JPH0810444Y2 - Portable hydraulic rebar bending machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic rebar bending machine, and more particularly to an improvement of a portable hydraulic rebar bending machine which is preferably used for bending a reinforcing bar protruding from a concrete structure.

[0002]

2. Description of the Related Art As a device for bending a reinforcing bar, (a)
A hydraulic cylinder for linearly moving a piston by hydraulic pressure; (b) a rotary shaft disposed at a position offset from the axial center of the hydraulic cylinder at right angles to the axial center of the hydraulic cylinder; and (c) the rotary shaft. And a rotation mechanism which is disposed between the rotation axis and the piston and which rotates the rotation axis around its axis in accordance with the linear movement of the piston, and (d) causes the rotation axis to protrude in the radial direction. A rotating arm that is provided in the rotating body and is rotated integrally with the rotating shaft; and (e) a first receiving member that is integrally provided with the hydraulic cylinder at substantially the same position as the rotating shaft. (F) It is arranged at the tip side portion of the rotating arm and is positioned on the opposite side of the first receiving member with the reinforcing bar to be bent interposed therebetween, and the reinforcing bar is rotated with the rotation of the rotating arm. A bending member to be brought into contact with the rebar, and (g) the rebar A second receiving member integrally disposed with the hydraulic cylinder on the side opposite to the first receiving member and on the side opposite to the bending member across the first receiving member in the longitudinal direction of the reinforcing bar. There is known a portable hydraulic rebar bending machine having and. Such a hydraulic rebar bending machine is generally long in the axial direction of the hydraulic cylinder and is positioned at a substantially right angle to the rebar to be bent, and the rebar is placed between the first receiving member and the second receiving member. By rotating the rotating arm in the inserted state, the bending member bends the reinforcing bar along the first receiving member.

[0003]

By the way, when bending a reinforcing bar protruding from a concrete structure using such a portable hydraulic rebar bending machine, the bending machine main body including the hydraulic cylinder is made substantially parallel to the concrete surface. With a posture that
The reinforcing bar protruding almost vertically from the concrete surface will be bent, but the reinforcing bar of the concrete structure is buried to strengthen the tensile stress of the concrete. Since it is often installed along the line, the bending machine body may interfere with the formwork when bending the reinforcing bar from the root, and the bending process must be performed from the side opposite to the formwork. There is a problem that the bending direction of the reinforcing bar is restricted. Such a problem similarly occurs due to the interference between the bending machine main body including the hydraulic cylinder and other reinforcing bars even when a large number of reinforcing bars protrude relatively close to each other.

The present invention has been made in view of the above circumstances, and its purpose is to solve the problem even when a plurality of rebars are proximate to each other or a form is nearby. It is to be able to bend the reinforcing bar in a desired direction without interference.

[0005]

In order to achieve the above object, the present invention provides: (a) a hydraulic cylinder for linearly moving a piston by hydraulic pressure; and (b) a position offset from the axial center of the hydraulic cylinder. A rotary shaft disposed at a right angle to the axis of the hydraulic cylinder; and (c) a rotary shaft disposed between the rotary shaft and the piston and adapted to move linearly with the piston. A rotation mechanism that rotates about an axis; (d) a rotation arm that is provided on the rotation shaft so as to project in the radial direction and that is rotated integrally with the rotation shaft; A first receiving member disposed integrally with the hydraulic cylinder at substantially the same position as the rotating shaft;
(F) It is arranged at the tip side portion of the rotating arm and is positioned on the opposite side of the first receiving member with the reinforcing bar to be bent interposed therebetween, and the reinforcing bar is rotated with the rotation of the rotating arm. (G) on the side opposite to the first receiving member with the reinforcing bar sandwiched therebetween and on the side opposite to the bending member with the first receiving member sandwiched in the longitudinal direction of the reinforcing bar. The rotating cylinder having a second receiving member integrally arranged with the hydraulic cylinder, and a reinforcing bar protruding from a concrete structure being inserted between the first receiving member and the second receiving member. In a portable hydraulic rebar bending machine, which bends the rebar by the bending member along the first receiving member by rotating the arm,
(H) The second receiving member is arranged closer to the tip side than the first receiving member in the axial direction of the hydraulic cylinder, and (i) the axial center of the hydraulic cylinder is substantially parallel to the reinforcing bar to be bent. In such a posture, the arrangement position of the first receiving member is determined so that the first receiving member is located on the opposite side of the second receiving member with the reinforcing bar interposed therebetween.
Moreover, the initial position of the rotating arm is determined so that the bending member is located on the same side as the second receiving member.

Here, as the rotating mechanism, for example, a rack that is linearly movable is provided with a rack, a pinion is attached to the rotating shaft, and the rotating shaft is rotated by meshing with them. However, (j) a notch provided in the piston or a member that is linearly moved integrally with the piston in a direction substantially perpendicular to the axial center of the hydraulic cylinder in a plane perpendicular to the rotation axis. And (k) a lever provided on the rotating shaft so as to project in the radial direction, and (l) an engaging pin which is arranged on the lever in parallel with the rotating shaft and engages with the notch. It is also possible to include it. Along the linear movement of the piston, a notch may be provided on the lever side in the radial direction of the rotating shaft, and an engaging pin that engages with the notch may be arranged on the piston side in parallel with the rotating shaft. It is also possible to employ various other means capable of rotating the rotating shaft.

[0007]

In such a portable hydraulic rebar bending machine, the second receiving member is arranged at the tip end side in the axial direction of the hydraulic cylinder, and the axial center of the hydraulic cylinder is bent. Since bending work can be performed in a posture that is substantially parallel to the power rebar, by bending the tip of the bending machine body including the hydraulic cylinder into contact with the concrete surface, the rebar protruding from the concrete surface can be removed. In addition to being able to bend from the root, even when a plurality of reinforcing bars project in close proximity to each other or when a formwork exists nearby, the reinforcing bars can be bent in a desired direction without interfering with them.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 to 3 show a bending process of a reinforcing bar 4 protruding upward from a concrete structure 2 using a portable hydraulic rebar bending machine 10 (hereinafter, simply referred to as a reinforcing bar bending machine 10) according to an embodiment of the present invention. Fig. 1 shows the state.
Is a front view, FIG. 2 is a right side view, and FIG. 3 is a plan view of FIG. The rebar bending machine 10 has a pump driving electric motor 16 that is turned on only while a grip portion 12 and a switch 14 provided on the grip portion 12 are pushed.
A first housing 20 accommodating a gear mechanism for transmitting the rotational force of the electric motor 16 and a tank 18 attached thereto; and a second housing accommodating a hydraulic pump and valves.
Housing 22, hydraulic cylinder 24, bending head 2
6 and 6 are integrally provided.

