CN112224489A

CN112224489A - Automatic cutting and bundling device for building steel

Info

Publication number: CN112224489A
Application number: CN202011115016.9A
Authority: CN
Inventors: 李亚虎
Original assignee: Fuzhou Changle District Siat Technology Co ltd
Current assignee: Fuzhou Changle District Siat Technology Co ltd
Priority date: 2020-10-19
Filing date: 2020-10-19
Publication date: 2021-01-15

Abstract

The invention relates to the field related to building steel structures, and discloses an automatic cutting and binding device for building steel, which comprises a main body box, wherein a binding cavity with a leftward opening is arranged in the main body box, a cutting cavity is arranged on the right side of the binding cavity, a middle conveying cavity is communicated between the cutting cavity and the binding cavity, a conveying cavity with a rightward opening is communicated on the right side of the cutting cavity, the two steps of cutting and final bundling of a steel pipe to be processed are combined through a mechanical device, the working efficiency is greatly improved, the tightness of the pipe is ensured by using a binding mechanical mode, compared with manual work, the accident risk caused by the possibility of loosening in the subsequent transportation process is reduced, meanwhile, the device has certain operability, springs with different elastic coefficients can be adjusted and replaced according to requirements so as to achieve different quantities and different qualities of final bound finished products, the cutting process of the device is in a relatively closed space, the accident danger caused by irregular operation of workers in cutting is greatly reduced.

Description

Automatic cutting and bundling device for building steel

Technical Field

The invention relates to the field related to building steel structures, in particular to an automatic cutting and bundling device for building steel.

Background

Present tailorring to building steel mostly adopts means such as electric saw, in operation process, often can lead to the emergence of incident because workman's nonstandard operation, simultaneously after workman's tailorring is accomplished, follow-up need the manual work again with the steel collection of cutting into the section and bundle and prick, this process manual operation inefficiency, and consume a large amount of manpower resources, and because be artificial tying up, can't guarantee that last tying up has reliable fixed effect, if take place to tie up in the transportation and loose the slip, the steel that falls can cause the threat to workman's life safety.

Disclosure of Invention

The invention aims to provide an automatic building steel cutting and bundling device which can overcome the defects in the prior art, so that the practicability of equipment is improved.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to an automatic cutting and binding device for building steel, which comprises a main body box, wherein a binding cavity with a left opening is arranged in the main body box, a cutting cavity is arranged on the right side of the binding cavity, an intermediate conveying cavity is communicated and arranged between the cutting cavity and the binding cavity, a conveying cavity with a right opening is communicated and arranged on the right side of the cutting cavity, a binding belt wheel cavity extending backwards is arranged on the upper side of a binding plate, a knife spring is arranged on the rear side of the cutting cavity, a right conical tooth cavity is arranged on the rear side of the knife spring, a sleeve cavity is arranged on the left side of the right conical tooth cavity, a left conical tooth cavity is arranged on the left side of the sleeve cavity, the left conical tooth cavity is positioned on the lower side of the binding belt wheel cavity, a binding shaft extending downwards into the binding cavity is arranged in the binding belt wheel cavity, a binding plate is fixedly connected to the lower end face of the binding shaft, a sliding cavity is arranged in the binding plate, a, the sliding cavity is internally provided with sliding blocks which are symmetrically arranged front and back by taking the bundling shaft as a center, the sliding blocks are connected in a sliding fit manner in the sliding cavity, a rope fixing block which is downwards penetrated through the fixing block cavity is fixedly connected with the lower end surface of the sliding block, a lead screw is connected on the rope fixing block in a threaded fit manner, a pressing plate is connected on one side of the lead screw, which is far away from the bundling shaft, in a threaded fit manner, a nut is fixedly connected with the end surface of one side of the screw rod, which is far away from the bundling shaft, a butting spring is fixedly connected between the end surfaces of one side of the sliding blocks at two sides, which is near to the bundling shaft, a contact switch is fixedly connected with the end surface of one side of the sliding block close to the bundling shaft and penetrates through the abutting spring, and a rope is arranged in the bundling cavity, and two ends of the rope are respectively connected with the rope fixing blocks and the pressing plates on the front side and the rear side in a friction fit manner.

