Fixed-length cutting device for pipe fittings of bridge protective fences

Abstract

The invention relates to the technical field of cutting machinery, in particular to a bridge protective fence pipe fitting fixed-length cutting device which comprises a cutting table, a clamping mechanism and a positioning mechanism. A cutting extension table is arranged on the right side of the cutting table. A cutting mechanism is arranged at the upper end of the cutting extension table. The clamping mechanism comprises a hydraulic cylinder, an arc-shaped plate, a positioning wheel and a driving wheel, the left side and the right side of the upper end of the cutting table are each provided with two evenly-distributed rotating tables, the interiors of the rotating tables are rotationally connected with the driving wheels which are symmetrically distributed left and right, and the left end and the right end of the bottom wall of the cutting table are each fixedly connected with a supporting plate; the upper ends of the supporting plates are fixedly connected with hydraulic cylinders which are evenly distributed, the upper ends of the telescopic ends of the hydraulic cylinders are rotationally connected with arc-shaped plates, and every two arc-shaped plates which are adjacent left and right are symmetrically distributed. According to the fixed-length cutting device for the bridge protective fence pipe fitting, the pipe fitting can be conveniently placed and taken down through the open type fixing mechanism, meanwhile, the pipe fitting can be positioned, and the safety and the operation efficiency in the cutting operation process are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal processing, in particular to a fixed-length cutting device for bridge guardrail pipe fittings. Background Art

[0002] The bridge guardrail is made of welded steel pipes. At the construction site, the pipes are cut to fixed lengths according to on-site needs. The cutting equipment used is a manual cutting machine or a cutting platform. In the former manual cutting operation method, the operator holds the cutting machine and cuts around the pipe in a circumferential manner. During the process, not only sparks fly, but the pipe lacks a positioning mechanism, and the safety factor is low. The second is an automated cutting method. The pipe is hoisted at the designated position of the cutting platform. After the pipe is positioned, the cutting equipment and the pipe are rotated relative to each other to achieve the cutting operation, and the safety of the operation is guaranteed. However, the cutting position needs to be fine-tuned, and it needs to be moved with the help of lifting equipment, which greatly reduces its flexibility and reduces the cutting efficiency. Summary of the invention

[0003] The present invention provides a fixed-length cutting device for bridge guardrail pipe fittings, which facilitates the placement and removal of pipe fittings through an open fixing mechanism and can position the pipe fittings at the same time, thereby effectively improving the safety and operation efficiency of the cutting operation process.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for cutting bridge guardrail pipes to fixed length, comprising a cutting table, a clamping mechanism and a positioning mechanism; A cutting extension platform is arranged on the right side of the cutting platform, and a cutting mechanism is arranged on the upper end of the cutting extension platform; The clamping mechanism includes a hydraulic cylinder, an arc-shaped plate, a positioning wheel and a driving wheel. Two evenly distributed rotating tables are provided on the left and right sides of the upper end of the cutting table. The interior of the rotating tables is rotatably connected to driving wheels symmetrically distributed on the left and right. The left and right ends of the bottom wall of the cutting table are fixedly connected to support plates. The upper ends of the support plates are fixedly connected to evenly distributed hydraulic cylinders. The upper ends of the telescopic ends of the hydraulic cylinders are rotatably connected to the arc-shaped plates. The two adjacent arc-shaped plates on the left and right are symmetrically distributed. The rotating tables are respectively located between the two adjacent arc-shaped plates on the left and right. The upper and lower ends of the arc-shaped plates are rotatably connected to positioning wheels. The oil inlets of the hydraulic cylinders are connected to the oil outlets of the external oil pumps. The positioning mechanism is arranged at the front end of the cutting table.

