A fully automatic straightening CNC steel bar bending machine

Abstract

The present invention relates to the technical field of hoop bending machines, and discloses a fully automatic straightening CNC steel bar hoop bending machine, comprising: a frame, on which a pre-straightening component, a steel bar detection component, a traction component, a straightening component, a bending component and a shearing component are fixed; a separate adjustable wheel component, the separate adjustable wheel component is swingably connected to the straightening component, the separate adjustable wheel component comprises a first straightening wheel, an adjustable wheel component and a first driving mechanism, the first straightening wheel is rotatably connected to the straightening component, the adjustable wheel component is opposite to the first straightening wheel, the adjustable wheel component comprises an adjustable wheel plate and two rotatably separate adjustable wheels installed on both sides of the adjustable wheel plate, and the first driving mechanism is used to drive the adjustable wheel plate to swing. The present invention solves the problem that the existing CNC hoop bending machines mostly use the method of manually adjusting the straightening wheel downward pressure to adjust the steel bar straightness, thereby resulting in low efficiency and low precision in adjusting the steel bar straightness.

Description

Technical Field

[0001] The invention relates to the technical field of stirrup bending machines, and in particular to a fully automatic straightening CNC steel bar stirrup bending machine. Background Art

[0002] The hoop bending machine is a processing tool for steel bar operations. Its purpose is to process the steel bar into a specified angle and model. The hoop bending machine is generally divided into semi-automatic hoop bending machine and fully automatic hoop bending machine. Among them, the fully automatic CNC steel bar hoop bending machine can automatically complete the straightening, sizing, bending and cutting of steel bars. It has a very comprehensive processing capability and can process more and more complex shapes.

[0003] At present, the straightening method of the steel bar bending machine on the market is to adjust the straightness of the steel bar by manually adjusting the downward pressure of each straightening wheel. When replacing steel bars of different sizes, or when the diameter of the steel bar itself changes, especially when the straightness of two steel bars is inconsistent, the relative position of the individual adjustable wheels needs to be readjusted. The adjustment range mostly depends on the actual experience of the operator. If the operator is inexperienced, it will cause low efficiency of equipment use and affect product quality. Summary of the invention

[0004] Based on the above technical problems, the present invention provides a fully automatic straightening CNC steel bar bending machine, which solves the problem that the existing CNC hoop bending machines mostly adjust the straightness of the steel bars by manually adjusting the downward pressure of the straightening wheel, resulting in low efficiency and low precision in adjusting the straightness of the steel bars.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] A fully automatic straightening CNC steel bar bending machine comprises: a frame, on which a pre-straightening component, a steel bar detection component, a traction component, a straightening component, a bending component and a shearing component are fixed; a separate adjustable wheel component, which is swingably connected to the straightening component, the separate adjustable wheel component comprises a first straightening wheel, an adjustable wheel component and a first driving mechanism, the first straightening wheel is rotatably connected to the straightening component, the adjustable wheel component is opposite to the first straightening wheel, the adjustable wheel component comprises an adjustable wheel plate and two rotatably separate adjustable wheels installed on both sides of the adjustable wheel plate, and the first driving mechanism is used to drive the adjustable wheel plate to swing.

[0007] As a preferred embodiment, the first driving mechanism includes: a first rotating shaft, one end of which is fixedly connected to the adjustable wheel plate, and the other end of which passes through the fixed straightening wheel plate and is fixedly connected to the rotating arm; a fine-tuning transmission joint, which is hingedly connected to the strip hole of the rotating arm through a pin shaft; a fine-tuning transmission shaft, one end of which is threadedly connected to the fine-tuning transmission joint, and the other end of which is connected to the first driving motor fixed on the fixed straightening wheel plate and can be driven to rotate by the first driving motor.

[0008] As a preferred embodiment, the straightening assembly includes: a bracket, the bracket includes a fixed straightening wheel plate and a movable straightening wheel plate; a second straightening wheel, a plurality of second straightening wheels are rotatably connected to the fixed straightening wheel plate and the movable straightening wheel plate, and the second straightening wheels on the fixed straightening wheel plate and the movable straightening wheel plate are staggered; a lifting mechanism, the lifting mechanism is symmetrically arranged on the fixed straightening wheel plate, and the lifting end of the lifting mechanism is connected to the movable straightening wheel plate.

[0009] As a preferred embodiment, the lifting mechanism includes: the lifting mechanism includes a second drive motor and a transmission shaft, the second drive motor and the transmission shaft are connected, the second drive motor is fixed on the fixed straightening wheel plate, and the transmission shaft and the movable straightening wheel plate are threadedly connected.

[0010] As a preferred embodiment, it also includes an auxiliary feeding assembly, which includes: a first reducer; a third drive motor, which is connected to the input end of the first reducer; a first traction wheel, which is connected to the output end of the first reducer; a first cylinder, which is hinged on the frame; a clamping assembly, which includes a first clamping wheel, a first connecting rod, a first clamping arm, a second rotating shaft and a first fixed seat, the first fixed seat is fixed on the frame, the second rotating shaft is hinged on the first fixed seat, the first connecting rod is fixed on the second rotating shaft, the first clamping wheel is fixed on the first connecting rod, one end of the first clamping arm is hinged to the telescopic end of the first cylinder, the other end of the first clamping arm is fixedly connected to the second rotating shaft, and the first clamping wheel is opposite to the traction wheel.

[0011] As a preferred embodiment, the steel bar detection assembly includes: a clamp-shaped bracket, which is hingedly formed by two cross-arranged second connecting rods; a first elastic member, the upper and lower ends of the first elastic member are respectively fixedly connected to the tail ends of the two second connecting rods; a linear displacement sensor, the upper and lower ends of the linear displacement sensor are respectively hingedly connected to the tail ends of the two second connecting rods; a measuring wheel assembly, the measuring wheel assembly is installed at the front end of the second connecting rod, and allows the steel bar to be measured to pass between the two measuring wheel assemblies.

[0012] As a preferred embodiment, the measuring wheel assembly includes: a mounting seat, which is fixedly connected to the front end of the second connecting rod; a rotary encoder, which is fixedly mounted on the mounting seat; a measuring wheel axle, one end of which is fixedly connected to the rotating shaft of the rotary encoder, and a movable measuring wheel and a fixed measuring wheel are provided on the measuring wheel axle.