On the basis of the technical scheme, it runs through backward to tailor the intracavity the plug-in strip spring extends to the dish axle that cuts of right side awl tooth intracavity, it is equipped with to tailor the intracavity tie up the axle and cut the dish of axle symmetrical arrangement around the center, cut the dish and cut a dish axle fixed connection, under the initial condition, it is equipped with fixed rotating shaft to cut a dish up end fixed connection, the last normal running fit connection of fixed rotating shaft is equipped with and tailors the pole, the front side tailor pole right-hand member face fixed connection and be equipped with and tailor the pole, front side fixed block right-hand member face fixed connection is equipped with the front side plug-in strip, the pole right-hand member face fixed connection is tailor to the rear side is equipped with the rear side fixed block, it is equipped with the plug-in strip spring to tailor fixed connection between the pole between the relative side terminal surface.

On the basis of the technical scheme, the front end surface and the rear end surface of the cutting cavity are fixedly connected with pressure wheel fixing blocks which are symmetrically arranged by taking the bundling shaft as a center, the upper end surface of each pressure wheel fixing block is fixedly connected with a pressure wheel shaft, and the pressure wheels are rotatably matched and connected on the pressure wheel shafts.

On the basis of the technical scheme, a conveying wheel shaft extending backwards into the knife switch spring is arranged in the conveying cavity, a conveying rubber wheel fixedly connected with the conveying wheel shaft is arranged in the conveying cavity, a driven wheel shaft positioned on the lower side of the conveying wheel shaft is connected between the front end wall and the rear end wall of the conveying cavity in a rotating fit mode, a driven rubber wheel is fixedly connected onto the driven wheel shaft, a small driving belt wheel fixedly connected with the cutting disc shaft is arranged in the knife switch spring, a small driven belt wheel is fixedly connected onto the conveying wheel shaft, and an inclined belt is connected between the small driven belt wheel and the small driving belt wheel in a power fit mode.

On the basis of the technical scheme, a right driven bevel gear fixedly connected with the cutting disc shaft is arranged in the right bevel gear cavity, a lower side driven shaft extending leftwards into the sleeve cavity is arranged in the right bevel gear cavity, a left driven bevel gear fixedly connected with the lower side driven shaft is arranged in the right bevel gear cavity, the left driven bevel gear is meshed with the right driven bevel gear, a lower side driven gear fixedly connected with the lower side driven shaft is arranged in the sleeve cavity, a motor is fixedly connected with the left side of the sleeve cavity, a motor shaft extending rightwards into the sleeve cavity is fixedly connected with the right end face of the motor, a sleeve is arranged on the motor shaft in a spline fit connection manner, a sleeve spring is fixedly connected with the right end face of the sleeve cavity, an electromagnet is fixedly connected with the left end wall of the sleeve cavity, the sleeve is fixedly connected with a driving gear, and the driving gear is meshed with the lower side driven gear in an initial state.

On the basis of the technical scheme, an upper driven shaft extending leftwards into the left side bevel gear cavity is arranged in the sleeve cavity, an upper driven gear fixedly connected with the upper driven shaft is arranged in the sleeve cavity, a left side driving bevel gear fixedly connected with the upper driven shaft is arranged in the left side bevel gear cavity, a driving pulley shaft extending upwards into the bundling pulley cavity is arranged in the left side bevel gear cavity, a left side driven bevel gear meshed with the left side driving bevel gear is fixedly connected onto the driving pulley shaft, a driving pulley fixedly connected with the driving pulley shaft is arranged in the bundling pulley cavity, and a belt is arranged between the driving pulley and the driven pulley in a power fit connection mode.

The invention has the beneficial effects that: through mechanical device, will treat cutting and final two steps of closing up of processing steel pipe and merge, work efficiency has greatly been improved, use the mode of machinery to wrapping up of tubular product, compare in the manual work and guaranteed the compactibility of wrapping, the accident risk that probably loose and cause on the way of subsequent transportation expert has been reduced, the device has certain maneuverability simultaneously, can adjust the spring of changing different elastic coefficient according to the demand with this to reach the final different quantity of wrapping up the finished product, different quality, the device cut the process in relative inclosed space, the accident danger that brings because the nonstandard operation of workman's operation in cutting has greatly been reduced.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic view of the overall structure of an automatic cutting and binding apparatus for construction steel according to the present invention;

FIG. 2 is a schematic view of the structure A-A of FIG. 1;

FIG. 3 is a schematic diagram of B-B of FIG. 1;

FIG. 4 is a schematic diagram of the structure of C-C in FIG. 1;

FIG. 5 is a schematic diagram of D-D of FIG. 3;

fig. 6 is a schematic diagram of the structure of E-E in fig. 3.

