Industrial pure iron medium plate cutting device and method

Abstract

The present application relates to a kind of industrial pure iron medium plate fixed-length cutting device and method, belong to the technical field of deep processing equipment and method of metallurgical industry industrial pure iron production.It is the technical scheme of the present application: hydraulic system includes medium pressure system and low pressure system, medium pressure system connects hydraulic cylinder (13), drives hydraulic cylinder (13) to move, low pressure system connects hydraulic cylinder (13), adjusts the starting position of hydraulic cylinder (13);Displacement sensor one (24) is set in the tail of hydraulic cylinder (13), displacement sensor two (32) is set in the top of shearing hydraulic cylinder (30), laser range finder (20) and camera (33) are set in the position after cutting of hydraulic gantry shear (17).The beneficial effects of the present application are: by adopting the hydraulic unit with medium pressure system and low pressure system to control cutting unit, while applying displacement sensor, laser range finder and camera to monitor cutting state, realize accurate positioning, carry out one-key fixed-length automatic cutting, deep processing of pure iron medium plate according to the size of customer demand, improve cutting efficiency.

Description

Technical Field

[0001] This invention relates to a device and method for cutting medium-thick plates of industrial pure iron to length, belonging to the technical field of deep processing equipment and methods for the production of industrial pure iron in the metallurgical industry. Background Technology

[0002] Industrial pure iron is a filler material. The production process typically involves converter refining followed by rolling into medium-thick plates (50-70mm thick) on a hot-rolled coil production line using a roughing mill. These plates are then flame-cut and cut to length using hydraulic shears, commonly producing 70*70mm or 50*50mm square billets, or other sizes required by the customer, for further processing. Traditional gantry shears typically use mechanical baffles for length cutting. However, for processes with large cutting volumes and heavy billet weights, these baffles are easily damaged, leading to unsustainable production and very low efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a device and method for cutting medium-thick plates of pure iron to length. By using a hydraulic unit that combines medium-pressure and low-pressure systems to control the shearing unit, and by using displacement sensors, laser rangefinders and cameras to monitor the shearing status, precise positioning is achieved, enabling one-click automated cutting to length. The medium-thick plates of pure iron can be further processed according to the dimensions required by the customer, improving cutting efficiency and effectively solving the above-mentioned problems existing in the background technology.

[0004] The technical solution of the present invention is: a fixed-length cutting device for medium and thick plates of industrial pure iron, comprising a hydraulic unit, a shearing unit and a control unit. The shearing unit includes a hydraulic gantry shear, guide wheels, a support platform and a shearing hydraulic cylinder. The shearing hydraulic cylinder is set on the top of the hydraulic gantry shear, the support platform is set on the feeding end of the hydraulic gantry shear, and there are four guide wheels set on the support platform. The line connecting two guide wheels (15) on the same side is perpendicular to the shearing blade of the hydraulic gantry shear.

[0005] The hydraulic unit includes hydraulic cylinders and a hydraulic system. There are two hydraulic cylinders, which are located at the rear of the support platform. The head of the hydraulic cylinder is equipped with a top head, which contacts the pure iron medium-thick plate. The hydraulic system includes a medium-pressure system and a low-pressure system. The medium-pressure system and the low-pressure system share an oil tank. The medium-pressure system is connected to the hydraulic cylinder and drives the hydraulic cylinder to move. The low-pressure system is connected to the hydraulic cylinder and adjusts the starting position of the hydraulic cylinder.

[0006] The control unit includes a laser rangefinder, displacement sensor one, an electrical control cabinet, an industrial computer, a PLC, displacement sensor two, and a camera. Displacement sensor one is located at the tail of the hydraulic cylinder, displacement sensor two is located at the top of the shearing hydraulic cylinder, and the laser rangefinder and camera are located at the rear of the hydraulic gantry shear. The industrial computer and PLC are located inside the electrical control cabinet, and the laser rangefinder, displacement sensor one, displacement sensor two, and camera are connected to the PLC respectively.

