CN112453922B

CN112453922B - Automatic production line for scaffold boards

Info

Publication number: CN112453922B
Application number: CN202011277644.7A
Authority: CN
Inventors: 朱志会
Original assignee: Jiangsu Guodian New Energy Equipment Co ltd
Current assignee: Jiangsu Guodian New Energy Equipment Co ltd
Priority date: 2020-11-16
Filing date: 2020-11-16
Publication date: 2022-02-22
Anticipated expiration: 2040-11-16
Also published as: CN112453922A

Abstract

The invention relates to an automatic production line of scaffold boards, which comprises an uncoiler, a leveling servo feeder, a punching machine, a rolling forming machine and an online seam welder, the uncoiler comprises a left machine body and a right machine body, a tension tube is rotatably arranged on the left machine body, a driving shaft with the main shaft and the tension tube at the same height is rotatably arranged on the right machine body, at least two sets of tension assemblies are arranged on the tension tube, each set of tension assembly comprises a tension plate located on the outer side of the tension tube, a top plate located in a tube cavity of the tension tube, a plurality of connecting rods connecting the tension plates and the top plate, and a pressure spring sleeved on the connecting rods and located between the tension tube and the top plate, one end of the pressure spring is in contact with the inner wall of the tension tube, the other end of the pressure spring is in contact with the outer wall of the top plate, and the top plates of the multiple sets of tension assemblies are surrounded to form a containing cavity with the size smaller than the outer diameter of the driving shaft. The automatic production line of the scaffold board is simple in structure and low in production cost.

Description

Automatic production line for scaffold boards

Technical Field

The invention relates to a rotary production line, in particular to an automatic production line of scaffold boards.

Background

The scaffold boards are also called scaffold pieces and are laid on scaffolds and operation frames, so that workers can walk above the scaffold boards, transfer materials and construct construction work conveniently, and the scaffold boards are a building material which can be used for temporary turnover. The scaffold needs to uncoil a roll of steel when producing, the levelling, punching press, multiple processes such as shearing, correspondingly, scaffold board production line needs to dispose equipment such as decoiler, the levelling machine, the punching machine, equipment such as cutter, in order to realize the production to the scaffold board, current scaffold board production line, the equipment arrangement who corresponds with each process is unreasonable, cause production efficiency to hang down, simultaneously the decoiler generally adopts the mode that the hydraulic pressure rises to rise the coil of steel and rises to rise in the frame of decoiler, the decoiler of this kind of tight mode of rising is comparatively complicated on the one hand, there is the risk of weeping simultaneously, thereby make the manufacturing cost of scaffold board higher.

In view of the above-mentioned drawbacks, the present designer is actively making research and innovation to create an automatic production line of scaffold boards with a novel structure, so that the production line has more industrial utility value.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide an automatic production line of scaffold boards, which is simple in structure and low in production cost.

The invention discloses an automatic production line of scaffold boards, which comprises an uncoiler, a leveling servo feeder, a punching machine, a rolling forming machine, an online seam welder, a straightener, a cutter and a conveying roller way, wherein the input end of the leveling servo feeder is positioned at the downstream of the output end of the uncoiler, the input end of the punching machine is positioned at the downstream of the output end of the leveling servo feeder, the input end of the rolling forming machine is positioned at the downstream of the output end of the punching machine, the input end of the online seam welder is positioned at the downstream of the output end of the rolling forming machine, the input end of the straightener is positioned at the downstream of the output end of the online seam welder, the input end of the conveying roller way is positioned at the downstream of the cutter, the uncoiler comprises a left machine body and a right machine body, a tension pipe is rotatably arranged on the left machine body, and a driving shaft with the main shaft and the tension pipe positioned at the same height is rotatably arranged on the right machine body, the tensioning device comprises a tensioning pipe, and is characterized in that at least two sets of tensioning assemblies are arranged on the tensioning pipe, each set of tensioning assembly comprises a tensioning plate located on the outer side of the tensioning pipe, a top plate located in the pipe cavity of the tensioning pipe, a plurality of connecting rods connecting the tensioning plates and the top plate, and a pressure spring sleeved on the connecting rods and located between the tensioning pipe and the top plate, one end of the pressure spring is in contact with the inner wall of the tensioning pipe, the other end of the pressure spring is in contact with the outer wall of the top plate, and the top plates of the sets of tensioning assemblies are surrounded to form a containing cavity with the size smaller than the outer diameter of a driving shaft.

