CN108620512B

CN108620512B - Reinforcing bar hoop bending system for building

Info

Publication number: CN108620512B
Application number: CN201810445355.XA
Authority: CN
Inventors: 李少红; 任荣
Original assignee: Qingdao Agricultural University
Current assignee: Qingdao Agricultural University
Priority date: 2017-07-25
Filing date: 2018-05-11
Publication date: 2021-02-12
Anticipated expiration: 2038-05-11
Also published as: CN108620512A; CN108580741A; CN108580741B

Abstract

The invention provides a reinforcing steel bar hoop bending system for buildings, which comprises a rack and a plurality of hoop bending machine heads, wherein each hoop bending machine head comprises a mounting seat, a mandrel, a twisting head, a gear shaft and a driving mechanism, the upper surface of the mounting seat is provided with a mounting frame, the gear shaft is provided with a hollow shaft hole, the driving mechanism is used for driving the gear shaft to rotate on the mounting frame, the driving mechanism is also used for driving the mandrel to slide in the hollow shaft hole, the twisting head comprises a twisting head shaft, a rotating shell and a connecting arm, the rotating shell is provided with a strip-shaped sliding groove, the rotating shell is arranged on the gear shaft, the connecting arm is arranged in the strip-shaped sliding groove, the twisting head shaft is arranged on the outer end part of the connecting arm, the connecting arm can rotate relative to the mandrel, and the connecting arm can move along with the. The processing efficiency of the reinforcing steel bar hoop bending equipment is improved, and the labor intensity of workers is reduced.

Description

Reinforcing bar hoop bending system for building

Technical Field

The invention relates to the technical field of buildings, in particular to a reinforcing steel bar hoop bending system for a building.

Background

With the rapid development of economic construction, industries such as building construction and railway construction use a large amount of steel bars, and the steel bars need to be bent according to different use requirements, chinese patent nos. 2014105210114, 2014108568821 and 2014107659772 disclose a method for driving a mandrel in hoop bending equipment to stretch and turn and twisting the head so as to reduce the manufacturing cost of the equipment. However, in the process of clamping the reinforcing steel bar, an additional clamping cylinder is required to be added to position the reinforcing steel bar, which requires an additional procedure for controlling the clamping cylinder in terms of control procedure, resulting in a complicated control procedure and increased manufacturing cost. The invention aims to solve the technical problem of how to design a building reinforcing steel bar hoop bending system with simple control process and low manufacturing cost.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides a reinforcing steel bar hoop bending system for buildings, and aims to improve the processing efficiency of double-head bidirectional hoop bending equipment and reduce the labor intensity of workers.

