Large-opening-degree crop shear and using method thereof

Abstract

The invention belongs to the technical field of hot-rolled and cold-rolled plate strips, and particularly relates to a large-opening-degree crop shear and a using method thereof. A pair of large-opening-degree crop shears comprises a rack, an upper tool apron and a lower tool apron, a lower shear blade is fixedly connected to the lower tool apron, an upper shear blade is fixedly connected to the upper tool apron, a copper sliding plate is arranged on the lower tool apron, guide grooves are formed in the two sides of the rack, the copper sliding plate is connected with the guide grooves in a sliding mode, connecting holes are formed in the two sides of the lower tool apron respectively, and copper sleeves and guide rods are installed in the connecting holes. The upper tool apron is fixed to the top of the guide rod, the bottom of the guide rod is connected with a movable oil cylinder base, shearing oil cylinders are arranged on the two sides of the movable oil cylinder base respectively, the upper portions of the shearing oil cylinders are connected with a lower tool apron, a check block is arranged in a guide groove of the rack, and the rack is provided with a spigot below the lower tool apron. Movement of the upper shear blade and the lower shear blade is achieved through stretching and retracting of a set of oil cylinders, the shear blade opening degree is large, and the shearing device is suitable for a hot-rolled plate strip production unit with irregular strip heads and is easy to operate, high in practicability and high in working efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hot-rolled and cold-rolled strip, and particularly relates to a large-opening-degree head-cutting shear and a use method thereof. BACKGROUND

[0002] In a hot-rolled and cold-rolled strip production unit, such as a hot-rolled preparation station, a cold-rolled inspection station, a continuous annealing, galvanizing and finishing unit, a head-cutting shear is often arranged at an inlet section for cutting irregular strip heads. The head-cutting shear generally has an upper-cutting type head-cutting shear, i.e. an upper shear blade is fixed, and a lower shear blade can run from bottom to top for shearing. In addition, there is also a lower-cutting type head-cutting shear, i.e. a lower shear blade is fixed, and an upper shear blade can run from top to bottom for shearing. Regardless of the upper-cutting type head-cutting shear or the lower-cutting type head-cutting shear, the height of the fixed shear blade determines the height of the shearing operation surface. The height difference between the shearing operation surface and the operation surface of the unit is generally controlled within the range of 30-50 mm. If the height difference is further increased, it will bring other adverse effects. Therefore, the fixed shear blade is generally not far away from the operation surface of the unit. The strip is not under tension when it is being fed, and the support point has a large span. Therefore, the sag of the relaxed strip is large, and it can contact the lower shear blade. In particular, the head of the hot-rolled coil is irregular, and it has a serious head-warping or head-drooping. During the feeding process, it can contact the upper shear blade or the lower shear blade. SUMMARY

[0003] In view of the above problems, the present application aims to provide a large-opening-degree head-cutting shear and a use method thereof. The movement of the upper shear blade and the lower shear blade of the head-cutting shear is realized by the extension and retraction of a group of oil cylinders. The shear blade has a large opening degree, and it is particularly suitable for a hot-rolled coil strip production unit with irregular heads. The head-cutting shear has the advantages of a large shear blade opening degree, single-acting oil cylinder for upper and lower shearing, simple operation, strong practicability and high working efficiency.

[0004] The technical scheme of the present application is as follows: a large-opening-degree head-cutting shear, comprising a rack, an upper knife seat and a lower knife seat. The lower knife seat is fixedly connected with a lower shear blade. The upper knife seat is arranged directly above the lower knife seat. The upper knife seat is fixedly connected with an upper shear blade. Copper sliding plates are arranged on the left and right sides of the front and rear surfaces of the lower knife seat. Guide grooves are arranged on the two sides of the rack. The copper sliding plates are slidably connected with the guide grooves. The lower knife seat is H-shaped. Connection holes are arranged on the two sides of the lower knife seat. Copper sleeves are installed in the connection holes in an interference fit. Guide rods are installed in the copper sleeves in a clearance fit. The upper knife seat is fixed on the top of the guide rods. A movable oil cylinder seat is connected with the bottom of the guide rods. Shearing oil cylinders are arranged between the guide rods on the two sides of the movable oil cylinder seat. The output end of the upper shear blade is connected with the lower knife seat. A stop block is arranged in the guide groove of the rack between the lower knife seat and the upper knife seat. A stop is arranged below the lower knife seat. When the output end of the shearing oil cylinder is in a retracted state, the lower shear blade is at a lower limit position, the upper shear blade is at an upper limit position, the top surface of the movable oil cylinder seat is in contact with the bottom surface of the lower knife seat, and the outer extension of the bottom surface of the lower knife seat is in contact with the stop of the rack.

