JPS5829126B2 - Impeller drive for agitator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an impeller drive device for a stirring tank, particularly a stirrer for highly viscous liquid, and the object of the present invention is to
Among this type of stirrers, it is an object of the present invention to provide an invention which is particularly intended to improve the stirring movement of the impeller.

An embodiment of the present invention will be described below with reference to the drawings.

In the drawings, reference numeral 1 denotes a stirring tank that is removably supported by supporting legs f, etc., and has a seed opening rim 1a that is opened on the upper surface of the same type 1.
A machine base plate 2 having a central opening 2a is mounted on the machine.

Reference numeral 3 denotes a cylindrical frame body, which is mounted on the upper surface of the machine base plate 2 via a bearing support plate 4.

Reference numeral 5 denotes a motor that is vertically installed on the upper surface of the frame 3 through a gear chamber 6, and a first gear 7a is keyed to the motor shaft 5a.

Reference numeral 8 denotes a worm shaft rotatably mounted on ball bearings 9a and 9b at the upper and lower parts of the frame 3, and a worm 10 is keyed 10a near the upper part of the worm shaft 8.
At the upper end is a second gear 7b that meshes with the first gear 7a.
A third gear 17a, which will be described later, is also keyed to the lower end of the coaxial shaft 8.

Reference numeral 11 denotes a worm wheel that meshes with the worm 10, and ball bearings 12a, 12 are connected to the substantially upper part of the frame 3.
The key 1 is mounted on one end of the crankshaft 13 which is rotatably mounted on the
1a has arrived.

The upper end 14a of the connecting rod 14 is reversibly suspended from the crank pin 13a of the crankshaft 13.

15 is a pin 15 attached to the lower end 14b of the connecting rod 14.
The upper end 16a of the interlocking shaft 16 is
are interlocked by a ball bearing 15b so that they can rotate and move up and down.

The interlocking shaft 16 described above is supported in a shaft cylinder 18 of a fourth gear 17b (described later) via a ball group 19 so as to be vertically movable.

In addition, the shaft cylinder 18 is attached to the ball bearing 4 with respect to the ball bearing support plate 4.
It is removably mounted via a.

Note that the fourth gear 17b is meshed with the third gear 17a.

20 is a coupling 16c attached to the lower end 16b of the interlocking shaft 16.
A group of impellers 21, which are connected to each other by an axle, and which is rotated within the stirring tank 1, are keyed so as to be horizontally rotatable.

In addition, in this example, the impeller group 21 includes impellers 21a to 21c provided in three stages, upper, middle, and lower.

Continuing, the operation and effects of the embodiment configured as described above will be specifically explained.

Now, in this example device, the motor 5 drives the first gear 7a and the second gear.
When the crankshaft 13 is rotated via the gear 7b, the worm 10, and the worm wheel 11, the connecting rod 14,
The impeller group 21 is moved up and down in the stirring tank 1 via the interlocking shaft 16 and the impeller axle 20. At this time, the interlocking shaft 16 is connected to the third gear 17a and the fourth gear 17 by the worm shaft 8.
b, the blade wheel group 21 is rotated while being moved up and down, so that a desired stirring operation is performed, and a point P on the outer periphery of the blade wheel group 21 performs a spiral movement in which the lead is constantly changing. , the stirring effect can be improved and high viscosity liquids can be stirred.

Next, the motion of the one point P will be dynamically analyzed to specifically explain the features of the present invention in detail.

Now, in FIG. 3, r - Radius l of crank pin 13a = Length of connecting rod 14 n - Rotation ratio between rotation speed Nl of crankshaft 13 and rotation speed N2 of interlocking shaft 16 (N2/Nl) θ = Crank Rotation angle θ' of the shaft 13 = rotation angle (nθ) of the interlocking shaft 16 S = vertical movement amount of the joint point P between the connecting rod 14 and the interlocking shaft 16 (corresponds to the movement amount of the blade wheel group 21) Then, S is expressed by the following equation.

becomes.

The relationship between the locus of the point P and the rotation ratio n will be explained with reference to FIG. 4.

First, the rotation ratio n n == n'+△n' Among the above n'-integer Let Δn' be a decimal number of 1 or less.

However, for ease of understanding (n'=5,
Δn' = 0.2).

Then, △n' becomes the overlap amount of each trajectory, so a cage-like trajectory is obtained as shown in the figure, and the blade wheel group 2
The advantage of this method is that the stirring range of No. 1 is extremely dense.

That is, by interposing a worm mechanism in the drive system of the crankshaft, the present invention not only significantly reduces noise during operation of the device of the present invention, even though the crank mechanism is based on reciprocating motion. Another great feature is that by selecting the value of the rotation ratio n, the stirring range of the impeller can be made finer and more precise.

In particular, since the crankshaft 13 is driven via a worm mechanism, there is a great advantage that the impeller does not naturally fall while it is stopped rising.

In the above description, the radius and rotational ratio n of the crank arm of the crankshaft 13, the number of stages of the impeller group 21, etc. are preferably selected to take into account the viscosity of the material to be stirred.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional view of the device of the present invention, FIG. 2 is a schematic plan sectional view showing the relationship between the crankshaft and the worm mechanism, and FIG. 3 is a blade wheel. FIG. 4 is a diagram showing an expanded trajectory of the outer end of the impeller. 1... Stirring tank, 3... Machine base plate, 4...
...Bearing support plate, 5...Motor, 7a...
...1st gear, 7b...2nd gear, 8...
... Worm axis, 10 ... Worm, 11
... Worm wheel, 13 ... Crankshaft, 13a ... Crank pin, 14 ...
...Connecting rod, 16... Interlocking shaft, 17a.
...3rd gear, 17b...4th gear, 2
0...Blade wheel axle, 21...Blade wheel group.

Claims (1)

[Scope of Claims] 1. A worm shaft rotated from a drive source, a worm wheel meshed with the worm of the worm shaft and connected to one end of the crank shaft, and a mount rotatable with respect to the crank pin of the crank shaft. The joined rond, a rotatable interlocking shaft that is pinned to the lower end of the rond so that it can move up and down, a blade axle provided at the lower end of the interlocking shaft, and a blade axle that rotates and rotates with the blade axle relative to the inside of the stirring tank. 1. A blade wheel drive device for an agitator, comprising one blade wheel that moves up and down, the interlocking shaft being rotated at a predetermined rotation ratio relative to the worm shaft. 2. The impeller drive device for an agitator according to claim 1, wherein the impeller is provided in multiple stages relative to the impeller axle.