A plasma cutting machine for bridge steel

Abstract

The present invention discloses a plasma cutting machine for bridge steel, which includes a support component and a second cutting mechanism. There is a feeding and discharging component assembled by bolts on the top side of the support component, and a first cutting mechanism assembled by bolts is arranged above the outer side of the support component, and a second cutting mechanism is arranged on the top side of the first cutting mechanism. The device of the invention mainly utilizes the power output by the second motor to drive the pulley group connected to the output end of the second motor to operate, so that the pulley group drives a plurality of parallelly distributed rotating shafts and rotating roller rods to operate in the same direction, and the rotating roller rods drive the steel to run to a suitable position. Through the first cutting mechanism and the two second cutting mechanisms arranged above the first cutting mechanism, since there are three plasma nozzles, and the adjustment directions of the plasma nozzles arranged on the two second cutting mechanisms are multi-directional, the bridge steel can be efficiently cut, and the equipment will not be damaged while achieving efficient processing.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge steel processing, and in particular to a plasma cutting machine for bridge steel. Background Technique

[0002] A plasma arc cutting machine is a machine that processes metal materials by means of plasma cutting technology. Plasma cutting is a processing method that uses the heat of a high-temperature plasma arc to melt part or locally melt the metal at the workpiece cutting edge, and discharges the molten metal by the momentum of the high-speed plasma to form a cutting edge. The plasma cutting machine can cut various metals that are difficult to cut by oxygen cutting with different working gases, especially for non-ferrous metals, the cutting effect is better.

[0003] When the existing plasma cutting machine is in use, generally, the heat of a high-temperature plasma arc is used to melt part or locally melt the metal at the workpiece cutting edge, and the molten metal is discharged by the momentum of the high-speed plasma to form a cutting edge. For example, the plasma cutting machine for steel cutting with the application number CN202022145201.4 belongs to the technical field of cutting equipment. The plasma cutting machine for steel cutting includes a working plate, a second sliding column is fixedly installed above the threaded rod, and a plasma cutting head is movably installed inside the second moving block; however, in the above technology, only a set of cutting knives with fewer adjustment directions is used to cut the steel on the loading table. However, the joint between the loading table and the steel is easily damaged by the plasma cutting head. For this reason, we propose a plasma cutting machine for bridge steel to solve the above problems. Summary of the Invention

[0004] In view of the above problems, the present invention proposes a plasma cutting machine for bridge steel. The plasma cutting machine for bridge steel mainly uses the power output of the second motor to drive the pulley group connected to the output end of the second motor to operate, so that the pulley group drives a plurality of parallel distributed rotating shafts and rotating rollers to operate in the same direction, and the rotating rollers drive the steel to run to a suitable position. Through the first cutting mechanism and two second cutting mechanisms arranged above the first cutting mechanism, since there are three plasma nozzles, and the adjustment directions of the plasma nozzles arranged on the two second cutting mechanisms are multi-directional, the bridge steel can be cut efficiently, and the equipment will not be damaged while efficient processing.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A plasma cutting machine for bridge steel includes a support component and a second cutting mechanism. There is a feeding and discharging component assembled by bolts on the top side of the support component. A first cutting mechanism assembled by bolts is arranged above the outer side of the support component, and a second cutting mechanism is arranged on the top side of the first cutting mechanism;

[0007] The support member includes a cushion block, a thick-bottom backing plate, a bolt base block, a lifting frame and an inclined plate. A thick-bottom backing plate is arranged on the top of the cushion block, and a lifting frame is bolted above one end of the thick-bottom backing plate through the bolt base block. An inclined plate is arranged on the top side of the lifting frame;

[0008] The feeding and discharging assembly includes a bolt base, a side shaft plate, a cover plate, a motor base, a first motor, a transmission rod, a first gear, a driven gear, a threaded groove, a threaded bar, an adjusting plate, an upper connecting plate, a bearing sleeve, a pulley group, a second motor, a rotating shaft and a rotating roller bar. The side shaft plate is bolted to the top side of the thick-bottom backing plate through the bolt base. A cover plate is arranged on the top side of the side shaft plate. A motor base for installing the first motor is arranged inside one end of the side shaft plate. The output end of the first motor penetrates through the motor base and is connected to a transmission rod with a first gear installed thereon. The first gear is meshed and connected with a driven gear. The output end of the driven gear is connected to a threaded groove which is connected to the side shaft plate through a bearing, and the threaded groove is threadedly connected with a threaded bar. One end of the threaded bar is connected to the adjusting plate through a bearing, and an upper connecting plate connected by bolts is arranged above the inner side of the adjusting plate;

