JPH0243690Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a roll compaction concrete pipe making machine, and particularly to a support structure for rotating rolls.

[Conventional technology]

FIG. 4A shows a side view of a conventional pipe making machine, and FIG. 4B shows a cross section thereof taken along the line -2. What is indicated by the reference numeral 1 in the figure is a formwork. The formwork 1 is formed into a cylindrical shape by combining two semi-cylindrical parts so that they can be separated using, for example, fasteners. A ring frame 2 and a ring frame 3 are provided at both ends of the inner surface of the cylindrical formwork 1, respectively. These ring frame 2 and ring frame 3 are fixed to the formwork 1 when the formwork 1 is tightened using the aforementioned fastening fittings or the like. These ring frames 2
The outer circumferential surfaces of the ring frame 3 are each formed into a cylindrical shape so as to face the inner surface of the formwork 1, and a groove 2a and a groove 3a in the circumferential direction are bored in a part of the outer circumferential surface. Several pins 4 fixed to the formwork 1 are engaged with these grooves 2a and 3a to restrict movement of the ring frames 2 and 3 in the axial direction. Several pins 4 are welded to both ends of the formwork 1 so as to protrude radially inward along its circumference. Moreover, the inner circumferential surfaces 2b and 3b of the ring frames 2 and 3 come into contact with the outer surfaces of the rotating shafts 5 and 6 that pass through the formwork 1.
These rotating shafts 5 and 6 are supported at the left end in FIG. 4B, and are connected to a drive device via a transmission (not shown). The reference numeral A in the figure indicates a collar provided on the rotating shaft 5 and the rotating shaft 6, which contacts the ring frames 2 and 3 fixed to both ends of the formwork 1 and prevents the formwork 1 from moving in the axial direction.

A conventional pipe making machine has, for example, the structure described above. Therefore, when the drive device is started, the driving force is transferred to the rotating shaft 5 and the rotating shaft 6 through the transmission.
is transmitted to. Transmission from this drive device to the rotating shafts 5 and 6 was often performed by belt chains or the like. And that belt
The rotation transmitted by a chain or the like is transmitted by friction from the rotating shafts 5 and 6 to the ring frames 2 and 3, and then to the formwork to which the ring frames 2 and 3 are fixed. 1. Therefore,
When concrete material is supplied into formwork 1, formwork 1
Due to the centrifugal force generated by the rotation of the concrete material and the compaction force applied by the rotating shafts 5 and 6, the concrete material is brought into close contact with the space surrounded by the formwork 1 and the two ring frames 2 and 3, The desired concrete pipe 7 will be formed.

However, once the concrete pipe 7 is formed,
The formwork 1 is removed from the rotating shafts 5 and 6 with the concrete pipe 7 still inside. Then, the formed concrete pipe 7 is left as it is for a while until it solidifies reliably. Thereafter, when the concrete pipe 7 has solidified reliably, the molded concrete pipe 7 can be taken out by removing the fastening fittings and separating the formwork 1.

A conventional pipe making machine was configured as described above. The pipe making machine shown in FIGS. 4A and 4B uses cantilevered rotating shafts 5 and 6 held at one end.

Also, two rotating shafts are used to support the formwork 1 and apply rolling force.

[Problem that the invention attempts to solve]

However, in the conventional concrete pipe making machine, as mentioned above, the cantilevered rotating shafts 5, 6
The formwork 1 and ring frames 2 and 3 are placed on top of the frame 1, and the weight of the concrete pipe 7 is further added to the frame 1. In addition, since centrifugal force due to rotation is added on top of this, a large load is applied to the rotating shafts 5 and 6. As a result, the rotating shafts 5 and 6 are deformed or vibrate eccentrically, which is extremely dangerous for work. There was also an accident in which the formwork shook its head and fell.

[Means for Solving the Problems] The present invention aims to solve the problems of the prior art described above. Therefore, by supporting the tip of the cantilever rotating shaft with a bearing, we created a structure for a roll compacted concrete pipe making machine that holds the rotating shaft at both ends. Furthermore, the bearing can be freely attached to and detached from the rotating shaft so that it does not become an obstacle when the formwork is attached to and removed from the rotating shaft, so that the bearing can be moved horizontally and vertically.

〔Example〕

Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view of a roll compaction concrete pipe making machine. 5 and 6 are two rotating shafts that support the formwork (not shown). One end of the rotating shaft is connected to a drive device (not shown) and supported in a cantilever manner. Reference numeral 8 denotes a bearing that detachably holds the tip of the rotating shaft. Reference numeral 9 denotes a retractable arm, and a bearing 8 is attached to the central portion. Reference numerals 10 and 11 indicate two front receiving arms, which are connected to both ends of the retractable arm 9 and hold the retractable arm 9 in the horizontal direction. The front receiving arms 10 and 11 extend and contract in the axial direction of the arms, and rotate in the vertical direction near the bases of the arms. Therefore, the retractable arm 9, which is held at both ends by the arms 10 and 11, can move forward and backward in the axial direction of the rotating shafts 5 and 6, and can also rotate in the vertical direction with respect to the rotating shafts 5 and 6. 12 and 13 are protective side walls that surround the formwork (not shown) from the left and right sides, and are each made of two iron plates that are arranged facing each other with a gap left in between. During this time, the front receiving arms 10 and 11 are stored in the gap. Reference numeral 14 is an aggregate placed in the gap and serves as a counterbalance to hold the front receiving arms 10 and 11 in a horizontal state. The steel frame member 14 is connected to the main body 15. Inside the main body 15 are rotary shafts 5 and 6.
and a driving device for the front receiving arms 10 and 11 are housed.

