WO2000021651A1

WO2000021651A1 - An agitator

Info

Publication number: WO2000021651A1
Application number: PCT/JP1998/004626
Authority: WO
Inventors: Masanori Shimizu
Original assignee: Takeuchi Manufacturing Co., Ltd.
Priority date: 1998-10-13
Filing date: 1998-10-13
Publication date: 2000-04-20
Also published as: TW425303B; AU9460998A

Abstract

Two radial bearings rotatably supporting the upper part of a shaft having agitating impellers on the body of an agitator are disposed separately around the portions of the shaft above and below a reduction gear fitted to the upper part of the shaft to sandwich the reduction gear. The two radial bearings are accommodated and supported inside the housings above and below the reduction gear. The number of shaft supporting radial bearings to be accommodated and supported inside the housing part extending in the direction of the shaft at the lower part of the agitator body is halved to one, and the length of the housing part for accommodating and supporting the radial bearing, extending in the direction of the shaft at the lower part of the agitator body is thereby shortened.

Description

Description Stirrer Technical field

The present invention relates to a stirrer for stirring various liquid, powdery or granular objects, and more particularly to an improvement in a support mechanism for supporting a shaft having stirring blades on a stirrer main body. Background art

In this type of stirrer, generally, as shown in Fig. 4, two rollers in which the upper part of a shaft 20 provided with a stirring blade 10 at the lower end is arranged at a predetermined interval are radial bearings of a re-bearing. It is rotatably supported in a cantilever state on the main body 70 of the stirrer via 32 and 34.

The two radial bearings 32, 34 that rotatably support the upper part of this shaft 20 in the stirrer main body 70 in a cantilever state fit into the upper part of the shaft 20, as shown in FIG. The large-diameter reduction gears 40 are arranged below and above each other.

The reduction gear 40 is combined with a small gear 60 fitted on an output shaft (not shown) of the electric motor 50. Then, by driving the electric motor 50, the large-diameter reduction gear 40 fitted to the small gear 60 fitted to the output shaft of the electric motor 50 is rotated, and together with the reduction gear 40, The shaft 20 can be rotated slowly.

The reduction gear 40, the small gear 60, and the pair of radial bearings 32, 34 are housed and supported in the housing 72 of the stirrer main body 70 in an airtight state. The two radial bearings 32, 34, which rotatably support the upper part of the shaft 20 on the stirrer body 70, are provided with a housing 7, which extends in the direction of the shaft 20 at the lower part of the stirrer body 70 and extends in a cylindrical shape. Both are housed and supported inside the two parts.

From the lower part of the housing 72 that accommodates and supports the two radial bearings 32, 34, the tip of the shaft 20 provided with the stirring blades 10 protrudes long below the stirrer body 70. I have.

For this reason, in this conventional stirrer, the housing 72, which extends long in the direction of the shaft 20 in the lower part of the stirrer 70, accommodates two radial bearings 32, 34. The supported housing 72 is in the way, and the stirrer main body 70 is attached to the support rod 110, which extends over the opening at the upper end of the stirrer tank, using the clamp 100 attached to the stirrer main body 70. At the time of attachment, the work of attaching the stirrer body 70 was hindered.

In order to solve such difficulties, it is considered that the length of the housing 72 that accommodates and supports the two radial bearings 32 and 34 may be reduced.

However, in such a case, the distance between the two radial bearings 32, 34 housed and supported inside the housing 72 part was reduced. Then, the support state of the upper part of the shaft 20 supported in a cantilever manner on the stirrer main body 70 via the two radial bearings 32 and 34 became unstable. At the same time, if the long shaft 20 swings back and forth, etc., the two radial bearings 32, 34 that support the upper part of the shaft 20 on the stirrer body 70 will cause excessive load from the shaft 20. Due to the load, the life of the two radial bearings 32, 34 was shortened.

The present invention is a stirrer that solves such a problem, and includes a stirring blade. It is a first object of the present invention to provide a stirrer that accommodates a radial bearing that rotatably supports a shaft that is cantilevered on a stirrer body in a cantilevered state, and that does not need to extend a housing portion below the supported stirrer body in the shaft direction. It is.