[0005] The guide rod comprises a first threaded stud, a first stepped surface, a rack, a second stepped surface and a second threaded stud from bottom to top, the top surface of the movable oil cylinder seat is attached to the first stepped surface, the bottom surface of the upper knife seat is attached to the second stepped surface, nuts are respectively arranged on the first threaded stud and the second threaded stud, and the movable oil cylinder seat and the upper knife seat are respectively fixed on the guide rod through the nuts.

[0006] A synchronous shaft is further arranged on the lower knife seat, synchronous gears are respectively arranged at two ends of the synchronous shaft, and the synchronous gears are engaged with the rack.

[0007] The lower shear blade is bolted on the lower knife seat, and the upper shear blade is bolted on the upper knife seat.

[0008] A bumper is arranged on the upper knife seat.

[0009] A use method of the large-opening-degree cut-off shear, using the large-opening-degree cut-off shear as described above, comprises the following steps: Step one: the output end of the shearing oil cylinder is retracted, the lower shear blade is at a lower limit position, and the upper shear blade is at an upper limit position; Step two: the strip is run forward by 500-800 mm to enter a shearing station between the lower shear blade and the upper shear blade; Step three: high-pressure oil is supplied to a rodless cavity of the shearing oil cylinder, the lower shear blade has an upward trend, because the self-weights of the lower knife seat, the lower shear blade, the two shearing oil cylinders and the movable oil cylinder seat are greater than the self-weights of the upper knife seat and the upper shear blade, therefore, at the beginning, the extended part of the bottom surface of the lower knife seat is attached to a stopper of a rack, with the continuous supply of high-pressure oil, the lower shear blade rises, the movable oil cylinder seat moves downward synchronously, the lower knife seat drives the guide rod to move downward, thereby driving the upper shear blade to move downward, when the bumper on the upper knife seat hits the stopper and falls by 30 mm, the upper shear blade stops falling, and the falling distance is S2; Step four: the high-pressure oil is continuously supplied to the rodless cavity of the shearing oil cylinder, the shearing oil cylinder continuously runs through the remaining stroke, the lower shear blade continuously rises, the rising distance is S1, and the shearing of the strip head is completed, the stroke of the oil cylinder is S1+S2, and S1>S2; Step five: high-pressure oil is supplied to a rod cavity of the shearing oil cylinder, under the action of the guide rod, the upper shear blade has a downward trend, because the self-weights of the lower knife seat, the lower shear blade, the two shearing oil cylinders and the movable oil cylinder seat are greater than the self-weights of the upper knife seat and the upper shear blade, therefore, at the beginning, the bumper on the upper knife seat is always in contact with the stopper, only the lower shear blade falls, when the falling distance is S1, the extended part of the bottom surface of the lower knife seat is attached to the stopper of the rack, and the lower shear blade returns to the lower limit position, Step six: continue to supply high pressure oil to the rod cavity of the oil cylinder, the oil cylinder continues to run through the remaining stroke, the upper shear blade starts to rise, the rising distance is S2, the oil cylinder stroke is run through, the upper shear blade returns to the upper limit position, and the shearing operation is completed.

[0010] The technical effect of the present application is: 1. The movement of the upper shear blade and the lower shear blade is realized by the extension and contraction of a group of shearing oil cylinders, the shear blade opening degree is large, and the present application is particularly suitable for hot rolled coil strip production unit with irregular head, has the advantages of large shear blade opening degree, single-acting oil cylinder for upper and lower shearing, simple operation, strong practicability and high working efficiency. 2. The lower knife seat is provided with a synchronous shaft and a synchronous gear, the synchronous gear is engaged with the rack on the guide rod, when the lower shear blade rises, the movable oil cylinder seat moves downward synchronously, and then drives the guide rod to move downward, thereby driving the upper shear blade to move downward, when the lower shear blade falls, the movable oil cylinder seat moves upward synchronously, and then drives the guide rod to move upward, thereby driving the upper shear blade to move upward.

[0011] The following will be further described with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structural schematic view of a large opening degree head cutting shear of the present application.

[0013] Figure 2 is the A-A sectional view of the present application. Figure 1

[0014] Figure 3 is the B-B sectional view of the present application. Figure 1

[0015] Figure 4 is a schematic view of the guide rod of the present application.