[0013] As a preferred manner, the measuring wheel axle is fixedly connected to the rotating shaft of the rotary encoder via a coupling.

[0014] As a preferred embodiment, the traction assembly includes: two second traction wheels, the second traction wheels are hinged on the frame, and an annular chain is provided between the rotating shafts of the two second traction wheels; a fourth driving mechanism, the driving shaft of the fourth driving mechanism drives one of the second traction wheels to rotate; a moving block assembly, the moving block assembly includes a moving block and a second elastic member, the second elastic member is fixed in a groove of the frame, the moving block is fixed to the second elastic member and moves in the groove; two second clamping wheels, the second clamping wheel is hinged on the moving block, and the second clamping wheel is opposite to the traction wheel; a clamping mechanism, the clamping mechanism pushes the moving block to move in the groove.

[0015] As a preferred embodiment, the clamping mechanism includes: a bidirectional cylinder; a second clamping arm, the second clamping arm includes a driving arm and a driven arm, one end of the driving arm is hinged to the telescopic end of the bidirectional cylinder, the other end of the driving arm is hinged to the driven arm, and the other end of the second clamping arm is hinged to the frame, and the second clamping arm can squeeze the moving block in the groove when rotating on the frame.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention comprises a fully automatic straightening CNC steel bar bending machine through a pre-straightening assembly, a steel bar detection assembly, a traction assembly, a straightening assembly, a bending assembly, a shearing assembly and a separate adjustable wheel assembly on a frame, so as to achieve straightening, bending and shearing of coiled steel bars. The first straightening wheel on the separate adjustable wheel assembly and the adjustable wheel assembly constitute a straightening wheel group, so that the adjustable wheel assembly, driven by the first driving mechanism, can automatically adjust the straightness of the steel bars when straightening the steel bars according to the actual production conditions. The straightening accuracy and adjustment efficiency of the steel bars when straightening the steel bars are improved, and the product quality is improved.

[0018] (2) The present invention can collect the size, type, length, and number of steel bars entering the CNC hoop bending machine through the cooperation of the clamp bracket, the first elastic member, the first linear displacement sensor, and the measuring wheel assembly, so as to facilitate the CNC hoop bending machine to adjust its own operating parameters according to the above parameters, thereby ensuring the quality of the final product. Compared with manual operation, the steel bar monitoring mechanism of the present invention collects more accurate information parameters and is more efficient.

[0019] (3) The present invention uses a lifting mechanism to control the movement of the movable straightening wheel plate relative to the fixed straightening wheel plate, and can mechanically adjust the downward pressure of the second straightening wheel on the movable straightening wheel plate, which is beneficial to automatically complete the adjustment of the straightness of the steel bars during straightening according to actual production conditions, thereby improving the adjustment efficiency during straightening of the steel bars.

[0020] (4) The present invention loosens the steel bar coil by using an auxiliary feeding assembly, which is beneficial for the traction assembly to traction the steel bar.

[0021] (5) The present invention uses a bidirectional cylinder to drive the clamping arm to squeeze the moving block in the frame groove, so that the second clamping wheel fixed on the moving block moves in the groove, and the second traction wheel is opposite to the second clamping wheel, so that the second traction wheel and the second clamping wheel can immediately clamp the steel bar. When the fourth driving mechanism drives the second traction wheel, the steel bar can be driven forward or backward. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present application will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings, in which:

[0023] Figure 1 It is a schematic diagram of the front structure of a fully automatic straightening CNC steel bar bending machine shown in some embodiments of the present application.

[0024] Figure 2 It is a schematic diagram of the top view of the structure of the fully automatic straightening CNC steel bar hoop bending machine shown in some embodiments of the present application.

[0025] Figure 3 It is a schematic structural diagram of a separate adjustable wheel assembly according to some embodiments of the present application.

[0026] Figure 4 It is a schematic isometric view of a first driving mechanism in a separate adjustable wheel assembly according to some embodiments of the present application.

[0027] Figure 5 It is a schematic side cross-sectional structural diagram of a separate adjustable wheel assembly according to some embodiments of the present application.

[0028] Figure 6 It is a schematic diagram of the bending direction of the steel bar when the adjustable wheel assembly in the separate adjustable wheel assembly according to some embodiments of the present application swings counterclockwise.

[0029] Figure 7 It is a schematic diagram of the bending direction of the steel bar when the adjustable wheel assembly in the separate adjustable wheel assembly shown in some embodiments of the present application swings clockwise.

[0030] Figure 8 It is a schematic diagram of the structure of a straightening assembly according to some embodiments of the present application.

[0031] Fig. 9 It is a schematic diagram of the structure of the auxiliary feeding assembly according to some embodiments of the present application.

[0032] Fig.10 It is a schematic diagram of the structure of a steel bar detection assembly according to some embodiments of the present application.

[0033] Fig.11 It is a schematic diagram of the structure of a measuring wheel assembly in a steel bar detection assembly according to some embodiments of the present application.

[0034] Fig.12 It is a side sectional view of a steel bar detection assembly according to some embodiments of the present application.

[0035] Fig.13 It is a schematic diagram of the front structure of a traction assembly according to some embodiments of the present application.

[0036] Fig.14 It is a schematic diagram of the structure of a moving block assembly according to some embodiments of the present application.

[0037] Fig.15 Schematic diagram of the structure of the fourth driving mechanism according to some embodiments of the present application.

[0038] Fig.16 It is a schematic diagram of the structure of two second traction wheel transmission according to some embodiments of the present application.

[0039] Fig.17 It is a schematic diagram of the front structure of a bending assembly according to some embodiments of the present application.

[0040] Fig.18 It is a schematic diagram of the top view of the bending assembly according to some embodiments of the present application.

[0041] Fig.19 It is a schematic diagram of the front structure of the shearing assembly according to some embodiments of the present application.

[0042] Fig. 20 It is a schematic diagram of the top view of the shearing assembly according to some embodiments of the present application.

