Flexible heavy scrap gantry shearing machine with dynamic change of knife height and shearing method

Abstract

The present application relates to the technical field of metal scrap shearing machine, in particular to a flexible heavy scrap gantry shearing machine with dynamic change of lifting knife height and a shearing method, comprising a first photoelectric distance measuring sensor for measuring the height position of a pressing head of the heavy scrap gantry shearing machine, which is arranged on a main frame of the heavy scrap gantry shearing machine and located above the pressing head; a second photoelectric distance measuring sensor for measuring the height position of a shearing head of the heavy scrap gantry shearing machine, which is arranged on the main frame of the heavy scrap gantry shearing machine and located above the shearing head; the first photoelectric distance measuring sensor and the second photoelectric distance measuring sensor are respectively connected to a control system of the heavy scrap gantry shearing machine. The present application significantly improves the shearing efficiency of scrap steel under the premise of ensuring shearing safety.

Description

Technical Field

[0001] This invention relates to the field of metal scrap shearing technology, specifically to a flexible heavy scrap gantry shear with dynamically changing blade lifting height and a shearing method. Background Technology

[0002] The heavy-duty gantry shear is a large-scale scrap steel processing equipment that can shear various types of scrap steel, billets, steel pipes, steel structural parts, and scrapped automobiles. It can provide high-quality furnace feed for the metallurgical industry and is an important processing equipment for the metallurgical industry and large-scale metal recycling industry.

[0003] A typical heavy scrap gantry shear consists of a main shear unit and a feeding hopper, a material bin, etc., connected to the main shear unit. The main shear unit includes a main frame and a pressing mechanism and a shearing mechanism respectively mounted on the main frame. A pushing mechanism is installed on the material bin connected to the main frame to push the scrap steel in the bin onto the lower blade holder of the shearing mechanism. The pressing mechanism is responsible for pressing and fixing the scrap steel onto the lower blade holder. After pressing, the shear head located above the lower blade holder moves downward to cut the scrap steel. After each cut, the shear head lifts upward, the pressing mechanism releases, and then the pushing mechanism pushes the scrap steel forward a certain distance. The pressing mechanism then re-presses, and the shear head moves downward to cut again, thus forming continuous cutting of scrap steel.

[0004] In the entire shearing process of the aforementioned heavy waste gantry shear, the action of the shear head takes the longest.

[0005] The aforementioned heavy-duty scrap gantry shear has the following problems during use: The stroke of the shear head on the heavy-duty scrap gantry shear is controlled by a limit switch. After the limit switch is set, the lifting height of the shear head is a constant value. However, for heavy-duty scrap gantry shears, due to the variety of scrap steel specifications being sheared and the uneven distribution of scrap steel added to the hopper each time, the height of the scrap steel pushed onto the lower blade holder often varies. For example, for a heavy-duty scrap gantry shear with a maximum shearing height of 1000mm, the height of the scrap steel pushed onto the lower blade holder varies by more than 300mm. Therefore, if the lifting height of the shear head is set too low, it may cause a safety problem of blade collision during material pushing. Therefore, the lifting height of the shear head usually needs to be set higher. However, while this solves the safety problem, it also brings the disadvantage of excessively long idle stroke time of the shear head, thus reducing shearing efficiency. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes a flexible heavy-duty scrap gantry shear with dynamically varying blade height and a shearing method, aiming to improve scrap steel shearing efficiency while ensuring shearing safety. The specific technical solution is as follows:

[0007] A flexible heavy waste gantry shear with dynamically changing blade height includes a first photoelectric distance sensor for measuring the height of the pressure head, mounted on the main frame of the heavy waste gantry shear and positioned above the pressure head; and a second photoelectric distance sensor for measuring the height of the shear head, mounted on the main frame of the heavy waste gantry shear and positioned above the shear head. The first and second photoelectric distance sensors are respectively connected to the control system of the heavy waste gantry shear.

[0008] Preferably, the main frame of the heavy waste gantry shear includes a left wall plate, a right wall plate, a lower blade holder connected at the lower part between the left wall plate and the right wall plate, and an upper beam connected at the upper part between the left wall plate and the right wall plate; the first photoelectric ranging sensor and the second photoelectric ranging sensor are respectively disposed on the upper beam.

