JP2759441B2 - Equipment for manufacturing rectangular bar frames - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a rectangular bar frame, in which a steel rod such as a reinforcing bar is bent into a rectangular shape, and opposite rod ends are welded to each other.

[0002]

2. Description of the Related Art In many cases, a rectangular bar frame (commonly called a square hoop) is a reinforcing bar to be put in concrete. Since it is required according to the concrete work, the dimensions vary depending on the part used in the concrete. Conventionally, in the cottage industry, a reinforcing bar is bent using a bender, and is attached to a manual arc welding machine or a stationary welding machine to weld opposite ends.

[0003]

In large-scale concrete work, a large amount of reinforcing steel is used, so that a large number of bar frames having various dimensions are required. However, the problem is that a rectangular frame (width) is required as shown in FIG. W and height H) are indeterminate, and therefore have conventionally been manufactured manually. In other words, the process of making a rectangular bar frame involves drawing out a steel rod wound in a coil shape, taking a bending habit, dividing it into required dimensions, bending a steel rod of required dimensions into a rectangle, It is roughly divided into three welding processes. Each is a process that can be automated by a linear cutting machine, multi-vendor, and automatic welding machine. Conventionally, the productivity is poor because the connection between these steps is manually performed.

[0004]

The reason why the present invention succeeds in fully automatic operation without the need for manual labor is that the welding machine is a butt welding machine and the welding position is fixed irrespective of the product size. All of the communication mechanisms between the steps are for feeding the welding end of the steel rod to the welding position, and it is possible to immediately respond to dimensional changes while being a full-scale automatic device.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The rectangular bar frame manufacturing apparatus according to the present invention receives a steel bar of a predetermined length in a horizontal position and delivers it at an arbitrary height obliquely upward in a direction perpendicular to the bar axis in that position.
The lower end of the inclined conveyor machine frame can move horizontally along the floor, and the upper end can move vertically along the column. The variable inclined conveyor 4 can move both ends of the steel rod dropped from the upper end of the conveyor into horizontal rails 12 of elevating beams. A steel bar is formed into a rectangular shape by folding up the upper and lower bending units, then narrowing the interval between the bending units, and simultaneously folding the steel bar, and at the same time, hanging the upper side of the rectangular shape on the left and right feeders 17 which are fixed. Vendor 10,
Further, the rectangular steel rods which are transferred from the feeder to the standby conveyor 19 and are aligned and standby are slightly pushed up one by one, and the right and left rod ends on the upper side thereof are held by the rear electrode 21 and the front electrode 22, and the butt welding is performed. It is characterized by having a mold suspension type butt welding machine 20.

[0006] The bending unit is configured to abut on a corner contact metal fitting which projects just above the bending position of the steel rod in the horizontal posture, and to contact the lower surface of the steel rod below the metal fitting, and pivot upward from the horizontal posture to the vertical posture. And a folding plate for folding the steel bar. Preferably, the portal-type multi-bender is provided with a reverse-distortion push-up machine which pushes up the center of the lower side of the rectangular steel bar which is formed by bending up slightly, so as to offset welding distortion. Furthermore, when the rectangular steel bar after welding is turned down by turning its upper side outward, it is received in a horizontal posture, and the rotating frame that turns the opposite side of the upper side by 180 ° to reach the unloading position is formed. It is recommended to prepare.

[0007]

1 and 2 are an elevational view and a plan view, respectively, of an embodiment of the present invention. A steel rod enters the measuring and cutting device 2 as shown by an arrow from the straightening device 1 partially seen at the lower left of FIG. B ₀ . The straightening device 1 and the measuring device 2 are conventional ones. In this embodiment, instead of pulling out the steel rod from the coil, a straight steel material cut to a required size can be directly rolled off from the material supply device 3, but the details are omitted.