In addition, stirring can prevent the radial bearing, which rotatably supports the shaft with stirring blades on the stirrer body in a cantilevered state, from applying an excessive load from the shaft to shorten the life of the radial bearing. The second purpose is to provide a machine. Disclosure of the invention

In order to achieve the above object, a stirrer according to the present invention is characterized in that a large-diameter reduction gear fitted to an upper portion of a shaft having a stirring blade is connected to a small gear fitted to an output shaft of an electric motor. The upper part of the shaft is rotatably supported on the stirrer main body via two rolling bearing radial bearings, and the reduction gear, the small gear, and the two radial bearings are inside the housing of the stirrer main body. In the stirrer, which is stored and supported by

Two radial bearings that rotatably support the upper part of the shaft on the stirrer main body are separated and arranged around the shaft above and below the reduction gear with the above-mentioned reduction gear interposed therebetween. Then, the two radial bearings are housed and supported inside the housing.

In this stirrer, two radial bearings, which rotatably support the upper part of a shaft having stirring blades at the lower part of the stirrer body, are not arranged side by side below the reduction gear. One radial bearing of the bearing is located above the reduction gear.

Therefore, one radial bearing placed above the reduction gear Can be housed and supported inside the housing above the reduction gear. One radial bearing of the two radial bearings that rotatably supports the upper portion of the shaft on the main body of the stirrer can be removed from the inside of the housing portion extending in the shaft direction below the main body of the stirrer. Then, the number of radial bearings housed and supported inside the housing portion extending in the shaft direction at the lower portion of the stirrer body can be reduced to half.

As a result, the length of the housing part that accommodates and supports the single radial bearing and that extends in the shaft direction at the bottom of the stirrer body is reduced by more than half compared to the conventional one. it can.

In addition, two radial bearings that rotatably support the upper part of the shaft on the stirrer main body are sandwiched between the reduction gears, with a large gap above and below the reduction gear with a thickness greater than the thickness of the reduction gear, They can be separated and arranged side by side.

As a result, even if the long shaft swings back and forth, an excessive load is applied from the shaft to the two radial bearings that rotatably support the upper part of the shaft in a cantilevered state on the main body of the stirrer. The life of the two radial bearings can be prevented from being shortened.

In the stirrer of the present invention, the outer ring of one of the radial bearings disposed around the shaft above the reduction gear is accommodated in an upper cutout having a lower end provided inside the housing, and the outer side of the outer ring of the one radial bearing is accommodated. An end surface is brought into contact with and engaged with the upper end surface of the upper notch via an elastic body, and the inner end surface of the inner race of one of the radial bearings is brought into contact with and engaged with the upper end side surface of the reduction gear, and the speed is reduced. The outer ring of the other radial bearing disposed around the shaft below the gear is housed in the lower notch with the upper end opened inside the housing, and the outer end face of the outer ring of the other radial bearing is cut with the lower notch. Abuts and locks the lower end surface of the The inner ring of the other radial bearing is clamped between the snap ring fitted around the shaft and the jaw protruding around the shaft, and the upper part of the shaft is passed through one and the other two radial bearings. It is preferable to adopt a structure in which the housing of the stirrer body is rotatably supported so as not to move in the axial direction of the shaft.

Here, it is preferable to use a wave washer for the elastic body.

In this stirrer, the outer end surface of the outer ring of one of the radial radial bearings disposed around the shaft above the reduction gear is cut through an elastic body through an upper cutout inside the housing containing the one radial bearing. It is in contact with the upper end surface and locked.

Therefore, when assembling the stirrer, for example, an error in the axial direction of the shaft occurs at the position of the two radial bearings disposed above and below the reduction gear and around the shaft, or during operation of the stirrer. If the two radial bearings placed above and below the reduction gear vibrate up and down, the amount of error in the position of the two radial bearings and the amount of vertical vibration Following this, the elastic body interposed between the outer end surface of the outer race of one radial radial bearing and the upper end surface of the upper cutout inside the housing can be elastically deformed thinly or thickly. An excessive force is applied to the two radial bearings placed above and below the reduction gear from the shaft, reduction gear, housing, etc. The life of the radial bearing can be prevented from being shortened.

