JPH0253201B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to the structure of a pipe making machine for forming concrete hollow pipes such as hiums, centrifugal cast iron pipes, etc.

<Prior art> As shown in FIG. 3, conventional pipe making machines have a limit to the angle θ of the narrow angle formed by the formwork 3 for centrifugally forming the pair of tires 1 and 2 and the concrete pipe 4. In order to make the range of 60° to 20°, (a) a pipe-making machine with a range of diameters that can be made and an appropriate number of pipe-making machines with different tire spacing, (b) a pipe-making machine with different tire spacings. Some type of machine was used in which the axle could be moved to change the distance between the aircraft's tires.

<Problems to be solved by the invention> Among the above-mentioned conventional techniques, in the case of (a), there is a limit to the clamping angle of each pipe making machine, and many types of pipe diameters can be manufactured with one pipe making machine. Molding is difficult, and if the sandwiching angle is too narrow, the number of rotations of the tire will not be sufficiently transmitted to the mold, making it difficult to obtain the necessary rotation and taking time.

On the other hand, if the included angle is increased, the compressive force generated between the formwork and the tire increases, which acts as resistance and increases the consumption of driving force.

This posed the problem of having to install many pipe making machines with different tire spacings.

Method (b) requires a lot of time to move the axis, and by moving the axis, it is difficult to achieve parallelism with the axis that does not move, and the formwork during rotation of the pipe making. There was a problem that dangerous phenomena such as jumping were likely to occur.

<Means for Solving the Problems> The present invention was made to solve the problems of the conventional centrifugal force tube making machine as described above. The tires are supported by a reversible bearing that reverses around the center, and the tire spacing can be moved closer and further away by reversing the bearing.

Furthermore, the present invention allows one tire to be freely reversed around a fulcrum, and at each position of the reversed tire, the reversed tire is brought into contact with a vibration drive member that is capable of vertically swinging. This method efficiently produces concrete hollow tubes with excellent strength by applying a blow to the formwork and changing the vibration frequency, amplitude, etc. appropriately according to the rotation speed of the formwork.

<Function> Since the present invention has the above-described structure, when the diameter of the formwork is small, the bearing is rotated toward the mating tire to sandwich the gap between the tires.

Also, when the diameter of the formwork increases, the bearings are turned outward to widen the gap between the tires.

Moreover, it is brought into contact with a vibration drive member that can freely swing up and down regardless of the size of the tire interval.

<Embodiment> FIGS. 1 and 2 show a first embodiment of the present invention.

In FIG. 1, 11 is a frame, 12 is a fixed bearing, and 13 is a reversible bearing.

The fixed bearing is directly fixed to the frame 11, but the reversible bearing 13 is attached to the frame 11 so that it can be reversed about a shaft 14 serving as a fulcrum.

That is, as shown in FIG.
5 is fixed, and the shaft 14 is supported by this bearing 15.

Then, a bolt hole is provided in the reversing bearing 13,
It can be fixed onto a fixing base 17 on the frame 11 with bolts 16 in any orientation.

Note that 18 is the shaft of the tire 19 supported by the fixed bearing 12, and 20 is the shaft of the tire 21 supported by the reversible bearing 13.

In the case of the first embodiment described above, as shown by the solid line in FIGS. 1 and 2, the reversing bearing 13 is directed toward the fixed bearing 12, and the bolt 16 is attached to the fixing base 17 of the frame 11.
The center distance of the axes 18 and 20 is l
1, and the shafts 18 and 2 are fixed with the bolts 16 with the reversible bearing 13 facing outward as shown by the chain line a.
Assuming that the center distance l2 is 0', the center distance l3 between the axes 14 and 20 is (l2-l1)÷2.

Therefore, in the case of a small formwork 22, tires 19,
21 is set to 1, and in the case of a large formwork 23, the distance between tires 19 and 21' may be set to 12.

It is also conceivable to mount both tires on reversible bearings.

Next, FIGS. 3A and 3B show a second embodiment of the present invention, in which the tire 21 (21') is reversed.
A vibration generating foil 22 is rotatably provided at the shaft end of the shaft 20 (20') via a bearing or the like.

