CN114147147A

CN114147147A - Steel bar cutting device with adjustable size for lead mould steel bar truss

Info

Publication number: CN114147147A
Application number: CN202111396363.8A
Authority: CN
Inventors: 李�荣; 谭文斐
Original assignee: Jiangxi Jianbang Technology Co ltd
Current assignee: Jiangxi Jianbang Technology Co ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-03-08

Abstract

The invention relates to a size-adjustable steel bar cutting device, in particular to a size-adjustable steel bar cutting device for a lead mould steel bar truss. The technical problem of the invention is that: the size-adjustable steel bar cutting device of the lead mould steel bar truss can adjust the cutting size of the steel bar truss and can avoid the spark from sputtering people. The utility model provides a device is cuted to adjustable size's of lead mould steel bar truss reinforcing bar, including mount pad, cylinder, crane, slip post etc. the mount pad top left and right sides all is provided with the cylinder, is provided with the crane between the telescopic link top of cylinder, and the crane bottom is controlled both sides and all is connected with the slip post. According to the invention, the rotary frame and the extrusion pipe are driven to rotate through the rotation of the reference circle, so that the extrusion pipe moves inwards to extrude the movable column, and further the rubber chuck clamps the steel bar truss tightly, and the steel bar truss can be fixed.

Description

Steel bar cutting device with adjustable size for lead mould steel bar truss

Technical Field

The invention relates to a size-adjustable steel bar cutting device, in particular to a size-adjustable steel bar cutting device for a lead mould steel bar truss.

Background

In the process of manufacturing the steel bar truss, the steel bar truss after being manufactured generally needs to be cut off so as to be convenient for using each place, the volume ratio of the steel bar truss is large, therefore, in the cutting process, a lot of troubles can occur, the operation is very complicated, and equipment specially used for cutting is also arranged at present.

Patent application number is CN201621055740.6 steel bar truss production line is with automatic device that cuts, be equipped with the support frame of clipper including the feed end, support frame one side is equipped with the truss landing frame, the clipper passes through PLC control, support frame opposite side backup pad, backup pad upper portion sliding connection has second limit switch, and the support frame upper surface that is located the discharge gate below of clipper is fixed with first limit switch, sliding connection has at least one pusher in the backup pad between first limit switch, the second limit switch, PLC is connected to first limit switch, second limit switch signal end.

Although this automatic cut-off device for steel bar truss production line can decide steel bar truss through the clipper, can't realize adjusting the size that steel bar truss decided, the easy splash of mars that produces in the cutting injures people moreover, consequently research and development now can realize adjusting the size that steel bar truss decided and can avoid mars splash and injures people's the adjustable size's of lead mould steel bar truss device.

Disclosure of Invention

In order to overcome the defects that the cutting size of the steel bar truss cannot be adjusted and sparks are easy to splash to people in the automatic cutting device for the existing steel bar truss production line, the invention has the technical problems that: the size-adjustable steel bar cutting device of the lead mould steel bar truss can adjust the cutting size of the steel bar truss and can avoid the spark from sputtering people.

The utility model provides a but lead mould steel bar truss size-adjusting's reinforcing bar cuts device, including the mount pad, the cylinder, the crane, the slip post, the cutterbar, mechanism and guiding mechanism blow, the mount pad top left and right sides all is provided with the cylinder, be provided with the crane between the telescopic link top of cylinder, the crane bottom left and right sides all is connected with the slip post, slip post and mount pad sliding type connect, be provided with the cutterbar that is used for cutting the reinforcing bar in the crane, be provided with the mechanism of blowing that is used for blowing mars on the mount pad, be provided with the guiding mechanism that is used for adjusting the steel bar truss on the mount pad.

Further, the blowing mechanism comprises a fixed disc, a rotating shaft, a reference circle, a fan, volute spiral springs and descending columns, the fixed disc is arranged on the left side and the right side of the upper portion of the mounting seat, the reference circle is rotatably connected to the front side of the top of the fixed disc, threaded grooves are formed in the reference circle, the volute spiral springs are arranged between the lower portion of the reference circle and the adjacent fixed disc, the descending columns are arranged on the front side of the lifting frame, the rotating shaft is arranged on the top of the reference circle, and the fan is arranged on the rotating shaft.

