KR0158910B1 - Support structure of motor - Google Patents

Abstract

For a motor device such as a rotary level detection device, only the motor can be easily replaced, and the number of parts can be reduced by allowing the motor whose output shaft protrudes in only one direction to be used.

The motor device 1A includes a fixed member 40 provided with a bearing 42 for supporting a drive shaft 99 to which the output shaft 3 of the motor 2 is coupled, the fixed member 40, and the motor ( 2) between the movable member 50, which is rotatably attached to the fixing member 40 concentrically with the output shaft 3, and on which the casing 200 side of the motor 2 is fixed; A rotation blocking means (K) for adding an elastic force to the casing (200) in a direction of preventing relative rotation of the casing (200) with respect to the fixing member (40), and the elastic blocking force of the rotating blocking means (K). Switch means 14 and 15 for detecting when the casing 200 of the motor 2 is rotated by a predetermined angle or more are provided.

Therefore, the motor 2 can be detached only by releasing the fixing attachment means such as the attachment screw from the movable member 50.

Moreover, as the motor 2, what the output shaft 3 protruded only to one side in the axial direction can be used.

Description

Motor

1 is a longitudinal side view showing a rotary level detection device according to an embodiment of the present invention.

2 is a front view showing the rotary level detection device of FIG.

3 is a side view showing the main part of the level detecting apparatus of FIG.

4 is a rear view of the motor of FIG. 1 seen from the rear in the axial direction in which the output shaft does not protrude.

5 is a rear view of the main portion of the rotary level detection device of FIG.

Fig. 6 is an operation explanatory diagram showing an operation state of the movable member when the vane of Fig. 1 is rotated normally and a large load is applied.

FIG. 7 is a rear view showing a state where the rollers of the limit switch, which are overlapped with two movable members, are stopped at the top of the convex portion of the switch operating member.

8 is a rear view showing a state in which a large load is applied to the output shaft of the motor to operate the movable member.

9 is a perspective view showing the engagement operation between the output shaft and the drive shaft of the motor.

10 is a longitudinal side view showing a conventional rotary level detection device.

11 is a side view showing the whole of the rotary drive means built in the conventional rotary level detection device.

12 is a front view showing the whole of the rotation driving means of FIG.

FIG. 13 is a rear view showing a case where the entire rotary drive means of FIG. 11 is viewed from the rear in the axial direction (right side of FIG. 10).

14 is a side view showing the main part of FIG.

* Explanation of symbols for main parts of the drawings

1A: rotary level detection device 2: motor

3: output shaft 7: spindle

10: case 42: bearing

12: rotation drive means 40: fixed member

14,15: limit switch 14a, 15a: operating piece

14b, 15b: roller 27: coil spring

31: lead wire outlet 32: cap

40c: Stopper 43,44: Moving piece

45: switch operating member 50: movable member

50b: pressing operation piece 99: drive shaft

The present invention relates to a motor device for use in a rotary level detection device that detects the level of a particle such as cement or flour in a container, for example.

A conventional example will be described in detail with this type of motor apparatus as a rotary level detecting apparatus as an example.

That is, in FIG. 10, 1 is a rotary level detection device, which is attached to the side wall of a tank (not shown) to detect the level of the object.

That is, the rotary level detection device 1 includes a rotary drive means 12 having a motor 2, a spindle 7 coupled to an output shaft 3 of the motor 2 via a joint 4A, and A plate blade (5) attached to the distal end of the spindle (7) and a case (10) for accommodating the motor (2) are provided.

The rotary level detection device 1 is positioned so that the plate blade 5 is accommodated in the tank, and is attached to the side wall of the tank by a bolt or the like through a plurality of attachment holes 6 drilled in the attachment portion 10a of the case 10. Attached.

Moreover, the said spindle 7 is supported by the bearing part 11 which has the metal bearing 11a and the ball bearing 11b in the state sealed by the oil seal part 8 and the box nut 9.

Next, the detailed structure of the rotation driving means 12 will be described with reference to FIGS. 11 to 14.