[0007] The low-pressure system of the hydraulic unit includes a low-pressure constant-pressure variable pump, a three-position four-way directional valve I, a relief valve III, a check valve II, and a three-position four-way directional valve III. The low-pressure constant-pressure variable pump is connected to two hydraulic cylinders through the three-position four-way directional valve I and the three-position four-way directional valve III, respectively. The relief valve III and the check valve II are located between the low-pressure constant-pressure variable pump and the three-position four-way directional valve I and the three-position four-way directional valve III.

[0008] The medium-pressure system of the hydraulic unit includes a medium-pressure constant-pressure variable pump, a hydraulic synchronous motor, a relief valve, a one-way throttle valve, a relief valve, a one-way valve, a three-position four-way directional valve, and a one-way throttle valve. The medium-pressure constant-pressure variable pump is connected to the hydraulic cylinder through the three-position four-way directional valve. The hydraulic synchronous motor, one-way throttle valve, relief valve, one-way valve, and one-way throttle valve are installed between the three-position four-way directional valve and the two hydraulic cylinders. The relief valve is located at the front end of the three-position four-way directional valve, and the relief valve is located at the front end of the hydraulic cylinder.

[0009] The hydraulic unit also includes a support wheel and a hydraulic cylinder support. The support wheel is located at the lower part of the top head, and the hydraulic cylinder support is located at the lower part of the hydraulic cylinder.

[0010] The shearing unit also includes a slide, a collection trough, and a sliding rail. The sliding rail is set on the support platform, and the collection trough is set at the discharge end of the hydraulic gantry shear. The slide connects the shearing unit to the discharge end of the hydraulic gantry shear and the collection trough.

[0011] It also includes a support beam on which the laser rangefinder and camera are mounted, the height of which matches the position of the laser rangefinder with that of the hydraulic gantry shear.

[0012] A method for cutting industrial pure iron medium-thick plates to length includes the following steps: (1) After the pure iron medium-thick plate is hot rolled offline, it is cut off by a rough length flame cutting process and then transported to the deep processing shearing area. The pure iron medium-thick plate is selected to have one long side close to any guide wheel; (2) The PLC first enters the input terminal of the displacement sensor 1 to the initial 0 point calibration state. The low-pressure system sends low-pressure oil to the two hydraulic cylinders through the three-position four-way directional valve 1 and the three-position four-way directional valve 3 respectively. The starting position of each hydraulic cylinder is adjusted, and the O point of the starting position is calibrated so that when the pure iron medium-thick plate starts to move, the top of the two hydraulic cylinders acts on the irregular end face of the pure iron medium-thick plate to be simultaneously subjected to force; (3) The PLC commands the three-position four-way directional valve 2 to be energized. The medium-pressure system enters the rodless chamber of the two hydraulic cylinders through the synchronous hydraulic motor. The cylinder rod pushes the two tops to move forward synchronously. The two tops of the cylinder rod push the industrial The pure iron medium-thick plate moves forward; (4) When the minimum value of either of the two laser rangefinders is greater than 10mm, the head of the pure iron medium-thick plate has crossed the shearing line, and the hydraulic gantry shear performs a drop shear; (5) After the drop shear, the displacement sensor two feeds back the hydraulic gantry shear lower limit signal, the two displacement sensors return to 0 for the second time, the industrial computer screen mouse clicks the automatic cutting command, the three-position four-way reversing valve two is energized again, the two hydraulic cylinders push the pure iron medium-thick plate forward again, and the industrial computer now performs shearing control according to the size set by the displacement sensor one; (6) This cycle repeats until the moving speed of the two displacement sensors one is 0 at the same time, indicating that the hydraulic cylinder has contacted the presser foot, the top head is retracted to the hydraulic cylinder mechanical limit, the fixed length cutting of this piece of industrial pure iron medium-thick plate is completed, and the next piece of industrial pure iron medium-thick plate is "upper position" to enter the next closed loop.