[0043] Among them, 1 frame, 2 auxiliary feeding assembly, 210 third driving motor, 220 first reducer, 230 first traction wheel, 240 first clamping wheel, 250 first fixed seat, 260 second rotating shaft, 270 first connecting rod, 280 first clamping arm, 290 first cylinder, 3 steel bar detection assembly, 3010 measuring wheel assembly, 3011 rotary encoder, 3012 rotating shaft, 3013 coupling, 3014 mounting seat, 3015 measuring wheel shaft, 3016 movable measuring wheel, 3017 fixed measuring wheel, 3020 hinge shaft, 3030 clamp bracket, 3040 first linear displacement sensor, 3050 first elastic member, 3060 straightening wheel plate, 4 pre-straightening assembly, 5 traction assembly, 510 second traction wheel, 520 second clamping wheel, 530 bidirectional cylinder, 540 second clamping arm, 541 driving arm, 542 driven arm, 550 moving block assembly, 551 moving block, 552 second elastic member, 560 ring chain, 570 fourth driving mechanism, 571 fourth driving motor, 572 first driving pulley, 573 first synchronous belt, 574 first driven pulley, 575 traction spindle, 6 straightening assembly, 610 bracket, 611 fixed straightening wheel plate, 612 movable straightening wheel plate, 620 second straightening wheel, 630 third linear displacement sensor, 640 transmission shaft, 650 torque sensor, 660 second driving motor, 7 separately adjustable wheel assembly, 7001 first straightening wheel, 7002 first driving motor, 7003 adjustable wheel plate, 7004 separately adjustable wheel, 7005 sensor mounting shaft, 7006 second linear displacement sensor, 7007 rotating arm, 7008 fine-tuning transmission joint, 7010 motor mounting plate, 7011 the first rotating shaft, 7012 the sleeve, 7013 the pin, 8 the shearing assembly, 810 the sixth driving motor, 820 the second reducer, 830 the rotating arm, 840 the eccentric shaft, 850 the connecting rod, 860 the shearing rocker arm, 870 the movable blade, 880 the second fixed seat, 881 the steel bar output channel, 890 the fixed blade, 9 the bending assembly, 910 the fifth driving motor, 920 the second driving pulley, 930 the second synchronous belt, 940 the second driven pulley, 950 the bending fixed shaft, 960 the bending rotating shaft, 970 the bending wheel, 980 the bending mold, 10 the steel bars. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0045] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] Figures 1 to 20 This is a schematic diagram of the structure of the fully automatic straightening CNC steel bar bending machine shown in some embodiments of the present application. Figures 1 to 20 The fully automatic straightening CNC steel bar 10 bending machine involved in this application is introduced. It should be noted that: Figures 1 to 20 This is only an example and does not limit the specific shape and structure of the fully automatic straightening CNC steel bar 10 bending machine.

[0047] See also Figures 1 to 3 In the present embodiment, a fully automatic straightening CNC steel bar bending machine comprises: a frame 1, on which a pre-straightening component 4, a steel bar detection component 3, a traction component 5, a straightening component 6, a bending component 9 and a shearing component 8 are fixed; a separate adjustable wheel component 7, the separate adjustable wheel component 7 is swingably connected to the straightening component 6, the separate adjustable wheel component 7 comprises a first straightening wheel 7001, an adjustable wheel component and a first driving mechanism, the first straightening wheel 7001 is rotatably connected to the straightening component 6, the adjustable wheel component is opposite to the first straightening wheel 7001, the adjustable wheel component comprises an adjustable wheel plate 7003 and two rotatably separate adjustable wheels 7004 installed on both sides of the adjustable wheel plate 7003, and the first driving mechanism is used to drive the adjustable wheel plate 7003 to swing.

[0048] In this embodiment, the pre-straightening component 4 and the straightening component 6 have different straightening directions for the steel bar 10. The pre-straightening component 4 is used to first limit a relative direction of the steel bar 10. The steel bar detection component 3 is used to collect parameters related to the size, type, length, and number of the steel bar 10, so as to facilitate the CNC hoop bending machine to adjust its own operating parameters according to the above parameters. The traction component 5 is used to pull the steel bar 10. The pre-straightening component 4 is between the steel bar detection component 3 and the traction component 5, and can achieve straightening of the steel bar 10 in one direction. The traction component 5 is followed by the straightening component 6, which can achieve straightening of the steel bar 10 in another direction, thereby straightening the steel bar 10. Because the straightening component 6 is swingably connected to a separate adjustable wheel component 7, the first straightening wheel 7001 of the separate adjustable wheel component 7 and the adjustable wheel component constitute an adjustable straightening wheel group. When the steel bar 10 passes through the straightening wheel assembly constituted by the first straightening wheel 7001 and the adjustable wheel assembly, the steel bar 10 can be straightened under the action of the straightening wheel group. At the same time, the first driving mechanism can adjust the swing angle of the adjustable wheel plate 7003 according to the actual production conditions, so as to adjust the distance between the separate adjustable wheels 7004 on both sides of the adjustable wheel plate 7003 and the first straightening wheel 7001, and complete the adjustment of the straightness of the steel bar 10 when the steel bar 10 is straightened. After the steel bar 10 is straightened, it passes through the shearing component 8 and the bending component 9 in sequence. The bending component 9 is started first to bend the straightened steel bar 10, and then the shearing component 8 is started to separate the bent steel bar 10 from the straightened steel bar 10. The present invention forms a fully automatic straightening CNC steel bar 10 bending machine through the pre-straightening component 4, steel bar detection component 3, traction component 5, straightening component 6, bending component 9, shearing component 8 and a separate adjustable wheel component 7 on the frame 1, which can achieve straightening, bending and shearing of the coiled steel bar 10. The first straightening wheel 7001 on the separate adjustable wheel component 7 and the adjustable wheel component form a straightening wheel group, so that the adjustable wheel component can automatically complete the adjustment of the straightness of the steel bar 10 when the steel bar 10 is straightened according to the actual production conditions under the drive of the first driving mechanism. The straightening accuracy and adjustment efficiency of the steel bar 10 when straightening are improved, and the product quality is improved.

[0049] See also Figure 6 When the adjustable wheel plate 7003 swings counterclockwise, the steel bar 10 can be bent upward. Figure 7 Correspondingly, when the adjustable wheel plate 7003 swings clockwise, the steel bar 10 can be bent downward. In this way, the straightness of the steel bar 10 can be automatically adjusted according to the actual production conditions. This improves the straightening accuracy of the steel bar 10 and improves the product quality.