That is, in Fig. 11, the output shaft 3 of the motor 2 extends in both the axial front and the axial rear of the motor 2, and protrudes out of the casing 21 of the motor 2 to be installed. It is.

Moreover, the columnar press member 24 protrudes toward the axial direction parallel to the output shaft 3 of the said motor 2 from the casing 21 of this motor 2, and the columnar boss 25 is a shaft. It protrudes toward the direction back, and is provided.

13 is the first frame, and as shown in FIG. 12, a pair of limit switches 14 and 15 are attached to switch operation knobs 14a and 15a facing each other. Moreover, the some pillar 16 is provided in the back surface.

Moreover, as shown in FIG. 14, the part extended in the axial direction of the output shaft 3 of the motor 2 is fitted in the bearing part 17A of the joint 4A which penetrated the 1st frame 13, The large diameter hole 90 through which the columnar pressing member 24 passes is provided in the first frame 13, and is fixed to the bearing 17A by a screw 68.

As the columnar pressing member 24 is displaced in the left or right direction as shown in FIG. 12, one of the operation knobs 14a and 15a of the limit switches 14 and 15 is pressed. , Release the other side under pressure.

The spindle 7 is non-rotatively connected to the joint 4A by the elastic catching member 67A fitted to the notch portion 66A of the joint 4A. The spindle 7 is a ball bearing of FIG. The output shaft 3 of the motor 2 is supported by the front and back two bearings 17A and 22 in the state supported by the bearing part 11 via 11b).

20 is a second frame, the cross section of which is formed in an inverted L shape, is attached to each of the front end of the plurality of struts 16 installed in the first frame 13, a predetermined interval between the first frame (13) Is keeping.

In addition, a bearing 22 is attached to the second frame 20 to rotatably support a portion of the output shaft 3 of the motor 2 that extends in the rearward direction in the axial direction.

Moreover, the output shaft 3 which protrudes in the axial front and the axial rear of the said motor 2, and is extended is supported by the said bearing 17A, 22 of both sides, and the motor 2 The whole is supported.

Moreover, as shown in FIG. 13 and FIG. 14, the large diameter long hole 91 through which the columnar boss 25 provided in the casing 21 of the said motor 2 passes through the bearing 22 is opened. have.

26 is an attachment piece installed upright on the second frame 20. As shown in FIG. 13, one end of the coil spring 27 is attached, and the other end of the coil spring 27 is a columnar boss 25. As shown in FIG. ), And the columnar pressing member 24 presses the switch operation boss 14a of the first limit switch 14 through the casing 21 of the motor 2.

28 is a terminal board attaching plate, which is attached to a rear side of the second frame 20, and a terminal board 29 to which a lead wire for connecting the motor 2 and a driving circuit attached to the outside (not shown) is connected. It is attached and fixed by this bolt 30.

The lead wire is drawn out from the large-diameter lead-out port 31 provided below the case 10 of FIG.

32 is a cap of the case 10, 33 is a waterproof rubber seal member.

In the above configuration, when the level of the measured object stored in the tank does not reach the detection level, the vanes 5 of FIG. 10 are driven in one direction A (FIG. 12) via the spindle 7 by the motor 2. It is rotating to the side.

At this time, the motor 2 has an output shaft 3 supported by both bearings 17A and 22, and the columnar boss 25 fixed to the casing 21 is connected to the coil spring 27 of FIG. By admitting in the direction of the attachment plate 26 by this, it is finally fixed and supported with respect to both the frames 13 and 20 (or the case 10), and the casing 21 of the motor 2 is stopped. Is in.

For this reason, the press member 24 is in the position shown by the solid line in FIG. 12, and presses the switch operation boss 14a of the 1st limit switch 14 always.

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 vanes 5 and becomes a large load to the rotation of the motor 2, and the magnitude of the load is predetermined. When the size exceeds, the rotation of the output shaft 3 of the motor 2 is stopped.

As a result, the casing 21 of the motor 2 tries to rotate in the opposite direction B from the rotation direction A of the output shaft 3, so that the columnar boss 25 is leftward B in FIG. (The direction in which the coil spring 27 is pulled) is displaced.