[0016] The drawings show: 1-movable oil cylinder seat; 2-shearing oil cylinder; 3-copper sleeve; 4-guide rod; 41-first stud; 42-first step surface; 43-rack; 44-second step surface; 45-second stud; 5-lower shear blade; 6-machine frame; 61-stop; 7-stop block; 8-buffer; 9-nut; 10-upper knife seat; 11-upper shear blade; 12-lower knife seat; 13-synchronous shaft; 14-synchronous gear; 15-copper sliding plate; 16-plate strip. DETAILED DESCRIPTION Example 1

[0017] As Figures 1-3 ​​As shown, a large-aperture cutting head shear includes a frame 6, an upper blade holder 10, and a lower blade holder 12. A lower cutting blade 5 is fixedly connected to the lower blade holder 12. The upper blade holder 10 is located directly above the lower blade holder 12, and an upper cutting blade 11 is fixedly connected to the upper blade holder 10. Copper sliding plates 15 are respectively provided on the left and right sides of the front and rear sides of the lower blade holder 12. Guide grooves are provided on both sides of the frame 6, and the copper sliding plates 15 are slidably connected to the guide grooves. The lower blade holder 12 is H-shaped, and connecting holes are provided on both sides of the lower blade holder 12. A copper sleeve 3 is installed in the connecting hole with an interference fit, and a guide rod 4 is installed in the copper sleeve 3 with a clearance fit. The upper blade holder 10 is fixedly connected to the upper blade holder 12. The guide rod 4 is fixed at the top, and the bottom of the guide rod 4 is connected to the movable cylinder seat 1. The two guide rods 4 on both sides of the movable cylinder seat 1 are respectively provided with shearing cylinders 2. The output end of the upper part of the shearing cylinder 2 is connected to the lower blade seat 12. The guide groove of the frame 6 between the lower blade seat 12 and the upper blade seat 10 is provided with a stop block 7. The frame 6 is provided with a stop 61 below the lower blade seat 12. When the output end of the shearing cylinder 2 is in the retracted state, the lower shear blade 5 is at the lower limit position, the upper shear blade 11 is at the upper limit position, the top surface of the movable cylinder seat 1 is in contact with the bottom surface of the lower blade seat 12, and the outer extension of the bottom surface of the lower blade seat 12 is in contact with the stop 61 of the frame 6.

[0018] In this invention, before shearing the strip, the lower shear blade is at its lower limit position and the upper shear blade is at its upper limit position to achieve the maximum shear blade opening, facilitating the passage of irregular strip ends. After the strip end has passed through, when it is necessary to cut the end, the lower shear blade rises to the shearing height, and the shearing cylinder continues to operate, pulling the upper shear blade downwards to shear the strip. The shearing cylinder then reverses its operation, raising the upper shear blade to its upper limit position and lowering the lower shear blade to its lower limit position, awaiting the next shearing. This invention is suitable for strip production units that require strip end cutting, especially for hot-rolled coil strip production units with irregular strip ends. It has the advantages of a large shear blade opening, single-acting cylinder for vertical shearing, simple operation, strong practicality, and high working efficiency. Example 2

[0019] Based on Example 1, in this example, preferably, as follows: Figure 4 As shown, the guide rod 4 includes a first stud 41, a first stepped surface 42, a rack 43, a second stepped surface 44, and a second stud 45 from bottom to top. The top surface of the movable cylinder seat 1 is in contact with the first stepped surface 42, and the bottom surface of the upper tool holder 10 is in contact with the second stepped surface 44. Nuts 9 are respectively provided on the first stud 41 and the second stud 45. The movable cylinder seat 1 and the upper tool holder 10 are respectively fixed to the guide rod 4 by the nuts 9.

[0020] In use of the present application, the top surface of the movable oil cylinder seat 1 is attached to the first step surface 42, the bottom surface of the upper knife seat 10 is attached to the second step surface 44, nuts 9 are respectively arranged on the first threaded column 41 and the second threaded column 45, in installation, the bottom surface of the upper knife seat 10 is attached to the second step surface 44 of the guide rod 4, the nut 9 is screwed on the second threaded column 45 of the guide rod 4, and then the upper knife seat 10 is fixed on the guide rod 4, the top surface of the movable oil cylinder seat 1 is attached to the first step surface 42 of the guide rod 4, the nut 9 is screwed on the first threaded column 41 of the guide rod 4, and then the movable oil cylinder seat 1 is fixed on the guide rod 4. Example 3

[0021] In the present embodiment based on example 1 or example 2, preferably, the lower knife seat 12 is further provided with a synchronous shaft 13, the synchronous shaft 13 is provided with synchronous gears 14 at both ends, and the synchronous gears 14 are engaged with the rack 43.