[0013] The hydraulic unit also includes a support wheel and a hydraulic cylinder support. The support wheel is located at the lower part of the top head, and the hydraulic cylinder support is located at the lower part of the hydraulic cylinder.

[0014] The shearing unit also includes a slide, a collection trough, and a sliding rail. The sliding rail is set on the support platform, and the collection trough is set at the discharge end of the hydraulic gantry shear. The slide connects the shearing unit to the discharge end of the hydraulic gantry shear and the collection trough.

[0015] It also includes a support beam on which the laser rangefinder and camera are mounted, the height of which matches the position of the laser rangefinder with that of the hydraulic gantry shear.

[0016] The beneficial effects of this invention are: by using a hydraulic unit that combines medium and low pressure systems to control the shearing unit, and by using displacement sensors, laser rangefinders, and cameras to monitor the shearing status, precise positioning is achieved, enabling one-click automated cutting to length. This allows for the deep processing of pure iron medium and thick plates according to customer-required dimensions, thereby improving cutting efficiency. Attached Figure Description

[0017] Figure 1 This is the front view of the present invention;

[0018] Figure 2 This is a top view of the present invention;

[0019] Figure 3 This is a partial enlarged view of the main view of the present invention;

[0020] Figure 4 This is an enlarged view of the hydraulic unit of the present invention;

[0021] Figure 5 This is a diagram showing the finished state of the pure iron medium-thick plate being loaded according to the present invention;

[0022] Figure 6 This is a diagram showing the end state of the calibration at the initial 0 point of the device of the present invention;

[0023] In the diagram: 1. Low-pressure constant-pressure variable pump; 2. Medium-pressure constant-pressure variable pump; 3. Three-position four-way directional valve I; 3. Hydraulic synchronous motor; 4. Overflow valve I; 5. One-way throttle valve I; 6. Overflow valve II; 7. One-way valve I; 8. Three-position four-way directional valve II; 9. One-way throttle valve II; 10. Overflow valve III; 11. One-way valve II; 12. Hydraulic cylinder; 13. Top head; 14. Guide wheel; 15. Support platform; 16. Hydraulic gantry shear; 17. Slide; 18. Finished product shearing of pure iron medium-thick plate; 20. Laser rangefinder; 21. Support beam; 22. Support wheel; 23. Hydraulic cylinder support; 24. Displacement sensor I; 25. Three-position four-way directional valve III; 26. Electrical control cabinet; 27. Industrial computer; 28. PLC; 29. ​​Pure iron medium-thick plate; 30. Shearing hydraulic cylinder; 31. Pressing foot; 32. Displacement sensor II; 33. Camera; 34. Collection trough; 35. Sliding rail. Detailed Implementation

[0024] To make the purpose, technical solutions, and advantages of the invention's embodiments clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only a small part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0025] An industrial pure iron medium-thick plate fixed-length cutting device includes a hydraulic unit, a shearing unit and a control unit. The shearing unit includes a hydraulic gantry shear 17, guide wheels 15, a support platform 16 and a shearing hydraulic cylinder 30. The shearing hydraulic cylinder 30 is located on the top of the hydraulic gantry shear 17. The support platform 16 is located at the feeding end of the hydraulic gantry shear 17. There are four guide wheels 15, which are located on the support platform 16. The line connecting two guide wheels 15 on the same side is perpendicular to the shearing blade of the hydraulic gantry shear 17.

[0026] The hydraulic unit includes a hydraulic cylinder 13 and a hydraulic system. There are two hydraulic cylinders 13, which are located at the rear of the support platform 16. A top head 14 is provided at the head of the hydraulic cylinder 13. The top head 14 is in contact with the pure iron medium-thick plate 29. The hydraulic system includes a medium-pressure system and a low-pressure system. The medium-pressure system and the low-pressure system share an oil tank. The medium-pressure system is connected to the hydraulic cylinder 13 and drives the hydraulic cylinder 13 to move. The low-pressure system is connected to the hydraulic cylinder 13 and adjusts the starting position of the hydraulic cylinder 13.