[0009] In this invention, the heavy waste gantry shear also includes a material box connected to the main frame, a pushing cylinder mounted on the material box, a pressing cylinder and a servo shearing cylinder mounted on the top beam of the main frame, and side-push cylinders mounted on the left and right side wall plates of the main frame. The front end of the pushing cylinder is provided with a pushing head, and the front end of the pressing cylinder is provided with a pressing head. The front end of the servo shearing cylinder is provided with a shear head, and the front end of the side-push cylinder is provided with a side-push head. The pushing cylinder, pressing cylinder, servo shearing cylinder, and side-push cylinder are respectively connected to the control system.

[0010] Preferably, the control system is a PLC control system.

[0011] A flexible shearing method for a flexible heavy waste gantry shear with dynamically changing blade lifting height includes the following:

[0012] (1) Setting of photoelectric ranging sensor: A first photoelectric ranging sensor is set on the main frame of the heavy waste gantry shear and above the pressing head of the heavy waste gantry shear. A second photoelectric ranging sensor is set on the main frame of the heavy waste gantry shear and above the shear head of the heavy waste gantry shear. The first photoelectric ranging sensor and the second photoelectric ranging sensor are respectively connected to the control system of the heavy waste gantry shear.

[0013] (2) Monitoring of the shearing process: During the shearing process, the control system dynamically monitors the height position of the pressing head through the first photoelectric distance sensor and the height position of the shear head through the second photoelectric distance sensor.

[0014] (3) Setting of shearing process and lifting height: The shearing process of the heavy scrap gantry shear includes the feeding action of pushing the scrap steel to be sheared onto the lower blade holder of the heavy scrap gantry shear, the pressing action of pressing and fixing the scrap steel to be sheared onto the lower blade holder through the pressing head, the shearing action of cutting the pressed scrap steel to be sheared through the shear head, and the lifting action of retracting the shear head after shearing. The feeding action, pressing action, shearing action and lifting action are performed in a cycle, and the continuous shearing of the heavy scrap gantry shear is achieved through the cycle of the feeding action, pressing action, shearing action and lifting action. The lifting height set in the lifting action in each action cycle is determined by the pressing height after the pressing action in that action cycle is completed. The formula is: Lifting height H2 = Pressing height H1 + Safety margin Δ.

[0015] The safety margin Δ is 80-120 mm.

[0016] The pressing height H1 is calculated according to the following formula: H1 = L - A - D1; where L is the distance between the lower end face of the upper beam of the main frame of the heavy waste gantry shear and the upper end face of the lower blade holder, A is the thickness of the pressing head, and D1 is the distance between the lower end face of the upper beam and the upper end face of the pressing head when the pressing action is completed, as measured by the first photoelectric distance sensor.

[0017] The lifting height H2 is controlled by the following method: the distance D2 between the lower end face of the upper beam and the upper end face of the scissor head is monitored by the second photoelectric distance sensor, so that after the scissor head lifting action is completed, the distance D2 between the lower end face of the upper beam and the upper end face of the scissor head is L - B - (L - A - D1 + Δ) = A + D1 - B - Δ; where B is the maximum thickness of the scissor head in the vertical direction.

[0018] Preferably, the shearing operation flow of the heavy waste gantry shear is as follows:

[0019] S1. Feeding action: The loose scrap steel to be sheared is added to the hopper of the heavy scrap gantry shear by a steel grabber or an electromagnetic chuck.

[0020] S2. Pushing action: Under the control of the control system of the heavy scrap gantry shear, the pushing cylinder of the heavy scrap gantry shear moves, so that the pushing head at the front end of the pushing cylinder moves forward according to the scrap steel cutting length set in the program, and sends the scrap steel into the lower blade table in the main frame of the heavy scrap gantry shear.

[0021] S3. Gathering action: The side push cylinders on both sides of the main frame of the heavy scrap gantry shear are activated, causing the side push head at the front end of the side push cylinder to move forward and gather the loose scrap steel on the lower cutter table to the middle position. After reaching the middle position, the side push cylinder retracts and resets.

[0022] S4. Pressing action: The pressing cylinder on the main frame of the heavy scrap gantry shear is activated, causing the pressing head at the front end of the pressing cylinder to move downward and press the scrap steel that has been closed and joined on the lower cutter table.