[0022] In use of the present application, the guide rod 4 is provided with the rack 43, the lower knife seat 12 provided with the synchronous shaft 13 and the synchronous gears 14 is engaged with the rack 43 during lifting, and the synchronous gears 14 and the rack 43 are engaged to play a synchronous role. Example 4

[0023] In the present embodiment based on example 1 or example 3, preferably, the lower shear blade 5 is bolted on the lower knife seat 12, and the upper shear blade 11 is bolted on the upper knife seat 10.

[0024] In use of the present application, the lower shear blade 5 is bolted on the lower knife seat 12, and the upper shear blade 11 is bolted on the upper knife seat 10, which is installed by bolts, and is fast and convenient. Example 5

[0025] In the present embodiment based on example 1 or example 4, preferably, the upper knife seat 10 is provided with a buffer 8.

[0026] In use of the present application, the upper knife seat 10 is provided with the buffer 8, the buffer 8 is installed on the upper knife seat 10, and the upper shear blade 11 plays a buffering role when shearing the plate strip downward. Example 6

[0027] A use method of the large-opening-degree head cutting shear, using the large-opening-degree head cutting shear as described above, comprising the following steps: Step one: the output end of the shearing oil cylinder 2 is retracted, the lower shear blade 5 is at the lower limit position, and the upper shear blade 11 is at the upper limit position; Step two: the plate strip 16 runs forward by 500-800 mm to enter the shearing position between the lower shear blade 5 and the upper shear blade 11; Step three: high pressure oil is passed through the rodless cavity of the oil cylinder 2, the lower blade 5 has an upward trend, because the self-weight of the lower blade seat 12, the lower blade 5, the two oil cylinders 2 and the movable oil cylinder seat 1 is greater than the self-weight of the upper blade seat 10 and the upper blade 11, therefore, at the beginning, the extended part of the bottom surface of the lower blade seat 12 is attached to the stopper 61 of the frame 6, with the continuous passing of high pressure oil, the lower blade 5 rises, the movable oil cylinder seat 1 moves downward synchronously, the lower blade seat 12 drives the guide rod 4 to move downward, thereby driving the upper blade 11 to move downward, when the buffer 8 on the upper blade seat 10 hits the stopper 7 and drops by 30mm, the upper blade 11 stops descending, and the descending distance is S2; Step four: the rodless cavity of the oil cylinder 2 continues to pass high pressure oil, the oil cylinder 2 continues to run through the remaining stroke, the lower blade 5 continues to rise, the rising distance is S1, and the shearing of the head of the strip 16 is completed, the stroke of the oil cylinder is S1+S2, and S1>S2; Step five: high pressure oil is passed through the rod cavity of the oil cylinder 2, under the action of the guide rod 4, the upper blade 11 has a tendency to move upward, because the self-weight of the lower blade seat 12, the lower blade 5, the two oil cylinders 2 and the movable oil cylinder seat 1 is greater than the self-weight of the upper blade seat 10 and the upper blade 11, therefore, at the beginning, the buffer 8 on the upper blade seat 10 is always in contact with the stopper 7, only when the lower blade 5 descends by a distance of S1, the extended part of the bottom surface of the lower blade seat 12 is attached to the stopper 61 of the frame 6, and the lower blade 5 returns to the lower limit position, Step six: the rod cavity of the oil cylinder 2 continues to pass high pressure oil, the oil cylinder 2 continues to run through the remaining stroke, the upper blade 11 starts to rise, the rising distance is S2, the oil cylinder 2 runs through the stroke, the upper blade 11 returns to the upper limit position, and one shearing operation is completed.

[0028] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited to this, any changes or replacements within the technical range disclosed by the present application can be easily thought by those skilled in the art, and should be covered within the protection scope of the present application.

