JP3270788B2 - Motor support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a motor used in a rotary type level detector used for detecting the level of a granular material or a liquid in a container.

[0002]

2. Description of the Related Art A conventional example of a motor supporting structure of this kind will be described in detail by taking a rotary level detecting device as an example. That is, in FIG. 10, reference numeral 1 denotes a rotary level detecting device which is attached to a side wall of a tank (not shown) and detects the level of stored items. That is, the rotary level detecting device 1 includes a motor 2, a plate-like blade 5 connected to a rotating shaft 3 of the motor 2 via a joint 4, a case 10 for housing the motor 2, and the like. The rotary level detecting device 1 is positioned such that the plate-like blades 5 are housed in the tank, and is provided with bolts and the like through a plurality of mounting holes 6 formed in the mounting portion 10a of the case 10. Attached to the side wall of the tank.

Reference numeral 7 denotes a shaft, 8 denotes an oil seal, 9 denotes a cap nut, and 11 denotes a bearing having a bearing (not shown). Reference numeral 12 denotes a rotary drive device, the detailed structure of which will be described below with reference to FIGS.

That is, in FIG. 11 to FIG. 14, the rotating shaft 3 of the motor 2 extends both forward and backward of the motor 2 with a rotor (not shown) as a boundary.
Are provided to protrude outside the case. Also, the stator of the motor 2 (or a cover that covers the stator ,
A columnar pressing member 24 protrudes forward from a case of the motor 2 in parallel with the rotation shaft 3 of the motor 2 and a columnar boss 25 protrudes rearwardly.

A first frame 13 has a pair of limit switches 14 and 15 mounted on its front surface such that switch operating knobs 14a and 15a face each other, and a plurality of columns 16 standing on its rear surface. ing. The first frame 13 is provided with a bearing 17 for rotatably supporting a forwardly extending portion of the rotating shaft 3 of the motor 2, and the column-shaped pressing member 24 is provided above the bearing 17.
A large-diameter hole 90 through which is passed is provided. When the columnar pressing member 24 is displaced leftward or rightward as shown in FIG.
Press one of the operation knobs 14a, 15a,
Release the other from the pressed state.

Reference numeral 20 denotes a second frame, which is formed in an inverted L-shape in cross section and is attached to each of the distal ends of the plurality of columns 16 so as to maintain a constant distance from the first frame 13. The second frame 20 includes a motor 2
A bearing 22 that rotatably supports a rearwardly extending portion of the rotary shaft 3 is attached.

The rotating shaft 3 protruding forward and rearward of the motor 2 is supported by the bearings 17 and 22 so that the extended portion is supported by the entire motor 2. Have been. Above the bearing 22, a large-diameter long hole 91 through which a columnar boss 25 provided on the stator of the motor 2 passes is formed.

Reference numeral 26 denotes an attachment piece provided upright on the second frame 20. One end of a coil spring 27 is attached to the second frame 20, and the other end of the coil spring 27 is attached to a column boss 25. The first limit switch 14 is urged so as to press the switch operation knob 14a.

[0009] 28 is a terminal board mounting plate, wherein attached to the back side of the second frame 20, the motor 2 and not shown external driving circuit and a terminal board 29 is screw leads for electrical connection is connected 30 is attached and fixed. The lead wire is drawn out from a large-diameter lead wire outlet 31 provided on the lower side of the case 10. Reference numeral 32 denotes a cap of the case 10, and reference numeral 33 denotes a waterproof rubber seal member.

Note that there are two limit switches (reference numeral 1).
4 and 15) are provided.
Even if the rotation direction of the rotating shaft 3 of the motor 2 changes depending on the purpose, one device can be used in common.

In the above configuration, when the level of the object stored in the tank has not reached the detection level, the blade 5 is driven to rotate in one direction by the motor 2 via the shaft 7. At this time, the motor 2 has the rotating shaft 3 supported by the bearings 17 and 22, and the columnar boss 25 fixed to the stator is pulled in the direction of the mounting piece 26 by the coil spring 27 so that the two frames 13 and 20 ( Alternatively, the stator of the motor 2 is stopped as if it were fixed and supported with respect to the case 10). Thus, the columnar pressing member 24 is at the position indicated by the solid line in FIG. 12 and constantly presses the switch operating knob 14a of the first limit switch 14.