Detailed Description

The invention will now be described in detail with reference to fig. 1-6, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

With reference to the accompanying drawings 1-6, the automatic cutting and bundling device for building steel comprises a main body box 10, a left bundling cavity 14 with an opening is arranged in the main body box 10, a right clipping cavity 24 is arranged on the right side of the bundling cavity 14, a middle conveying cavity 25 is arranged between the clipping cavity 24 and the bundling cavity 14 in a communicating manner, a right conveying cavity 20 with a right opening is arranged on the right side of the clipping cavity 24 in a communicating manner, a backward extending bundling pulley cavity 29 is arranged on the upper side of a bundling disk 11, a knife spring 35 is arranged on the rear side of the clipping cavity 24, a right bevel gear cavity 52 is arranged on the rear side of the knife spring 35, a sleeve cavity 55 is arranged on the left side of the right bevel gear cavity 52, a left bevel gear cavity 42 is arranged on the left side of the sleeve cavity 55, the left bevel gear cavity 42 is arranged on the lower side of the bundling pulley cavity 29, the bundling pulley cavity 29 extends downwards to a bundling shaft 27 in the bundling cavity 14, and a bundling disk 11 is fixedly connected to the, the binding plate 11 is internally provided with a sliding cavity 62, the lower side of the sliding cavity 62 is communicated with a fixed block cavity 63 with a downward opening, the sliding cavity 62 is internally provided with sliding blocks 61 which are symmetrically arranged around the binding shaft 27 as a center, the sliding blocks 61 are in sliding fit connection in the sliding cavity 62, the lower end surface of each sliding block 61 is fixedly connected with a rope fixed block 12 which downwards penetrates through the fixed block cavity 63, the rope fixed block 12 is provided with a lead screw 65 in threaded fit connection, one side of the lead screw 65, which is far away from the binding shaft 27, is provided with a pressing plate 64 in threaded fit connection, one side end surface of the lead screw 65, which is far away from the binding shaft 27, is fixedly connected with a nut 66, the sliding blocks 61 at two sides are fixedly connected with a butting spring 67 between the end surfaces of one side, which is near the binding shaft 27, and the sliding blocks 61 are fixedly, the contact switch 60 penetrates through the abutting spring 67, a rope 13 is arranged in the bundling cavity 14, and two ends of the rope 13 are respectively connected with the rope fixing blocks 12 on the front side and the rear side and the pressing plate 64 in a friction fit mode.

In addition, in one embodiment, a cutting disk shaft 16 which extends backwards through the knife spring 35 to the right bevel gear cavity 52 is arranged in the cutting cavity 24, the cutting cavity 24 is internally provided with cutting discs 15 which are symmetrically arranged in front and back by taking the binding shaft 27 as a center, the cutting disc 15 is fixedly connected with a cutting disc shaft 16, a fixed rotating shaft 23 is fixedly connected with the upper end surface of the cutting disc 15 in an initial state, the fixed rotating shaft 23 is connected with a cutting rod 22 in a rotating fit manner, the right end face of the cutting rod 22 at the front side is fixedly connected with the cutting rod 22, the right end face of the front fixing block 33 is fixedly connected with a front brake knife 32, the right end face of the rear cutting rod 22 is fixedly connected with a rear fixing block 30, the right end face of the rear fixing block 30 is fixedly connected with a rear knife switch 31, and a knife switch spring 35 is fixedly connected between the opposite side end faces of the cutting rods 22.

In addition, in one embodiment, the front end surface and the rear end surface of the cutting cavity 24 are fixedly connected with pressure wheel fixing blocks 38 which are symmetrically arranged by taking the bundling shaft 27 as a center, the upper end surface of each pressure wheel fixing block 38 is fixedly connected with a pressure wheel shaft 34, and the pressure wheel shaft 34 is rotatably connected with a pressure wheel 21 in a matching manner.

