Hoop bending machine head position locking device and reinforcing steel bar hoop bending machine head

Abstract

The utility model relates to the field of reinforcing steel bar processing, in particular to a hoop bending machine head position locking device and a reinforcing steel bar hoop bending machine head, the hoop bending machine head position locking device comprises a limiting unit, the reinforcing steel bar hoop bending machine head is arranged on a sliding frame in a sliding mode through the limiting unit, and the reinforcing steel bar hoop bending machine head position locking device further comprises a locking positioning unit, a second positioning unit and a walking unit, the locking and positioning unit is arranged below a mounting bottom plate of the rebar hoop bending machine head in the middle of the limiting unit, the walking unit is arranged on the side portion of the rebar hoop bending machine head and drives the rebar hoop bending machine head to advance on the sliding frame, and the second positioning units are distributed on the two sides of the limiting unit so as to reinforce limiting of the limiting unit. The steel bar hoop bending machine head is positioned twice through the locking positioning unit and the second positioning unit, small-amplitude displacement during operation of the steel bar hoop bending machine head is effectively prevented, the steel bar hoop bending precision is improved, meanwhile, the oil cylinder is locked through cooperation of the reset unit, the steel bar hoop bending machine head is rapidly restored to a movable state, and the adjusting efficiency of the steel bar hoop bending machine head is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of steel bar processing, specifically relates to a hoop bending machine head position locking device and steel bar hoop bending machine head. BACKGROUND

[0002] The steel bar hoop bending machine is a kind of mechanical equipment specially used for bending and processing steel bars. It belongs to a kind of steel bar processing machinery, and is mainly used for bending steel bars into specific shapes, such as hoop bars, to be used for reinforcing and connecting concrete structures of buildings, bridges and the like.

[0003] In the prior art, the steel bar hoop bending machine needs to be moved to adjust the position of steel bar hoop bending when working. When moving, the locking cylinder at the bottom cooperates with the pressing block to press down to the surface of the sliding rail, so as to position the steel bar hoop bending machine head after moving. When moving again, since the locking cylinder is a one-way cylinder, it can only rely on the weight of the steel bar hoop bending machine head to press down as a whole, which causes the steel bar hoop bending machine head to be unable to quickly recover to a movable state. In addition, the existing steel bar hoop bending machine head only has a locking cylinder and does not have another positioning mechanism, so the positioning effect is poor. When bending the steel bar, small displacement easily occurs, which affects the steel bar bending precision. Therefore, how to overcome the above technical problems and defects becomes a key problem to be solved. UTILITY MODEL CONTENTS

[0004] The application aims to overcome the defects described in the background art, so as to realize a hoop bending machine head position locking device capable of quickly recovering to a movable state and having strong positioning effect, and a steel bar hoop bending machine head provided with the hoop bending machine head position locking device, to solve the problems that the steel bar hoop bending machine head cannot quickly recover to a movable state before moving, does not have another positioning mechanism, the positioning effect is poor, and the steel bar bending precision is affected.

[0005] To achieve the above application purpose, the technical scheme of the utility model is as follows:

[0006] A hoop bending machine head position locking device is installed on a steel bar hoop bending machine head. The hoop bending machine head position locking device comprises a limiting unit, and the steel bar hoop bending machine head is slidably arranged on a sliding frame through the limiting unit. The hoop bending machine head position locking device further comprises a locking positioning unit, a second positioning unit and a walking unit. The locking positioning unit is arranged below the mounting bottom plate of the steel bar hoop bending machine head at the intermediate position of the limiting unit. The walking unit is arranged at the side of the steel bar hoop bending machine head and drives it to travel on the sliding frame. The second positioning unit is arranged on both sides of the limiting unit, so as to strengthen the limiting of the limiting unit.

[0007] Specifically, the locking and positioning unit includes a reset unit, which includes a pressure plate, a bolt, and a reset spring A. The pressure plate has limit holes at its four corners. The bolt passes through the limit holes at the bottom of the pressure plate and is threaded to the mounting base plate of the rebar bending machine head. The reset spring A is located in the limit hole outside the bolt.

[0008] In addition, the locking and positioning unit also includes a locking cylinder and a buffer sleeve. The fixed end of the locking cylinder is embedded in the mounting base plate of the rebar bending machine head. The free end of the locking cylinder is connected to the pressure plate through the buffer sleeve. The buffer sleeve is embedded in the middle of the top of the pressure plate. The pressure plate is set below the mounting base plate of the rebar bending machine head through a reset unit.

