JPH066212B2 - Bending correction machine - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a bending correction machine for correcting bending of a reinforcing bar or the like,
In particular, it relates to a portable bending correction machine which is excellent in handling workability.

[Technical background of the invention and its problems]

At a construction site or the like, there is a case where a work of correcting the bending of the already assembled rebar or bending it into a predetermined shape is required. In such a case, conventionally, a bending correction machine has been used in which the reinforcing bars are abutted against the pair of reinforcing bar receiving arms, and the hooks are reciprocally moved to push and correct the reinforcing bars. The hook is connected to a piston rod of a hydraulic cylinder, and the hook is reciprocally driven by feeding pressure oil to the hydraulic cylinder. The pressure oil includes an oil storage tank and a pump. The oil is supplied from the separately installed oil supply unit through the hydraulic hose, and then returned to the separately installed tank through the hydraulic hose again.

Therefore, when working at a relatively high position or at a construction site where workers often move, there are problems such as the connected hydraulic hose being obstructed and the location of the separate refueling unit being difficult. . Further, there is a problem in that the portion of the reinforcing bar to be bent and corrected may be difficult to work in relation to the position of the operator, and the bending and correction machine must be operated in a posture that is difficult to handle.

[Object of the Invention]

The present invention has been made in consideration of such points,
An object is to provide a portable bending correction machine which is easy to handle and has excellent workability.

[Outline of Invention]

The present invention is a bending correction machine for correcting the bending of a rod-shaped member by reciprocally moving a correction hook with respect to a receiving arm attached to the front part of a casing body, wherein the receiving arm moves around the outer periphery of the casing body. It is characterized by being mounted so that it can turn.

According to the present invention, since the receiving arm of the bending corrector is attached so as to be rotatable around the outer periphery of the casing main body, the receiving arm is pivotally moved according to the position of the rod-shaped member to be corrected, and the bending arm is bent in a posture easy to work. A modifier can be used.

Example of Invention

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an external view of a bending correction machine according to the present invention. In the figure, reference numeral 11 is an electric motor, and the electric motor 11 is connected and fixed to the rear end of the casing body 12. A rod-shaped member R such as a reinforcing bar is provided on the front portion of the casing body 12.
The receiving arm 13 is attached to the outer periphery of the casing body 12 so as to be rotatable. A pair of receiving arms 13 are attached at intervals, and a correcting hook 14 that cooperates with the receiving arms 13 to correct the bending of the rod-shaped member R is disposed between the receiving arms 13. The hook 14 has a concave shape so as to give a pressing or pulling correction force to the rod-shaped member R, and is attached to the tip of a piston rod 15 described later. Reference numeral 16 is a handle provided with the switch S of the electric motor 11, and reference numeral 17 is an auxiliary handle attached to the front portion of the casing body 12.

FIG. 2 is a sectional view showing the internal structure of the bending correction machine 10 according to the present invention. An oil tank 18 for storing oil is provided inside the casing body 12, and a pump mechanism 19 for pumping the oil in the oil tank 18 is also provided. The pump mechanism 19 includes a cam portion 2 formed at the tip of the motor shaft 20.
1 and a piston 2 reciprocally moved by the cam portion 21
2, the high-pressure oil is generated by the reciprocating movement of the piston 22. The casing body 12 is divided by a vertical wall 23 into an oil tank 18 in which a pump mechanism 19 is arranged and a cylinder chamber 24, and the pump mechanism 19, the oil tank 18,
The cylinder chambers 24 communicate with each other through oil passages provided in the vertical wall 23.

The oil passage is the oil supply passage 2 connected to the pump mechanism 19.
5, a reverse oil passage 26 having an opening on the front side of the cylinder chamber 24, a forward oil passage 27 having an opening on the rear side of the cylinder chamber 24, and a return passage 28 communicating with the oil tank 18, inside the vertical wall 23. A switching valve 30 provided in the switch allows the oil flow path to be switched.