Further, the adjusting mechanism comprises a supporting plate, a fixed plate, a sliding rod and a sliding plate, the fixed plate is arranged on the left side and the right side of the front side of the upper portion in the mounting seat, the supporting plate is arranged on the left side and the right side of the front side of the top of the mounting seat, the supporting plate is located above the fixed plate, the sliding rod is connected with the left side and the right side of the rear side of the upper portion in the mounting seat in a sliding mode, the sliding plate is arranged on the rear side of the sliding rod, and the sliding plate is located above the fixed plate.

Further explain, still including fixed establishment, fixed establishment is including hollow tube, the trompil dish, the removal post, rubber chuck, the rotating turret, extrusion pipe and first spring, the left and right sides of front side all is provided with the hollow tube in the mount pad, all sliding type connection has the trompil dish on the hollow tube, all be provided with first spring between trompil dish and the adjacent hollow tube inner wall, all be provided with the removal post on the trompil dish, both sides all are connected with the rubber chuck that can fix the steel bar truss around the removal post, the reference circle lower part all is provided with the rotating turret, the rotating turret bottom outside all is provided with the extrusion pipe, the extrusion pipe can extrude the removal post.

Further explain, still including the cooling mechanism that can cool down the cutter, cooling mechanism is including the decline board, a piston, the second spring, liquid deposits the pipe, atomizer and spiral cover, the equal front and back symmetry in the left and right sides on crane upper portion is provided with the decline board, equal front and back symmetry detachable of the equal front and back in mount pad upper portion left and right sides is provided with the liquid that is used for depositing water and deposits the pipe, equal sliding type connection has the piston in the liquid deposit pipe, all be provided with the second spring between piston upper portion and the adjacent liquid deposit pipe, equal threaded connection has the spiral cover on the liquid deposit pipe, liquid deposit pipe lower part all is provided with the atomizer that can spout liquid.

Further, the anti-toppling mechanism can prevent the steel bar truss from toppling over and comprises a first bearing seat, a first rotating column and a bearing plate, wherein the first bearing seat is arranged on the outer sides of the bottoms of the supporting plate and the sliding plate, the first rotating column is rotatably connected between the first bearing seats on the same transverse side, and the bearing plate is arranged on the first rotating column.

Further explain, still including the protection machanism that can play the guard action, protection machanism is including the secondary shaft bearing, the second column spinner, the open-close board, connecting pipe and fire prevention cloth, the left and right sides of mount pad upper portion rear side all is provided with the secondary shaft bearing, equal rotary type is connected with the second column spinner on the secondary shaft bearing, all be provided with the open-close board that can carry out the protection on the second column spinner, the open-close board rear portion all is provided with the connecting pipe, around the roll having the fire prevention cloth that can prevent mars splatter between the connecting pipe.

Further, the fire-proof cloth has elasticity.

The invention has the beneficial effects that: 1. according to the invention, the lifting frame and the cutter can be lifted by controlling the telescopic rod of the air cylinder to move, so that the cutter can automatically cut off the steel bar truss, and the spark can be blown backwards by the fan, so that the spark is prevented from splashing on the skin of people.

2. According to the invention, the steel bar truss can move back and forth by moving the sliding plate, so that the size of the steel bar truss can be adjusted.

3. According to the invention, the rotary frame and the extrusion pipe are driven to rotate through the rotation of the reference circle, so that the extrusion pipe moves inwards to extrude the movable column, and further the rubber chuck clamps the steel bar truss tightly, and the steel bar truss can be fixed.

Drawings

Fig. 1 is a schematic perspective view of a first embodiment of the present invention.

Fig. 2 is a schematic perspective view of a second embodiment of the present invention.

FIG. 3 is a schematic view of a first partial body structure according to the present invention.

FIG. 4 is a schematic view of a second partial body structure according to the present invention.

Fig. 5 is a schematic perspective view of a first blowing mechanism according to the present invention.

Fig. 6 is a schematic perspective view of a second blowing mechanism according to the present invention.

Fig. 7 is a schematic partial perspective view of the blowing mechanism of the present invention.

Fig. 8 is a schematic perspective view of an adjusting mechanism according to the present invention.

Fig. 9 is a schematic perspective view of the fixing mechanism of the present invention.

Fig. 10 is a partial perspective sectional view of the fastening mechanism of the present invention.

Fig. 11 is a schematic perspective view of the cooling mechanism of the present invention.