In both feeding methods, the steel rods are dropped _{one by one to} the position B ₁ on the variable inclination conveyor 4. As shown in FIG. 2, the conveyor 4 is composed of a plurality of belts arranged in parallel with a space therebetween. Since the belts are integrally inclined by the machine frame, one of the belts is provided to prevent the received steel rod from falling down. Claws 5 (FIG. 1) are attached at the same position to the address. The means for changing the inclination of the conveyor 4 is such that the upper end (the right end in FIG. 1) of the conveyor frame can be moved vertically along the pillars 10a on both sides of the portal type multi-bender 10, and the lower end of the conveyor frame is accordingly moved to the floor. You can move horizontally along the road. Specifically, the right and left ends of the upper end of the conveyor machine frame are connected to the vertical screw rods 6a in the pillars 10a on both sides of the portal type multi-bender 10.
Turn the bracket with a worm.
The movable table 7 supporting the lower end of the conveyor frame moves on the horizontal rail 8 (FIG. 1).

A steel rod B ₁ (hereinafter referred to as B) dropped on the conveyor 4
When ₁ .about.B ₆ is a sign of the position both the steel bars) reaches B ₂ of the conveyor upper end, the upper edge of the bracket 6b, the top of the guide rod (not shown) which is provided in parallel to change course to reach the working position B ₃ of the portal multivendor 10 (Figure 1). The machining position B ₃ left and right bending unit 11 illustrated in FIG. 4, the symmetrical threaded rod 12b and the rail 12a with lifting beams 12 or released Chikayose simultaneously both, steel bar B
Servo motor 13b to hold both ends of ₃ evenly,
There is a positioning head 13 or the like which is driven by the symmetric screw rod 13a to approach and move away. Height of lifting beam 12, bending unit 1
The interval between 1 and 11 is adjusted in advance by the operation panel according to the product size, so that the upper side of the rectangular steel bar matches the height of the welding position. The positions of the upper ends of the conveyor 4 and the bracket 6b also interlock with the height of the lifting beam 12. The solid line positions of the bending units 11 and 11 in FIG. 4 are the second bending positions,
Initially, bending is performed at both outer dashed line positions.

[0010] That initial bending is folded stand by bending unit 11, 11 is located outside half of the horizontal width of the product bar frame the ends of the steel bar B ₃ (FIG. 4 dashed line) as shown in FIG. 3 Te, and B _4. Then the bending unit 11,
11 is moved inward as indicated by the arrow, and is folded up at the solid line position in FIG.
_{Make 5} The bending process is performed in each of the bending units 11, 1
When the steel bar rests on the top 1 in a horizontal posture, the corner fitting 14 comes out from the rear just above the bending position. Then, the folded plate 15 abuts on the lower surface of the steel bar below the metal fitting 14, and turns upward from a horizontal posture to a vertical posture 15 'to be folded.
Although this folding mechanism will be described later, an extremely accurate corner portion was obtained by using a folded plate for simply bending a bar frame.

FIGS. 5 to 7 are detailed views of the bending unit 11 of FIG. The bending unit 11 moves left and right along the horizontal rail 12a on the front surface of the lifting beam 12, as can be clearly seen in FIG. Positioning screw rod 12 between upper and lower rails 12a
b passes through and engages with the internal thread 11b of the bending unit 11 (FIG. 7). The screw rod 12b is a symmetrical screw,
The left and right bending units 11 are symmetrically moved toward and away from each other by a servomotor. In FIG. 7, the symmetric screw rod 13a of FIG.
Was abbreviated. The steel rod lifting mechanism of the bending unit 11 uses a fluid pressure cylinder 14a to move the steel rod to a position just above the bending position of the steel rod, as shown in FIG.
7 and the folded plate 1 that pivots upward from a horizontal position along the lower surface of the steel bar to a vertical position.
5, a folded plate support member 15a which rotates around the fitting 14 with the folded plate 15 placed thereon, and a fluid pressure cylinder 15c for driving the folded plate support member 15a. The folded plate supporting member 15a is rotatable coaxially with the fitting 14 by the bracket 15b. When the cylinder 15c shown in FIG. 6 is pushed up, the bracket 15b pivots up and reaches the position indicated by the dashed line, and the folded plate 15 assumes the position 15 'indicated by the dashed line, that is, the vertical position.
Fold ₃ vertically. Some extra bending can be done in anticipation of the springback of the bent steel bar.

