JPH0624573A - Gate opening and closing mechanism of hopper - Google Patents

Abstract

PURPOSE:To open and close two gates independently or simultaneously with a single deiving device. CONSTITUTION:A first and second transmission rollers 56a and 56b connected to the first and the second gates 32a and 32b are installed with steps in the axial directions. When a cam body 30 provided between the transmission rollers are driven to rotate clockwise, the first abutting member 33a pushes the first transmission rollers 56a to open the first gate 32a, and when the cam body 30 is rotated counterclockwise, the second abutting member 33b pushes the second transmission roller 56b to open the second gate 32b. When the cam body 30 is driven clockwise by making the position to rotate the cam body 30 almost 180 deg. as the standard, the third and the fourth abutting members 33c and 33d push the first and the second rollers 56a and 56b almost simultaneously, so as to open the first and the second gates 32a and 32b simultaneously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hopper gate opening / closing mechanism having two gates which can be opened and closed independently.

[0002]

2. Description of the Related Art For example, as a hopper used for a combination weighing machine, two gates on the left and right are provided, and the gates on the left and right can be opened and closed independently on each side, or the two gates on the left and right can be opened and closed simultaneously. There is a structure that allows it.

A conventional gate opening / closing mechanism of a hopper provided with such two gates is constructed, for example, as shown in FIG. That is, the hopper main body 2 in which the upper and lower sides of the hopper 1 are open and the side wall 2a is in the shape of an inverted triangle.
Gates 4a and 4b are rotatably attached to the left and right sides of the side wall 2a by shafts 3a and 3b, respectively, and are biased in a closing direction by springs (not shown). Then, a driving lever for pressing the protruding portions 7a, 7b of the gates 4a, 4b to open the gates 4a, 4b so that the left and right gates 4a, 4b can be opened and closed individually or simultaneously. 6a, 6b and drive devices for driving them (for example, a motor or a cylinder) are provided on the left and right, respectively.

Then, for example, as shown in FIG. 14, a partition plate 11 is attached to a hopper body 2 to provide independent housings 1 on the left and right sides.
2a and 12b are formed to form the left and right storage portions 12a and 12
In the case where the objects to be weighed are accommodated for each b, the drive levers are operated by the drive devices on each side so that the gates 4a, 4
When b is individually opened and closed, and the partition plate 11 is removed to form one accommodating portion as shown in FIG. 13, the left and right drive levers are simultaneously operated to simultaneously operate the left and right gates 4.
a and 4b were opened and closed at the same time.

[0005]

However, in the conventional hopper, a drive device (not shown) for driving the two left and right drive levers 6a, 6b is used to open the left and right gates 4a, 4b. Since two are required, for example, when a large number of hoppers are used as in a combination weighing machine, if such two left and right driving devices are provided for each hopper, the entire apparatus of the combination weighing machine becomes significantly large. There was a problem that the cost was high.

It is an object of the present invention to solve the above problems and to provide a hopper capable of opening and closing the left and right gates individually and simultaneously opening and closing the left and right gates with a single drive. I am trying.

[0007]

In order to solve the above-mentioned problems, according to the present invention, a lower opening surface of a hopper body which is open at the top and bottom is rotatably attached to both sides of the hopper body. , A gate opening / closing mechanism of a hopper that opens and closes by a second gate, and an urging means for urging the first and second gates in respective closing directions, and the urging means are respectively connected to the first and second gates. First and second transmission members that receive a force in a predetermined opening direction and transmit a force in a direction opposite to the urging direction of the urging means to the first and second gates;
A rotatable cam that is arranged between the first and second transmission members and that opens and closes the first and second gates by bringing the outer peripheral portion into contact with or away from the first and second transmission members. A body and a rotation drive device that rotationally drives the cam body, wherein the first and second transmission members are arranged with a step in the axial direction of rotation of the cam body. A first pusher for pushing the first transmission member in the opening direction on the outer peripheral portion when the cam body rotates in a certain direction from a predetermined first reference angular position.
And a second contact portion that pushes the second transmission member in the opening direction when the cam body rotates in the opposite direction from the first reference angular position, and the cam body An angular position rotated by a predetermined angle from the first reference angular position is set as a second reference angular position, and when rotating from the second reference angular position in a fixed direction, the first and second transmission members are opened respectively. 3rd and 4th contact parts which push in a direction substantially simultaneously are provided.

