JPH0156808B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a rake steadying device for clarifiers, thickeners, etc., and particularly relates to a rake steadying device that improves a bearing section that supports the lower part of a stirring device consisting of a rake cage and a rake arm in high-concentration, high-viscosity slurry. In conventional clarifiers, thickeners, etc., overbridge systems and center column systems are common as structures for supporting stirring devices. In the overbridge method, a separate super structure is installed outside the main body of the clarifier, thickener, etc., and the super structure suspends and supports the stirring device so that it can rotate horizontally. This method requires a super structure, has economic losses due to the construction of the foundation structure, and has the disadvantage that the foundation structure may suffer from uneven settlement. In addition, in the center column method, the agitation device is supported by a center column installed and fixed in the storage tank body, but in this method as well, there is a need for a center column and the basic structure for setting and fixing the center column upright. This has disadvantages such as an economic loss due to the necessity of constructing a new structure, and a reduction in the storage rate of slurry based on the area occupied by the center column. As an alternative to the above-mentioned two types of clarifiers, thickeners, etc., there is a method in which a stirring device is directly suspended and supported by the main body of the clarifier, thickener, etc. Figure 1 shows an example of this, in which a structure B is constructed in the thickener main body A, and a rotational drive mechanism C installed in this structure B enables a stirring device D consisting of a rake cage D ₁ and a rake arm D ₂ to be rotated in the horizontal direction. The lower part of the stirring device D is supported by a bearing E to prevent the stirring device D from swinging during vibrations such as earthquakes, and to prevent eccentric movement during normal operation. . As shown in Fig. 2, this bearing part E has a plurality of supporting legs F made of steel pipes, H-shaped steel, and L-shaped steel arranged in a circumferential or rectangular shape, and is fitted centrally onto the upper part of the supporting legs F. It has a structure in which a support plate G is installed with an insertion hole _G1 ,
This bearing part E is erected and fixed on the bottom plate of the storage tank body A, and the shaft at the lower center of the stirring device D is inserted into the insertion hole _G1 to prevent swinging, eccentric movement, etc. of the stirring device D. There is. In the above-mentioned bearing part E, since the supporting leg F is a straight body, there is a possibility that the stress applied directly to the bottom plate through the supporting leg F becomes excessive when the horizontal load generated by an earthquake or the like is applied to the bearing part E. In view of the above-mentioned drawbacks of the bearings in clarifiers, stiffeners, etc., the present invention provides a rake steadying device that absorbs the load applied to the bearings and minimizes the force generated on the bottom plate. The purpose is to The present invention will be explained in detail below with reference to the drawings. 3 and 4 show a bearing according to the present invention, in which a plurality of supporting legs 1 made of steel pipes, H-shaped steel, L-shaped steel, etc. are arranged in a circumferential or rectangular shape. death,
A support plate 3 having a fitting hole 2 for inserting a shaft (not shown) drilled in the center of the lower part of the stirring device is installed and fixed on the upper part of the support leg 1, as in the conventional case. The lower part of the vertical body 1a of each support leg 1 is horizontally extended in the radially outward direction, and the tip of each horizontal body 1b is bent downward at a right angle to form a support plate 1c,
It is characterized in that a joint part 4 with the storage tank bottom plate is formed at the lower end of each support leg 1. According to the present invention described above, the horizontal load applied to the bearing part by the stirring device is absorbed by the elasticity of the vertical body 1a and the horizontal body 1b of the support leg 1, so the force generated on the bottom plate of the storage tank is minimized. This eliminates the risk of cracking the bottom plate. The following table shows a comparison of the axial force and bending moment generated on the bottom plate when the conventional type bearing and the present invention type bearing are used. It can be seen that the moments have decreased by 50% and 80%, respectively.

【table】

[Table] FIGS. 5 and 6 show other embodiments of the present invention, and the same reference numerals are used for the same parts as above. In FIG. 5, a plurality of supporting legs 1 bent at right angles are arranged in the radial direction, and on the horizontal part of each supporting leg 1,
A support plate 3 having a insertion hole 2 in the center is installed and fixed,
Support plate 5 with the lower end of each support leg 1 in a downward U-shape
The joint part 4 is provided at the lower end of each support plate 5, and the force applied to the bearing part is absorbed by the support leg 1 and the support part 5, and the force generated on the bottom plate is small. . Incidentally, in this embodiment, the same effect can be obtained even if the support legs 1 are arranged as linear bodies in a downwardly expanding inclined manner, and the lower end of each support leg 1 is fixed to the support plate 5 which is vertically provided. It is. Fig. 6 shows a plurality of linear support legs 1 arranged in an inclined manner with the lower part expanded, a support plate 3 having a fitting hole 2 is installed and fixed at the upper end of the support legs 1, and one end of each support leg is attached to an annular support plate. 5, and a plurality of joint parts 4 are provided protruding from the lower part of the support part 5. Also in this embodiment, the horizontal movement applied to the bearing part by the support leg 1, the support part 5, the joint part 4, etc. It is capable of absorbing loads and has sufficient strength especially against torsional stress.

[Brief explanation of drawings]

FIG. 1 is a schematic front view showing an example of a conventional clarifier, thickener, etc., FIG. 2 is a sectional view of a conventional bearing, and FIG. 3 is a plan view showing an embodiment of the bearing of the present invention. FIG. 4 is a sectional view of the same, and FIGS. 5 and 6 are perspective views showing other embodiments of the present invention. 1 is a support leg, 3 is a support plate, and 4 is a joint.

Claims (1)

[Claims] 1. A clarifier that suspends and supports the stirring device so that it can rotate horizontally and prevents the bearing from swinging;
In the rake center lower structure of a storage tank such as a thickener, a support plate 3 having a fitting hole 2 in the center and a joint 4 on the storage tank bottom plate disposed corresponding to this support plate 3 are suspended in the air. A rake steadying device characterized by being joined with a structural material made of aluminum.