Numerical control steel bar hoop bending machine

Abstract

The application discloses a numerical control steel bar hoop bending machine and relates to the technical field of steel bar processing equipment. The numerical control steel bar hoop bending machine comprises a rack, a conveying mechanism, a shearing mechanism, a bending mechanism arranged in the middle of the rack, a guide assembly and a bending assembly. The guide assembly comprises a pushing sleeve, a guide block which is detachably connected to the end of the pushing sleeve, and a pneumatic pushing piece which is used for driving the rotating sleeve to slide relative to the pushing sleeve. The middle of the pushing sleeve is provided with a first pressure relief cavity, a second pressure relief cavity and a pressure relief channel which are communicated with each other, and the outlet of the pressure relief channel is arranged between the pushing sleeve and the rotating sleeve. The pressure relief channel can release the pressure of the pneumatic pushing piece. The bending assembly comprises the rotating sleeve and a bending block. The rotating sleeve is rotated relative to the pushing sleeve, so that the bending block and the guide block are matched to complete the bending of the steel bar. The above components are arranged, the problem that the action is invalid due to the poor exhaust of the cylinder is effectively solved, and the purpose of quickly replacing the bending die is achieved.

Description

Technical Field

[0001] This invention relates to the field of steel bar processing equipment technology, and in particular to a CNC steel bar bending machine. Background Technology

[0002] CNC rebar bending machines are automated rebar processing equipment that integrates straightening, bending, and shearing. They are widely used in construction projects such as buildings, bridges, and tunnels to efficiently and accurately produce rebar stirrups and bent bars of various specifications. Their core working principle involves a CNC system driving an actuator that bends the rebar at a predetermined angle and shape using bending components.

[0003] For example, a rebar bending mechanism applied to an automatic hoop bending machine, as described in application number CN202010760633.8, includes a rotary motor and a bending head that can rotate circumferentially under the drive of the motor. A movable bending bar is detachably installed on the bending head. A rebar positioning component is also detachably installed on the bending head and next to the movable bending bar, and the rebar positioning component has a rebar positioning groove in the middle. A hollow outer shaft arranged vertically is fixedly installed under the bending head. The hollow outer shaft can rotate under the drive of the bending motor and drive the movable bending bar to rotate synchronously, bending the rebar extending out of the rebar positioning groove at a set angle. During bending, the end of the rebar positioning component near the movable bending bar forms a rebar clamping part.

[0004] In existing technologies, bending components are mostly driven by hydraulic or pneumatic methods. Among them, pneumatic drive is widely used due to its advantages such as simple structure and low cost. It applies force directly or indirectly to the steel bar to complete the bending operation by extending and retracting the piston rod, and can adjust the bending direction.

[0005] However, through long-term production practice and equipment maintenance, the applicant has discovered several problems with pneumatically driven bending machines. For example, poor cylinder exhaust can lead to operational failures. During prolonged, high-intensity continuous operation, moisture, oil, and dust impurities in the compressed air easily accumulate in the exhaust port of the pneumatic solenoid valve and nearby pipes, forming viscous substances or even solid blockages. When the cylinder needs to retract, the gas in its chamber cannot be quickly and smoothly discharged due to the blocked exhaust channel, resulting in excessive back pressure. This prevents the cylinder piston from resetting properly, causing the bending component to "jaw" in the extended position and unable to retract, interrupting the processing flow. This not only severely impacts production efficiency but also requires shutdown for inspection and cleaning, resulting in high maintenance costs. Furthermore, existing bending components are inconvenient to disassemble and assemble; traditional fixing methods often use bolts. During replacement, operators need to use tools to unscrew multiple bolts, disassemble the old component, install the new component, and retighten it. This process is cumbersome, time-consuming, and labor-intensive, severely restricting the flexibility of the equipment in switching between different processing needs. It is difficult to adapt to the demand for "rapid mold change" in modern production, thus reducing the overall utilization rate of the equipment.