[0050] The pre-straightening component 4 and the straightening component 6 here have the same structure. Because the pre-straightening component 4 and the straightening component 6 straighten the two relative directions of the steel bar 10, the pre-straightening component 4 and the straightening component 6 are installed at different positions on the frame 1. The pre-straightening component 4 of this embodiment limits the straightness of the steel bar 10 horizontally, and the straightening component 6 limits the straightness of the steel bar 10 vertically, thereby achieving straightening of the steel bar 10.

[0051] See also Figures 4-5 In some embodiments, the first driving mechanism includes: a first rotating shaft 7011, one end of the first rotating shaft 7011 is fixedly connected to the adjustable wheel plate 7003, and the other end thereof passes through the fixed straightening wheel plate 611 and is fixedly connected to the rotating arm 7007; a fine-tuning transmission joint 7008, the fine-tuning transmission joint 7008 is hingedly connected to the strip hole of the rotating arm 7007 through a pin shaft 7013; a fine-tuning transmission shaft 7009, one end of the fine-tuning transmission shaft 7009 is threadedly connected to the fine-tuning transmission joint 7008, and the other end thereof is connected to the first driving motor 7002 fixed on the fixed straightening wheel plate 611 and can be driven to rotate by the first driving motor 7002.

[0052] In this embodiment, the driving principle of the first driving mechanism is that the first driving motor 7002 drives the fine-tuning transmission shaft 7009 to rotate, and because the fine-tuning transmission shaft 7009 is threadedly connected to the fine-tuning transmission joint 7008, and because the fine-tuning transmission joint 7008 is hingedly connected to the rotating arm 7007. When the fine-tuning transmission shaft 7009 rotates, since the fine-tuning transmission joint 7008 is not rotatable, the fine-tuning transmission joint 7008 threadedly connected to the fine-tuning transmission shaft 7009 will move along the horizontal direction of the fine-tuning transmission shaft 7009 under the action of the thread, thereby driving the rotating arm 7007 to rotate, and finally the rotating arm 7007 drives the adjustable wheel plate 7003 to swing through the first rotating shaft 7011, thereby achieving the purpose of automatically adjusting the straightness of the steel bar 10. Among them, the forward and reverse directions of the first driving motor 7002 will determine the swing direction of the adjustable wheel plate 7003. In order to ensure that the fine-tuning transmission joint 7008 can always remain horizontal with the fine-tuning transmission shaft 7009, the connecting hole at the hinge between the rotating arm 7007 and the fine-tuning transmission joint 7008 is a strip hole. The strip hole can adjust the position of the fine-tuning transmission joint 7008 so that it remains horizontal with the fine-tuning transmission shaft 7009 when the rotating arm 7007 swings.

[0053] In addition, in order to be applicable to the CNC hoop bending machine with double-row straightening mechanism, two sets of side-by-side adjustable wheel assemblies can be provided and the first rotating shaft 7011 of the first driving mechanism of one of the adjustable wheel assemblies close to the fixed straightening wheel plate 611 is made into a sleeve 7012, which is sleeved on the first rotating shaft 7011 of the first driving mechanism of the other set of adjustable wheel assemblies. The length of the sleeve 7012 after extending out of the fixed straightening wheel plate 611 is smaller than the first rotating shaft 7011, and the two are fixedly mounted with the rotating arm 7007, so that the straightening degree of the two steel bars 10 can be adjusted by driving the two side-by-side adjustable wheel assemblies through the two sets of first driving mechanisms without interfering with each other.

[0054] See also Figure 4 In some embodiments, the first driving motor 7002 is fixed to the straightening wheel plate 3060 through the motor mounting plate 7010 , so as to conveniently and firmly mount the first driving motor 7002 on the straightening wheel plate 3060 .

[0055] See also Figure 4 In some embodiments, a second linear displacement sensor 7006 is further provided on the straightening wheel plate 3060 , one end of the second linear displacement sensor 7006 is hingedly connected to the sensor mounting shaft 7005 , and the other end thereof is hingedly connected to the rotating arm 7007 .

[0056] The second linear displacement sensor 7006 can collect the rotation information of the rotating arm 7007 and feed back to the control system of the driving mechanism, so as to accurately determine whether the rotating arm 7007 is rotated in place. Specifically, the second linear displacement sensor 7006 can adopt KPC, KPM fisheye articulated displacement sensors, and fisheye joints are provided at both ends of such second linear displacement sensor 7006, which can facilitate the connection and installation between the second linear displacement sensor 7006 and the sensor installation shaft 7005 and the rotating arm 7007.

[0057] See also Figure 8 In some embodiments, the straightening assembly 6 includes: a bracket 610, the bracket 610 includes a fixed straightening wheel plate 611 and a movable straightening wheel plate 612; a second straightening wheel 620, a plurality of second straightening wheels 620 are rotatably connected to the fixed straightening wheel plate 611 and the movable straightening wheel plate 612, and the second straightening wheels 620 on the fixed straightening wheel plate 611 and the movable straightening wheel plate 612 are staggered; a lifting mechanism, the lifting mechanism is symmetrically arranged on the fixed straightening wheel plate 611, and the lifting end of the lifting mechanism is connected to the movable straightening wheel plate 612.

[0058] In this embodiment, the steel bar 10 passes through between the fixed straightening wheel plate 611 and the second straightening wheel 620 on the movable straightening wheel plate 612, and the lifting mechanism is started. The lifting end of the lifting mechanism drives the movable straightening wheel plate 612 to move relative to the fixed straightening wheel plate 611, so that the downward pressure of the movable straightening wheel plate 612 can be controlled by the lifting mechanism. The second straightening wheels 620 of the fixed straightening wheel plate 611 and the movable straightening wheel plate 612 are staggered, which is beneficial to the transmission of the steel bar 10 between the fixed straightening wheel plate 611 and the second straightening wheel 620 of the movable straightening wheel plate 612.

[0059] See also Figure 8 In some embodiments, the lifting mechanism includes: the lifting mechanism includes a second drive motor 660 and a transmission shaft 640, the second drive motor 660 and the transmission shaft 640 are connected, the second drive motor 660 is fixed on the fixed straightening wheel plate 611, and the transmission shaft 640 and the movable straightening wheel plate 612 are threadedly connected.