[0023] S5. Shearing action: The servo shearing cylinder on the main frame of the heavy scrap gantry shearing machine moves downward, causing the shear head at the front end of the servo shearing cylinder to shear the scrap steel.

[0024] S6. Lifting action: The servo shearing cylinder on the main frame of the heavy waste gantry shearing machine moves, causing the shear head at the front end of the servo shearing cylinder to lift upward, and making the lifting height of the shear head H2 = pressing height H1 + safety margin Δ.

[0025] S7. Pressing head return action: The pressing cylinder on the main frame of the heavy scrap gantry shear is activated, causing the pressing head at the front end of the pressing cylinder to retract upwards, so that the pressing head is completely released from the scrap steel on the lower cutter table.

[0026] S8. Pushing action: The pushing cylinder of the heavy scrap gantry shear moves forward, causing the pushing head at the front end of the pushing cylinder to advance forward according to the scrap steel cutting length set in the program.

[0027] S9. Judgment: The control system determines whether the pusher head has been pushed to the limit position by controlling the limit switch of the pusher head position. If the pusher head has not been pushed to the limit position, the shearing action of steps S3 to S8 is repeated. If the pusher head has been pushed to the limit position, it indicates that the scrap steel in the hopper has been used up. Then the pusher cylinder retracts and resets, and the shearing action of steps S1 to S8 is repeated.

[0028] As a further improvement of the present invention, the shearing operation process of the heavy scrap gantry shear also includes step S5A, which is set between steps S5 and S6, and the pressure head slightly loosening action: the pressure cylinder on the main frame of the heavy scrap gantry shear is depressurized, so that the pressure head at the lower end of the pressure cylinder makes a slight retraction, thereby causing the pressure head to slightly loosen the scrap steel located on the lower blade table.

[0029] The beneficial effects of this invention are:

[0030] By installing a first photoelectric distance sensor and a second photoelectric distance sensor on the main frame of the heavy scrap gantry shear, the lifting height of the shear head can be dynamically set according to the change of the pressing height, thereby significantly reducing the idle stroke time of the shear head and thus greatly improving the scrap shearing efficiency. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the flexible shearing process of a flexible heavy waste gantry shear with dynamically changing blade lifting height according to the present invention.

[0032] Figure 2 This is a schematic diagram of the main unit of the flexible heavy waste gantry shear.

[0033] Figure 3 yes Figure 2 Rear view;

[0034] Figure 4 It is a combination Figure 2 and Figure 3 A schematic diagram for calculating the lifting height of the blade.

[0035] In the diagram: 1. Main frame, 2. Pressing head, 3. First photoelectric ranging sensor, 4. Scissor head, 5. Second photoelectric ranging sensor, 6. Left wall panel, 7. Right wall panel, 8. Lower cutter holder, 9. Upper beam, 10. Side push cylinder, 11. Pressing cylinder, 12. Servo shearing cylinder.

[0036] In the diagram: H1 is the pressing height, H2 is the lifting height, Δ is the safety margin, L is the distance between the lower end face of the upper beam of the main frame of the heavy waste gantry shear and the upper end face of the lower blade holder, A is the thickness of the pressing head, D1 is the distance between the lower end face of the upper beam and the upper end face of the pressing head when the pressing action is completed, measured by the first photoelectric distance sensor, D2 is the distance between the lower end face of the upper beam and the upper end face of the shear head, measured by the second photoelectric distance sensor, and B is the maximum thickness of the shear head in the vertical direction. Detailed Implementation

[0037] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0038] Example 1:

[0039] like Figures 1 to 4 The illustration shows an embodiment of a flexible heavy waste gantry shear with dynamically changing blade height according to the present invention. It includes a first photoelectric distance sensor 3 for measuring the height of the pressure head 2, which is mounted on the main frame 1 of the heavy waste gantry shear and located above the pressure head 2 of the heavy waste gantry shear; and a second photoelectric distance sensor 5 for measuring the height of the scissor head 4, which is mounted on the main frame 1 of the heavy waste gantry shear and located above the scissor head 4 of the heavy waste gantry shear. The first photoelectric distance sensor 3 and the second photoelectric distance sensor 5 are respectively connected to the control system of the heavy waste gantry shear.