Also, during operation of the stirrer, two radial bearings arranged above and below the reduction gear vibrate up and down and collide with the shaft, reduction gear, housing, etc. that support it. Noise, and large noise is generated by the shaft, reduction gear, housing, etc. that support it. The impact force can be prevented by the elastic body interposed between the outer end surface of the outer ring of one of the radial bearings and the upper end surface of the upper cutout inside the housing. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a structural explanatory view showing a preferred embodiment of a stirrer of the present invention.

FIG. 2 is an enlarged structural explanatory view of the periphery of the shaft of the stirrer of the present invention, FIG. 3 is an enlarged perspective view of a wave washer used in the stirrer of the present invention, and FIG. 4 is a structural description of a conventional stirrer. FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Next, a preferred embodiment of the stirrer of the present invention will be described with reference to FIGS. 1 to 3.

In the figure, reference numeral 20 denotes a shaft provided with a stirring blade 10 at a lower portion. As shown in FIG. 1, the shaft 20 is composed of a long round bar 22 and a connecting bar 24 to which the upper end of the round bar 22 is detachably connected. The round bar 22 provided with various stirring blades 10 can be exchangeably connected to the lower end of the connecting bar 24. The upper end of the round bar 22 is inserted into the blind hole 26 opened at the lower end surface of the connecting rod 24, and is inserted into the blind hole 26 by the set screw 28 provided on the peripheral wall of the connecting rod 24. So that it can be detachably fixed to it. A large-diameter reduction gear 40 is fitted around the upper part of the connecting rod 24 constituting the upper part of the shaft 20 so as to be rotatable together with the connecting rod 24. The reduction gear 40 is combined with a small gear 60 fitted on the output shaft 52 of the electric motor 50. Then, by driving the electric motor 50, the large-diameter reduction gear 40 coupled to the small gear 60 fitted to the output shaft 52 of the electric motor 50 is rotated to reduce the reduction gear. Round bar 2 at the lower end of connecting rod 2 4 with 4 0 Shaft 20 connecting 2 can be rotated slowly.

A helical gear is used for the reduction gear 40 and the small gear 60 combined therewith. Then, the rotational force of the output shaft 52 of the electric motor 50 is transmitted to the shaft 20 almost uniformly with little torque fluctuation via the small gear 60 and the reduction gear 40 composed of a helical gear. I have to. At the same time, it is possible to reduce noise when the reduction gear 40 and the small gear 60 are combined while rotating.

The connecting rod 24 constituting the upper part of the shaft 20 is a radial bearing of two rolling bearings (the figure shows a radial ball bearing)

It is rotatably supported on the stirrer main body 50 via 32 and 34.

The reduction gear 40, the small gear 60, and the two radial bearings 32, 34 are housed and supported in a nearly airtight state inside the housing 72 of the agitator body 70. The oil, metal powder, and dust scattered or generated from the reduction gear 40, the small gear 60, and the two radial bearings 32, 34 are stirred under the agitator body 70. It prevents mixing into the stirred objects contained in a tank (not shown).

The electric motor 50 is disposed above the housing 72, and the lower end thereof is screwed to an outer wall of the housing 72.

The above configuration is the same as that of the conventional stirrer shown in FIG. 4, but in the stirrer shown in FIG. 4, the periphery of the connecting rod 24 above and below the reduction gear 40 is sandwiched by the reduction gear 40. In addition, two radial bearings 32, 34 for rotatably supporting the upper portion of the shaft 20 on the stirrer main body 70 are arranged side by side separately. The two radial bearings 32, 34 for supporting the connecting rod 24, which forms the upper part of the shaft 20, on the stirrer body 70, are located above the reduction gear 40 and inside the housing 7 2, below it. Contained and supported. Then, one radial bearing 32 of the two radial bearings 32, 34 for rotatably supporting the connecting rod 24 constituting the upper part of the shaft 20 on the stirrer main body 70 is connected to the stirrer main body 70. The housing 72 extending in the lower shaft 20 direction is removed from the inside of the two portions. Then, the number of radial bearings housed and supported inside the housing 72 extending in the shaft 20 direction below the stirrer main body 70 is reduced by half. The length of the housing 72 extending in the direction of the shaft 20 below the stirrer main body 70 is reduced to more than half the length of the conventional housing 72 shown in FIG.