In this second embodiment, the reversing bearing 13 is
4, it can swing freely, and it is not fixed to a fixed base by bolts 16.

This shaft 2 is located directly below the shaft 20 (20').
A shaft 23 parallel to 0 (20') is rotatably arranged, and an eccentric disk 24 as a vibration driving member for lifting the vibration foil 22 is fixed to the shaft 23.

3A and 3B show the case where the tire 21 in FIG. 1 is inverted and is in the position of the tire 21', but even in the position before the tire 21 is inverted, there is vibration directly below it. A driving member is provided.

That is, the shaft 20 of the tire 21 (21') that is being reversed
Respective vibration drive members are provided directly below each of (20').

Further, the end portion 26 of the lever 25 provided in the middle of the shaft 23 is continuous with a connecting rod 27, and this connecting rod 27
is connected to a piston or the like and can freely slide left and right as shown in the figure.

The eccentric disk 24 is connected to the vibration foil 2 as shown in FIG. 3A.
There is a transition between a state in which it does not collide with the oscillating foil 22 and a state in which it collides with the vibration generating foil 22 as shown in FIG. 3B.

Therefore, in FIG. 3A, the outer periphery of the eccentric disk 24 is in the lowered position and is below the protrusion 28 of the vibrating foil 22, so that no vibration impact is applied to the formwork.

In the position shown in FIG. 3B, the outer periphery of the eccentric disk 24 protrudes above the protrusion 28 of the vibrating foil 22, so if the protrusion 28 of the rotating vibrating foil 22 rides on the eccentric disk 24, the protrusion The vertical movement occurs due to the difference from the case where it falls between 28 and 28, giving vibration and amplitude to the formwork.

<Effects of the Invention> As described above, this invention supports at least one tire by a reversible bearing, and the distance between the tires is made variable by reversing the reversible bearing, which is impossible with conventional technology. It is possible to cover a wide range of pipe diameters with one pipe making machine while maintaining a hot clamping angle.

Moreover, changing the distance between tires is simply by reversing the reversing bearing by 180 degrees, so there is no need to take troublesome measures to change the distance between the tires, which is required with conventional equipment, and the operating rate of the machine can be increased. , the number of pipe-making machines can also be kept to a minimum.

Further, since the reversing bearing is simply reversed around the fulcrum, it is possible to ensure sufficient parallelism accuracy with the tire mounted on the fixed bearing.

Furthermore, at each position of the reversing tire, a vibration drive member was provided which vibrates the reversing tire up and down and gives vibration and amplitude, so that the concrete aggregate in centrifugal force forming can be uniformly distributed throughout the whole, and
Since centrifugal molding is combined with vibration impact, molding efficiency is greatly improved, and compared to conventional molding using only vibration, the molding efficiency is 2.
It has the advantage that it can be molded in less than one-fold the time.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of the pipe making machine of the present invention, Fig. 2 is an enlarged front view of main parts showing the first example of the same, and Fig. 3 is a main part showing the second example of the same. An enlarged front view of. FIG. 4 is a front view of a conventional pipe making machine. 12... Fixed bearing, 13... Reversing bearing, 14...
... Axis serving as a fulcrum, 18, 20... Axis, 22, 23
...Formwork.

Claims (1)

[Claims] 1. A reversing bearing that inverts at least one of the pair of tires around a fulcrum in a pipe making machine that manufactures pipes by placing a formwork on a pair of tires and rotating it. 1. A tube making machine utilizing centrifugal force, characterized in that the tire spacing can be moved closer and further away by reversing the bearing. 2. A pipe making machine that manufactures pipes by placing a formwork on a pair of tires and rotating it, at least one tire of a pair of tires is supported by an inversion bearing that is inverted around a fulcrum, and the bearing By reversing the tire, the distance between the tires can be freely approached and separated, and at each position of the reversing tire, a vibration driving member that can swing the reversing tire up and down is provided to vibrate the reversing tire. A tube making machine that uses centrifugal force.