Furthermore, in the automatic production line of the scaffold board, the connecting rod is provided with a limiting plate 26 positioned outside the tension tube.

Further, the automatic production line of the scaffold board comprises a mounting frame and support plates positioned on the left side and the right side of the mounting frame, roller sets positioned at the front end and the rear end of each support plate are arranged between the two support plates, each roller set comprises an upper roller shaft and a lower roller shaft positioned below the upper roller shaft, the two ends of the upper roller shaft and the two ends of the lower roller shaft are rotatably arranged on the support plates through bearings, the mounting frame is positioned between the two roller sets, sliders matched with the slide grooves on the inner side surfaces of the support plates are arranged on the left side wall and the right side wall of the mounting frame, an upper knife driving device for driving the upper knife to lift, a lower knife positioned right below the upper knife and a lower knife driving device for driving the lower knife to lift are arranged on the mounting frame, a photoelectric emitter is arranged on the upper knife, and a photoelectric receiver positioned right below the photoelectric emitter is arranged on the knife body of the lower knife, the cutting machine also comprises a mounting frame driving device for driving the mounting frame to slide along the sliding groove.

Furthermore, the automatic production line for the scaffold boards comprises a punching machine frame, wherein a punching hydraulic cylinder is arranged on the top wall of the punching machine frame, the output end of the punching hydraulic cylinder is fixedly connected with an upper die, a lower die fixedly connected with the punching machine frame is arranged below the upper die, a feeding roller set is arranged on one side of the punching machine frame, and a discharging roller set obliquely arranged downwards is arranged on the other side of the machine frame.

Further, the automatic production line for the scaffold boards is characterized in that a light curtain is arranged in the rack.

By the scheme, the invention at least has the following advantages: the automatic production line for the scaffold boards has the advantages that equipment arrangement corresponding to each process is reasonable, so that the whole production line can continuously perform production operation on the scaffold boards, the production efficiency of the scaffold boards is improved, at least two sets of tensioning assemblies are arranged in the tensioning pipes of the uncoiling machine, the end parts of the driving shafts can extend into the tensioning pipes from the opening ends of the tensioning pipes and stretch the top plates, and accordingly the tensioning function of steel coils is achieved.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

FIG. 1 is a schematic view showing the structure of an automatic production line for scaffold boards;

FIG. 2 is a schematic view of the structure of the punching machine;

fig. 3 is a schematic view of the structure of an unwinder;

FIG. 4 is a schematic structural diagram of the left body;

FIG. 5 is a schematic structural diagram of the right body;

FIG. 6 is a cross-sectional view of the tension tube when the driving rod is not entering the tension tube;

FIG. 7 is a cross-sectional view of the tension tube after the drive rod enters the tension tube;

FIG. 8 is a cross-sectional view of the tension tube;

fig. 9 is a schematic structural view of the tension assembly, wherein the compression spring is not shown;

FIG. 10 is a schematic top view of a cut-off machine;

FIG. 11 is a sectional view of the cutter.

In the figure, an uncoiler 1, a leveling servo feeder 2, a punching machine 3, a roll forming machine 4, an online seam welder 5, a straightener 6, a cutter 7, a conveying roller way 9, a left machine body 10, a right machine body 11, a tension tube 12, a driving shaft 13, a tension plate 14, a top plate 15, a connecting rod 16, a pressure spring 17, a containing cavity 18, a bottom plate 19, a first roller 20, an oil cylinder 21, a connecting plate 22, a connecting shaft 23, a positioning groove 24, a reinforcing rib plate 25, a limiting plate 26, a mounting frame 27, a supporting plate 28, a roller shaft group 29, an upper roller shaft 30, a lower roller shaft 31, a sliding block 32, an upper knife 33, an upper knife driving device 34, a lower knife 35, a lower knife driving device 36, a photoelectric emitter 37, a photoelectric receiver 38, a mounting frame driving device 39, a knife body 40, a screw rod 41, a base plate 42, a containing groove 43, a second roller 44, a punching rack 45, a punching hydraulic cylinder 46, an upper die 47, a lower die 48, a feeding roller set 49, a discharging roller set 50 and a light curtain 51.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Referring to fig. 1 to 11, an automatic production line for scaffold boards according to a preferred embodiment of the present invention includes an uncoiler 1, a leveling servo feeder 2, a punch 3, a roll forming machine 4, an online seam welder 5, a straightener 6, a cutter 7 and a roller conveyor 9, wherein an input end of the leveling servo feeder is located downstream of an output end of the uncoiler, an input end of the punch is located downstream of an output end of the leveling servo feeder, an input end of the roll forming machine is located downstream of an output end of the punch, an input end of the online seam welder is located downstream of an output end of the roll forming machine, an input end of the straightener is located downstream of an output end of the straightener, an input end of the roller conveyor is located downstream of the cutter, the uncoiler includes a left body 10 and a right body 11, a tension tube 12 is rotatably disposed on the left body, a driving shaft 13 having a main shaft and a tension tube at the same height is rotatably disposed on the right body, the tensioning device comprises a tensioning pipe, and is characterized in that at least two sets of tensioning assemblies are arranged on the tensioning pipe, each set of tensioning assembly comprises a tensioning plate 14 located on the outer side of the tensioning pipe, a top plate 15 located in a pipe cavity of the tensioning pipe, a plurality of connecting rods 16 connecting the tensioning plates and the top plate, and a pressure spring 17 sleeved on the connecting rods and located between the tensioning pipe and the top plate, one end of the pressure spring is in contact with the inner wall of the tensioning pipe, the other end of the pressure spring is in contact with the outer wall of the top plate, and the top plates of the plurality of sets of tensioning assemblies are surrounded to form a containing cavity 18 with the size smaller than the outer diameter of a driving shaft.

