JPH0315229Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a reinforcing bar bending machine for bending reinforcing bars used in reinforced concrete construction and the like into a predetermined shape.

[Technical background of the invention and its problems]

In reinforced concrete architecture, reinforcing bars of various shapes are combined into a network, which is embedded in a concrete wall or floor. FIG. 5 is a diagram showing an example of the shape of reinforcing bars P used when reinforcing the floor. Typical bending shapes and dimensions of this reinforcing bar are unified and widely used, and in Figure 5, the bending angle at the positions of symbols X and Y, the dimensions between X and Y, etc. are constant. It needs to be bent and shaped like this.

Conventionally, such reinforcing steel bending work has been done by using a hand tool called a hacker and performing two bending operations: first bending at the X position and then bending at the Y position. Ta. This method not only takes time, but also requires dimensioning work between X and Y.
The disadvantage is that work efficiency is low. Another method is to use a stationary type reinforcing bar bending machine to bend and form two locations at the same time, X and Y.
This conventional reinforcing bar bending machine is used while being installed at a predetermined position, and has the disadvantage that it is difficult to carry by a worker at a construction site because it is heavy and large.

[Purpose of invention]

The present invention has been made in consideration of these points, and an object of the present invention is to provide a reinforcing bar bending machine that is easy to handle and has good work efficiency.

[Summary of the idea]

The reinforcing bar bending machine of the present invention has an oil tank for storing oil in the casing body of the reinforcing bar bending machine, and uses an oil pump mechanism installed in the casing body to forcefully send pressure oil to the cylinder chamber, and slides into the cylinder chamber. The placed piston rod is moved forward and backward, this forward and backward movement is converted into rotational motion, and the bending arm is rotated to simultaneously bend two intermediate parts of the reinforcing bars into a predetermined shape and dimension by working with a pair of reinforcing bar receivers. It is characterized by being able to be bent.

[Example of idea]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a side sectional view of a reinforcing bar bending machine according to the present invention. In the figure, reference numeral 11 denotes an electric motor, which is attached to the casing body 13 with the motor shaft 12 inserted into the casing body 13. An oil tank 14 in which oil is stored is provided inside the casing body 13, and a pump mechanism 15 for pumping the oil in the oil tank 14 is also provided. The pump mechanism 15 includes a cam portion 16 formed at the tip of the motor shaft 12, a piston 17 that is reciprocated by the cam portion 16 via a needle bearing, and an on-off valve 18 disposed in an oil passage. , this on-off valve 18 is normally adapted to close the oil passage by a spring 19. A cylinder chamber 20 is formed approximately in the center of the casing body 13, and the cylinder chamber 20 and the oil tank 1 are connected to each other.
4 by a vertical wall 21. A plurality of pump mechanisms 15 (for example, three) are provided, and one pump mechanism 15 (in FIG. 1, the upper position is shown)
An oil supply passage 22 for supplying pressure oil from another pump mechanism 15a (indicated by a chain line at the bottom in FIG. 1) passes through the vertical wall 21 and communicates with the cylinder chamber 20. The cylinder chamber 20 is referred to as the oil tank 14.
They are communicated by a communication passage 23 provided through the vertical wall 21, and a spool valve mechanism 24 is disposed in the middle of this communication passage 23. Spool valve mechanism 24
, which functions to open and close the communication passage 23, is a cylindrical cylinder 25 formed on the vertical wall 21.
A spool 26 is disposed inside the cylindrical cylinder 25 so as to be slidable in the axial direction with a minute gap (for example, a diameter gap of 0.1 mm) between it and the inner wall of the cylindrical cylinder. The spring 27 is disposed within the cylindrical cylinder 25 so as to be in contact with the spring 27. The cylindrical cylinder 25 has a valve seat 28 formed in a forward position in the middle of a communication passage 23 that communicates the cylinder chamber 20 and the oil tank 14.
A communication passage 29 that communicates with one pump mechanism 15 of the plurality of pump mechanisms is opened at the rear.
Furthermore, a cylindrical cylinder 2 is attached to the tip of the spool 26.
A valve body 30 is formed to open and close the valve seat 28 in the valve seat 5 . When the pump mechanism 15 is not operating, the spool 26 is pushed up by a spring 27 until its rear end contacts the stopper 31. The vertical wall 21 has an oil tank 14 and a cylinder chamber 2.
An oil return path 32 is formed to communicate with the front end (the end opposite to the vertical wall 21) of 0, and this oil return path 32 passes through a pressure buffer chamber 34 in which an air bag 33 is disposed. It has been branched into. A pressure buffer chamber 34 is formed within the handle 35 of the hoop wrench. Further, a release hole 36 communicating with the pressure buffer chamber 34 is bored at an appropriate position closer to the front end than the middle of the cylinder chamber 20 .