FIG. 4 shows the first housing 20 and the second housing 20 when the reinforcing bar bending machine 10 is tilted rightward in FIG.
4 is a vertical cross-sectional view of the housing 22. As is apparent from FIG. 4, rotations of the output shaft 28 of the electric motor 16 are transmitted through the gears 30 and 32 into the housings 20 and 22. The shaft 34 is rotatably held, and the pump chamber 3 extends in a direction orthogonal to the rotation shaft 34.
6 is provided and the plunger 40 of the hydraulic pump 38 is fitted so as to be movable in the axial direction. The plunger 40 is constantly urged toward the rotary shaft 34 by a compression coil spring 44 that is inserted between the plunger 40 and the plug 42 that forms the pump chamber 36, and the eccentric cam 46 provided on the rotary shaft 34 has a needle bearing 48. The rotary shaft 34 is rotationally driven by the electric motor 16 so that the rotary shaft 34 is reciprocated in the axial direction to increase or decrease the volume of the pump chamber 36. The pump chamber 36 allows the inflow of the working oil into the pump chamber 36, but flows out, as is apparent from FIG. 5 showing the cross section of the second housing 22 and FIG. 6 showing the VI-VI cross section of FIG. Is communicated with the intake oil passage 52 via a check valve 50 that blocks the check valve 54, while a check valve 54 that allows the hydraulic oil to flow out of the pump chamber 36 but blocks the flow of the hydraulic oil.
Is communicated with the discharge oil passage 56 via the suction passage, and the working oil is sucked from the suction oil passage 52 and discharged to the discharge oil passage 56 as the volume of the plunger 40 reciprocates.

The intake oil passage 52 is opened to an oil storage chamber 58 shown in FIG. 4, and the oil storage chamber 58 is connected to the tank 18 via an oil passage 60.
The tank 18 has a bottomed cylindrical metal housing 62 whose opening is screwed into the first housing 20, and is accommodated in the housing 62 and the opening is fixed to the inner wall surface of the housing 62 by a seal ring 64. And a bottomed cylindrical rubber tank 66. The oil storage chamber 58 is communicated with the rubber tank 66. The rubber tank 66 is filled with hydraulic oil, and is expanded and contracted according to the amount of the oil. The housing 62 has a ventilation hole 68 for communicating the inside with the atmosphere.

On the other hand, the discharge oil passage 56 is shown in FIG.
VII-VII cross section switching valve 7 shown in FIG.
It is communicated with the valve chamber 72 of 0. Valve chamber 72
Is a diagram in which an opening of a bottomed circular hole formed in the second housing 22 is closed by a plug 74, and the discharge oil passage 56
Is opened at the lower end of the valve chamber 72, that is, at the end on the plug 74 side. A main valve body 76 is fitted in the valve chamber 72 so as to be slidable in the axial direction. The main valve body 76 is constantly urged toward the plug 74 by a compression coil spring 78. A circular hole 80 with a bottom is formed in the main valve body 76 from the end on the side of the plug 74.
A small valve hole is formed at the bottom of 0, and a needle valve type auxiliary valve element 84 is disposed so as to be movable in the axial direction. The auxiliary valve body 84 is always urged by a compression coil spring 86 inserted between the auxiliary valve body 82 and the plug 74 in a direction opposite to the plug 74, that is, in a direction to protrude from the main valve body 76. The protrusion provided on the bottom of the circular hole 80 is prevented from projecting by a predetermined amount or more. The spring force of the compression coil spring 86 is sufficiently weaker than that of the compression coil spring 78, and the main valve body 76 is actuated via the auxiliary valve body 84.
6 is always moved to the plug 74 side against the urging force of No. 6 and is fitted to the protruding shaft 82. An oil supply / discharge passage 8 communicating with the hydraulic cylinder 24 is provided at an intermediate portion of the valve chamber 72.
8 is opened, and a discharge oil passage 90 communicating with the oil storage chamber 58 is opened at an end opposite to the plug 74, and a plurality of passages are formed in a cylindrical portion of the main valve body 76. An oil hole 92 is provided. The sub-valve element 84 includes the plug 7
4 is moved in the opposite direction to the discharge oil passage 90.
, And closes the discharge oil passage 90. Note that FIG. 5 shows V- in FIG.
It is a figure corresponding to a V cross section.

The switching valve 70 configured as described above is
When the hydraulic pump 38 is operated by the electric motor 16 to supply hydraulic oil from the discharge oil passage 56 into the valve chamber 72, the hydraulic pressure causes the main valve body 76 to resist the urging force of the compression coil spring 78. The auxiliary valve element 8 is moved in a direction away from the plug 74, and as shown in FIG.
4 closes the opening of the discharge oil passage 90 in accordance with the urging force of the compression coil spring 86, and moves the main valve body 76 to a position where the protruding shaft 82 relatively comes out of the circular hole 80. Crevice with circular hole 80 and oil passage hole 9
The discharge oil passage 56 is communicated with the supply / discharge oil passage 88 via the second passage 2. As a result, the hydraulic oil pumped from the hydraulic pump 38 is supplied to the hydraulic cylinder 24. When the electric motor 16 is stopped and the hydraulic oil is no longer supplied from the hydraulic pump 38, the main valve body 76 is moved to the plug 74 side according to the biasing force of the compression coil spring 78, as shown in FIG. As described above, the protruding shaft 82 is relatively fitted in the circular hole 80 of the main valve body 76, and the auxiliary valve body 84 resists the biasing force of the compression coil spring 86 as the main valve body 76 moves. Then, the discharge oil passage 90 is separated from the opening, and the discharge oil passage 90 and the supply / discharge oil passage 88 communicate with each other. This allows the working oil in the hydraulic cylinder 24 to return to the oil storage chamber 58 and further to the tank 18 via the supply / discharge oil passage 88 and the discharge oil passage 90. In addition, circular hole 8
A predetermined gap is provided between the inner peripheral surface of the shaft 0 and the outer peripheral surface of the protruding shaft 82, and the main valve body 76 can be returned to a position where the main valve body 76 abuts on the plug 74 by flowing hydraulic oil through the clearance. It has become.