The automatic production line of the scaffold board has reasonable equipment arrangement corresponding to each process, so that the whole production line can continuously carry out production operation of the scaffold board, the production efficiency of the scaffold board is improved, at least two groups of tensioning assemblies are arranged in the tensioning pipe of the uncoiler, and the end part of the driving shaft can extend into the tensioning pipe from the opening end of the tensioning pipe and strut the top plate, thereby realizing the tensioning function of the steel coil. When the tension device works, the left machine body and the right machine body are separated under the action of the external driving device until the end part of the tension pipe and the end part of the driving shaft are separated by a preset distance. Then, an operator can sleeve the steel coil on the tensioning shaft through equipment such as a hoisting device or a walking trolley, and a certain gap is formed between the tensioning plate on the outer side of the tensioning tube and the inner side wall of the steel coil. After the steel coil is placed, the left machine body or the right machine body moves oppositely under the driving of the external driving device, and along with the movement of the left machine body or the right machine body, the driving shaft on the right machine body gradually extends into the tension pipe from the opening end of the tension pipe. In stretching into the tight pipe that rises gradually along with the drive shaft, the drive shaft also contacted with the medial surface of roof gradually, during the actual implementation, the drive shaft can set up to the reducing pipe of pipe diameter grow gradually, or sets up the terminal surface of drive shaft to the cambered surface, so that the tip that does benefit to the drive shaft stretches into the holding intracavity that the roof surrounds the formation. After the driving shaft completely enters the accommodating cavity, the size of the cross section of the accommodating cavity is smaller than the outer diameter of the driving shaft, the top plate is propped open by the driving shaft and moves towards the direction close to the inner wall of the tension tube, and then the connecting rod connected with the top plate and the tension plate connected with the connecting rod are driven to move outwards until the outer wall of the tension plate is in close contact with the inner wall of the steel coil, so that the steel coil is tensioned on the tension shaft. The tensioning shaft is driven by external driving force to rotate passively or driven by a motor to rotate actively, so that the steel coil is unfolded. The outer wall of the tensioning plate is preferably a curved surface matched with the inner wall of the steel coil, the inner wall of the top plate is a curved surface matched with the outer wall of the driving shaft, and adjacent top plates can be in direct contact or have a certain gap.

And a steel plate output from the uncoiler is input to a leveling servo feeder in the downstream direction of the uncoiler, and the leveling servo feeder is used for ensuring the necessary flatness of the plate and accurately feeding the plate in a fixed length. The automatic leveling device is composed of a feeding guide part, leveling rollers, a material guiding roller, a power part, a rack and the like, is driven by a servo motor, adopts 5 leveling rollers, adopts 2 pairs of guiding rollers at the front and the back, adopts a worm gear mechanism to adjust the lifting of the leveling rollers, and is convenient to adjust the gap between the leveling rollers. Through servo drive and control, can realize quick, the high accuracy pay-off of panel.