[0060] In this embodiment, the second drive motor 660 is started. The second drive motor 660 is a servo motor. The second drive motor 660 rotates to drive the transmission shaft 640 to rotate. The transmission shaft 640 is a lead screw. Since the transmission shaft 640 and the movable straightening wheel plate 612 are threadedly connected, the second drive motor 660 can rotate to drive the movable straightening wheel plate 612 to move up and down.

[0061] In some embodiments, the lifting mechanism may also be a cylinder, the telescopic end of the cylinder is connected to the movable straightening wheel plate 612, and the cylinder is started to realize the movement of the movable straightening wheel plate 612 relative to the fixed straightening wheel plate 611.

[0062] See also Figure 8 In some embodiments, a torque sensor 650 is provided on the second driving motor 660 .

[0063] In this embodiment, it is used to measure the torque of the second driving motor 660 in real time.

[0064] See also Figure 8 In some embodiments, a third linear displacement sensor 630 is provided between the fixed straightening wheel plate 611 and the movable straightening wheel plate 612 .

[0065] In this embodiment, the third linear displacement sensor 630 is used to detect the relative position of the fixed straightening wheel plate 611 and the movable straightening wheel plate 612 to prevent damage to the equipment due to over-travel.

[0066] See also Fig. 9In some embodiments, an auxiliary feeding assembly 2 is further included, and the auxiliary feeding assembly 2 includes: a first reducer 220; a third drive motor 210, the third drive motor 210 is connected to the input end of the first reducer 220; a first traction wheel 230, the first traction wheel 230 is connected to the output end of the first reducer 220; a first cylinder 290, the first cylinder 290 is hinged on the frame 1; a clamping assembly, the clamping assembly includes a first clamping wheel 240, a first connecting rod 270, and a first clamping arm 2 80, a second rotating shaft 260 and a first fixed seat 250, the first fixed seat 250 is fixed on the frame 1, the second rotating shaft 260 is hinged on the first fixed seat 250, the first connecting rod 270 is fixed on the second rotating shaft 260, the first clamping wheel 240 is fixed on the first connecting rod 270, one end of the first clamping arm 280 is hinged to the telescopic end of the first cylinder 290, the other end of the first clamping arm 280 is fixedly connected to the second rotating shaft 260, and the first clamping wheel 240 is opposite to the traction wheel.

[0067] In this embodiment, the third drive motor 210 is started, the third drive motor 210 is connected to the first reducer 220, the third drive motor 210 rotates through the first reducer 220 to drive the first traction wheel 230 to rotate, and the first cylinder 290 is started at the same time, the telescopic end of the first cylinder 290 is extended and retracted, and the second rotating shaft 260 connected to the first clamping arm 280 is pushed to rotate on the first fixed seat 250, and the second rotating shaft 260 rotates to drive the first connecting rod 270 connected to the first clamping wheel 240 to rotate, so that the first clamping wheel 240 moves relative to the first traction wheel 230, and the steel bar 10 is rolled on the output shaft, so that the first clamping wheel 240 presses the steel bar 10 through the first cylinder 290, and the third drive motor 210 provides power, and drives the first traction wheel 230 to rotate through the first reducer 220, thereby driving the steel bar 10 forward. The auxiliary feeding mechanism stops working, and when the equipment needs to withdraw the steel bar 10, the corresponding first traction wheel 230 drives the steel bar 10 to retreat until the steel bar 10 exits the equipment.

[0068] See also Fig.10 In some embodiments, the steel bar detection component 3 includes: a clamp bracket 3030, which is hinged by two cross-arranged second connecting rods; a first elastic member 3050, wherein the upper and lower ends of the first elastic member 3050 are respectively fixedly connected to the tail ends of the two second connecting rods; a first linear displacement sensor 3040, wherein the upper and lower ends of the first linear displacement sensor 3040 are respectively hingedly connected to the tail ends of the two second connecting rods; and a measuring wheel assembly 3010, which is installed at the front end of the second connecting rod and allows the steel bar 10 to be measured to pass between the two measuring wheel assemblies 3010.

[0069] In this embodiment, when the measuring steel bar 10 passes between the two measuring wheel assemblies 3010, since the measuring wheel assemblies 3010 and the first linear displacement sensor 3040 are located at the jaws on both sides of the clamp bracket 3030, the diameter change of the steel bar 10 will make the two measuring wheel assemblies 3010 close together or increase the distance between them, and cause the clamp bracket 3030 to deform accordingly, thereby causing the first linear displacement sensor 3040 to have a corresponding displacement change. By collecting data from the first linear displacement sensor 3040, the diameter of the measuring steel bar 10 can be analyzed and calculated.

[0070] In addition, for the steel bars 10 processed by the CNC hoop bending machine, the types are mainly divided into two categories: round steel bars 10 and spiral steel bars 10. The difference between round steel bars 10 and spiral steel bars 10 is that the spiral steel bars 10 have ribs on their surfaces. Due to the presence of the ribs of the spiral steel bars 10, the data of the first linear displacement sensor 3040 will change regularly when it passes through the measuring wheel assembly 3010, so the type of the steel bar 10 can be determined by the frequency of change of the linear displacement data.

[0071] The first elastic member 3050 is used to enable the clamp-shaped bracket 3030 to reset after deformation and to enable the measuring wheel assembly 3010 to maintain contact with the steel bar 10 to be measured, thereby ensuring the accuracy of the measurement. Specifically, the first elastic member 3050 is a spring.

[0072] Specifically, the first linear displacement sensor 3040 may adopt a KPC or KPM fisheye articulated displacement sensor. Such first linear displacement sensor 3040 is provided with fisheye joints at both ends to facilitate the connection and installation between the first linear displacement sensor 3040 and the second connecting rod.

[0073] See also Figures 11-12 In some embodiments, the measuring wheel assembly 3010 includes: a mounting seat 3014, which is fixedly connected to the front end of the second connecting rod; a rotary encoder 3011, which is fixedly mounted on the mounting seat 3014; a measuring wheel axle 3015, one end of which is fixedly connected to the rotating shaft 3012 of the rotary encoder 3011, and a movable measuring wheel 3016 and a fixed measuring wheel 3017 are provided on the measuring wheel axle 3015.