A relief valve 94 is provided in the second housing 22 and is connected to a supply / discharge oil passage 88 via a branch oil passage 96. This relief valve 94
Is provided with a relief valve 100 which always closes the opening of the branch oil passage 96 by a compression coil spring 98. When the oil pressure in the supply / discharge oil passage 88 becomes higher than necessary, the relief valve 100 is provided. Is pushed back against the urging force of the compression coil spring 98, thereby opening the opening of the branch oil passage 96 and discharging the hydraulic oil in the supply / discharge oil passage 88 to the discharge oil passage 102.
From the oil storage chamber 58.

On the other hand, the hydraulic cylinder 24 and the bending head 26 are a vertical sectional view as seen from the front, FIG. 10 as a partial vertical sectional view as seen from the right, and a bottom view in FIG. And the hydraulic cylinder 24
The three bolts 110 allow the second housing 2 to
A cylinder tube 112 fixed to the end surface of the second cylinder 2 and a piston 114 slidably fitted in the cylinder tube 112 are provided. The cylinder tube 112 has a bottomed cylindrical shape, is fixed to the second housing 22 on the bottom portion 116 side, and the bottom portion 116 has an additional member formed between the piston 114 and the bottom portion 116. A communication hole 120 for communicating the pressure chamber 118 with the oil supply / discharge passage 88 is provided. Cylinder tube 11
A male screw is provided on the outer circumferential surface of the opening 2 of the bending head 26, and the main body block 124 of the bending head 26 is screwed into the outer circumference of the bending head 26, and the lock nut 126 is tightened at a desired rotation position so as to be integrally fixed. The body block 124 has an insertion hole 128 formed concentrically with the cylinder tube 112, and the rack 13 integrally formed with the piston 114.
0 is slidably inserted, and a compression coil spring 132 inserted between the insertion hole 128 and the piston 114 is abutted around the insertion hole 128. Therefore, when the hydraulic oil is supplied into the pressurizing chamber 118, the piston 114 is moved in the direction of protruding the rack 130 downward, while the operation of the hydraulic pump 38 is stopped, and the hydraulic pressure of the hydraulic oil is lowered. Then, piston 1
14 is pushed back to the bottom 116 side while pushing out the hydraulic oil in the pressurizing chamber 118 from the communication hole 120 according to the urging force of the compression coil spring 132. When the hydraulic pump 38 is stopped, the switching valve 70 is switched and the oil supply / drain passage 88
And the discharge oil passage 90 are connected, the pressure chamber 118
The hydraulic oil inside can be pushed out. The movement stroke of the piston 114 is determined by the body block 124.
It is defined by the tip of the rack 130 coming into contact with the stopper 134 screwed in. FIG. 12 is a circuit diagram of a hydraulic circuit provided in the reinforcing bar bending machine 10 according to the present embodiment, in which the switching valve 70 is located at an operating position connecting the discharge oil passage 56 and the supply / discharge oil passage 88. Is in a state of being.

In the main body block 124, a rotary shaft 136 is arranged at a position offset from the shaft center of the hydraulic cylinder 24 at a right angle to the shaft center.
A pinion 138 that meshes with the rack 130 is attached to the unit 36 via a pair of keys 140 so as not to rotate relative to each other. The rotating shaft 136 is rotatably supported by the main body block 124 around the shaft center through a pair of wear-resistant oilless bushes 142 and 144, and is also pulled out to the left in FIG. 10 by the stopper 146. And the pinion 138 is rotatably positioned in the accommodation hole 148 formed in the body block 124. Further, the diameter of the pinion 138 is moved counterclockwise in FIG. 9 by being moved from the return position where the piston 114 of the hydraulic cylinder 24 abuts the bottom 116 to the protruding position where the tip of the rack 130 abuts the stopper 134. It is designed to be rotated by 90 °, and the exact rotation angle can be adjusted by the screwing amount of the stopper 134. The rotation angle of the rotation shaft 136 is determined according to the thickness and bending angle of the reinforcing bar 4.
The back of the rack 130 is brought into sliding contact with the main body block 124 to prevent escape from the pinion 138, and the main body block 124 is provided with a grease reservoir 149 for accommodating grease for lubricating the space with the rack 130. Has been done. The opening of the accommodation hole 148 is closed by a cover 150. In this embodiment, the rack 130 and the pinion 138 form a rotating mechanism.

One end of the rotary shaft 136, that is, the end opposite to the side where the stopper 146 is provided projects from the main body block 124 to the outside, and the rotary arm 152.
Are attached via a pair of keys 154 such that they cannot rotate relative to each other. At the tip of the rotating arm 152, the rotating shaft 13
The shaft 156 is parallel to the axis of
Is fixed so as to project to the opposite side, and its shaft 156 has an oilless bush 15 having wear resistance.
The roller 160 is rotatably arranged via the roller 8, and the roller 160 is prevented from coming off the shaft 156 by a stopper 162. The disposing position of the rotating arm 152 around the rotating shaft 136 is set to an initial position in which the piston 114 is projected in the upper right direction as shown by a solid line in FIG. 1 when the piston 114 is held at the return position. Specified, piston 11
When 4 is moved to the projecting position, it is rotated about 90 ° counterclockwise as shown by the chain line. The roller 160 corresponds to a bending member.

A ring member 164 is rotatably disposed on the outer side of the rotating arm 152 at one end of the rotating shaft 136. The ring member 164 functions as a first receiving member, is made of a wear-resistant member such as the inner ring of the needle bearing, and
As shown in FIG. 1, when the hydraulic cylinder 24 has a posture in which the axis of the hydraulic cylinder 24 is substantially parallel to the reinforcing bar 4 to be bent, and the rotating arm 152 is held at the initial position, the gap between the roller 160 and the roller 160 is small. The rebar 4 can be positioned at the position, and the revolving arm 152 is rotated counterclockwise from this state so that the rebar 4 is bent about 90 ° along the outer peripheral surface of the ring member 164. Ring member 164
Is fitted in a small-diameter portion provided at the end of the rotating shaft 136, and is prevented from coming off the rotating shaft 136 by a stopper 166. Is equipped with a thrust washer 168. Further, a grease hole 170 is provided in the small diameter portion of the rotating shaft 136, and grease for lubricating the outer peripheral surface of the rotating shaft 136 and the ring member 164 is filled with the grease.