[0040] Preferably, the main frame 1 of the heavy waste gantry shear includes a left wall plate 6, a right wall plate 7, a lower blade holder 8 connected at the lower position between the left wall plate 6 and the right wall plate 7, and an upper beam 9 connected at the upper position between the left wall plate 6 and the right wall plate 7; the first photoelectric distance sensor 3 and the second photoelectric distance sensor 5 are respectively disposed on the upper beam 9.

[0041] In this embodiment, the heavy waste gantry shear also includes a material box (not shown in the figure) connected to the main frame 1, a pushing cylinder mounted on the material box, a pressing cylinder 11 and a servo shearing cylinder 12 mounted on the top beam 9 of the main frame 1, and side-push cylinders 10 mounted on the left wall plate 6 and right wall plate 7 on both sides of the main frame 1. The front end of the pushing cylinder is provided with a pushing head, and the front end of the pressing cylinder 11 is provided with a pressing head 2. The front end of the servo shearing cylinder 12 is provided with a shear head 4, and the front end of the side-push cylinder 10 is provided with a side-push head. The pushing cylinder, pressing cylinder 11, servo shearing cylinder 12 and side-push cylinder 10 are respectively connected to the control system.

[0042] Preferably, the control system is a PLC control system.

[0043] Example 2:

[0044] like Figures 1 to 4 The illustration shows an embodiment of a flexible shearing method for a flexible heavy waste gantry shear with dynamically changing blade lifting height, including the following:

[0045] (1) Setting of photoelectric distance measuring sensor: A first photoelectric distance measuring sensor 3 is set on the main frame 1 of the heavy waste gantry shear and above the pressing head 2 of the heavy waste gantry shear. A second photoelectric distance measuring sensor 5 is set on the main frame 1 of the heavy waste gantry shear and above the shear head 4 of the heavy waste gantry shear. The first photoelectric distance measuring sensor 3 and the second photoelectric distance measuring sensor 4 are respectively connected to the control system of the heavy waste gantry shear.

[0046] (2) Monitoring of the shearing process: During the shearing process, the control system dynamically monitors the height position of the pressing head 2 through the first photoelectric distance sensor 3 and the height position of the shear head 4 through the second photoelectric distance sensor 5.

[0047] (3) Setting of shearing process and lifting height: The shearing process of the heavy scrap gantry shear includes the feeding action of pushing the scrap steel to be sheared onto the lower blade holder 8 of the heavy scrap gantry shear, the pressing action of pressing and fixing the scrap steel to be sheared onto the lower blade holder 8 through the pressing head 2, the shearing action of cutting the pressed scrap steel to be sheared through the shear head 4, and the lifting action of retracting the shear head 4 after shearing. The feeding action, pressing action, shearing action and lifting action are performed in a cycle, and the continuous shearing of the heavy scrap gantry shear is achieved through the cycle of the feeding action, pressing action, shearing action and lifting action. The lifting height set in the lifting action in each action cycle is determined by the pressing height after the pressing action in that action cycle is completed. The formula is: Lifting height H2 = Pressing height H1 + Safety margin Δ.

[0048] The safety margin Δ is 80-120 mm.

[0049] The pressing height H1 is calculated according to the following formula: H1 = L - A - D1; where L is the distance between the lower end face of the upper beam 9 of the main frame 1 of the heavy waste gantry shear and the upper end face of the lower blade holder 8, A is the thickness of the pressing head 2, and D1 is the distance between the lower end face of the upper beam 9 and the upper end face of the pressing head 2 when the pressing action is completed, as measured by the first photoelectric distance sensor 3.

[0050] The lifting height H2 is controlled by the following method: the distance D2 between the lower end face of the upper beam 9 and the upper end face of the scissor head 4 is monitored by the second photoelectric distance sensor 5, so that after the scissor head lifting action is completed, the distance D2 between the lower end face of the upper beam 9 and the upper end face of the scissor head 4 is L - B - (L - A - D1 + Δ) = A + D1 - B - Δ; where B is the maximum thickness of the scissor head 4 in the vertical direction.