Inside the cylinder chamber 20, a piston flange 37 is provided.
is arranged to be slidable in the axial direction, and a piston rod 38 is joined to the back surface of this piston flange 37. A rack 39 is provided at the tip of the piston rod 38, and a guide key 40 is attached thereto, and by slidingly engaging with a guide groove 41 formed in the casing body 13,
Accurate linear movement of the rack 39 is ensured. A piston flange return spring 42 is disposed between the back surface of the piston flange 37 and the stepped portion 13a of the casing body 13.

A rotating shaft 43 is disposed in the front part 13b of the casing body 13 in a direction orthogonal to the piston rod 38, with a part thereof protruding from the side surface of the casing body 13, and both ends thereof being rotatably supported. There is. FIG. 2 is a partial cross-sectional view showing the inside of the front portion 13b of the casing body 13. As shown in FIG. The rotating shaft 43 disposed inside the casing body 13 has a
A pinion 44 that engages with the rack 39 is fitted, and a central portion 45a of a bending arm 45 is fitted and connected to the portion that protrudes outside the casing body 13.

A rotating shaft 4 is provided at both ends of the bending arm 45.
3 and a pair of fixed shafts 51 fixed in parallel with each other,
Reinforcing bar bending rollers 50 are each rotatably mounted. This pair of folding rollers 50
The installation interval is X of the reinforcing bars to be bent,
It is determined by the dimension between Y (see Figure 5).
Further, the diameter and width of the bending roller 50 are determined by the diameter of the reinforcing bar to be bent and the bending radius.

Reference numeral 60 denotes a reinforcing bar receiving part, and this reinforcing bar receiving part 60 has a pair of bending rollers 50 in between.
They are fixed to the front portion 13b of the main casing 13 at intervals larger than this attachment interval. That is, a pair of flange portions 61 are provided on the front portion 13b of the main body casing 13 to project in the vertical direction, and a round bar-shaped reinforcing bar receiving portion 60 is positioned symmetrically with respect to the flange portion 61 with respect to the rotation axis 43. The rotary shaft 43 is arranged and fixed in parallel with the rotating shaft 43.

3 and 4 are a side view and a view from the direction of the arrow showing the appearance of the reinforcing bar bending machine 10 according to the present invention. As shown in these figures, the reinforcing bar bending machine 10 according to the present invention has a bending section consisting of a bending arm 45 to which a pair of bending rollers 50 are attached at the tip thereof, a pair of reinforcing bar receivers 60, etc. , this bent part,
By holding the handle 11b of the electric motor 11 and the handle 35 fixed to the casing body 13, the reinforcing bar P can be set at a predetermined position and a required bending operation can be performed.

Next, the operation of this embodiment will be explained.

First, a predetermined portion of the reinforcing bar P to be bent is set by passing it between a pair of bending rollers 50 and a reinforcing bar receiver 60, as shown in FIGS. 3 and 4. Next, when the switch 11a of the electric motor 11 is turned on, the motor shaft 12 is rotationally driven by the electric motor 11, and the cam 16 is rotated. This causes the piston 17 to reciprocate, sucking and compressing the oil in the oil tank 14 to generate pressure oil. The pressure oil generated by the pump mechanism 15 pushes up the on-off valve 18 against the spring 19,
Pressure oil is fed to the spool valve mechanism 24 through the passage 29 and generated by another pump mechanism 15a through the oil supply passage 22 to the cylinder chamber 2.
It is pumped into 0. The pressure oil fed to the spool valve mechanism 24 is fed from the rear of the cylindrical cylinder 25 and pushes the spool 26 forward against the spring 27. As the spool 26 moves forward, the valve body 30 at the tip is inserted into and engaged with the valve seat 28 of the cylindrical cylinder 25, thereby closing the opening of the valve seat 28. Thereby, a communication passage 2 that communicates between the oil tank 14 and the cylinder chamber 20
3 is blocked and occluded. Subsequently, the pressure oil that is pumped into the cylindrical cylinder 25 from the pump mechanism 15 is
It flows through the gap between the spool 26 and the inner diameter of the cylindrical cylinder 25 and is returned to the oil tank 14 through the communication path 23. As a result, the spool valve mechanism 24 maintains the communication path 23 between the oil tank 14 and the cylinder chamber 20 in a blocked state.

The pressure oil fed into the cylinder chamber 20 acts on the flange surface of the piston flange 37 and moves the piston flange 37 and the piston rod 38 to the left in FIG. 1 against the return spring 42. As a result, the rack 39 moves forward, the pinion 44 that meshes with the rack 39 is rotated, and the rotating shaft 43
and a bending arm 45 fitted thereto
rotates in the direction of the arrow in FIGS. 1 and 3.
Due to this rotational movement of the arm 45, the reinforcing bar P is pushed by the pair of bending rollers 50, and the portions located outside of the pair of bending rollers 50 abut on the pair of reinforcing bar receivers 60, respectively, and with this as a fulcrum, The portion in contact with the bending roller 50 is bent and deformed.

The bending angle is determined by the stroke of the piston rod 38, and by adjusting this stroke any desired bending angle can be obtained. In FIGS. 1 and 3, the symbol P' is
This figure shows the state of the reinforcing bars that have been bent.