[0009] In the aforementioned head locking device for bending machines, the bolt is a semi-threaded hexagonal socket head cap bolt.

[0010] The bottom of the buffer sleeve and the contact part with the pressure plate are made of deformable rubber material, and the bottom surface of the pressure plate is compatible with the top surface of the sliding frame.

[0011] Specifically, a rubber pad is provided on the bottom surface of the pressure plate.

[0012] In the above-mentioned clamping device for the head position of the bending machine, the limiting unit includes a main groove and an auxiliary pulley. The main groove is symmetrically arranged on the lower part of the mounting base plate of the bending machine head on both sides of the pressure plate. The main groove is provided with a limiting groove that matches the specifications of the slide rails on both sides of the sliding frame. An auxiliary pulley is embedded in the upper part of the limiting groove. The auxiliary pulley is a rolling wheel.

[0013] In the aforementioned head locking device for the bending machine, when the main groove body slides on the slide rail through the limiting groove and the slide rail, the auxiliary pulley rolls on the slide rail.

[0014] In the aforementioned head locking device for the rebar bending machine, the traveling unit includes a traveling gear shaft, a toothed plate, and a motor protective box. The motor protective box is located on the side of the mounting base plate of the rebar bending machine head. A traveling motor is installed inside the motor protective box. The rotating shaft of the traveling motor passes through the limiting unit and drives the traveling gear shaft. The toothed plate is located at the bottom of the sliding frame, and the traveling gear shaft meshes with the toothed plate.

[0015] The specifications of the sliding frame are compatible with the specifications of the main groove.

[0016] In the aforementioned head locking device for the bending machine, a second positioning unit is also provided on the sliding frame. The second positioning unit includes a mounting angle plate, a sliding support plate, and an electromagnet. The mounting angle plate is fixedly installed on the side of the limiting unit. A limiting slide rod is integrally or separately installed on the upper part of the sliding support plate. The limiting slide rod is slidably connected to the mounting angle plate. The electromagnet is installed at the bottom of the mounting angle plate on the opposite side of the limiting slide rod. An adsorption block is provided on the sliding support plate. The adsorption block and the electromagnet are vertically aligned.

[0017] In addition, a return spring B is provided on the outside of the limiting slide rod between the sliding tray and the mounting corner plate, and a positioning protrusion is provided on one end of the opposite side of the suction block of the sliding tray. A positioning toothed plate is provided on the sliding frame corresponding to the positioning protrusion, and the positioning toothed plate is adapted to the specifications of the positioning protrusion.

[0018] Specifically, four second positioning units are provided, arranged in pairs on the side of the limiting unit.

[0019] A rebar bending machine head, the rebar bending machine head including the above-mentioned bending machine head position locking device.

[0020] Meanwhile, a positioning plate is provided on one side of the upper part of the mounting base plate of the rebar bending machine head. The rebar bending machine head also includes a gearbox, a bending swing arm, a drive cylinder, and a drive hydraulic cylinder. The gearbox is located on the mounting base plate opposite the positioning plate, and the drive cylinder is located on the side of the gearbox. The free end of the drive cylinder passes through the gearbox and is aligned with the positioning through hole of the positioning plate. The drive hydraulic cylinder drives and connects to the bending swing arm.

[0021] In the aforementioned rebar bending machine head, the drive cylinder is mounted on the mounting base plate at the bottom of the gearbox, and a rack sleeve is provided on the free end of the drive cylinder, which is connected to the bending swing arm.

[0022] Compared with the prior art, the hoop bending machine head position locking device of this utility model and the rebar hoop bending machine head equipped with the hoop bending machine head position locking device have at least the following beneficial effects:

[0023] The present invention relates to a rebar bending machine head locking device, which performs primary positioning of the rebar bending machine head through a locking positioning unit and secondary positioning through a second positioning unit. This device has strong positioning capability and can ensure strong stability of the rebar bending machine head when bending rebar through two positioning operations, effectively preventing small displacements during operation and improving the accuracy of rebar bending.

