Hydraulic driven metal plate rolling shear

Abstract

The present application belongs to the field of plate shearing, and relates to a hydraulic drive metal plate rolling shearing machine, which comprises a hydraulic rolling shearing body, a shearing blade gap adjusting device, a swing roller way, a pressing oil cylinder and a quick tool changing device; the hydraulic rolling shearing body adopts a double-hydraulic-cylinder differential sequence driving mode to realize the rolling shearing movement of the shearing blade; the shearing blade gap adjusting device adjusts the shearing blade gap according to the requirement of the plate thickness, and can correct the non-parallelism between the upper and lower shearing blades; the swing roller way is used for tool changing action to avoid the bending deformation of the head of the plate, and to reduce the additional pressure of the shearing force transmitted to the roller way through the plate; the pressing oil cylinder is arranged at the inlet side of the plate and in front of the upper shearing blade to ensure that the plate on the non-shearing side is close to the lower tool table during shearing, and to balance the tilting moment. The hydraulic drive metal plate rolling shearing machine has the advantages of large labor-saving ratio and adjustable shearing trajectory according to the plate thickness, and is a high-efficiency integrated equipment for high-quality automatic shearing of wide, thick, high-strength and hot-state plates.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of plate shearing, and particularly relates to a hydraulic drive metal plate rolling shearing machine. BACKGROUND

[0002] With the development of national economy, the production line of steel is continuously upgraded, and the production thickness and width of the plate are continuously improved. At the same time, the mechanical properties of high value-added special steel such as super strong steel, wear-resistant steel and stainless steel are continuously broken through, and the shearing capacity, shearing section quality and intelligent degree of large wide and thick plate shearing equipment are continuously improved. As the main production equipment for cold and hot plate shearing, the rolling shear realizes the rolling movement of the near-arc cutter by controlling the time sequence movement of the connecting rod mechanism, and eliminates the "overlapping amount" of the shear blade, that is, the overstroke of the shear blade forced to advance after reaching the theoretical coincidence degree due to the geometric relationship; and further weakens the plate shearing process, the collapse phenomenon of the broken section of the plate caused by the over-lapping amount of the shear blade, and realizes the high-quality shearing of high-strength and high-toughness plate through reasonable curve trajectory planning, shear blade gap and shear speed matching.

[0003] The existing rolling shear is mainly in the form of mechanical rolling, and the double-shaft double-eccentric type of German SMS company and the single-shaft double-eccentric type independently developed by Taiyuan University of Science and Technology are the main representatives. In the face of the industrial upgrading of high-strength and high-toughness plate, the demand for improving the shearing capacity of the rolling shear is urgent. Due to the inherent structure and geometric properties of the mechanical transmission, the traditional mechanical rolling shear is difficult to meet the requirements of the existing production line update, and the main contradictions are as follows:

[0004] 1. The mechanical crank structure is affected by the geometric load angle, and the crank eccentricity is limited, which causes the impact force on the gear transmission mechanism to be too large after the shearing force is reacted to the gear transmission mechanism, and the transmission mechanism is too complex and heavy, with high manufacturing and maintenance costs.

[0005] 2. The mechanical rolling shear is limited by the rigidity of the crank connecting rod mechanism structure, and cannot adjust the rolling trajectory of the shear blade according to the plate width and plate characteristics, and the application range is too single. SUMMARY

[0006] In view of the above technical situation, the purpose of the present application is to provide a hydraulic drive metal plate rolling shearing machine to solve the above technical problems; it can realize the dynamic adjustment of the rolling trajectory according to the plate characteristics in different material and width range; at the same time, the structure form of double-hydraulic-cylinder differential sequence driving double-connecting-rod force increasing mechanism is adopted to improve the shearing force increasing ratio and the shearing quality of the metal plate.

[0007] To achieve the above object, the technical scheme adopted by the present application is: to provide a hydraulic drive metal plate rolling shear, which comprises a hydraulic rolling shear body, an oscillating roller way, a shear blade gap adjusting device, a pressing oil cylinder and a quick tool changing device; the oscillating roller way is arranged at the outlet side of the hydraulic rolling shear body, the quick tool changing device is fixed to the side pull rod side of the hydraulic rolling shear body, and the shear blade gap adjusting device is arranged inside the frame of the hydraulic rolling shear body; the shear blade gap adjusting device adopts two groups of four pairs of inclined wedge mechanisms to realize the adjustment of the shear blade gap, two pairs of inclined wedge mechanisms of parallel shear blades form a group, and the groups adopt synchronous and opposite movement modes, one group of inclined wedge mechanisms moves downward to drive the movement of the shear blade at the same time that the other group of inclined wedge mechanisms moves upward synchronously.