[0008]

Thus, in the gate opening / closing mechanism of the hopper according to the present invention, when the cam body is rotationally driven from the first reference angular position in a certain direction, the first contact portion causes the first transmission member to move in the opening direction. When the first gate is opened by pushing to the second direction and is rotationally driven in the opposite direction, the second contact portion pushes the second transmission member in the opening direction to open the second gate. Further, when the cam body is rotationally driven from the second reference angular position in a certain direction, the third and fourth contact portions press the first and second transmission members substantially at the same time,
The second gate opens at about the same time.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a hopper of one embodiment, and FIG. 2 shows only the hopper body. The hopper body 21 has a quadrangular tubular shape including side walls 21a to 21d that are open at the top and bottom, and the lower sides of the opposing side walls 21a and 21b project downward in an inverted triangular shape as shown in FIG.

A U-shaped reinforcing plate 22 is fixed to the hopper body 21 on the side wall 21a side. This reinforcing plate 2
The flat plate 23 is fixed to the center of the flat plate 23, and the vertical plates 23a and 23b bent in the vertical direction from the left and right sides of the flat plate 23 are vertically displaced from each other to form two pins 24.
Projections a and 24b are provided.

As shown in FIG. 3, the upper pin 24a is inserted into the upper U-shaped engaging groove 27a of the rack 26 fixed to the outer surface of the polygonal cylindrical chassis 25 of the combination weighing machine main body from above. When engaged, the lower pin 24b comes into contact with the lower locking step 27b of the rack 26 and is pressed by the gravity of the hopper, and the hopper main body 21 moves to the chassis 25.
Supported by. Then, to remove it from the chassis 25, remove the lower pin 24b from the locking step 27b,
Lift up.

As shown in FIG. 3, the drive motor 2 installed on the inner surface side of the chassis 25 below the mount 26.
The rotating shaft 28a of 8 penetrates the front side of the chassis 25,
A cam body 30 is fixed to its tip.

The cam body 30 is the rotary shaft 2 of the drive motor 28.
S-shaped cam 31 formed in a substantially S-shape symmetrically with respect to 8a
And an oval cam 32 formed in a substantially oval shape are overlapped with each other.

The drive motor 28 is a pulse motor whose rotation angle can be easily controlled, and the angular position shown in FIG. 4A as viewed from the drive motor 28 side is the first reference angular position of the cam body 30. From this position, the cam body 30 is driven to rotate clockwise or counterclockwise by a certain angle, and the position shown in FIG. 4 (b) rotated approximately 180 degrees from the position shown in FIG. 4 (a) is changed to the second position. As the reference angular position, the cam body 30 is rotated clockwise from this angular position by a fixed angle.

The S-shaped cam 31 at the first reference angular position
A first contact portion 33a is formed on the outer periphery of the one end 31a side thereof to push the first transmission roller 56a described later upward to open the first gate 36a when rotated clockwise.
The outer periphery of the elliptical cam 32 on the opposite side of the first contact portion 33a, which has a larger curvature, pushes the second transmission roller 56b in the upper right direction when rotated counterclockwise, and the second gate 36b. The second contact portion 33b for opening the is formed.

The other end 31b of the S-shaped cam 31 and the outer periphery of the oval cam 32 having the smaller curvature have first and second transmission rollers 56a and 56b when rotated clockwise.
To the upper and upper right, respectively, and press the first and second gates 36
a and 36b open third and fourth contact portions 33c, 33
d is formed.

First and second gates 36a and 36b are rotatably mounted on the left and right sides of the side walls 21a and 21b of the hopper body 21 by shafts 35a and 35b, respectively. As shown in FIGS. 2 and 5, the first and second gates 36a and 36b are dish plates 37 that are inclined inward and downward, respectively.
a, 37b and side plates 38a, 38 provided upright on both sides thereof
b, and a bottom plate 37a of the first gate 36a is provided at its lower end with an extension portion 37a 'extending rightward from the center, and a lower end of the plate 37b of the second gate 36b is bent in an L-shape. Part 3
7b 'is provided, and the extended portion 37a' and the bent portion 37b 'are provided.
The and prevent the objects to be weighed from spilling in the closed state.

Reinforcing frame bodies 40a and 40b are covered and fixed to the outer sides of the upper ends of the first and second gates 36a and 36b.