[0027] The control unit includes a laser rangefinder 20, a displacement sensor 24, an electrical control cabinet 26, an industrial computer 27, a PLC 28, a displacement sensor 32, and a camera 33. The displacement sensor 24 is located at the tail of the hydraulic cylinder 13, and the displacement sensor 32 is located at the top of the shearing hydraulic cylinder 30. The laser rangefinder 20 and the camera 33 are located at the rear position of the hydraulic gantry shear 17. The industrial computer 27 and the PLC 28 are located inside the electrical control cabinet 26. The laser rangefinder 20, the displacement sensor 24, the displacement sensor 32, and the camera 33 are respectively connected to the PLC 28.

[0028] The low-pressure system of the hydraulic unit includes a low-pressure constant-pressure variable pump 1, a three-position four-way directional valve 3, a relief valve 11, a check valve 12, and a three-position four-way directional valve 25. The low-pressure constant-pressure variable pump 1 is connected to two hydraulic cylinders 13 through the three-position four-way directional valve 3 and the three-position four-way directional valve 25, respectively. The relief valve 11 and the check valve 12 are located between the low-pressure constant-pressure variable pump 1 and the three-position four-way directional valve 3 and the three-position four-way directional valve 25.

[0029] The medium-pressure system of the hydraulic unit includes a medium-pressure constant-pressure variable pump 2, a hydraulic synchronous motor 4, a relief valve 5, a one-way throttle valve 6, a relief valve 7, a one-way valve 8, a three-position four-way directional valve 9, and a one-way throttle valve 10. The medium-pressure constant-pressure variable pump 2 is connected to the hydraulic cylinder 13 through the three-position four-way directional valve 9. The hydraulic synchronous motor 4, one-way throttle valve 6, relief valve 7, one-way valve 8, and one-way throttle valve 10 are arranged between the three-position four-way directional valve 9 and the two hydraulic cylinders 13. The relief valve 5 is located at the front end of the three-position four-way directional valve 9, and the relief valve 7 is located at the front end of the hydraulic cylinder 13.

[0030] The hydraulic unit also includes a support wheel 22 and a hydraulic cylinder support 23. The support wheel 22 is located at the lower part of the top head 14, and the hydraulic cylinder support 23 is located at the lower part of the hydraulic cylinder 13.

[0031] The shearing unit also includes a slide 18, a collection trough 34, and a sliding rail 35. The sliding rail 35 is mounted on the support platform 16, and the collection trough 34 is mounted on the discharge end of the hydraulic gantry shear 17. The slide 18 connects the discharge end of the shearing unit, including the hydraulic gantry shear 17, to the collection trough 34.

[0032] It also includes a support beam 21, on which the laser rangefinder 20 and camera 33 are mounted. The height of the support beam 21 matches the position of the laser rangefinder 20 with that of the hydraulic gantry shear 17.

