JPH0332986Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a double-opening hopper in an automatic weighing device.

The object to be weighed is supplied to a plurality of weighing machines arranged in a circle, and the optimum combination of weighing machines to obtain a predetermined constant weight is selected from among each weighing value, and the weighing machine inside the selected weighing machines is In a combination type automatic weighing device that obtains the object to be weighed closest to the above-mentioned constant weight by discharging only the object to be weighed, each weighing machine is provided with a weighing hopper for storing the object to be weighed, and A pool hopper is provided above each weighing hopper for quickly supplying the object to be weighed for the next weighing when the object to be weighed is discharged from the hopper.

On the other hand, this type of automatic weighing device is usually used in combination with a packaging device, and is configured so that the objects to be weighed discharged from each weighing hopper are supplied to the packaging device via a collection chute. In this case, in order to improve processing capacity, the automatic weighing device may have a time lag between, for example, the operation of discharging the objects to be weighed from the weighing hopper to the collection chute and the operation of supplying and filling the objects to be weighed from the pool hopper to the weighing hopper. This method is designed to eliminate time loss by having the weighing items carried out at almost the same time without being fed, or by providing two gates in the weighing hopper and using the collection chute to collect the objects to be weighed which are discharged from one gate of the weighing hopper. It is a double mechanism consisting of an outer chute that accepts and an inner chute that receives the object to be weighed discharged from the other gate.The two gates are opened and closed alternately to discharge to the inner and outer collecting chute. By sorting, it is possible to shorten the interval between supplies of objects to be weighed from the weighing device to the packaging device.

However, when two gates are installed in a weighing hopper, each gate must be provided with an opening/closing link mechanism, but in the past, these opening/closing link mechanisms were installed independently on both outer surfaces of the hopper body. As a result, the width of the hopper or the space occupied by the hopper increased, and as a result, the pitch at which the hopper was installed became wider, and the entire automatic weighing device, which consisted of multiple weighing machines arranged in a circle, became larger. or the number of installed weighing machines is limited, resulting in problems such as impeding improvements in weighing accuracy.

The present invention was developed in view of the above-mentioned conventional circumstances. The link mechanism for opening and closing the two gates in the hopper is comprised of an operating lever that receives pressing force from a drive device, a drive link fixed to the lever, a driven link that swings integrally with the gate, and a drive link that swings integrally with the gate. It is composed of an intermediate link that connects the link and the driven link, and these link mechanisms are arranged on the same outer surface of the hopper main body, and these link mechanisms are arranged between both opening/closing link mechanisms in the gate closing direction. It is characterized by being equipped with a single biasing spring. This makes it possible to make the hopper more compact, making it possible to make the entire automatic weighing device more compact or to improve weighing accuracy by increasing the number of weighing machines.In addition, by sharing the gate return spring, the number of parts can be reduced, and the mechanism can be improved. It achieves simplicity, weight reduction, and cost reduction. Furthermore, by reducing the weight of the weighing hopper, vibrations transmitted from the hopper to the weighing machine can be effectively removed, thereby stabilizing the operation of the weighing machine, and improving weighing accuracy from this point of view as well. Plan.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 shows the overall structure of an automatic weighing device. Reference numeral 1 indicates a base, 2 a support stand constructed above the base 1, and a vibration device 3 in the center of the support stand 2. A table 4 for distributing objects to be measured is disposed through the table 4, and vibration devices 5 are installed around each table 4
...5, a plurality of supply troughs 6...6 are arranged radially. Further, the same number of pool hoppers 7 as the troughs are attached to the peripheral edge of the support base 2 so as to be located below the tip of each trough 6, and each hopper 7 is connected to an opening/closing link mechanism 8. Therefore, a gate 9 whose opening/closing is controlled is provided. 10...10 are a plurality of weighing machines arranged in a circle on the base 1 corresponding to each of the pool hoppers 7...7, 11...11 are weighing hoppers attached to each weighing machine 10, and each weighing hopper 11 is a double-opening type having two gates 12a and 12b, each of which is located below the corresponding pool hopper 7. 13...13 is a hopper 7, 11 or a weighing machine 10 suspended from the lower surface of the support stand 2.
14 is a motor that operates the devices, and each drive device 13 receives a command to discharge the object to be weighed and causes the pool hopper 7 and weighing hopper 11 located on the side to discharge the object to be weighed. It is equipped with a pusher 13a for opening the gate 9 of the pool hopper 7 and two pushers 13b and 13c for opening the gates 12a and 12b of the weighing hopper 11, respectively. Reference numeral 15 denotes a collecting chute which is located below each weighing hopper 11 and has a wide upper surface opening to receive the objects to be weighed discharged from the hopper, and each weighing hopper 11 is a double-opening type having two gates 12a and 12b. Corresponding to that, the collective shot 15 is as follows:
An outer chute 15 that receives objects to be weighed discharged from one gate 12a of each weighing hopper 11.
a, and an inner chute 15b that receives the object to be weighed discharged from the other gate 12b. In addition, each weighing hopper 11 is arranged approximately circularly above the circumference of the upper surface opening of the inner chute 15b in terms of its function.

