JP4950090B2 - Stirring device with vibration control mechanism - Google Patents

Description

  The present invention relates to a stirring device provided with a vibration damping mechanism.

When the frequency resulting from the rotation of the stirrer is equal to or close to the natural frequency of the stirrer itself, the stirrer may resonate and the stirrer may vibrate with a large amplitude. In order to avoid such resonance, the natural frequency of the stirring device is analyzed, and the stirring device is designed to have a natural frequency that does not cause resonance (for example, patents). Literature 1 etc.).
JP-A-11-342399

  FIG. 6 shows an example of a stirring device provided with a vibration damping mechanism. In this stirring device, a stirrer 10 is attached on an upper mirror 22 of a stirring tank 20 containing a liquid 1 to be stirred. The stirrer 10 includes a motor 12 and a speed reducer 14 for rotating a rotary shaft 18 provided with a stirring blade 22, and a mount 16 that supports the motor and the speed reducer and through which the rotary shaft 18 passes. Then, by arranging a plurality of rod-shaped vibration damping supports 50 that support the gantry 16 on the upper mirror 22 of the agitation tank, the natural frequency of the agitation device is increased and the frequency caused by the rotation of the agitator. The resonance range is avoided.

  Such a configuration is an effective method, but when the stirrer and the stirrer are designed and manufactured by different manufacturers, the natural frequency of the finally assembled stirrer does not avoid the resonance range. It can happen. In addition, when a large number of accessories such as nozzles are arranged on the upper mirror 22, there may be no space for mounting the vibration damping support 50. Furthermore, when the agitation tank becomes hot due to the agitation operation, for example, when the agitation tank is heated with a heater, when the liquid in the agitation tank causes an exothermic reaction due to agitation, or when a high-temperature liquid is introduced into the agitation tank The support point A on the upper mirror 22 of the vibration damping support 50 moves to the outside due to the thermal expansion of the stirring tank 20, and stress is generated in the vibration damping support 50, and the upper mirror 22 of the vibration damping support 50 and This design may not be easy because a large load is applied to the support points A and B with the gantry.

  Therefore, in view of the above problems, the present invention can avoid the resonance range of the natural frequency of the assembled stirring apparatus even when the stirring tank and the stirrer are designed and manufactured by different manufacturers. An object of the present invention is to provide an agitation device having a vibration control mechanism that can be installed even when there is no space on the upper mirror, and that does not apply a large load even when the agitation tank is thermally expanded by an agitation operation. And

  In order to achieve the above object, a stirrer according to the present invention includes a stirrer in which the temperature in the tank rises due to a stirring operation, a stirrer attached to the upper part of the stirrer, and the stirrer and stirrer And a coupling member that couples the agitator and the frame, and the coupling member is configured to increase the tension applied to the coupling member by starting a stirring operation. Is connected to the agitator and the frame.

  The coupling member is connected to the stirrer so as to be pivotable up and down around one end connected to the stirrer, and up and down around the other end connected to the frame. It is preferable that the frame is also connected to the frame so as to be able to turn. Moreover, it is preferable that the said coupling member is equipped with the tension adjustment mechanism which adjusts the tension | tensile_strength of this coupling member, for example, a turnbuckle.

  Thus, according to the present invention, a frame is installed around the stirring tank and the stirrer, and the frame and the stirrer are coupled by the coupling member, and the connection between the agitator and the frame of the coupling member is connected. When the agitation tank is thermally expanded by the agitation operation, by connecting so that the tension applied to the coupling member is increased, the agitation device is firmly coupled to the frame via the coupling member, and the natural frequency of the agitation device is reduced. Can be significantly increased. Therefore, even if the natural frequency of the stirring device is at or near the resonance region, it greatly deviates from the resonance region during the stirring operation.

  Hereinafter, an embodiment of a stirring device according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view schematically showing one embodiment of a stirring device according to the present invention. FIG. 2 is a schematic plan view of the stirring device of the present embodiment.