In addition, two radial bearings 32, 34 for rotatably supporting the connecting rod 24, which forms the upper part of the shaft 20, on the stirrer body 70, are provided with a reduction gear 4, The reduction gears 40 are separated and arranged above and below 0 at a large interval larger than the thickness of the reduction gear 40. An excessive load is applied from the shaft 20 to the two radial bearings 32, 34, which rotatably support the upper part of the shaft 20 in a cantilever manner on the stirrer main body 70, and the two bearings are rotated. Radial bearings 3 2 and 3 4 are prevented from shortening their service life.

The outer ring 3 2 2 of the radial bearing 3 2 arranged around the connecting rod 2 4 above the reduction gear 4 0 is connected to the upper notch 7 4 with the lower end opened in a ring shape inside the housing 7 2 and the lower end thereof. It is housed through the opening. The outer end surface of the outer race 3 22 of one of the radial bearings is in contact with and engaged with the upper end surface of the upper notch 74 via an elastic body 80.

At the same time, the inner end surface of the inner race 324 of one of the radial bearings is brought into contact with and engaged with the upper end side surface of the reduction gear 40 fitted around the shaft 20.

Reduction gear 40 Lower connecting rod 24 Other radial bearing arranged around 4 The outer ring 342 of the ring 34 is housed in a lower notch 76 provided in a ring shape inside the housing 72 and having an open upper end, through an upper end opening. The outer end surface of the outer ring 342 of the other radial bearing is directly in contact with and engaged with the lower end surface of the lower notch 76.

At the same time, the inner ring 344 of the other radial bearing 34 is sandwiched between a snap ring 90 fitted around the shaft 20 and a jaw 27 protruding around the shaft 20. are doing.

The connecting rod 24 constituting the upper part of the shaft 20 is rotatably supported on the housing 72 of the stirrer main body via the two radial bearings 32 and 34 on the other side. ing.

At the same time, the shaft 20 is supported by the housing 72 of the stirrer main body so as not to move in the axial direction of the shaft 20 via the two radial bearings 32 and 34 on the other side.

As the elastic body 80, a wave washer as shown in FIG. 3 is used.

The wave washer is formed of a thin annular spring band, and the annular spring band is wavy in the circumferential direction. If this wave washer is sandwiched between a pair of upper and lower objects and the distance between the pair of upper and lower objects is changed to be shorter or longer, the wave washer sandwiched between the upper and lower pair of objects is adjusted accordingly. It can be elastically deformed thick or thin in the direction.

Note that an elastic rubber ring, a compression coil spring, or the like can be used for the elastic body 80.

When assembling the stirrer or the like, an error in the axial direction of the shaft 20 occurs at the position of the two radial bearings 32, 34 arranged around the shaft 20 above and below the reduction gear 40. Occurs, or when the two radial bearings 32 and 34 arranged above and below the reduction gear 40 and around the shaft 20 during operation of the stirrer vibrate up and down. According to the amount of error in the arrangement position of the two radial bearings 3 2 and 3 4 and the amount of vibration in the upward and downward directions, the outer end face of the outer ring 3 22 of one of the radial radial bearings and the upper notch inside the housing 7 2 The elastic body 80 interposed between the upper end surface of the elastic member 74 and the upper end surface of the elastic member 74 can be elastically deformed to be thin or thick vertically. The two radial bearings 32, 34 arranged above and below the reduction gear 40 and the shaft 20 below the shaft 20 support the shaft 20, the reduction gear 40, and the housing 72, respectively. Excessive force is applied to prevent the life of the two radial bearings 32, 34 from being shortened.

Also, during operation of the stirrer, for example, two radial bearings 32, 34 arranged above the reduction gear 40 and around the shaft 20 below the reduction gear 40 vibrated up and down to support it. It collides with the shaft 20, the reduction gear 40, the housing 72, etc. to generate noise, and receives a large impact force from the shaft 20, the reduction gear 40, the housing 72, etc. that support it. This can be prevented by the elastic body 80.

In addition, in the stirrer shown in the figure, a clamp 100 is provided on the outer wall side of the housing 72. The clamp 100 is provided with an inverted U-shaped gripper 102 facing downward. Then, as shown by a two-dot chain line in FIG. 1, a support rod 110 bridged over the opening at the upper end of the stirring tank can be held inside the holding portion 102.

The stirrer shown in FIGS. 1 to 3 is configured as described above. For reference, an example of use of this stirrer will be described.

