JPS6014481Y2 - Lifting actuator in rotary evaporator - Google Patents

Description

[Detailed description of the invention] The present invention includes an elevating body that rotatably supports a sample container on a vertically erected post, and a lifting body that supports the sample container in a rotatable manner so that it can be raised and lowered, and a screw for lifting and lowering that is installed parallel to the said pillar. This invention relates to an elevating and lowering operating device for a rotary evaporator, in which the elevating body is screwed onto a punch, and the elevating body is moved up and down along a column by rotation of the screw pestle.

In this type of elevating device, the base of the elevating body is fitted into the support column so as to be able to rise and fall freely, and a heavy object such as a sample container or its rotation drive device is attached to the tip of the elevating body. In this case, since the elevating body is supported in a cantilever manner with respect to the column, an uneven load acts on the screw for elevating and lowering, causing it to curve slightly.

Therefore, the threaded state of the screw for lifting/lowering operation with the lifting body may be inconvenient, resulting in chattering noise and the lifting body not being able to move up and down smoothly.

The present invention was created in view of the above-mentioned problems, and it is designed to have a slight play between the nut member screwed into the screw for lifting and lowering and the lifting body, and to provide an elastic force between the nut member and the lifting body. When the screw for raising/lowering operation is bent due to the interposition of a machine, the bending is absorbed and the threaded state between the screw and the nut member is always maintained in a good condition.

Hereinafter, one embodiment of the present invention will be described in detail using the drawings.

Note that the present invention can be applied to various other devices if necessary.

FIG. 1 is a front view of the rotary evaporator, and FIG. 2 is a side view thereof.

Briefly, the rotary evaporator according to this embodiment is provided with an elevating body 5 supported on a support 3 (see Fig. 3) erected on a base 1 so as to be movable up and down. A sample container 11 such as an eggplant-shaped flask is attached to one end of the hollow rotating shaft 9 (see FIG. 4) at the rotational drive amount 7.
The condenser 1 is detachably attached to the other end of the rotating shaft 9.
3 is removably attached thereto, and is also equipped with a water bath 15 for heating the sample container 11.

Next, details of each part will be explained.
Since the condenser 13 has the same configuration as a general one, detailed explanation thereof will be omitted.

Although a detailed illustration of the water bath 15 is omitted, the water bath 15 is equipped with a heater that heats water and a temperature sensor that detects the water temperature, and the ON/OFF of the heater is controlled by a microcomputer or the like. It is controlled by the device, and the water bath 15
The water temperature inside is always maintained at the set temperature.

The elevating body 5 is attached to the pillar 3 erected on the base 1.
A guide hole 5G formed on the base side of the lift body 5 is fitted therein so as to be vertically movable, and the lift actuating device 7 is supported on the tip side of the lift body 5.

This rotary drive device 7 is rotatably supported by a horizontal shaft 17 that is fitted and fixed into a mounting hole 5T horizontally drilled in the elevating body 5.

That is, by loosening the lever 19 provided on the rotary drive device 7, the rotary drive device 7 can be rotated (tilted) about the horizontal axis 17, and by tightening the lever 19, the rotary drive device 7 can be rotated as described above. It can be fixed integrally to the horizontal shaft 17.

Therefore, by appropriately rotating and fixing the rotation drive device 7, the inclination angle of the sample container 11, etc. can be adjusted.

A vertical fitting hole 5 is provided near the center of the elevating body 5.
F is bored, and this fitting hole 5F has a flange 21F.
The nut member 21 with the screw is loosely fitted.

That is, the fitting hole 5F is a recessed hole (generally called a hole) for the nut member 21.

A bullet 25 such as a coil spring is loaded between the heads of a plurality of bolts 23 that loosely pass through the flange 21F of the nut member 21 and are integrally screwed onto the elevating body 5 and the flange 21F. be.

In this embodiment, the nut member 21 is fitted into the fitting hole 5F from below, but it may also be fitted from above.

The nut member 21 is screwed into a lifting screw 27 provided parallel to the support 3.

The upper end of the lifting screw 27 is rotatably supported via a shaft support 31 on a bracket 29 fixed to the upper end of the column 3 with a plurality of bolts, and the lower end is
It is rotatably supported by a sub-base 35 supported by the base 1 via a plurality of shock absorbers 33 such as elastic rubber.

