JP2001146319A - Hopper device and combined measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce or prevent noise when a gate collides with a hopper main body in a hopper device, a measuring device, and a combined measuring device. SOLUTION: In this hopper device P, the gate 8 is rotated through a rotation mechanism 1 to open/close a discharge port of a hopper main body 6. In the hoper device P comprising a toggle link mechanism T, and a follower link 13 normally or inversely rotated through the toggle link mechanism T to rotate the gate 8 in an opening direction or a closing direction, an adjusting mechanism 30 is provided for conducting position adjustment of a rotation end of the follower link 13 to correspond to a closed condition of the gate 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hopper device and a combination weighing device.

[0002]

2. Description of the Related Art In a hopper device in which a gate swings with respect to a hopper body, a collision sound is generally generated when the gate is closed. Such a collision sound causes noise. In particular, since the combination weighing device has a large number of hopper devices and has a large number of times of opening and closing, it is important to suppress and prevent the noise.

In view of the above, there has been conventionally known an apparatus which controls a stop position and a rotation speed of an output shaft of a drive motor for opening and closing a gate to reduce a gate collision sound (for example, Japanese Patent Application Laid-Open No. HEI-5-1993). 162787).

[0004]

However, there is "play" in a hopper device employing a toggle link mechanism for opening and closing the gate. Because of this "play", even when controlling the motor, when the gate closes,
Since the gate collides with the hopper body and the "play" is present, the vibration at the time of the collision is hardly attenuated, so that the noise at the time of the collision cannot be further reduced.

Therefore, an object of the present invention is to reduce or prevent noise when a gate collides with a hopper body in a hopper device, a weighing device, and a combination weighing device.

[0006]

In order to achieve the above object, the present invention relates to a hopper device for opening and closing a discharge port of a hopper body by rotating a gate through a rotating mechanism. Is a hopper device having a toggle link mechanism and a driven link that rotates in the forward and reverse directions through the toggle link mechanism to rotate the gate in the opening direction and the closing direction. An adjusting mechanism is provided for adjusting the position of the rotating end of the corresponding driven link.

In the present invention, the position of the rotating end of the driven link is adjusted by operating the adjusting mechanism while assembling the gate to the hopper body via the toggle link mechanism and the driven link, or after assembling. Thereby, when the gate is closed, the setting is made so that the gate does not collide with the hopper main body or is less likely to collide.
Therefore, noise can be reduced or prevented.

In the present specification, a “toggle link mechanism”
Is a so-called "toggle joint", which is a booster mechanism for preventing the gate in the closed state from opening due to the weight of the gate and the contents. “Rotation end position adjustment” can be performed by adjusting the position of the fixed center of the toggle link mechanism.

Here, the “permanent center” means that the instantaneous center between two objects (links) is the two objects (links).
Means the instantaneous center when is a fixed point with respect to (University course “Mechanism”, Ohmsha). Also, "fixed center"
Of the permanent center, the position of the center is fixed (immovable) with respect to a fixed portion (hopper body) of the machine during movement.
(Same as above). The moving object is
At a certain moment, it can be considered that the object is rotating around a certain point, and such a point is called an “instantaneous center” (ibid.).

The present invention can also be applied to a combination weighing device that collects a plurality of objects to be weighed by a plurality of weighing hopper devices and sets a target weight or a target number.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described using a combination weighing device as an example. First, the general mechanism and operation of the device will be briefly described.

As shown in FIG. 1, the conveyor 300
Causes the contents M to be weighed to drop to the center of the dispersion feeder 401 of the combination weighing device 400. In addition, several or many contents M are collected and bagged later to be a product.

The dispersion feeder 401 and the supply troughs 3i vibrate by driving a vibrating device, respectively, so that the contents M on the dispersion feeder 401 can be transferred to a number of pool hoppers provided downstream of the supply troughs 3i. It is supplied to the main body 4i. Each pool hopper main body 4i is provided with a gate 5i, and temporarily stores and stores the contents M supplied and received from each of the supply troughs 3i. A measuring hopper main body 6i is provided downstream of each pool hopper main body 4i. Each of the weighing hopper bodies 6i receives the contents M from the pool hopper body 4i. The weight of the inserted contents M is detected by the weight detector 7i. A gate 8i is provided below the weighing hopper body 6i. Below the gate 8i, a large collecting discharge chute 9 is provided. By combining the weights of the contents M detected by the respective weight detectors 7i, the contents M are collectively set as a target value or a target value. And the content M is dropped downstream.