As shown by the two-dot chain line in FIG. 1, a support rod spanning the upper end opening of the stirring tank inside the gripper 102 of the clamp 100 attached to the outer wall of the housing 72. Hold 110. Then, the stirrer main body 70 is raised and fixed to the opening at the upper end of the stirring tank. Connected to the lower end of connecting rod 24 The round bar 22 provided with the stirring blade 10 is suspended in the back of the stirring tank.

Next, the electric motor 50 is driven to rotate the small gear 60 fitted to the output shaft 52 of the electric motor.

Then, the large-diameter reduction gear 40 combined with the small gear 60 rotated slowly, and was accordingly supported by the stirrer main body 70 via two radial bearings 32, 34. The connecting rod 24 rotates slowly. Then, the round bar 22 connected to the lower end of the connecting bar 24 rotates together with the stirring blade 10 provided at the lower end of the round bar 22. The rotating stirring blade 10 stirs the liquid, powdery, or granular object in the stirring tank.

According to the present invention, a support bar (not shown) is provided on the outer wall of the lower part of the housing 72, and a stirrer main body 70 is stretched over the opening at the upper end of the stirring tank through the base. It can also be used for a stirrer with a structure to be mounted on Even if the present invention is used in such a stirrer, a housing 72 for accommodating and supporting a radial bearing for supporting a shaft 20 extending in a direction of a shaft 20 at a lower portion of the stirrer main body 70 is provided. The length of the portion can be kept short, and the stirrer main body 70 can be mounted on the compact with little hindrance to the support rod 110 that extends over the opening at the upper end of the stirring tank. Industrial applicability

ADVANTAGE OF THE INVENTION According to the stirrer of this invention, the radial bearing which rotatably supports the upper part of the shaft provided with the stirring blade in the stirrer main body in the cantilever state is accommodated, and the housing part which supported is elongated in the shaft direction of the lower part of the stirrer main body. Without extending, the length of the housing that accommodates and supports the radial bearing can be greatly reduced. Then, when the stirrer main body is attached to a support rod or the like spanned over the opening at the upper end of the stirrer tank, the stirrer extends in the shaft direction below the stirrer main body. It is possible to prevent the installed radial bearing for supporting the shaft from being housed and hindering the housing portion from hindering the mounting work of the stirrer body.

In addition, two radial bearings that rotatably support the upper part of the shaft on the stirrer body in a cantilevered state can be arranged separately above and below the reduction gear with the reduction gear therebetween. In addition, the distance between the two radial bearings that support the upper part of the shaft on the main body of the stirrer can be greatly increased. And, even if the long shaft swings back and forth, it is possible to prevent the two radial bearings from being subjected to an excessive load from the shaft and shortening the life of the two radial bearings. .

Claims

The scope of the claims

1. A large-diameter reduction gear fitted to the upper part of the shaft provided with the stirring blade is combined with a small gear fitted to the output shaft of the electric motor, and the upper part of the shaft is a roller bearing. In the stirrer rotatably supported by the stirrer main body via the radial bearing of the above, the reduction gear, the small gear, and the two radial bearings are housed and supported inside the housing of the stirrer main body.

Two radial bearings that rotatably support the upper part of the shaft on the stirrer main body are arranged side by side separately around the shaft above and below the reduction gear with the reduction gear interposed therebetween. A stirrer characterized in that the two radial bearings are accommodated and supported inside the housing.

2. The outer ring of one radial bearing placed around the shaft above the reduction gear is housed in the upper cutout with the lower end opened inside the housing, and the outer end surface of the outer ring of one radial bearing is placed in the upper part. The upper end surface of the notch is brought into contact with and locked via an elastic body, and the inner end surface of the inner race of one of the radial bearings is brought into contact with and locked to the upper end side surface of the reduction gear, and the lower shaft of the reduction gear is The outer ring of the other radial bearing placed around the shaft is housed in a lower notch with an open upper end provided inside the housing, and the outer end surface of the outer ring of the other radial bearing is fitted with the lower end surface of the lower notch. Abuts and locks, between the snap ring where the inner ring of the other radial bearing is fitted around the shaft and the jaw protruding around the shaft The upper part of the shaft is rotatably supported by the housing of the main body of the stirrer via the two radial bearings of one side and the other so as not to move in the axial direction of the shaft. Claims Item.