6-5 is a layer thickness regulating plate using an elastic sheet such as urethane rubber or synthetic rubber. 6-6 is a presser plate for the layer thickness regulating plate, and 6-7 is a layer thickness regulating plate mounting plate with both ends bent. 6-8 is a mounting bolt, and 6-9 is a fixing nut. A plurality of sets are prepared by configuring the layer thickness adjusting tool 6-10 as a set of the layer thickness regulating plate 6-5, the presser plate 6-6, and the layer thickness regulating plate mounting plate 6-7. The order of attaching these layer thickness adjusters 6-10 to the ring-shaped frame is illustrated in FIG. In the same figure, (A) is the figure which removed one of several layer thickness adjustment tools from the ring-shaped frame, (B) is the figure attached and fixed to the ring-shaped frame. FIG. 5 shows the entire structure. When the layer thickness adjuster 6-10 is attached to the circumference of the ring-shaped frame 6-4, the circumference of the ring-shaped frame 6-4 is shown. At least a position assigned by the number corresponding to the transport tray 4 of the plurality of linear feeders 3 is provided on the circumference, and the layer thickness adjuster is attached to the position. The layer thickness regulating plate 6-5 coincides with the trough 4-2 of the corresponding transport tray 4 so as to fit in the center of each transport tray. The layer thickness adjuster 6-10 including the layer thickness regulating plate is fixed to the ring-shaped frame body with the mounting bolts 6-8 and the fixing nuts 6-9. The feature of the layer thickness adjusting device according to the present embodiment is that the layer thickness can be adjusted for each transport tray, and each layer thickness adjusting tool can be moved at least up and down with a mounting hole near the center as a long hole. It is that. Furthermore, since the layer thickness regulating plate mounting plate 6-7 is bent at both ends, it is easy to follow the outer periphery of the ring-shaped frame body and does not rotate independently even if it is mounted by one bolt 6-8. When the layer thickness is adjusted uniformly over the entire transport tray, it is possible to change the fixing position of the ring-shaped frame attachment 7 up and down.
[0013]
【The invention's effect】
As described above, the dispersion supply apparatus according to the first aspect of the present invention adjusts the layer thickness so as to be positioned on the transport trays on the plurality of linear feeders arranged radially on the outer periphery of the conical tray attached to the top of the dispersion feeder. Since the equipment is provided, even if there is some deviation or fluctuation in the supply state of the articles supplied from the upper part of the receiving tray of the dispersion feeder, it is smoothed on the linear feeder and a uniform layer thickness is obtained in each weighing tank. The quantity of goods can always be secured. Further, in the distributed supply apparatus according to the second invention, since the layer thickness can be adjusted for each transport tray in addition to the above, even when there is variation in the amplitude or the like of the linear feeder and the transport capability is different, Therefore, a desired amount of articles can always be secured in each weighing tank, and as a result, a combination weigher with high combination accuracy can be provided. Further, when the layer thickness adjuster is attached to the ring-shaped frame, since the means for fastening the layer thickness adjuster is a single bolt and nut, the number of parts and the number of processing steps can be reduced, and it can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is an overall view showing a first embodiment of the present invention.
FIG. 2 is an overall view showing a second embodiment of the present invention.
FIG. 3 is a view showing a state where an article is supplied in the present invention.
FIG. 4 is a diagram showing a first embodiment of the present invention.
FIG. 5 is a diagram showing a second embodiment of the present invention.
FIG. 6 is a detailed view of a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Dispersing feeder 2 Cone-shaped saucer 3 Straight advance feeder 4 Carrying tray 5 Weighing part 6 Layer thickness adjusting device 7 Frame attachment tool 8 Article 9 Supply conveyor 10 Level sensor

Claims (3)

A dispersion feeder that conveys an article to the periphery by reciprocating vibration of a spiral, a conical tray attached to the top of the dispersion feeder, and a plurality of rectilinear feeders that overlap with the outer periphery of the tray and are radially arranged at least at equal intervals And an article conveying unit configured to convey an article by vibration of the linear feeder, and provided on the conveying tray of the plurality of linear feeders in the article conveying unit. The layer thickness adjusting device is attached along the outer periphery of the ring-shaped frame and the ring-shaped frame, and regulates the layer thickness of the article on the transport tray. A dispersion supply apparatus for a combination weigher, comprising: a layer thickness regulating plate made of an elastic body; and a fastening band for fixing the layer thickness regulating plate to the ring-shaped frame. A dispersion feeder that conveys an article to the periphery by reciprocating vibration of a spiral, a conical tray attached to the top of the dispersion feeder, and a plurality of rectilinear feeders that overlap with the outer periphery of the tray and are radially arranged at least at equal intervals And an article conveying unit configured to convey an article by vibration of the linear feeder, and to be positioned on the conveying trays of the plurality of linear feeders among the article conveying units. A layer thickness adjusting device provided, wherein the layer thickness adjusting device corresponds to the transport tray of the plurality of rectilinear feeders constituting the article transport section, and the ring-shaped frame body The positions assigned to the circumference are rounded, and the ends assigned to the ring-shaped frame pairs are folded at both ends so as to stably follow the outer peripheral curved surface of the ring-shaped frame. A plurality of layer thickness adjusters, consisting of a bent layer thickness regulating plate mounting plate, a layer thickness regulating plate using an elastic body, and a pressing plate for the layer thickness regulating plate, are movable at least in the vertical direction and are detachable. A distributed supply device for a combination weigher equipped with a layer thickness adjusting device. 3. The combination weigher according to claim 2, wherein the means for detachably attaching and fastening the layer thickness adjuster to each of the allocated positions of the ring-shaped frame is a single bolt and nut, respectively. Decentralized supply device.

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