[0006] Therefore, it is necessary to invent a CNC steel bar bending machine to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a CNC rebar bending machine to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a CNC rebar bending machine, comprising a frame, a conveying mechanism, a shearing mechanism, and a bending mechanism installed in the middle of the frame. The bending mechanism includes a guiding component and a bending component, both ends of which can slide relative to the panel of the frame. The guiding component includes a pushing sleeve slidably connected to the middle of the frame; a guiding block detachably connected to the end of the pushing sleeve, and having a notch in the middle for guiding the extension of the rebar; the bending component includes a rotating sleeve rotatably fitted on the outside of the pushing sleeve and slidable along the axis of the pushing sleeve; and a bending block rotatably connected to the side of the rotating sleeve near the guiding block. The rotating sleeve rotates relative to the pushing sleeve, causing the bending block and the guiding block to cooperate to complete the bending process. The device includes: a bending of reinforcing bars; a pneumatic actuator fixedly connected to the outside of a push sleeve, with at least two actuators evenly arranged relative to the axis of the push sleeve; the output end of each pneumatic actuator being movably connected to a rotating sleeve to drive the rotating sleeve to slide relative to the push sleeve; a first pressure relief chamber and a second pressure relief chamber being provided in the middle of the push sleeve, the first pressure relief chamber being connected to one end of the pneumatic actuator, and the second pressure relief chamber being connected to the other end of the pneumatic actuator; a pressure relief channel being provided in the middle of the push sleeve, with multiple channels evenly distributed along the axis of the push sleeve, the first and second pressure relief chambers being connected to the pressure relief channels, and the outlet of the pressure relief channel being located between the push sleeve and the rotating sleeve; and the first and second pressure relief chambers enabling the pneumatic actuator to release pressure.

[0009] Preferably, the guiding assembly further includes: a pull rod slidably disposed inside the first pressure relief chamber and passing through the end of the push sleeve, with a first elastic element fitted on the outer side of the pull rod; a first pressure relief pipe, one end of which is connected to one end of the pneumatic pusher and the other end of which is connected to the first pressure relief chamber; the first elastic element pushes the pull rod to block the connection between the first pressure relief pipe and the first pressure relief chamber; and a linear drive element fixedly connected inside the frame, with its output end fixedly connected to the end of the pull rod, for driving the push sleeve to slide relative to the frame.

[0010] Preferably, the guiding assembly further includes: an annular pressure relief chamber, which is located inside the push sleeve and communicates with the side wall of the second pressure relief chamber; and a second pressure relief pipe, one end of which is connected to the end of the pneumatic pusher away from the first pressure relief chamber, and the other end of which is connected to the annular pressure relief chamber.

[0011] Preferably, the bending mechanism further includes: a prism, which is slidably disposed inside the push sleeve, with one end near the guide block being polygonal and the other end placed in the second pressure relief chamber; a limiting hole is provided on the guide block corresponding to the position of the prism, and the end of the prism can be inserted into the limiting hole to prevent the guide block from rotating; an exhaust pipe, which corresponds to and is connected to the pressure relief channel, and the other end of the exhaust pipe is connected to the second pressure relief chamber; and a second elastic member, which is placed at the end of the prism away from the guide block, for pushing the end of the prism into the limiting hole and causing the prism to block the connection between the exhaust pipe and the second pressure relief chamber.

[0012] Preferably, the bending assembly further includes: an annular guide rail, which is fixedly fitted on the outside of the rotating sleeve; a push slider, which is slidably mounted on the side of the annular guide rail near the pneumatic actuator and is fixedly connected to the output end of the pneumatic actuator; the pneumatic actuator pushes the slider and the annular guide rail to make the rotating sleeve slide relative to the push sleeve.

[0013] Preferably, the bending mechanism further includes: a timing pulley, which is rotatably mounted inside the frame and fitted on the outside of the rotating sleeve, and can slide relative to the rotating sleeve and drive the rotating sleeve to rotate; a rotation drive component, which is fixedly mounted inside the frame, and a drive wheel is fixedly mounted on the outside of the output shaft; a timing belt is fitted between the drive wheel and the timing pulley.

[0014] Preferably, the bending assembly further includes: a fan-shaped boss, which is fixedly connected to the end of the push sleeve; a connecting notch, which is formed on the side of the guide block near the fan-shaped boss; the fan-shaped boss can be engaged in the connecting notch, so that the guide block is connected to the push sleeve and relatively fixed.

[0015] Preferably, the guide block includes: a fixing plate that can be installed at the end of the push sleeve; and fixing blocks that are symmetrically arranged and fixedly connected to the side of the fixing plate away from the push sleeve, with a gap reserved between the fixing blocks to allow the reinforcing bar to pass through.

[0016] Preferably, the bending assembly further includes: a sealing rod, which is slidably connected inside the push sleeve and corresponds one-to-one with the pressure relief channel; the end of the sealing rod can block the pressure relief channel; an elastic reset member is fixedly connected to one end of the sealing rod near the axis of the push sleeve, so that the other end of the sealing rod passes through the side wall of the push sleeve; and a sealing ring, which is fixedly connected to the end of the rotating sleeve and is used to block the gap between the rotating sleeve and the sliding sleeve.

