Connecting rod double-layer hydraulic transverse cutting shear capable of feeding tailings and performing fixed-length clamping and feeding and using method of connecting rod double-layer hydraulic transverse cutting shear

Abstract

The invention relates to the field of accessory devices of shearing machines or shearing equipment, in particular to a connecting rod double-layer hydraulic transverse cutting shear capable of feeding tailings and performing fixed-length clamping and feeding and a using method of the connecting rod double-layer hydraulic transverse cutting shear. The connecting rod double-layer hydraulic transverse cutting shear capable of feeding the tailings and performing fixed-length clamping and feeding comprises a fixed machine frame (1) and a movable machine frame (2) and is characterized by further comprising a shearing assembly (3) and a clamping and feeding assembly (4), the fixed machine frame (1) is fixed to the ground, and the movable machine frame (2) is movably arranged on a rail (21); the shearing assembly (3) comprises a pull rod (31), a shearing knife rest (32), a shearing knife (33), a shearing hydraulic cylinder (34), a transmission mechanism (35) and a fixed knife rest (36); the clamping and conveying assembly (4) comprises two clamping and conveying rollers (41), a clamping and conveying hydraulic cylinder (43) and a feeding turning plate (44). The using method of the connecting rod double-layer hydraulic transverse cutting shear capable of conveying the tailings and performing fixed-length clamping conveying is characterized by sequentially comprising the following steps of S1, initialization; s2, shearing; s3, repeating; s4, ending; and S5, performing offline maintenance. The device has few faults and high shearing quality.

Description

Technical Field

[0001] The present invention relates to the field of auxiliary devices for guillotine shears or shearing equipment, and in particular to a connecting rod double-layer hydraulic cross-cut shears capable of feeding the tail material and feeding and clamping at a fixed length and its usage method. Background Art

[0002] In a continuous production cold-rolled strip processing line unit, a cross-cut shears device is configured at the entrance section for cutting the head and tail of the strip. The smoothness and quality of shearing affect the coherence of the production rhythm of the entire unit. In the previous equipment configuration, generally a set of cross-cut shears is configured for each of the upper and lower channels. A hydraulic cylinder is used to directly push the tool holder up and down for shearing, and a gear rack is used to keep the two side hydraulic cylinders mechanically synchronized. The tool holder generally pushes and shears from bottom to top, which is called the down-cut type. When cutting the strip head, the position of the strip head is detected by the first light spot switch, and then the length of the strip is calculated through the uncoiler encoder and the PLC. When the second photoelectric switch detects the strip head, the pinch rolls are pressed down, and shearing starts according to the set waste plate length and quantity. When cutting the strip tail, by calculating the remaining coil length, the pinch rolls are pressed down, and shearing starts according to the set waste plate length and quantity.

[0003] Problems existing in this equipment: 1. Independent cross-cut shears are configured for each of the upper and lower channels, occupying a large space, and it is inconvenient to change tools and perform maintenance. Especially for the lower channel, the upper part is blocked by various equipment.

[0004] 2. The two shearing hydraulic cylinders are respectively installed on both sides. Although there is gear rack synchronization, due to the existence of tooth clearance, the synchronization is not good, affecting the shearing quality.

[0005] 3. It is found in actual on-site use that in the form where the fixed tool holder is on the upper part and the shearing tool holder is on the lower part and pushes and shears upward, although it can better control the plate shape after shearing and reduce the downward bending of the strip head, it is also easy to cause the cut edge of the thin strip to be pulled and curled.

[0006] 4. Due to the deviation between the program length calculation and the actual length of the strip, when cutting the tail, the length of the last waste plate is often less than the distance from the pinch rolls to the cutting edge. The direct problem brought about by this is that the last waste plate stays in place and cannot slide into the waste chute by itself. Summary of the Invention

[0007] In order to overcome the defects of the prior art and provide a shearing equipment with few faults and high shearing quality, the present invention discloses a connecting rod double-layer hydraulic cross-cut shears capable of feeding the tail material and feeding and clamping at a fixed length and its usage method.