Fig. 12 is a schematic view of a first partially-separated body structure of the cooling mechanism of the present invention.

FIG. 13 is a schematic view of a second partial structure of the cooling mechanism of the present invention.

Fig. 14 is a schematic perspective view of the anti-toppling mechanism of the present invention.

Fig. 15 is a perspective view of the protection mechanism of the present invention.

Reference numbers in the drawings: 1: mount pad, 11: cylinder, 12: crane, 13: sliding column, 14: cutter, 2: blowing mechanism, 20: fixed disk, 21: rotating shaft, 22: reference circle, 23: fan, 24: scroll spring, 25: descending column, 3: adjustment mechanism, 30: support plate, 31: fixing plate, 32: slide bar, 33: sliding plate, 4: fixing mechanism, 40: hollow tube, 41: perforated disc, 42: moving column, 43: rubber chuck, 44: rotating frame, 45: extruded tube, 46: first spring, 5: cooling mechanism, 50: descending plate, 51: piston, 52: second spring, 53: liquid storage tube, 54: atomizer, 55: screwing a cover, 6: anti-toppling mechanism, 60: first bearing seat, 61: first spin column, 62: receiving plate, 7: guard mechanism, 70: second bearing housing, 71: second rotating column, 72: open-close plate, 73: connecting pipe, 74: fire-proof cloth.

Detailed Description

The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which presently preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for completeness and fully convey the scope of the invention to the skilled person.

Example 1

The utility model provides a device is cut to adjustable size's of lead mould steel bar truss reinforcing bar, as shown in fig. 1-8, including mount pad 1, cylinder 11, crane 12, slip post 13, cutterbar 14, blast mechanism 2 and guiding mechanism 3, cylinder 11 has all been welded to the 1 top left and right sides of mount pad, be equipped with crane 12 between the telescopic link top of cylinder 11, crane 12 bottom left and right sides all is connected with slip post 13,

slip post

13 and 1 sliding type connection of mount pad, be equipped with cutterbar 14 in the crane 12, be used for cutting the reinforcing bar, be equipped with blast mechanism 2 on the mount pad 1, be used for blowing mars, avoid mars to splash people on one's body, be equipped with guiding mechanism 3 on the mount pad 1, be used for adjusting the steel bar truss, and then realize adjusting the size of steel bar truss.

Blowing mechanism 2 is including fixed disk 20, the pivot 21, reference circle 22, fan 23, volute spiral spring 24 and decline post 25, the 1 upper portion left and right sides of mount pad all is equipped with fixed disk 20 through the bolt, the equal rotary type in fixed disk 20 top front side is connected with reference circle 22, threaded groove has all been opened on the reference circle 22, all be equipped with volute spiral spring 24 between reference circle 22 lower part and the adjacent fixed disk 20, crane 12 front side is equipped with decline post 25, decline post 25 left and right sides can slide on the threaded groove, decline post 25 reciprocates and can drive reference circle 22 and rotate, reference circle 22 top all is equipped with pivot 21, all be equipped with fan 23 in the pivot 21, fan 23 can blow the mars, prevent that the mars from spattering to people on one's body.

Adjustment mechanism 3 is including backup pad 30, fixed plate 31, slide bar 32 and sliding plate 33, the left and right sides of upper portion front side all is equipped with fixed plate 31 through the bolt in mount pad 1, backup pad 30 has all been welded to the left and right sides of mount pad 1 top front side, backup pad 30 is located fixed plate 31 top, the equal sliding type in left and right sides of upper portion rear side has slide bar 32 in mount pad 1, slide bar 32 rear side all is equipped with sliding plate 33, sliding plate 33 is located fixed plate 31 top, can make steel bar truss's position remove through removing sliding plate 33, sliding plate 33 and backup pad 30 can support steel bar truss.