[0008] The hydraulic rolling shear body comprises a rolling shear frame, an upper tool table, a lower tool table, a left side main hydraulic cylinder, a right side main hydraulic cylinder, a side pull rod and a connecting rod mechanism; the lower tool table is fixed to the lower side of the rolling shear frame through bolts; the cylinder body ends of the left side main hydraulic cylinder and the right side main hydraulic cylinder are respectively hinged to the rolling shear frame, and the specific hinging form is that a joint bearing is arranged at the trunnion of the left side main hydraulic cylinder and the right side main hydraulic cylinder, the outer ring of the joint bearing is arranged in the joint bearing seat of the fixed rolling shear frame ear seat, the left side main hydraulic cylinder and the right side main hydraulic cylinder slightly oscillate along the vertical direction of the movement of the main cylinder, and the oscillation angle range is 0-1.5°; the rod ends of the left side main hydraulic cylinder and the right side main hydraulic cylinder are hinged to the middle point of the connecting rod mechanism; the upper end of the connecting rod mechanism is hinged to the upper plane of the rolling shear frame, and the lower end of the connecting rod mechanism is hinged to the upper tool table; the side surface of the upper tool table is hinged to the side pull rod, and the other end of the side pull rod is hinged to the rolling shear frame; at the same time, two groups of balance oil cylinders are arranged between the upper tool table and the upper cross beam of the rolling shear frame, the internal stress of the rod group of the connecting rod mechanism is formed, the self-weight load of the upper tool table is balanced, the wear gap at the hinging point of the connecting rod mechanism is eliminated, and the consistency of the rolling shear angle and the shear blade overlap amount in the long-period range of the shear blade is ensured.

[0009] The rolling shear frame is composed of two U-shaped side frames, an upper cross beam and pre-tightening bolts, the two U-shaped side frames are fixed to the left and right sides of the lower surface of the upper cross beam through the pre-tightening bolts; the upper and lower hinging points of the connecting rod mechanism are respectively hinged to the rolling shear frame and the upper tool table, and the middle hinging point of the connecting rod mechanism is hinged to the pull ears of the left side main hydraulic cylinder and the right side main hydraulic cylinder; the lower tool table is arranged below the rolling shear frame and is fixed to the rolling shear frame through bolts; the gap between the lower tool table and the upper tool table is adjusted in real time by the shear blade gap adjusting device in the frame.

[0010] The center distance L3 of the two hinging points on the upper side of the connecting rod mechanism and the rolling shear frame is L3=L2+250-350 mm.

[0011] The shear blade gap adjusting device comprises a right-handed screw jack, an upper adjusting wire sleeve, an adjusting lever, a right movable wedge, a right fixed wedge, a left movable wedge, a left fixed wedge, a lower adjusting wire sleeve, a left-handed screw jack, a gap adjusting motor and a gap torque transmission mechanism; the right-handed screw jack and the left-handed screw jack are fixed on the upper plane of the hydraulic rolling shear frame, the torque of the gap adjusting motor is transmitted to the right-handed screw jack and the left-handed screw jack through the gap torque transmission mechanism; the lower end of the right-handed screw jack and the left-handed screw jack is hinged with the upper adjusting wire sleeve, the right thread of the upper adjusting wire sleeve is connected with the adjusting lever, the lower end of the adjusting lever is connected with the upper end of the lower adjusting wire sleeve through the left thread, and the lower end of the lower adjusting wire sleeve is hinged with the left movable wedge and the right movable wedge; the left movable wedge and the right movable wedge are matched with the left fixed wedge and the right fixed wedge fixed on the hydraulic rolling shear body to realize the forward and backward movement of the upper blade table along the forward direction of the plate.

[0012] It is worth emphasizing that the right-handed screw jack and the left-handed screw jack can simultaneously drive the asynchronous upward and downward movement of the left and right wedge block groups under the centralized driving of the torque motor, thereby ensuring that the upper blade table moves to one side while the wedge block group on the other side provides a back stress, avoiding the change of the shear blade gap caused by the backward movement of the shear blade under the horizontal shear component force after the shear blade gap is adjusted to the right position.

[0013] The upper blade table and the upper shear blade are connected in a quick-change manner; the upper shear blade is placed in the inverted "L"-shaped positioning groove of the upper blade table, and is borne by two perpendicular positioning surfaces respectively for the main shear force and the lateral shear force; at the same time, the lateral displacement of the shear blade is constrained through the cooperation of the lateral positioning pin with the pin holes on the upper blade table and the upper shear blade; the compression action of the upper shear blade is realized by the parallel action of multiple locking cylinders, so that the upper shear blade is pressed against the upper blade table; the specific locking mode of the upper shear blade is that the cylinder barrel of the locking cylinder is fixed on the upper blade table, the upper shear blade is pressed against the upper blade table by the spring force of the locking disc spring group through the cooperation of the convex head on the locking cylinder pull rod with the "U"-shaped groove on the upper shear blade.