[0008] The present invention achieves the invention purpose through the following technical solutions: A connecting rod double-layer hydraulic cross-cut shears capable of feeding the tail material and feeding and clamping at a fixed length, including a fixed frame and a moving frame, characterized in that: it further includes a shearing assembly and a pinch feeding assembly. The fixed frame is fixed to the ground. A track is provided at the lower part of the fixed frame, which is laid from outside the fixed frame to inside the fixed frame. The movable frame is movably arranged on the track through the rollers at the bottom. A frame moving hydraulic cylinder is also provided at the bottom of the fixed frame. The movable end of the piston rod of the frame moving hydraulic cylinder is connected to the movable frame; The shearing assembly includes a pull rod, a shearing tool holder, a shearing tool, a shearing hydraulic cylinder, a transmission mechanism and a fixed tool holder. The pull rod is horizontally and movably arranged on the movable frame; The shearing tool holder is movably arranged inside the movable frame and is located below the pull rod. The shearing tool is fixed to the bottom of the shearing tool holder and the shearing edge faces downward; The shearing hydraulic cylinder is fixed to the movable frame through the cylinder block. The movable end of the piston rod of the shearing hydraulic cylinder is connected to the pull rod; There are at least two groups of transmission mechanisms. Each group of transmission mechanisms includes a vertical rod and two connecting rods. Each group of transmission mechanisms is sequentially arranged on the pull rod and is arranged as follows: The upper part of the vertical rod is sequentially fixed to the movable frame. The inner ends of the two connecting rods are rotatably connected to the pull rod through pins. The outer end of one connecting rod is rotatably connected to the top end of the vertical rod through a pin. The outer end of the other connecting rod is rotatably connected to the shearing tool holder through a pin; The fixed tool holder is fixed inside the movable frame and is located below the shearing tool holder; When the piston rod of the shearing hydraulic cylinder extends or retracts, it pulls the pull rod to move horizontally, and then drives the shearing tool holder and the shearing tool to move vertically through the transmission of the transmission mechanism; The pinch roll assembly includes two pinch rolls, a pinch hydraulic cylinder and a feeding flap. The two pinch rolls are rotatably arranged on one side of the fixed frame. The outer sides of the two pinch rolls face each other and are arranged vertically. One of the pinch rolls is driven to rotate by a driving motor. The space between the outer sides of the two pinch rolls is a conveying channel, and the conveying channel is opposite to the shearing edge of the shearing tool. The cylinder block of the pinch hydraulic cylinder is fixed to the fixed frame. The movable end of the piston rod of the pinch hydraulic cylinder is connected to the upper pinch roll. One end of the feeding flap is rotatably arranged on the fixed frame, and the other end of the feeding flap extends into the movable frame and is also connected to the movable end of the piston rod of the pinch hydraulic cylinder.

[0009] The described link double-layer hydraulic cross-cut shearing machine capable of feeding tail stock and fixed-length pinch feeding is characterized in that: The shearing assembly further includes a detection grating. Two detection gratings are sequentially arranged directly in front of the conveying channel; An encoder is provided on the driving motor of the pinch roll.

[0010] The described link double-layer hydraulic cross-cut shearing machine capable of feeding tail stock and fixed-length pinch feeding is characterized in that: The number of the shearing assemblies and the pinch roll assemblies is equal and at least two.