In other words, in FIG. 12, the casing 21 rotates in the arrow right direction B by pulling the coil spring 27 in the extending direction, and the pressing member 24 of the casing 21 is rotated in FIG. Displaced to the position indicated by the dashed line.

For this reason, the pressing state of the switch operation boss 14a of the 1st limit switch 14 is canceled | released, and the to-be-measured object is a predetermined level by the external circuit not shown connected to this 1st limit switch 14. While detecting that it has reached, the switch operating boss 15a of the second limit switch 15 is pressed, and the motor 2 is controlled by a motor control circuit (not shown) connected to the second limit switch 15. Stop the drive.

However, in the above-described configuration, when the motor 2 fails or reaches the maximum endurance life, after removing the cap 32 of FIG. 10, the lead wire attachment screw 30 of the terminal board 29 is loosened, and the lead wire is It was complicated to draw out from the drawer 31 and take out the whole of the rotary drive apparatus 12 from the case 10. FIG.

In addition, when attaching, the whole rotation drive apparatus 12 is inserted in the case 10, the lead wire is inserted from the lead wire outlet 31, and it pulls in the direction of the cap 32 in the narrow space in the case 10. In addition, in FIG. Pulled and screwed to the terminal board 29 by the lead wire attachment screw.

By the way, since the flap 5 receives a rotational force by the flow of an injection | pouring body in a tank, this rotational force is transmitted to the motor 2, and gives the motor 2 the fluctuation | variation of a large rotational torque, and therefore the durability of the motor 2 is carried out. This degrades.

On the other hand, as a recent trend of users, there is a desire to reduce maintenance costs by replacing only broken parts.

Therefore, in order to answer this, when only the short-lived motor 2 is to be replaced, the entire rotary drive device 12 is lifted up, the bolts are removed, and both the first frame 13 and the second frame 20 are disassembled. Since the motor 2 needs to be replaced and reassembled, there is a problem that it is economical to replace the entire rotary drive device 12 because a great deal of labor is involved.

Further, in the above configuration, the output shaft 3 of the motor 2 extends to both front and rear of the motor 2 so as to protrude out of the case of the motor 2, and the bearings 17A, 22 at the protruding portion thereof. Since the motor 2 is rotatably supported by the < RTI ID = 0.0 >), parts such as the columnar boss 25, the attachment piece 26, the bearing 22, etc. are necessary to the rear of the motor 2, Part scores increased, causing cost ups.

In addition, since the first limit switch 14 for level detection needs to be operated before the second limit switch 15 for motor stop, the rotation direction of the output shaft 3 of the motor 2 is limited to one direction.

For this reason, it is necessary to add the latch mechanism provided with the rotation direction control means for preventing reverse rotation, for example, a cam plate, and the hook which engages with this and prevents reverse rotation inside the motor 2, The structure of the motor 2 was complicated.

Moreover, there existed a problem that the load applied to the output shaft 3 became extremely large if the central axis of both bearing 17A, 22 and the output shaft 3 shifted even a little.

The present invention has been made in view of the above problems, and its first object is to facilitate replacement of the motor only.

The second object is to reduce the number of parts and to realize cost down.

In order to achieve the first object, the motor apparatus according to the present invention is provided with a fixing member provided with a bearing for supporting a drive shaft to which the output shaft of the motor is coupled, and disposed between the fixing member and the motor, A movable member which is rotatably attached to the output shaft and fixed to the casing side of the motor, and rotation stopping means for adding an elastic force to the casing in a direction of preventing relative rotation of the casing with respect to the fixed member; It is provided with switch means which detects when the casing of the said motor rotates more than predetermined angle in opposition to the elastic force of this rotation stopping means.

According to this configuration, the motor can be detached only by loosening the fixing attachment means such as the mounting screw from the movable member, thereby facilitating replacement of the motor.

In order to achieve the second object, in the motor device according to the present invention, in addition to the configuration for achieving the first object, the output shaft of the motor protrudes from the casing only in the axial direction.

