JPH0228024Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a centrifugal forming apparatus for concrete pipes including humid pipes such as sewer pipes, drainage pipes, water supply pipes, and water conveyance pipes.

As is well known, conventional concrete pipe forming using centrifugal force was performed only by the centrifugal action generated when the mold pipe rotated. However, when molding is performed using only centrifugal force, most of the aggregate will migrate to the inner wall of the mold tube. In other words, there will be more aggregate near the inner wall of the mold tube, and the further away from the inner wall, the less aggregate will be present. (Note: The same phenomenon occurs depending on the size of the particles.) Therefore, the cross-sectional structure of the product obtained by this method will be uneven in the inner, middle, and outer layers, and in the case of small diameter pipes with thin pipe thickness, However, if the pipe is thick such as a large diameter pipe (for example, 1000 mm inner diameter and 82 mm thick to 3000 mm inner diameter and 220 mm thick), it will not be possible to obtain the strength corresponding to the set pipe thickness. This means that the existence of the inner layer is not essential in terms of strength;
In proportion to the volume of these non-essential parts, the amount of cement used becomes wasteful and the weight increases, which of course increases costs, as well as transportation, curing, storage, etc. This would have increased the labor involved in construction, etc. (Note: For example, in the case of a Huum tube, the inner diameter is 3000 mm, the thickness is 220 mm, and the length is
2430mm and 13200Kg. ) In order to eliminate the above-mentioned inconvenience, the applicant company previously proposed that ``two frames installed with a desired spacing, a desired number of drive shafts with drive rollers on the left and right, and driven shafts on the left and right. A desired number of vibrating and driven shafts having rollers are alternately installed horizontally via fixed bearings and movable bearings, and the distal end of an arm that is raised and lowered with the base end as a fulcrum is pivotally connected to the movable bearing, Furthermore, he proposed a "centrifugal forming apparatus for concrete pipes characterized by a vibrator for vertically vibrating the movable bearing" (patent application filed on May 20, 1981), and is currently in the prototype testing stage. However, it has already been confirmed that the intended purpose can be fully achieved.

The present invention was developed as a part of the previous application, and the purpose of the present invention is to provide a vibrator for vibrating the driven roller shaft of a conventionally well-known centrifugal molding machine so that each part is uniformly boned. The object of the present invention is to provide a centrifugal molding device for concrete pipes that can obtain molded products with distributed materials.

Another object of the present invention is that a movable bearing is pivotally attached to the tip of an arm that raises and lowers with the base end as a fulcrum, thereby imparting complex vibrations in different directions to the mold tube.
This provides a centrifugal forming apparatus for concrete pipes in which aggregate is evenly distributed in each part.

Next, an embodiment of the present invention capable of achieving the above object will be described in detail with reference to the accompanying drawings.

Reference numeral 1 indicates a desired number of drive shafts having driving rollers 1a on the left and right sides, 2 indicates a desired number of excitation and driven shafts having driven rollers 2a on the left and right sides, and 3 is arranged on the floor surface F at a desired constant interval. The driving shaft 1 is horizontally mounted on the frame 3 via a bearing 4, and the excitation and driven shaft 2 is connected to a substrate 5, a cushion material 6,
Both ends 7a of the diaphragm 7 are horizontally mounted via bearings 8. The movable bearing 8 is constructed as shown in the drawings, particularly in FIGS. 3 and 6. That is, in the same figure, 9 indicates an arm bearing fixed on the frame 3, 10 indicates an arm whose base end is pivotally connected to the arm bearing 9 via a shaft 11, and a movable arm is attached to the tip of this arm 10. A bearing 8 is pivotally mounted via a shaft 12.

Reference numeral 13 denotes a conventionally well-known mold tube (see FIG. 2) placed on the driving roller 1a and the driven roller 2a;
4 indicates a motor having a sprocket 14a,
The sprocket 14a is configured to rotate the mold tube 13 via a conventionally known power transmission mechanism, ie, a chain and a sprocket as shown in FIGS. 1 and 2.

15 and 16 are drive wheels rotating in opposite directions;
15a and 16a are drive wheel axles, 17 and 18 are driven wheels, 17a and 18a are driven wheel axles, 19 and 20 are toothed belts or chains that are wrapped around the drive wheels 15 and 16 and driven wheels 17 and 18, and 21 is a drive wheel. Gear casings 22 and 23 indicate driven wheel bearings, and drive wheels 15 and 16 are rotated at the same speed by a motor (not shown) provided at a desired location via an interlocking mechanism using gears in drive gear casing 21. The driving gear casing 21 and the driven wheel bearings 22, 23 are attached to the lower part of the diaphragm 7 via the connecting plate 24, thereby forming a vibrator.

In the above configuration, the tube mold 13 placed on the driving roller 1a and the driven roller 2a is rotated by the motor 14 in the direction of the arrow in FIG. 2 via the interlocking mechanism. On the other hand, as the driving wheels 15, 16 and the driven wheels 17, 18 rotate in the direction of the arrow in FIG.
5000 times) Due to this vibration, the driven roller 2a moves up and down together with the movable bearing 8 while being controlled by the arm 10. Therefore, the tube mold 13 moves obliquely up and down while rotating. In other words, complex vibrations in different directions are applied to the rotating tube mold 13, and as a result, the aggregate is uniformly distributed in each part. It is molded in.

Since the present invention is constructed as described above, it is possible to obtain a strong molded product with aggregate distributed uniformly in each part, and the tube thickness is smaller than that of the conventional product, so it has the same strength as the conventional product. Therefore, the amount of cement used can be reduced by that amount, and the weight can be reduced at the same time.

[Brief explanation of the drawing]

The drawings show an embodiment of the device according to the present invention, in which Fig. 1 is a plan view of the whole, Fig. 2 is a side view of the same, Fig. 3 is a plan view of a driven roller portion having a vibrator, and Fig. 4
The figure is a front view of the same as above, and FIG. 5 is a side view of FIG. 3 seen from the line V-V. DESCRIPTION OF SYMBOLS 1... Drive shaft, 1a... Drive roller, 2... Vibrating and receiving coaxial, 2a... Driven roller, 3... Frame, 8... Movable bearing, 10... Arm.

Claims (1)

[Scope of utility model registration request] A desired number of drive shafts with drive rollers on the left and right sides and a desired number of excitation and driven shafts with driven rollers on the left and right sides are attached to two frames installed with a desired spacing between fixed bearings and movable bearings. The movable bearing is alternately horizontally mounted through the movable bearing, and the distal end of an arm that raises and lowers with the base end as a fulcrum is pivotally connected to the movable bearing, and further includes a vibrator for vertically vibrating the movable bearing. Centrifugal forming equipment for concrete pipes.