[0051] Preferably, the shearing operation flow of the heavy waste gantry shear is as follows:

[0052] S1. Feeding action: The loose scrap steel to be sheared is added to the hopper of the heavy scrap gantry shear by a steel grabber or an electromagnetic chuck.

[0053] S2, Pushing action: Under the control of the control system of the heavy scrap gantry shear, the pushing cylinder of the heavy scrap gantry shear moves, so that the pushing head at the front end of the pushing cylinder moves forward according to the scrap steel cutting length set in the program, and sends the scrap steel into the lower blade holder 8 table in the main frame 1 of the heavy scrap gantry shear.

[0054] S3. Material gathering action: The side push cylinders 10 on both sides of the main frame 1 of the heavy scrap gantry shear machine move, causing the side push head at the front end of the side push cylinder 10 to move forward, gather the scattered scrap steel on the table of the lower cutter holder 8 and gather it to the middle position. After it is in place, the side push cylinder retracts and resets.

[0055] S4. Pressing action: The pressing cylinder 11 on the main frame 1 of the heavy scrap gantry shear is activated, causing the pressing head 2 at the front end of the pressing cylinder 11 to move downward and press the scrap steel that has been closed and joined together on the lower cutter holder 8.

[0056] S5. Shearing action: The servo shearing cylinder 12 on the main frame 1 of the heavy scrap gantry shearing machine is activated, causing the shear head at the front end of the servo shearing cylinder 12 to move downward and shear the scrap steel.

[0057] S6. Lifting action: The servo shearing cylinder 12 on the main frame 1 of the heavy waste gantry shearing machine moves, causing the shear head 4 at the front end of the servo shearing cylinder 12 to lift upward, and making the lifting height H2 of the shear head 4 = pressing height H1 + safety margin Δ.

[0058] S7. Pressing head return action: The pressing cylinder 11 on the main frame 1 of the heavy scrap gantry shear is activated, causing the pressing head 2 at the front end of the pressing cylinder 11 to retract upwards, so that the pressing head 2 is completely released from the scrap steel on the table of the lower cutter seat 8.

[0059] S8. Pushing action: The pushing cylinder of the heavy scrap gantry shear moves forward, causing the pushing head at the front end of the pushing cylinder to advance forward according to the scrap steel cutting length set in the program.

[0060] S9. Judgment: The control system determines whether the pusher head has been pushed to the limit position by controlling the limit switch of the pusher head position. If the pusher head has not been pushed to the limit position, the shearing action of steps S3 to S8 is repeated. If the pusher head has been pushed to the limit position, it indicates that the scrap steel in the hopper has been used up. Then the pusher cylinder retracts and resets, and the shearing action of steps S1 to S8 is repeated.

[0061] As a further improvement of this embodiment, the shearing operation process of the heavy scrap gantry shear also includes step S5A, which is set between steps S5 and S6, and the slight loosening action of the pressing head 2: the pressing cylinder 11 on the main frame 1 of the heavy scrap gantry shear is depressurized, so that the pressing head 2 at the lower end of the pressing cylinder 11 makes a slight retraction, thereby causing the pressing head 2 to slightly loosen the scrap steel located on the table of the lower cutter seat 8.

[0062] Example 3:

[0063] A conventional heavy-duty gantry shear with a maximum shearing height of 1000mm was used to shear a batch of loose scrap steel. This batch of scrap steel consisted entirely of rigid material with no height change when compressed. Due to the variety of scrap steel specifications and the uneven distribution of scrap steel added to the hopper each time, the height of the scrap steel pushed onto the lower cutter head varied each time. Specifically, 50% of the scrap steel was fed onto the lower cutter head at a height of approximately 100mm, 25% at approximately 200mm, and 25% at approximately 400mm. Therefore, a fixed safety lifting height of 500mm was set for the shear head.

[0064] Example 4:

[0065] A flexible heavy-duty scrap gantry shear with a maximum shearing height of 1000mm was used to shear a batch of loose scrap steel. This batch of scrap steel consisted entirely of rigid material with no height change when compressed. Due to the variety of scrap steel specifications and the uneven distribution of scrap steel added to the hopper each time, the height of the scrap steel pushed onto the lower blade holder varied each time. Specifically, 50% of the scrap steel was fed to the lower blade holder at a height of approximately 100mm, 25% at approximately 200mm, and 25% at approximately 400mm. Therefore, the shear head lifting height was dynamically set during the shearing process: the safe lifting height H2 was set as follows: H2 = pressing height H1 + safety margin Δ, where the safety margin Δ = 100mm.

