阅读说明：本技术 钢筋网焊接生产线的上步进轮机构 (Upper stepping wheel mechanism of reinforcing mesh welding production line ) 是由 安军亮 蒋凯明 贾世方 王艳敏 侯红敏 任孟霞 王焕景 庄振伟 于 2021-09-28 设计创作，主要内容包括：本发明公开了钢筋网焊接生产线的上步进轮机构,涉及钢筋网焊接生产线技术领域,其包括安装台、第一安装板、第二安装板、第三安装板,安装台一侧面固定连接有第一安装板,第一安装板上方设置有第二安装板,第二安装板一侧固定连接有第三安装板；第二安装板上方设置有U形板,U形板内部旋转连接有液压伸缩杆,液压伸缩杆输出端设置有推板,U形板一侧面设置有伺服电机；第一安装板上旋转连接有两第四安装板,两第四安装板之间旋转连接有上步进轮、备用上步进轮；两四安装板的端部设置有连接杆,连接杆外壁套设有套筒,套筒上固定连接有活动杆。解决了稳定性较差、易使得气缸受损、更换上步进轮效率较慢导致生产效率降低的问题。(The invention discloses an upper stepping wheel mechanism of a reinforcing mesh welding production line, which relates to the technical field of reinforcing mesh welding production lines and comprises an installation table, a first installation plate, a second installation plate and a third installation plate, wherein the first installation plate is fixedly connected to one side surface of the installation table; a U-shaped plate is arranged above the second mounting plate, a hydraulic telescopic rod is rotatably connected inside the U-shaped plate, a push plate is arranged at the output end of the hydraulic telescopic rod, and a servo motor is arranged on one side surface of the U-shaped plate; the first mounting plate is rotatably connected with two fourth mounting plates, and an upper stepping wheel and a standby upper stepping wheel are rotatably connected between the two fourth mounting plates; the end parts of the two four mounting plates are provided with connecting rods, the outer wall of each connecting rod is sleeved with a sleeve, and a movable rod is fixedly connected to each sleeve. The problem of relatively poor, easily make the cylinder impaired, change go up step wheel efficiency and lead to production efficiency to reduce is solved.)

1. Last step wheel mechanism of reinforcing bar net welding production line, including mount table (1), first mounting panel (2), second mounting panel (3), third mounting panel (11), its characterized in that: a first mounting plate (2) is fixedly connected to one side face of the mounting table (1), a second mounting plate (3) is arranged above the first mounting plate (2), and a third mounting plate (11) is fixedly connected to one side of the second mounting plate (3);

a U-shaped plate (4) is arranged above the second mounting plate (3), a hydraulic telescopic rod (6) is rotatably connected inside the U-shaped plate (4), a push plate (10) is arranged at the output end of the hydraulic telescopic rod (6), and a servo motor (8) is arranged on one side surface of the U-shaped plate (4);

the first mounting plate (2) is rotatably connected with two fourth mounting plates (17), and an upper stepping wheel (24) and a standby upper stepping wheel (26) are rotatably connected between the two fourth mounting plates (17);

connecting rods (20) are arranged at the end parts of the two four mounting plates (17), sleeves (21) are sleeved on the outer walls of the connecting rods (20), movable rods (22) are fixedly connected onto the sleeves (21), rolling wheels (32) are rotatably connected to the top ends of the movable rods (22), trapezoidal blocks (12) are arranged above the rolling wheels (32), and fixing blocks (15) are arranged above the trapezoidal blocks (12);

the outer wall of the movable rod (22) is provided with a spring plate (27), and a spring (28) is arranged between the spring plate (27) and the third mounting plate (11).

2. The stepping wheel mechanism of a mesh reinforcement welding line according to claim 1, wherein: the hydraulic telescopic rod is characterized in that a rotating plate (5) is arranged on the hydraulic telescopic rod (6), a first rotating shaft (7) is arranged between two side faces of the rotating plate (5) and the U-shaped plate (4), one end of the first rotating shaft (7) is welded with the rotating plate (5), the other end of the first rotating shaft (7) is fixedly connected with the output end of the servo motor (8), and a bearing is arranged at the joint of the U-shaped plate (4) and the first rotating shaft (7).

3. The stepping wheel mechanism of a mesh reinforcement welding line according to claim 1, wherein: one side that fixed block (15) are close to push pedal (10) is provided with cascaded fluting (16), cascaded fluting (16) and push pedal (10) phase-match, be provided with connecting rod (9) between hydraulic telescoping rod (6) output and push pedal (10).