[0033] A method for cutting industrial pure iron medium-thick plates to length includes the following steps: (1) After the pure iron medium-thick plate is hot rolled offline, it is cut off by a rough length flame cutting process and then transported to the deep processing shearing area. The pure iron medium-thick plate is selected to have one long side close to any guide wheel; (2) The PLC first enters the input terminal of the displacement sensor 1 to the initial 0 point calibration state. The low-pressure system sends low-pressure oil to the two hydraulic cylinders through the three-position four-way directional valve 1 and the three-position four-way directional valve 3 respectively. The starting position of each hydraulic cylinder is adjusted, and the O point of the starting position is calibrated so that when the pure iron medium-thick plate starts to move, the top of the two hydraulic cylinders acts on the irregular end face of the pure iron medium-thick plate to be simultaneously subjected to force; (3) The PLC commands the three-position four-way directional valve 2 to be energized. The medium-pressure system enters the rodless chamber of the two hydraulic cylinders through the synchronous hydraulic motor. The cylinder rod pushes the two tops to move forward synchronously. The two tops of the cylinder rod push the industrial The pure iron medium-thick plate moves forward; (4) When the minimum value of either of the two laser rangefinders is greater than 10mm, the head of the pure iron medium-thick plate has crossed the shearing line, and the hydraulic gantry shear performs a drop shear; (5) After the drop shear, the displacement sensor two feeds back the hydraulic gantry shear lower limit signal, the two displacement sensors return to 0 for the second time, the industrial computer screen mouse clicks the automatic cutting command, the three-position four-way reversing valve two is energized again, the two hydraulic cylinders push the pure iron medium-thick plate forward again, and the industrial computer now performs shearing control according to the size set by the displacement sensor one; (6) This cycle repeats until the moving speed of the two displacement sensors one is 0 at the same time, indicating that the hydraulic cylinder has contacted the presser foot, the top head is retracted to the hydraulic cylinder mechanical limit, the fixed length cutting of this piece of industrial pure iron medium-thick plate is completed, and the next piece of industrial pure iron medium-thick plate is "upper position" to enter the next closed loop.

[0034] The hydraulic unit also includes a support wheel and a hydraulic cylinder support. The support wheel is located at the lower part of the top head, and the hydraulic cylinder support is located at the lower part of the hydraulic cylinder.

[0035] The shearing unit also includes a slide, a collection trough, and a sliding rail. The sliding rail is set on the support platform, and the collection trough is set at the discharge end of the hydraulic gantry shear. The slide connects the shearing unit to the discharge end of the hydraulic gantry shear and the collection trough.

[0036] It also includes a support beam on which the laser rangefinder and camera are mounted, the height of which matches the position of the laser rangefinder with that of the hydraulic gantry shear.

[0037] In practical applications, the following components are used: Low-pressure constant-pressure variable pump 1 (model PV50), Medium-pressure constant-pressure variable pump 2 (model PV70), Three-position four-way directional valve 1 (model 4WE6E31B / CO24-50N9Z4), Hydraulic synchronous motor 4 (model FMA-2R4.2), Relief valve 1 (model DBDH20P10 / 20), One-way throttle valve 1 (model Z2FS10-20 / S), Relief valve 2 (model DBDH20P10 / 20), One-way valve 1 (model S25A1.0B), Three-position four-way directional valve 2 (model 4WE10E31B / CO24-50N9Z4), One-way throttle valve 2 (model Z2FS10-20 / S), Relief valve 3 (model DBDH20P10 / 20), One-way valve 2 (model S25A1.0B), and Hydraulic cylinder 13 (model 120*80*12000). 14. Machining assembly of top head (200*100*100); 15. Machining assembly of guide wheel (φ300*φ100*100); 16. Riveted and welded structural component of support platform (16000*2000*900); 17. Hydraulic gantry shear (model 1500T); 18. Slide (65Mn steel plate, 2000*500*20); 20. Laser rangefinder (model 404E); 21. Support beam (200*200*10). H-beams, support wheels 22 (machined assembly, φ200*φ30*50), hydraulic cylinder support 23 (hydraulic finished component, 200*φ70*50), displacement sensor 24 (model KBM30-12000), three-position four-way directional valve 25 (model 4WE6E31B / CW24-50N9Z4), electrical control cabinet 26 (model 30*30*100CM), industrial computer 27 (model IPC-610L), PLC 28 (model S7-300), sliding rail 35 (model QU70).

[0038] Note: The unit above is millimeters (mm).