In order to solve the technical problems, the invention provides a reinforcing steel bar hoop bending system for buildings, which comprises a rack and a plurality of hoop bending machine heads, wherein each hoop bending machine head comprises a mounting seat, a driving mechanism, two mandrels, two gear shafts and two twisting heads; the driving mechanism comprises a driving oil cylinder, a sliding rod, a first vertical rack, a second vertical rack, a horizontal rack and a first gear, the driving oil cylinder is provided with an oil cylinder rod, the driving oil cylinder is fixed on the mounting seat, and the sliding rod and the oil cylinder rod are matched to form a piston cylinder structure; the sliding rod is provided with a first mounting platform, the first mounting platform is provided with two first vertical racks which are oppositely arranged, the first vertical racks can be horizontally and slidably arranged on the first mounting platform and can move up and down along with the first mounting platform, each first vertical rack is provided with a first vertical guide sliding rail, the first vertical guide sliding rails can be horizontally and slidably arranged on the mounting frame, a first connecting rod assembly is arranged between the two first vertical guide sliding rails, the first connecting rod assembly comprises a first handle and two first connecting rods, the middle part of the first handle is hinged on the mounting frame, one end parts of the two first connecting rods are hinged at the inner end part of the first handle together, and the other end parts of the first connecting rods are hinged on the corresponding first vertical guide sliding rails, the first connecting rod assembly is used for selectively driving one of the first vertical racks to be meshed with the gear shaft; the first gear is rotatably connected to the mounting frame, the second vertical rack and the horizontal rack are respectively meshed with the first gear, the oil cylinder rod is further provided with a mounting plate, the mounting plate is provided with two strip-shaped through holes, each strip-shaped through hole is internally provided with a slidable guide block, a through hole communicated with the strip-shaped through holes is formed in each guide block, each guide block is provided with the second vertical rack, the lower end part of the second vertical rack is provided with a guide post which is connected in the through hole in a sliding manner, a first spring is arranged between the lower part of the second vertical rack and the guide block, each second vertical rack is provided with a second vertical guide slide rail, the second vertical guide slide rail is arranged on the mounting frame in a sliding manner, and a second connecting rod assembly is arranged between the two second vertical guide slide rails, the second connecting rod assembly comprises a second handle and two second connecting rods, the middle part of the second handle is hinged to the mounting frame, one end parts of the two second connecting rods are hinged to the inner end part of the second handle together, the other end parts of the second connecting rods are hinged to the corresponding second vertical guide sliding rails, the second connecting rod assembly is used for selectively driving one of the second vertical racks to be meshed with the first gear, and the two end parts of the horizontal rack are respectively connected with the core shaft; the outer end part of the mandrel is provided with a positioning groove, the positioning groove is horizontally arranged, a pre-tightening assembly is arranged in the mandrel and comprises an arc-shaped rack, a second gear, a third vertical rack and a pressing block, an arc-shaped guide groove is formed in the inner end part of the mandrel, a vertical guide groove communicated with the positioning groove is formed in the mandrel, the arc-shaped rack is arranged in the arc-shaped guide groove in a sliding mode, a sliding block is further arranged in the arc-shaped guide groove in a sliding mode, a second spring is arranged between the sliding block and the arc-shaped rack, the third vertical rack is arranged in the vertical guide groove in a sliding mode, the second gear is arranged on the mandrel in a rotating mode, the arc-shaped rack and the third vertical rack are respectively meshed with the second gear, and the pressing block is; the twisting head is provided with a protruding structure which is matched with the sliding block to drive the sliding block to move.

Furthermore, the upper part and the lower part of the positioning groove on the mandrel are respectively provided with the pre-tightening assembly, the inner end part of the mandrel is provided with the arc-shaped guide grooves which are arranged up and down, the upper part and the lower part of the mandrel are respectively provided with the vertical guide grooves communicated with the positioning groove, the arc-shaped racks are arranged in the corresponding arc-shaped guide grooves in a sliding manner, and the third vertical racks are arranged in the corresponding vertical guide grooves in a sliding manner.

Further, turn round the head including turning round the head axle, rotating shell and linking arm, it is provided with the bar spout to rotate on the shell, the linking arm sets up in the bar spout, turn round the head axle and set up on the outer tip of linking arm, the linking arm can for the dabber rotates, the linking arm can follow the dabber removes, it is provided with first ring flange to rotate the shell, be provided with the second ring flange on the gear shaft, first ring flange detachable installs on the second ring flange.

Further, the inner end part of the mandrel is detachably arranged on the horizontal rack.