[0024] The locking device for the head of the rebar bending machine of this utility model, through the cooperation of the reset unit and the locking cylinder, enables the locking cylinder to complete the release of pressure more quickly, thereby allowing the head of the rebar bending machine to quickly return to a movable state, effectively improving the adjustment efficiency of the head of the rebar bending machine. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the assembly structure of the head locking device of the rebar bending machine installed on the head of the rebar bending machine according to this utility model;

[0026] Figure 2 This is a schematic diagram of the bottom structure of the head locking device of the bending machine of this utility model after it is separated from the sliding frame;

[0027] Figure 3 This is an exploded structural diagram of the head locking device of the bending hoop machine according to this utility model;

[0028] Figure 4 This is a schematic diagram showing the installation position of the bolts and return spring A after removing the pressure plate in the head locking device of the bending machine of this utility model;

[0029] Figure 5 This is a schematic diagram of the installation position of the unloading and traveling unit of the head locking device of the bending machine of this utility model;

[0030] Figure 6 yes Figure 5 A magnified schematic diagram of the structure at point A in the middle.

[0031] In the picture:

[0032] 1-Limiting unit: 101-Main groove; 111-Limiting groove; 102-Auxiliary pulley;

[0033] 2-Locking and positioning unit: 201-Reset unit;

[0034] 211-Pressure plate, 212-Bolt, 213-Reset spring A, 214-Limit hole, 215-Rubber pad;

[0035] 202 - Locking cylinder; 203 - Buffer sleeve;

[0036] 3-Travel unit: 301-Travel gear shaft, 302-Gear plate, 303-Motor protective box;

[0037] 4-Sliding bracket: 401-Slide rail;

[0038] 5. Install the base plate;

[0039] 6-Second positioning unit: 601-Mounting angle plate, 602-Sliding support plate, 603-Electromagnet, 604-Limiting slide bar, 605-Suction block, 606-Reset spring B, 607-Positioning protrusion, 608-Positioning toothed plate;

[0040] 7-Positioning plate; 8-Gearbox; 9-Bent hoop swing arm; 10-Drive cylinder; 11-Drive hydraulic cylinder. Detailed Implementation

[0041] The following description, in conjunction with the accompanying drawings and specific embodiments, provides a more detailed account of the locking device for the head of the rebar bending machine and the head of the rebar bending machine of this utility model.

[0042] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] This embodiment discloses a rebar bending machine head position locking device that can quickly restore its movable state and has a strong positioning effect, as well as a rebar bending machine head equipped with the rebar bending machine head position locking device. This solves the problems of the rebar bending machine head not being able to quickly return to a movable state before movement, lacking an additional positioning mechanism, resulting in poor positioning effect and affecting the accuracy of rebar bending. See also... Figure 1 It mainly includes a limiting unit 1. The head of the rebar bending machine is slidably mounted on the sliding frame 4 through the limiting unit 1. The sliding mounting facilitates the overall movement and adjustment of the head of the rebar bending machine along the sliding frame 4.

[0044] For details, see Figure 1 The head locking device of the rebar bending machine further includes a locking and positioning unit 2 and a traveling unit 3. The locking and positioning unit 2 is located below the mounting base plate 5 of the rebar bending machine head at the middle position of the limiting unit 1. The locking and positioning unit 2 cooperates with the sliding frame 4 to lock the position of the rebar bending machine head. In this embodiment, the traveling unit 3 is located on the side of the rebar bending machine head and is used to drive the entire rebar bending machine head to move on the sliding frame 4. See the following for details.

[0045] To limit the movement of the rebar bending machine head, see [reference needed]. Figure 2The limiting unit 1 includes a main groove 101 and an auxiliary pulley 102. The main groove 101 is symmetrically arranged on the lower part of the mounting base plate 5 of the rebar bending machine head on both sides of the pressure plate 211. The main groove 101 is provided with a limiting groove 111 that matches the specifications of the slide rails 401 on both sides of the sliding frame 4. The main groove 101 is slidably mounted on the slide rails 401 on both sides of the sliding frame 4 through the limiting groove 111. The auxiliary pulley 102 is embedded above the limiting groove 111. The auxiliary pulley 102 is a rolling wheel.

[0046] In this embodiment, when the main groove 101 slides on the slide rail 401 through the limiting groove 111, the auxiliary pulley 102 rolls on the slide rail 401. The auxiliary pulley 102 can reduce the friction between the slide rail 401 and the limiting groove 111, thereby making its movement smoother.

[0047] To drive the rebar bending machine to move, see [link to relevant documentation]. Figure 5 The traveling unit 3 includes a traveling gear shaft 301, a toothed plate 302, and a motor protective box 303. The motor protective box 303 is located on the side of the mounting base plate 5 of the rebar bending machine head, and a traveling motor is housed within it. The motor protective box 303 protects the motor. The rotating shaft of the traveling motor passes through the limiting unit 1 and drives the traveling gear shaft 301. The toothed plate 302 is located at the bottom of the sliding frame 4, and the traveling gear shaft 301 meshes with the toothed plate 302. Through the engagement of the traveling gear shaft 301 and the toothed plate 302, the rebar bending machine head moves along the sliding frame 4 in conjunction with the main groove 101 and the sliding frame 4.