In addition, in one embodiment, a conveying wheel shaft 19 extending backwards into the guillotine spring 35 is arranged in the conveying cavity 20, a conveying rubber wheel 18 fixedly connected with the conveying wheel shaft 19 is arranged in the conveying cavity 20, a driven wheel shaft 17 positioned on the lower side of the conveying wheel shaft 19 is connected between the front end wall and the rear end wall of the conveying cavity 20 in a rotating fit mode, a driven rubber wheel 68 is fixedly connected with the driven wheel shaft 17, a small driving pulley 37 fixedly connected with the cutting disc shaft 16 is arranged in the guillotine spring 35, a small driven pulley 39 is fixedly connected with the conveying wheel shaft 19, and an inclined belt 36 is arranged between the small driven pulley 39 and the small driving pulley 37 in a power fit connection mode.

In addition, in one embodiment, a right driven bevel gear 50 fixedly connected with the cutting disc shaft 16 is arranged in the right bevel gear cavity 52, a lower driven shaft 49 extending leftwards into the sleeve cavity 55 is arranged in the right bevel gear cavity 52, a left driven bevel gear 51 fixedly connected with the lower driven shaft 49 is arranged in the right bevel gear cavity 52, the left driven bevel gear 51 is engaged with the right driven bevel gear 50, a lower driven gear 47 fixedly connected with the lower driven shaft 49 is arranged in the sleeve cavity 55, a motor 44 is fixedly connected with the left side of the sleeve cavity 55, a motor shaft 54 extending rightwards into the sleeve cavity 55 is fixedly connected with the right end face of the motor 44, a sleeve 46 is arranged on the motor shaft 54 in a spline fit connection manner, a sleeve spring 53 is fixedly connected with the right end face of the sleeve 46, and the right end face of the sleeve spring 53 is fixedly connected with the right end wall of the sleeve cavity 55, the left end wall of the sleeve cavity 55 is fixedly connected with an electromagnet 45, the sleeve 46 is fixedly connected with a driving gear 48, and in an initial state, the driving gear 48 is meshed with the lower driven gear 47.

In addition, in one embodiment, an upper driven shaft 57 extending leftward into the left side bevel gear chamber 42 is disposed in the sleeve chamber 55, an upper driven gear 56 fixedly connected to the upper driven shaft 57 is disposed in the sleeve chamber 55, a left side driving bevel gear 43 fixedly connected to the upper driven shaft 57 is disposed in the left side bevel gear chamber 42, a driving pulley shaft 58 extending upward into the strapping pulley chamber 29 is disposed in the left side bevel gear chamber 42, a left side driven bevel gear 41 engaged with the left side driving bevel gear 43 is fixedly connected to the driving pulley shaft 58, a driving pulley 40 fixedly connected to the driving pulley shaft 58 is disposed in the strapping pulley chamber 29, and a belt 28 is disposed between the driving pulley 40 and the driven pulley 26 in a power fit connection manner.

The fixing and connecting method in this embodiment includes, but is not limited to, bolting, welding, and the like.