[0005] Furthermore, the clamping mechanism also includes motor 1, motor seat, sprocket 1 and sprocket 2. The bottom wall of the cutting table is fixedly connected with evenly distributed bearing seats, the front end of the bottom wall of the cutting table is fixedly connected with the motor seat, a rotating shaft is rotatably connected between the motor seat and each bearing seat, the outer sleeve of the rotating shaft is provided with evenly distributed sprocket 1, the front ends of the four driving wheels at the front end and the rear ends of the four driving wheels at the rear end are each provided with sprocket 2, sprocket 1 and two vertically adjacent sprockets 2 are connected through chain 1 transmission, the front end of the bottom wall of the cutting table is fixedly connected with motor 1, and the output shaft of motor 1 is fixedly connected to the right end of the rotating shaft.

[0006] Furthermore, the positioning mechanism includes a fixing seat four, a fixing seat, a baffle and a screw rod two. The left and right ends of the front upper end of the cutting table are fixedly connected to the fixing seats four distributed front and rear. The screw rod two is rotatably connected between the two fixing seats four on the same side of the left and right sides. The outside of the screw rod two is threadedly connected to the fixing seat, and the baffle is connected between the upper ends of the two fixing seats by bolts.

[0007] Furthermore, the positioning mechanism includes a motor four, a fixed seat three and a sprocket two. The front end of the front side of the upper end of the cutting table is fixedly connected to the fixed seat three. The front end of the screw rod two is rotatably connected to the middle part of the fixed seat three. The front end of the screw rod two is fixedly sleeved with a sprocket two. The sprocket two is located between the fixed seat three and the adjacent fixed seat four on the same side on the left and right. The two sprockets two are connected through a chain two transmission. The front side surface of the fixed seat three on the right side is fixedly connected to the motor four. The output shaft of the motor four is fixedly connected to the front end of the screw rod two on the right side.

[0008] Furthermore, the cutting mechanism includes a fixed seat 1, a cutting disc, a motor cover, a motor 2, a slider, a screw rod 1, a fixed seat 2 and a motor 3. The middle part of the upper surface of the cutting table is fixedly connected with the fixed seat 1, the upper surface of the cutting extension table is fixedly connected with the fixed seat 2, the upper surface of the whole consisting of the cutting table and the cutting extension table is fixedly connected with a guide rail, the guide rail is located between the fixed seat 1 and the fixed seat 2, the screw rod 1 is rotatably connected between the fixed seat 1 and the fixed seat 2, the right side of the fixed seat 2 is fixedly connected with the motor 3, the output shaft of the motor 3 is fixedly connected to the right end of the screw rod 1, the middle part of the screw rod 1 is threadedly connected with the slider, the slider is slidably connected to the upper end of the guide rail, the upper end of the slider is fixedly connected with the motor cover and the motor 2, the motor 2 is located inside the motor cover, the rear end of the slider is rotatably connected to the cutting disc through a rotating shaft, and the output shaft of the motor 2 is fixedly connected to the front end of the rotating shaft.

[0009] Furthermore, the cutting mechanism also includes a movable baffle, a fixed baffle, an arc groove and a positioning bolt. The rear end of the sliding block is fixedly connected to the fixed baffle, and the upper end of the fixed baffle is slidably connected to the movable baffle. The cutting blade is located inside the fixed baffle and the movable baffle. An arc groove is provided on the edge of the upper end of the fixed baffle. The positioning bolt passes through the through hole and the arc groove of the movable baffle. The front end of the positioning bolt is threadedly connected to a nut to avoid sparks to the greatest extent.

[0010] Furthermore, a distance measuring sensor 1 is fixedly connected to the upper end of the fixing seat 2, and the distance measuring sensor 1 corresponds to the left and right positions of the motor cover.

[0011] Furthermore, it also includes a mounting seat, which is evenly fixedly connected to the top wall of the cutting table, and the lower end of the mounting seat is fixedly connected with a second ranging sensor, and the second ranging sensor is respectively located between two adjacent driving wheels at the upper end.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The fixed-length cutting device for bridge guardrail pipes disclosed in the present application comprises two driving wheels on the same rotating table and adjacent arc-shaped plates on the left and right sides forming a V-shape. The cutting blade cuts from the right side, and the pipe can be vertically lifted to the upper end of the cutting table and fixed, which makes placement more convenient. At the same time, during cutting, both ends of the cutting position of the pipe are fixed and will not warp. The nuts of the positioning bolts are loosened, and the position of the movable baffle is adjusted. Sparks can be avoided to the greatest extent possible through the movable baffle and the fixed baffle, and safety is guaranteed.