[0039] Preparation before operation: Start the low-pressure constant-pressure variable pump 1 and adjust the pressure to (0.5-1.5Mpa). Start the medium-pressure constant-pressure variable pump 2 and adjust the pressure to 10-15Mpa. Input the required length dimensions into the industrial computer 27 screen. After the pure iron medium-thick plate 29 is hot-rolled offline, it undergoes a rough length-setting flame cutting process. After passing through logistics to the deep processing shearing area, the electromagnetic chuck crane lifts the pure iron medium-thick plate 29. Choose any long side and place it against any guide wheel 15. At this time, since the head of the pure iron medium-thick plate 29 is on the feed side of the shearing line, the two laser rangefinders 20 display negative values ​​on the industrial computer 27 screen. Click the "Start 0 Point Calibration" command on the industrial computer 27 screen. PLC 28 first enters the "Start 0 Point Calibration" state of displacement sensor 24. Command 28: Three-position four-way directional valve 13 and three-position four-way directional valve 25 are simultaneously energized. Low-pressure oil enters the rodless chamber of the two hydraulic cylinders 13. The cylinder rod pushes the two mandrels 14 to move and contact the irregular end face of the pure iron medium-thick plate 29. When the displacement sensor 24 feedback that the displacement speed is equal to 0 (because the pressure is too low, the pure iron medium-thick plate 29 will not move), the zero starting point calibration of the displacement sensor 24 is completed. After a delay of 3 seconds, three-position four-way directional valve 13 and three-position four-way directional valve 25 are de-energized to the neutral position. After a 5-second delay (user-defined), PLC28 automatically enters the initial cutting 0-point calibration state. PLC28 commands the three-position four-way directional valve 29 to be energized. Medium-pressure oil enters the rodless chamber of the two hydraulic cylinders 13 through the synchronous hydraulic motor 4. The cylinder rod pushes the two mandrels 14 to move forward synchronously. The two mandrels 14 push the pure iron medium-thick plate 29 forward. When the minimum value of either of the two laser rangefinders 20 is greater than 10mm (indicating that the head of the pure iron medium-thick plate 29 has crossed the shearing line), PLC28 commands the three-position four-way directional valve 29 to be de-energized to the neutral position. After a 5-second delay, the hydraulic gantry shear 17 automatically lowers. When displacement sensor 232 feeds back the lower limit signal of the hydraulic gantry shear 17, the two displacement sensors 124 return to 0 for the second time. The initial cutting 0-point calibration is completed, which can also be called "edge calibration".

[0040] After one shearing cycle, both displacement sensors 24 return to zero for the second time. The industrial computer 27 clicks the automatic cutting command on its screen, energizing the three-position four-way directional valve 9 again. The two hydraulic cylinders 13 push the pure iron medium-thick plate 29 forward again. The industrial computer 27 controls the shearing according to the dimensions set by displacement sensors 24. For example, if the cutting length is set to 70mm, every time the hydraulic cylinder 13 advances 70mm, displacement sensor 24 sends a signal to PLC 28. The hydraulic gantry shear 17 drops once, displacement sensor 32 sends a lower limit signal to the hydraulic gantry shear 17, displacement sensor 24 returns to zero again, and the hydraulic gantry shear 17 rises. When displacement sensor 232 sends a signal to the upper limit of the hydraulic gantry shear 17, PLC 28 again commands the three-position four-way directional valve 29 to be energized and push the pure iron medium-thick plate 29 forward. The hydraulic cylinder 13 increases its thrust by 70 mm again. Displacement sensor 24 sends a signal to PLC 28, and the hydraulic gantry shear 17 drops again. When displacement sensor 232 sends a signal to the lower limit of the hydraulic gantry shear 17, displacement sensor 24 returns to zero again, and the hydraulic gantry shear 17 lifts up. When displacement sensor 232 sends a signal to the upper limit of the hydraulic gantry shear 17, PLC 28 again commands the three-position four-way directional valve 29 to be energized and push the pure iron medium-thick plate 29 forward again. This process repeats until the movement speed of both displacement sensors 1-24 simultaneously reaches 0, indicating that hydraulic cylinder 13 has made contact with the pressure foot. After a 5-second delay, PLC 28 instructs both three-position four-way directional valves 1-3 and 3-position four-way directional valve 2-25 to be energized simultaneously. Low-pressure oil enters the rod chambers of both hydraulic cylinders 13, and the cylinder rod tip 14 retracts to the mechanical limit position of the hydraulic cylinder. The movement speed of both displacement sensors 1-24 simultaneously reaches 0. After a 5-second delay, PLC 28 instructs both three-position four-way directional valves 1-3 and 3-position four-way directional valve 2-25 to be de-energized to the neutral position. The cutting of this piece of industrial pure iron medium-thick plate to length is completed, and it awaits the next piece of industrial pure iron medium-thick plate to "take over" and enter the next closed loop.