[0009] The first cutting mechanism includes a side support plate, a side rod, an inner groove box, an electric screw rod, a slider, a lifting cylinder, a first electric rotary seat, a first connecting rod, a first assembly seat and a lower plasma spray nozzle. The side rod is bolted to the outer side above of the thick-bottom backing plate through the side support plate. An inner groove box assembled by bolts is arranged on the inner side of the side rod, and a slider is threadedly connected to the inner groove box through the electric screw rod.

[0010] As a further technical solution, a bearing sleeve is arranged on the inner side of the upper connecting plate. The input end of the bearing sleeve is connected to the output end of the pulley group. The input end of the pulley group is connected to the output end of the second motor. The output end of the bearing sleeve is connected to a rotating shaft with a rotating roller bar installed thereon.

[0011] As a further technical solution, a lifting cylinder is arranged above the slider, and a first electric rotary seat is arranged at the top end of the lifting cylinder. A first connecting rod is arranged above the first electric rotary seat, and a lower plasma spray nozzle is bolted and sleeved at one end of the first connecting rod through the first assembly seat.

[0012] As a further technical solution, the second cutting mechanism includes an upper groove box, a gear box, a driving motor, a gear set, a lifting lead screw, a lifting block, a pneumatic telescopic rod, a second electric rotating seat, an electric swing arm, an electric hinge seat, a second connecting rod, a second mounting seat and an upper-side plasma spray. The upper groove box is arranged on the top side of the side rod. A gear box for installing the driving motor is arranged on the top of the upper groove box. The output end of the driving motor penetrates through the gear box and is connected with the gear set. The output end of the gear set penetrates through the gear box and is connected with a lifting lead screw in the upper groove box. The lifting lead screw is in threaded connection with the lifting block.

[0013] As a further technical solution, a pneumatic telescopic rod is arranged on the inner side of the lifting block. One end of the pneumatic telescopic rod is connected with an electric swing arm through the output end of the second electric rotating seat. One end of the electric swing arm is connected with a second connecting rod through the output end of the electric hinge seat. One end of the second connecting rod is bolt-sleeved with an upper-side plasma spray through the second mounting seat.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] The device of the invention mainly uses the power output by the second motor to drive the pulley group connected to the output end of the second motor to operate, so that the pulley group drives a plurality of parallel-distributed rotating shafts and rotating rollers to operate in the same direction, and the rotating rollers drive the steel to run to a suitable position. Through the first cutting mechanism and the two second cutting mechanisms arranged above the first cutting mechanism, since there are three plasma spray nozzles, and the adjustment directions of the plasma spray nozzles arranged on the two second cutting mechanisms are multi-directional, the bridge steel can be efficiently cut, and the equipment will not be damaged during efficient processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a plasma cutting machine for bridge steel;

[0017] Figure 2 It is a structural schematic diagram of the feeding and discharging assembly and the first driving mechanism in the present invention;

[0018] Figure 3 It is a structural schematic diagram of the transmission rod and the first gear in the present invention;

[0019] Figure 4 It is a structural schematic diagram of the first cutting mechanism in the present invention;

[0020] Figure 5 It is a structural schematic diagram of the driving motor and the gear set in the present invention;

[0021] Figure 6 It is a structural schematic diagram of the second mounting seat and the upper-side plasma spray in the present invention.