4. The stepping wheel mechanism of a mesh reinforcement welding line according to claim 1, wherein: the novel ladder-shaped block is characterized in that a sliding block (13) is arranged below the ladder-shaped block (12), a sliding groove (14) matched with the sliding block (13) is formed in the upper surface of the third mounting plate (11), and the ladder-shaped block (12) is connected with the third mounting plate (11) in a sliding mode through the sliding block (13) arranged in the sliding groove (14).

5. The stepping wheel mechanism of a mesh reinforcement welding line according to claim 1, wherein: a movable groove (29) matched with the movable rod (22) is formed in the third mounting plate (11), a fifth mounting plate (30) is arranged at the top of the movable rod (22), and a fifth rotating shaft (31) is arranged between the fifth mounting plate (30) and the rolling wheel (32);

a rotating groove (19) is formed in the first mounting plate (2), and a second rotating shaft (18) is arranged between the rotating groove (19) and the fourth mounting plate (17).

6. The stepping wheel mechanism of a mesh reinforcement welding line according to claim 1, wherein: mounting panel (17) below fixedly connected with installation piece (34), it is provided with third pivot (23) to go up between step pulley (24) and mounting panel (17), it is reserve to go up and is provided with fourth pivot (25) between step pulley (26) and installation piece (34), third pivot (23), fourth pivot (25) are provided with swivel bearing (33) with mounting panel (17) junction.

7. The stepping wheel mechanism of a mesh reinforcement welding line according to claim 1, wherein: fixedly connected with T shape slider (35) on first mounting panel (2), be provided with on mount table (1) with T shape slider (35) assorted T-slot (36), fixedly connected with guide bar (37) in T-slot (36), be provided with on T shape slider (35) with guide bar (37) assorted guiding hole (38), T shape slider (35) directly are provided with spring (39) with T shape slot (36) lower surface.

Technical Field

The invention relates to the technical field of a reinforcing mesh welding production line, in particular to an upper stepping wheel mechanism of the reinforcing mesh welding production line.

Background

The reinforcing mesh welding production line is an automatic welding device for welding reinforcing steel bars in longitudinal and transverse directions into a grid shape, and a stepping mechanism in the reinforcing mesh welding production line drives a plurality of longitudinal reinforcing steel bars arranged at intervals to move to a welding position to be welded with the transverse reinforcing steel bars. Stepping mechanism of prior art includes that the structure is the same and a plurality of step-by-step units that the interval set up side by side, and every step-by-step unit structure all includes: a lower step wheel and a lower step wheel mechanism for supporting the reinforcing steel bar; an upper step wheel and an upper step wheel mechanism positioned above the lower step wheel; the driving mechanism drives the lower stepping wheel to rotate; the upper stepping wheel is driven to move downwards to press the pressing mechanism on the steel bar, when the pressing mechanism presses the upper stepping wheel on the longitudinal steel bar, the longitudinal steel bar moves forwards under the drive of the rotating lower stepping wheel. The tailstock of last step wheel cylinder of prior art articulates on the upper portion of support, and the piston rod of cylinder hinges in curb plate one end through cylinder round pin axle, and the curb plate other end articulates in the lower part of support, goes up step wheel and articulates in the recess of current curb plate one side through last step wheel axle, and the split pin will go up step wheel axle and inject on current curb plate.

The above-mentioned techniques have the following drawbacks: one, the cylinder directly articulates on the upper portion of support, lead to its stability relatively poor, two, the curb plate of installation step wheel is direct to be connected with the cylinder, and the activity direction of cylinder only is the horizontal direction, during the actual operation, because the power transmission of step wheel can make the step wheel have an ascending power down, easily make the cylinder impaired like this, three, go up the step wheel and easily wear and tear, need change the step wheel after the step wheel damages, however, it is slower to change step wheel efficiency, make production efficiency reduce.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides the upper stepping wheel mechanism of the reinforcing mesh welding production line, and solves the problems that the stability is poor, the air cylinder is easy to damage, and the production efficiency is reduced due to the slow efficiency of replacing the upper stepping wheel.