Next, the structure of the weighing hopper 11 will be explained with reference to FIGS. 2 to 4. Reference numeral 16 denotes a hopper body in the shape of an inverted pyramid with an opening at the top and outlet ports 16a and 16b for objects to be weighed at the bottom; Brackets 17 and 18 are fixed to both sides of the hopper body, and end portions 17a and 18 protrude to one side of the hopper body 16.
Two locking shafts 19 and 20 are connected to the main body 16 between a.
They are constructed at different distances from the weighing machine 10 and in a stepped manner, and both shafts engage with an upwardly opening notch 21a and a downwardly opening notch 21b formed in a support member 21 fixed to the weighing machine 10, respectively. As a result, the weighing hopper 11 is held in the weighing machine 10. Further, a support shaft 22 of a link mechanism for opening and closing a gate, which will be described later, is installed between end portions 17b and 18b of the brackets 17 and 18 that protrude to the other side.

By the way, the two gates 12a and 12b mentioned above
is the object to be weighed discharge port 16a, 1 of the hopper main body 16.
6b is attached so as to be closed from both left and right sides as shown in FIG. The opening/closing link mechanisms 25, 26 of both gates 12a, 12b are arranged on the same outer surface of the main body 16, that is,
They are installed on one side of the bracket 18 in different vertical positions.

However, the opening/closing link mechanism 25 of one of the gates 12a rotates around the pivot 23 of the gate 12a.
a driven link 25a that swings integrally with the bracket 18; an intermediate link 25b attached approximately parallel to the outside of the bracket 18; a drive link 25c supported on the support shaft 22; and a driven link 25d.
The upper end of a and one end of the intermediate link 25b are connected to the pin 25e.
The other end of the intermediate link 25b and the end of the drive link 25c are connected by a pin 25f, and the drive link 25c and the operating lever 25d are fixedly connected to the support shaft 22.
The operating lever 25 can be pivoted around the
A pusher receiving roller 25g is mounted on the end of d. On the other hand, the opening/closing link mechanism 26 for the gate 12b moves the gate 12 around the pivot shaft 24.
a driven link 26a that swings integrally with b; an intermediate link 26b positioned on an oblique imaginary line connecting the lower end of the driven link 26a and the support shaft 22; and a drive link supported by the support shaft 22. 2
6c and an operating lever 26d also supported on the support shaft 22, the lower end of the driven link 26a and one end of the intermediate link 26b are connected by a pin 26e, and the other end of the intermediate link 26b and the driving link 26c. The end portions of the drive link 26c and the operating lever 26d are connected by a pin 26f, and the drive link 26c and the operating lever 26d are fixed via a connecting member 26g.
It can swing around the support shaft 22, and furthermore, a pusher receiving roller 26h is provided at the end of the operating lever 26d.
is mounted on the shaft. Furthermore, the opening/closing link mechanism 2
A gate return tension spring 27 is interposed between the drive links 25c and 26c via spring receiving members 27a and 27a, and the spring force of the spring 27 causes the respective gates 12a and 26 to be moved. 12b is always biased in a direction to close the object discharge ports 16a and 16b.