Next, when the level of the object to be measured reaches the detection level, the object to be measured becomes an obstacle to the rotation of the blades 5 and a large load is applied to the rotation of the motor 2. When the value exceeds a predetermined size, the rotation of the rotating shaft 3 of the motor 2 is stopped. As a result, the columnar boss 25 is displaced in the left direction in FIG. 13 (the direction in which the coil spring 27 is stretched) as the stator of the motor 2 tries to rotate in the opposite direction to the rotation direction of the rotating shaft 3.

[0013] In other words, by pulling in the direction of extending the coil spring 27, in FIG. 12, the stator is rotated in the arrow right rotational direction, the columnar pressing member 24 of the stator
By but displaced to a position indicated by a chain line in FIG 12, the switch operation knob 1 of the first limit switch 14
The pressed state of 4a is released, the switch operating knob 15a of the second limit switch 15 is pressed, and the external circuit detects that the object to be measured has reached a predetermined level.

[0014]

However, in the above configuration, the rotating shaft 3 of the motor 2 is
The motor 2 is provided so as to extend in both the front and rear directions of the motor so as to protrude outside the case, and is configured to rotatably support the motor 2 at a portion of the rotating shaft before the protruding portion. The motor 2 is not commercially available, and the motor 2 must be specially designed and manufactured in accordance with the specifications, resulting in an increase in cost.

Therefore, if the center axes of the bearings 17 and 22 and the rotary shaft 3 are slightly displaced, there is a problem that the load applied to the rotary shaft 3 becomes extremely large.

If the size of the hole of the bearing through which the rotary shaft passes becomes large, there is a fear that the whole weight of the motor must be received by one of the bearings. If this occurs, the motor may vibrate due to the vibration of the rotating shaft 3 and the microswitch may malfunction.

The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to use a motor whose rotating shaft projects outside the case in only one direction.

[0018]

SUMMARY OF THE INVENTION The present invention, in order to achieve the above object, a motor fixing plate bearing is provided the rotary shaft of the motors is rotatably supported the combined Resid Yafuto, wherein It is mounted rotatably around a bearing ,
One stator mounting plate stator fixedly mounted in said motor, and a rotation preventing means for preventing rotation of the stator resiliently relative to the motor fixing plate, said motor
The rotating shaft of the motor protrudes out of the motor case only in one direction
It is a motor support structure .

[0019]

[Function] An inexpensive general-purpose motor can be mounted by simply connecting the rotating shaft protruding to one side from the motor to the shaft and fixing the stator to the stator mounting plate with screws or the like. And an inexpensive motor support structure can be proposed.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment according to the present invention will be described below in detail with reference to the same rotary type level detector as that shown in the conventional example. First, in FIGS. 1 to 9, the same or equivalent components as those described in the conventional example shown in FIGS. 10 to 14 are denoted by the same reference numerals, and detailed description thereof will be omitted.

Reference numeral 40 denotes a third frame (motor fixing plate) .
The lower part of one metal plate from the center is 90
The terminal board mounting portion 40a is formed at the last bent portion of the terminal board by being bent at 90 degrees and the tip portion is further bent upward by 90 degrees. That is, the terminal board mounting portion 4 0 a is formed on the peripheral intermediate portion of the tip said upwardly bent 90 degrees.

[0022] Incidentally, this large notches 4 1 intended to strike a path through to the loading and unloading of the motor 2 when mounting the motor 2, is the following attached spatial portion of the notch portion 4 1 Motor 2 Is not located.

The third frame 40 includes the blades 5
A bearing 42 is provided for rotatably supporting a second shaft 99 connected via a joint 4 to the first shaft 7 attached to the first shaft 7. The portion indicated by reference numeral 3 7 is a joint body, and the terminal board mounting portion 40
a has a hole 40 for attaching the terminal board 29 with the screw 30.
b is drilled.

Reference numerals 43 and 44 denote a pair of movable pieces arranged in a symmetrical shape, and are urged by the coil spring 27 in the direction of always approaching each other, that is, inwardly of each other.
Normally, opposing sides 43a, 44 are provided on both side surfaces of a stopper 40c cut and raised forward from the third frame 40.
a is in contact, and are each movable piece 43, 44 attached to the third frame 40 for rotation about a rotation axis 4 6. The pair of movable pieces 43 and 44 and
The ill spring 27 is attached to the third frame (motor fixing plate) 40.
Rotation preventing means for elastically preventing the rotation of the stator with respect to the rotation
Is configured.