Compared with the prior art, the invention has the beneficial effects that: the utility model provides a reinforcing bar hoop bending system for building, through setting up the wrench end into split type structure, the bar spout on the rotation shell can the direction linking arm follow the dabber and move together, thereby realize the wrench end axle follows the dabber and moves, and the linking arm can also rotate relative to the dabber, so, the gear shaft drives the rotation shell and rotates simultaneously, make the linking arm drive the wrench end axle and rotate, in the in-service use process, after the aircraft nose of last station finishes crooked to the reinforcing bar, the wrench end axle in the aircraft nose of last station can be followed dabber and retracted, the aircraft nose of next station can reverse bending to the reinforcing bar as required, at this moment, because the wrench end axle and the dabber of the aircraft nose of last station are all retracted, can not hinder the bending operation of next station, so as to treat the reinforcing bar of processing and carry out arbitrary direction bending processing and need the position of workman manual, the processing efficiency of the reinforcing steel bar hoop bending equipment is improved, and the labor intensity of workers is reduced. Meanwhile, in the process of rotating the driving mandrel and the twisting head through the driving oil cylinder, when the twisting head rotates, the corresponding sliding block is driven by the protruding structure on the twisting head to move in the arc-shaped sliding groove, the sliding block applies pressure to the arc-shaped rack through the second spring, the arc-shaped rack moves and drives the second gear to rotate, the second gear drives the third vertical rack to drive the pressing block to move downwards, the pressing block presses the reinforcing steel bar and cannot move continuously in the process of hoop bending along with the continuous rotation of the twisting head, the protruding structure drives the sliding block to move continuously and compress the second spring, the pressing block applies larger positioning pressure to the reinforcing steel bar, the reliable positioning of the reinforcing steel bar is ensured, the clamping oil cylinder for clamping the reinforcing steel bar is not required to be additionally added, the reinforcing steel bar is positioned by adopting a pure mechanical mechanism, the cost.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a reinforcing bar hoop bending system for construction according to the present invention;

FIG. 2 is a schematic view of a partial structure of an embodiment of the reinforcing bar hoop bending system for construction according to the present invention;

FIG. 3 is a schematic view of a second embodiment of a local structure of the reinforcing bar hoop bending system for construction according to the present invention;

FIG. 4 is a partial cross-sectional view of an embodiment of the reinforcing bar hoop bending system for construction of the present invention;

FIG. 5 is a partial assembly view of a twist head and a mandrel in an embodiment of the reinforcing bar hoop bending system for construction of the present invention;

FIG. 6 is a schematic structural diagram of a connecting arm in an embodiment of the reinforcing bar hoop bending system for construction according to the present invention;

FIG. 7 is a first schematic structural diagram of a mandrel in an embodiment of the reinforcing bar hoop bending system for construction according to the present invention;

FIG. 8 is a schematic structural diagram of a mandrel in an embodiment of the reinforcing bar hoop bending system for construction according to the present invention;

FIG. 9 is a third schematic structural view of a mandrel in an embodiment of the reinforcing bar hoop bending system for construction according to the present invention;

fig. 10 is a reference diagram of the use state of the embodiment of the reinforcing bar hoop bending system for construction of the invention.

Detailed Description

For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.

As shown in fig. 1-10, in the actual use process of the reinforcing bar hoop bending system for building, a plurality of heads can be used to cooperate to bend the hoop, and a plurality of hoop bending heads 200 are installed on the frame to realize the hoop bending operation. The hoop bending machine head 200 comprises a mounting seat 1, two mandrels 3, two twisting heads 4, two gear shafts 5 and a driving mechanism 6, wherein a mounting rack 11 is arranged on the upper surface of the mounting seat 1, the gear shafts 5 are provided with hollow shaft holes (not marked), the driving mechanism is used for driving the gear shafts 5 to rotate on the mounting rack 11, and the driving mechanism is also used for driving the mandrels 3 to slide in the hollow shaft holes;

the driving mechanism 6 comprises a driving oil cylinder 61, a sliding rod 62, a first vertical rack 63, a second vertical rack 64, a horizontal rack 65 and a first gear 66, the driving oil cylinder 61 is fixed on the mounting base 1, the sliding rod 62 is connected to the end portion of an oil cylinder rod 611 of the driving oil cylinder 61 in a sliding mode, the sliding rod 62 and the end portion of the oil cylinder rod 611 form a piston cylinder structure, the first vertical rack 63 is installed on the sliding rod 62, the first vertical rack 63 is meshed with the gear shaft 5, the first gear 66 is rotatably connected to the mounting frame 11, and the second vertical rack 64 and the horizontal rack 65 are respectively meshed with the first gear 66.