[0022] In the figure: 1, support component; 101, spacer block; 102, thick bottom backing plate; 103, bolt base block; 104, lifting frame; 105, inclined plate; 2, feeding and discharging component; 201, bolt base; 202, side shaft plate; 203, cover plate; 204, motor base; 205, first motor; 206, transmission rod; 207, first gear; 208, driven gear; 209, thread groove; 2010, thread bar; 2011, adjusting plate; 2012, upper connecting plate; 2013, bearing sleeve; 2014, pulley set; 2015, second motor; 2016, rotating shaft; 2017, rotating roller bar; 3, first cutting mechanism; 301, side supporting plate; 302, side rod; 303, inner groove box; 304, electric lead screw; 305, slider; 306, lifting cylinder; 307, first electric rotating seat; 308, first connecting rod; 309, first assembly seat; 3010, lower plasma nozzle; 4, second cutting mechanism; 401, upper groove box; 402, gear box; 403, driving motor; 404, gear set; 405, lifting lead screw; 406, lifting block; 407, pneumatic telescopic rod; 408, second electric rotating seat; 409, electric swing arm; 4010, electric hinge seat; 4011, second connecting rod; 4012, second assembly seat; 4013, upper side plasma spray. Detailed implementation manners

[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0024] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figures 1-6 , in the embodiment of the present invention, a plasma cutting machine for bridge steel includes a support member 1 and a second cutting mechanism 4. There is a bolt-assembled feeding and discharging assembly 2 on the top side of the support member 1, and a bolt-assembled first cutting mechanism 3 is arranged above the outer side of the support member 1, and a second cutting mechanism 4 is arranged on the top side of the first cutting mechanism 3.

[0027] The support member 1 includes a cushion block 101, a thick bottom cushion plate 102, a bolt base block 103, a lifting frame 104, and an inclined plate 105. The thick bottom cushion plate 102 is arranged on the top of the cushion block 101, and a lifting frame 104 is bolted above one end of the thick bottom cushion plate 102 through the bolt base block 103, and an inclined plate 105 is arranged on the top side of the lifting frame 104.

[0028] In the embodiment of the present invention, the cut steel is driven by the rotation of the rotating roller 2017 to the inclined plate 105 above the lifting frame 104, and through the action of the inclined plane, the output device is used to complete the final processing.

[0029] The feeding and discharging assembly 2 includes a bolt base 201, side shaft plates 202, cover plates 203, motor bases 204, first motors 205, transmission rods 206, first gears 207, driven gears 208, threaded grooves 209, threaded bars 2010, adjusting plates 2011, upper connecting plates 2012, bearing sleeves 2013, pulley sets 2014, second motors 2015, rotating shafts 2016 and rotating roller rods 2017. The side shaft plates 202 are bolted to the top side of the thick bottom backing plate 102 through the bolt base 201. Cover plates 203 are arranged on the top side of the side shaft plates 202. Motor bases 204 for installing the first motors 205 are arranged inside one end of the side shaft plates 202. The output end of the first motor 205 passes through the motor base 204 and is connected to a transmission rod 206 on which a first gear 207 is installed. The first gear 207 is meshed and connected to a driven gear 208.

[0030] In an embodiment of the present invention, during use, the first motor 205 on one side of the motor base 204 is started to output power to drive the output end of the first motor 205 to operate, so that the output end of the first motor 205 drives the transmission rod 206 to rotate, and the driven gear 208 is driven to perform meshing transmission through the rotation of the transmission rod 206.

[0031] The output end of the driven gear 208 is connected to a threaded groove 209 that is bearing-connected to the side shaft plate 202, and the threaded groove 209 is threadedly connected to a threaded bar 2010. One end of the threaded bar 2010 is bearing-connected to an adjusting plate 2011, and an upper connecting plate 2012 connected by bolts is arranged above the inner side of the adjusting plate 2011.

[0032] In an embodiment of the present invention, when the driven gear 208 performs meshing transmission, the threaded groove 209 on the inner side of the side shaft plate 202 is driven to rotate through the output end of the driven gear 208, so that the threaded groove 209 spirally drives the threaded bar 2010 to adjust the distance between the side shaft plate 202 and the adjusting plate 2011 so that the distance conforms to the size of the steel.

[0033] Bearing sleeves 2013 are arranged on the inner side of the upper connecting plate 2012. The input end of the bearing sleeve 2013 is connected to the output end of a pulley set 2014, the input end of the pulley set 2014 is connected to the output end of a second motor 2015, and the output end of the bearing sleeve 2013 is connected to a rotating shaft 2016 on which a rotating roller rod 2017 is installed.