[0011] The using method of the described link double-layer hydraulic cross-cut shearing machine capable of feeding tail stock and fixed-length pinch feeding is characterized in that: It is sequentially implemented according to the following steps: S1. Initialization: After the leading end of the plate to be sheared is fed in from the lower pinch roll, the piston rod of the pinch cylinder extends to press down the upper pinch roll, so that the two pinch rolls clamp the plate and convey it to the shearing knife through the conveying channel; S2. Shearing: After the plate is conveyed to the shearing knife for a set distance, the pinch rolls pause to temporarily stop the conveyance of the plate. The piston rod of the shearing cylinder extends to push the pull rod to extend horizontally. Through the transmission of the transmission mechanism, that is, the two connecting rods change from the bent state to the straight connection state, driving the shearing knife holder and the shearing knife to move downward in the vertical direction. The shearing knife shears the plate, and the sheared plate slides down to the lower receiving trough under the action of gravity. Subsequently, the piston rod of the shearing cylinder retracts to pull the pull rod to retract horizontally. Through the transmission of the transmission mechanism, that is, the two connecting rods change from the straight connection state to the bent state, driving the shearing knife holder and the shearing knife to move upward in the vertical direction; S3. Repeat: Repeatedly execute step S until the plate is sheared the set number of knives; S4. Ending: If the length of the last piece of tail material after the plate is sheared is less than the distance between the pinch roll and the shearing knife, the tail material cannot slide into the receiving trough by itself and stagnates between the pinch roll and the shearing knife. At this time, the piston rod of the pinch cylinder retracts to lift the feeding flap, so that the tail material falls into the receiving trough; S5. Offline maintenance: The piston rod of the pinch cylinder retracts to lift the upper pinch roll and the feeding flap to avoid the fixed frame window. The piston rod of the frame moving cylinder extends to push the moving frame to move out of the fixed frame along the track to the offline position for maintenance.

[0012] The usage method of the double-link double-layer hydraulic cross-cut shearing machine capable of feeding tail material and fixed-length feeding is characterized in that: it is implemented in the following steps in sequence: S1. Initialization: When the leading end of the plate to be sheared passes through the first detection grating from the lower pinch roll, the encoder of the pinch roll drive motor starts to count. Subsequently, when the leading end of the plate passes through the second detection grating, the piston rod of the pinch cylinder extends to press down the upper pinch roll, so that the two pinch rolls clamp the plate and convey it to the shearing knife through the conveying channel; S2. Shearing: When the encoder of the pinch roll drive motor counts to the set value, at this time the plate is conveyed to the shearing knife for a set distance. The pinch rolls pause to temporarily stop the conveyance of the plate. The piston rod of the shearing cylinder extends to push the pull rod to extend horizontally. Through the transmission of the transmission mechanism, that is, the two connecting rods change from the bent state to the straight connection state, driving the shearing knife holder and the shearing knife to move downward in the vertical direction. The shearing knife shears the plate, and the sheared plate slides down to the lower receiving trough under the action of gravity. Subsequently, the piston rod of the shearing cylinder retracts to pull the pull rod to retract horizontally. Through the transmission of the transmission mechanism, that is, the two connecting rods change from the straight connection state to the bent state, driving the shearing knife holder and the shearing knife to move upward in the vertical direction, and at the same time the encoder of the pinch roll drive motor starts to count again; S3. Repeat: Repeatedly execute step S until the sheet is sheared by the set number of cuts. S4. Ending: If the length of the last piece of offcut after shearing the sheet is less than the distance between the pinch rolls and the shear blade, the offcut cannot slide into the receiving chute by itself and will be stuck between the pinch rolls and the shear blade. At this time, the piston rod of the pinch hydraulic cylinder retracts to lift the feeding flap, so that the offcut falls into the receiving chute. S5. Offline maintenance: The piston rod of the pinch hydraulic cylinder retracts to lift the upper pinch rolls and the feeding flap, avoiding the window of the fixed frame. The piston rod of the frame moving hydraulic cylinder extends to push the moving frame out of the fixed frame along the track to the offline position for maintenance.

[0013] The shearing equipment is usually arranged in the middle of the entrance section of the production line, and the shearing quality has a direct impact on the subsequent welding quality. The present invention adopts the following structure: 1. Adopt a double-layer structure, which is compactly arranged, divided into a moving frame and a fixed frame. The moving frame is equipped with main equipment such as a shear tool holder, a connecting rod, a pull rod, a shear hydraulic cylinder, and a flap. It can be horizontally and integrally moved to the offline area for maintenance through the lower moving hydraulic cylinder.

[0014] 2. The fixed tool holder is below and the shear tool holder is above, and the upper cutting edge is beveled. In the form of a connecting rod, a set of hydraulic cylinders is used to push from top to bottom for cutting outside the unit line, which is called the up-cut type. The shearing action is simple and easy to maintain. In the form of a connecting rod and a pull rod, only one set of oil cylinders can be used to push, and the synchronization is good. The shear hydraulic cylinder is arranged in the offline position, which can avoid the daily leakage of hydraulic oil from polluting the on-line strip steel and equipment. Using only one set of oil cylinders can reduce the equipment piping.