According to this configuration, since the output shaft protruding from the casing of the motor to only one side in the axial direction can be coupled to the drive shaft, and the motor can be attached simply by fixing the casing to the movable member with screws or the like, the other side of the casing Since the parts of the bearing 22, columnar boss 25, and attachment piece 26 of FIG. 10 become unnecessary, the number of parts is reduced and a cheap motor device can be provided.

In addition, according to a preferred embodiment of the present invention, the rotation stopping means is supported by the fixing member and a pair of movable pieces, which sandwich the pressing operation pieces formed on the movable plate before and after the rotational direction of the motor, and the movable pieces It has a spring.

For this reason, even when the motor output shaft rotates in any direction, the casing can be prevented from rotating.

According to another preferred embodiment of the present invention, the fixing member has a terminal attachment portion located in the axial rear of the motor, and these terminal attachment portions have a notch portion through which the motor is inserted.

For this reason, by moving the motor 2 along an axial direction, removal and attachment become possible, and a work | work improves.

According to another preferred embodiment of the present invention, the switch means is a limit switch having a roller at the end of the switch operation piece, the limit switch is supported on one side of the fixing member and the movable member, and the roller on the other side. A cam surface is installed to operate the switch by touching.

According to this, the timing of switching can be shifted | deviated by changing the magnitude | size of a cam surface.

Therefore, for example, as in the embodiment, a plurality of switching means 14, 15 are provided, and various control timings are possible by varying the timing of switching with each other.

According to another preferred embodiment of the present invention, there is provided a case for receiving the rotary drive means including the motor, the fixing member and the movable plate, and for supporting the spindle connected to the output of the motor from the shaft, A flange attached to the wall of the container containing the object to be measured, wherein the spindle protrudes outward from the case, penetrates the wall and is inside the container T, and a wing is attached to the protruding tip thereof. have.

According to this structure, the level detection apparatus which detects the level of the to-be-measured object like a powder sieve is obtained.

EXAMPLE

Hereinafter, the structure of the Example which concerns on this invention is demonstrated in detail using 1 A of rotary level detection apparatuses corresponding to what was shown by the prior art example.

First, in FIGS. 1 to 9, the same or equivalent components as those described in the conventional examples shown in FIGS. 10 to 14 are denoted by the same reference numerals, and detailed description thereof will be omitted.

40 in FIG. 1 is a fixing member of the motor 2, and a sheet of metal is bent 90 degrees downward from the center portion thereof to the rear, and the tip portion thereof is bent upwards 90 degrees again to wire the bent portion. The substrate support part 40a is formed.

The substrate mounting support 71 is fixed to the wiring board support part 40a with a screw 72, and the wiring board 74 is attached to the distal end of the support 71 with a screw 73.

An engaging piece 75 is formed at an upper end of the wiring board attaching part 40a, and an upper end of the wiring board 74 is engaged with the engaging groove 76 to be fastened by the screw 73. In accordance with the fixing portion, the wiring board 74 is securely stored.

As shown in FIG. 2 (front view), the fixing member 40 is provided with a large notch portion 41 through which the motor 2 is inserted.

The hole 40b formed in the wiring board support part 40a is an insertion hole of the screw 72 for the support 71.

As shown in FIG. 5 (back view), the connector boards 78 and 78 and the terminal board 79 are attached to the wiring board 74.

As shown in FIG. 1, the connectors 78 and 78 are connected to the lead wire L1 of the motor 2, and the terminal board 79 has two limits described later through the wiring board 74. FIG. The external lead wire L3, which is connected to the lead wires L2 of the switches 14 and 15, and connected to an external circuit, is connected with a screw 80 (FIG. 5).

The lead wires L2 from the above limit switches 14 and 15 are guide pieces 82 formed by cutting the fixing member 40 and guide grooves 83 formed in the wiring board support 40a of FIG. Guided.

In the wiring board support portion 40a, an attachment hole 85 for attachment is formed in the case 10 described later.

In addition, a bearing 42 is rotatably fitted in the fitting hole 49 of the fixing member 40 shown in FIG. 3, and the bearing 42 is connected to the spindle 7 via the joint 4. The drive shaft 99 is rotatably supported.