[0048] The specifications of the sliding frame 4 are compatible with the specifications of the main groove 101.

[0049] To lock the position of the rebar bending machine head, see [link / reference]. Figure 3 The locking and positioning unit 2 further includes a locking cylinder 202 and a buffer sleeve 203. The fixed end of the locking cylinder 202 is embedded in the mounting base plate 5 of the rebar bending machine head. The free end of the locking cylinder 202 is connected to the pressure plate 211 through the buffer sleeve 203. By applying pressure to the buffer sleeve 203 through the locking cylinder 202, the pressure plate 211 is pressed against the sliding frame 4, thereby locking the position of the rebar bending machine head. The buffer sleeve 203 is embedded in the middle of the top of the pressure plate 211.

[0050] The pressure plate 211 is mounted below the mounting base plate 5 of the rebar bending machine head via a reset unit 201. The reset unit 201 allows the pressure plate 211 to be quickly reset when it is retracted by the locking cylinder 202.

[0051] In this embodiment, the bolt 212 is a semi-threaded hexagonal socket head cap screw. Additionally, to prevent excessive pressure from the locking cylinder, the bottom of the buffer sleeve 203, in contact with the pressure plate 211, is made of deformable rubber. By making the bottom of the buffer sleeve 203 a deformable rubber material, excessive pressure from the locking cylinder 202 can be effectively prevented from damaging the pressure plate. The bottom surface of the pressure plate 211 is compatible with the top surface of the sliding frame 4.

[0052] In addition, a rubber pad 215 is provided on the bottom surface of the pressure plate 211. By providing the rubber pad 215, the friction between the bottom of the pressure plate and the sliding frame 4 is increased, thereby further enhancing its positioning performance.

[0053] To achieve rapid reset of the pressure plate, see [link / reference]. Figure 3 , Figure 4 The locking and positioning unit 2 includes a reset unit 201. The reset unit 201 includes a pressure plate 211, a bolt 212, and a reset spring A213. The pressure plate 211 has limit holes 214 at its four corners. The bolt 212 passes through the limit holes 214 from the bottom of the pressure plate 211 and is threaded to the mounting base plate 5 of the rebar bending machine head. The reset spring A213 is disposed in the limit hole 214 outside the bolt 212.

[0054] With the above structure, when the head of the rebar bending machine moves, the locking cylinder 202 releases pressure and at the same time, the return spring A213 applies an upward force to the pressure plate, thereby driving the pressure plate 211 and the buffer sleeve 203 to apply upward pressure to the locking cylinder 202, thus accelerating the pressure release process of the locking cylinder 202 and speeding up the pressure plate reset process.

[0055] To further ensure the stability of the rebar bending machine head and prevent small-amplitude displacement during rebar bending, please refer to... Figure 6 The second positioning unit 6 includes a mounting angle plate 601, a sliding support plate 602, and an electromagnet 603. The mounting angle plate 601 is fixedly disposed on the side of the limiting unit, and is used to mount the electromagnet 603 and limit the movement of the limiting slide rod 604. The upper part of the sliding support plate 602 is integrally or separately provided with the limiting slide rod 604. The limiting slide rod 604 is slidably connected to the mounting angle plate 601. The electromagnet 603 is disposed at the bottom of the mounting angle plate 601 on the opposite side of the limiting slide rod 604. An adsorption block 605 is disposed on the sliding support plate 602. The adsorption block 605 is vertically aligned with the electromagnet 603.

[0056] A return spring B606 is provided on the outside of the limiting slide rod 604 between the sliding support plate 602 and the mounting angle plate 601. A positioning protrusion 607 is provided on one end of the suction block 605 of the sliding support plate 602. A positioning toothed plate 608 is provided on the sliding frame 4 corresponding to the positioning protrusion 607. The positioning toothed plate 608 is compatible with the positioning protrusion 607 in terms of specifications.