Wherein, in order to meet the requirement of bending the torsion head 4 by rotating in both directions, two first vertical racks 63 arranged oppositely are adopted, the gear shaft 5 is located between the two first vertical racks 63, the gear shaft 5 is selectively meshed with one of the first vertical racks 63 through a first link assembly, specifically, a first mounting platform 621 is arranged on the slide bar 62, the first mounting platform 621 is provided with two first vertical racks 63 arranged oppositely, the first vertical rack 63 can be horizontally and slidably arranged on the first mounting platform 621 and can move up and down along with the first mounting platform 621, each first vertical rack 63 is configured with a first vertical guide slide rail 631, the first vertical guide slide rail 631 can be horizontally and slidably arranged on the mounting rack 11, and a first link assembly is arranged between the two first vertical guide slide rails 631, the first connecting rod assembly comprises a first handle 7 and two first connecting rods 71, the middle part of the first handle 7 is hinged on the mounting frame 11, one end parts of the two first connecting rods 71 are hinged at the inner end part of the first handle 7, the other end parts of the first connecting rods 71 are hinged on the corresponding first vertical guide rails 631, in the actual use process, an operator can drive the first handle 7 to rotate back and forth in an electric or manual mode, the first handle 7 drives the two first vertical guide rails 631 to slide on the mounting frame 11 through the two first connecting rods 71, so that one first vertical rack 63 is close to and meshed with the gear shaft 5, and the other first vertical rack 63 is far away from the gear shaft 5, therefore, the first vertical rack 63 can be adjusted without being detached when the hoop bending direction is changed, and only the first vertical racks 63 on the two sides of the gear shaft 5 need to be switched to be meshed with, the forward and reverse rotation of the gear shaft 5 can be switched, and the hoop bending requirements in different directions are met.

Meanwhile, the end of the cylinder rod 611 of the driving cylinder 61 is further provided with a mounting plate 612, the mounting plate 612 is provided with strip-shaped through holes 6121, each strip-shaped through hole 6121 is provided with a slidable guide block 644, each guide block 644 is provided with a through hole (not shown) communicated with the strip-shaped through hole, each guide block 644 is provided with the second vertical rack 64, the lower end of the second vertical rack 64 is provided with a guide post 641, the guide post 641 is slidably connected in the through hole, a first spring 642 is arranged between the lower end of the second vertical rack 64 and the mounting plate 612, each second vertical rack 64 is provided with a second vertical guide rail 643, the second vertical guide rail 643 is horizontally slidably arranged on the mounting frame 11, and a second connecting rod assembly is arranged between the two second vertical guide rails 643, the second connecting rod assembly 8 comprises a second handle 8 and two second connecting rods 81, the middle part of the second handle 8 is hinged to the mounting frame 11, one end parts of the two second connecting rods 81 are hinged to the inner end part of the second handle 8 together, the other end parts of the second connecting rods 81 are hinged to the corresponding second vertical guide rails 643, the second connecting rod assembly is used for selectively driving one of the second vertical racks 64 to be meshed with the first gear 66, and two end parts of the horizontal rack 65 are respectively connected with the mandrels 3. In the actual use process, an operator can drive the second handle 8 to rotate back and forth in an electric or manual mode, the second handle 8 drives the two second vertical guide rails 643 to slide on the mounting frame 11 through the two second connecting rods 81, so that one second vertical rack 64 is close to and meshed with the first gear 66, and the other second vertical rack 64 is far away from the first gear 66, so that the mandrels 3 at two ends can be switched to extend out of the twisting heads 4 at the corresponding sides for hoop bending treatment, in the actual use process, after the twisting heads 4 at one side complete hoop bending operation, the operator needs to take out the workpieces which are subjected to hoop bending treatment, and at the moment, the operation of switching the twisting heads 4 is performed through the second connecting rod assembly 8, so that the mandrels 3 in the twisting heads 4 at the other side extend out for hoop bending, the twisting heads 4 at two sides are alternately bent by fully utilizing the time in the workpiece taking process, to improve the production efficiency.