(II) technical scheme

In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: the upper stepping wheel mechanism of the reinforcing mesh welding production line comprises an installation table, a first installation plate, a second installation plate and a third installation plate, wherein the first installation plate is fixedly connected to one side surface of the installation table;

a U-shaped plate is arranged above the second mounting plate, a hydraulic telescopic rod is rotatably connected inside the U-shaped plate, a push plate is arranged at the output end of the hydraulic telescopic rod, and a servo motor is arranged on one side surface of the U-shaped plate;

the first mounting plate is rotatably connected with two fourth mounting plates, and an upper stepping wheel and a standby upper stepping wheel are rotatably connected between the two fourth mounting plates;

the end parts of the two four mounting plates are provided with connecting rods, sleeves are sleeved on the outer walls of the connecting rods, movable rods are fixedly connected onto the sleeves, the top ends of the movable rods are rotatably connected with rolling wheels, trapezoidal blocks are arranged above the rolling wheels, and fixed blocks are arranged above the trapezoidal blocks;

the outer wall of the movable rod is provided with a spring plate, and a spring is arranged between the spring plate and the third mounting plate.

Preferably, the hydraulic telescopic rod is provided with a rotating plate, first rotating shafts are respectively arranged between two side faces of the rotating plate and the U-shaped plate, one ends of the first rotating shafts are welded with the rotating plate, the other ends of the first rotating shafts are fixedly connected with the output end of the servo motor, and a bearing is arranged at the joint of the U-shaped plate and the first rotating shafts, so that the hydraulic telescopic rod is more stable and the rotation of the first rotating shafts is realized.

Preferably, one side that the fixed block is close to the push pedal is provided with cascaded fluting, cascaded fluting and push pedal phase-match, be provided with the connecting rod between hydraulic telescoping rod output and the push pedal to hydraulic telescoping rod output and push pedal's being connected have been realized.

Preferably, the slider is arranged below the trapezoidal block, the sliding groove matched with the slider is formed in the upper surface of the third mounting plate, and the trapezoidal block is connected with the third mounting plate in a sliding mode through the slider arranged in the sliding groove, so that the sliding of the trapezoidal block on the upper surface of the third mounting plate is achieved.

Preferably, the third mounting plate is provided with a movable groove matched with the movable rod, the top of the movable rod is provided with a fifth mounting plate, a fifth rotating shaft is arranged between the fifth mounting plate and the rolling wheel, so that the movable rod can move on the third mounting plate and the rolling wheel can rotate;

the rotary groove is formed in the first mounting plate, and the second rotary shaft is arranged between the rotary groove and the fourth mounting plate, so that the fourth mounting plate can rotate.

Preferably, mounting panel below fixedly connected with installation piece, it is provided with the third pivot to go up between step wheel and the mounting panel, be provided with the fourth pivot between step wheel and the installation piece on the reserve, third pivot, fourth pivot and mounting panel junction are provided with swivel bearing to step wheel, the rotation of reserve step wheel have been realized.

Preferably, fixedly connected with T shape slider on the first mounting panel, be provided with on the mount table with T shape slider assorted T-slot, T-slot internal fixation is connected with the guide bar, be provided with on the T shape slider with guide bar assorted guiding hole, T shape slider directly is provided with the spring with T-slot lower surface to realize the shock attenuation of first mounting panel.

(III) advantageous effects

The invention has the beneficial effects that:

1. this last step wheel mechanism of reinforcing bar net welding production line, be provided with the U-shaped board through second mounting panel top, the inside swivelling joint of U-shaped board has hydraulic telescoping rod, the hydraulic telescoping rod output is provided with the push pedal, a U-shaped board side is provided with servo motor, the last rotor plate that is provided with of hydraulic telescoping rod, be provided with first pivot between rotor plate both sides face and the U-shaped board respectively, two first pivot one end and rotor plate welding, the other end of two first pivots and servo motor's output fixed connection, the U-shaped board is provided with the bearing with the junction of first pivot, through installing hydraulic telescoping rod on the rotor plate of U-shaped inboard, when hydraulic telescoping rod atress perhaps need be rotatory, the rotation that realizes hydraulic telescoping rod through the rotation of rotor plate, make hydraulic telescoping rod more stable.