When people need to cut off the steel bar truss, the device can be used for operation, firstly, the steel bar truss can be placed between the supporting plate 30 and the sliding plate 33, then the sliding rod 32 and the sliding plate 33 can be moved back and forth according to the length of the steel bar truss and the size of the steel bar truss to be cut, the sliding rod 32 and the sliding plate 33 are driven to move back and forth to drive the steel bar truss to move back and forth to be adjusted, so that the size of the steel bar truss can be adjusted, then the air cylinder 11 and the cutter 14 are started, the telescopic rod of the air cylinder 11 is contracted to drive the lifting frame 12 and the cutter 14 to move downwards, the cutter 14 moves downwards to cut off the steel bar truss, the lifting frame 12 moves downwards to drive the descending column 25 to move downwards, the descending column 25 moves downwards to drive the scroll index circle 22 to rotate through the threaded groove, the spring 24 is twisted, the index circle 22 rotates to drive the fan 23 to rotate inwards, open fan 23 simultaneously, in the cutting process, can send the spark, under the effect that fan 23 blew, can blow the spark backward, avoid the spark to spatter on people's skin, and then cause the injury, accomplish the back of cutting off, can control cylinder 11's telescopic link to carry out the extension motion and drive crane 12, cutterbar 14 and descending post 25 move upwards, under volute spring 24's effect, descending post 25 moves upwards simultaneously and drives the reversal of reference circle 22 through the thread groove and reset, and then drive fan 23 and rotate and reset, close cylinder 11 afterwards, fan 23 and cutterbar 14, take out steel bar truss afterwards.

Example 2

On the basis of the embodiment 1, as shown in fig. 1, fig. 2, fig. 9 and fig. 10, the device further comprises a fixing mechanism 4, wherein the fixing mechanism 4 comprises a hollow tube 40 and a perforated disc 41, remove post 42, rubber chuck 43, rotating turret 44, extrusion pipe 45 and first spring 46, hollow tube 40 has all been welded to the left and right sides of front side in mount pad 1, all sliding type connection has trompil dish 41 on the hollow tube 40, all be equipped with first spring 46 between trompil dish 41 and the adjacent hollow tube 40 inner wall, first spring 46 can drive trompil dish 41 and reset, all be equipped with on the trompil dish 41 and remove post 42, both sides all are connected with rubber chuck 43 around removing post 42, can fix the steel bar truss, reference circle 22 lower part all is equipped with rotating turret 44, reference circle 22 rotates and can drive rotating turret 44 and rotate, rotating turret 44 bottom outside all is equipped with extrusion pipe 45, extrusion pipe 45 can extrude removal post 42.

After the steel bar truss is placed, the reference circle 22 rotates to drive the rotating frame 44 to rotate inwards, the rotating frame 44 rotates inwards to drive the extrusion pipe 45 to rotate inwards, the extrusion pipe 45 can extrude the moving column 42 to drive the moving column 42 to move inwards, the moving column 42 moves inwards to drive the rubber chuck 43 and the hole opening disc 41 to move inwards, the first spring 46 is stretched, the rubber chuck 43 moves inwards to clamp and fix the steel bar truss, and the steel bar truss can be prevented from shaking in the cutting process, so that the cutting effect can be influenced; the reference circle 22 rotates reversely to drive the rotating frame 44 and the extrusion pipe 45 to rotate outwards to reset, the extrusion pipe 45 rotates outwards to reset and can be far away from the moving column 42, the perforated disc 41 is driven to move outwards to reset under the action of the first spring 46, the perforated disc 41 moves outwards to reset and drives the moving column 42 and the rubber chuck 43 to move outwards, and the rubber chuck 43 moves outwards to loosen the steel bar truss.

As shown in fig. 1, fig. 2, fig. 11, fig. 12 and fig. 13, the cutting device 14 can be cooled by a cooling mechanism 5, the cooling mechanism 5 comprises a descending plate 50, a piston 51, a second spring 52, a liquid storage pipe 53, an atomizing nozzle 54 and a screw cap 55, the descending plate 50 is welded symmetrically in front and back on the left and right sides of the upper part of the lifting frame 12, the liquid storage pipe 53 for storing water is detachably arranged symmetrically in front and back on the left and right sides of the upper part of the mounting seat 1, be used for depositing water, equal sliding connection has piston 51 in the liquid storage tube 53, all is equipped with second spring 52 between piston 51 upper portion and the adjacent liquid storage tube 53, and second spring 52 can drive piston 51 and reset, and equal screw thread formula is connected with spiral cover 55 on the liquid storage tube 53, and liquid storage tube 53 lower part all is equipped with the atomizer 54 that can spout liquid, can realize the cooling effect.