In addition, the twisting head 4 includes a twisting head shaft 41, a rotating housing 43 and a connecting arm 42, a strip-shaped sliding slot (not labeled) is provided on the rotating housing 42, the rotating housing 43 is provided on the gear shaft 5, the connecting arm 42 is provided in the strip-shaped sliding slot, the twisting head shaft 41 is provided on an outer end portion of the connecting arm 42, the connecting arm 42 is rotatable relative to the spindle 3, and the connecting arm 42 is movable along with the spindle 3. It is specific, turn round head 4 and adopt split type structure, turn round head 4 and realize being connected with gear shaft 5 through rotating shell 43, gear shaft 5 drives in the rotation process and turns round head 4 and wholly rotate, simultaneously, turn round head axle 41 and can follow dabber 3 through linking arm 42 and remove, it is specific, linking arm 42 is located the bar spout, when dabber 3 reciprocating motion, linking arm 42 also can follow dabber 3 and remove in the bar spout, thereby can realize dabber 3 and turn round head axle 41 synchronous motion, because linking arm 42 only can slide in the bar spout for rotating shell 43, when gear shaft 5 rotates, make linking arm 42 follow rotation shell 43 and rotate together through the bar spout is spacing to linking arm 42, thereby realize turning round head axle 41 and rotate, in order to accomplish the operation of crooked reinforcing bar. In the actual use process, after the hoop bending machine head 200 at the previous station bends the steel bar, the mandrel 3 and the twisting head shaft 41 retract together, so that even if the hoop bending machine head 200 at the next station bends the steel bar reversely, the twisting head shaft 41 in the hoop bending machine head 200 at the previous station can not obstruct the steel bar to be bent, the steel bar can be bent in any direction in sequence according to the requirement, the position of the steel bar does not need to be manually adjusted by an operator in the whole operation process, the processing efficiency is greatly improved, and the labor intensity of workers is greatly reduced.

Further, after the hoop bending machine head 200 is mounted on the frame, in order to adjust the bending direction of the torsion shaft 41 conveniently, the rotating housing 43 is provided with a first flange 44, the gear shaft 5 is provided with a second flange (not shown), and the first flange 44 is detachably mounted on the second flange; the upper end of the slide bar 62 is provided with a mounting base (not shown), the mounting base is provided with two mounting portions for mounting the first vertical rack 63, and the vertical projection of the gear shaft 5 on the mounting base is located between the two mounting portions. Specifically, in general, after the hoop bending machine head 200 is mounted on the frame, the rotation direction of the hoop bending machine head 200 generally does not need to be changed, and when a new steel bar needs to be processed, the bending direction of the hoop bending machine head 200 at a different station will be changed, in the conventional technology, the machine head is replaced by another machine head with the required bending direction, but the bending direction of the hoop bending machine head 200 in this embodiment can be adjusted according to the need, first, the other side of the twisting head shaft 41 can be rotated by detaching the first flange 44 to facilitate the requirement of reverse bending, and the first vertical rack 63 is detachably mounted on the mounting portion at the other side of the mounting base, so that when the first vertical rack 63 moves upwards, the gear shaft 5 can be driven to rotate reversely, thereby realizing the requirement of reverse bending without detaching the whole hoop bending machine head 200, and simultaneously, without configuring a plurality of machine heads with different bending directions on the industrial site, effectively reducing the use cost. The specific operation process is as follows: when the bending direction of the hoop bending machine head 200 at a certain station needs to be adjusted, the connection between the first flange plate 44 and the second flange plate is only required to be loosened, the torsion head shaft 41 is rotated to the other side by rotating the rotating housing 43, and the first vertical rack 63 is mounted to the other side of the gear shaft 5. And a detachable mounting for the inner end of the spindle 3 may also be provided on said horizontal rack 65.