[0066] Since this batch of scrap steel is entirely rigid material with no height change during compaction, the compaction height H1 is equal to the feeding height. Therefore, the cutter lifting height for different feeding heights is as follows:

[0067] The lifting height is 200mm when the feeding height is around 100mm; 300mm when the feeding height is around 200mm; and 500mm when the feeding height is around 400mm.

[0068] Based on the proportion of scrap steel at different feeding heights, the average blade lifting height for shearing this batch of loose scrap steel is calculated according to weights as follows:

[0069] (200mm×50%+300mm×25%+500mm×25%) / (50%+25%+25%)=100+75+125=300mm.

[0070] Example 5:

[0071] Comparing Example 3 and Example 4, it was found that the average blade lifting height (300mm) of the flexible heavy waste gantry shear is 60% of the blade lifting height (500mm) of the conventional heavy waste gantry shear, which reduces the blade lifting height by 40%.

[0072] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A flexible heavy-duty gantry shear with dynamically changing blade lifting height, characterized in that, The system includes a first photoelectric distance sensor mounted on the main frame of the heavy waste gantry shear and positioned above the pressure head for continuous monitoring of the height of the pressure head, and a second photoelectric distance sensor mounted on the main frame of the heavy waste gantry shear and positioned above the shear head for continuous monitoring of the height of the shear head. The first and second photoelectric distance sensors are respectively connected to the control system of the heavy waste gantry shear. The detection light beam from the first photoelectric distance sensor points downwards in the vertical direction towards the pressure head, and the detection light beam from the second photoelectric distance sensor points downwards in the vertical direction towards the shear head. The shearing operation flow of the heavy waste gantry shear is as follows: S1. Feeding action: The loose scrap steel to be sheared is added to the hopper of the heavy scrap gantry shear by a steel grabber or an electromagnetic chuck. S2. Pushing action: Under the control of the control system of the heavy scrap gantry shear, the pushing cylinder of the heavy scrap gantry shear moves, so that the pushing head at the front end of the pushing cylinder moves forward according to the scrap steel cutting length set in the program, and sends the scrap steel into the lower blade table in the main frame of the heavy scrap gantry shear. S3. Gathering action: The side push cylinders on both sides of the main frame of the heavy scrap gantry shear are activated, causing the side push head at the front end of the side push cylinder to move forward and gather the loose scrap steel on the lower cutter table to the middle position. After reaching the middle position, the side push cylinder retracts and resets. S4. Pressing action: The pressing cylinder on the main frame of the heavy scrap gantry shear is activated, causing the pressing head at the front end of the pressing cylinder to move downward and press the scrap steel that has been closed and joined on the lower cutter table. S5. Shearing action: The servo shearing cylinder on the main frame of the heavy scrap gantry shearing machine moves downward, causing the shear head at the front end of the servo shearing cylinder to shear the scrap steel. S6. Lifting Action: The servo shearing cylinder on the main frame of the heavy waste gantry shearing machine moves, causing the shear head at the front end of the servo shearing cylinder to lift upwards, and making the lifting height H2 of the shear head = pressing height H1 + safety margin Δ; where the pressing height H1 is calculated according to the following formula: H1 = L - A - D1; where L is the distance between the lower end face of the upper beam of the main frame of the heavy waste gantry shearing machine and the upper end face of the lower blade holder, A is the thickness of the pressing head, and D1 is the distance between the lower end face of the upper beam and the upper end face of the pressing head when the pressing action is completed, as measured by the first photoelectric distance sensor; the lifting height H2 is controlled by the following method: the distance D2 between the lower end face of the upper beam and the upper end face of the shear head is monitored by the second photoelectric distance sensor, so that after the shear head lifting action is completed, the distance D2 between the lower end face of the upper beam and the upper end face of the shear head is D2 = L - B - (L - A - D1 + Δ) = A + D1 - B - Δ; where B is the maximum thickness of the shear head in the vertical direction. S7. Pressing head return action: The pressing cylinder on the main frame of the heavy scrap gantry shear is activated, causing the pressing head at the front end of the pressing cylinder to retract upwards, so that the pressing head is completely released from the scrap steel on the lower cutter table. S8. Pushing action: The pushing cylinder of the heavy scrap gantry shear moves forward, causing the pushing head at the front end of the pushing cylinder to advance forward according to the scrap steel cutting length set in the program. S9. Judgment: The control system determines whether the pusher head has been pushed to the limit position by controlling the limit switch of the pusher head position. If the pusher head has not been pushed to the limit position, the shearing action of steps S3 to S8 is repeated. If the pusher head has been pushed to the limit position, it indicates that the scrap steel in the hopper has been used up. Then the pusher cylinder retracts and resets, and the shearing action of steps S1 to S8 is repeated. The shearing process of the heavy scrap gantry shear also includes step S5A, which is set between steps S5 and S6: the pressure head slightly loosens. The pressure cylinder on the main frame of the heavy scrap gantry shear is depressurized, so that the pressure head at the lower end of the pressure cylinder makes a slight retraction, thereby slightly loosening the scrap steel located on the lower blade table.