[0015] 3. A pair of pinch rolls are configured at the entrance for pinching the strip steel, and one cut is made each time it is fed forward. The forward feeding length is the length of the sheared scrap plate, and the length can be set in the unit HMI and calculated by counting with the encoder behind the motor.

[0016] 4. Between the cutting edge and the pinch rolls, a set of feeding flaps actuated by cylinders are configured. When cutting the last cut, if the pinch rolls cannot pinch the strip steel, the flap can be turned up to make the last piece of scrap fall into the scrap chute. The flap is also installed on the moving frame, which is small and compact, so that when the flap is retracted, the moving frame can be integrally moved out without interfering with other equipment.

[0017] 5. The shear blade clearance is achieved by adjusting the upper tool holder. A set of jack wedge adjustment devices are used, guided by copper sliders, and the clearance is eliminated by the pressure plate and springs.

[0018] The lower part of the moving frame is equipped with wheels, and the fixed frame is installed with tracks. The moving frame is pushed out and retracted by the moving hydraulic cylinder, and blade replacement and other maintenance work can be carried out in the offline position.

[0019] The present invention has the following beneficial effects: By using the connecting rod shearing, upper shearing method, movable frame, and feeding flap, the four major problems of the original shearing synchronization, pulling and curling, off-line maintenance, and feeding of the last steel plate are effectively solved. The use effect is stable, the maintenance is convenient, the faults are few, and the shearing quality is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the front view of the present invention, Figure 2 is the left view of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] The present invention will be further described below through specific embodiments. Embodiment

[0022] A connecting rod double-layer hydraulic horizontal cutting shear capable of feeding the tail material and feeding and clamping at a fixed length, comprising a fixed frame 1, a movable frame 2, a shearing assembly 3, and a feeding and clamping assembly 4, as Figure 1 and Figure 2 shown, the specific structure is: The fixed frame 1 is fixed on the ground. A track 21 laid from outside the fixed frame 1 to inside the fixed frame 1 is provided at the lower part of the fixed frame 1. The movable frame 2 is movably arranged on the track 21 through rollers at the bottom. A frame moving hydraulic cylinder 22 is further provided at the bottom of the fixed frame 1, and the movable end of the piston rod of the frame moving hydraulic cylinder 22 is connected to the movable frame 2; The shearing assembly 3 includes a pull rod 31, a shearing tool holder 32, a shearing tool 33, a shearing hydraulic cylinder 34, a transmission mechanism 35, and a fixed tool holder 36, The pull rod 31 is horizontally and movably arranged on the movable frame 2; The shearing tool holder 32 is movably arranged inside the movable frame 2 and is located below the pull rod 31. The shearing tool 33 is fixed at the bottom of the shearing tool holder 32 and the shearing edge faces downward; The shearing hydraulic cylinder 34 is fixed on the movable frame 2 through the cylinder body, and the movable end of the piston rod of the shearing hydraulic cylinder 34 is connected to the pull rod 31; There are at least two groups of the transmission mechanism 35. Each group of the transmission mechanism 35 includes a vertical rod 351 and two connecting rods 352. Each group of the transmission mechanism 35 is sequentially arranged on the pull rod 31 and is arranged as follows: the upper part of the vertical rod 351 is sequentially fixed on the movable frame 2, the inner ends of the two connecting rods 352 are rotatably connected to the pull rod 31 through pins, the outer end of one connecting rod 352 is rotatably connected to the top end of the vertical rod 351 through a pin, and the outer end of the other connecting rod 352 is rotatably connected to the shearing tool holder 32 through a pin; The fixed tool holder 36 is fixed inside the movable frame 2 and is located below the shearing tool holder 32; When the piston rod of the shearing hydraulic cylinder 34 extends or retracts, the traction rod 31 moves horizontally, and then drives the shearing tool rest 32 and the shearing tool 33 to move vertically through the transmission of the transmission mechanism 35; The feeding component 4 includes two feeding rollers 41, a feeding hydraulic cylinder 43 and a feeding flap 44. The two feeding rollers 41 are rotatably arranged on one side of the fixed frame 1. The outer sides of the two feeding rollers 41 face each other and are arranged vertically. One of the feeding rollers 41 is driven to rotate by a driving motor. The space between the outer sides of the two feeding rollers 41 is a conveying channel 42. The conveying channel 42 faces the shearing edge of the shearing tool 33. The cylinder body of the feeding hydraulic cylinder 43 is fixed on the fixed frame 1. The moving end of the piston rod of the feeding hydraulic cylinder 43 is connected to the upper feeding roller 41. One end of the feeding flap 44 is rotatably arranged on the fixed frame 1, and the other end of the feeding flap 44 extends into the moving frame 2 and is also connected to the moving end of the piston rod of the feeding hydraulic cylinder 43.