[0017] The technical effects and advantages of this invention are as follows:

[0018] 1. This invention effectively solves the problem of cylinder malfunction caused by poor exhaust by setting up a first pressure relief chamber, a second pressure relief chamber, a pressure relief channel, a pull rod, and a prism. In use, when the first sleeve reaches its limit position, the pull rod is pulled to the second position. The end of the pull rod no longer blocks the first pressure relief pipe. Then, the gas at the end of the pneumatic actuator enters the first pressure relief chamber through the first pressure relief pipe and is discharged through the pressure relief channel. The gas pushes the prism to slide towards the side close to the second elastic element. When the prism slides to the third position, the gas in the second pressure relief chamber can enter the pressure relief channel, allowing the pneumatic actuator to exhaust normally and preventing the bent parts from getting stuck. This method also allows the equipment to continue working without stopping, and the equipment can be stopped for maintenance and cleaning only after the material tray is used up.

[0019] 2. This invention achieves the purpose of quickly changing bending dies by setting up a rotating sleeve, a prism, a limiting hole, a sealing rod, and an elastic reset component. By inflating the pneumatic pusher, the rotating sleeve slides relative to the pushing sleeve. The prism slides under pressure to the fourth position. At the same time, the sealing ring at the end of the rotating sleeve squeezes the end of the sealing rod, causing the sealing rod to block the pressure relief channel. Simultaneously, the end of the prism slides out from the limiting hole, and then the guide block can be removed, reducing equipment downtime. The two pre-installed positioning blocks can better maintain relative parallelism, ensuring the accuracy of the rebar bending angle.

[0020] 3. By setting up a first pressure relief chamber, a second pressure relief chamber, and a pressure relief channel, this invention increases the function of cleaning dust. The gas in the first and second pressure relief chambers can enter between the pushing sleeve and the rotating sleeve through the pressure relief channel and be discharged, preventing small metal particles generated during bending from affecting the movement of the rotating sleeve relative to the pushing sleeve. During use, the gap can also be cleaned intermittently to avoid equipment jamming and improve the stability of equipment operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the bending mechanism in this invention.

[0023] Figure 3 This is a schematic diagram showing the state of the rotating sleeve after it slides in this invention.

[0024] Figure 4 This is a cross-sectional view of the bending mechanism in this invention.

[0025] Figure 5 This is a schematic diagram showing the state of the pull rod in the second position in this invention.

[0026] Figure 6 This is a disassembly diagram of the bending mechanism in this invention.

[0027] Figure 7 This is a schematic diagram showing the state of the prism in the third position in this invention.

[0028] Figure 8 This is a schematic diagram of the prism in the fourth position in this invention.

[0029] Figure 9 This is a schematic diagram showing the location of the annular pressure relief chamber in this invention.

[0030] In the diagram: 1. Frame; 2. Conveying mechanism; 3. Shearing mechanism; 4. Bending mechanism; 5. Guide assembly; 501. Push sleeve; 502. Guide block; 5021. Fixed plate; 5022. Fixed block; 503. Pneumatic actuator; 504. First pressure relief chamber; 505. Second pressure relief chamber; 506. Pressure relief channel; 507. Pull rod; 508. First elastic element; 509. First pressure relief pipe; 510. Linear drive element; 511. Annular pressure relief chamber; 512. 6. Second pressure relief pipe; 6. Bending assembly; 601. Rotating sleeve; 602. Bending block; 603. Prism; 604. Limiting hole; 605. Exhaust pipe; 606. Second elastic element; 607. Annular guide rail; 608. Push slider; 609. Synchronous pulley; 610. Rotation drive element; 611. Drive wheel; 612. Synchronous belt; 613. Sector-shaped boss; 614. Connecting notch; 615. Sealing rod; 616. Elastic reset element; 617. Sealing ring. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] This invention provides, for example Figures 1 to 9 The CNC rebar bending machine shown includes a frame 1, a conveying mechanism 2, a shearing mechanism 3, and a bending mechanism 4 installed in the middle of the frame 1. A rebar straightening mechanism can also be installed as needed. The frame 1 forms the main frame of the equipment, along with the control panel and exterior components. The conveying mechanism 2 is used to convey the straightened rebar, and the shearing mechanism 3 is used to cut the rebar. Both the conveying mechanism 2 and the shearing mechanism 3 are existing technologies and will not be described in detail here. The bending mechanism 4 is located at the rear end of the conveying mechanism 2 and the shearing mechanism 3.

[0033] The bending mechanism 4 includes a guide component 5 and a bending component 6, both of which can slide relative to the panel of the frame 1 and intersect with the reinforcing bars, enabling bending operations in two directions. The guide component 5 includes a push sleeve 501, which is slidably connected to the middle of the frame 1; a guide block 502, which is detachably connected to the end of the push sleeve 501 and has a notch in the middle for guiding the extension of the reinforcing bars. The reinforcing bars enter the notch after passing through the conveying mechanism 2 and the shearing mechanism 3 in sequence, and the distance of its extension beyond the notch is determined by the conveying mechanism 2. The bending component 6 includes a rotating sleeve 601, which is rotatably fitted on the outside of the push sleeve 501 and can slide along the axis of the push sleeve 501; and a bending block 602, which is rotatably connected to the side of the rotating sleeve 601 near the guide block 502, and is placed on the same plane as the guide block 502 during bending operations. The rotating sleeve 601 rotates relative to the push sleeve 501, causing the bending block 602 to squeeze the reinforcing bars and cooperate with the guide block 502 to complete the bending of the reinforcing bars.