The switching valve 30 has a substantially columnar shape, and is rotatably attached to a cylindrical cylinder 29 formed in the vertical wall 23. The other end of the oil supply passage 25, the backward oil passage 26, the forward oil passage 27, and the return passage 28 are all open to the cylindrical cylinder 29.

FIG. 3 and FIG. 4 are partially enlarged views showing a state in which the switching valve 30 is inserted. The switching valve 30 is formed in a bilaterally symmetrical shape, and a through passage 31 is provided in the symmetric axis direction, and a taper 32a is formed in a divergent shape starting from a point separated by Δl from the end of the through passage 31. 32b is formed. The taper 32a, 32b and each of the oil passages described above have one taper 32a and the cylindrical cylinder 29.
When the oil supply passage 25 and the retreat oil passage 26 are communicated with each other by the space 33a formed between the inner wall and the inner wall, the forward oil passage 27 and the return passage 28 have the other taper 32b and the inner wall of the cylindrical cylinder 29. And the taper 32 on one side while communicating with each other by a space 33b formed between
When the retreat oil passage 26 and the return passage 28 communicate with each other by the space formed between the oil supply passage 25 and the forward oil passage 27, the space formed between the other taper 32b and the oil supply passage 25 and the forward oil passage 27. Are communicated with each other (see FIG. 4). Further, the cylindrical cylinder 2 of the oil supply passage 25
The opening diameter d that opens into the inside 9 is slightly larger than the distance Δl from the end of the through passage 31 to the end of the taper 32a, 32b. The return passage 28 includes an oil supply passage 25,
An opening 28 is provided at a position facing the opening of the backward oil passage 26 and the forward oil passage 27 to the cylindrical cylinder 29.
It is branched so as to have a, 28b, and 28c. Openings 28a and 28c are formed in the divergent portion of the switching valve 30.
Alternatively, a concave groove 34 that communicates the openings 28b and 28c
Is formed, and the groove 34 is further communicated with the through passage 31.

The switching operation of the switching valve 30 can be performed by rotating the lever 48 (FIG. 1) connected to the valve end.

In the cylinder chamber 24, a piston 35 having a rear surface to which the piston rod 15 is joined is disposed slidably in the axial direction, and the front side 24a of the cylinder chamber 24 (left side in FIG. 2).
The piston rod 15 is moved backward by the pressure oil supplied to the piston rod 15, and the piston rod 15 is moved forward by the pressure oil supplied to the rear side 24b (right side in FIG. 2) of the cylinder chamber 24. There is. The piston 35 is provided with a plurality of through holes 36a and 36b in the axial direction,
The through hole 3 is provided in each of the through holes 36a and 36b.
Valve bodies 37a, 37b having a shape capable of closing 6a, 36b
From the rear by the spring 38 through holes 36a, 36a
It is arranged so as to be biased toward the opening of b. The plurality of valve pairs 37a, 37b are respectively provided with pistons 35 at their tips.
Have projections 39a and 39b projecting from the end face thereof, and one projection 39a projects in the front cylinder chamber 24a and the other projection 39b projects in the rear cylinder chamber 24b. Has been done. Reference numeral 40
Is a screw for receiving the spring 38, and is hollow so that oil can pass therethrough.

A pair of springs 41a and 41b are attached to the outer peripheral portion of the piston 35, which is smaller inward than the sliding portion, so as to project from the piston end surface into the front cylinder chamber 24a and the rear cylinder chamber 24b, respectively. ing.

The front end side of the cylinder chamber 24 is sealed by an end wall 42, and the piston rod 15 projects forward through the end wall 42.

In the outer peripheral portion of the casing body 12, there is a space 4 for pressure buffering.
3 is provided, and this cavity 43 has a rubber film 44 with elasticity.
Are covered by. Further, the space 43 and the oil tank 18 are connected by a release passage 45.