The drive shaft 99 is prevented from being separated from the front (left) with respect to the bearing 42 by the snap ring 53.

The front surface of the fixing member 40 is provided with a rotation blocking means K for preventing relative rotation of the casing 200 (FIG. 3) of the motor 2 with respect to the fixing member 40.

The rotation stopping means K includes a pair of movable pieces 43 and 44 and a coil spring 27 shown in FIG. 2, and the pair of movable pieces 43 and 44 are symmetrical left and right. The coil springs 27 are operated by the coil springs 27 so as to always approach each other, that is, inward to each other, and to both sides of the stopper 40c which are normally cut forward from the fixing member 40. Opposite sides 43a and 44a abut against each other, and each of the movable pieces 43 and 44 is supported by the fixing member 40 so as to rotate about the front axis 46.

Moreover, between the side 43a, 44a which the said pair of movable pieces 43 and 44 oppose each other, the press-operation piece 50b mentioned later cut | disconnected and moved forward from the movable member 50 is inserted. Thus, the motor 2 is fitted in front and rear of the rotation direction A of the motor 2.

Moreover, the pressing operation piece 50b is located below the said stopper 40c, and the horizontal width dimension is set smaller than the horizontal width dimension of the stopper 40c.

45 in FIG. 1 is a switch actuating member fixedly attached to the upper portion of the fixing member 40. As shown in FIG. 3, the cross section is L-shaped, and two adjacent convex portions are provided on the lower side thereof downward. As shown in FIG. 7, the first and second limit switches 14, 45a and 45b, which are formed in a large phase and each of the convex portions 45a and 45b are described later, The rollers 14b and 15b attached to the distal end of the operating pieces 14a and 15a of (15) move while rolling.

That is, each of the rollers 14b and 15b is turned on when positioned on the convex portions 45a and 45b and turned off when not positioned on the convex portions 45a and 45b.

In addition, the lengths of the flat top portions of the convex portions 45a and 45b formed on the switch operation member 45 are set differently.

50 is a movable member, which is formed in an inverted triangle, as shown in FIG. 5, and the bearing is rotatably supported by the fixing member 40 in the mounting hole 59 formed in each of the lower portions thereof. 42) is press-fitted and fixed.

The upper edge 50a of the motor mounting plate 50 is usually in a horizontal state, and is located between the pair of movable pieces 43 and 44 at the center of the upper edge 50a. The pressing operation piece 50b is cut out at right angles.

As shown in FIG. 6, the first and second limit switches 14 and 15 overlap with the movable member 50, and are fixed by two screws 53 and 53. As shown in FIG.

As shown in FIG. 7, a substantially rectangular hole 40d is drilled in the lower side where the stopper 40c of the fixing member 40 is provided, and the pressing operation piece 50b is formed in the hole 40d. ) Is shifted to the left and right, and the side edges 40e and 40f on the side of the hole 40d have a stopper function of the pressing operation piece 50b.

In addition, as shown in FIG. 6, bosses 51 and 51 are provided at each of the two corner portions located above the movable member 50 by means such as caulking or welding. 51 and 51, the attachment portions 2a and 2a of the motor 2 in FIG. 4 are fitted and fixed by bolts 55 (FIG. 1).

As shown in FIG. 9, the flat part 3a is formed in a part of the main surface of the circumferential motor output shaft 3, and the said output shaft 3 is engaged with the drive shaft 99 in the back part. The engagement hole 99a is formed, and the flat part 99b corresponding to the said flat part 3a is formed in a part of the inner peripheral surface.

The entire drive shaft 99 is inserted into the insertion hole 64 of the main body 17 of the joint 4, as shown in FIG. 3, and the through hole 17a and the drive shaft of the joint body 17 are driven. The pin body 99d of 99 is penetrated in the radial direction and is fixed to the joint body 17 by the pin 65 inserted.

Here, a small gap is provided between the drive shaft 99 and the insertion hole 64 and between the pin 65 and the through hole 17a, respectively, so that the spindle 7 slightly rotates in the reverse rotation direction during the rotation operation. Allowing to shift.