[0023] In this embodiment, the shearing assembly 3 further includes a detection grating 37. Two detection gratings 37 are sequentially arranged directly in front of the conveying channel 42; an encoder is provided on the driving motor of the feeding roller 41.

[0024] In this embodiment: The number of the shearing assemblies 3 and the feeding assemblies 4 is equal and both are two.

[0025] When this embodiment is used, it is implemented in the following steps in sequence: S1. Initialization: When the leading end of the plate 5 to be sheared passes through the first detection grating 37 from below the lower feeding roller 41, the encoder of the driving motor of the feeding roller 41 starts to count. Subsequently, when the leading end of the plate 5 passes through the second detection grating 37, the piston rod of the feeding hydraulic cylinder 43 extends to press down the upper feeding roller 41, so that the two feeding rollers 41 clamp the plate 5 and convey it to the shearing tool 33 through the conveying channel 42; S2. Shearing: When the encoder of the driving motor of the feeding roller 41 counts to the set value, at this time the plate 5 has been conveyed a set distance to the shearing tool 33. The feeding roller 41 pauses to rotate to temporarily stop the conveyance of the plate 5. The piston rod of the shearing hydraulic cylinder 34 extends to push the pull rod 31 to extend horizontally. Through the transmission of the transmission mechanism 35, that is, the two connecting rods 352 change from the bent state to the straight connection state, driving the shearing tool rest 32 and the shearing tool 33 to move downward vertically. The shearing tool 33 shears the plate 5. The sheared plate 5 slides down to the lower material receiving groove under the action of gravity. Subsequently, the piston rod of the shearing hydraulic cylinder 34 retracts to pull the pull rod 31 to retract horizontally. Through the transmission of the transmission mechanism 35, that is, the two connecting rods 352 change from the straight connection state to the bent state, driving the shearing tool rest 32 and the shearing tool 33 to move upward vertically. At the same time, the encoder of the driving motor of the feeding roller 41 starts to count again; S3. Repeat: Repeatedly execute step S2 until the plate 5 is sheared the set number of knives; S4. Ending: If the length of the last piece of scrap cut from the sheet 5 is less than the distance between the pinch roll 41 and the shear blade 33, the scrap cannot slide into the receiving chute by itself and will be stuck between the pinch roll 41 and the shear blade 33. At this time, the piston rod of the pinch hydraulic cylinder 43 retracts to lift the feeding flap 44, so that the scrap falls into the receiving chute; S5. Offline maintenance: The piston rod of the pinch hydraulic cylinder 43 retracts to lift the upper pinch roll 41 and the feeding flap 44 to avoid the window of the fixed frame 1. The piston rod of the frame moving hydraulic cylinder 22 extends to push the moving frame 2 out of the fixed frame 1 along the track 21 to the offline position for maintenance.