The plate output by the leveling servo feeder is output to a punching machine, the punching machine is used for punching under the control of a PLC, the punching machine is driven by a special mechanical press, and a guide pillar and a guide sleeve of a punching die are connected so as to ensure the integral rigidity and stability of the punching machine. The machine body surface is provided with a touch screen for setting length and automatically measuring the length, and when the measured length is reached, the plate is static, so that required holes, beads and gaps are punched on the plate.

The punched sheet is fed to a roll former downstream of the punch, which rolls the sheet to a specification within the design dimensional requirements. The device comprises a feeding guide, a base, a transmission unit, a frame, a forming roller mold, an auxiliary roller mold, a core mold and the like.

The rolled plate is input into an online seam welder, the online seam welder adopts a high-power seam welder to realize online tracking automatic seam welding, the welding quality and the working stability are enhanced, the maximum welding speed can reach 6m/min, and the requirement of a welding position is met.

The welded sheet is fed into a straightener. Due to the action of internal stress, the plate is easy to distort after being formed, and the defects of distortion of the plate and the like can be effectively eliminated after the three-roller straightening machine is adopted. And the high-precision use requirement is met.

The straightened sheet is fed into a cutting machine which shears the sheet on a die gap basis without stopping the production line. And outputting the cut plate through a conveying roller way.

Preferably, the left body and the right body are both disposed on the bottom plate 19, and the bottom surface of the bottom plate is provided with the first roller 20.

The setting of bottom plate and first gyro wheel for operating personnel is convenient for remove left organism or right organism, and during the actual implementation, the first gyro wheel of left organism or right organism can set up in the track on ground, and left organism or right organism pass through the drive of linear displacement device and remove, and this linear displacement device can be hydro-cylinder 21, cylinder or electric cylinder, and left organism or right organism also can realize removing through rack and pinion mechanism in addition, and its concrete structure is prior art, and here is no longer repeated. The linear displacement device may be located below the ground or floor and connected to the floor by a connecting plate 22. The left machine body or the right machine body is arranged at one end of the bottom plate, and the other end of the bottom plate can be provided with a balancing weight to increase the stability of the bottom plate. Preferably, the number of the tension assemblies is four, and the four tension assemblies are uniformly distributed around the central axis of the tension tube. A connecting shaft 23 is arranged on the left machine body, a bearing is arranged between the connecting shaft and the left machine body, and one end of the tension tube is connected with the connecting shaft. And a positioning groove 24 is formed in the inner side surface of the tension tube, and one end of the pressure spring is arranged in the positioning groove. The setting of constant head tank has realized the location to the pressure spring, and during the concrete implementation, the tight pipe that rises is formed by two half pipe amalgamations to in the processing installation to the tight pipe that rises. The spliced tensioning pipe is connected with the connecting shaft in a threaded or welding mode and the like. The pipe wall of the tension pipe is provided with a through hole for the connecting rod to pass in and out. The connecting rod can set up many to improve the roof and the tight board that rises between be connected the steadiness. A reinforcing rib plate 25 is arranged between the connecting rod and the tensioning plate. The arrangement of the reinforcing rib plate further improves the stability of the tension plate.

Preferably, in the automatic production line of scaffold boards of the present invention, the connecting rod is provided with a limiting plate 26 located outside the tension tube.

The limiting plate realizes the limiting function of the top plate and the tensioning plate. Specifically, the top plate moves towards the direction close to the center shaft of the tensioning tube under the action of the elastic force of the pressure spring until the limiting plate is in contact with the outer wall of the tensioning tube, so that the top plate and the tensioning plate are limited. The medial surface of limiting plate sets up to the curved surface with the tight outer wall adaptation of rising, and limiting plate accessible threaded connection's mode is connected with the connecting rod moreover to adjust the position of limiting plate, and then realize the adaptation function to having different hole coil of strip.

Preferably, the automatic production line of the scaffold board comprises a mounting frame 27, support plates 28 positioned at the left side and the right side of the mounting frame, roller shaft groups 29 positioned at the front end and the rear end of each support plate are arranged between the two support plates, each roller shaft group comprises an upper roller shaft 30 and a lower roller shaft 31 positioned below the upper roller shaft, both ends of the upper roller shaft and both ends of the lower roller shaft are rotatably arranged on the support plates through bearings, the mounting frame is positioned between the two roller shaft groups, slide blocks 32 matched with slide grooves on the inner side surfaces of the support plates are arranged on the left side wall and the right side wall of the mounting frame, an upper knife 33, an upper knife driving device 34 for driving the upper knife to lift, a lower knife 35 positioned right below the upper knife and a lower knife driving device 36 for driving the lower knife to lift are arranged on the mounting frame, a photoelectric emitter 37 is arranged on the knife body of the upper knife, a photoelectric receiver 38 positioned right below the photoelectric emitter is arranged on the knife body of the lower knife, the cutting machine further comprises a mounting frame driving device 39 for driving the mounting frame to slide along the chute.