The joint 4 is provided with a pair of notches 66 and 66 facing the radial direction, and the rear end 7a of the surface of the spindle 7 is provided on all of the joints 4. The spindle 7 is caught by the joint 4 in a non-rotating manner by being inserted into the notch portion 66 by the elastic fastening member 67, which is a spring material.

The casing 200 of the motor 2 shown in FIG. 3 is comprised by the user cylindrical casing main body 210 opened forward, and the cover 211 which closes the front opening part.

The casing 200 is partitioned back and forth by an intermediate plate 201, and a rotor 202 having a permanent magnet and a stator 203 made of a coil fixed to the casing 200 are stored in the rear chamber, and the front chamber is housed in a front chamber. And a reduction gear mechanism 204 for slowing down the rotation of the rotor 202 and transmitting the rotational force to the output shaft 3 via a transmission path D indicated by a dashed line.

The shaft 206 of the rotor 202 is rotatably supported by the casing body 210 and the cover 211, and the output shaft 3 is a bearing housing fixed to the cover 211 ( It is supported by the bearing 209 accommodated in 208 and the said intermediate | middle plate 201 freely, and protrudes only in the axial direction from the cover 211.

The attachment part 2a is formed in the cover 211, and the motor 2 is fixed to the movable member 50 via the attachment part 2a and the columnar boss 51.

The rotation driving means 12 including the motor 2, the fixing member 40, and the movable member 50 is housed in the case 10 of FIG. 1.

On the inner surface of the case 10, as shown in FIG. 5, a pair of left and right pairs of attachment flanges 86 are provided, and a pair of left and right attachment holes formed in the wiring board support 40a of the fixing member 40 is provided. The fixing member 40, that is, the rotation driving means 12, is fastened to the attachment hole 87 of the attachment flange 86 by the bolt 88 and the nut 89 of FIG. It is supported by the case 10.

A disc-shaped attachment flange 101 is fitted to the outer circumference of the bearing portion 11 of the case 10 and tightened with a nut 105 by a gasket 102 and a washer 103 made of an elastic body such as rubber. have.

The attachment flange 101 is attached to the side wall 63 of the tank T, which is a container in which an object to be measured, such as flour or cement, is stored by the bolt 62.

The spindle 7 is inserted into the insertion hole 91 of the case 10, and is axially supported on the case 10 through the metal bearing 92 and the ball bearing 93, and is moved forward from the case 10. It protrudes and reaches the inside of the container T through the said side wall 63, and the blade | wing 5 is attached to the protruded tip part.

Between the front end of the bearing portion 11 of the case 10 and the spindle 7, two gaskets 94, 95 and an oil chamber 96 are arranged and the push nuts attached to the case 10. It is preserve | saved by (97).

Next, the operation of the rotary level detection device having the above configuration will be described.

First, the motor 2 is attached to the fixing member 40 fixed by the bolt 88 and the nut 89 to the case 10 of FIG. 1, but when the terminal board 79 is not attached, the motor 2 is attached. A hole formed between the wiring board support portions 40a and 40a in FIG. 2, that is, the notch portion 41, is inserted into the hole 99a in which the output shaft 3 is engaged with the drive shaft 99 in FIG. Approach

Thereafter, by manually rotating the drive shaft 99, the positions of the flat portions 3a and 99b of FIG. 9 are matched, and the output shaft 3 is inserted into the engaging hole 99a of the drive shaft 99. By fastening the attaching portions 2a and 2a extending outwardly from both sides of the casing 200 of FIG. 5 to the bosses 51 and 51 corresponding to the screws 55 of FIG. The motor 2 is attached to the movable member 50.

Thus, the output shaft 3 of the motor 2 does not deviate from the engaging hole 99a of the drive shaft 99, and the rotation of the output shaft 3 of the motor 2 is carried out via the drive shaft 99. Can be passed to

In this way, the output shaft 3 protruding largely forward from the casing 200 of the motor 2 in the axial direction is coupled to the drive shaft 99, and the casing 200 is fixed to the movable member 50 with screws 55. Since the motor 2 can be attached simply by using the motor, the bearing 22 and columnar boss of the other side (rear side) shown in FIG. 10 are shown using the motor which has the output shaft 3 of one protrusion type. Parts such as 25 and the attachment piece 26 can be omitted.