[0013] 2. The fixed-length cutting device for bridge guardrail pipes disclosed in the present application has an output shaft of motor 2 driving the cutting blade to rotate, and motor 3 driving the cutting blade to move left and right. The distance between the cutting blade and the motor cover is detected by distance measuring sensor 1, thereby realizing automatic and precise feeding and cutting of the cutting blade.

[0014] 3. The fixed-length cutting device for bridge guardrail pipes disclosed in the present application has an output shaft of motor 4 that drives the two screw rods 2 to rotate synchronously, driving the baffle to move forward and backward. If the cutting distance of the pipe is short, the baffle can be removed, and the fixed seat can be moved between the two rotating tables at the front end before installation. The relative distance between the rear side surface of the baffle and the cutting blade is the cutting length of the pipe, eliminating the step of repeatedly determining the cutting distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of the fixed-length cutting device for the bridge guardrail pipe in the embodiment; Figure 2 for Figure 1 The enlarged view of the mark A; Figure 3 for Figure 1 An enlarged view of the label B; Figure 4 A cross-sectional view of a fixed-length cutting device for a bridge guardrail pipe in an embodiment; Figure 5 for Figure 4 Enlarged view of the area marked C.

[0016] In the figure: 1-cutting table, 2-support plate, 3-clamping mechanism, 31-motor 1, 32-motor seat, 33-sprocket 1, 34-hydraulic cylinder, 35-sprocket 2, 36-arc plate, 37-positioning wheel, 38-driving wheel, 4-cutting extension table, 5-cutting mechanism, 501-fixed seat 1, 502-cutting blade, 503-motor cover, 504-motor 2, 505-movable baffle, 506-slider, 50 7-fixed baffle, 508-arc groove, 509-positioning bolt, 510-screw rod one, 511-fixed seat two, 512-motor three, 6-distance sensor one, 7-positioning mechanism, 71-motor four, 72-fixed seat three, 73-sprocket two, 74-fixed seat four, 75-fixed seat, 76-baffle, 77-screw rod two, 8-mounting seat, 9-distance sensor two, 10-industrial computer, 11-rotating axis. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-5 The present embodiment provides a bridge guardrail pipe fixed-length cutting device, including a cutting table 1, a clamping mechanism 3, a positioning mechanism 7 and an industrial computer 10, wherein the industrial computer 10 is arranged on one side of the cutting table 1.

[0019] A cutting extension platform 4 is arranged on the right side of the cutting table 1, and a cutting mechanism 5 is arranged on the upper end of the cutting extension platform 4. The cutting mechanism 5 includes a fixed seat 1 501, a cutting blade 502, a motor cover 503, a motor 2 504, a slider 506, a screw rod 1 510, a fixed seat 2 511 and a motor 3 512. The middle part of the upper surface of the cutting table 1 is fixedly connected with the fixed seat 1 501, the upper surface of the cutting extension platform 4 is fixedly connected with the fixed seat 2 511, and the upper surface of the whole composed of the cutting table 1 and the cutting extension platform 4 is fixedly connected with a guide rail, and the guide rail is located between the fixed seat 1 501 and the fixed seat 2 511, and the fixed seat 1 501 and the fixed seat 2 511 are rotatably connected. There is a screw rod 510, and the right side surface of the fixed seat 2 511 is fixedly connected to the motor 3 512, the output shaft of the motor 3 512 is fixedly connected to the right end of the screw rod 1 510, the middle part of the screw rod 1 510 is threadedly connected to the slider 506, the slider 506 is slidably connected to the upper end of the guide rail, the upper end of the slider 506 is fixedly connected to the motor cover 503 and the motor 2 504, the motor 2 504 is located inside the motor cover 503, the rear end of the slider 506 is rotatably connected to the cutting blade 502 through the rotating shaft, the output shaft of the motor 2 504 is fixedly connected to the front end of the rotating shaft, and the signal controlled ends of the motor 2 504 and the motor 3 512 are both connected to the signal control end of the industrial computer 10.