As shown in fig. 1 to 6, in the initial state of the apparatus of the present invention, the driving gear 48 is engaged with the lower driven gear 47, the upper driven gear 56 is separated from the driving gear 48, and the two side sliding blocks 61 are located at the farthest positions; sequence of mechanical actions of the whole device: when the cutting machine starts to work, two ends of a rope 13 are respectively fixed between a left side bevel gear cavity 42 and a rope fixing block 12 on two sides through nuts 66, a motor 44 is started, the motor 44 drives a sleeve 46 to rotate through a motor shaft 54, the sleeve 46 drives a lower side driven gear 47 to rotate through a driving gear 48, the lower side driven gear 47 drives a left driven bevel gear 51 to rotate through a lower side driven shaft 49, the left driven bevel gear 51 drives a cutting disc shaft 16 to rotate through a right driven bevel gear 50, the cutting disc shaft 16 drives an inclined belt 36 to move through a small driving belt wheel 37, the inclined belt 36 drives a conveying wheel shaft 19 to move through a small driven belt wheel 39, the conveying wheel shaft 19 drives a conveying rubber wheel 18 to rotate, and steel to be processed is conveyed into a cutting cavity 24 through the matching between the conveying rubber wheel 18 and a driven rubber wheel 68; meanwhile, the cutting disc shaft 16 drives the cutting discs 15 on two sides to rotate, the cutting discs 15 on two sides drive the rear-side gate knife 31 and the front-side gate knife 32 to rotate by taking the cutting disc shaft 16 as the center through the cutting rod 22 and the fixed rotating shaft 23, when the cutting disc 15 moves to the position where the fixed rotating shaft 23 is positioned on the upper side of the cutting disc 15, the pressure wheels 21 on two sides extrude the rear-side fixing block 30 and the front-side fixing block 33 on the corresponding sides, the rear-side fixing block 30 and the front-side fixing block 33 overcome the elasticity of the gate knife spring 35 to rotate by taking the fixed rotating shaft 23 as the center in the direction close to the gate knife spring 35, under the action of the rear-side gate knife 31 and the front-side gate knife 32, steel is cut, and the cut part is pushed by the subsequent steel to be sent; the steel material which is cut into segments is collected in the rope 13, when the steel material in the rope 13 increases continuously, the rope 13 is stretched and deformed, the two-side sliding blocks 61 are driven to overcome the elastic force of the abutting springs 67 to approach, when the two-side contact switches 60 are contacted, the electromagnet 45 is triggered, the electromagnet 45 generates magnetic force, the sleeve 46 overcomes the elastic force of the sleeve spring 53 to slide leftwards under the suction force of the electromagnet 45, the driving gear 48 is separated from the lower driven gear 47, the driving gear 48 is meshed with the upper driven gear 56, at the moment, the conveying rubber wheel 18 stops rotating, the steel material stops being conveyed into the device, the driving gear 48 drives the upper driven shaft 57 to rotate through the upper driven gear 56, the upper driven shaft 57 drives the left driven bevel gear 41 to rotate through the left driving bevel gear 43, the left driven bevel gear 41 drives the driving pulley 40 to rotate through the driving pulley shaft 58, the driving pulley 40 drives the driven pulley 26 to, the driven belt wheel 26 drives the bundling disc 11 to rotate through the bundling shaft 27, the steel keeps static relative to the bundling cavity 14 due to the space limitation of the bundling cavity 14 to the steel, the bundling disc 11 drives the rope 13 to twist until the rope 13 tightens the steel, and at the moment, the processed steel can be collected by loosening the upper part of the rope 13, so that the subsequent transportation is facilitated.

The invention has the beneficial effects that: through mechanical device, will wait to process cutting of steel pipe and final two steps of tying up and merge, work efficiency has greatly been improved, use the mode of machinery to tying up of tubular product, compared in the manual work and guaranteed the compactibility of tying up, the accident risk that probably loose and cause in the way of subsequent transportation is expert has been reduced, the device has certain maneuverability simultaneously, can adjust the spring of changing different elastic coefficient according to the demand with this to reach the final different quantity of finished product of tying up, different quality, the device cut the process in relative inclosed space, the accident danger that brings because the nonstandard operation of worker's operation in cutting has greatly been reduced.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The utility model provides an automatic binding apparatus that cuts of building steel, includes the main part case, its characterized in that: the main box is internally provided with a binding cavity with a leftward opening, the right side of the binding cavity is provided with a cutting cavity, the cutting cavity is communicated with the binding cavity to be provided with a middle conveying cavity, the right side of the cutting cavity is communicated with a right conveying cavity, the upper side of the binding disk is provided with a binding belt wheel cavity extending backwards, the rear side of the cutting cavity is provided with a knife switch spring, the rear side of the knife switch spring is provided with a right bevel gear cavity, the left side of the right bevel gear cavity is provided with a sleeve cavity, the left side of the sleeve cavity is provided with a left bevel gear cavity, the left bevel gear cavity is positioned at the lower side of the binding belt wheel cavity, the binding belt wheel cavity is internally provided with a binding shaft extending downwards into the binding cavity, the lower end surface of the binding shaft is fixedly connected with the binding disk, the binding disk is internally provided with a sliding cavity, the lower side of the sliding cavity is communicated with a fixed block cavity with a downward opening, and the sliding blocks which, the sliding block is in sliding intracavity sliding fit connects, terminal surface fixed connection is equipped with and link up downwards under the sliding block the rope fixed block in fixed block chamber, screw-thread fit connects on the rope fixed block and is equipped with the lead screw, keep away from on the lead screw tie up one side screw-thread fit of axle and connect and be equipped with the clamp plate, the lead screw is kept away from tie up a side end fixed connection of axle and be equipped with the nut, both sides the sliding block is close to fixed connection is equipped with the butt spring between a side end of tying up the axle, the sliding block is close to a side end fixed connection of tying up the axle is equipped with contact switch, contact switch runs through the butt spring tie up the intracavity and be equipped with the rope, the rope both ends are connected with front and back both sides.