2. The upper stepping wheel mechanism of the reinforcing mesh welding production line is characterized in that connecting rods are arranged at the end parts of two four mounting plates, a sleeve is sleeved on the outer wall of each connecting rod, a movable rod is fixedly connected onto the sleeve, a rolling wheel is rotatably connected to the top end of each movable rod, a trapezoidal block is arranged above the rolling wheel, a fixed block is arranged above the trapezoidal block, a spring plate is arranged on the outer wall of each movable rod, a spring is arranged between the spring plate and a third mounting plate, when the upper stepping wheel needs to be pressed down, a hydraulic telescopic rod is driven to rotate through a servo motor to adjust the angle of the push plate, the push plate is butted with a proper position of a stepped groove according to requirements, the push plate generates thrust on the fixed block through the hydraulic telescopic rod, the trapezoidal block slides to generate pressure on the movable rod, so that the fourth mounting plate rotates by taking a second rotating shaft as a rotating shaft, the telescopic rod is pressed down, and the hydraulic pressure can not bear large thrust in the process, the hydraulic telescopic rod is prevented from being damaged.

3. This last step wheel mechanism of reinforcing bar net welding production line, swivelling joint has last step wheel between two fourth mounting panels, step wheel on the reserve, through when the impaired back of step wheel, it is rotatory directly to drive hydraulic telescoping rod through servo motor, adjust the angle of push pedal, dock push pedal and cascaded grooved suitable position according to the demand, make the push pedal produce thrust to the fixed block through hydraulic telescoping rod, make the trapezoidal piece slide and then produce pressure to the movable rod, thereby it is rotatory as the rotation axis to make the fourth mounting panel use the second pivot, realize reserve step wheel push down can, make production efficiency promote greatly.

Drawings

FIG. 1 is a schematic structural view of the present invention as a whole;

FIG. 2 is a schematic view of a trapezoidal block structure according to the present invention;

FIG. 3 is a schematic view of the spring structure of the present invention;

FIG. 4 is a schematic view of the rolling wheel structure of the present invention;

FIG. 5 is a schematic view of a rotating plate according to the present invention;

FIG. 6 is a schematic view of an upper step wheel structure according to the present invention;

FIG. 7 is a schematic diagram of a third mounting plate structure according to the present invention

Fig. 8 is a schematic structural diagram of a third mounting plate according to the present invention.

In the figure: 1. an installation table; 2. a first mounting plate; 3. a second mounting plate; 4. a U-shaped plate; 5. a rotating plate; 6. a hydraulic telescopic rod; 7. a first rotating shaft; 8. a servo motor; 9. a connecting rod; 10. pushing the plate; 11. a third mounting plate; 12. a trapezoidal block; 13. a slider; 14. a chute; 15. a fixed block; 16. step-type grooving; 17. a fourth mounting plate; 18. a second rotating shaft; 19. a rotating tank; 20. a connecting rod; 21. a sleeve; 22. a movable rod; 23. a third rotating shaft; 24. an upper step wheel; 25. a fourth rotating shaft; 26. an upper step wheel is reserved; 27. a spring plate; 28. a spring; 29. a movable groove; 30. a fifth mounting plate; 31. a fifth rotating shaft; 32. a rolling wheel; 33. a rotating bearing; 34. mounting blocks; 35. a T-shaped slider; 36. a T-shaped slot; 37. a guide bar; 38. a guide hole; 39. a spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 8, the present invention provides a technical solution: the upper stepping wheel mechanism of the reinforcing mesh welding production line comprises an installation table 1, a first installation plate 2, a second installation plate 3 and a third installation plate 11, wherein the first installation plate 2 is fixedly connected to one side surface of the installation table 1, the second installation plate 3 is arranged above the first installation plate 2, and the third installation plate 11 is fixedly connected to one side of the second installation plate 3;

a U-shaped plate 4 is arranged above the second mounting plate 3, a hydraulic telescopic rod 6 is rotatably connected inside the U-shaped plate 4, a push plate 10 is arranged at the output end of the hydraulic telescopic rod 6, and a servo motor 8 is arranged on one side surface of the U-shaped plate 4;

the first mounting plate 2 is rotatably connected with two fourth mounting plates 17, and an upper stepping wheel 24 and a standby upper stepping wheel 26 are rotatably connected between the two fourth mounting plates 17;

the end parts of the two four mounting plates 17 are provided with connecting rods 20, the outer wall of each connecting rod 20 is sleeved with a sleeve 21, a movable rod 22 is fixedly connected to each sleeve 21, the top end of each movable rod 22 is rotatably connected with a rolling wheel 32, a trapezoidal block 12 is arranged above each rolling wheel 32, and a fixed block 15 is arranged above each trapezoidal block 12;

the outer wall of the movable rod 22 is provided with a spring plate 27, and a spring 28 is arranged between the spring plate 27 and the third mounting plate 11.