[0074] In this embodiment, when the measuring wheel assembly 3010 is actually used, the movable measuring wheels 3016 and the fixed measuring wheels 3017 of the two measuring wheel assemblies 3010 should be arranged crosswise to form a distribution structure in which the movable measuring wheels 3016 of one measuring wheel assembly 3010 correspond to the fixed measuring wheels 3017 of the other measuring wheel assembly 3010, so that two groups of measuring wheel structures for detecting the length and number of steel bars 10 can be formed side by side.

[0075] When the steel bar 10 to be measured passes through a set of measuring wheel structures, the fixed measuring wheel 3017 of this set of measuring wheel structures will drive the corresponding measuring wheel to rotate. Since the measuring wheel shaft 3015 is fixedly connected to the rotating shaft 3012 of the rotary encoder 3011, the rotation of the measuring wheel shaft 3015 will drive the rotating shaft 3012 of the rotary encoder 3011 to rotate. At this time, the rotation of the rotary encoder 3011 represents that a steel bar 10 has passed through this set of measuring wheel structures, so that the number of steel bars 10 can be determined to be 0, 1 or 2, so as to determine the operating status of the subsequent components of the CNC hoop bending machine according to the number of steel bars 10, and the feeding status of the hoop bending machine can also be judged according to the number of steel bars, so that the operator can replenish the steel bars 10 in time.

[0076] In addition, since the circumference of the fixed measuring wheel 3017 is known, one rotation of the fixed measuring wheel 3017 can represent the passage of a steel bar 10 having the circumference of the fixed measuring wheel 3017, and when the fixed measuring wheel 3017 rotates one circle, the rotary encoder 3011 also rotates one circle synchronously. Combined with the rotation number data of the rotary encoder 3011, the length of the steel bar 10 that has passed through the measuring wheel assembly 3010 can be obtained.

[0077] See also Figures 11-12 In some embodiments, the movable measuring wheel 3016 is movably connected to the measuring wheel shaft 3015 via a bearing, and the fixed measuring wheel 3017 is fixedly connected to the measuring wheel shaft 3015 via a key.

[0078] In this embodiment, the measuring wheel axle 3015 is fixedly connected to the rotating shaft 3012 of the rotary encoder 3011 via a coupling 3013 .

[0079] On some hoop bending machines that do not require double-row detection, the measurement requirement can be met by simplifying the measuring wheel assembly 3010. The specific structure is that the measuring wheel assembly 3010 without the movable measuring wheel 3016 is installed on one second connecting rod, and a rotatable measuring wheel is installed on another second connecting rod. In this way, the monitoring of a single steel bar 10 can be achieved.

[0080] See also Figures 11-12 In some embodiments, the mounting seat 3014 is cylindrical, and the measuring wheel shaft 3015 is installed in the mounting seat 3014 through a bearing.

[0081] In this embodiment, the measuring wheel axle 3015 is installed in the mounting seat 3014 through a bearing. The mounting seat 3014 supports the measuring wheel axle 3015, so that the structure of the movable measuring wheel 3016 and the fixed measuring wheel 3017 installed on the measuring wheel axle 3015 is more solid, and the rotation of the measuring wheel axle 3015 is also more stable.

[0082] See also Fig.10In some embodiments, the clamp bracket 3030 is mounted on the straightening wheel plate 3060 at its hinge via the hinge shaft 3020 .

[0083] In this embodiment, the installation structure of the clamp-shaped bracket 3030 is simple and reliable, and the steel bar 10 monitoring mechanism can be installed as an expansion mechanism on the existing CNC hoop bending machine to transform it.

[0084] See also Figures 13-16 In some embodiments, the traction assembly 5 includes: two second traction wheels 510, the second traction wheels 510 are hinged on the frame 1, and a ring chain 560 is provided between the rotating shafts of the two second traction wheels 510; a fourth driving mechanism 570, the fourth driving mechanism 570 drives one of the second traction wheels 510 to rotate; a moving block assembly 550, the moving block assembly 550 includes a moving block 551 and a second elastic member 552, the second elastic member 552 is fixed in the groove of the frame 1, the moving block 551 is fixed to the second elastic member 552 and moves in the groove; two second clamping wheels 520, the second clamping wheel 520 is hinged on the moving block 551, and the second clamping wheel 520 is opposite to the second traction wheel 510; a clamping mechanism, the clamping mechanism pushes the moving block 551 to move in the groove.

[0085] In this embodiment, the fourth drive mechanism 570 includes a fourth drive motor 571, a first driving pulley 572, a first synchronous belt 573, a first driven pulley 574 and a traction main shaft 575. The fourth drive motor 571 is fixed on the frame 1, the rotating shaft of the fourth drive motor 571 is connected to the first driving pulley 572, the first driven pulley 574 is hinged on the frame 1, the first synchronous belt 573 is connected between the first driving pulley 572 and the first driven pulley 574, and the traction main shaft 575 is connected between the first driven pulley 574 and the second traction wheel 510.

[0086] In this embodiment, the fourth driving mechanism 570 is started, and the fourth driving mechanism 570 drives one of the second traction wheels 510 to rotate. Since an annular chain 560 is provided between the two second traction wheels 510, the other second traction wheel 510 also rotates. At the same time, the clamping mechanism is started. Since the moving block 551 is connected to the second elastic member 552 in the groove of the frame 1, the clamping mechanism pushes the moving block 551 to realize the movement of the second clamping wheel 520 toward the second traction wheel 510, so that the steel bar 10 between the second clamping wheel 520 and the second traction wheel 510 is subjected to traction force, thereby driving the steel bar 10 forward or backward. Since the steel bar 10 has various specifications, the traction assembly 5 can pull the steel bars 10 of various specifications by the second elastic member 552 and adjusting the pressure of the clamping mechanism on the moving block 551.

[0087] See also Figures 13-14In some embodiments, the clamping mechanism includes: a two-way cylinder 530; a second clamping arm 540, the second clamping arm 540 includes a driving arm 541 and a driven arm 542, one end of the driving arm 541 is hinged to the telescopic end of the two-way cylinder 530, the other end of the driving arm 541 is hinged to the driven arm 542, and the other end of the second clamping arm 540 is hinged to the frame 1. When the second clamping arm 540 rotates on the frame 1, it can squeeze the moving block 551 in the groove.