In addition, the stopper 28 in FIGS. 2 and 3 is connected to the intermediate link 25 when the gate 12a is in the closed position.
b is brought into contact by the spring force of the spring 27, and the stopper 29 is such that when the gate 12b is in the closed position, the protruding piece 26c' provided on the drive link 26c comes into contact with the stopper 29 by the spring force of the spring 27. Both switchers 28 and 29 are provided on the bracket 18 and regulate the positions of the opening and closing link mechanisms 25 and 26 when the gate is closed. As shown in FIG. 4, the operating lever 25d and the connecting member 26 are fixed to the drive links 25c, 26c of the opening/closing link mechanisms 25, 26, respectively.
Pusher receiving rollers 25g and 26 g are shaped like a U and are supported at two points on the support shaft 22, and are mounted on the ends of the operating levers 25d and 26d.
h are arranged on the sides of the hopper main body 16 so as to overlap vertically in a straight line.

Next, to explain the operation of the above embodiment, the objects to be weighed distributed and supplied from the distribution table 4 to each weighing hopper 11...11 via each trough 6...6 and pool hopper 7...7 are distributed to each weighing machine 10... 10
The optimal combination for obtaining the combined total value closest to a predetermined constant weight is selected from among the measured values, and the selected object to be weighed is weighed at one of the weighing hoppers 11. When one gate 12a or 12b is opened by protruding the pusher 13b or 13c of the corresponding drive device 13, the discharge is discharged into the lower collecting chute 15 (outer chute 15a or inner chute 15b), The materials are collected by the chute and then supplied to a packaging device (not shown) provided below. In addition, a pusher 13a of the drive device 13 protrudes from the weighing hopper 11 from which the object to be weighed has been discharged, and a pool hopper 7 located above the weighing hopper 11
By opening the gate 9 via the opening/closing link mechanism 8, the object to be weighed is immediately supplied from the hopper 7 and is ready for the next weighing.

However, during such weighing and discharging operations of objects to be weighed, in the weighing hopper 11, the spring force of the gate return spring 27 is applied to the drive links 25c, 26.
As shown in FIG. 2, each gate 1
2a, 12b are normally used for measuring object discharge ports 16a, 1
6b is in a closed state. At this time, in the case of one opening/closing link mechanism 25, the intermediate link 25
b and the drive link 25c are connected to the support shaft 22 and the pin 25.
Similarly, in the other opening/closing link mechanism 26, the intermediate link 2
6b and the drive link 26c are connected to the support shaft 22 and the pin 2.
6e and both are at the dead center position, these gates 12a and 12b open due to the gravity of the object to be weighed stored in the weighing hopper 11 applied to the gates 12a and 12b. Never.