In addition, the outer end of the mandrel 3 in this embodiment is provided with a positioning groove 30, and the positioning groove 30 is horizontally arranged. Specifically, the positioning groove 30 is used for positioning a steel bar to be processed, and the steel bar is inserted into the positioning groove 30 for positioning so that the torque shaft 41 can be bent. Because the thickness or the diameter size of different reinforcing bars are different, the clamping cylinder positioning reinforcing bar generally needs to be added in the prior art, and in order to further reduce the manufacturing cost and simplify the control process, the hoop bending machine head 200 in the embodiment also adopts the driving cylinder 61 to clamp the reinforcing bar, which is specifically as follows: as shown in fig. 6-9, a spindle 3 is provided with a pretension assembly at the upper and lower portions of the positioning slot 30, the pretension assembly includes an arc-shaped rack 341, a second gear 342, a third vertical rack 343 and a pressing block 344, the inner end of the spindle 3 is provided with an arc-shaped guide slot 31 arranged up and down, the upper and lower portions of the spindle 3 are respectively provided with a vertical guide slot (not shown) communicated with the positioning slot 30, the arc-shaped rack 341 is slidably disposed in the corresponding arc-shaped guide slot 31, a slider 32 is also slidably disposed in the arc-shaped guide slot 31, a second spring 33 is disposed between the slider 32 and the arc-shaped rack 341, the third vertical rack 343 is slidably disposed in the corresponding vertical guide slot, the second gear 342 is rotatably disposed on the spindle 3, and the arc-shaped rack 341 and the third vertical rack 343 are respectively engaged with the second gear 342, the pressing block 344 is fixed on the third vertical rack 343; the connecting arm 42 is provided with a convex structure 421 which is matched with the sliding block 32 to drive the sliding block 32 to move. Specifically, when the twist head 4 rotates, the protrusion structure 421 on the connecting arm 42 drives the corresponding slider 32 to move, so as to drive the corresponding pressing block 344 to move, taking the pre-tightening assembly located at the upper portion as an example, when the connecting arm 42 rotates clockwise in the drawing, the corresponding protrusion structure 421 will drive the slider 32 in the pre-tightening assembly at the upper portion to move in the arc-shaped guide slot 31, the slider 32 applies pressure to the arc-shaped rack 341 through the second spring 33, so as to move the arc-shaped rack 341 and drive the second gear 342 to rotate, the second gear 342 will drive the third vertical rack 343 to drive the pressing block 344 to move downward, so as to cause the pressing block 344 to press the reinforcing steel bar, and as the connecting arm 42 drives the twist head shaft 41 to continue to rotate to bend the reinforcing steel bar, the pressing block 344 will not continue to move after pressing the reinforcing steel bar, at this time, the protrusion structure 421 will drive the slider 32 to, therefore, the positioning pressure of the pressing block 344 on the steel bar can be gradually increased, so that the steel bar can be more favorably positioned along with the gradual bending of the steel bar. Meanwhile, the hoop bending machine head 200 in the embodiment does not need to additionally increase a clamping oil cylinder, and a pure mechanical structure is adopted to realize pre-tightening and positioning of the reinforcing steel bars, so that the cost can be effectively reduced, and the control process can be effectively simplified.