[0034] A pneumatic actuator 503 is fixedly connected to the outside of the push sleeve 501, and at least two are evenly arranged relative to the axis of the push sleeve 501. The output end of each pneumatic actuator 503 is movably connected to the rotating sleeve 601 to drive the rotating sleeve 601 to slide relative to the push sleeve 501. The pneumatic actuator 503 can be a component that achieves linear motion by inflating air, such as a cylinder. The gas input / output positions at both ends of the pneumatic actuator 503 are connected to pneumatic solenoid valves to control the remote movement of the pneumatic actuator 503. The pneumatic solenoid valves are existing technology and will not be described in detail here, nor are they shown in the figure. A first pressure relief chamber 504 and a second pressure relief chamber 505 are opened in the middle of the push sleeve 501. The first pressure relief chamber 504 is connected to one end of the pneumatic actuator 503, and the second pressure relief chamber 505 is connected to the middle of the push sleeve 501. 5 is connected to the other end of the pneumatic actuator 503, and both can be used to assist the movement of the pneumatic actuator 503; the middle part of the push sleeve 501 is also provided with a pressure relief channel 506, which is evenly distributed along the axis of the push sleeve 501. The first pressure relief chamber 504 and the second pressure relief chamber 505 are both connected to the pressure relief channel 506. The outlet of the pressure relief channel 506 is located between the push sleeve 501 and the rotating sleeve 601; the first pressure relief chamber 504 and the second pressure relief chamber 505 can relieve the pressure of the pneumatic actuator 503. The gas in the first pressure relief chamber 504 and the second pressure relief chamber 505 can enter between the push sleeve 501 and the rotating sleeve 601 through the pressure relief channel 506 and be discharged, so as to prevent the small metal particles generated during the bending process from affecting the movement of the rotating sleeve 601 relative to the push sleeve 501.

[0035] It should be noted that multiple pneumatic actuators 503 are connected in parallel, and their two ends are respectively connected to the two gas output ends of the pneumatic solenoid valve. The input end of the pneumatic solenoid valve is connected to an air pump. When the pneumatic solenoid valve inflates one end of the pneumatic actuator 503, the other end of the pneumatic actuator 503 exhausts air through the pneumatic solenoid valve. However, moisture, oil, and dust impurities in the compressed air are prone to accumulate in the exhaust port of the pneumatic solenoid valve and its nearby pipeline, forming viscous substances or even solid blockages.

[0036] Specifically, the guiding assembly 5 further includes: a pull rod 507, which is slidably disposed inside the first pressure relief chamber 504 and passes through the end of the push sleeve 501; a first elastic element 508 is fitted on the outer side of the pull rod 507, and the other end of the first elastic element 508 abuts against the end of the first pressure relief chamber 504; a first pressure relief pipe 509, one end of which is connected to one end of the pneumatic pusher 503, and the other end of which is connected to the first pressure relief chamber 504; gas can enter the first pressure relief chamber 504 through the first pressure relief pipe 509 at the end of the pneumatic pusher 503; the first elastic element 508 pushes... The pull rod 507 blocks the connection between the first pressure relief pipe 509 and the first pressure relief chamber 504, preventing gas in the pneumatic actuator 503 from entering the first pressure relief chamber 504. The linear drive 510 is fixedly connected inside the frame 1, and its output end is fixedly connected to the end of the pull rod 507. It is used to drive the push sleeve 501 to slide relative to the frame 1. The linear drive 510 can be a linear motor or hydraulic cylinder or other components that can achieve linear motion and can accurately control the direction and distance of motion. It is existing technology and is electrically connected to a corresponding controller and energy source during use. It will not be described in detail here.

[0037] During use, the linear drive 510 pulls the push sleeve 501 to slide via the pull rod 507, causing the pull rod 507 to reach the first position. At the same time, the first elastic element 508 does not deform, causing the push sleeve 501 and the rotating sleeve 601 to slide towards the side closer to the linear drive 510, maintaining the blocked state of the first pressure relief pipe 509. When the exhaust of the pneumatic actuator 503 fails, after the linear drive 510 pulls the pull rod 507 to the first position, the first sleeve reaches the limit position. Then, the pull rod 507 is pulled to the second position. At this time, the first elastic element 508 is deformed under pressure, and the end of the pull rod 507 no longer blocks the first pressure relief pipe 509. Subsequently, the gas at the end of the pneumatic actuator 503 enters the first pressure relief chamber 504 through the first pressure relief pipe 509 and is discharged through the pressure relief channel 506. At this time, the output end is reset by injecting gas into the other end of the pneumatic actuator 503.