People can open the screw cap 55, then water is filled into the liquid storage pipes 53, then the liquid storage pipes 53 are respectively installed on the installation seat 1, the lifting frame 12 moves downwards to drive the descending plate 50 to move downwards, the descending plate 50 moves downwards to extrude the piston 51, the second spring 52 is compressed, water is sprayed out of the cutter 14 through the atomizing nozzle 54, and therefore the cutter 14 can be cooled; the lifting frame 12 moves upwards to drive the descending plate 50 to move upwards, and when the descending plate 50 moves upwards and is separated from the piston 51, the piston 51 is driven to move upwards to reset under the action of the second spring 52.

As shown in fig. 1, 2 and 14, the steel bar truss anti-toppling device further comprises an anti-toppling mechanism 6 capable of preventing the steel bar truss from toppling over, the anti-toppling mechanism 6 comprises a first bearing seat 60, a first rotating column 61 and a bearing plate 62, the first bearing seats 60 are welded on the outer sides of the bottoms of the supporting plate 30 and the sliding plate 33, the first rotating columns 61 are rotatably connected between the first bearing seats 60 on the same transverse side, and the bearing plates 62 are arranged on the first rotating columns 61.

Because the length of the steel bar truss can be longer, before cutting, the bearing plate 62 can be rotated upwards, so that the bearing plate 62 is flush with the sliding plate 33 and the supporting plate 30 respectively, then the steel bar truss is placed between the sliding plate 33 and the supporting plate 30, so that the bearing plate 62 can support the front side and the rear side of the steel bar truss, and after cutting is completed, the bearing plate 62 can be rotated downwards to be reset.

As shown in fig. 1, fig. 2 and fig. 15, still include protection machanism 7, can play the guard action, protection machanism 7 is including second bearing frame 70, second column spinner 71, the plywood 72, connecting pipe 73 and fire prevention cloth 74, second bearing frame 70 has all been welded to the left and right sides of mount pad 1 upper portion rear side, the equal rotary type is connected with second column spinner 71 on second bearing frame 70, all be equipped with plywood 72 on the second column spinner 71, can protect, plywood 72 rear portion all is equipped with connecting pipe 73, around rolling up fire prevention cloth 74 between the connecting pipe 73, can prevent mars splatter, fire prevention cloth 74 has the elasticity.

When people place the steel bar truss, the steel bar truss is pushed backwards, the opening plate 72 and the connecting pipe 73 are enabled to rotate outwards, the fireproof cloth 74 is enabled to be stretched, the fireproof cloth 74 can block the rear side of the steel bar truss, and in the cutting process, the fireproof cloth 74 and the opening plate 72 can block sparks, so that the sparks are prevented from being splashed; when the cutting is completed, the person takes out the steel bar truss, and under the elastic action of the fireproof cloth 74, the connecting pipes 73 are made to approach each other, and the opening plate 72 is made to swing and reset.

The technical principle of the embodiment of the present invention is described above in conjunction with the specific embodiments. The description is only intended to explain the principles of embodiments of the invention and should not be taken in any way as limiting the scope of the embodiments of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive step, and these embodiments will fall within the scope of the present invention.

Claims

1. The utility model provides a device is cut to adjustable size's of lead mould steel bar truss reinforcing bar, including mount pad (1), cylinder (11), crane (12), slip post (13) and cutterbar (14), mount pad (1) top left and right sides all is provided with cylinder (11), be provided with crane (12) between the telescopic link top of cylinder (11), crane (12) bottom left and right sides all is connected with slip post (13), slip post (13) and mount pad (1) sliding type connection, be provided with cutterbar (14) that are used for cutting the reinforcing bar in crane (12), a serial communication port, still including blowing mechanism (2) and guiding mechanism (3), be provided with blowing mechanism (2) that are used for blowing mars on mount pad (1), be provided with guiding mechanism (3) that are used for adjusting the truss reinforcing bar on mount pad (1).

2. The steel bar cutting device with the adjustable size for the lead mould steel bar truss is characterized in that the blowing mechanism (2) comprises fixed discs (20), rotating shafts (21), reference circles (22), fans (23), volute springs (24) and descending columns (25), the fixed discs (20) are arranged on the left side and the right side of the upper portion of the mounting seat (1), the reference circles (22) are rotatably connected to the front sides of the tops of the fixed discs (20), threaded grooves are formed in the reference circles (22), the volute springs (24) are arranged between the lower portions of the reference circles (22) and the adjacent fixed discs (20), the descending columns (25) are arranged on the front sides of the lifting frames (12), the rotating shafts (21) are arranged at the tops of the reference circles (22), and the fans (23) are arranged on the rotating shafts (21).