As a result, the number of parts can be reduced and a cheap motor device can be provided.

Subsequently, the wiring board 74 with the connector 78 and the terminal board 79 is attached to the support 71 fixed in advance to the wiring board support 40a by the screw 73 of FIG. The connector (not shown) at the tip of the lead wire L1 of the motor 2 is inserted into the connector 78, and the lead wire L3 to the outside is screwed to the terminal board 79 (80). Attach with).

Here, the lead wires L2 from the first and second limit switches 14 and 15 are connected to the wiring board 74 in advance by connecting means such as soldering.

Under such a configuration, the motor 2 of FIG. 1 is driven to rotate in one direction A. FIG.

When the level of the object under test stored in the tank T does not reach the detection level, the vane 5 is rotated by the motor 2 through the spindle 7 without being in contact with the object to be measured, for example. For example, rotate at 1 rpm.

At this time, the motor 2 of FIG. 3 which is driven in a no-load state or close thereto is supported by a bearing 42 with a drive shaft 99, and the movable member 50 fixed to the casing 200 is removed. As indicated by a solid line at 6 degrees, the upper edge 50a is maintained in a horizontal state, and opposite sides 43a of the pair of movable pieces 43 and 44 of the rotation stopping means K of FIG. 44a is in contact with both side surfaces of the stopper 40c, and the pressing operation piece 50b abuts on either side of the stopper 40c, thereby preventing rotation of the movable member 50, that is, the casing 200. As shown in FIG.

At this time, the rollers 14b and 15b of the pair of limit switches 14 and 15 are placed on the flat tops of the convex portions 45a and 45b, as indicated by solid lines in FIG. It is kept in a state.

When the level of the measurement object in the tank T reaches the detection level, the measurement object becomes an obstacle of the rotation of the vanes 5 and acts as a large load on the motor 2.

As a result, the rotation of the output shaft 3 of the motor 2 is lowered, and afterwards, the excessive load is applied to the motor 2, and thus the rotation of the output shaft 3 of the motor 2 is stopped. As a reaction, a rotational force acts on the casing 200, and the movable member 50 is rotated in the B direction as indicated by the dashed-dotted line in FIG. One movable piece 43 is displaced while rotating in the direction B as shown in FIG. 8 against the tensile force of the coil spring 27.

When the pressing operation piece 50b is rotated more than a predetermined angle in the B direction, the rollers 14a and 15b of the limit switches 14 and 15 in FIG. 6 are formed of the convex portions 45a and 45b. Displaced from the flat portion in the bottom hem direction (indicated by the broken line in FIG. 6), the switch operation pieces 14a, 15a of the limit switches 14, 15 are displaced upward, and the limit switch ( By changing both the 14 and 15 states from the on state to the off state, it is detected that the measured object has reached a predetermined level through the external circuit 2.

Here, the limit switch 14 which is turned off at a slightly later timing operates, for example, to turn off the power supply of the motor 2, and the other limit switch 15 outputs a level detection signal to control supply of the object to be measured. Control other circuits not shown, such as circuits.

In the case where the object to be measured is stored in the tank T of FIG. 1 while falling from the upper side, the object to be touched touches the blade 5 during rotation, and a large reverse rotation is made to the spindle 7 through the blade 5. Even when an external force in the direction is added shockingly, the impact force is directly applied to the joint 4 of FIG. 3, that is, a structure is provided to allow a shift in the rotational direction with respect to the drive shaft 99 of the spindle 7. Since it is not transmitted to the rotating shaft 3 of the motor 2, the limit switches 14 and 15 do not operate by mistake by the vibration by the nonuniformity of the rotation of the rotating shaft 3. As shown in FIG.

Moreover, since the output shaft 3 is supported by one bearing 42, the problem that the load of an output shaft increases by the misalignment of the center shaft between the output shaft and two bearings similar to the conventional one which used two bearings also will be eliminated.