[0038] It should be noted that during use, the linear drive component 510 can be controlled to intermittently pull the tie rod 507 to the second position, so as to clean the gap between the rotating sleeve 601 and the pushing sleeve 501 in a timely manner, and prevent small debris generated by the bending of the steel bar during the bending process from entering the gap, causing the equipment to jam and affecting the stability of the equipment operation.

[0039] More specifically, the guide assembly 5 also includes: an annular pressure relief chamber 511, which is located inside the push sleeve 501 and communicates with the side wall of the second pressure relief chamber 505, and its communication position is staggered with the pressure relief channel 506; a second pressure relief pipe 512, one end of which is connected to the end of the pneumatic pusher 503 away from the first pressure relief chamber 504, and the other end is connected to the annular pressure relief chamber 511. When the pneumatic pusher 503 is inflated at the end corresponding to the first pressure relief pipe 509, the gas can enter the annular pressure relief chamber 511 to maintain the same air pressure.

[0040] Specifically, the bending mechanism 4 further includes a prism 603, which is slidably disposed inside the push sleeve 501. One end of the prism 603 near the guide block 502 is polygonal, and the other end is placed in the second pressure relief chamber 505. The end of the prism 603 divides the second pressure relief chamber 505 into two parts, and the two parts are relatively sealed. The part near the polygonal end communicates with the annular pressure relief chamber 511. A limiting hole 604 is provided on the guide block 502 corresponding to the position of the prism 603. The end of the prism 603 can be inserted into the limiting hole 604 to prevent the guide block 502 from rotating. The prism 603 can slide out of the limiting hole 604 to enable quick replacement of the guide block 502; the exhaust pipe 605 corresponds to and is connected to the pressure relief channel 506, and the other end of the exhaust pipe 605 is connected to the second pressure relief chamber 505, with the connection position located at the part of the prism 603 that is far away from the polygonal end after being divided; the second elastic member 606 is placed at the end of the prism 603 that is far away from the guide block 502, and is used to push the end of the prism 603 into the limiting hole 604, and to block the connection between the exhaust pipe 605 and the second pressure relief chamber 505.

[0041] When the pneumatic actuator 503 cannot properly exhaust air at one end corresponding to the second pressure relief pipe 512, air is supplied to the side of the pneumatic actuator 503 corresponding to the first pressure relief pipe 509, increasing the pressure inside the annular pressure relief chamber 511. At this time, the gas pushes the prism 603 to slide towards the side close to the second elastic member 606, causing the second elastic member 606 to deform under pressure. When the prism 603 slides to the third position, the gas in the second pressure relief chamber 505 can enter the pressure relief channel 506, allowing the pneumatic actuator 503 to exhaust air normally. However, when the pressure inside the second pressure relief pipe 512 decreases, the second elastic member 606 pushes the prism 603 to reset, disconnecting the annular pressure relief chamber 511 from the pressure relief channel 506.

[0042] It should be noted that when the prism 603 is in the third position, the end of the prism 603 does not completely slide out of the limiting hole 604, and the guide block 502 is still fixed relative to the pushing sleeve 501.

[0043] More specifically, the bending assembly 6 also includes: an annular guide rail 607, which is fixedly fitted on the outside of the rotating sleeve 601; and a push slider 608, which is slidably mounted on the side of the annular guide rail 607 near the pneumatic actuator 503 and is fixedly connected to the output end of the pneumatic actuator 503; the pneumatic actuator 503 pushes the slider 608 and the annular guide rail 607 to make the rotating sleeve 601 slide relative to the push sleeve 501.

[0044] In use, the output end of the pneumatic actuator 503 pulls the push slider 608, causing the rotating sleeve 601 to slide relative to the push sleeve 501. The bending block 602 and the rebar / guide block 502 are then placed on different planes. After the rotating sleeve 601 is rotated by a certain angle, the pneumatic actuator 503 makes the bending block 602 and the rebar / guide block 502 place on the same plane again. Then, the rotation of the rotating sleeve 601 bends the rebar. By adjusting the position of the bending block 602 relative to the rebar before bending, the purpose of bending the rebar in different directions can be achieved.

[0045] Specifically, the bending mechanism 4 also includes: a synchronous pulley 609, which is rotatably mounted inside the frame 1 and fitted on the outside of the rotating sleeve 601, and can slide relative to the rotating sleeve 601 and drive the rotating sleeve 601 to rotate; a rotation drive component 610, which is fixedly mounted inside the frame 1, and a drive wheel 611 is fixedly mounted on the outside of the output shaft. The rotation drive component 610 can be a component that can achieve precise control of the rotation angle, such as a stepper motor. Stepper motors are existing technology and will not be described in detail here. When in use, the stepper motor is electrically connected to a corresponding controller and power supply; a synchronous belt 612 is fitted between the drive wheel 611 and the synchronous pulley 609.