Therefore, the lower end of the lifting screw 27 can be slightly displaced in the horizontal direction.

A worm gear 37 is integrally fixed near the lower end of the lifting screw 27, and the worm gear 37 is integrally connected to an output shaft 41 of a motor 39 for forward and reverse rotation mounted on the sub-base 35. It always meshes with the worm 43 provided in the center.

Therefore, by appropriately rotating the motor 39, the lifting screw 27 is rotated forward or backward, and the lifting body 5 is moved up and down along the column 3.

At this time, since the rotary drive device 7 is attached to the tip end side of the elevating body 5, the screw punch 27 for elevating and lowering is mainly rotated slightly toward the left in the vicinity of the upper and lower center in FIG. Although it tends to be curved so as to protrude, the sub-base 35 supporting the lower end of the lifting screw 27 is slightly displaced to the left in FIG. The slight relative displacement caused by the loose fit prevents the lifting screw 27 from bending.

That is, although the lower end of the lifting screw 27 is tilted slightly to the left in FIG. 3, since the nut member 21 and the lifting body 5 are loosely fitted, The nut member 21 is slightly inclined with respect to the elevating body 5, and there is no problem in the threaded engagement between the nut member 21 and the elevating screw 27.

Therefore, the vertical movement of the vertical movement of the vertical movement body 5 is performed smoothly by the rotation of the vertical movement screw 27, and there is no possibility of chattering noise.

As mentioned above, when the elevating body 5 is moved up and down along the column 3 by the rotation of the motor 39, the upper and lower limits are as follows.
It is arbitrarily set by an upper limit setting device 45 and a lower limit setting device 47 which are mounted on the upper end side and the lower end side of the column 3 so as to be able to freely adjust their positions.

The upper limit setting device 45 and the lower limit setting device 47 are fixed to the support column 3 with fixing devices 49a, 49b such as bolts, and are each equipped with a detection device 51, 53 such as a limit switch.

Therefore, when each of the detection devices 51, 53 is activated due to the rise or fall of the elevating body 5, the
By stopping the rotation, upper and lower limits can be set for the elevating body 5.

Therefore, the position of the sample container 11 with respect to the water bath 15 can always be kept constant, and it is also possible to prevent the waste of raising the elevating body 6 more than necessary.

Note that the motor 39 can be stopped when the load on the motor 39 changes due to the lifting body 5 coming into contact with the upper limit setting device 45 or the lower limit setting device 47. , this motor 3
It is also possible to stop the motor 39 by detecting the load fluctuation of 9.

The motor 39 and the like are housed inside the casing 55, and the support column 3 and the like are housed inside the cover 57.

The rotary drive device 7 has a structure as shown in FIG.

That is, an annular cap 61 is fixed to one end of a stator frame 59 shaped like a cylindrical housing in the rotary drive device 7, and a stator core 63 is fixed within the stator frame 59.

Rotor core 65 located in the center of the stator core 63
is fixedly supported by the hollow rotating shaft 9, and both ends of the rotating shaft 9 are connected to the stator frame 59 and the cap 61.
is rotatably supported via a bearing 67.

A slit disk 69 is integrally attached to the rotating shaft 9.

This slit disk 69 is provided very close to the rotor core 65, and has an extremely large number of small holes or slits (not shown) equidistantly spaced along its outer periphery. is a gap 71S between the photosensors 71 mounted on the stator frame 59 close to the stator core 63.
passing through the inside.

Therefore, when the rotating shaft 9 rotates by starting the rotational drive device 7, a pulse is output from the photosensor 71.

Therefore, by counting these pulses, the rotational speed of the rotary drive device 7 can be detected, and by performing feedback control or the like, the rotation of the rotary drive device 7 can be accurately controlled.

A hollow tube body 73 is fitted and fixed to the rotating shaft 9.

One end of this hollow tube body 73 is formed into a tapered device part 73F for removably attaching the sample container 11 such as the eggplant-shaped flask, and the other end is connected to the stator of the rotary drive device 7. The condenser 13 (the first
(see figure).

The condenser 13 is fixed to a screw portion 75 projecting from the center of the other end of the stator frame 59 with an annular nut 77.