As shown in FIG. 1, the first and second gates 36a, 3 are provided on the side walls 21a, 21b of the hopper body 21.
In order to prevent the movement of 6b from being prevented, shielding plates 41a and 41b are provided on the outer side of the lower side to prevent the objects to be weighed out from protruding sideways in a substantially triangular shape. One of the shield plates 41a has a stepped upper mounting piece 41a '.
Is fixed to the flat plate 23, and the other shield plate 41b is fixed to the side wall 21b by a bent portion (not shown) at its upper end. The left and right lower end portions of both shield plates 41a and 41b are connected and fixed by connecting plates 43a and 43b.

An L-shaped actuating plate 45a and a V-shaped actuating plate 45b are rotatably attached by shafts 44a and 44b at their intermediate portions to the lower left and right on the outer surface side of one shield plate 41a. There is.

Side plates 40a ', 40 of reinforcing frames 40a, 40b fixed to the first and second gates 36a, 36b.
The upper ends of the links 47a and 47b are rotatably attached to the protrusions of b'on shafts 46a and 46b, respectively. The lower ends of the links 47a and 47b and the upper ends of the operating plates 45a and 45b are rotatably connected by shafts 48a and 48b.

A shaft 49 is provided at the center of the links 47a and 47b.
a and 49b are attached, and between the shafts 49a and 49b,
A tension spring 51 is inserted through the notches 23a 'and 23b' of the vertical plates 23a and 23b. Due to the biasing force of the tension spring 51, as shown in FIG. 5, the left actuating plate 45a is centered on the shaft 44a and the link 47a is connected to the vertical plate 2a.
It rotates clockwise until it abuts on the lower end of 3a, and similarly, the right actuating plate 45b moves around the shaft 44b and the link 47b.
Rotates counterclockwise until the lower end contacts the lower end of the right vertical plate 23b, and the first and second gates 36a and 36b move to the shaft 3
5a and 35b are rotated counterclockwise and clockwise, respectively, and abutted against each other to hold the lower opening of the hopper body 21 in a closed state.

The one end 45b 'side of the right operation plate 45b is
It is bent higher than the middle part. Roller shafts 55a and 55b are vertically attached to the front end and the left end of the actuation plate 45a. The roller shafts 55a and 55b have first and second roller shafts 55a and 55b, respectively.
The second transmission rollers 56a and 56b are rotatably attached.

In FIG. 5, when the first transmission roller 56a receives an upward force as a force in the opening direction and rotates counterclockwise around the shaft 44a as a fulcrum, the upper end of the link 47a is pulled downward. The first gate 36a opens, and the second transmission roller 56b receives the force in the upper right direction as a force in the opening direction,
When the shaft 44b is rotated clockwise about the fulcrum, the link 47b is rotated.
Is pulled downward to open the second gate 36b.

When the hopper body is hung on the pedestal 26 of the chassis 25 of the main body of the combination weighing machine shown in FIG. 3 by the hanging pins 24a and 24b, the cam body 30 protruding to the outside of the chassis 25 is shown in FIG. 1st, 2nd as shown
When the gates 36a and 36b of the
It is located between the second transmission rollers 56a and 56b.
The position of the cam body 30 with respect to the hopper body 21 is
As shown in FIG. 6 as viewed in the direction of arrow A in FIG. 5, the outer circumference of the S-shaped cam 31 contacts the first transmission roller 56a and passes through the gap between the one end 45b ′ of the operating plate 45b and the shielding plate 41a. The first transmission roller 5 is located on the rotation surface, and the outer circumference of the elliptical cam 32 is in contact with the second transmission roller 56b.
It is determined to be located on the plane of rotation that passes over 6a. The S-shaped cam 31 and the elliptical cam 32 are integrated with a spacer 34 having a thickness corresponding to the step between the first and second transmission rollers 56a and 56b interposed therebetween.

Next, the operation of this embodiment will be described. As shown in FIG. 5, when the cam body 30 at the first reference angular position is driven by the drive motor 28 to rotate clockwise around the rotation shaft 28a by a constant angle, the cam body 30 is rotated as shown in FIG. The first contact portion 33a of the left operating plate 45a
The first transmission roller 56a is pushed upward. Therefore, the left actuating plate 45a rotates counterclockwise about the shaft 44a against the biasing force of the tension spring 51.
As a result, the reinforcing frame 4 receives the force from the link 47a.
Along with 0a, the first gate 36a on the left side rotates clockwise about the shaft 35a and opens. At this time, the second on the right
The gate 36b of the link 47 is linked by the urging force of the tension spring 51.
Since b remains in contact with the lower end of the vertical plate 23b,
It remains closed.