A positioning block 172 is fixedly provided on the front side of the tip portion of the body block 124, that is, on the left side surface of the lower end portion in FIG. 10, so that the tip surface substantially coincides with the tip surface of the body block 124. . The positioning block 172 is the engaging portion 1 that functions as a second receiving member.
74, the engaging portion 174 is in a posture in which the axis of the hydraulic cylinder 24 is substantially parallel to the reinforcing bar 4 to be bent as shown in FIG.
Is held at the initial position, and when the reinforcing bar 4 is inserted between the ring member 164 and the roller 160, it is positioned closer to the roller 160 than the reinforcing bar 4. By engaging the engaging portion 174 and the reinforcing bar 4, a reaction force due to bending of the reinforcing bar 4 by the roller 160 and the ring member 164 is received,
The main body portion including the hydraulic cylinder 24 of the reinforcing bar bending machine 10 is prevented from rotating around the rotating shaft 136 with respect to the rotating arm 152.

Next, the operation of the reinforcing bar bending machine 10 constructed as above will be described.

For example, when bending the reinforcing bar 4 protruding upward from the concrete structure 2 from the root portion as shown in FIGS. 1 to 3, first, the hydraulic cylinder 24 is used.
The reinforcing bar bending machine 10 is placed substantially vertically such that the tip end surface of the bending head 26 is in close contact with the surface of the concrete structure 2 such that the axis center of the is substantially parallel to the axis center of the reinforcing bar 4. Further, the state in which the rotating arm 152 is held at the initial position, that is, the switch 14 is released, the piston 114 of the hydraulic cylinder 24 is released.
In the state of returning to the return position, the position of the reinforcing bar bending machine 10 is adjusted so that the reinforcing bar 4 can be inserted between the ring member 164, the roller 160 and the engaging portion 174. The posture around the axis of the reinforcing bar bending machine 10 may be determined according to the bending direction of the reinforcing bar 4, and FIGS. 1 to 3 show the case where the reinforcing bar 4 is bent to the side opposite to the formwork 6 of the concrete structure 2. .
Bending head 26 around the axis of the hydraulic cylinder 24
Since the posture of can be adjusted by loosening the lock nut 126, the height of the mold 6 is relatively low and the tank 18
If the grip portion 12 and the mold 6 do not interfere with each other, the posture of the bending head 26 with respect to the hydraulic cylinder 24 may be changed so that the tank 18 and the grip portion 12 are on the mold 6 side. it can. The piston 114 of the hydraulic cylinder 24 is rotated around the axis center integrally with the bending head 26 by the engagement of the rack 130 and the pinion 138.

When the switch 14 is pushed in this state, the electric motor 16 is operated, the hydraulic oil is pumped to the switching valve 70 by the hydraulic pump 38, and the hydraulic pressure of the hydraulic oil causes the switching valve 70 to discharge the discharge oil passage 56. And the oil supply / exhaust passage 88 are communicated with each other and the communication between the oil supply / exhaust passage 88 and the oil discharge passage 90 is switched off, and the hydraulic fluid pumped from the hydraulic pump 38 is pressurized by the pressurizing chamber 118 of the hydraulic cylinder 24. Flows in. As a result, the hydraulic cylinder 24
The rack 130 integrally provided with the piston 114 of the above is projected downward, and together with the pinion 138, the rotation shaft 136 ,.
When the rotating arm 152 is rotated counterclockwise in FIG. 1, the roller 160 comes into contact with the rebar 4 and the rebar 4
Is bent along the ring member 164. The reaction force at this time is received by the engagement between the engaging portion 174 of the positioning block 172 fixed to the main body block 124 and the reinforcing bar 4.

When the pushing operation of the switch 14 is released after the bending work of the reinforcing bar 4 is finished, the operation of the electric motor 16 is stopped and the hydraulic oil is not supplied from the hydraulic pump 38 to the switching valve 70, the discharge oil passage 90 is formed. Since the supply / discharge oil passage 88 is communicated, the piston 114 of the hydraulic cylinder 24 is pushed back according to the biasing force of the compression coil spring 132, and the working oil in the pressurizing chamber 118 is supplied / exhausted.
And the oil storage chamber 58 via the discharge oil passage 90, and further the tank 1
Returned to 8 As a result, the rotating arm 152 is
Is rotated clockwise to return to the initial position shown by the solid line. The pull-back operation of the piston 114, that is, the return operation of the rotating arm 152 can be performed at any time by releasing the pushing operation of the switch 14, and the operator visually confirms the bent state of the reinforcing bar 4 and arbitrarily bends it. The bending process can be finished at an angle. In addition, the piston 114 reaches the protruding position and the rack 130 is reached.
When the push-in operation of the switch 14 is continued even after the contact with the stopper 134, the relief valve 94 is opened by the increase of the hydraulic pressure, and the hydraulic oil supplied from the hydraulic pump 38 is discharged from the branch oil passage 96. It is returned to the tank 18 via the oil passage 102.

Here, the reinforcing bar bending machine 10 of the present embodiment will be described.
Is provided with a positioning block 172 having an engaging portion 174 at the tip of the bending head 26, and performs bending in a posture in which the axis of the hydraulic cylinder 24 is substantially parallel to the reinforcing bar 4 to be bent. As a result, the reinforcing bar 4 protruding from the concrete structure 2 can be bent from the root, and even when a plurality of reinforcing bars 4 are protruding close to each other or when the formwork 6 is present nearby, the reinforcing bar bending machine can be used. The reinforcing bar 4 can be bent in a desired direction without the 10 interfering with them. For example, bending can be performed even when the distance from the formwork 6 to the reinforcing bar 4 is about 5 to 10 cm, and the reinforcing bar 4 can be bent at a height position of about 5 to 6 cm from the concrete structure 2. You can do it.

Further, in this embodiment, as apparent from FIG. 3, the bending position of the reinforcing bar 4 is offset with respect to the grip portion 12 in a plan view, so that the plurality of reinforcing bars 4 are formed in the form as shown in FIG. 6, even if existing along the 6, the grip portion 12 or the like can be bent without interfering with other reinforcing bars 4, and the bending order of the reinforcing bars 4 is not particularly limited. It can be bent from the left side or the left side.