2. The automatic cutting and binding device for building steel according to claim 1, wherein: tailor the intracavity and be equipped with backward and run through the plug-in strip spring extends to right side awl tooth intracavity cut a set axle, tailor the intracavity be equipped with tie up the axle and coil the sanction dish of central front and back symmetrical arrangement, sanction dish with cut a set axle fixed connection, under the initial condition, it is equipped with fixed rotating shaft to cut a set up end fixed connection, the last normal running fit connection of fixed rotating shaft is equipped with tailors the pole, the front side tailor pole right-hand member face fixed connection and be equipped with tailors the pole, front side fixed block right-hand member face fixed connection is equipped with the front side plug-in strip, the pole right-hand member face fixed connection is equipped with the rear side fixed block to tailor the rear side, fixed connection is equipped with the plug-in strip spring between the relative side end face between tailorring the pole.

3. The automatic cutting and binding device for building steel according to claim 1, wherein: the front end face and the rear end face of the cutting cavity are fixedly connected with pressure wheel fixing blocks which are symmetrically arranged by taking the bundling shaft as a center, the upper end face of each pressure wheel fixing block is fixedly connected with a pressure wheel shaft, and the pressure wheels are connected to the pressure wheel shafts in a rotating fit mode.

4. The automatic cutting and binding device for building steel according to claim 1, wherein: the conveying cavity is internally provided with a conveying wheel shaft extending backwards into the knife switch spring, the conveying cavity is internally provided with a conveying rubber wheel fixedly connected with the conveying wheel shaft, a driven wheel shaft positioned on the lower side of the conveying wheel shaft is connected and arranged between the front end wall and the rear end wall of the conveying cavity in a rotating fit manner, the driven rubber wheel is fixedly connected onto the driven wheel shaft, a small driving belt wheel fixedly connected with the cutting disc shaft is arranged in the knife switch spring, a small driven belt wheel is fixedly connected onto the conveying wheel shaft, and an inclined belt is connected between the small driven belt wheel and the small driving belt wheel in a power fit manner.

5. The automatic cutting and binding device for building steel according to claim 1, wherein: a right driven bevel gear fixedly connected with the cutting disc shaft is arranged in the right bevel gear cavity, a lower driven shaft extending leftwards into the sleeve cavity is arranged in the right bevel gear cavity, a left driven bevel gear fixedly connected with the lower driven shaft is arranged in the right bevel gear cavity, the left driven bevel gear is meshed with the right driven bevel gear, a lower driven gear fixedly connected with the lower driven shaft is arranged in the sleeve cavity, a motor is fixedly connected with the left side of the sleeve cavity, a motor shaft extending rightwards into the sleeve cavity is fixedly connected with the right end surface of the motor, a sleeve is connected with the motor shaft in a spline fit manner, a sleeve spring is fixedly connected with the right end surface of the sleeve, the right end surface of the sleeve spring is fixedly connected with the right end wall of the sleeve cavity, an electromagnet is fixedly connected with the left end wall of the sleeve cavity, and a driving gear is fixedly connected with the sleeve, in an initial state, the driving gear is engaged with the lower driven gear.

6. The automatic cutting and binding device for building steel according to claim 1, wherein: an upper driven shaft extending leftwards into the left side bevel gear cavity is arranged in the sleeve cavity, an upper driven gear fixedly connected with the upper driven shaft is arranged in the sleeve cavity, a left side driving bevel gear fixedly connected with the upper driven shaft is arranged in the left side bevel gear cavity, a driving pulley shaft extending upwards into the bundling pulley cavity is arranged in the left side bevel gear cavity, a left side driven bevel gear meshed with the left side driving bevel gear is fixedly connected to the driving pulley shaft, a driving pulley fixedly connected with the driving pulley shaft is arranged in the bundling pulley cavity, and a belt is arranged between the driving pulley and the driven pulley in a power fit connection mode.