[0088] In this embodiment, the two-way cylinder 530 is started, and because one end of the driving arm 541 is hinged to the telescopic end of the two-way cylinder 530, the other end of the driving arm 541 is hinged to the driven arm 542, and the other end of the second clamping arm 540 is hinged to the frame 1, when the telescopic end of the two-way cylinder 530 drives the driven arm 542 to rotate around the hinged end of the frame 1, the driven arm 542 squeezes the moving block 551 in the groove, thereby realizing the movement of the second clamping wheel 520 toward the second traction wheel 510.

[0089] In this embodiment, the clamping mechanism can also be two one-way acting cylinders, which are fixed on the frame 1, and the telescopic ends of the one-way acting cylinders are connected to the moving block 551, so as to realize the movement of the moving block 551 in the groove.

[0090] See also Figures 17-18 In some embodiments, the bending assembly 9 includes: a fifth drive motor 910, a second active pulley 920, a second synchronous belt 930, a second driven pulley 940, a bending fixed shaft 950, a bending rotating shaft 960, a bending wheel 970 and a bending mold 980; the fifth drive motor 910 is fixed on the frame 1, the rotating shaft of the fifth drive motor 910 is connected to the second active pulley 920, the second driven pulley 940 is hinged on the frame 1, a second synchronous belt 930 is connected between the second active pulley 920 and the second driven pulley 940, the bending rotating shaft 960 is connected to the second driven pulley 940, the bending fixed shaft 950 is fixed on the frame 1 and is concentric with the bending rotating shaft 960, the bending wheel 970 is connected to the bending rotating shaft 960, and the bending mold 980 is connected to the bending fixed shaft 950.

[0091] In this embodiment, the fifth drive motor 910 is started, and the fifth drive motor 910 drives the second active pulley 920 to rotate. The second active pulley 920 drives the second driven pulley 940 to rotate through the second synchronous belt 930. The rotation of the second driven pulley 940 drives the bending rotating shaft 960 to rotate. The rotation of the bending rotating shaft 960 drives the bending wheel 970 to rotate. The bending fixed shaft 950 is fixed on the frame 1 and is concentric with the bending rotating shaft 960. The bending mold 980 is connected to the bending fixed shaft 950. When the steel bar 10 passes through the steel bar 10 channel of the bending module, the bending wheel 970 rotates, thereby realizing the bending of the steel bar 10.

[0092] See also Figures 19-20 In some embodiments, the shearing assembly 8 includes: a sixth drive motor 810, a second reducer 820, a rotating arm 830, an eccentric shaft 840, a connecting rod 850, a shearing rocker arm 860, a movable blade 870, a second fixed seat 880 and a fixed blade 890, the rotating shaft of the sixth drive motor 810 is connected to the input end of the second reducer 820, the rotating arm 830 is connected to the output end of the second reducer 820, the eccentric shaft 840 is connected to the rotating arm 830 and the eccentric shaft 840 is not concentric with the output end of the second reducer 820, the connecting rod 850 is connected to the eccentric shaft 840, the shearing rocker arm 860 is connected to the connecting rod 850, the movable blade arm is connected to the movable blade 870, the second fixed seat 880 is connected to the frame 1, and a fixed blade head is provided at the mouth of the steel bar output channel 881 of the second fixed seat 880, and the movable blade 870 is docked with the fixed blade head when rotating.

[0093] In this embodiment, the sixth drive motor 810 is started, and the rotation shaft of the sixth drive motor 810 drives the rotating arm 830 to rotate, and the rotation of the rotating arm 830 drives the eccentric shaft 840 to rotate, and the rotation of the rotating arm 830 drives the shear rocker arm 860 connected to the connecting rod 850 to rotate, and the rotation of the shear rocker arm 860 drives the movable cutter disc to rotate, and the steel bar 10 passes through the steel bar output channel 881 of the fixed seat, and the movable blade 870 rotates and the fixed blade 890 acts to cut the steel bar 10, thereby achieving shearing of the steel bar 10.

[0094] In some embodiments, the first straightening wheel 7001, the second straightening wheel 620, the movable measuring wheel 3016, the fixed measuring wheel 3017, the second traction wheel 510 and the second clamping wheel 520 are provided with annular grooves, which are helpful in preventing the steel bar 10 from escaping from the first straightening wheel 7001, the second straightening wheel 620, the movable measuring wheel 3016, the fixed measuring wheel 3017, the second traction wheel 510 and the second clamping wheel 520.