In the multi-bender 10 of this embodiment, at the time of the second bending shown by the solid line in FIG. 4, the center of the lower horizontal portion where the product bar frame is not welded is drawn by the chain line in FIG. Reverse distortion push-up machine 16 that slightly pushes up and curves
Is provided. This reverse distortion cancels the curvature of the lower horizontal portion due to the contraction after welding of the upper horizontal portion, and returns to a substantially linear shape, thereby preventing the product dimensions from being misaligned due to welding. In folding up the processing of the second, opposite end portions of the upper steel rod B ₅ is subjected to a fixed feeding rung 17, 17 from the portal Frames pair of right and left projecting horizontally towards the welder multivendor 10. Then, a horizontal hydraulic cylinder 18 (FIG. 1) attached to the beam of the multi-bender 10 has a left and right hanging rod 18a at its long end.
Then, the steel bar B ₅ is extruded out of the multi-bender 10 and is placed on the standby conveyor 19 attached to the feeder 17. Since the steel rod B _5, which is loaded is incorporated sent down the top guide 19a, are stopped by the stopper and push-member 23 attached to the feed rungs 17 the distal end of the welding position immediately before the welding machine 20 (FIG. 8), the conveyor Wait for the welding order while slipping on 19. In FIG. 1, the inside of the portal machine frame below the welding transformer 25 is removed to show the inside.

[0013] While the stopper and push-member 23 in FIG. 9 shows a top pushed clogs until welding position a steel bar B ₅ by a fluid pressure cylinder 23a, the side surface of the meantime push-up tool 23 is continuing role of stopper . When the upper end stepped portion of the push-up member 23 is returned to the position of the upper side of the steel rod B ₅ to wait, immediately a new steel bar B ₅ waits at Irikon to the stepped portion. Previously the end weld of the push-up clogs steel bar B _5, the welding electrode 22 is opened, a new steel bar B _5, as before, is pushed supplied up to the gripping position B ₆ between the electrodes 21 and 22.

The front electrode 22 shown in FIG.
It is a pivot drive of the hydraulic cylinder 24, rigidly added both ends near the combined upper side of the collision of the steel bar B ₆ as dashed line. FIG. 8 is a front view of the butt welding machine 20.
Transformer 25, U-shaped movable conductor 26, left and right electrode clamp (front and rear electrode) support bases 27 and 28, round bar rail 29 provided along machine frame beam for positioning and pressing movement, and on rail 29 Shown are a fluid pressure cylinder 30 for fixing the rear portion and pushing out the support base 27 to butt-weld the butted welded ends, and a portal frame 31 for supporting them in a suspended manner.

The steel rod bent into a rectangular B ₅ the upper side of the opposed rods ends are close to the chain line in FIG. 8. The two ends are held by front and rear electrodes 22 and 21, respectively. In the figure, the same reference numerals are used, but the electrodes coming out of the left support 27 and the right support 28
The polarity is different from that of the side electrode. Therefore, the pressing side support 27
Is pressed by the fluid pressure cylinder 30 toward the fixed-side support base 28, the rod ends held by the electrodes 22 and 21 are softened by electric resistance heat and pressed and welded. When welding is completed, the front electrode 22 is opened as shown in FIG.
The pressing fluid pressure cylinder 30 and the support 27 are retracted and returned.

As shown in FIGS. 1 and 2, the rectangular steel bar B ₆ after welding is turned 90 ° so that the upper side is turned outward by a rotating frame 32 with a magnet, which is a reversing device for carrying out, and then the opposite side of the upper side is turned. The rotating frame 33 is turned by 180 ° on the side and transferred to the discharge mechanism. When the first turning frame 32 is turned 90 ° and turned horizontally on the turning frame 33, then, the turning frame 33 is turned 180 ° and the horizontal pushing by the fluid pressure cylinder (not shown) is performed alternately. The product bar frame (steel bar B ₆ )
Are equally distributed on both sides. If it is necessary to remove the bulging portion of the welded portion, it is easy to add a deburring device (prior art) during the turning. It is to be noted that a control device for full automation is sufficient with a rudimentary conventional technology. Although the embodiment has been described above, it goes without saying that the present invention can be variously changed and applied in accordance with the implementation conditions without changing the gist.