Further, since the bending head 26 of this embodiment is screwed to the hydraulic cylinder 24, the reinforcing bar bending machine 10 is compact as compared with the case where both are integrally connected using a large number of bolts. It is also lightweight. In other words, between these bending heads 26 and the hydraulic cylinders 24, a reaction force having substantially the same magnitude as the thrust of the piston 114, specifically, a direction in which a large force required for bending the reinforcing bar 4 is separated from each other. Therefore, it is necessary to dispose a large number of bolts around the entire circumference of the cylinder tube 112 when using bolts for connection. Since the posture of the bending head 26 around the axis of the hydraulic cylinder 24 can be arbitrarily set by loosening the lock nut 126, there is also an advantage that the bending work of the reinforcing bar becomes easier.

Further, in the present embodiment, the single-acting hydraulic cylinder 24 is used, and the switching valve 70 which is switched depending on the supply state of the hydraulic oil from the hydraulic pump 38 is adopted, and the rack 13 is pushed by pushing the switch 14.
While 0 is projected, the rack 130 is pulled in by releasing the pushing operation, so that, for example, the hydraulic pump 38
It is easier to operate compared to the one that requires switching operation of switch stop and valve switching with switches etc.
Particularly, in the portable rebar bending machine 10 as in this embodiment, the burden on the operator is greatly reduced and the work efficiency is improved. Further, in the present embodiment, the rack 130 can be returned at any time simply by releasing the pushing of the switch 14. Therefore, for example, even when an obstacle is found during the bending process of the reinforcing bar 4, the rack can be easily and promptly. Bending can be stopped by retracting 130.

Next, another embodiment of the present invention will be described. In the following embodiments, the same parts as those in the first embodiment will be designated by the same reference numerals and detailed description thereof will be omitted.

In the embodiment shown in FIGS. 13 to 15, the cylinder tube 112 and the main body block 124 are fitted so as to be movable relative to each other without being screwed, and the cross-sections in the fitted state are Annular grooves 180, 18 having a semi-circular cross section to form a circular annular passage
2 are provided respectively, and a wire 184 such as a piano wire is inserted through the annular passage to connect the main body block 124 to the cylinder tube 112 so as not to be detachable in the axial direction and relatively rotatable about the axis. The annular groove 182 is formed in the fitting cylindrical portion 186 of the body block 124.
A notch 188 that is long in the circumferential direction is formed so that the wire 184 is inserted into the annular passage from the notch 188, and both ends are bent so that both ends of the notch 188 in the circumferential direction are bent. It is locked. In this case, the posture of the bending head 26 around the axis of the hydraulic cylinder 24 can be easily changed according to working conditions and the like, and workability in bending the reinforcing bar 4 is further improved. 14 is a left side view showing the cutout 188, and FIG. 15 is a view showing a cross section XV-XV in FIG.

Next, another embodiment of the present invention will be described with reference to FIG.
Through FIG. This embodiment is an example in which the rotating mechanism and the hydraulic cylinder are different from those of the above-described embodiments, and the hydraulic cylinder 24 and the bending head 26 are replaced with a hydraulic unit from the grip portion 12 to the second housing 22. It is attached and used.
FIG. 16 shows a bending head 200 and a hydraulic cylinder 202.
17 and the like, and FIG. 17 is a longitudinal sectional view of the same viewed from the same direction as FIG. The hydraulic cylinder 202 is the second
A cylinder tube 204 having a bottomed cylindrical shape fixed to an end surface of the housing 22 and a long rod-shaped piston 206 having one end slidably fitted in the cylinder tube 204 are provided. The outer peripheral surface of 206 has a liquid-tight seal with the cylinder tube 204.
A ring 205 is provided. Cylinder tube 20
4 has a bottom portion 208 and a piston 206.
A communication hole 212 for communicating the pressurizing chamber 210 formed between and with the oil supply / discharge oil passage 88 is provided. Further, a hole 207 for taking a meat hole is formed in the central portion of the shaft of the piston 206 so as to open to the side of the pressurizing chamber 210, so that the weight can be reduced. The cylinder tube 204 is the bending head 2
00, the inner side of the intermediate sleeve 214 is fitted to the inner side of the intermediate sleeve 214, and the outer and inner peripheral surfaces of both of the inner and outer surfaces which are in contact with each other have the semicircular annular groove 21 as in the case of the second embodiment.
6 and 218 are provided, respectively, and the wire 220 is inserted into the annular grooves 216 and 218, respectively, so that one end of the intermediate sleeve 214 is relatively rotatable around the axis and is not detachable in the axial direction. Has been done. The other end of the intermediate sleeve 214 has the bending head 200.
The main body block 222 is screwed together and is tightened by the lock nut 224 to be integrally connected to the main body block 222.

As shown in FIG. 17, one end portion of the piston 206, that is, the upper end portion in the figure, is the cylinder tube 2.
04 in the return position in which it abuts the bottom portion 208, the portion of the piston 206 that is not housed in the cylinder tube 204, in other words, the cylinder tube 2
The piston 2 is located at a position axially downward from 04.
A washer 226 having a diameter larger than 06 is arranged in a state in which the stop ring 228 prevents the washer 226 from moving toward the cylinder tube 204 side, and the piston 206 and the intermediate sleeve 214 are provided.
Compression coil spring 2 arranged in a cylindrical space between
One end of 30 is brought into contact with the lower surface of the washer 226. The cylinder tube 20 is attached to the body block 222.
4 and the like, an insertion hole 232 is formed concentrically with the piston 206.
The other end of the compression coil spring 230 is slidably inserted, and the other end of the compression coil spring 230 is in contact with the periphery of the insertion hole 232 on the side of the intermediate sleeve 214. The spring 230 causes the piston 206 to pass through the washer 226 and the retaining ring 228.
Is urged toward the bottom portion 208. Therefore, when the hydraulic pump 38 is driven and hydraulic oil is supplied into the pressurizing chamber 210, the piston 206 resists the biasing force of the compression coil spring 230 in the direction in which the other end thereof further projects into the main body block 222. On the other hand, when the hydraulic pump 38 is stopped and the hydraulic pressure of the hydraulic oil decreases, the piston 206 moves the compression coil spring 230.
The hydraulic oil in the pressurizing chamber 210 according to the urging force of
While being pushed out from 2, it is pushed back to the bottom portion 208 side. The moving end when the piston 206 is projected is determined by the tip of the other end of the piston 206 coming into contact with a stopper 234 provided by being screwed in the moving direction of the piston 206 at the lower end of the main body block 222. Stipulated.