FIG. 2 is a side view of the roll compaction concrete pipe making machine. A retractable arm 9 is attached to the tip of the front receiving arm 11. Reference numeral 16 denotes a projection fixed to the bottom surface of the retractable arm 9, which engages with a hole provided in the steel frame member 14 when the retractor is lowered and retracted in the axial direction of the rotating shaft 6. As a result, the retractable arm 9 is firmly fixed to the main body 15 via the steel frame member 14. Reference numeral 17 denotes a rotating shaft fixed to the rear portion of the front receiving arm 11, and is rotated by a chain belt 18. As a result, the tip of the front receiving arm 11 rotates up and down. Reference numeral 19 denotes a retraction air cylinder attached to the rear end of the front receiving arm 11 to move the front receiving arm 11 forward or backward. Note that the receiving arm 11 is on the same plane as the rotating shafts 5 and 6 in a horizontal state.

FIG. 3 is a plan view of the roll compaction concrete pipe making machine, showing a state in which the retracting arm 9 is lowered. The bearing portion 8 fixed to the retractable arm 9 is provided with two tapered convex portions 20 and 21. Further, tapered recesses 22 and 23 are provided at the tips of the rotating shafts 5 and 6. The recesses 22 and 23 are rotatably attached to the tips of the rotating shafts 5 and 6 via bearings 24 and 25, respectively. The convex portion and the concave portion have tapered shapes that engage with each other. The reason for the tapered shape is to ensure a large engagement tolerance. The reason why the bearings 24 and 25 are used is to minimize the friction that occurs between the engagement of the convex portion and the concave portion. Also, rotating shaft 5
This is to hold the tips of 6 and 6 in a rotating state.
Now, when the front receiving arms 10 and 11 are retracted by the retracting air cylinder, the protrusions 20 and 21 and the recesses 22 and 23 engage with each other.

Next, the operation of the roll compaction concrete pipe making machine will be explained based on FIGS. 1, 2, and 3.

With the front receiving arms 10 and 11 extended and rotated upward, the formwork is attached to the rotating shafts 5 and 6. Since the retractable arm 9 has a flipped-up shape, it does not become an obstacle to installation.

The front receiving arms 10 and 11 are rotated and lowered until they contact the steel frame member 14, etc., and the arms 10 and 11 are held horizontally.

Pull out the retractable arm 9 and remove the protrusion 2 of the bearing 8.
0 and 21 into the recesses 22 at the tips of the rotating shafts 5 and 6.
and 23, respectively. At this time, the protrusion 16 provided on the bottom surface of the retractable arm 9 simultaneously engages with the steel frame member 14 connected to the main body 15.

The rotary shafts 5 and 6 are rotated, fresh concrete is poured into the formwork, and roll compaction pipe production is performed.
At this time, the rotating shafts 5 and 6, which were originally supported on one side, rotate in a state where they are supported on both sides because their tips are held by the bearing 8. Therefore, eccentric head swing does not occur, and the formwork does not swing its head. At the same time, the bearing 8
Since the bearing 8 is firmly connected to the main body via the bearing 6 and the steel frame 14, no vibration occurs in the bearing 8. Other operations are the same as in the conventional example described above.

After completing the roll compaction, the retraction arm 9
Remove the formwork from the rotating shafts 5 and 6 by flipping it upward in the same manner as in .

[Effect of idea]

As mentioned above, according to the present invention, the tip of the rotary shaft, which was originally supported on one side, is held by a bearing, so
The rotating shaft rotates stably and can support heavy formwork and fresh concrete without eccentricity or vibration, which has a great safety effect. Furthermore, since the bearing is of a flip-up type, there is no obstacle to attaching and detaching the formwork, and the work can be carried out smoothly. Furthermore, since the bearing is mechanically fixed to the main body, there is no risk of vibration leakage.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the roll compaction concrete pipe making machine, Figure 2 is a side view of the roll compaction concrete pipe making machine, Figure 3 is a plan view of the roll compaction concrete pipe making machine, and Figure 4 is a plan view of the roll compaction concrete pipe making machine. Figures A and B are diagrams showing a conventional roll compaction concrete pipe making machine. 1... Formwork, 2, 3... Ring frame, 5, 6... Rotating shaft, 8
... bearing, 9 ... retractable arm, 10, 11 ... front receiving arm, 14 ... steel frame, 15 ... main body, 16 ... protrusion, 17 ... rotation axis of arm, 19 ... retractable air cylinder, 20, 21 ... convex part, 22, 23... recess.

Claims (1)

[Claims for Utility Model Registration] (1) A cylindrical formwork, a ring frame fixed to both ends of the inner surface of the formwork, and a rotating shaft that supports the formwork and ring frame and transmits rotational force to them. In a roll-compacted concrete pipe making machine consisting of a drive device that rotates the rotating shaft, two front receiving arms that rotate up and down and extend and contract with respect to the rotating shaft, and a A retractable arm is installed horizontally and has a convex portion, and by lowering and retracting the front receiving arm with the formwork attached to the rotating shaft, the convex portion provided on the retracting arm is removed from the rotary shaft. A roll compaction concrete pipe making machine characterized by engaging a concave portion provided at the tip. (2) The roll compacted concrete pipe making machine according to claim 1, wherein the convex part provided on the retractable arm and the concave part provided at the tip of the rotating shaft both have a tapered shape. . (3) The roll compacted concrete pipe making machine according to claim 1, wherein the recess provided at the tip of the rotating shaft is rotatably attached to the rotating shaft body. (4) The retractable arm is supported by a steel frame connected to the main body of the roll compacted concrete pipe making machine, and is provided with a protrusion that engages with the steel frame.Claim 1 of the Utility Model Registration Claim. The roll compaction concrete pipe making machine described.