[0046] During operation, the rotation drive 610 causes the synchronous pulley 609 to rotate via the drive wheel 611 and the synchronous belt 612. The rotation angle of the rotating sleeve 601 is precisely controlled by controlling the rotation angle of the rotation drive 610.

[0047] More specifically, the bending assembly 6 also includes: a fan-shaped boss 613, which is fixedly connected to the end of the push sleeve 501, and the fan-shaped boss 613 has a T-shaped cross-section; a connecting notch 614, which is opened on the side of the guide block 502 near the fan-shaped boss 613, and the connecting notch 614 has a corresponding T-shaped structure corresponding to the position of the fan-shaped boss 613; the fan-shaped boss 613 can be fastened in the connecting notch 614, so that the guide block 502 is connected to the push sleeve 501 and relatively fixed.

[0048] In use, the connecting notch 614 is aligned with the fan-shaped boss 613. Then, the guide block 502 is rotated so that the T-shaped part of the connecting notch 614 aligns with the fan-shaped boss 613, thus completing the connection between the guide block 502 and the push sleeve 501. Then, the prism 603 is inserted into the limiting hole 604 so that the guide block 502 cannot rotate relative to the push sleeve 501.

[0049] Specifically, when it is necessary to disassemble / replace the guide block 502, air is injected into the side of the pneumatic pusher 503 corresponding to the second pressure relief chamber 505 to increase its internal pressure and push the prism 603 to the fourth position. At this time, some gas will be discharged through the pressure relief channel 506, and the end of the prism 603 will slide out from the limiting hole 604. Then the guide block 502 can be removed.

[0050] More specifically, the guide block 502 includes: a fixed plate 5021, which can be installed at the end of the push sleeve 501, and a limiting hole 604 is opened on the side of the fixed plate 5021 close to the push sleeve 501; and a fixed block 5022, which is symmetrically arranged and fixedly connected to the side of the fixed plate 5021 away from the push sleeve 501, and the fixed blocks 5022 installed on the same fixed plate 5021 are of the same size.

[0051] The fixing blocks 5022 at the ends of different guide blocks 502 can be set with different specifications, and the specifications of the guide blocks 502 installed on the same fixing plate 5021 are symmetrical. In order to cope with the bending requirements of different arc angles, multiple guide blocks 502 can be used, and the specifications of the fixing blocks 5022 installed for each guide block 502 are different. They can be replaced as needed during use. Guide blocks 502 of the same specification also need to be quickly replaced due to wear and other issues during use. The quick-release design makes replacement more convenient, reduces equipment downtime, and ensures that the corresponding two fixing blocks 5022 are relatively parallel, ensuring that the rebar can pass through the gap normally. A gap is reserved between the fixing blocks 5022 to allow the rebar to pass through. This gap should be larger than the diameter of the rebar. While ensuring that the rebar can pass through the gap normally, the fixing blocks 5022 are closer to the rebar, reducing the stress on the unbent end during bending.

[0052] Specifically, the bending assembly 6 also includes: a blocking rod 615, which is slidably connected inside the push sleeve 501 and corresponds one-to-one with the pressure relief channel 506; the end of the blocking rod 615 can be inserted into the pressure relief channel 506 to block it and reduce the gas flow rate of the pressure relief channel 506; an elastic reset member 616 is fixedly connected to one end of the blocking rod 615 near the axis of the push sleeve 501, so that the other end of the blocking rod 615 passes through the side wall of the push sleeve 501, and the elastic reset member 616 ensures that the blocking rod 615 does not block the pressure relief channel 506 in the initial state; and a sealing ring 617, which is fixedly connected to the end of the rotating sleeve 601 to block the gap between the rotating sleeve 601 and the sliding sleeve, reducing the entry of fine metal particles generated during external bending into the frame 1.

[0053] More specifically, during the disassembly / replacement of the guide block 502, air is injected into the pneumatic actuator 503 to cause the rotating sleeve 601 to slide relative to the pushing sleeve 501. The prism 603 is pressed and slides to the fourth position. At the same time, the sealing ring 617 at the end of the rotating sleeve 601 squeezes the end of the sealing rod 615, causing the sealing rod 615 to block the pressure relief channel 506. At this time, the pressure in the second pressure relief chamber 505 increases, which can reduce the amount of gas injected into the pneumatic actuator 503 and reduce losses. After the replacement is completed, the rotating sleeve 601 is reset relative to the pushing sleeve 501, and the elastic reset member 616 pushes the sealing rod 615 to reset, so that the gas in the second pressure relief chamber 505 is discharged through the pressure relief channel 506.