When the cam body 30 returns to the first reference angle position shown in FIG. 5, the actuating plate 45a is rotated clockwise by the urging force of the tension spring 51, and the link 47a abuts on the lower end of the vertical plate 23a. , The first gate 36a returns to the closed state.

On the contrary, when the cam body 30 rotates counterclockwise by a certain angle from the first reference angle position, as shown in FIG.
The second contact portion 33b of the cam body 30 has the right operating plate 45b.
The second gate 36b on the right side pivots counterclockwise about the shaft 35b and opens in order to push the second transmission roller 56b in the right upper direction, and when the cam body 30 returns to the first reference angle position. , Return to the closed state.

As described above, when the cam body 30 is driven to rotate clockwise or counterclockwise by a certain angle from the first reference angle position, the first and second gates 36a and 36b can be independently opened and closed. .

When the first and second gates 36a and 36b are simultaneously opened and closed, the cam body 30 is rotated by approximately 180 degrees clockwise from the first reference angle position shown in FIG. The second reference angle position is set as shown.

When the cam body 30 is driven to rotate clockwise by a certain angle from the state of FIG. 9, as shown in FIG.
The third contact portion 33c of the S-shaped cam 31 pushes the first transmission roller 56a upward, and at the same time, the fourth contact portion 33d of the oval cam 32 pushes the second transmission roller 56b upward. Therefore, the first and second gates 36a and 36b are simultaneously opened, and when the cam body 30 returns to the second reference angle position, the first and second gates 36a and 36b are pulled by the tension spring 51.
It closes almost simultaneously by the urging force of.

[0033]

Other Embodiments In the cam body 30 of this embodiment, the S-shaped cam 31 and the elliptical cam 32 are overlapped and integrated, but a cam body having the same outer peripheral shape may be used alone. .

In the above embodiment, the first and second gates 36a and 36b are opened by pushing the first transmission roller 56a upward and the second transmission roller 56b upward and rightward. This can be variously modified by the link mechanism. For example, when the opening direction of the first and second transmission members is the left-right direction, as in the cam body 60 shown in FIG. 11A, the outer peripheral shape in which the elliptical cam 61 and the triangular cam 62 are overlapped with each other. Of the elliptical cam 61, the first contact portion 6 of the elliptical cam 61 is rotated clockwise with the angular position as the first reference angular position.
3a pushes the first transmission roller 71a to the left to move the operating plate 7
Rotate 2a clockwise to rotate the first gate (not shown)
And the counterclockwise rotation causes the second contact portion 63b of the triangular cam 62 to push the second transmission roller 71b to the right to rotate the operating plate 72b counterclockwise to move the second plate. The gate (not shown) may be opened.

Then, the cam body 60 is rotated approximately 180 degrees from the first reference angular position, and the second body shown in FIG.
When the third contact portion 63c of the elliptical cam 61 is rotated to the reference angle position of the first transmission roller 71a.
Is pushed to the left and at the same time, the fourth contact portion 6 of the triangular cam 62 is
Since 3d pushes the second transmission roller 71b to the right, the first and second gates open simultaneously.

If such a cam body 60 is used, the first,
Since the direction of the force that the second transmission member (transmission roller) receives from the cam body coincides with the opening direction of the first and second gates,
It is also possible to omit the link mechanism and directly connect the first and second transmission members to the first and second gates, respectively.

Further, the first and second transmission members are not limited to the rollers as in this embodiment, but contact the four contact portions of the cam body to transmit the force in the opening direction to each gate. Any plate may be used as long as it is a plate body directly raised from the gate.

Further, in the above embodiment, the second reference angular position is a position obtained by rotating the cam body by approximately 180 degrees with respect to the first reference angular position. However, as shown in FIG. By using the cam body 90 having an outer peripheral shape in which the cam 91 and the triangular cam 92 are overlapped, it is possible to switch between single opening and closing and simultaneous opening and closing without rotating 180 degrees.