Claims

1. A device for cutting to length of an industrial pure iron medium plate, characterized in that: It includes a hydraulic unit, a shearing unit and a control unit. The shearing unit includes a hydraulic gantry shear (17), guide wheels (15), a support platform (16) and a shearing hydraulic cylinder (30). The shearing hydraulic cylinder (30) is located on the top of the hydraulic gantry shear (17). The support platform (16) is located at the feed end of the hydraulic gantry shear (17). There are four guide wheels (15), which are located on the support platform (16). The line connecting two guide wheels (15) on the same side is perpendicular to the shearing blade of the hydraulic gantry shear (17). The hydraulic unit includes a hydraulic cylinder (13) and a hydraulic system. There are two hydraulic cylinders (13), which are located at the tail of the support platform (16). The head of the hydraulic cylinder (13) is provided with a top head (14), which contacts the pure iron medium-thick plate (29). The hydraulic system includes a medium-pressure system and a low-pressure system. The medium-pressure system and the low-pressure system share an oil tank. The medium-pressure system is connected to the hydraulic cylinder (13) and drives the hydraulic cylinder (13) to move. The low-pressure system is connected to the hydraulic cylinder (13) and adjusts the starting position of the hydraulic cylinder (13). The control unit includes a laser rangefinder (20), displacement sensor 1 (24), electrical control cabinet (26), industrial computer (27), PLC (28), displacement sensor 2 (32), and camera (33). Displacement sensor 1 (24) is located at the tail of the hydraulic cylinder (13), displacement sensor 2 (32) is located at the top of the shearing hydraulic cylinder (30), and laser rangefinder (20) and camera (33) are located at the shearing position of the hydraulic gantry shear (17). Industrial computer (27) and PLC (28) are located inside electrical control cabinet (26). Laser rangefinder (20), displacement sensor 1 (24), displacement sensor 2 (32), and camera (33) are respectively connected to PLC (28).

2. The industrial pure iron medium-thick plate fixed-length cutting device according to claim 1, characterized in that: The low-pressure system of the hydraulic unit includes a low-pressure constant-pressure variable pump (1), a three-position four-way directional valve (3), a relief valve (11), a check valve (12), and a three-position four-way directional valve (25). The low-pressure constant-pressure variable pump (1) is connected to two hydraulic cylinders (13) through the three-position four-way directional valve (3) and the three-position four-way directional valve (25), respectively. The relief valve (11) and the check valve (12) are located between the low-pressure constant-pressure variable pump (1) and the three-position four-way directional valve (3) and the three-position four-way directional valve (25).

3. The industrial pure iron medium plate cutting device according to claim 1, characterized in that: The medium-pressure system of the hydraulic unit includes a medium-pressure constant pressure variable pump (2), a hydraulic synchronous motor (4), a relief valve (5), a one-way throttle valve (6), a relief valve (7), a one-way valve (8), a three-position four-way directional valve (9) and a one-way throttle valve (10). The medium-pressure constant pressure variable pump (2) is connected to the hydraulic cylinder (13) through the three-position four-way directional valve (9). The three-position four-way directional valve (9) and the two hydraulic cylinders (13) are provided with a hydraulic synchronous motor (4), a one-way throttle valve (6), a relief valve (7), a one-way valve (8) and a one-way throttle valve (10). The relief valve (5) is located at the front end of the three-position four-way directional valve (9), and the relief valve (7) is located at the front end of the hydraulic cylinder (13).