[0034] In an embodiment of the present invention, the second motor 2015 is then started to output power to drive the output end of the second motor 2015 to operate, so that the output end of the second motor 2015 drives the pulley group 2014 to rotate in the same direction. In this way, the output end of the pulley group 2014 drives the rotating shaft 2016 arranged on the inner side of the bearing sleeve 2013 to operate in the same direction, and the rotating shaft 2016 drives a plurality of parallelly distributed rotating rollers 2017 to operate in the same direction, so that the steel runs to the processing ends of the first cutting mechanism 3 and the second cutting mechanism 4 under the rolling operation of the rotating rollers 2017.

[0035] The first cutting mechanism 3 includes a side support plate 301, a side rod 302, an inner groove box 303, an electric lead screw 304, a slider 305, a lifting cylinder 306, a first electric rotating seat 307, a first connecting rod 308, a first mounting seat 309 and a lower plasma nozzle 3010. The side rod 302 is bolted to the upper outer side of the thick bottom cushion plate 102 through the side support plate 301. An inner groove box 303 bolted is arranged on the inner side of the side rod 302, and a slider 305 is threadedly connected to the inner groove box 303 through the electric lead screw 304.

[0036] In an embodiment of the present invention, when it is necessary to cut the lower part of the steel, the motor arranged on the inner side of the inner groove box 303 is used to drive the electric lead screw 304 to rotate, so that the rotation of the electric lead screw 304 drives the slider 305 to run to the real-time cutting position.

[0037] A lifting cylinder 306 is arranged above the slider 305, and a first electric rotating seat 307 is arranged at the top end of the lifting cylinder 306. A first connecting rod 308 is arranged above the first electric rotating seat 307, and one end of the first connecting rod 308 is bolted with the lower plasma nozzle 3010 through the first mounting seat 309.

[0038] In an embodiment of the present invention, after the slider 305 runs to the real-time cutting position, the output end of the lifting cylinder 306 is started to output power to drive the first electric rotating seat 307 to run to a suitable cutting height. Then, the output end of the first electric rotating seat 307 outputs power to drive the first connecting rod 308 connected to the output end of the first electric rotating seat 307 to rotate to a real-time angular position suitable for cutting, so that the lower plasma nozzle 3010 bolted to one end of the first connecting rod 308 through the first mounting seat 309 effectively cuts the steel on the rotating roller 2017.

[0039] The second cutting mechanism 4 includes an upper groove box 401, a gear box 402, a driving motor 403, a gear set 404, a lifting lead screw 405, a lifting block 406, a pneumatic telescopic rod 407, a second electric rotating seat 408, an electric swing arm 409, an electric hinge seat 4010, a second connecting rod 4011, a second mounting seat 4012, and an upper-side plasma spray 4013. The upper groove box 401 is arranged on the top side of the side rod 302. A gear box 402 for installing the driving motor 403 is arranged on the top of the upper groove box 401. The output end of the driving motor 403 penetrates through the gear box 402 and is connected with a gear set 404. The output end of the gear set 404 penetrates through the gear box 402 and is connected with a lifting lead screw 405 in the upper groove box 401, and the lifting lead screw 405 is in threaded connection with a lifting block 406.

[0040] In an embodiment of the present invention, when it is necessary to cut the upper part of the steel, start the driving motor 403 to output power to drive the operation of the output end of the driving motor 403, so that the output end of the driving motor 403 drives the gear set 404 in the gear box 402 to engage and transmit. After the gear set 404 engages and transmits, it drives the lifting lead screw 405 inside the upper groove box 401 to drive and operate, so that the lifting block 406 in threaded connection with the lifting lead screw 405 is adjusted to the real-time height suitable for cutting.

[0041] A pneumatic telescopic rod 407 is arranged on the inner side of the lifting block 406. One end of the pneumatic telescopic rod 407 is connected with an electric swing arm 409 through the output end of a second electric rotating seat 408. One end of the electric swing arm 409 is connected with a second connecting rod 4011 through the output end of an electric hinge seat 4010, and one end of the second connecting rod 4011 is bolt-sleeved with an upper-side plasma spray 4013 through a second mounting seat 4012 on the inner side.