That is, when the cam body 90 is rotated counterclockwise with the state shown in FIG. 12 (a) as the first reference angular position, the first contact portion 93a of the L-shaped cam 91 becomes the first contact portion 93a. When the transmission roller 71a is pushed to the left and rotated clockwise, the second contact portion 93b of the triangular cam 92 causes the second transmission roller 7a to move.
Push 1b to the right. Then, when the cam body 90 is rotated counterclockwise by θ (or 360-θ clockwise) as the second reference angle position in the position of (b) in FIG. Third contact portion 9 of cam 91
3c and the fourth contact portion of the triangular cam 92 push the first and second transmission rollers 71a and 71b to the left and right, respectively.

[0040]

As described above, in the gate opening / closing mechanism of the hopper of the present invention, the cam body is arranged between the first and second transmission members respectively connected to the first and second gates, The first and second transmission members are arranged with a step in the axial direction of rotation of the cam body, and the first transmission member is pushed in the opening direction when the cam body rotates in a fixed direction from the first reference angular position. From the first abutment portion, the second abutment portion that pushes the second transmission member in the opening direction when rotating in the opposite direction, and the second reference angular position that is rotated by a predetermined angle from the first reference angular position. Third and fourth abutting portions that press the first and second transmission members in the opening direction substantially simultaneously when rotating in a fixed direction are provided on the outer peripheral portion of the cam body.

For this reason, the two gates can be opened and closed independently or simultaneously by simply rotating the cam body by one rotating drive device. If applied to a large number of hoppers, the entire weighing machine can be remarkably miniaturized and cost reduction can be realized.

[Brief description of drawings]

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

FIG. 2 is a perspective view drawn by removing a part of the embodiment of FIG.

FIG. 3 is a perspective view showing a main part on the chassis side to which the hopper of the embodiment of FIG. 1 is attached.

FIG. 4 is a front view showing a reference angular position of a cam body according to an embodiment.

FIG. 5 is a front view of an embodiment when the cam body is at the first reference angular position.

6 is a view of the main part of FIG. 5 viewed from the direction A. FIG.

FIG. 7 is a front view showing a state in which one gate is opened.

FIG. 8 is a front view showing a state in which the other gate is opened.

FIG. 9 is a front view of an embodiment when the cam body is at the second reference angular position.

FIG. 10 is a front view showing a state in which gates on both sides are simultaneously opened.

FIG. 11 is a schematic front view showing a main part of another embodiment of the present invention.

FIG. 12 is a schematic front view showing a main part of another embodiment of the present invention.

FIG. 13 is a schematic configuration diagram of a conventional hopper.

FIG. 14 is a diagram illustrating the use of a conventional hopper.

[Explanation of symbols]

 21 Hopper Main Body 23 Flat Plates 23a, 23b Vertical Plate 25 Chassis of Combination Weighing Machine Main Body 26 Stand 28 Drive Motor 30 Cam Body 31 S-Shaped Cam 32 Elliptical Cam 33a First Contact Part 33b Second Contact Part 33c No. 3rd contact part 33d 4th contact part 36a 1st gate 36b 2nd gate 45a 1st operating plate 45b 2nd operating plate 47a 1st link 47b 2nd link 51 Extension spring 56a 1st Transmission roller 56b Second transmission roller

Claims (1)

[Claims] 1. A gate opening / closing mechanism for a hopper that opens and closes a lower opening surface of a hopper body, which is open at the top and bottom, by means of first and second gates rotatably attached to both sides of the hopper body. Biasing means for biasing the first and second gates in respective closing directions, and biasing means for connecting the first and second gates to the first and second gates and receiving predetermined forces in the opening direction, respectively. A first force transmitting a force in a direction opposite to the biasing direction to the first and second gates;
It is arranged between a second transmission member and the first and second transmission members, and an outer peripheral portion is brought into contact with or separated from the first and second transmission members to separate the first and second gates from each other. A rotatable cam body that opens and closes, and a rotation drive device that rotationally drives the cam body, and the first and second transmission members have a step in the axial direction of rotation of the cam body. A first contact portion that is disposed on the outer peripheral portion of the cam body and that pushes the first transmission member in its opening direction when the cam body rotates in a certain direction from a predetermined first reference angular position. A second push member for pushing the second transmission member in its opening direction when the cam body rotates in the opposite direction from the first reference angular position;
Of the abutting portion of the cam and the cam body when the cam body rotates a predetermined angle from the first reference angular position as a second reference angular position, and when the cam body rotates in a certain direction from the second reference angular position, A gate opening / closing mechanism for a hopper, characterized in that it is provided with a third and a fourth abutting portion for pushing the first and second transmission members in the respective opening directions substantially at the same time.