Claims

1. A connecting rod double-layer hydraulic cross-cutting shear capable of feeding tailings and clamping fixed lengths, comprising a fixed frame (1) and a movable frame (2), characterized in that: It also includes a shearing component (3) and a pinching component (4), The fixed frame (1) is fixed on the ground, and a track (21) is provided at the bottom of the fixed frame (1) and is laid from the outside of the fixed frame (1) to the inside of the fixed frame (1). The mobile frame (2) is movably arranged on the track (21) via rollers at the bottom. A frame moving hydraulic cylinder (22) is also provided at the bottom of the fixed frame (1), and the moving end of the piston rod of the frame moving hydraulic cylinder (22) is connected to the mobile frame (2); The shearing assembly (3) comprises a pull rod (31), a shearing tool holder (32), a shearing knife (33), a shearing hydraulic cylinder (34), a transmission mechanism (35) and a fixed tool holder (36). The pull rod (31) is horizontally and movably arranged on the movable frame (2); The shearing knife frame (32) is movably arranged in the movable frame (2) and is located below the pull rod (31); the shearing knife (33) is fixed at the bottom of the shearing knife frame (32) and the shearing blade faces downward; The shearing hydraulic cylinder (34) is fixed on the movable frame (2) through a cylinder body, and the movable end of the piston rod of the shearing hydraulic cylinder (34) is connected to the pull rod (31); There are at least two groups of transmission mechanisms (35), each group of transmission mechanisms (35) includes a vertical rod (351) and two connecting rods (352), and each group of transmission mechanisms (35) is arranged on the pull rod (31) in sequence and is arranged as follows: the upper part of the vertical rod (351) is fixed on the movable frame (2) in sequence, the inner ends of the two connecting rods (352) are rotatably connected to the pull rod (31) through a pin shaft, the outer end of one connecting rod (352) is rotatably connected to the top of the vertical rod (351) through a pin shaft, and the outer end of the other connecting rod (352) is rotatably connected to the shearing tool holder (32) through a pin shaft; The fixed knife frame (36) is fixed in the movable frame (2) and is located below the shearing knife frame (32); When the piston rod of the shear hydraulic cylinder (34) is extended or retracted, the traction rod (31) moves in the horizontal direction, and then the shear knife holder (32) and the shear knife (33) are driven to move in the vertical direction through the transmission mechanism (35); The clamping assembly (4) comprises two clamping rollers (41), a clamping hydraulic cylinder (43) and a feeding flap (44). The two clamping rollers (41) are rotatably arranged on one side of the fixed frame (1). The outer side surfaces of the two clamping rollers (41) face each other and are arranged up and down. One of the clamping rollers (41) is driven to rotate by a driving motor. A conveying channel (42) is provided between the outer side surfaces of the two clamping rollers (41). The conveying channel (42) faces the shearing edge of the shearing knife (33). The cylinder body of the clamping hydraulic cylinder (43) is fixed on the fixed frame (1). The movable end of the piston rod of the clamping hydraulic cylinder (43) is connected to the clamping roller (41) located above. One end of the feeding flap (44) is rotatably arranged on the fixed frame (1). The other end of the feeding flap (44) extends into the movable frame (2) and is also connected to the movable end of the piston rod of the clamping hydraulic cylinder (43).

2. The connecting rod double-layer hydraulic cross-cutting shear capable of feeding tail material and clamping and feeding fixed length as claimed in claim 1, characterized in that: The shearing assembly (3) further comprises a detection grating (37), and two detection gratings (37) are sequentially arranged in front of the conveying channel (42); an encoder is arranged on the driving motor of the pinch roller (41).

3. The connecting rod double-layer hydraulic cross-cutting shear capable of feeding tail material and clamping and feeding fixed length as claimed in claim 2, characterized in that: The number of the shearing components (3) and the pinching components (4) is equal and at least two.