[0054] In summary, when bending steel bars, the straightened steel bars are first inserted into the equipment, so that the conveying mechanism 2 can push the steel bars into the shearing mechanism 3 and the bending mechanism 4, and can accurately control the movement distance of the steel bars. The controller sets the required bending shape and the length and angle of each edge.

[0055] After the setting is completed, the conveying mechanism 2 pushes the steel bar through the notch of the guide block 502 and places it on one side of the bending block 602. After reaching the set distance, the rotating drive 610 causes the rotating sleeve 601 to rotate relative to the pushing sleeve 501 through the synchronous belt 612. During this process, the steel bar is bent under pressure through the bending block 602 and the guide block 502. After the bending is completed, the rotating sleeve 601 is reset. Then, according to the set second bending side length, the conveying mechanism 2 continues to push the steel bar to move. After reaching a suitable distance, the steel bar bends again when passing through the bending block 602 and the guide block 502.

[0056] If the bending direction is changed, after the previous bending is completed, the pneumatic pusher 503 makes the rotating cylinder slide relative to the pusher sleeve 501, adjusting the bending block 602 and the rebar / guide block 502 to be placed on different planes. Then, the rotating sleeve 601 is rotated at a certain angle, so that the bending block 602 is placed on the other side of the rebar. Then, the pneumatic pusher 503 makes the bending block 602 and the rebar / guide block 502 be placed on the same plane. After the conveying mechanism 2 pushes the rebar to move an appropriate distance, the rotating sleeve 601 is rotated in the opposite direction to complete the bending action of the rebar in the other direction.

[0057] After the reinforcing bar is bent into a hoop, the linear drive component 510 pulls and pushes the sleeve 501 to slide, so that it reaches the first position. The guide block 502 / bending block are not placed on the same plane as the reinforcing bar. Then, the shearing mechanism 3 cuts and separates the reinforcing bar hoop from the unbent reinforcing bar. After shearing, the push sleeve 501 is reset.

[0058] When the pneumatic actuator 503 cannot be pushed or retracted, when air is introduced into one side of the pneumatic actuator 503 corresponding to the second pressure relief pipe 512, the other end of the pneumatic actuator 503 cannot properly exhaust air. Therefore, the pneumatic actuator 503 cannot pull the rotating sleeve 601 to retract. At this time, the linear drive 510 pulls the lever 507 to the second position, the first elastic element 508 deforms under pressure, and the end of the lever 507 no longer blocks the first pressure relief pipe 509. Subsequently, the gas at the end of the pneumatic actuator 503 enters the first pressure relief chamber 504 through the first pressure relief pipe 509 and is discharged through the pressure relief channel 506. At this time, by introducing air into the other side of the pneumatic actuator 503... Gas is injected into the output end to achieve the purpose of resetting the output end; when gas is injected into the side of the pneumatic pusher 503 corresponding to the first pressure relief pipe 509, the other end of the pneumatic pusher 503 cannot exhaust normally, so the pneumatic pusher 503 cannot push the rotating sleeve 601 to reset. At this time, gas is injected into the side of the pneumatic pusher 503 corresponding to the first pressure relief pipe 509 to increase the pressure in the annular pressure relief chamber 511, causing the second elastic member 606 to deform under pressure. When the prism 603 slides to the third position, the gas in the second pressure relief chamber 505 can enter the pressure relief channel 506, so that the pneumatic pusher 503 can exhaust normally and complete the purpose of pushing the rotating sleeve 601.

[0059] When it is necessary to change the size of different bending arcs or adapt to steel bars of different diameters, air is injected into the side of the pneumatic pusher 503 corresponding to the second pressure relief chamber 505. At the same time, the sealing ring 617 at the end of the rotating sleeve 601 squeezes the end of the sealing rod 615, causing the sealing rod 615 to block the pressure relief channel 506. The air pressure pushes the prism 603 to the fourth position, and at the same time, the end of the prism 603 slides out from the limiting hole 604. Then, the guide block 502 can be rotated and removed. During installation, the connecting notch 614 is aligned with the fan-shaped boss 613. Then, the guide block 502 is rotated so that the T-shaped part of the connecting notch 614 aligns with the fan-shaped boss 613, completing the connection between the guide block 502 and the pusher sleeve 501. Then, the prism 603 is inserted into the limiting hole 604 so that the guide block 502 cannot rotate relative to the pusher sleeve 501.