As can be understood from the above configuration, since the rotation detector consisting of the photosensor 71 and the slit disk 69 is installed inside the stator frame 59 in close proximity to the stator core 63 etc.,
The rotary drive device 7 can be downsized as a whole.

Furthermore, since the rotational speed of the rotary drive device 7 is detected by the slit disk 69 and the photosensor 71, even if it is close to the stator core 63, etc., it will not be affected by electromagnetic effects, and even at extremely low speeds. However, the rotational speed can be detected accurately, and by performing feedback control or the like, the rotational drive device 7 can be accurately controlled even during low-speed rotation.

In the above configuration, depending on the size of the sample container 11 to be used, the inclination angle of the rotary drive device 7 can be arbitrarily set by operating the lever 19, and the height positions of the upper limit setting device 45 and the lower limit setting device 47 can be set as desired. Set as appropriate.

Thereafter, when the motor 39 is started and the lifting screw 27 is rotated in the forward direction, the lifting body 5 is raised, and the motor 39 is stopped at the position where the upper limit setting device 45 is activated.
rise is stopped.

When the elevating body 5 is raised and stopped in this way, the sample container 11 is removed from the rotation drive device 7,
A suitable sample is put into the sample container 11.

Next, when the rotation drive device 7 is started, the sample container 11 is rotated.

On the other hand, when the motor 39 is started and the lifting screw 27 is reversely rotated, the lifting body 5 is lowered and the sample container 11
from there into the water bath 15.

When the lower limit setting device 47 is activated due to the lowering of the elevating body 5, the motor 39 is stopped and the elevating body 5 is positioned at its stop position.

When the sample container 11 is rotated and heated in the water bath 45, the sample in the sample container 11 evaporates and becomes concentrated.

On the other hand, the steam is condensed in the condenser 13.

As mentioned above, when the elevating body 5 is moved up and down by the rotation of the motor 39, even if an unbalanced load is applied to the elevating body 5,
As mentioned above, the elevating body 5 is smoothly moved up and down.

Further, since the upper and lower limit positions of the elevating body 5 are arbitrarily set in advance, it is possible to efficiently perform concentration etc. repeatedly using sample containers 11 of the same capacity.

Furthermore, since the rotary drive device 7 does not include a speed reduction mechanism and is made smaller and lighter, the unbalanced load acting on the elevating body 5 is reduced.

As can be understood from the above description of the embodiments, the gist of this invention is as stated in the claims of the utility model registration. A relatively slight change occurs between the member and the elevating body, and the lower end of the elevating screw is also slightly movable in the horizontal direction, which prevents the elevating screw from bending. be.

Therefore, there is no problem in the threaded state of the nut member and the screw for lifting/lowering operation, and the vertical movement of the lifting body can be performed smoothly, and there is no occurrence of chattering noise or the like.

It should be noted that this invention is not limited to the above-mentioned embodiments, but can be implemented in other forms by changing the design of the greenhouse.

[Brief explanation of drawings]

Figure 1 is a front view of the evaporator, Figure 2 is a side view, and Figure 3 is a front view of the evaporator.
The figure is a longitudinal cross-sectional view of the main part, and FIG. 4 is a cross-sectional view of the rotary drive device. (Explanation of symbols representing main parts of the drawing), 3...
... Strut, 5... Lifting body, 21... Nut member, 25... Bullet machine, 27... Screw for lifting/lowering operation.

Claims (1)

[Scope of utility model registration request] The base side of an elevating body, which rotatably supports a sample container on the tip side, is fitted to a vertically erected post so as to be movable up and down, and a screw punch for elevating and lowering is provided parallel to the said post. A lifting actuation device for a rotary evaporator, which is configured to raise and lower the lifting body by rotation of the rotary evaporator, includes a nut member that is threadedly engaged with the screw for lifting operation and loosely passes through a fitting hole drilled in the lifting body. a flange having a diameter larger than the fitting hole diameter described above at one end of the nut member; a plurality of bolts loosely passing through bolt holes provided in the flange to connect the nut member to the elevating body; An elevating device for a rotary evaporator, characterized in that a bullet is provided between the head of the rotary evaporator and the flange to bias the flange against the elevating body.