The weighing hopper body 6 and the gate 8 shown in FIG. 2 and the rotating mechanism 1 constitute a hopper device P. Each hopper device P includes, for example, an opening / closing drive using a solenoid as a drive source. The opening / closing drive device rotates the output shaft 22 by a predetermined angle by the driving force of the solenoid.
The drive arm (drive link) 23 of FIG.
Is reciprocated in a predetermined angle range as shown in FIGS. 3 (a) and 3 (b). The drive arm 23 is connected to the output shaft 22 via a coupling 23a rotatably provided on the bracket 60 in FIG. 2, for example.
The hopper device P may have a structure that can be detached and attached by a fork method instead of the coupling 23a.

The rotating mechanism 1 is attached to the weighing hopper body 6 via a bracket 60, and the gate 8 is attached via the rotating mechanism 1 in FIG. The rotation mechanism 1 rotates the gate 8 to open and close the discharge port 61 of the weighing hopper body 6. It is preferable to set an extremely narrow (about 0.1 mm) gap Ss between the gate 8 and the lower end of the weighing hopper body 6. Note that, in order to make the structure of the rotating mechanism 1 easy to understand, the bracket 60 (FIG. 2) is not shown in FIG.

The rotating mechanism 1 includes a connecting link 10, a toggle link mechanism T, and a driven link 13.
The drive arm 23 is engaged with the input shaft 10a at the lower end of the connecting link portion 10. Therefore, output shaft 2
2 rotates by an angle necessary to open the gate 8, the drive arm 23 performs a predetermined rotation in accordance with the rotation, and the connecting link portion 10 is connected via the input shaft 10a to the connecting link portion 10 in FIG.
Exercise as shown in (b). The input shaft 10a is slidable with respect to a long hole (not shown) provided in the drive arm 23.

The toggle link mechanism T includes a first link 11 that rotates about a first fixed center (permanent center) F1;
A second link 12 rotatably connected to a first movement center (permanent center) C1 at a left end (an end opposite to the first fixed center F1) of the first link 11; In the embodiment, the first movement center C <b> 1 is bent in an inverted “H” shape. The first movement center C1 of the toggle link mechanism T is a point at which an operating force is input to the rotation mechanism 1. In the present embodiment, the connecting link portion 10 is integrally formed with the second link 12 in the "K".
Is formed. The driven link 13 is rotatably attached to a second movement center (permanent center) C2 at the left end of the second link 12. The driven link 13
Is rotatably attached to the weighing hopper main body 6 about the second fixed center F2 at the center thereof. Therefore, the first link 11, the second link 12, the driven link 13 and the weighing hopper main body 6 can be considered as a fixed link between the point F1 and the point F2. Are chained together).

At the lower end of the driven link 13 (the end opposite to the second movement center C2), a plate-like gate 8 is mounted. Accordingly, when the connecting link portion 10 rotates leftward (forward direction) by a predetermined angle from the closed state of FIG. 3A, the toggle link mechanism T is inverted to “he” as shown in FIG. 3B.
, And the gate 8 rotates in the opening direction O via the driven link 13 to open the discharge port 61. On the other hand, FIG.
From the open state of (b), the connecting link portion 10 moves to the right (reverse direction)
Is rotated by a predetermined angle, as shown in FIG.
The upper end of the link 12 abuts against the stopper 62, the first link 11 and the second link 12 are substantially aligned, and the gate 8 rotates in the closing direction S via the driven link 13, and the discharge port 61 is opened. close. When the gate 8 is closed in a state where the toggle link mechanism T is substantially aligned, the gate 8 is closed.
Even if an external force (shock) due to the loading of the object to be weighed M acts after the closing of the gate, the gate is not opened by the external force. In this specification, the term “substantially straight” includes a state close to a straight line in addition to being completely straight.

Further, in the present embodiment, when the drive arm 23 and the connecting link portion (input mechanism) 10 are substantially aligned, the two links of the toggle link mechanism T are aligned substantially in a straight line, and 8 is closed. Therefore, it is ensured that the gate 8 is kept in the closed state.

In this embodiment, the second link 12 and the connecting link 10 are formed as an integral L-shaped link, and there is no play between the connecting link 10 and the second link 12. When the drive arm 23 rotates from the closed state of the gate 8, the gate 8 can be quickly opened in the opening direction.