In the main body block 222, a rotary shaft 236 is rotatably arranged at a position offset rightward from the axis of the hydraulic cylinder 202 in FIG. 17 at a right angle to the axis of the hydraulic cylinder 202. Along with
An accommodation hole 260 is formed so as to be orthogonal to the insertion hole 232. In the accommodation hole 260, a lever 238 is provided so as to be projected in the radial direction on the rotary shaft 236 via a pair of keys 240 so as not to be rotatable relative to the rotary shaft 236, and the rotary shaft is provided on the tip side of the projected lever 238. Two
An engagement pin 242 is provided in parallel with 36. on the other hand,
The other end of the piston 206 has a notch having a predetermined width in a plane substantially perpendicular to the rotation shaft 236, that is, in the rotation plane of the engagement pin 242 in a direction substantially perpendicular to the axis of the hydraulic cylinder 202. 244 is provided, and the cutout 2 is provided.
The engagement pin 242 is engaged with 44. FIG. 1 shows a cross section parallel to the rotation shaft 236 and the engagement pin 242.
As can be seen from FIG. 8, the engagement pin 242 is rotatable relative to the lever 238 by supporting both ends of the engagement pin 242 via the pair of oilless bushes 246, and is chamfered in parallel with the shaft center. The processed contact surface 248 is always engaged with the one end surface of the notch 244 in a surface contact state regardless of the rotational position of the lever 238. Further, the other end of the piston 206 is double-chamfered in parallel with the rotation plane of the engagement pin 242.
By engaging the inside of the saddle-shaped portion of No. 8, the lever 238
The relative rotation of the piston 206 about the axis is prevented.

Further, in FIG. 18, the rotating shaft 236 is supported by a pair of oilless bushes 264 and 266 so as to be rotatable around its axis, and the lever 238 is accommodated in the housing hole 260 of the main body block 222. The lever 238 is brought into contact with the large-diameter side step portion of the rotating shaft 236, and the stopper 268 is integrally provided at the small-diameter side end portion of the rotating shaft 236, so that the main body block 2
By being brought into contact with 22, the movement of the rotary shaft 236 in the axial direction is prevented. Note that FIG. 18 shows a cross section when the lever 238 rotates until it takes a posture perpendicular to the axis of the piston 206. Returning to FIG. 17, the outer peripheral portion of the other end of the piston 206 opposite to the rotary shaft 236 is slidably contacted with the arc-shaped guide surface 250 of the main body block 222, and A plug screw 252 is screwed from the outer peripheral side into a female screw hole formed so as to penetrate the side wall and open to the guide surface 250, whereby a grease reservoir 254 containing grease for lubricating the piston 206 is formed. Has been formed. The stopper 234 is positioned at a desired adjustment position by pressing a brass pressing piece 256 with a set screw 258 from a direction perpendicular to the axis. The opening of the accommodation hole 260 is closed by the cover 262.

The lever 238, the engaging pin 242, and the notch 244 constitute a rotating mechanism, and when the piston 206 of the hydraulic cylinder 202 is moved from the return position to the protruding position where it abuts against the stopper 234, The engagement pin 242 is in sliding contact with the inside of the notch 244, and the piston 2
The lever 238 and the rotating shaft 236 are pushed around in the protruding direction of 06, and the lever 238 and the rotating shaft 236 are rotated about 85 degrees counterclockwise from the state shown in FIG.
Can be rotated by °. The accurate rotation angle in this case can be adjusted by the screwing amount of the stopper 234, and is determined according to the bending condition of the reinforcing bar 4. The initial rotation position of the lever 238 is the main block 22 of the intermediate sleeve 214.
It is also possible to change it by adjusting the screwing amount with respect to 2.

FIG. 19 shows the bending head 200 shown in FIG.
3 is a partial cross-sectional view of the rotary shaft 236 on the large diameter side, that is, on the side opposite to the side where the stopper 268 is provided, the rotary arm 270 is integrated with the rotary shaft 236 so as to project in the radial direction. Installed in place. Swivel arm 2
70 is provided with a quadrangular prism-shaped projection 272, while a corresponding large-diameter side end surface of the rotary shaft 236 is provided with a corresponding square-hole-shaped fitting concave portion 274, which is rotated by fitting them. The moving shaft 236 and the rotating arm 270 are relatively unrotatable. At the tip of the rotating arm 270,
A shaft 276 is erected in parallel with the axis of the rotating shaft 236 so as to project to the side opposite to the main body block 222,
Like the roller 160, a roller 278 corresponding to a bending member is rotatably disposed on the shaft 276, and the roller 278 is prevented from coming off the shaft 276 by a stopper 280. The arrangement position of the rotating arm 270 around the rotating shaft 236 is
When the piston 206 is held in the return position, the initial position is such that the piston 206 protrudes in a direction inclined about 30 ° clockwise from the vertically upper side as shown in FIG. With the rotation of the, it is rotated about 85 ° counterclockwise from its initial position. Further, the grease hole 2 is opened on the outer peripheral side of the shaft 276.
82 is provided, and grease for lubricating between the outer peripheral surface thereof and the inner peripheral surface of the roller 278 is filled. It should be noted that FIG. 19 shows a cross section when the rotating arm 270 is rotated until it becomes a posture parallel to the axis of the piston 206.

At the front end of the main body block 222, that is, at the front side of the lower end in FIG. 16, the first support block 2 is provided.
86 and the second support block 288 are the main body block 22.
It is integrally fixed to 2. First support block 286
Is slightly deviated from the axis of the rotating shaft 236 toward the axis of the hydraulic cylinder 202, but is provided at substantially the same position as the rotating shaft 236 and functions as a first receiving member. The column portion 285 has a lower end surface that substantially coincides with the front end surface of the main body block 222. On the other hand, as is apparent from FIG. 18 and the like, the second support block 288 has an engaging portion 290 that functions as a second receiving member having a shape similar to that of the engaging portion 174 of the positioning block 172, and the first supporting block 288 described above. The support block 286 is integrally joined by welding in a state intersecting the support block 286 at a right angle, and is attached to the front surface of the main body block 222 by a bolt.