2. The flexible heavy waste gantry shear with dynamically changing blade lifting height according to claim 1, characterized in that, The main frame of the heavy waste gantry shear includes a left wall plate, a right wall plate, a lower blade holder connected between the left and right wall plates at a lower position, and an upper beam connected between the left and right wall plates at an upper position; the first photoelectric ranging sensor and the second photoelectric ranging sensor are respectively installed on the upper beam.

3. A flexible heavy waste gantry shear with dynamically changing blade lifting height according to claim 2, characterized in that, The heavy waste gantry shear also includes a material box connected to the main frame, a pushing cylinder mounted on the material box, a pressing cylinder and a servo shearing cylinder mounted on the top beam of the main frame, and side pushing cylinders mounted on the left and right side wall plates of the main frame. The front end of the pushing cylinder is provided with a pushing head, and the front end of the pressing cylinder is provided with a pressing head. The front end of the servo shearing cylinder is provided with a shear head, and the front end of the side pushing cylinder is provided with a side pushing head. The pushing cylinder, pressing cylinder, servo shearing cylinder, and side pushing cylinder are respectively connected to the control system.

4. A flexible heavy-duty gantry shear with dynamically changing blade lifting height according to claim 3, characterized in that, The control system is a PLC control system.

5. A flexible shearing method for a flexible heavy-duty gantry shear with dynamically changing blade lifting height as described in any one of claims 1 to 4, characterized in that, Includes the following: (1) Setting of photoelectric distance measuring sensor: A first photoelectric distance measuring sensor is set on the main frame of the heavy waste gantry shear and above the pressing head of the heavy waste gantry shear. A second photoelectric distance measuring sensor is set on the main frame of the heavy waste gantry shear and above the shear head of the heavy waste gantry shear. The first photoelectric distance measuring sensor and the second photoelectric distance measuring sensor are respectively connected to the control system of the heavy waste gantry shear. (2) Monitoring of the shearing process: During the shearing process, the control system dynamically monitors the height position of the pressing head through the first photoelectric distance sensor and the height position of the shear head through the second photoelectric distance sensor. (3) Setting of shearing process and lifting height: The shearing process of the heavy scrap gantry shear includes the feeding action of pushing the scrap steel to be sheared onto the lower blade seat of the heavy scrap gantry shear, the pressing action of pressing and fixing the scrap steel to be sheared onto the lower blade seat through the pressing head, the shearing action of cutting the pressed scrap steel to be sheared through the shear head, and the lifting action of retracting the shear head after shearing. The feeding action, pressing action, shearing action and lifting action are performed in a cycle, and the continuous shearing of the heavy scrap gantry shear is achieved through the cycle of the feeding action, pressing action, shearing action and lifting action. The lifting height set in the lifting action in each cycle is determined by the pressing height after the pressing action in the cycle is completed. The formula is: Lifting height H2 = Pressing height H1 + Safety margin Δ.

6. The flexible shearing method of a flexible heavy waste gantry shear with dynamically changing blade lifting height according to claim 5, characterized in that, The safety margin Δ = 80~120mm.

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