[0020] The cutting mechanism 5 also includes a movable baffle 505, a fixed baffle 507, an arc groove 508 and a positioning bolt 509. The rear end of the slider 506 is fixedly connected to the fixed baffle 507, and the upper end of the fixed baffle 507 is slidably connected to the movable baffle 505. The cutting blade 502 is located inside the fixed baffle 507 and the movable baffle 505. The edge of the upper end of the fixed baffle 507 is provided with an arc groove 508. The positioning bolt 509 passes through the through hole and the arc groove 508 of the movable baffle 505. The front end of the positioning bolt 509 is threadedly connected with a nut. The upper end of the fixed seat 511 is fixedly connected to the distance sensor 16, and the distance sensor 16 is connected to the left and right sides of the motor cover 503. Corresponding to the right position, the signal output end of the distance sensor 6 is electrically connected to the signal receiving end of the industrial computer 10, the output shaft of the motor 2 504 drives the cutting blade 502 to rotate, and the output shaft of the motor 3 512 drives the screw 1 510 to rotate, driving the slider 506 to slide to the left at the upper end of the guide rail, and the motor 2 504 and the motor cover 503 both move to the left. The distance sensor 6 detects the distance with the motor cover 503 and feeds back to the industrial computer 10 to realize the precise control of the feeding distance of the cutting blade 502, loosen the nut of the positioning bolt 509, and adjust the position of the movable baffle 505. The movable baffle 505 and the fixed baffle 507 are used to avoid sparks from flying everywhere to the greatest extent.

[0021] The clamping mechanism 3 includes a hydraulic cylinder 34, an arc plate 36, a positioning wheel 37 and a driving wheel 38. Two evenly distributed rotating tables are provided on the left and right sides of the upper end of the cutting table 1. The interior of the rotating table is rotatably connected to the driving wheels 38 symmetrically distributed on the left and right. The left and right ends of the bottom wall of the cutting table 1 are fixedly connected to the support plate 2. The upper end of the support plate 2 is fixedly connected to the evenly distributed hydraulic cylinder 34. The upper end of the telescopic end of the hydraulic cylinder 34 is rotatably connected to the arc plate 36. The two adjacent arc plates 36 on the left and right are symmetrically distributed. The rotating tables are respectively located between the two adjacent arc plates 36 on the left and right. The upper and lower ends of the arc plate 36 are rotatably connected to the positioning wheels 37. The oil inlet of the hydraulic cylinder 34 is connected to the oil outlet of the external oil pump.

[0022] The clamping mechanism 3 also includes a motor 1 31, a motor seat 32, a sprocket 1 33 and a sprocket 2 35. The bottom wall of the cutting table 1 is fixedly connected with evenly distributed bearing seats. The front end of the bottom wall of the cutting table 1 is fixedly connected with the motor seat 32. The rotating shaft 11 is rotatably connected between the motor seat 32 and each bearing seat. The outer sleeve of the rotating shaft 11 is provided with an evenly distributed sprocket 1 33. The front ends of the four driving wheels 38 at the front end and the rear ends of the four driving wheels 38 at the rear end are provided with sprocket 2 35. The sprocket 1 33 and the two vertically adjacent sprockets 2 35 are connected by a chain 1 transmission. The front end of the bottom wall of the cutting table 1 is fixedly connected with the motor 1 31. The output shaft of the motor 1 31 is fixedly connected to the right end of the rotating shaft 11. The signal controlled end of the motor 1 31 is connected to the signal control end of the industrial computer 10.