Next, the adjusting mechanism 30 which is a main part of the present invention will be described.
Will be described. As shown in FIG. 3, the adjustment mechanism 30 is provided at the first fixed center F1. As shown in FIG. 4, the adjusting mechanism 30 includes a bearing 34, an eccentric shaft (shaft member) 35.
And a plurality of set screws 36. The bearing 3
4 is a weighing hopper body 6 via a bracket 60 (FIG. 2).
The bearing 34 is formed with a bearing hole 34a. The eccentric shaft 35 has a fixed shaft portion 35a and an eccentric shaft portion 35b fitted into the bearing hole 34a.
The first link 11 of FIG.
It is rotatably fitted at the fixed center F1 (attached in a pair).

The fixed shaft portion 35a shown in FIG. 4 is fixed to the bearing 34 by tightening a set screw 36.
By loosening 6, it becomes rotatable in the bearing hole 34a. The eccentric shaft 35b is provided eccentric with respect to the fixed shaft 35a by a small dimension Δ (for example, about 0.5 mm). That is, the first fixed center F1 is eccentric by the minute dimension Δ with respect to the rotation center Cc of the eccentric shaft 35. Therefore, by setting the rotational position of the eccentric shaft 35, the position of the first fixed center F1 can be adjusted.

As described above, by adjusting the position of the first fixed center F1, the three points C2, C1, and F1 of the toggle link mechanism T are aligned when the gate 8 in FIG. 3 is closed. And play around a pin or the like containing these three points C2, C1 and F1.
(Play between links) disappears. Therefore, the accuracy of the closing position of the gate 8 can be improved, and even if the closed gate 8 collides with the weighing hopper main body 6, the gate 8 comes into close contact with the weighing hopper main body 6 and the gate 8 at the time of the collision
Vibration is attenuated quickly, and the vibration noise can be attenuated. By the way, as the position of the first fixed center F1 is adjusted, the position of the first moving center C1 when the three points C2, C1, and F1 are aligned on a straight line is also slightly displaced. Need to change. Stopper 62
2 can be adjusted manually by using a tool to adjust the abutment of the link of the stopper 62 in FIG. 2 or by providing a screw hole in the stopper 62 in advance and adjusting the adjustment bolt in the screw hole. There is also a method such as inserting the tip and adjusting with the tip. In the present invention, the stopper 62 does not always need to be provided.

Further, in the present embodiment, when the drive arm 23 and the connecting link 10 shown in FIG.
The two links 11 and 12 of the toggle link mechanism T are aligned on a straight line, and the gate 8 is closed. for that reason,
Since the second link 12 is less likely to overrun than the position where it should be stopped, the closing position of the gate 8 can be adjusted with high accuracy. In addition, the speed immediately before the closing of the gate 8 can be significantly reduced, so that the generated impulsive sound is reduced.

Further, in the case of the present embodiment, the first projecting piece 81 at the lower end of the gate 8 first contacts the second projecting piece 63 at the lower end of the weighing hopper body 6, and then the two projecting pieces 63. The protruding pieces 63 and 81 are elastically deformed. Then, Gate 8
The whole is brought into contact with the weighing hopper body 6. Therefore, the impact when the first protruding piece portion 81 collides can be reduced, and the noise reduction effect can be enhanced. The degree of bending of the first and second projecting pieces 81 and 63 may be appropriately adjusted during or after assembly.

In this embodiment, the eccentric shaft 35 shown in FIG.
Is rotated to adjust the position of the first fixed center F1. That is, since the eccentric shaft portion 35b is fitted in the bearing hole 34a without any gap (nice), even if the gate 8 is repeatedly opened and closed, There is no possibility that the position of the first fixed center F1 is displaced with time due to an impact at the time of opening and closing.

Although the hopper device P of the weighing device has been described in the above embodiment, a similar link mechanism is adopted for the pool hopper to reduce noise.

In the above embodiments, the position of the first fixed center F1 is adjusted to adjust the position of the rotating end of the driven link 13 corresponding to the closed state (the position of FIG. 3A).
Is adjusted, but in the present invention, the position of the second fixed center F2 may be adjusted. That is, as shown in FIG. 5, when the adjustment mechanism 30 is provided at the second fixed center F2 and the position of the point F2 is changed, the position of the rotating end of the driven link 13 changes, and the gate 8
Can be set and changed, and the "play" between the links 11, 12, and 13 can be reduced. However, providing an adjustment mechanism at the first fixed center F1 is superior in durability against repeated impacts, and
Good workability and adjustment workability.