  As shown in FIG.1 and FIG.2, the stirring apparatus of this Embodiment is mainly comprised from the stirrer 10, the stirring tank 20, and the frame 40 installed so that these stirring machines and the whole stirring tank might be enclosed. It is configured. The stirrer 10 includes a motor 12 and a speed reducer 14 for rotating the rotating shaft 18, and a gantry 16 that supports them. The gantry 16 is attached to the upper mirror of the stirring tank 20. The rotating shaft 18 extends through the gantry 16 to the vicinity of the bottom in the stirring tank 20. In the gantry 16, the rotary shaft 18 is provided with a bearing and a shaft seal. In the stirring tank 20, the rotating shaft 18 is provided with a stirring blade 24 for stirring the liquid 1 in the tank.

  The frame 40 is usually installed for maintenance of the agitator 10 and the agitation tank 20, and has a plurality of layers such as a frame second floor 42 and a frame third floor 43. Among these, for example, the frame 3 floor 43 is installed at a height corresponding to the height of the frame 16 of the agitator. And the frame 3 floor part 43 and the mount frame 16 are couple | bonded by the four tension bars 30 extended from 4 directions. The structure around the tension bar 30 is enlarged and shown in FIG.

  As shown in FIG. 3, one end of the tension bar 30 on the stirrer side is pivotally connected to a stirrer side bracket 31 fixed to the gantry 16 of the stirrer. The structure will be described. FIG. 4 is a front view showing the structure of the tension bar 30, and FIG. 5 is a plan view showing the structure of the agitator side bracket 31. As shown in FIGS. 4 and 5, pin holes 37 extending in the horizontal direction are provided at both ends of the tension bar 30, and the two parallel supporting plates 38 of the stirrer side bracket 31 are also the same. Further, a pin hole 39 extending in the horizontal direction is provided. One end of the tension bar 30 is sandwiched between the two support plates 38, and one pin 32 passes through the pin hole 37 of the tension bar and the two pin holes 39 of the stirrer side bracket. With such a structure, the tension bar 30 is connected to the agitator-side bracket 31 so as to be able to turn around the pin 32. The other end of the tension bar 30 on the gantry side is also pivotably connected to the gantry side bracket 36 fixed to the third floor portion 43 of the frame in the same manner as described above.

  The tension bar 30 includes two bars, a stirrer-side bar 33 and a frame-side bar 34, and a turnbuckle 35 that connects these bars. Female screws are cut at both ends of the turnbuckle 35, one being a right screw and the other being a left screw (reverse screw). Further, male screws are cut at the ends of the two bars 33 and 34 on the turnbuckle side. With such a structure, by rotating the turnbuckle 35, the male screw can be tightened or loosened to the female screw, and the entire length of the tension bar can be shortened or lengthened. .

  According to the above configuration, first, when the stirrer is stopped, as shown in FIG. 3, the gantry side bracket 31 a fixed to the gantry 16 of the stirrer includes the framing side bracket 36 fixed to the third floor portion 43 of the framing unit. Located at the same height, the tension bar 30 extends in the horizontal direction. The stirring operation of the stirrer is started, the motor 12 of the stirrer 10 is started, and the rotating blade 24 provided at the tip of the rotating shaft 18 is rotated to stir the liquid 1 in the stirring tank 20. When the temperature of the agitation tank 20 rises due to the agitation operation, the agitation tank 20 is thermally expanded, thereby moving the position of the agitator 10 upward. That is, as shown by a broken line in FIG. 3, the gantry side bracket 31 b moves to a position higher than the framing side bracket 36.

  Thereby, since the tension bar 30 is extended in the length direction, a tensile stress (tension) corresponding to the extension is generated in the tension bar 30. When a large tension is applied to the tension bar 30 connecting the stirrer and the frame in this manner, the stirrer is firmly coupled to the frame 40 via the tension bar 30, and the natural frequency of the stirrer is independent of the stirrer. It will rise significantly than if it was. Therefore, it can be avoided that the stirring device has a resonance region with the frequency derived from the rotation of the stirrer 10.