[0060] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A CNC rebar bending machine, comprising a frame, a conveying mechanism, a shearing mechanism, and a bending mechanism installed in the middle of the frame, characterized in that: The bending mechanism includes a guide component and a bending component, both of which are capable of sliding relative to the panel of the frame. The guide assembly includes a push sleeve that is slidably connected to the middle of the frame; A guide block, which is detachably connected to the end of the push sleeve, and has a notch in the middle for guiding the extension of the reinforcing bar; The bending assembly includes a rotating sleeve that is fitted around the outside of the push sleeve and can slide along the axis of the push sleeve; The bending block is rotatably connected to the side of the rotating sleeve near the guide block; The rotating sleeve drives the sleeve to rotate, causing the bending block and the guide block to cooperate in bending the steel bar. A pneumatic actuator is fixedly connected to the outside of the push sleeve, and at least two are evenly arranged relative to the axis of the push sleeve. The output end of each pneumatic actuator is movably connected to the rotating sleeve to drive the rotating sleeve to slide relative to the push sleeve. The middle part of the push sleeve is provided with a first pressure relief chamber and a second pressure relief chamber. The first pressure relief chamber is connected to one end of the pneumatic pusher, and the second pressure relief chamber is connected to the other end of the pneumatic pusher. The middle part of the push sleeve is also provided with a pressure relief channel, and multiple channels are evenly distributed along the axis of the push sleeve. The first pressure relief chamber and the second pressure relief chamber are connected to the pressure relief channel, and the outlet of the pressure relief channel is located between the push sleeve and the rotating sleeve. The first and second pressure relief chambers can relieve pressure on the pneumatic actuators. The guiding assembly further includes: a pull rod, which is slidably disposed inside the first pressure relief chamber and passes through the end of the push sleeve, and a first elastic element is fitted on the outside of the pull rod; The first pressure relief pipe has one end connected to one end of the pneumatic actuator and the other end connected to the first pressure relief chamber; The first elastic element pushes the pull rod to block the connection between the first pressure relief pipe and the first pressure relief chamber; A linear drive unit is fixedly connected inside the frame, and its output end is fixedly connected to the end of the pull rod, for driving the push sleeve to slide relative to the frame; An annular pressure relief chamber is located inside the push sleeve and communicates with the side wall of the second pressure relief chamber. The second pressure relief pipe has one end connected to the end of the pneumatic actuator away from the first pressure relief chamber, and the other end connected to the annular pressure relief chamber. The bending mechanism further includes a prism, which is slidably disposed inside the push sleeve, with one end near the guide block being polygonal and the other end placed in the second pressure relief chamber; A limiting hole is provided on the guide block at the position corresponding to the prism, and the end of the prism can be inserted into the limiting hole to prevent the guide block from rotating. The exhaust pipe corresponds to and is connected to the pressure relief channel, and the other end of the exhaust pipe is connected to the second pressure relief chamber. The second elastic element is located at the end of the prism away from the guide block, and is used to push the end of the prism into the limiting hole, and to make the prism block the exhaust pipe and connect it with the second pressure relief chamber.

2. The CNC rebar bending machine according to claim 1, characterized in that, The bending component also includes: An annular guide rail is fixedly mounted on the outside of a rotating sleeve; The push slider is slidably mounted on the side of the annular guide rail near the pneumatic actuator and is fixedly connected to the output end of the pneumatic actuator; The pneumatic actuator pushes the slider against the annular guide rail, causing the rotating sleeve to slide relative to the push sleeve.

3. A CNC rebar bending machine according to claim 1, characterized in that, The bending mechanism further includes: The synchronous pulley is rotatably mounted inside the frame and fitted onto the outside of the rotating sleeve, allowing it to slide relative to the rotating sleeve and drive the rotating sleeve to rotate. The rotation drive is fixedly installed inside the frame, and a drive wheel is fixedly installed on the outside of the output shaft; A timing belt is fitted between the drive wheel and the timing pulley.

4. A CNC rebar bending machine according to claim 1, characterized in that, The bending component also includes: A fan-shaped boss is fixedly connected to the end of the push sleeve; The connecting notch is located on the side of the guide block near the fan-shaped boss; The fan-shaped boss can be engaged in the connection notch to connect the guide block and the push sleeve and fix them relatively.

5. A CNC rebar bending machine according to claim 1, characterized in that, The boot block includes: A fixed disc, which can be mounted on the end of the push sleeve; The fixing blocks are symmetrically arranged and fixedly connected to the side of the fixing plate away from the pushing sleeve. A gap is reserved between the fixing blocks to allow the reinforcing bars to pass through.

6. A CNC rebar bending machine according to claim 1, characterized in that, The bending component also includes: The sealing rod is slidably connected inside the push sleeve and corresponds one-to-one with the pressure relief channel; The end of the sealing rod can block the pressure relief channel; The end of the sealing rod near the axis of the push sleeve is fixedly connected to an elastic reset component, so that the other end of the sealing rod passes through the side wall of the push sleeve; A sealing ring, which is fixedly connected to the end of the rotating sleeve, is used to seal the gap between the rotating sleeve and the sliding sleeve.

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