[0042] In an embodiment of the present invention, when the lifting block 406 runs to the real-time height suitable for cutting, start the pneumatic telescopic rod 407 to output power to drive the second electric rotating seat 408 to run to the real-time axial position suitable for cutting. Then start the second electric rotating seat 408 to output power to drive the electric swing arm 409 connected to the output end of the second electric rotating seat 408 to be adjusted to the real-time angle suitable for cutting. The electric hinge seat 4010 arranged at one end of the electric swing arm 409 outputs power to drive the second connecting rod 4011 to run to the real-time angle orientation suitable for cutting, so that the upper-side plasma spray 4013 bolt-sleeved by the second mounting seat 4012 on the inner side of one end of the second connecting rod 4011 effectively cuts the steel on the rotating roller 2017.

[0043] The working principle of the present invention is as follows: When in use, the first motor 205 on one side of the motor base 204 is started to output power to drive the output end of the first motor 205 to operate, so that the output end of the first motor 205 drives the transmission rod 206 to rotate. The rotation of the transmission rod 206 drives the driven gear 208 to engage and transmit power. When the driven gear 208 engages and transmits power, the output end of the driven gear 208 drives the threaded groove 209 on the inner side of the side shaft plate 202 to rotate, so that the threaded groove 209 spirally drives the threaded bar 2010 to adjust the distance between the side shaft plate 202 and the adjusting plate 2011, making the distance conform to the size of the steel. Then, the second motor 2015 is started to output power to drive the output end of the second motor 2015 to operate, so that the output end of the second motor 2015 drives the pulley group 2014 to rotate in the same direction. In this way, the output end of the pulley group 2014 drives the rotating shaft 2016 arranged on the inner side of the bearing sleeve 2013 to operate in the same direction, and the rotating shaft 2016 drives a plurality of parallel distributed rotating roller rods 2017 to operate in the same direction, so that the steel runs to the processing ends of the first cutting mechanism 3 and the second cutting mechanism 4 under the rolling of the rotating roller rods 2017. When it is necessary to cut the lower part of the steel, the motor arranged on the inner side of the inner groove box 303 is used to drive the electric lead screw 304 to rotate, so that the rotation of the electric lead screw 304 drives the slider 305 to run to the real-time cutting position. After the slider 305 runs to the real-time cutting position, the output end of the lifting air cylinder 306 is started to output power to drive the first electric rotating seat 307 to run to a suitable cutting height. Then, the output end of the first electric rotating seat 307 outputs power to drive the first connecting rod 308 connected to the output end of the first electric rotating seat 307 to rotate to a suitable real-time cutting angle position, so that the lower plasma nozzle 3010 bolted to one end of the first connecting rod 308 through the first assembly seat 309 effectively cuts the steel on the rotating roller rod 2017. When it is necessary to cut the upper part of the steel, the drive motor 403 is started to output power to drive the output end of the drive motor 403 to operate, so that the output end of the drive motor 403 drives the gear set 404 in the gear box 402 to engage and transmit power. After the gear set 404 engages and transmits power, the lifting lead screw 405 inside the upper groove box 401 is driven to operate, so that the lifting block 406 threadedly connected to the lifting lead screw 405 is adjusted to a suitable real-time cutting height. After the lifting block 406 runs to the suitable real-time cutting height, the output end of the pneumatic telescopic rod 407 is started to output power to drive the second electric rotating seat 408 to run to a suitable real-time axial position for cutting. Then, the second electric rotating seat 408 is started to output power to drive the electric swing arm 409 connected to the output end of the second electric rotating seat 408 to be adjusted to a suitable real-time cutting angle. The electric hinge seat 4010 arranged at one end of the electric swing arm 409 outputs power to drive the second connecting rod 4011 to run to a suitable real-time cutting angle orientation.The inner side of one end of the second connecting rod 4011 is sleeved with the upper side plasma spray 4013 bolted through the second assembly seat 4012 to effectively cut the steel on the rotating roller 2017. The cut steel is driven by the operation of the rotating roller 2017 to the inclined plate 105 above the lifting frame 104, and through the action of the inclined surface, an output device is used to complete the final processing.