[0057] Through the above structure, when the electromagnet 603 is energized, it generates magnetic force to attract the adsorption block, thereby causing the sliding support plate 602 and the limiting slide rod 604 to slide upward. This allows the positioning protrusion 607 on the sliding support plate 602 to engage with the positioning toothed plate 608 on the sliding frame 4, thus performing secondary positioning of the rebar bending machine head and preventing small displacements when the rebar bending machine head bends the rebar. Simultaneously, when the electromagnet 603 is de-energized, the return spring causes the sliding support plate 602 and the adsorption block to reset, and the positioning protrusion 607 separates from the positioning toothed plate 608, releasing the secondary positioning state.

[0058] To enhance its secondary positioning performance, four second positioning units 6 are provided, arranged in pairs on the side of the main groove 101.

[0059] See Figure 1 This embodiment also discloses a rebar bending machine head, which includes the above-mentioned bending positioning mechanism.

[0060] See Figure 1 The mounting base plate 5 of the rebar bending machine head is provided with a positioning plate 7 on one side of its upper part. The rebar bending machine head also includes a gearbox 8, a bending swing arm 9, a drive cylinder 10, and a drive hydraulic cylinder 11. The gearbox 8 is located on the mounting base plate 5 opposite to the positioning plate 7. The drive cylinder 10 is located on the side of the gearbox 8. The free end of the drive cylinder 10 passes through the gearbox 8 and is aligned with the positioning through hole of the positioning plate 7. The drive hydraulic cylinder 11 drives and connects to the bending swing arm 9.

[0061] With the above structure, the driving cylinder drives the positioning shaft of the bending hoop swing arm to extend to the positioning plate, and the driving cylinder 1 drives the bending hoop swing arm 9 to run, thereby bending the steel bar.

[0062] To enable the drive cylinder to drive the bending hoop swing arm, the drive cylinder 11 is mounted on the mounting base plate 5 at the bottom of the gearbox 8. A rack sleeve is provided on the free end of the drive cylinder 11, and the rack sleeve is connected to the bending hoop swing arm 9.

[0063] The working principle of the head locking device of the rebar bending machine and the head of the rebar bending machine of this utility model are as follows:

[0064] When using this device, if it is necessary to adjust the position of the rebar bending machine head, stop the oil supply to the locking cylinder. Under the weight of the rebar bending machine head itself, the locking cylinder slowly depressurizes and resets. At the same time, the depressurization applies an upward force to the pressure plate through the reset spring A, thereby driving the pressure plate and buffer sleeve to apply upward pressure to the locking cylinder, thus accelerating the depressurization process of the locking cylinder and speeding up the reset process of the pressure plate.

[0065] After the lock is released, the traveling unit is started. The traveling unit drives the head of the rebar bending machine to move along the sliding frame. After moving to the designated position, the locking cylinder is activated and oil is supplied to the locking cylinder. The free end of the locking cylinder applies pressure to the buffer sleeve, thereby pressing the pressure plate against the sliding frame, thus locking the position of the rebar bending machine head in one go.

[0066] After the first locking is completed, the electromagnet is energized. The electromagnet generates magnetic force to attract the adsorption block, which in turn drives the sliding plate and the limit slide rod to slide upward. This causes the positioning protrusion on the sliding plate to engage with the positioning tooth plate on the sliding frame, thus performing secondary positioning of the rebar bending machine head and preventing small displacements when the rebar bending machine head bends the rebar.

[0067] It should be noted that, in actual implementation, the structure depicted in the accompanying drawings of this specification is not a fixed or unchanging embodiment. The structure and position of the second positioning unit can be changed according to actual needs, including but not limited to snap-fit ​​structures, pressure positioning structures, and gear positioning structures, as long as the positioning of the rebar bending machine head can be achieved. Furthermore, the accompanying drawings and abstract figures in this specification are for illustrative purposes only and do not represent the specific structure or actual quantity in actual implementation.

[0068] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The use of terms such as "a" or "an" in this specification and claims does not necessarily indicate a limitation on quantity. Terms such as "comprising" or "including" mean that the element or component preceding the word encompasses the element or component listed following the word and its equivalents, without excluding other elements or components. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0069] The exemplary embodiments of the present invention have been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of the present invention, and various combinations can be made to the various technical features and structures proposed by the present invention without exceeding the protection scope of the present invention.