[0023] The clamping mechanism 3 also includes a mounting seat 8, which is evenly fixedly connected to the top wall of the cutting table 1. The lower end of the mounting seat 8 is fixedly connected with a distance sensor 9. The distance sensor 9 is respectively located between two adjacent driving wheels 38 at the upper end. The signal output end of the distance sensor 9 is electrically connected to the signal receiving end of the industrial computer 10. The telescopic end of the hydraulic cylinder 34 is pushed out, and the arc plate 36 moves up. After the positioning wheel 37 at the lower end contacts the pipe fitting, the arc plate 36 sends a rotation and continues to rise. The positioning wheel 37 at the upper end approaches the pipe fitting. When the upper end After the positioning wheel 37 contacts the pipe fitting, the arc plate 36 stops rising. When the distance detected by the distance measuring sensor 29 becomes larger, it means that the arc plate 36 has risen excessively and has lifted the pipe fitting. The extension distance of the telescopic end of the hydraulic cylinder 34 is adjusted to make the driving wheel 38 and the two upper and lower positioning wheels 37 keep in contact with the pipeline. During cutting, the output shaft of the motor 1 31 drives the rotating shaft 11 and the sprocket 1 33 to rotate. The sprocket 1 33 drives the two vertically adjacent sprockets 2 35 to rotate through the chain 1, so that all the driving wheels 38 rotate synchronously, driving the pipe fitting to rotate.

[0024] The positioning mechanism 7 is arranged at the front end of the cutting table 1, and the positioning mechanism 7 includes a fixing seat 4 74, a fixing seat 75, a baffle 76 and a screw rod 2 77. The left and right ends of the upper front side of the cutting table 1 are fixedly connected with the fixing seat 4 74 distributed front and rear, and the screw rod 2 77 is rotatably connected between the two fixing seats 4 74 on the same side of the left and right. The outer sides of the screw rod 2 77 are threadedly connected with the fixing seat 75, and the baffle 76 is bolted between the upper ends of the two fixing seats 75. The positioning mechanism 7 includes a motor 4 71, a fixing seat 3 72 and a sprocket 2 73. The front end of the upper front side of the cutting table 1 is fixedly connected with the fixing seat 3 72, and the front end of the screw rod 2 77 is rotatably connected to the middle part of the fixing seat 3 72. The front end of the screw rod 2 77 is fixedly sleeved with a sprocket 2 73. The sprocket 2 73 Both are located between the fixed seat three 72 and the adjacent fixed seat four 74 on the same side. The two sprocket wheels 2 73 are connected through chain 2 transmission. The front side of the fixed seat three 72 on the right is fixedly connected with a motor 4 71. The output shaft of the motor 4 71 is fixedly connected to the front end of the screw rod 2 77 on the right. The signal controlled end of the motor 4 71 is connected to the signal control end of the industrial computer 10. The output shaft of the motor 4 71 drives the sprocket wheel 2 73 and the screw rod 2 77 on the right to rotate. The chain 2 drives the sprocket wheel 2 73 and the screw rod 2 77 on the left to rotate, thereby realizing the synchronous rotation of the two screw rods 2 77. The two fixed seats 75 slide synchronously on the adjacent screw rods 2 77, driving the baffle 76 to move forward and backward. The relative distance between the rear side of the baffle 76 and the cutting blade 502 is the cutting length of the pipe.