The guide portion 284 of the first support block 286.
Has a semi-circular curved surface shape having an axis parallel to the rotating shaft 236, and has wear resistance on its outer peripheral surface. This guide portion 284 is similar to the ring member 164 in the above-described embodiment in that the reinforcing bar 4 to be bent is formed.
With respect to the hydraulic cylinder 202, the axial center of the hydraulic cylinder 202 is substantially parallel to the hydraulic cylinder 202, and the reinforcing bar 4 can be positioned between the roller 278 and the rotary arm 270 in the initial position. When the rotating arm 270 rotates counterclockwise in FIG. 16, the reinforcing bar 4 is guided by the guide portion 284.
It is bent about 90 ° along the outer peripheral surface of the. Further, the lower end surface of the column portion 285 contacts the surface of the concrete structure 2 to support a downward load applied to the guide portion 284 during the bending process.

The engaging portion 290 of the second support block 288
Is in a posture in which the axis of the hydraulic cylinder 202 is substantially parallel to the rebar 4 to be bent, and the rotating arm 27 is
0 is held at the initial position and the first support block 2
When the reinforcing bar 4 is inserted between the guide portion 284 of 86 and the roller 278, the reinforcing bar 4 is positioned on the same side as the roller 278 with respect to the reinforcing bar 4. By engaging the engaging portion 290 and the reinforcing bar 4, a reaction force caused by the bending process of the reinforcing bar 4 by the roller 278 and the guide portion 284 is received, and the main body portion of the reinforcing bar bending machine including the hydraulic cylinder 202 rotates. Rotation around the rotation shaft 236 with respect to the moving arm 270 is prevented.

The operation of this embodiment is shown in FIG.
As shown in FIG. 5, the entire apparatus is placed on the concrete structure 2 such that the axis of the hydraulic cylinder 202 is substantially parallel to the reinforcing bar 4, and the intermediate sleeve 214 and below are rotated relative to the hydraulic cylinder 202. 1st
The posture of the bending head 200 is adjusted so that the reinforcing bar 4 can be inserted between the guide portion 284 of the support block 286 and the roller 278 and the engagement portion 290 of the second support block 288. Then, when hydraulic oil is supplied to the pressurizing chamber 210 in the hydraulic cylinder 202 by the pushing operation of the switch 14 by the hydraulic pump 38, the piston 206 is projected into the main body block 222 and the lever 238 is pushed through the engaging pin 242. 17 is rotated counterclockwise in FIG. 17, and at the same time, the rotation shaft 236 and the rotation arm 270 are also rotated counterclockwise in FIG. As a result, the roller 278 is in contact with the reinforcing bar 4 and bends the reinforcing bar 4 along the guide portion 284. The reaction force at this time is received by the engagement between the engaging portion 290 of the second support block 288 fixed to the main body block 222 and the reinforcing bar 4. When the pushing operation of the switch 14 is released after the bending of the reinforcing bar 4 is completed, the piston 206 is pulled toward the bottom portion 208 side of the cylinder tube 204 according to the biasing force of the compression coil spring 230, and the lever 238 and the rotating arm 270 move. It is rotated in the opposite direction and returned to the initial position.

According to the present embodiment, similarly to the above-described embodiments, the bending can be performed in a posture in which the axis of the hydraulic cylinder 202 is substantially parallel to the reinforcing bar 4, and the bending machine main body is made into the concrete structure 2. By erecting on the surface of, the reinforcing bars 4 protruding vertically from the surface can be bent from the root without interfering with obstacles in the vicinity. In addition, in this embodiment, the lever 238, the engagement pin 242,
Since the notch 244 and the rotating mechanism constitute the rotating mechanism, the durability is superior to the rotating mechanism including the rack 130 and the pinion 138. Further, since the piston 206 has a simple structure with the notch 244,
It is easy to process and assemble / disassemble as a whole, and it is relatively inexpensive and easy to maintain. further,
Since the intermediate sleeve 214 that is rotatable with respect to the hydraulic cylinder 202 is provided, there is an advantage that operations such as positioning with respect to the reinforcing bar 4 are facilitated.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the present invention can be implemented in other modes.

For example, in the above embodiment, the rollers 160, 2
78 and the ring member 164 were rotatably arranged, respectively.
6, 276 or the rotation arms 152, 270 may be non-rotatably arranged, or the ring member 164 may be non-rotatably arranged on the rotation shaft 136, and the shapes thereof and the guide portion 284 may be formed. Does not necessarily have to be cylindrical or arcuate, and can be changed as appropriate. In addition, the rollers 160, 2
78 and the ring member 164 to the rotary arms 152 and 270.
Alternatively, the rotary shafts 136 and 236 may be integrated with each other.

Further, in the above-described embodiment, the pinion 138 and the rotating arm 152 are attached to the rotating shaft 136 via the keys 140 and 154, respectively, so that they cannot rotate relative to each other, and the lever 238 and the rotating arm 270 are respectively connected to the key 240. ，
The rotation shaft 236 is provided via the protrusion 272 and the fitting recess 274.
Although they are attached so as not to rotate relative to each other, various means such as integrally forming them, press-fitting and fixing them, or utilizing splines can be adopted.

In the second and third embodiments, the wire 1 is used.
Bending head 26 and intermediate sleeve 2 by 84 and 220
Although 14 is rotatable with respect to the hydraulic cylinders 24 and 202 and cannot be pulled out, for example, the lock nut 126 is eliminated in the first embodiment, and the cylinder tube 112 and the main body block 124 are engaged with each other when rotating. Both of them can be rotated, for example, by providing a dowel pin and the like so that the main body block 124 can be rotated relative to the cylinder tube 112 in the reverse rotation direction and prevented from coming out, and can be relatively rotated within a predetermined rotation angle range. It is possible to employ various connecting means for connecting so as not to slip out. On the contrary, the intermediate sleeve 214 of the third embodiment may be omitted, and the cylinder tube 204 may be directly connected to the main body block 222 so as not to rotate relative thereto.