The cutter realizes the linear displacement drive of the mounting frame through the arrangement of the mounting frame driving device, so that the cutter can move along with the movement of the scaffold board, and then an upper cutter and a lower cutter on the mounting frame can punch the moving plate. Wherein, photoelectric emitter and photoelectric receiver's setting for the position of installing frame ability accurate positioning scaffold board, thereby carry out accurate die-cut to scaffold board. When the device works, a formed scaffold board is input into a roller shaft group at one end of a supporting plate from one end of a tracking cutting machine and is gradually transmitted to an installation frame from between an upper roller shaft and a lower roller shaft of the roller shaft group, when the device passes through the installation frame, an optical signal sent by a photoelectric emitter on an upper knife body is shielded by a scaffold board body and cannot be transmitted to a photoelectric receiver on a lower knife body until a positioning hole on the scaffold board is just positioned between the photoelectric emitter and a light path of the photoelectric receiver, the photoelectric receiver receives light sent by the photoelectric emitter and generates a corresponding electric signal, an external control center immediately starts an installation frame driving device after receiving the signal to drive the installation frame to move along a chute, the control center can control the driving speed of the installation frame according to preset data or calculate the moving speed of the scaffold board through data acquired by sensors such as a photoelectric sensor or a distance sensor and the like, and then the driving speed of the mounting frame is subjected to feedback control so that the speed of the mounting frame is matched with the moving speed of the scaffold board. And simultaneously, the upper knife driving device and the lower knife driving device which are positioned on the mounting frame respectively drive the upper knife and the lower knife to move oppositely until the upper knife and the lower knife cut off the scaffold board. The scaffold board is output from the roller shaft group at the other end of the supporting plate after being cut off, and meanwhile, the mounting frame is driven by the mounting frame driving device to restore to the original position to wait for the next punching. The upper cutter driving device, the lower cutter driving device and the mounting frame driving device are all linear displacement driving devices, the upper cutter driving device and the lower cutter driving device are preferably air cylinders, the mounting frame driving device is preferably a motor screw rod type linear displacement driving device, feedback control over a motor is achieved through an encoder connected with a motor spindle, and then control over the driving speed and distance of the mounting frame is achieved. The optoelectronic transmitter and the optoelectronic receiver can be preferably a laser transmitter and a laser receiver. The positioning holes in the plate are punched and formed by an upstream punching device. In addition, a laser distance sensor can be arranged on the cutter body of the upper cutter or the lower cutter, and the laser distance sensor can be used for acquiring the surface form of the scaffold board through scanning the surface of the scaffold board and carrying out auxiliary positioning and speed calculation on the scaffold board according to the surface form.

The lower cutter driving device comprises two lower cutter cylinders arranged on the bottom wall of the mounting frame, and the output ends of the lower cutter cylinders are fixedly connected with the cutter bodies of the lower cutters.

Preferably, the upper knife driving device is an upper knife cylinder arranged on the top wall of the mounting frame, and the output end of the upper knife cylinder is fixedly connected with the knife body of the lower knife.

Preferably, a cutter body limiting groove 40 matched with the upper cutter and the lower cutter is arranged on the side wall of the mounting frame.

The cutter body limiting groove is arranged to position the upper cutter and the lower cutter, so that deviation cannot occur in the lifting process of the cutter body limiting groove.

Preferably, the mounting frame driving device is a mounting frame driving motor, an output shaft of the mounting frame driving motor is connected with the lead screw 41, and the lead screw is in threaded connection with the mounting frame.

The installation frame driving motor is arranged to drive the installation frame in a linear displacement mode, an output shaft of the installation frame driving motor drives the screw rod to rotate during working, and the installation frame in threaded connection with the screw rod moves back and forth along the sliding groove in the supporting plate along with the rotation of the screw rod.

Preferably, a substrate 42 is disposed below the mounting frame, and the bottom end of the supporting plate is fixed on the substrate.

Preferably, the surface of the base plate is provided with a receiving groove 43 for placing the drag chain.