[0025] The fixed-length cutting device for bridge guardrail pipes provided by the present invention has the following working principle: The output shaft of the motor 4 71 drives the sprocket 2 73 and the screw rod 2 77 on the right to rotate, and the chain 2 drives the sprocket 2 73 and the screw rod 2 77 on the left to rotate, so as to realize the synchronous rotation of the two screw rods 2 77, and the two fixing seats 75 slide synchronously on the adjacent screw rods 2 77, driving the baffle 76 to move forward and backward. The relative distance between the rear side of the baffle 76 and the cutting blade 502 is the cutting length of the pipe fitting. The pipe fitting to be cut is lifted, and the front end of the pipe fitting is aligned with the rear side of the baffle 76. The pipe fitting is placed between the two adjacent driving parts on the left and right. The distance sensor 29 detects the distance between the pipe and the distance sensor 29 and feeds back to the industrial computer 10 for recording. The telescopic end of the hydraulic cylinder 34 is pushed out, and the arc plate 36 moves up. After the positioning wheel 37 at the lower end contacts the pipe, the arc plate 36 sends a rotation and continues to rise. The positioning wheel 37 at the upper end approaches the pipe. When the positioning wheel 37 at the upper end contacts the pipe, the arc plate 36 stops rising. When the distance detected by the distance sensor 29 becomes larger, it means that the arc plate 36 has risen excessively and has lifted the pipe. The telescopic end of the hydraulic cylinder 34 extends to a distance that allows the driving wheel 38 and the two positioning wheels 37 at the upper and lower ends to keep in contact with the pipe. Then, the output shaft of the motor 2 504 drives the cutting blade 502 to rotate, and the output shaft of the motor 3 512 drives the screw 1 510 to rotate, driving the slider 506 to slide to the left at the upper end of the guide rail. The motor 2 504 and the motor cover 503 both move to the left. The distance measuring sensor 1 6 detects the distance with the motor cover 503 and feeds back to the industrial computer 10, so as to realize the precise control of the feeding distance of the cutting blade 502. Loosen the nut of the positioning bolt 509 and adjust the position of the movable baffle 505. The movable baffle 505 and the fixed baffle 507 are used to prevent sparks from flying around to the greatest extent. During cutting, the output shaft of the motor 31 drives the rotating shaft 11 and the sprocket 33 to rotate. The sprocket 33 drives the two vertically adjacent sprockets 2 35 to rotate through the chain 1, so that all the driving wheels 38 rotate synchronously, driving the pipe fittings to rotate and realizing pipe cutting. During cutting, the arc plate 36 near the cutting position fixes the pipe fittings to prevent the pipe fittings from tilting.

[0026] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fixed-length cutting device for bridge guardrail pipe fittings, characterized in that: It comprises a cutting table (1), a clamping mechanism (3) and a positioning mechanism (7); A cutting extension platform (4) is arranged on the right side of the cutting platform (1), and a cutting mechanism (5) is arranged on the upper end of the cutting extension platform (4); The clamping mechanism (3) comprises a hydraulic cylinder (34), an arc plate (36), a positioning wheel (37) and a driving wheel (38); two evenly distributed rotating tables are provided on the left and right sides of the upper end of the cutting table (1); the interior of the rotating tables is rotatably connected to driving wheels (38) symmetrically distributed on the left and right sides; the left and right ends of the bottom wall of the cutting table (1) are fixedly connected to support plates (2); the upper ends of the support plates (2) are fixedly connected to evenly distributed hydraulic cylinders (34); the upper ends of the telescopic ends of the hydraulic cylinders (34) are rotatably connected to the arc plates (36); the two adjacent arc plates (36) on the left and right sides are symmetrically distributed; the rotating tables are respectively located between the two adjacent arc plates (36) on the left and right sides; the upper and lower ends of the arc plates (36) are rotatably connected to positioning wheels (37); and the oil inlets of the hydraulic cylinders (34) are connected to the oil outlets of the external oil pumps; The positioning mechanism (7) is arranged at the front end of the cutting table (1).

2. The device for cutting to length a bridge guardrail pipe according to claim 1 is characterized in that: The clamping mechanism (3) further comprises a motor 1 (31), a motor seat (32), a sprocket 1 (33) and a sprocket 2 (35); the bottom wall of the cutting table (1) is fixedly connected to evenly distributed bearing seats; the front end of the bottom wall of the cutting table (1) is fixedly connected to the motor seat (32); a rotating shaft (11) is rotatably connected between the motor seat (32) and each bearing seat; an outer sleeve of the rotating shaft (11) is provided with evenly distributed sprocket 1 (33); the front ends of the four driving wheels (38) at the front end and the rear ends of the four driving wheels (38) at the rear end are provided with sprocket 2 (35); the sprocket 1 (33) and two vertically adjacent sprockets 2 (35) are connected in transmission via a chain 1; the front end of the bottom wall of the cutting table (1) is fixedly connected to the motor 1 (31); and the output shaft of the motor 1 (31) is fixedly connected to the right end of the rotating shaft (11).