A circumferential groove 46 is formed on the outer periphery of the front portion of the casing body 12, and the receiving arm 1 of the rod-shaped member is fitted into the circumferential groove 46.
A ring member 47, to which the rear end portion of 3 is fixed, is rotatably fitted. The degree of fitting of the ring member 47 is preferably such that the receiving arm 13 can be manually swung. The auxiliary handle 17 is also fixed to the ring member 47.

Although not shown, a release passage connected to the oil tank 18 is connected in the middle of the oil supply passage 25, and a safety valve that opens the valve when a pressure higher than a predetermined pressure is used is arranged in the middle of the oil supply passage 25. As a result, it is possible to prevent an overload from being applied to the pump mechanism 19 or the electric motor 11 even when the rod-shaped member having a bending correction capability or more is used.

Next, the operation of this embodiment having such a configuration will be described.

First, it is determined whether the rod-shaped member R to be modified is modified by pulling (modifying by moving the hook 14 backward) or by pressing (modifying by moving the hook 14 forward). Lever 48 at position 30
Select by operating. In FIG. 2, the switching valve 30 is in a position to be corrected by pulling. Next, as shown in FIGS. 1 and 2, the rod-shaped member R is
It is inserted and arranged between the tip protrusion 13 a of the receiving arm 13 and the hook 14. In the case of the tension correction, as shown in the drawing, the rod member R is brought into contact with the front side of the projection 13a, and in the case of the pressing correction, it is arranged so as to be brought into contact with the rear side of the projection 13a.

When the switch S of the electric motor 11 is pressed after setting the rod member R and the bending corrector in this way, the motor shaft 20 and the cam 21 are rotationally driven, and the piston 22 reciprocates to suck the oil in the oil tank 18. Compress to generate pressure oil. The pressure oil generated by the pump mechanism 19 is pressure-fed to the cylindrical cylinder 29 through the oil supply passage 25, and is supplied to the retreat oil passage 26 through the space 33a as shown in FIG. The pressure oil supplied to the reverse oil passage 26 is introduced into the front cylinder chamber 24a, whereby the piston 35 is pressed and moves backward (to the right in FIG. 2). Piston 3
The piston rod 15 and the hook 14 retreat by the retreat of 5, and the rod-shaped member R is stretched and bent with the receiving arm 13 for correction.

During this time, the oil in the rear cylinder chamber 24b is returned to the oil tank 18 through the forward oil passage 27, the space 33b, and the return passage 28.

When the piston 35 moves backward to the final position, the protrusion 39b of the valve body 37b mounted on the piston 35 causes the vertical wall 23 to move.
Of the valve element 37b against the spring 38, and the valve element 37b retracts. As a result, the through hole 36b is opened, and the pressure oil in the front cylinder chamber 24a flows into the rear cylinder chamber 24b. This stops the movement of the piston 35 and prevents the pump mechanism 19 and the electric motor 11 from being overloaded. At this time, the spring 4
1b is compressed between the piston 35 and the vertical wall 23, and the elastic force of this spring 41b causes the piston 35 to move.
End surface of the valve slightly lifts from the vertical wall 23, and the valve body 37b
Thereby, the through hole 36b is closed at an appropriate position, the pressure oil is prevented from escaping, and the backward movement cannot be prevented. Thus, by releasing the pressure oil in the cylinder chamber at the final movement position of the piston 35, the switching valve 30 is prevented from becoming heavy, and the switching operation can be easily performed.

Next, when bending the rod-shaped member R by pressing, the rod-shaped member R is set between the hook 14 and the receiving arm 13 as described above, and the switching valve 30 is moved to the position shown in FIG. The rotation is switched to the position shown. During this switching operation, the opening diameter d of the oil supply passage 25 is made slightly larger than the distance Δl from the end of the through passage 31 to the ends of the tapers 32a and 32b, so the distance Δ of the switching valve 30. The oil supply passage 25 is not completely sealed by the portion l. Therefore, during the switching operation of the switching valve 30, the electric motor 11 is driven and the pump mechanism 19
Even if pressure oil is fed from the
1 and the recessed groove 34 to escape to the return passage 28, and the load of the pump mechanism 19 does not rise suddenly and fail.