Further, between the opposing sides 43a, 44a of the pair of movable pieces 43, 44, a pressing operation piece 50b cut forward from a stator mounting plate 50, which will be described later, is also positioned. The pressing piece 50b is positioned below the stopper 40c, and its width is set smaller than the width of the stopper 40c.

Reference numeral 45 denotes a switch actuating member fixedly mounted on the upper portion of the third frame 40, formed in an L-shaped cross section, and has two adjacent convex portions 45a directed downward on its lower surface. , 45b are formed in a trapezoidal shape,
Actuating pieces 14 c , 1 of two first and second limit switches 14, 15, which will be described later, are formed on the respective convex portions 45 a, 45 b.
5 c of attached to the end roller 14b, 15b to move while rolling. That is, the rollers 14b, 15b
Are turned on when located on the convex portions 45a and 45b, and turned off when not located on the convex portions 45a and 45b.

The lengths of the flat tops of the convex portions 45a and 45b formed on the switch operating member 45 are set to be different.

Numeral 50 denotes a stator mounting plate formed in an inverted triangular shape.
The bearing 42 is rotatably attached to the bearing 42 attached thereto, and is held down by an E-link or the like so as not to be detached from the bearing 42. The upper end edge 50a of the stearyl over data mounting plate 50, it becomes a horizontal state during normal, pressed operates as the central portion of the upper end edge 50a is positioned between the pair of movable pieces 43, 44 The piece 50b is cut and raised at a right angle.

The stopper 40c of the third frame 40
A substantially rectangular hole 40d is formed in the lower side where the pressing operation piece 50b is displaced left and right in the hole 40d, and the lateral edges 40e and 40f of the hole 40d are formed.
Has a stopper function of the pressing operation piece 50b. In addition, 2 located above the stator mounting plate 50
Bosses 51, 51 are provided upright at the respective corners, and the mounting portions 2a, 2a of the motor 2 are screwed to the bosses 51, 51 by bolts and fixed.

Reference numeral 99 denotes a second shaft, which is a rotary shaft 3 of the motor 2 (having a cylindrical shape and a flat portion 3a
Is formed, and an engaging hole 99a is formed therein, and a flat portion 99b is formed in a part of the inner peripheral surface thereof.

Next, a rotary level detector for explaining the present invention will be described with reference to FIGS. First, when the motor 2 is attached to the third frame 40, while the terminal board 29 that are not yet mounted, the space formed of the motor 2 terminal board mounting portion 4 0 a, between 40a, i.e. notches 4 1 rotary shaft 3 is brought close to the engagement Goana 99a of the second shaft 99 through,
Then, by rotating the second shaft 99 manually, the positions of the two flat portions 3a and 99b are made to coincide with each other, and the rotating shaft 3 is inserted into the engagement hole 99a of the second shaft 99, and outwardly from both sides of the stator. Overhanging mounting part 2
a, 2a are positioned on the corresponding bosses 51, 51, respectively, and attached to the third frame 40 by being screwed together with screws.

As a result, the rotating shaft 3 of the motor 2 and the second
The connection with the shaft 99 is made by the engagement hole 9 of the second shaft 99.
9a, the rotation of the rotating shaft 3 of the motor 2
The light can be transmitted to the blade 5 via the shaft 99.
In addition, as shown in FIG.
Protrudes out of the case of the motor 2 only in one direction (forward)
You.

Under such a configuration, the motor 2 is driven to rotate in one direction, and when the level of the object stored in the tank has not reached the detection level, the blade 5
Is rotationally driven at a predetermined rotational speed by a motor 2 via a shaft 7.

At this time, the motor 2 that is driven to rotate in a no-load state or in a state close to it has a second shaft 99.
6 is supported by the bearing 42 and the stator mounting plate 50 to which the stator is fixed is maintained in a horizontal state at the upper edge 50a as shown by a solid line in FIG. 6, and as shown in FIG.
The pressing piece 50b is located immediately below the stopper 40c.
As shown in FIG. 2, opposing sides 43a, 44a of a pair of movable pieces 43, 44 are in contact with both side surfaces of the stopper 40c. At that time, a pair of limit switches 14,
15 of the roller 14b, each of 15b, are maintained in a state of riding on the flat top of the convex portions 45a, 45b as shown by the solid line in FIG.