3. The device for cutting to length a bridge guardrail pipe according to claim 1, characterized in that: The positioning mechanism (7) comprises a fixing seat four (74), a fixing seat (75), a baffle (76) and a screw rod two (77); the left and right ends of the front side of the upper end of the cutting table (1) are fixedly connected to the fixing seats four (74) distributed front and rear; the screw rod two (77) is rotatably connected between the two fixing seats four (74) on the same side of the left and right sides; the outer sides of the screw rod two (77) are threadedly connected to the fixing seat (75); and the baffle (76) is connected between the upper ends of the two fixing seats (75) by bolts.

4. The device for cutting to length a bridge guardrail pipe according to claim 3 is characterized in that: The positioning mechanism (7) comprises a motor four (71), a fixing seat three (72) and a sprocket two (73); the front end of the upper front side of the cutting table (1) is fixedly connected to the fixing seat three (72); the front end of the screw rod two (77) is rotatably connected to the middle part of the fixing seat three (72); the front end of the screw rod two (77) is fixedly sleeved with a sprocket two (73); the sprocket two (73) is located between the fixing seat three (72) and the adjacent fixing seat four (74) on the same side; the two sprocket twos (73) are connected by a chain two transmission; the front side of the fixing seat three (72) on the right side is fixedly connected to the motor four (71); the output shaft of the motor four (71) is fixedly connected to the front end of the screw rod two (77) on the right side.

5. The device for cutting to length a bridge guardrail pipe according to claim 1, characterized in that: The cutting mechanism (5) comprises a fixing seat 1 (501), a cutting blade (502), a motor cover (503), a motor 2 (504), a slider (506), a screw rod 1 (510), a fixing seat 2 (511) and a motor 3 (512); the fixing seat 1 (501) is fixedly connected to the middle of the upper surface of the cutting table (1); the fixing seat 2 (511) is fixedly connected to the upper surface of the cutting extension table (4); the upper surface of the whole consisting of the cutting table (1) and the cutting extension table (4) is fixedly connected to a guide rail, the guide rail is located between the fixing seat 1 (501) and the fixing seat 2 (511); A screw rod (510) is rotatably connected to the guide rail, a motor (512) is fixedly connected to the right side of the fixed seat (511), an output shaft of the motor (512) is fixedly connected to the right end of the screw rod (510), a slider (506) is threadedly connected to the middle of the screw rod (510), the slider (506) is slidably connected to the upper end of the guide rail, the upper end of the slider (506) is fixedly connected to the motor cover (503) and the motor (504), the motor (504) is located inside the motor cover (503), the rear end of the slider (506) is rotatably connected to the cutting blade (502) via a rotating shaft, and the output shaft of the motor (504) is fixedly connected to the front end of the rotating shaft.

6. The device for cutting to length a bridge guardrail pipe according to claim 5, characterized in that: The cutting mechanism (5) further comprises a movable baffle (505), a fixed baffle (507), an arc-shaped groove (508) and a positioning bolt (509); the rear end of the slider (506) is fixedly connected to the fixed baffle (507); the upper end of the fixed baffle (507) is slidably connected to the movable baffle (505); the cutting blade (502) is located inside the fixed baffle (507) and the movable baffle (505); the upper end edge of the fixed baffle (507) is provided with an arc-shaped groove (508); the positioning bolt (509) passes through the through hole of the movable baffle (505) and the arc-shaped groove (508); and the front end of the positioning bolt (509) is threadedly connected to a nut.

7. The device for cutting to length a bridge guardrail pipe according to claim 5, characterized in that: The upper end of the second fixing seat (511) is fixedly connected to a distance measuring sensor (6), and the distance measuring sensor (6) corresponds to the left and right positions of the motor cover (503).

8. The device for cutting to length a bridge guardrail pipe according to claim 1, characterized in that: It also includes a mounting seat (8), the mounting seat (8) being evenly fixedly connected to the top wall of the cutting table (1), the lower end of the mounting seat (8) being fixedly connected to a second distance measuring sensor (9), the second distance measuring sensor (9) being respectively located between two adjacent driving wheels (38) at the upper end.

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