Next, another example of the adjusting mechanism will be described with reference to FIG. In the present embodiment, the adjustment mechanism 30A includes an arm-shaped adjustment bracket 31, a fixing bolt 32, and a female screw member 33. The first fixed center F1 is provided at an upper end of the adjustment bracket 31. The female screw member 33 is fixed to the weighing hopper main body 6 via a bracket 60. The fixing bolt 32 sandwiches the adjustment bracket 31 between the fixing bolt 32 and the female screw member 33.

Therefore, the adjustment bracket 31 is
The rotation position can be adjusted, whereby the position of the first fixed center F1 can be adjusted in the direction of arrow A. By performing the position adjustment of the first fixed center F1, the position of the rotation end of the second movement center C2 is changed in the direction of arrow A, and the rotation of the driven link 13 corresponding to the closed state of the gate 8 is performed. The position of the edge is changed. Other configurations of the present embodiment are the same as those of the first embodiment, and the same or corresponding portions are denoted by the same reference characters and description thereof will be omitted.

[0031]

As described above, according to the present invention,
Since the position of the rotation end of the driven link corresponding to the closed state of the gate can be adjusted, the size of the gap between the gate in the closed state and the hopper body can be finely adjusted. Therefore, it is possible to prevent the gate from colliding with the discharge port side of the hopper main body, and even if the closed gate collides with the hopper main body, the gate comes into close contact with the hopper main body at the same time as the collision, and the gate vibrates at the time of collision. Can be rapidly attenuated immediately after the collision and the vibration noise can be attenuated, so that noise can be reduced.

According to the third aspect of the present invention, since the position is adjusted using the eccentric shaft member, there is no possibility that the position of the fixed center is displaced with time.

According to the fifth aspect of the invention, noise can be further reduced.

According to the sixth aspect of the present invention, the first projecting piece at the tip of the gate collides with the second projecting piece at the tip of the hopper to reduce the impact, so that noise can be further reduced.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing functions of a combination weighing device according to the present invention.

FIG. 2 is a perspective view showing a hopper device according to the first embodiment.

FIG. 3 is a side view showing the measuring head.

FIG. 4 is a perspective view showing an adjustment mechanism.

FIG. 5 is a side view showing a hopper device according to a second embodiment.

FIG. 6 is a side view showing a modification.

[Explanation of symbols]

 P: Hopper device 1: Rotating mechanism 6: Weighing hopper main body 7: Weight detector 8: Gate 10: Connecting link 13: Followed link 23: Drive arm 30, 30A: Adjustment mechanism T: Toggle link mechanism F1: First Fixed center F2: Second fixed center C1, C2: Moving center (permanent center)

Claims (7)

[Claims] 1. A hopper device for opening and closing a discharge port of a hopper body by rotating a gate via a rotation mechanism, wherein the rotation mechanism rotates in a forward direction and a reverse direction with a toggle link mechanism. And a driven link for rotating the gate in the opening direction and the closing direction via the toggle link mechanism, wherein the adjustment mechanism adjusts the position of the rotation end of the driven link corresponding to the closed state of the gate. A hopper device comprising: 2. The adjustment mechanism according to claim 1, wherein the adjustment mechanism adjusts the position of a fixed center of the toggle link mechanism to adjust the position of the rotation end of the driven link. Hopper device. 3. The apparatus according to claim 1, wherein the adjusting mechanism includes a shaft member forming the fixed center, the shaft member being attached to the hopper body so as to adjust a rotational position, and A hopper device in which the fixed center is provided eccentrically with respect to the rotation center of the member. 4. The arm-shaped bracket according to claim 1, wherein the adjusting mechanism includes an arm-shaped bracket, the bracket being attached to the hopper body so as to adjust the rotational position thereof, and an end of the arm-shaped bracket. A hopper device provided with the fixed center. 5. The input mechanism according to claim 1, wherein the input mechanism that applies a rotational force to the toggle link mechanism is a second input mechanism.
A hopper device formed of two links, wherein when the two links are substantially aligned, the two links of the toggle link mechanism are substantially aligned and the gate is closed. 6. The device according to claim 1, wherein lower ends of the gate and the hopper body are respectively provided.
First and second protruding pieces are provided which are in contact with each other. After the first protruding piece collides with the second protruding piece from the tip when the gate is closed, the first and second protruding pieces are elastically deformed, so that the impact when closing the gate is reduced. A hopper device for buffering. 7. A combination weighing device having a plurality of hopper devices and weighing devices according to claim 1.