Next, in the replacement of the motor 2, the cap 32 is loosened, and only the lead wire L1 of the motor 2 is released from the connector 78 as soon as the external lead wire L3 is attached to the terminal board 79. After removing the 74 from the fixing member 40 and moving it backward, the fixing screw 55 is loosened from the movable member 50.

In this state, since the motor 2 is inserted into the notch portion 41 of the fixing member 40, the fixing member 40 is not obstructed and the motor 2 can be taken out of the case 10. .

In other words, it is possible to easily replace only the motor 2.

Here, the rotation stopping means (K) is supported by the fixing member 40, a pair of movable pieces sandwiching the pressing operation piece (50b) of the movable plate 50 in the front and rear of the rotation direction of the motor (2). Since the 43 and 44 and the springs 27 hanging on them are provided, the structure of the rotation stopping means K is simplified, and the fixing member 40 no matter which direction the output shaft 3 rotates. An elastic force can be added in a direction for preventing relative rotation of the casing 200 with respect to).

Moreover, even if the movable plate 50 shown in FIG. 7 also rotates in any direction, the 1st and 2nd limit switches 14 and 15 contact with the rollers 14b and 15b, and Off.

Therefore, the rotation direction regulating means for rotating the output shaft 3 of the motor 2 only in one direction becomes unnecessary, so that the structure of the motor 2 is simplified.

The limit switches 14 and 15 have rollers 14a and 15a at ends of the switch operation pieces 14a and 15a, and the fixing member 40 and the movable plate 50 are provided. The limit switches 14 and 15 are supported on one side of the cam surface, and the cam surfaces 45a and 45b on the other side of the cam surface 45a and 45b for contacting the rollers 14b and 15b are provided. By changing the size, the timing of switching can be delayed.

Therefore, for example, various control is possible by providing a plurality of limit switches 14 and 15 as in the embodiment to change the timing of switching between each other.

Claims (6)

It is disposed between the fixing member 40, the fixing member 40 and the motor 2, provided with a bearing 42 for supporting the drive shaft 99 to which the output shaft 3 of the motor 2 is coupled, The movable member 50 is rotatably attached to the fixing member 40 concentrically with the output shaft 3 and to which the casing 200 of the motor 2 is fixed, and to the fixing member 40. A rotation stopping means (K) for adding an elastic force to the casing (200) in a direction of preventing relative rotation of the casing (200), and a casing (200) of the motor (2) against the elastic force of the rotation blocking means (K). And a switching means (14) and (15) for detecting when the motor rotates more than a predetermined angle. 2. The motor device according to claim 1, wherein the output shaft (3) of the motor (2) protrudes only in one axial direction from the casing (200) of the motor (2). The rotating rotation means (K) according to claim 1 or 2, wherein the rotation stopping means (K) is supported by the fixing member (40) and the pressing operation piece (50b) formed on the movable member (50) in the rotational direction of the motor (2). A motor device comprising a pair of movable pieces (43) and (44) sandwiched between before and after of the spring (27). 2. The fixing member 40 has terminal mounting portions 40a and 40b positioned axially rearward of the motor 2, and these terminal mounting portions 40a and 40b are provided. The motor apparatus which has the notch part 41 in which the said motor 2 is inserted. 2. The switch unit (14) according to claim 1, wherein the switch means (14) and (15) are provided as limit switches (14) and (15) having rollers (14b) and (15b) at ends of the switch operation pieces (14a) and (15a). The limit switch 14, 15 is supported on one side of the fixing member 40 and the movable member 50, and the switch is in contact with the rollers 14b, 15b on the other side. A motor device provided with cam faces 45a and 45b to be provided. 2. The rotary drive means (12) according to claim 1, comprising the motor (2), the stationary member (40) and the movable member (50), and is connected to the output shaft (3) of the motor (2). A case 10 supporting the spindle 7 and a flange 10a installed in the case 10 and attached to the wall 63 of the container T in which the object to be measured is stored. The spindle (7) protrudes outward from the case (10), penetrates through the wall (63), enters the interior of the container (T), and has a blade (5) attached to the protruding tip thereof.