After switching the switching valve 30 to the position shown in FIG. 4, when pressure oil is supplied from the pump mechanism 19 to the oil supply passage 25, the pressure oil is formed between the taper 32 b and the inner wall of the cylindrical cylinder 29. It flows through the space to the forward oil passage 27, and further flows into the rear cylinder chamber 24b. As a result, the piston 35 moves forward in the left direction in FIG. 2, and the piston rod 15 and the hook 14 perform forward pressing movement. When the piston 35 moves to the final advance position, similarly to the above, the projection 39a of the valve body 37a contacts the end wall 42, the valve body 37a retracts, and the pressure oil in the cylinder chamber 24b is discharged from the through hole 38. Release into the cylinder chamber 24a.
During the forward movement, the oil in the front cylinder chamber 24a is
The oil is returned to the return passage 28 and the oil tank 18 through a space formed between the reverse oil passage 26, the taper 32 a of the switching valve 30 and the inner wall of the cylindrical cylinder 29.

Also, when the switching valve 30 is switched from the position shown in FIG. 4 to the position shown in FIG. 3, the oil supply passage 25 is not completely sealed in the switching valve 30, and the pump mechanism 19 is not completely closed. Also, failure due to overload of the electric motor 11 is prevented.

When working with the bending correction machine 10 according to the present embodiment, the operator usually operates the handle 16 and the auxiliary handle 17.
And holding the receiving arm 13 and the hook 14 against the rod-shaped member R to be corrected. In this case, if the receiving arm 13 and the hook 14 cannot be arranged at positions where it is easy to work due to the relation between the position of the worker and the position of the rod-shaped member, the auxiliary handle 17 or the receiving arm 13 may be manually rotated. , Can be set to the optimum position.

[Advantages of the Invention] As described above, according to the present invention, the oil tank and the piston actuating pump mechanism are built in the casing body of the bending correction machine, so that a separate oil supply unit is required as in the conventional case. Therefore, handling is easy and work efficiency can be improved. Further, since the receiving arm is attached so as to be rotatable, the operator can use the bending correction machine at a position where he can work most easily, and the work can be performed efficiently and easily. Further, since no pipes for oil feeding are arranged on the outer periphery of the casing main body, there is no possibility of causing an obstacle during work or causing a pipe breakage accident.

[Brief description of drawings]

FIG. 1 is an external view of a bending correction machine according to the present invention, FIG. 2 is a sectional view of the bending correction machine, and FIGS. 3 and 4 are partially enlarged views of a switching valve. 12 ... Casing body, 13 ... Receiving arm, 14 ... Hook, 15 ... Piston rod, 18 ... Oil tank, 19 ... Pump mechanism, 24 ... Cylinder chamber, 25 ... Oil supply passage, 26 ... Retracting oil passage, 27 ... Forwarding Oil passage, 28 ... Return passage, 2
9 ... Cylindrical cylinder, 30 ... Switching valve, 31 ... Through passage,
35 ... Piston, 37a, 37b ... Valve body, 39a, 39
b ... protrusion, 41a, 41b ... spring, 46 ... circumferential groove.

Claims (2)

[Claims] 1. A bending correction machine for correcting the bending of a rod-shaped member by reciprocally moving a correction hook with respect to a receiving arm attached to the front portion of a casing body, wherein a ring is provided on the outer periphery of the front portion of the casing body. A bending correction machine, wherein a member is rotatably fitted, and a rear end portion of the receiving arm is fixed to the ring member. 2. The bending correcting machine according to claim 1, wherein a pair of receiving arms are attached at intervals, and a correcting hook is arranged between the receiving arms. .