[0095] The above is an embodiment of the present invention. The above embodiments and the specific parameters in the embodiments are only for the purpose of clearly describing the verification process of the invention, and are not intended to limit the patent protection scope of the present invention. The patent protection scope of the present invention shall still be subject to its claims, and any equivalent structural changes made by using the contents of the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fully automatic straightening CNC steel bar bending machine, characterized in that: include: A frame (1), wherein a pre-straightening component (4), a steel bar detection component (3), a traction component (5), a straightening component (6), a bending component (9) and a shearing component (8) are fixed on the frame (1); A separate adjustable wheel assembly (7), the separate adjustable wheel assembly (7) is swingably connected to the straightening assembly (6), the separate adjustable wheel assembly (7) comprises a first straightening wheel (7001), an adjustable wheel assembly and a first driving mechanism, the first straightening wheel (7001) is rotatably connected to the straightening assembly (6), the adjustable wheel assembly is opposite to the first straightening wheel (7001), the adjustable wheel assembly comprises an adjustable wheel plate (7003) and two rotatably separate adjustable wheels (7004) mounted on both sides of the adjustable wheel plate (7003), and the first driving mechanism is used to drive the adjustable wheel plate (7003) to swing; Wherein, the first driving mechanism comprises: A first rotating shaft (7011), one end of which is fixedly connected to the adjustable wheel plate (7003), and the other end of which passes through the fixed straightening wheel plate (611) and is fixedly connected to the rotating arm (7007); A fine-tuning transmission joint (7008), wherein the fine-tuning transmission joint (7008) is hingedly connected to the strip hole of the rotating arm (7007) via a pin shaft (7013); A fine-tuning transmission shaft (7009), one end of which is threadedly connected to the fine-tuning transmission joint (7008), and the other end of which is connected to a first driving motor (7002) fixed on the fixed straightening wheel plate (611) and can be driven to rotate by the first driving motor (7002); Wherein, the connection hole at the hinged joint between the rotating arm (7007) and the fine-tuning transmission joint (7008) is a strip-shaped hole; Wherein, the steel bar detection component (3) comprises: A clamp-shaped bracket (3030), wherein the clamp-shaped bracket (3030) is formed by hingedly connecting two cross-arranged second connecting rods; A first elastic member (3050), wherein the upper and lower ends of the first elastic member (3050) are respectively fixedly connected to the tails of the two second connecting rods; A first linear displacement sensor (3040), wherein the upper and lower ends of the first linear displacement sensor (3040) are respectively hingedly connected to the tail ends of the two second connecting rods, and can distinguish between coiled round steel bars and coiled spiral steel bars; A measuring wheel assembly (3010), wherein the measuring wheel assembly (3010) is mounted at the front end of the second connecting rod and allows the steel bar (10) to be measured to pass between the two measuring wheel assemblies (3010); Wherein, the measuring wheel assembly (3010) comprises: A mounting seat (3014), wherein the mounting seat (3014) is fixedly connected to the front end of the second connecting rod; A rotary encoder (3011), wherein the rotary encoder (3011) is fixedly mounted on a mounting seat (3014); A measuring wheel axle (3015), one end of which is fixedly connected to a rotating shaft (3012) of a rotary encoder (3011), and a movable measuring wheel (3016) and a fixed measuring wheel (3017) are provided on the measuring wheel axle (3015); The measuring wheel shaft (3015) is fixedly connected to the rotating shaft (3012) of the rotary encoder (3011) via a coupling (3013); Wherein, two sets of adjustable wheel assemblies can be arranged side by side, and the first rotating shaft (7011) of the first driving mechanism of one of the adjustable wheel assemblies close to the fixed straightening wheel plate (611) is made into a sleeve (7012), which is sleeved on the first rotating shaft (7011) of the first driving mechanism of the other set of adjustable wheel assemblies; The length of the sleeve (7012) after extending out of the fixed straightening wheel plate (611) is smaller than the first rotating shaft (7011), and both are fixedly mounted on the rotating arm (7007); The first driving motor (7002) is fixed to the fixed straightening wheel plate (611) via a motor mounting plate (7010).

2. The fully automatic straightening CNC steel bar bending machine according to claim 1 is characterized in that: The straightening assembly (6) comprises: A bracket (610), wherein the bracket (610) comprises a fixed straightening wheel plate (611) and a movable straightening wheel plate (612); Second straightening wheels (620), a plurality of the second straightening wheels (620) are rotatably connected to a fixed straightening wheel plate (611) and a movable straightening wheel plate (612), and the second straightening wheels (620) on the fixed straightening wheel plate (611) and the movable straightening wheel plate (612) are staggeredly distributed; A lifting mechanism is symmetrically arranged on the fixed straightening wheel plate (611), and a lifting end of the lifting mechanism is connected to the movable straightening wheel plate (612).

3. The fully automatic straightening CNC steel bar bending machine according to claim 2, characterized in that: The lifting mechanism comprises: The lifting mechanism comprises a second driving motor (660) and a transmission shaft (640), the second driving motor (660) and the transmission shaft (640) are connected, the second driving motor (660) is fixed on a fixed straightening wheel plate (611), and the transmission shaft (640) and the movable straightening wheel plate (612) are threadedly connected.

4. The fully automatic straightening CNC steel bar bending machine according to claim 1, characterized in that: The invention also comprises an auxiliary feeding assembly (2), wherein the auxiliary feeding assembly (2) comprises: A first speed reducer (220); A third drive motor (210), the third drive motor (210) being connected to an input end of the first reducer (220); A first traction wheel (230), wherein the first traction wheel (230) is connected to an output end of the first reducer (220); A first cylinder (290), the first cylinder (290) being hinged on the frame (1); A clamping assembly, the clamping assembly comprising a first clamping wheel (240), a first connecting rod (270), a first clamping arm (280), a second rotating shaft (260) and a first fixed seat (250), wherein the first fixed seat (250) is fixed on the frame (1), the second rotating shaft (260) is hinged on the first fixed seat (250), the first connecting rod (270) is fixed on the second rotating shaft (260), the first clamping wheel (240) is fixed on the first connecting rod (270), one end of the first clamping arm (280) is hinged to the telescopic end of the first cylinder (290), the other end of the first clamping arm (280) is fixedly connected to the second rotating shaft (260), and the first clamping wheel (240) is opposite to the traction wheel.

5. The fully automatic straightening CNC steel bar bending machine according to claim 1, characterized in that: The traction assembly (5) comprises: Two second traction wheels (510), wherein the second traction wheels (510) are hinged to the frame (1), and an annular chain (560) is provided between the rotating shafts of the two second traction wheels (510); a fourth driving mechanism (570), wherein a driving shaft of the fourth driving mechanism (570) drives one of the second traction wheels (510) to rotate; A moving block assembly (550), the moving block assembly (550) comprising a moving block (551) and a second elastic member (552), the second elastic member (552) being fixed in a groove of the frame (1), the moving block (551) being fixed to the second elastic member (552) and moving in the groove; Two second pressing wheels (520), wherein the second pressing wheels (520) are hinged on the moving block (551), and the second pressing wheels (520) are opposite to the second traction wheel (510); A clamping mechanism pushes the moving block (551) to move in the groove.

6. The fully automatic straightening CNC steel bar bending machine according to claim 5, characterized in that: The clamping mechanism comprises: Bidirectional cylinder (530); A second clamping arm (540), the second clamping arm (540) comprises a driving arm (541) and a driven arm (542), one end of the driving arm (541) is hinged to the telescopic end of the bidirectional cylinder (530), the other end of the driving arm (541) is hinged to the driven arm (542), the other end of the second clamping arm (540) is hinged to the frame (1), and the second clamping arm (540) can squeeze the moving block (551) in the groove when rotating on the frame (1).

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