Claims

1. A locking device for the head position of a rebar bending machine, installed on the head of a rebar bending machine, the locking device for the head position of the rebar bending machine includes a limiting unit, the head of the rebar bending machine being slidably mounted on a sliding frame via the limiting unit, characterized in that: It also includes a locking and positioning unit, a second positioning unit and a traveling unit. The locking and positioning unit is located below the mounting base plate of the rebar bending machine head at the middle position of the limiting unit. The traveling unit is located on the side of the rebar bending machine head and drives it to travel on the sliding frame. The second positioning unit is distributed on both sides of the limiting unit, thereby strengthening the limiting of the limiting unit; The locking and positioning unit includes a reset unit, which includes a pressure plate, a bolt, and a reset spring A. The pressure plate has limit holes at its four corners. The bolt passes through the limit holes at the bottom of the pressure plate and is threaded to the mounting base plate of the rebar bending machine head. The reset spring A is located in the limit hole outside the bolt.

2. The head locking device for bending machine according to claim 1, characterized in that: The limiting unit includes a main groove and an auxiliary pulley. The main groove is symmetrically arranged on the lower part of the mounting base plate of the steel bar bending machine head on both sides of the pressure plate. The main groove is provided with a limiting groove that matches the specifications of the slide rails on both sides of the sliding frame. An auxiliary pulley is embedded in the limiting groove. The auxiliary pulley is a rolling wheel.

3. The head locking device for a bending machine according to claim 2, characterized in that: When the main groove body slides on the slide rail through the limiting groove and the slide rail, the auxiliary pulley rolls on the slide rail.

4. The head locking device for a bending machine according to claim 2, characterized in that: The walking unit includes a walking gear shaft, a toothed plate, and a motor protective box. The motor protective box is located on the side of the mounting base plate of the rebar bending machine head. A walking motor is installed inside the motor protective box. The rotating shaft of the walking motor passes through the limiting unit and drives the walking gear shaft. The toothed plate is located at the bottom of the sliding frame, and the walking gear shaft meshes with the toothed plate. The specifications of the sliding frame are compatible with the specifications of the main groove.

5. The head locking device for a bending machine according to claim 1, characterized in that: The locking and positioning unit also includes a locking cylinder and a buffer sleeve. The fixed end of the locking cylinder is embedded in the mounting base plate of the rebar bending machine head. The free end of the locking cylinder is connected to the pressure plate through the buffer sleeve. The buffer sleeve is embedded in the middle of the top of the pressure plate. The pressure plate is set below the mounting base plate of the rebar bending machine head through a reset unit. The bolt is a semi-threaded internal hex bolt.

6. The head position locking device of the bending machine according to claim 5, characterized in that: The bottom of the buffer sleeve and the contact part with the pressure plate are made of deformable rubber material, and the bottom surface of the pressure plate is compatible with the top surface of the sliding frame. In addition, a rubber pad is provided on the bottom surface of the pressure plate.

7. The head locking device for a bending machine according to claim 1, characterized in that: The second positioning unit includes a mounting angle plate, a sliding support plate, and an electromagnet. The mounting angle plate is fixedly disposed on the side of the limiting unit. A limiting slide rod is integrally or separately disposed on the upper part of the sliding support plate. The limiting slide rod is slidably connected to the mounting angle plate. The electromagnet is disposed at the bottom of the mounting angle plate opposite to the limiting slide rod. An adsorption block is disposed on the sliding support plate. The adsorption block is vertically aligned with the electromagnet. A return spring B is provided on the outside of the limiting slide rod between the sliding tray and the mounting corner plate. A positioning protrusion is provided on one end of the suction block opposite to the sliding tray. A positioning toothed plate is provided on the sliding frame corresponding to the positioning protrusion. The positioning toothed plate is compatible with the specifications of the positioning protrusion. The second positioning unit consists of four units, arranged in pairs on the side of the limiting unit.

8. A rebar bending machine head, characterized in that: The rebar bending machine head includes the bending machine head position locking device as described in any one of claims 1-7.

9. The rebar bending machine head according to claim 8, characterized in that: A positioning plate is provided on one side of the upper part of the mounting base plate of the rebar bending machine head. The rebar bending machine head also includes a gearbox, a bending swing arm, a drive cylinder, and a drive hydraulic cylinder. The gearbox is located on the mounting base plate opposite the positioning plate. The drive cylinder is located on the side of the gearbox. The free end of the drive cylinder passes through the gearbox and is aligned with the positioning through hole of the positioning plate. The drive hydraulic cylinder drives and connects to the bending swing arm.

10. The rebar bending machine head according to claim 9, characterized in that: The drive cylinder is mounted on the mounting base plate at the bottom of the gearbox, and a rack sleeve is provided on the free end of the drive cylinder. The rack sleeve is connected to the bent hoop swing arm.

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