The hydraulic telescopic rod 6 is provided with a rotating plate 5, first rotating shafts 7 are respectively arranged between two side surfaces of the rotating plate 5 and the U-shaped plate 4, one ends of the two first rotating shafts 7 are welded with the rotating plate 5, and the other ends of the two first rotating shafts 7 are fixedly connected with the output end of the servo motor 8, so that the hydraulic telescopic rod 6 is more stable; a bearing is arranged at the joint of the U-shaped plate 4 and the first rotating shaft 7, so that the first rotating shaft 7 rotates; one side of the fixed block 15 close to the push plate 10 is provided with a stepped slot 16, the stepped slot 16 is matched with the push plate 10, and a connecting rod 9 is arranged between the output end of the hydraulic telescopic rod 6 and the push plate 10, so that the output end of the hydraulic telescopic rod 6 is connected with the push plate 10; a sliding block 13 is arranged below the trapezoidal block 12, a sliding groove 14 matched with the sliding block 13 is arranged on the upper surface of the third mounting plate 11, and the trapezoidal block 12 is in sliding connection with the third mounting plate 11 through the sliding block 13 arranged in the sliding groove 14, so that the sliding of the trapezoidal block 12 on the upper surface of the third mounting plate 11 is realized; a movable groove 29 matched with the movable rod 22 is formed in the third mounting plate 11, a fifth mounting plate 30 is arranged at the top of the movable rod 22, and a fifth rotating shaft 31 is arranged between the fifth mounting plate 30 and the rolling wheel 32, so that the movable rod 22 can move on the third mounting plate 11 and the rolling wheel 32 can rotate; a rotating groove 19 is formed in the first mounting plate 2, and a second rotating shaft 18 is arranged between the rotating groove 19 and the fourth mounting plate 17, so that the fourth mounting plate 17 can rotate; an installation block 34 is fixedly connected below the installation plate 17, a third rotating shaft 23 is arranged between the upper stepping wheel 24 and the installation plate 17, a fourth rotating shaft 25 is arranged between the standby upper stepping wheel 26 and the installation block 34, and a rotating bearing 33 is arranged at the connection part of the third rotating shaft 23, the fourth rotating shaft 25 and the installation plate 17, so that the rotation of the upper stepping wheel 24 and the standby upper stepping wheel 26 is realized; fixedly connected with T shape slider 35 on the first mounting panel 2, be provided with on the mount table 1 with T shape slider 35 assorted T-slot 36, fixedly connected with guide bar 37 in the T-slot 36, be provided with on the T shape slider 35 with guide bar 37 assorted guiding hole 38, T shape slider 35 directly is provided with spring 39 with T shape 36 lower surfaces of slots to realize the shock attenuation of first mounting panel 2. The U-shaped plate 4 is arranged above the second mounting plate 3, the inside of the U-shaped plate 4 is rotatably connected with a hydraulic telescopic rod 6, the output end of the hydraulic telescopic rod 6 is provided with a push plate 10, one side surface of the U-shaped plate 4 is provided with a servo motor 8, the hydraulic telescopic rod 6 is provided with a rotating plate 5, first rotating shafts 7 are respectively arranged between two side surfaces of the rotating plate 5 and the U-shaped plate 4, one ends of the two first rotating shafts 7 are welded with the rotating plate 5, the other ends of the two first rotating shafts 7 are fixedly connected with the output end of the servo motor 8, a bearing is arranged at the joint of the U-shaped plate 4 and the first rotating shafts 7, the hydraulic telescopic rod 6 is mounted on the rotating plate 5 in the U-shaped plate 4, when the hydraulic telescopic rod 6 is stressed or needs to rotate, the rotation of the hydraulic telescopic rod 6 is realized through the rotation of the rotating plate 5, and the hydraulic telescopic rod 6 is more stable; the end parts of the two four mounting plates 17 are provided with connecting rods 20, the outer wall of the connecting rods 20 is sleeved with a sleeve 21, a movable rod 22 is fixedly connected to the sleeve 21, the top end of the movable rod 22 is rotatably connected with a rolling wheel 32, a trapezoidal block 12 is arranged above the rolling wheel 32, a fixed block 15 is arranged above the trapezoidal block 12, a spring plate 27 is arranged on the outer wall of the movable rod 22, a spring 28 is arranged between the spring plate 27 and the third mounting plate 11, when the upper stepping wheel 24 needs to be pressed down, a servo motor 8 drives a hydraulic telescopic rod 6 to rotate, the angle of the push plate 10 is adjusted, the push plate 10 is butted with the proper position of the stepped slot 16 according to requirements, the push plate 10 generates thrust to the fixed block 15 through the hydraulic telescopic rod 6, the trapezoidal block 12 slides to generate pressure to the movable rod 22, so that the fourth mounting plate 17 rotates by taking the second rotating shaft 18 as a rotating shaft, and the pressing of the upper stepping wheel 24 is realized, in the process, the hydraulic telescopic rod 6 cannot bear large thrust, so that the hydraulic telescopic rod 6 is prevented from being damaged; have step wheel 24 between two fourth mounting panels 17 swivelling joint, reserve step wheel 26 of going up, through when step wheel 24 impaired back, it is rotatory directly to drive hydraulic telescoping rod 6 through servo motor 8, the angle to push pedal 10 is adjusted, dock push pedal 10 and cascaded fluting 16's suitable position according to the demand, make push pedal 10 produce thrust to fixed block 15 through hydraulic telescoping rod 6, make trapezoidal piece 12 slide and then to the movable rod 22 production pressure, thereby it is rotatory as the rotation axis to make fourth mounting panel 17 use second pivot 18, realize reserve step wheel 26 push down can, make production efficiency promote greatly.