3. The size-adjustable steel bar cutting device for the lead mould steel bar truss according to claim 2, wherein the adjusting mechanism (3) comprises a supporting plate (30), a fixing plate (31), a sliding rod (32) and a sliding plate (33), the fixing plate (31) is arranged on each of the left side and the right side of the front side of the upper portion in the mounting seat (1), the supporting plates (30) are arranged on each of the left side and the right side of the front side of the top portion of the mounting seat (1), the supporting plates (30) are located above the fixing plates (31), the sliding rod (32) is connected to each of the left side and the right side of the rear side of the upper portion in the mounting seat (1) in a sliding mode, the sliding plate (33) is arranged on the rear side of the sliding rod (32), and the sliding plate (33) is located above the fixing plate (31).

4. The size-adjustable steel bar cutting device for the lead mould steel bar truss is characterized by further comprising a fixing mechanism (4), wherein the fixing mechanism (4) comprises a hollow pipe (40), a perforated disc (41), a movable column (42), a rubber chuck (43), a rotating frame (44), an extrusion pipe (45) and first springs (46), the hollow pipe (40) is arranged on the left side and the right side of the inner front side of the mounting seat (1), the perforated disc (41) is connected to the hollow pipe (40) in a sliding mode, the first springs (46) are arranged between the perforated disc (41) and the inner wall of the adjacent hollow pipe (40), the movable column (42) is arranged on the perforated disc (41), the rubber chucks (43) capable of fixing the steel bar truss are connected to the front side and the rear side of the movable column (42), and the rotating frame (44) is arranged on the lower portion of the reference circle (22), the outer sides of the bottoms of the rotating frames (44) are provided with extrusion pipes (45), and the extrusion pipes (45) can extrude the moving columns (42).

5. The steel bar cutting device with the adjustable size for the lead-die steel bar truss is characterized by further comprising a cooling mechanism (5) capable of cooling a cutter (14), wherein the cooling mechanism (5) comprises a descending plate (50), a piston (51), a second spring (52), a liquid storage pipe (53), an atomizing nozzle (54) and a screw cap (55), the descending plate (50) is symmetrically arranged at the front and back of the left side and the right side of the upper portion of the lifting frame (12), the liquid storage pipe (53) used for storing water is symmetrically and detachably arranged at the front and back of the left side and the right side of the upper portion of the mounting seat (1), the piston (51) is slidably connected in the liquid storage pipe (53), the second spring (52) is arranged between the upper portion of the piston (51) and the adjacent liquid storage pipe (53), the screw cap (55) is screwed on the liquid storage pipe (53), the lower parts of the liquid storage pipes (53) are provided with atomizing nozzles (54) which can spray liquid.

6. The device for cutting off the size-adjustable steel bars of the lead-mode steel bar truss according to claim 5, characterized by further comprising an anti-toppling mechanism (6) capable of preventing the steel bar truss from toppling over, wherein the anti-toppling mechanism (6) comprises a first bearing seat (60), a first rotating column (61) and a bearing plate (62), the first bearing seats (60) are respectively arranged on the outer sides of the bottoms of the supporting plate (30) and the sliding plate (33), the first rotating columns (61) are rotatably connected between the first bearing seats (60) on the same transverse side, and the bearing plates (62) are respectively arranged on the first rotating columns (61).

7. The size-adjustable steel bar cutting device for the lead die steel bar truss is characterized by further comprising a protection mechanism (7) capable of playing a protection role, wherein the protection mechanism (7) comprises a second bearing seat (70), a second rotating column (71), an open-close plate (72), a connecting pipe (73) and fireproof cloth (74), the second bearing seat (70) is arranged on the left side and the right side of the rear side of the upper portion of the mounting seat (1), the second rotating column (71) is rotatably connected onto the second bearing seat (70), the open-close plate (72) capable of protecting is arranged on the second rotating column (71), the connecting pipe (73) is arranged on the rear portion of the open-close plate (72), and the fireproof cloth (74) capable of preventing sparks from splashing is wound between the connecting pipes (73).

8. The adjustable-size bar cutoff device for lead-mode steel trusses according to claim 7, wherein the fire-proof cloth (74) has elasticity.