[0044] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0045] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A plasma cutting machine for bridge steel, comprising a support member (1) and a second cutting mechanism (4), characterized in that: On the top side of the support member (1), there is a bolt-assembled feeding and discharging assembly (2). Above the outer side of the support member (1), there is a bolt-assembled first cutting mechanism (3), and on the top side of the first cutting mechanism (3), there is a second cutting mechanism (4). The support member (1) includes a cushion block (101), a thick-bottom backing plate (102), a bolt base block (103), a lifting frame (104), and an inclined plate (105). On the top of the cushion block (101), there is a thick-bottom backing plate (102). Above one end of the thick-bottom backing plate (102), there is a lifting frame (104) bolted through a bolt base block (103). On the top side of the lifting frame (104), there is an inclined plate (105). The feeding and discharging assembly (2) includes a bolt base (201), side shaft plates (202), a cover plate (203), a motor base (204), a first motor (205), a transmission rod (206), a first gear (207), a driven gear (208), a threaded groove (209), a threaded bar (2010), an adjusting plate (2011), an upper connecting plate (2012), a bearing sleeve (2013), a pulley group (2014), a second motor (2015), a rotating shaft (2016), and a rotating roller bar (2017). The side shaft plates (202) are bolted to the top of the thick-bottom backing plate (102) through the bolt base (201). On the top of the side shaft plates (202), there is a cover plate (203). Inside one end of the side shaft plates (202), there is a motor base (204) for installing the first motor (205). The output end of the first motor (205) passes through the motor base (204) and is connected to a transmission rod (206) with a first gear (207) installed. The first gear (207) is meshed with a driven gear (208). The output end of the driven gear (208) is connected to a threaded groove (209) bearing-connected to the side shaft plates (202). The threaded groove (209) is threadedly connected to a threaded bar (2010). One end of the threaded bar (2010) is bearing-connected to an adjusting plate (2011), and above the inner side of the adjusting plate (2011), there is an upper connecting plate (2012) bolted. The first cutting mechanism (3) includes a side support plate (301), side rods (302), an inner groove box (303), an electric lead screw (304), a slider (305), a lifting cylinder (306), a first electric rotating seat (307), a first connecting rod (308), a first mounting seat (309), and a lower plasma nozzle (3010). The side rods (302) are bolted to the outer side above the thick-bottom backing plate (102) through the side support plate (301). Inside the side rods (302), there is an inner groove box (303) bolted, and on the inner groove box (303), there is a slider (305) threadedly connected through an electric lead screw (304).

2. The plasma cutting machine for bridge steel according to claim 1, characterized in that: On the inner side of the upper connecting plate (2012), a bearing sleeve (2013) is provided. The input end of the bearing sleeve (2013) is connected to the output end of a pulley group (2014), and the input end of the pulley group (2014) is connected to the output end of a second motor (2015). The output end of the bearing sleeve (2013) is connected to a rotating shaft (2016) for installing a rotating roller bar (2017).

3. The plasma cutting machine for bridge steel according to claim 1, characterized in that: Above the slider (305), a lifting cylinder (306) is provided. At the top of the lifting cylinder (306), a first electric rotating seat (307) is provided. Above the first electric rotating seat (307), a first connecting rod (308) is provided. One end of the first connecting rod (308) is bolt-sleeved with a lower plasma spray nozzle (3010) through a first assembly seat (309).

4. The plasma cutting machine for bridge steel according to claim 1, characterized in that: The second cutting mechanism (4) includes an upper groove box (401), a gear box (402), a driving motor (403), a gear set (404), a lifting lead screw (405), a lifting block (406), a pneumatic telescopic rod (407), a second electric rotating seat (408), an electric swing arm (409), an electric hinge seat (4010), a second connecting rod (4011), a second assembly seat (4012), and an upper plasma spray (4013). The upper groove box (401) is arranged on the top side of the side rod (302). On the top of the upper groove box (401), a gear box (402) for installing the driving motor (403) is provided. The output end of the driving motor (403) penetrates through the gear box (402) and is connected to a gear set (404). The output end of the gear set (404) penetrates through the gear box (402) and is connected to a lifting lead screw (405) of the upper groove box (401). The lifting lead screw (405) is threadedly connected to a lifting block (406).

5. The plasma cutting machine for bridge steel according to claim 4, characterized in that: On the inner side of the lifting block (406), a pneumatic telescopic rod (407) is provided. One end of the pneumatic telescopic rod (407) is connected to an electric swing arm (409) through the output end of a second electric rotating seat (408). One end of the electric swing arm (409) is connected to a second connecting rod (4011) through the output end of an electric hinge seat (4010). One end inside of the second connecting rod (4011) is bolt-sleeved with an upper plasma spray (4013) through a second assembly seat (4012).

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