The method comprises the following operation steps:

s1, a U-shaped plate 4 is arranged above the second mounting plate 3, a hydraulic telescopic rod 6 is rotatably connected inside the U-shaped plate 4, a push plate 10 is arranged at the output end of the hydraulic telescopic rod 6, a servo motor 8 is arranged on one side surface of the U-shaped plate 4, a rotary plate 5 is arranged on the hydraulic telescopic rod 6, first rotary shafts 7 are respectively arranged between the two side surfaces of the rotary plate 5 and the U-shaped plate 4, one ends of the two first rotary shafts 7 are welded with the rotary plate 5, the other ends of the two first rotary shafts 7 are fixedly connected with the output end of the servo motor 8, a bearing is arranged at the joint of the U-shaped plate 4 and the first rotary shafts 7, the hydraulic telescopic rod 6 is mounted on the rotary plate 5 in the U-shaped plate 4, when the hydraulic telescopic rod 6 is stressed or needs to rotate, the rotation of the hydraulic telescopic rod 6 is realized through the rotation of the rotary plate 5, and the hydraulic telescopic rod 6 is more stable;

s2, connecting rods 20 are arranged at the end parts of two four mounting plates 17, a sleeve 21 is sleeved on the outer wall of the connecting rod 20, a movable rod 22 is fixedly connected onto the sleeve 21, a rolling wheel 32 is rotatably connected to the top end of the movable rod 22, a trapezoidal block 12 is arranged above the rolling wheel 32, a fixed block 15 is arranged above the trapezoidal block 12, a spring plate 27 is arranged on the outer wall of the movable rod 22, a spring 28 is arranged between the spring plate 27 and a third mounting plate 11, when the upper stepping wheel 24 needs to be pressed down, a servo motor 8 drives a hydraulic telescopic rod 6 to rotate to adjust the angle of a push plate 10, the push plate 10 is butted with a proper position of a stepped slot 16 as required, the push plate 10 generates thrust on the fixed block 15 through the hydraulic telescopic rod 6, the trapezoidal block 12 slides to generate pressure on the movable rod 22, so that the fourth mounting plate 17 rotates by taking a second rotating shaft 18 as a rotating shaft to realize the pressing down of the upper stepping wheel 24, in the process, the hydraulic telescopic rod 6 cannot bear large thrust, so that the hydraulic telescopic rod 6 is prevented from being damaged;

s3, swivelling joint has last step wheel 24 between two fourth mounting panels 17, step wheel 26 in reserve, through after last step wheel 24 is impaired, it is rotatory directly to drive hydraulic telescoping rod 6 through servo motor 8, adjust the angle of push pedal 10, dock push pedal 10 and cascaded fluting 16' S suitable position as required, make push pedal 10 produce thrust to fixed block 15 through hydraulic telescoping rod 6, make trapezoidal piece 12 slide and then produce pressure to movable rod 22, thereby it is rotatory as the rotation axis to make fourth mounting panel 17 use second pivot 18, realize reserve step wheel 26 push down can, make production efficiency promote greatly.

The above embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the electric devices such as the motors are commercially available products, and therefore, the models and the electrical connection relations thereof are not described.