In the third embodiment, the piston 20
6 is provided with the notch 244 and the lever 238 is provided with the engagement pin 242, but the piston 206 may be provided with the engagement pin and the lever 238 may be provided with the notch, the elongated hole, or the like. The rotating member, with which the other end of the rotating body directly contacts, and the urging means for urging the rotating arm to the initial position may be provided instead of the lever 238 or the like.

In the above embodiment, the bending heads 26 and 2 are
Although the tip end surface of 00 is directly attached to the concrete structure 2, a bolt or the like is provided on the tip end surfaces of the bending heads 26 and 200, and the bending height position can be adjusted by the screwing amount of the bolt. It is also possible to Instead of the engaging portions 174, 290,
The screwing amount is adjusted by screwing the bolt in the left-right direction in FIG. 1 so that the first support block 286 is moved to the second support block 288 and the relative position in the left-right direction in FIG. 16 is adjusted. It is also possible to change the gap between the reinforcing bar 4 and the reinforcing bar 4 by connecting them as possible.

Further, in the switching valve 70 of the above-mentioned embodiment, the compression coil spring 86 is interposed between the sub valve body 84 and the plug 74, but it is interposed between the main valve body 76 and the sub valve body 84. It does not matter if you insert it. Other switching valves such as an electromagnetic switching valve that is switched by a switch operation can be used, and a double-acting hydraulic cylinder in which a piston is reciprocally moved by hydraulic pressure can also be used.

Although not illustrated one by one, the present invention can be implemented in variously modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a front view of a portable hydraulic rebar bending machine according to an embodiment of the present invention.

2 is a right side view of the reinforcing bar bending machine of FIG. 1. FIG.

3 is a plan view of the reinforcing bar bending machine of FIG. 2. FIG.

FIG. 4 is a partial vertical cross-sectional view showing the vicinity of the hydraulic pump in a state where the reinforcing bar bending machine in FIG. 2 is tilted to the right.

5 is a horizontal cross-sectional view of a second housing portion provided with a hydraulic pump in FIG. 4, and is a view corresponding to a VV cross section in FIG. 7.

6 is a sectional view taken along line VI-VI in FIG.

7 is a sectional view taken along line VII-VII in FIG.

8 is a cross-sectional view showing a state where the oil passage connection state of the switching valve shown in FIG. 7 is switched.

9 is a longitudinal sectional view showing a hydraulic cylinder and a bending head of the reinforcing bar bending machine of FIG.

10 is a partial cross-sectional view of the hydraulic cylinder and bending head of the reinforcing bar bending machine of FIG. 1 as viewed from the right side.

11 is a bottom view of the reinforcing bar bending machine of FIG. 1. FIG.

FIG. 12 is a hydraulic circuit diagram of the reinforcing bar bending machine of FIG. 1.

FIG. 13 is a view showing a main part of another embodiment of the present invention and is a view corresponding to FIG. 9;

FIG. 14 is a left side view showing a fitting portion in the embodiment of FIG.

15 is a sectional view taken along line XV-XV in FIG.

FIG. 16 is a front view showing a main part of still another embodiment of the present invention.

17 is a vertical sectional view showing a hydraulic cylinder and a bending head of the embodiment of FIG.

18 is a cross-sectional view showing in detail a rotating mechanism in the bending head of the embodiment of FIG.

19 is a partial cross-sectional view of the bending head of the embodiment of FIG. 16 seen from the right side.

FIG. 20 is a front view for explaining the operation when bending the reinforcing bar using the embodiment of FIG.

[Explanation of symbols]

 2: Concrete structure 4: Reinforcing bar 10: Portable hydraulic rebar bending machine 24, 202: Hydraulic cylinder 114, 206: Piston 130: Rack (rotating mechanism) 136, 236: Rotating shaft 138: Pinion (rotating mechanism) ) 152, 270: Rotating arm 160, 278: Roller (bending member) 164: Ring member (first receiving member) 174, 290: Engaging portion (second receiving member) 238: Lever (rotating mechanism) 242: Engaging pin (rotating mechanism) 244: Notch (rotating mechanism) 284: Guide portion (first receiving member)

Claims (2)

[Scope of utility model registration request] 1. A hydraulic cylinder for linearly moving a piston by hydraulic pressure, a rotary shaft disposed at a position offset from the shaft center of the hydraulic cylinder at right angles to the shaft center of the hydraulic cylinder, and the rotary shaft. A rotating mechanism disposed between the rotating shaft and the piston, the rotating mechanism rotating the rotating shaft around its axis with linear movement of the piston, and the rotating mechanism protruding in the radial direction from the rotating shaft. A rotating arm that is integrally rotated with the rotating shaft, a first receiving member that is integrally provided with the hydraulic cylinder at substantially the same position as the rotating shaft, and a tip side of the rotating arm. A bending member which is disposed on a portion of the bending member and is positioned on the opposite side of the first receiving member with the reinforcing bar to be bent interposed therebetween, and which is brought into contact with the reinforcing bar as the rotating arm rotates; On the opposite side of the first receiving member across the reinforcing bar One first in the longitudinal direction of the iron muscle
A second receiving member is provided integrally with the hydraulic cylinder on the opposite side of the bending member with the receiving member interposed therebetween, and the reinforcing bar protruding from the concrete structure is the first receiving member and the second receiving member. In the portable hydraulic rebar bending machine, wherein the revolving arm is bent along the first receiving member by rotating the revolving arm in a state of being inserted between The first receiving member is arranged in a posture in which the receiving member is arranged closer to the tip end side than the first receiving member in the axial direction of the hydraulic cylinder, and the axial center of the hydraulic cylinder is substantially parallel to the reinforcing bar to be bent. The arrangement position of the first receiving member is determined so that the member is positioned on the opposite side of the second receiving member with the reinforcing bar interposed therebetween, and the bending member is positioned on the same side as the second receiving member. To be Portable Hydraulic rebar bending machine, characterized in that the sea urchin initial position of the pivot arm is defined. 2. The rotating mechanism includes a direction substantially perpendicular to the axial center of the hydraulic cylinder in a plane perpendicular to the rotating shaft with respect to the piston or a member which is linearly moved integrally with the piston. A notch provided in the rotary shaft, a lever provided so as to protrude in the radial direction on the rotary shaft, and an engagement pin arranged on the lever in parallel with the rotary shaft and engaged with the cutout. The portable hydraulic rebar bending machine according to claim 1, which is an object.