  The tension applied to the tension bar 30 increases as the elongation rate of the tension bar increases. Therefore, when the amount of movement Δh upward of the stirrer 10 is the same, the tension bar 30 can be given a stronger tension when the length of the tension bar 30 is shorter. Conversely, when the amount of movement Δh of the stirrer 10 is large and the tension becomes excessive, the length of the tension bar 30 is increased. Since the length of the tension bar 30 can be accommodated by changing the installation position of the frame side bracket 36 in the frame 40, the degree of freedom in design is high. For example, when the stirring device has a height of about 12 m and a width of about 8 m, and the frame has a width of about 15 m, the length of the tension bar 30 is preferably designed to be 1 to 2 m. In addition, the tension applied to the tension bar 30 can be adjusted by adjusting the length of the tension bar 30 by the turnbuckle 35 or adjusting the tolerance of the pin 32 and the pin hole 37 of the stirrer side bar 33. it can.

  Furthermore, when the amount of movement Δh upward of the stirrer 10 is small and the tension applied to the tension bar 30 during the stirring operation is small, the tension bar 30 can be pre-tensioned in advance by the turnbuckle 35. Thereby, even if the moving amount Δh of the stirrer 10 by the stirring operation is small, it is possible to apply tension to the tension bar 30 so that the stirrer is firmly coupled to the frame.

  Normally, the natural frequency of the stirring device in a state of being firmly coupled to a large-scale facility such as a frame is greatly different from the frequency derived from the rotation of the stirrer, but in order to reliably obtain the effects of the present invention, The eigenvalue analysis of the stirrer in a state where the stirrer and the frame are firmly connected by the tension bar is performed, and the natural frequency of the stirrer in this state avoids the resonance region caused by the rotation of the stirrer. It is necessary to confirm.

  In the present embodiment, as shown in FIG. 2, the four tension bars 30 support the stirrer 10 from four directions. If the stirrer 10 can be supported with an equal force in this way, the tension can be increased. The number of bars is not limited. For example, it is preferable to combine the stirrer and the frame with four or more directions or four or more tension bars.

  Further, in the present embodiment, as shown in FIG. 3, the tension bar 30 before the stirring operation is installed so as to extend in the horizontal direction, but when the position of the stirrer 10 is raised by heat, the tension bar 30 If the tension concerning 30 increases, it will not be limited to a horizontal direction, For example, the stirrer side may be installed in the high direction.

It is a front view which shows typically one Embodiment of the stirring apparatus which concerns on this invention. It is a top view which shows typically the stirring apparatus shown in FIG. It is a front view which expands and shows the structure of the tension bar vicinity of the stirring apparatus shown in FIG. It is a front view which shows the tension bar shown in FIG. It is a top view which shows the stirrer side bracket shown in FIG. It is a front view which shows an example of the conventional stirring apparatus typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid 10 Stirrer 12 Motor 14 Reduction gear 16 Base 20 Stirrer tank 22 Upper mirror 24 Stirrer blade 26 Shaft seal 30 Tension bar 31 Stirrer side bracket 32 Pin 33 Stirrer side bar 34 Frame side bar 35 Turnbuckle 36 Frame side bracket 37 Pin hole 38 Support part 39 Pin hole 40 Frame 42 Frame 2 floor 43 Frame 3 floor 50 Damping support

Claims (3)

A stirring tank in which the temperature in the tank rises by stirring operation, a stirrer attached to the upper part of the stirring tank, a frame installed around the stirring tank and the stirrer, and the stirrer and the frame In the agitation device including the coupling member to be coupled , when the coupling member is stretched in the length direction, a tension is generated according to the elongation, and the coupling member is high in the horizontal direction or the stirrer side. Is connected to the stirrer and the frame in the direction, and by starting the stirring operation, the stirring tank is thermally expanded, and the connection position between the coupling member and the stirrer is moved to a higher position. A stirring device that increases the tension applied to the coupling member .   The coupling member is connected to the stirrer so as to be pivotable up and down around one end connected to the stirrer, and the other end connected to the frame is connected to the stirrer. The stirrer according to claim 1, which is also connected to the frame so as to be pivotable up and down on an axis.   The stirring device according to claim 1 or 2, wherein the coupling member includes a tension adjusting mechanism that adjusts a tension of the coupling member.

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