Claims

1. A large-opening crop shear characterized by: The assembly includes a frame (6), an upper cutter holder (10), and a lower cutter holder (12). A lower shear blade (5) is fixedly connected to the lower cutter holder (12). The upper cutter holder (10) is located directly above the lower cutter holder (12). An upper shear blade (11) is fixedly connected to the upper cutter holder (10). Copper sliding plates (15) are provided on the left and right sides of the front and rear sides of the lower cutter holder (12). Guide grooves are provided on both sides of the frame (6). The copper sliding plates (15) are slidably connected to the guide grooves. The lower cutter holder (12) is H-shaped. Connecting holes are provided on both sides of the lower cutter holder (12). A copper sleeve (3) is installed in the connecting hole with an interference fit. A guide rod (4) is installed in the copper sleeve (3) with a clearance fit. The upper cutter holder (10) is fixed to the top of the guide rod (4). The bottom of the guide rod (4) is connected to the movable cylinder seat (1). The movable cylinder seat (1) is provided with shearing cylinders (2) between the guide rods (4) on both sides. The output end of the shearing cylinder (2) is connected to the lower blade seat (12). The guide groove of the frame (6) between the lower blade seat (12) and the upper blade seat (10) is provided with a stop (7). The frame (6) is provided with a stop (61) below the lower blade seat (12). When the output end of the shearing cylinder (2) is in the contracted state, the lower shear blade (5) is at the lower limit position and the upper shear blade (11) is at the upper limit position. The top surface of the movable cylinder seat (1) is in contact with the bottom surface of the lower blade seat (12). The outer extension of the bottom surface of the lower blade seat (12) is in contact with the stop (61) of the frame (6).

2. The large opening degree cutting head shear according to claim 1, characterized in that: The guide rod (4) includes, from bottom to top, a first stud (41), a first stepped surface (42), a rack (43), a second stepped surface (44), and a second stud (45). The top surface of the movable cylinder seat (1) is in contact with the first stepped surface (42), and the bottom surface of the upper tool holder (10) is in contact with the second stepped surface (44). Nuts (9) are provided on the first stud (41) and the second stud (45). The movable cylinder seat (1) and the upper tool holder (10) are fixed to the guide rod (4) by nuts (9).

3. The large opening degree cutting head shear according to claim 2, characterized in that: The lower tool holder (12) is also provided with a synchronous shaft (13), and synchronous gears (14) are provided at both ends of the synchronous shaft (13), and the synchronous gears (14) mesh with the rack (43).

4. The large opening degree cutting head shear according to claim 1, characterized in that: The lower shear blade (5) is bolted to the lower blade holder (12), and the upper shear blade (11) is bolted to the upper blade holder (10).

5. The large opening cutting head shear according to claim 1, wherein: The upper tool holder (10) is equipped with a buffer (8).

6. A method of using a large opening crop shear as defined in claim 1, wherein: Includes the following steps: Step 1: The output end of the shearing cylinder (2) retracts, the lower shear blade (5) is at the lower limit position, and the upper shear blade (11) is at the upper limit position; Step 2: The strip (16) moves forward 500~800mm and enters the shearing station between the lower shear blade (5) and the upper shear blade (11); Step three: high pressure oil is passed through the rodless cavity of the oil cylinder (2), the lower blade (5) has an upward trend, because the self-weight of the lower knife holder (12), the lower blade (5), the two oil cylinders (2) and the movable oil cylinder holder (1) is greater than the self-weight of the upper knife holder (10) and the upper blade (11), so at the beginning, the extended part of the bottom surface of the lower knife holder (12) is attached to the stop opening (61) of the rack (6), as the high pressure oil continues to be passed in, the lower blade (5) rises, the movable oil cylinder holder (1) moves downward synchronously, the lower knife holder (12) drives the guide rod (4) to move downward, thereby driving the upper blade (11) to move downward, when the buffer (8) on the upper knife holder (10) hits the stop block (7) and descends by 30mm, the upper blade (11) stops descending, and the descending distance is S2; Step four: the rodless cavity of the oil cylinder (2) continues to pass high pressure oil, the oil cylinder (2) continues to complete the remaining stroke, the lower blade (5) continues to rise, the rising distance is S1, and the shearing of the head of the strip (16) is completed, the stroke of the oil cylinder is S1+S2, and S1>S2; Step five: high pressure oil is passed through the rod cavity of the oil cylinder (2), under the action of the guide rod (4), the upper blade (11) has a tendency to move upward, because the self-weight of the lower knife holder (12), the lower blade (5), the two oil cylinders (2) and the movable oil cylinder holder (1) is greater than the self-weight of the upper knife holder (10) and the upper blade (11), so at the beginning, the buffer (8) on the upper knife holder (10) is always in contact with the stop block (7), only the lower blade (5) is descending, when the descending distance is S1, the extended part of the bottom surface of the lower knife holder (12) is attached to the stop opening (61) of the rack (6), and the lower blade (5) returns to the lower limit position, Step six: the rod cavity of the oil cylinder (2) continues to pass high pressure oil, the oil cylinder (2) continues to complete the remaining stroke, the upper blade (11) starts to rise, the rising distance is S2, the oil cylinder (2) completes the stroke, the upper blade (11) returns to the upper limit position, and one shearing operation is completed.

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