[0017]

Since the object product of the present invention is a simple rectangular frame made of a steel rod, both the forming process and the welding process can be automated by well-known techniques. However, it is troublesome if each process is continuously performed and fully automated, and it is possible to cope with frequent changes in product dimensions. If the length of the steel rod sent to the multi-vendor in the forming process is changed according to the product dimensions, the absolute position of the planned welded portion of the resulting rectangular rod frame naturally changes. Each time, it is difficult to correctly insert the changed scheduled weld into the welding machine.

In addition to the rectangular bar frame, the main role in the manufacture of steel products was always the forming means, and the welding means was the armpit. However, the present invention has solved the above-mentioned problems by using the welding means as a leading role. In other words, the multi-bender, which is a means for forming a rectangular frame, is raised and lowered to match the constant welding position of the butt welding machine as the leading role, and the steel bar material is sent to the fluctuating height of the multi-bender by an inclined conveyor. did. This creates an intermediary between the multi-vendor and the butt welder,
There is no need to send the planned welded portion of the steel rod to the required position, and horizontal feeding is sufficient.

The accuracy of the product dimensions is improved by using a fillet fitting and a folded plate as a bending member of the multi-bender, and by applying a reverse strain to the opposite side of the welded portion of the rectangular bar frame. Then, a simple and accurate dispensing means of turning the welded rectangular bar frame outward from the welding position and tilting it down, and further turning it 180 ° to reach the carry-out position is also presented. According to the present invention, regardless of the simple shape, the effect of simplifying the production of a rectangular bar frame, which is difficult to fully automate due to dimensional fluctuation, and reducing the cost is significant.

[Brief description of the drawings]

FIG. 1 is an elevational view of one embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an explanatory view of a manufacturing process.

FIG. 4 is a front view of the multi-vendor.

FIG. 5 is a plan view of a bending unit on one side.

FIG. 6 is an elevation view of FIG. 5;

FIG. 7 is a side view of FIG. 6;

FIG. 8 is a front view of the butt welding machine.

FIG. 9 is a side view of a main part of FIG. 8;

FIG. 10 is a front view of two types of rectangular bar frames having different dimensions (width W and height H).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 4 Variable inclination conveyor 10 Gate type multi-bender 11 Left and right movable bending unit 14 Corner fitting 15 Folding plate 16 Reverse distortion push-up machine 20 Gate type suspended butt welding machine 21 Rear electrode of portal type suspended butt welding machine 22 Front electrode of portal type suspended butt welding machine 32 Reverse device for unloading (90 °) 33 Reverse device for unloading (180 °)

Claims (4)

(57) [Claims] In order to receive a steel rod of a predetermined length in a horizontal position and deliver it to an arbitrary height obliquely upward and perpendicular to the rod axis in that position, the lower end of the inclined conveyor machine frame moves horizontally along the floor. The upper end is a variable inclined conveyor that can move vertically along the column, the ends of the steel rod dropped from the upper end of the conveyor,
The steel bar is formed into a rectangular shape by folding it up and down with the right and left bending units on the horizontal rail 12 of the lifting beam, and then narrowing the interval between the bending units, and at the same time, the left and right feeds where the upper side of the rectangle is fixed. The gate-type multi-vendor to be hung on the lodge, and the rectangular steel bars which are moved from the lodge to the standby conveyor and are aligned and awaited, are slightly pushed up one by one, and the left and right rod ends on the upper side are held by the rear electrode and the front electrode. An apparatus for manufacturing a rectangular bar frame, comprising a portal-type suspended butt welding machine for performing butt welding. 2. The apparatus according to claim 1, wherein the bending unit abuts on a corner fitting which projects just above a bending position of the steel rod in a horizontal posture, and a lower surface of the steel rod below the fitting. A folding plate for turning upward from a horizontal posture to a vertical posture to fold up a steel bar. 3. The apparatus according to claim 1, wherein the portal-type multi-bender is configured such that a central portion of a lower side of a rectangular steel bar formed by bending is slightly higher than both end portions. An apparatus for manufacturing a rectangular bar frame, comprising a reverse-distortion push-up machine that pushes up to compensate for distortion. 4. The apparatus according to any one of claims 1 to 3, wherein when the rectangular steel rod having been welded is turned down with its upper side turned outward, the rod is placed in a horizontal posture. An apparatus for manufacturing a rectangular bar frame, comprising: a rotating frame that receives and rotates the opposite side of the upper side by 180 ° to reach the carry-out position.