To prevent the bending arm 45 from rotating too much during this bending operation and bending the reinforcing bar P more than necessary, the piston flange 37 is inserted into the release hole 36.
When the pressure oil in the cylinder chamber 20 passes through the position, the pressure oil in the cylinder chamber 20 is released into the pressure buffer chamber 34 and the oil tank 1 by the release hole 36.
4 and stops further advancement of the piston flange 37 and piston rod 38.

When the forward movement of the piston rod 38 is stopped and the bending operation by the bending arm 45 is completed, the switch 11a is turned off and the operation of the electric motor 11 is stopped. As a result, the supply of pressure oil from the pump mechanism 15 is stopped, the spool 26 of the spool valve mechanism 24 is pushed back rearward by the spring 27, and the engagement between the valve element '30 and the valve seat 28 is released. The cylinder chamber 20 and the oil tank 14 are communicated again through the communication passage 23, and the pressure oil in the cylinder chamber 20 is transferred to the oil tank 14.
, the piston flange 37 is returned to the return spring 42
It is pushed back to the right in Figure 1. As a result, the rack 39 is pulled back rearward (rightward in FIG. 1), causing the pinion 44 to rotate. This action returns the arm 45 to its original position, ready for the subsequent bending action. The bent reinforcing bar P can be removed from the bent portion by pulling it out in the lateral direction (in the direction of the rotating shaft 43).

Note that in this embodiment, the bending roller 5
A pair of fixed shafts 51 to which 0 is rotatably attached.
are fixed to both ends of the bending arm 45, but as a modification, if one of the fixed shafts 51 is made movable in the longitudinal direction, the interval between the pair of bending rollers 50 can be adjusted. I can,
The dimension between X and Y (see FIG. 5) of the reinforcing bar P to be bent and formed can be changed.

[Effect of idea]

As explained above, according to the present invention, the oil tank,
Since the piston actuating pump mechanism is built into the casing body of the rebar bending machine, there is no need for a separate oil supply unit like in conventional stationary rebar bending machines, making it easy to handle and improving work efficiency. can be achieved. In addition, a spool valve mechanism is disposed between the cylinder chamber and the oil tank so that the communication passage connecting the cylinder chamber and the oil tank can be automatically shut off and opened. Turn the electric motor switch ON-OFF
You can do it automatically by just doing this.

Furthermore, since it is equipped with a pair of bending rollers and a reinforcing bar receiving section, it is possible to simultaneously form two bending positions in one operation, resulting in extremely high work efficiency. Furthermore, the interval between the two folding points can always be kept constant, making it easy to standardize the product.

Further, the bending angle can be adjusted simply by adjusting the stroke of the piston rod, and in addition to a fixed bending angle, any desired bending angle can be obtained as desired. In addition, a release hole is provided at a desired position in the cylinder chamber to allow pressure oil to escape, so the swinging of the arm automatically stops at a predetermined position, preventing the reinforcing steel from being bent too much. .

The reinforcing bar bending machine according to the present invention can be applied not only to reinforcing bars but also to bending elongated rod-shaped bodies into a desired shape.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a reinforcing bar bending machine according to the present invention, Fig. 2 is a partially enlarged cross-sectional view of the tip of the reinforcing bar bending machine, and Fig. 3 is a side view showing the appearance of the reinforcing bar bending machine according to the present invention. 4 is an external view seen from the direction of the arrow in FIG. 3, and FIG. 5 is a plan view showing an example of the shape of the reinforcing bars to be bent. 11...Electric motor, 14...Oil tank, 15,1
5a...Pump mechanism, 20...Cylinder chamber, 2
2, 29... Oil passage, 23... Communication passage, 24...
Spool valve mechanism, 25... Cylindrical cylinder, 26...
...Spool, 27...Spring, 28...Valve seat, 30...Valve body, 36...Release hole, 37...
...Piston flange, 38...Piston rod,
39...Rack, 42...Return spring, 43...Rotating shaft, 44...Pinion, 45...Bending arm, 50...Bending roller, 60...Reinforcing bar receiver, P...Reinforcing bar.

Claims (1)

[Claims for Utility Model Registration] 1. A casing body in which an oil tank is provided; a plurality of pump mechanisms arranged in the casing body to pump oil stored in the oil tank; a cylinder chamber to which pressure oil is supplied from the pump mechanism; a piston flange disposed slidably in the axial direction within the cylinder chamber and having a piston rod joined to the back surface; a rack provided at the tip of the piston rod; and the casing. a rotating shaft rotatably supported at the front part of the main body with a portion protruding from the casing main body in a direction orthogonal to the piston rod;
a pinion fitted on the rotating shaft so as to mesh with the rack; a bending arm whose central portion is connected to the protrusion of the rotating shaft and a pair of bending rollers attached to both ends; A pair of reinforcing bar receivers fixed to the casing body with an arm in between, the spacing being larger than the mounting spacing of the pair of folding rollers. 2. The reinforcing bar bending machine according to claim 1, wherein the pair of reinforcing bar receiving parts are arranged at symmetrical positions with respect to the rotation axis.