Preferably, the bottom wall of the mounting frame is provided with a second roller 44.

Preferably, the automatic production line of the scaffold board comprises a punching machine 45, wherein a punching hydraulic cylinder 46 is arranged on the top wall of the punching machine, the output end of the punching hydraulic cylinder is fixedly connected with an upper die 47, a lower die 48 fixedly connected with the punching machine is arranged below the upper die, a feeding roller set 49 is arranged on one side of the punching machine, and a discharging roller set 50 obliquely and downwards is arranged on the other side of the machine.

The discharging roller set arranged obliquely downwards enables the scaffold board to be more easily discharged after being punched.

Preferably, the automatic production line for scaffold boards of the present invention has a light curtain 51 disposed in the frame.

The arrangement of the light curtain is beneficial to the observation of an operator on the stamping process so as to ensure the stamping quality

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description.

In addition, the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention. Also, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a scaffold board automatic production line, includes decoiler (1), levelling servo feeder (2), piercing press (3), roll-in make-up machine (4), online seam welder (5), straightener (6), cutter (7) and rollgang (9), its characterized in that: the input of levelling servo feeder is located the low reaches of decoiler output, the input of piercing press is located the low reaches of levelling servo feeder output, the input of roll-in make-up machine is located the low reaches of piercing press output, the input of online seam welder is located the low reaches of roll-in make-up machine output, the input of straightener is located the low reaches of online seam welder output, the input of cutter is located the low reaches of straightener output, the input of rollgang is located the low reaches of cutter, the decoiler includes left organism (10) and right organism (11), rotationally is provided with tight pipe (12) that rises on the left organism, rotationally is provided with main shaft and the drive shaft (13) that rises and is located the same height on the right organism, be provided with at least two sets of tight subassemblies that rise on the tight pipe, every group tight subassembly that rises is including the tight board (14) that rises that is located the outside the tight pipe, The tensioning device comprises a top plate (15) located in a tube cavity of a tensioning tube, a plurality of connecting rods (16) connecting a tensioning plate and the top plate, and a pressure spring (17) sleeved on the connecting rods and located between the tensioning tube and the top plate, wherein one end of the pressure spring is in contact with the inner wall of the tensioning tube, the other end of the pressure spring is in contact with the outer wall of the top plate, and the top plates of a plurality of groups of tensioning assemblies are surrounded to form a containing cavity (18) with the size smaller than the outer diameter of a driving shaft.

2. The automatic production line of scaffold boards of claim 1, characterized in that: the connecting rod is provided with a limiting plate (26) positioned outside the tension tube.

3. The automatic production line of scaffold boards of claim 1, characterized in that: the cutting machine comprises a mounting frame (27) and supporting plates (28) positioned on the left side and the right side of the mounting frame, roller shaft groups (29) positioned at the front end and the rear end of each supporting plate are arranged between the two supporting plates, each roller shaft group comprises an upper roller shaft (30) and a lower roller shaft (31) positioned below the upper roller shaft, the two ends of the upper roller shaft and the two ends of the lower roller shaft are rotatably arranged on the supporting plates through bearings, the mounting frame is positioned between the two roller shaft groups, sliding blocks (32) matched with sliding grooves on the inner side surfaces of the supporting plates are arranged on the left side wall and the right side wall of the mounting frame, an upper cutter (33), an upper cutter driving device (34) for driving the upper cutter to lift, a lower cutter (35) positioned right below the upper cutter and a lower cutter driving device (36) for driving the lower cutter to lift are arranged on the left side wall and the right side wall of the mounting frame, a photoelectric emitter (37) is arranged on the cutter body of the upper cutter, and a photoelectric receiver (38) positioned right below the photoelectric emitter is arranged on the cutter body of the lower cutter, the cutting machine also comprises a mounting frame driving device (39) for driving the mounting frame to slide along the sliding groove.

4. The automatic production line of scaffold boards of claim 1, characterized in that: the punching machine comprises a punching rack (45), a punching hydraulic cylinder (46) is arranged on the top wall of the punching rack, the output end of the punching hydraulic cylinder is fixedly connected with an upper die (47), a lower die (48) fixedly connected with the punching rack is arranged below the upper die, a feeding roller set (49) is arranged on one side of the punching rack, and a discharging roller set (50) which is inclined downwards is arranged on the other side of the rack.

5. The automatic production line of scaffold boards of claim 4, characterized in that: a light curtain (51) is arranged in the frame.