When the level of the object reaches the detection level, the object becomes an obstacle to the rotation of the blades 5 and acts as a large load on the motor 2. As a result, the rotation of the rotating shaft 3 of the motor 2 is reduced, and thereafter, the rotation of the rotor of the motor 2 is stopped by applying an excessive load to the motor 2. 6 to rotate the stator mounting plate 50 in the direction A as shown in FIG. 6 (indicated by a dashed line in FIG. 6), and one movable piece 43 is opposed to the pulling force of the coil spring 27 by the pressing operation piece 50b. It is displaced while rotating in the direction B shown in FIG.

Accordingly, the limit switch 1
Each of the rollers 14a and 15b of 4 and 15 has a convex portion 45.
a, 45b (shown by broken lines in FIGS. 6 and 7 ) from the flat portions of the limit switches 14, 1b.
5 by displacing the switch operating pieces 14 c and 15 c upward,
By changing both of the limit switches 14 and 15 from the ON state to the OFF state, the external circuit detects that the measured object has reached the predetermined level.

When the object to be measured is dropped from above and stored in the tank, even if the object to be measured hits the blades 5 and a large external force is applied to the blades 5 impulsively, the stator side of the motor 2 is , The limit switches 14 and 15 are not actuated by vibration. That is, the stator of the motor 2 is fixed to the stator mounting plate 50 having the bearing 42 as the center of rotation, and the number of movable parts is smaller than that of the conventional example.

[0038]

As described above, according to the present invention,
Since an inexpensive motor having a rotating shaft on only one side can be used, the effect of reducing the cost of the apparatus is exhibited.

[Brief description of the drawings]

FIG. 1 is an explanatory side view of a rotary level detecting device for explaining an embodiment according to the present invention.

FIG. 2 is an explanatory front view of the rotary level detecting device in FIG. 1;

FIG. 3 is a side sectional view of a main part of the rotary level detecting device shown in FIG. 1;

FIG. 4 is an explanatory diagram viewed from a direction in which a rotation shaft 3 of a motor 2 in FIG. 1 does not protrude.

FIG. 5 is an explanatory view of a main part of the rotary level detecting device of FIG. 1 as viewed from the rear.

FIG. 6 is an operation explanatory view showing an operation state of the stator mounting plate 50 when the blade 5 is rotating normally and when a large load is applied.

FIG. 7 shows rollers 14b and 15b of limit switches 14 and 15 which are provided on the stator mounting plate 50 so as to be overlapped with each other.
FIG. 7 is an explanatory view showing a state in which is stopped at the top of a convex portion 45b of the switch operating member 45.

FIG. 8 is an explanatory diagram when a large load acts on the rotating shaft 3 of the motor 2 to operate the movable piece 43.

FIG. 9 is a structural explanatory view showing how the rotation shaft 3 of the motor 2 and the second shaft 99 are engaged.

FIG. 10 is an explanatory sectional view of a conventional rotary level detecting device.

FIG. 11 is an explanatory side view showing an entire conventional rotary drive device (connected to a shaft).

FIG. 12 is an operation explanatory diagram when the entire rotary drive device of FIG. 11 is viewed from the front.

FIG. 13 is a structural explanatory view when the entire rotary drive device of FIG. 11 is viewed from the rear.

FIG. 14 is an explanatory side sectional view of a main part of FIG. 11;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rotary level detector 2 Motor 3 Rotating shaft 4 Joint 5 Blade 7,99 Shaft 10 Case 11 Bearing 12 Rotation driving device 13,20 First and second frame 14,15 Limit switch 14a, 15a Knob 14a for operation , 15b Rollers 14c, 15c Working piece 16 Post 17, 22, 42 Bearing 24 Column pressing member 25 Column boss 26 Mounting piece 27 Coil spring 27, 43, 44 Rotation preventing means 28 Terminal board mounting plate 29 Terminal board 31 Lead wire outlet 32 cap 33 sealing member 40 motor fixing plate (third frame) 40c stopper 40d holes 43, 44 movable piece 45 the switch actuating member 50 stearyl over data mounting plate 50a upper edge 50b pressing operation piece 51 boss 90 bore 91 slots

Claims (1)

(57) [Claims] 1. A M o and other rotating shaft coupled motor fixing plate bearing is provided for rotatably supporting the Cie Yafuto rotatably mounted to the bearing as an axis, and before
A stator mounting plate serial motor stator is fixedly mounted, the rotation of the stator relative to the motor fixing plate and a rotation preventing means for resiliently inhibiting, the outside of the case of the rotation shaft of the motor the motor Only in one direction
Protruding motor support structure.