Further, in order to better position the position-adjusted hoop bending machine head 200, the rack comprises a guide rail 100, two sides of the guide rail 100 are respectively and fixedly provided with a clamping plate 101, the upper surface of the clamping plate 101 forms a guiding inclined plane, and the lower surface of the clamping plate 101 is provided with a first positioning rack 1011; one end of the mounting seat 1 is provided with a clamping device, the clamping device comprises buckle plates 201 and wedge blocks 203, the buckle plates 201 are oppositely arranged and fixed on the mounting seat 1, the lower ends of the buckle plates 201 are provided with second positioning racks 2011, and the second positioning racks 2011 are positioned below the edges of the clamp plates 101; wedge block 203 is located between two buckle boards 201 and along the extending direction sliding connection of perpendicular to guide rail 100 on mount pad 1, and the inclined plane and the direction inclined plane contact of wedge block 203, and wedge block 203 has seted up the screw hole, and threaded connection has lead screw 202 between two wedge blocks 203, and the screw thread direction of the screw thread section at lead screw 202 both ends is opposite. Specifically, after the mounting base 1 is adjusted to the position on the guide rail 100 in a sliding manner, the screw 202 is rotated to enable the two wedge blocks 203 to be close to each other synchronously, and the mounting base 1 is enabled to ascend through the cooperation of the wedge blocks 203 and the guide inclined planes, so that the second positioning rack 2011 is finally meshed with the first positioning rack 1011, and therefore the hoop bending machine head 200 can be positioned and mounted more firmly and reliably. And the guide rail 100 is further provided with a driving rack 400, the mounting base 1 is provided with a driving gear 500, and the driving gear 500 is meshed with the driving rack 400. An operator drives the driving gear 500 to rotate through a hand wheel connected to the driving gear 500, so that the hoop bending machine head 200 moves smoothly on the guide rail 100.

Furthermore, in order to enrich the function of the reinforcing bar hoop bending system for construction of the present embodiment, a cutting machine 600 is further disposed on the machine frame, and the cutting machine 600 is slidably connected to the guide rail 100 perpendicular to the extending direction of the guide rail 100. Specifically, in the in-service use process, after the position of each hoop bending machine head 200 has been adjusted, make the distance between the hoop bending machine head 200 of foremost side and the cutter 600 just in time satisfy the machining length of reinforcing bar, whole reinforcing bar is put into this embodiment reinforcing bar hoop bending system for building back, moves through cutter 600 and is close to the reinforcing bar and can directly cut off, thereby reduces the workman and makes a round trip to carry.

The above description is only a preferred and practical embodiment of the present invention, and does not limit the scope of the present invention. All structural equivalents made by using the contents of the specification and the drawings are included in the scope of the present invention.