4. The industrial pure iron medium plate cutting device according to claim 1, characterized in that: The hydraulic unit also includes a support wheel (22) and a hydraulic cylinder support (23). The support wheel (22) is located at the lower part of the top head (14), and the hydraulic cylinder support (23) is located at the lower part of the hydraulic cylinder (13).

5. The industrial pure iron medium plate cutting device according to claim 1, characterized in that: The shearing unit also includes a slide (18), a collection trough (34) and a sliding rail (35). The sliding rail (35) is set on the support platform (16), and the collection trough (34) is set at the discharge end of the hydraulic gantry shear (17). The slide (18) connects the discharge end of the shearing unit, including the hydraulic gantry shear (17), to the collection trough (34).

6. The industrial pure iron medium plate cutting device according to claim 1, characterized in that: It also includes a support beam (21), on which the laser rangefinder (20) and camera (33) are mounted, the height of which matches the position of the laser rangefinder (20) with that of the hydraulic gantry shear (17).

7. A method for cutting industrial pure iron medium plate to a desired length using the industrial pure iron medium plate cutting apparatus according to claim 1, characterized by, The process includes the following steps: (1) After the hot rolling of the pure iron medium-thick plate offline, it is cut off by flame cutting once to a rough length and then transported to the deep processing shearing area. The pure iron medium-thick plate is selected to have one long side close to the guide wheel on any side; (2) The PLC first enters the initial 0 point calibration state of the displacement sensor one. The low pressure system sends low pressure oil to the two hydraulic cylinders through the three-position four-way reversing valve one and the three-position four-way reversing valve three respectively. The starting position of each hydraulic cylinder is adjusted and the O point of the starting position is calibrated so that when the pure iron medium-thick plate starts to move, the top of the two hydraulic cylinders acts on the irregular end face of the pure iron medium-thick plate to be simultaneously stressed when it starts; (3) The PLC commands the three-position four-way reversing valve two to be energized. The medium pressure system enters the rodless chamber of the two hydraulic cylinders through the synchronous hydraulic motor. The cylinder rod pushes the two tops to move forward synchronously. The two tops of the cylinder rod push the industrial pure iron medium-thick plate forward. (4) When the minimum value of either of the two laser rangefinders is greater than 10mm, the head of the pure iron medium-thick plate has crossed the shearing line, and the hydraulic gantry shear performs a drop shear; (5) After the drop shear, the displacement sensor two feeds back the hydraulic gantry shear lower limit signal, the two displacement sensors return to 0 for the second time, the industrial computer screen mouse clicks the automatic cutting command, the three-position four-way reversing valve two is energized again, the two hydraulic cylinders push the pure iron medium-thick plate forward again, and the industrial computer now performs shearing control according to the size set by the displacement sensor one; (6) This cycle continues until the moving speed of the two displacement sensors one is 0 at the same time, indicating that the hydraulic cylinder has contacted the presser foot, the top head is retracted to the hydraulic cylinder mechanical limit, the fixed length cutting of this piece of industrial pure iron medium-thick plate is completed, and it waits for the next piece of industrial pure iron medium-thick plate to "go up" to enter the next closed loop.

8. The method of cutting a plate of industrial pure iron to a desired length according to claim 7, wherein: The hydraulic unit also includes a support wheel and a hydraulic cylinder support. The support wheel is located at the lower part of the top head, and the hydraulic cylinder support is located at the lower part of the hydraulic cylinder.

9. The method of cutting a plate of industrial pure iron to a desired length according to claim 7, wherein: The shearing unit also includes a slide, a collection trough, and a sliding rail. The sliding rail is set on the support platform, and the collection trough is set at the discharge end of the hydraulic gantry shear. The slide connects the shearing unit to the discharge end of the hydraulic gantry shear and the collection trough.

10. A method for cutting industrial pure iron medium-thick plates to length according to claim 7, characterized in that: It also includes a support beam on which the laser rangefinder and camera are mounted, the height of which matches the position of the laser rangefinder with that of the hydraulic gantry shear.

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