4. The method for using the connecting rod double-layer hydraulic cross-cutting shear capable of feeding tail material and fixed-length clamping according to any one of claims 1 to 3, characterized in that: Follow the steps below to implement: S1. Initialization: After the leading edge of the sheet (5) to be sheared is input from the lower pinch roller (41), the piston rod of the pinch hydraulic cylinder (43) extends to press the upper pinch roller (41) downward, so that the two pinch rollers (41) clamp the sheet (5) and transport it to the shearing knife (33) through the conveying channel (42); S2. Shearing: After the plate (5) is conveyed to the shearing knife (33) for a set distance, the pinch roller (41) stops rotating to temporarily stop conveying the plate (5), and the piston rod of the shearing hydraulic cylinder (34) extends to push the pull rod (31) to extend in the horizontal direction. Through the transmission of the transmission mechanism (35), the two connecting rods (352) are transformed from a bent state to a straight-line connection state, driving the shearing knife holder (32) and the shearing knife (33) to move downward in the vertical direction. The shearing knife (33) shears the plate (5), and the sheared plate (5) slides down to the receiving trough below under the action of gravity. Then, the piston rod of the shearing hydraulic cylinder (34) retracts to pull the pull rod (31) back in the horizontal direction. Through the transmission of the transmission mechanism (35), the two connecting rods (352) are transformed from a straight-line connection state to a bent state, driving the shearing knife holder (32) and the shearing knife (33) to move upward in the vertical direction. S3 repeat: Repeat step S2 until the sheet (5) is cut to the set number of cutters; S4. Ending: If the length of the last piece of tail material cut from the plate (5) is less than the distance between the pinch roller (41) and the shearing knife (33), the tail material cannot slide down to the receiving trough by itself and stagnates between the pinch roller (41) and the shearing knife (33). At this time, the piston rod of the pinch hydraulic cylinder (43) retracts to lift the feeding flap (44), so that the tail material falls into the receiving trough; S5. Offline maintenance: The piston rod of the pinch hydraulic cylinder (43) retracts to lift the upper pinch roller (41) and the feeding flap (44) away from the window of the fixed frame (1). The piston rod of the frame moving hydraulic cylinder (22) extends to push the moving frame (2) along the track (21) out of the fixed frame (1) to the offline position for maintenance.

5. The method for using the connecting rod double-layer hydraulic cross-cutting shear capable of delivering tail material and fixed-length clamping as claimed in claim 2 or 3, characterized in that: Follow the steps below to implement: S1. Initialization: When the leading edge of the sheet (5) to be sheared passes through the first detection grating (37) on the lower pinch roller (41), the encoder of the driving motor of the pinch roller (41) starts counting, and then when the leading edge of the sheet (5) passes through the second detection grating (37), the piston rod of the pinch hydraulic cylinder (43) extends to press down the upper pinch roller (41), so that the two pinch rollers (41) clamp the sheet (5) and convey it to the shearing knife (33) through the conveying channel (42); S2. Shearing: When the encoder of the driving motor of the pinch roller (41) counts to the set value, the plate (5) is transported to the shearing knife (33) by the set distance, the pinch roller (41) stops rotating to temporarily stop the transport of the plate (5), the piston rod of the shearing hydraulic cylinder (34) extends to push the pull rod (31) in the horizontal direction, and through the transmission of the transmission mechanism (35), the two connecting rods (352) are turned from the bent state to the straight connection state, driving the shearing knife frame (32) and the shearing knife (33) in the vertical direction. The shearing knife (33) shears the plate (5), and the sheared plate (5) slides down to the receiving trough below under the action of gravity. Then, the piston rod of the shearing hydraulic cylinder (34) retracts and pulls the pull rod (31) back in the horizontal direction. Through the transmission of the transmission mechanism (35), the two connecting rods (352) are changed from a straight connection state to a bent state, driving the shearing knife frame (32) and the shearing knife (33) to move upward in the vertical direction. At the same time, the encoder of the driving motor of the pinch roller (41) starts counting again. S3 repeat: Repeat step S2 until the sheet (5) is cut to the set number of cutters; S4. Ending: If the length of the last piece of tail material cut from the plate (5) is less than the distance between the pinch roller (41) and the shearing knife (33), the tail material cannot slide down to the receiving trough by itself and stagnates between the pinch roller (41) and the shearing knife (33). At this time, the piston rod of the pinch hydraulic cylinder (43) retracts to lift the feeding flap (44), so that the tail material falls into the receiving trough; S5. Offline maintenance: The piston rod of the pinch hydraulic cylinder (43) retracts to lift the upper pinch roller (41) and the feeding flap (44) away from the window of the fixed frame (1). The piston rod of the frame moving hydraulic cylinder (22) extends to push the moving frame (2) along the track (21) out of the fixed frame (1) to the offline position for maintenance.

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