Claims

1. A reinforcing bar hoop bending system for buildings comprises a rack and a plurality of hoop bending machine heads, and is characterized in that the hoop bending machine heads comprise mounting seats, driving mechanisms, two mandrels, two gear shafts and two twisting heads, the mounting seats are mounted on the rack, mounting frames are arranged on the mounting seats, the gear shafts are provided with hollow shaft holes, and the mandrels are slidably arranged in the hollow shaft holes of the corresponding gear shafts; the driving mechanism comprises a driving oil cylinder, a sliding rod, a first vertical rack, a second vertical rack, a horizontal rack and a first gear, the driving oil cylinder is provided with an oil cylinder rod, the driving oil cylinder is fixed on the mounting seat, and the sliding rod and the oil cylinder rod are matched to form a piston cylinder structure; the sliding rod is provided with a first mounting platform, the first mounting platform is provided with two first vertical racks which are oppositely arranged, the first vertical racks can be horizontally and slidably arranged on the first mounting platform and can move up and down along with the first mounting platform, each first vertical rack is provided with a first vertical guide sliding rail, the first vertical guide sliding rails can be horizontally and slidably arranged on the mounting frame, a first connecting rod assembly is arranged between the two first vertical guide sliding rails, the first connecting rod assembly comprises a first handle and two first connecting rods, the middle part of the first handle is hinged on the mounting frame, one end parts of the two first connecting rods are hinged at the inner end part of the first handle together, and the other end parts of the first connecting rods are hinged on the corresponding first vertical guide sliding rails, the first connecting rod assembly is used for selectively driving one of the first vertical racks to be meshed with the gear shaft; the first gear is rotatably connected to the mounting frame, the second vertical rack and the horizontal rack are respectively meshed with the first gear, the oil cylinder rod is further provided with a mounting plate, the mounting plate is provided with two strip-shaped through holes, each strip-shaped through hole is internally provided with a slidable guide block, a through hole communicated with the strip-shaped through holes is formed in each guide block, each guide block is provided with the second vertical rack, the lower end part of the second vertical rack is provided with a guide post which is connected in the through hole in a sliding manner, a first spring is arranged between the lower part of the second vertical rack and the guide block, each second vertical rack is provided with a second vertical guide slide rail, the second vertical guide slide rail is arranged on the mounting frame in a sliding manner, and a second connecting rod assembly is arranged between the two second vertical guide slide rails, the second connecting rod assembly comprises a second handle and two second connecting rods, the middle part of the second handle is hinged to the mounting frame, one end parts of the two second connecting rods are hinged to the inner end part of the second handle together, the other end parts of the second connecting rods are hinged to the corresponding second vertical guide sliding rails, the second connecting rod assembly is used for selectively driving one of the second vertical racks to be meshed with the first gear, and the two end parts of the horizontal rack are respectively connected with the core shaft; the outer end part of the mandrel is provided with a positioning groove, the positioning groove is horizontally arranged, a pre-tightening assembly is arranged in the mandrel and comprises an arc-shaped rack, a second gear, a third vertical rack and a pressing block, an arc-shaped guide groove is formed in the inner end part of the mandrel, a vertical guide groove communicated with the positioning groove is formed in the mandrel, the arc-shaped rack is arranged in the arc-shaped guide groove in a sliding mode, a sliding block is further arranged in the arc-shaped guide groove in a sliding mode, a second spring is arranged between the sliding block and the arc-shaped rack, the third vertical rack is arranged in the vertical guide groove in a sliding mode, the second gear is arranged on the mandrel in a rotating mode, the arc-shaped rack and the third vertical rack are respectively meshed with the second gear, and the pressing block is; the twisting head is provided with a protruding structure which is matched with the sliding block to drive the sliding block to move;

the first handle drives the two first vertical guide sliding rails to slide on the mounting rack through the two first connecting rods by driving the first handle to rotate back and forth, so that one of the first vertical racks is meshed with the gear shaft, and the other first vertical rack is far away from the gear shaft;

in addition, by driving the second handle to rotate back and forth, the second handle will drive the two second vertical guide sliding rails to slide on the mounting rack through the two second connecting rods, so that one of the second vertical racks is meshed with the first gear, and the other second vertical rack is far away from the first gear.

2. The reinforcing bar hoop bending system for buildings as claimed in claim 1, wherein the pre-tightening assembly is respectively disposed on the upper portion and the lower portion of the mandrel at the positioning groove, the inner end portion of the mandrel is opened with the arc-shaped guide grooves arranged up and down, the vertical guide grooves communicating with the positioning groove are respectively opened on the upper portion and the lower portion of the mandrel, the arc-shaped racks are slidably disposed in the corresponding arc-shaped guide grooves, and the third vertical rack is slidably disposed in the corresponding vertical guide grooves.

3. The reinforcing bar hoop bending system for building of claim 1, wherein the twisting head comprises a twisting head shaft, a rotating housing and a connecting arm, the rotating housing is provided with a bar-shaped sliding groove, the connecting arm is arranged in the bar-shaped sliding groove, the twisting head shaft is arranged on the outer end portion of the connecting arm, the connecting arm can rotate relative to the mandrel, the connecting arm can move along with the mandrel, the rotating housing is provided with a first flange, the gear shaft is provided with a second flange, and the first flange is detachably mounted on the second flange.

4. The construction rebar hoop bending system as set forth in claim 1 wherein the inner end of the mandrel is removably mounted to the horizontal rack.