When the pusher 13b of the drive device 13 protrudes, the pusher receiving roller 25g of the opening/closing link mechanism 25 is pressed against the pusher 13b, thereby supporting the operating lever 25d and the drive link 25c as shown in FIG. The drive link 25c and the intermediate link 25b are bent in the counterclockwise direction (direction a in the figure) about the shaft 22, and the position of the pin 25f is raised, and accordingly, the intermediate link 25b is At the same time as being pulled to the left in the drawing, the driven link 25a is also swung to the left (direction b), thereby the gate 12a is swung outward about the pivot 23, and the object to be weighed discharge port 16a is opened. It comes to be done. Then, when the pusher 13b retreats after the discharge of the object to be weighed is completed,
Due to the spring force of the gate return spring 27, the gate 12a instantly closes the object discharge port 16a.
Next, another pusher 13c in the drive device 13
protrudes and presses the pusher receiving roller 26h of the opening/closing link mechanism 26, the operating lever 26d and the drive link 26c swing clockwise (direction c) about the support shaft 22 as shown in FIG. 26c and the intermediate link 26b are bent in the middle, and the position of the pin 26f moves to the left in the drawing.
Along with this, the intermediate link 26b is pulled in the same direction, and the driven link 26a is swung to the left (direction d), thereby the gate 12b is swung outward about the pivot 24, and the object to be weighed is Discharge port 16b
will be released. When the pusher 13c retreats after the discharge of the object to be weighed is completed, the gate 12b is instantly moved back by the spring force of the gate return spring 27.
closes the object to be weighed outlet 16b. In this way, the gates 12a and 12b are alternately opened and closed,
The objects to be weighed are supplied to the packaging device at short time intervals via the outer chute 15a and the inner chute 15b of the collection chute 15.

In the above embodiments, the present invention is applied to the weighing hopper 11, but in the case where the pool hopper 7 is equipped with two gates, which are opened and closed alternately, the structure of the present invention can be applied to the pool hopper as is. It can also be applied to

As described above, according to the present invention, in a configuration in which a hopper in an automatic weighing device is equipped with a pair of left and right gates, the link mechanisms for opening and closing both gates are installed on the same outer surface of the hopper main body, so that the width of the hopper is is smaller than the conventional one in which opening/closing link mechanisms are separately provided on both outer surfaces of the hopper body. Therefore, when a plurality of hoppers are arranged in a circular manner, by narrowing the spacing by the width reduction, the entire automatic weighing device can be made smaller, or the number of hoppers or weighing machines installed can be increased. Therefore, by increasing the number of combinations at the time of measurement, it is possible to improve the measurement accuracy.

In addition, the gate return spring as a component of the link mechanism for both opening and closing is shared, and the number of parts used is reduced accordingly, making it possible to simplify the mechanism, reduce weight, and reduce costs. .

In particular, when the hopper is a weighing hopper as in the above embodiment, the vibrations generated when loading the object to be weighed become high-frequency vibrations that can be technically easily removed by reducing the weight of the hopper. By preventing or reducing transmission of vibration to the weighing machine, stabilization time is shortened, and measurement accuracy can be improved.

[Brief explanation of the drawing]

Fig. 1 is an overall vertical sectional view of an automatic weighing device to which the present invention is applied, Fig. 2 is a front view of a hopper showing an embodiment of the present invention, Fig. 3 is a plan view of the same, and Fig. 4 is a partially cutaway view of the same. The side view, FIGS. 5 and 6 are explanatory views of the operation of the opening/closing link mechanism. 10...Weighing machine, 11...Weighing hopper, 12
a, 12b...gate, 13...driver, 16
...Hopper body, 16a, 16b...Measurement object discharge port, 25, 26...Gate opening/closing mechanism, 25
a, 26a...driven link, 25b, 26b...
Intermediate link, 25c, 26c... Drive link, 2
5d, 26d...operation lever, 27...spring.

Claims (1)

[Scope of utility model registration request] In an automatic weighing device in which a plurality of weighing machines are arranged in a circular arrangement, hoppers are also arranged in a circular arrangement corresponding to each of the above-mentioned weighing machines, and the hoppers are provided at the discharge ports of the objects to be weighed at the bottom of the main body, independently of each other and in opposite directions. A pair of gates that open and close are provided, and link mechanisms for opening and closing both gates are installed on the same outer surface of the hopper body, and each of these link mechanisms receives pressing force from the drive device. The control lever has an operating lever that receives the operation lever, a drive link fixed to the lever, a driven link that swings integrally with the gate, and an intermediate link that connects the drive link and the driven link, and The gate is configured such that the corresponding gate is opened by the pressing force, and a single spring is installed across both link mechanisms to bias the link mechanisms in the gate closing direction. A double-door hopper in an automatic weighing device.