[0014] The hydraulic rolling shear body is mainly responsible for completing the shearing task of the plate, and realizes the pure rolling shearing movement of the upper blade table through the time sequence movement of the left and right main hydraulic cylinders and the auxiliary movement of the side pull rod; the swing roller is arranged on the outlet side of the hydraulic rolling shear body, and falls before the main shear blade falls, so as to avoid the shear force of the plate falling under the shear blade from acting on the roller during the shearing process; the shear blade gap adjusting device is arranged in the hydraulic rolling shear frame, and is used for adjusting the transverse gap between the upper shear blade and the lower shear blade to realize high-quality shearing of plates with different thicknesses; the quick tool changing device is used for quickly pulling out the shear blade from the frame for maintenance, and quickly pushing the spare tool to the tool changing position to complete the replacement of the shear blade.

[0015] The present application has the beneficial effects that: the hydraulic driven metal plate rolling shear machine provided by the present application greatly increases the force increasing ratio of the shear mechanism through the parallel connection of the double connecting rod mechanism driven by the hydraulic cylinder in time sequence; in addition, the problem that the shear track of the traditional mechanical rolling shear cannot be dynamically adjusted according to the plate type and the plate thickness and width is avoided; at the same time, the positive and reverse asynchronous motion is adopted, the rigidity of the shear blade gap adjusting mechanism is improved, the influence of the shear blade gap on the shear quality caused by the spring fluctuation during the working of the traditional single inclined wedge + spring is solved, and the non-driven wear amount of the inclined wedge is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a front view of the hydraulic rolling shear equipment;

[0017] Figure 2 is a side view of the hydraulic rolling shear equipment;

[0018] Figure 3 is a schematic view of the hydraulic rolling shear machine body;

[0019] Figure 4 is a schematic view of the shear blade gap adjusting device of the hydraulic rolling shear machine;

[0020] Figure 5 is a side view of the shear blade gap adjusting device of the hydraulic rolling shear machine;

[0021] Figure 6 is a schematic view of the rolling shear machine frame device;

[0022] Figure 7 is a side view of the rolling shear machine frame;

[0023] Figure 8 is an assembly front view of the upper knife table and the connecting rod mechanism;

[0024] Figure 9 is an A-A sectional view of the upper knife table and the connecting rod mechanism;

[0025] Figure 10 is an E-E sectional view of the upper knife table and the connecting rod mechanism;

[0026] Figure 11 is a left view of the upper shear blade locking assembly;

[0027] Figure 12 is a front view of the upper shear blade locking assembly;

[0028] In the diagram: 1. Blade gap adjustment device; 2. Roller shear frame; 3. Upper blade holder; 4. Right main hydraulic cylinder; 5. Lower blade holder; 6. Quick blade change device; 7. Side pull rod; 8. Left main hydraulic cylinder; 9. Linkage mechanism; 10. Clamping cylinder; 11. Wedge block assembly; 12. Swinging roller conveyor; 13. Positive spiral jack; 14. Upper adjusting screw sleeve; 15. Adjusting lever; 16. Right movable wedge; 17. Right fixed wedge; 18. Left movable wedge; 19. Left fixed wedge. 20. Fixed wedge; 21. Lower adjusting threaded sleeve; 22. Reverse spiral jack; 23. Gap adjusting motor; 24. Gap torque transmission mechanism; 25. U-shaped side frame; 26. Upper crossbeam; 27. Preload bolt; 28. Balance cylinder; 29. ​​Upper shear blade; 30. Locking cylinder pull rod; 31. Locking cylinder; 32. Spherical bearing; 33. Spherical bearing seat; 34. Spherical bearing cover; 35. Locking cylinder body; 36. Locking disc spring assembly; 37. Shear blade side positioning pin. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other solutions obtained by those skilled in the art based on the solutions of the present invention without creative effort are within the scope of protection of the present invention.

[0030] The invention will now be described with reference to the accompanying drawings, such as... Figures 1-3 As shown, a hydraulically driven metal sheet rolling shearing machine is provided, the structure of which includes a hydraulic rolling shear body, a shear blade gap adjustment device 1, a swing roller conveyor 12, a clamping cylinder 10, and a quick blade change device 6; wherein the shear blade gap adjustment device 1 is installed inside the rolling shear frame 2 of the hydraulic rolling shear body, the swing roller conveyor 12 is set on the outlet side of the hydraulic rolling shear body, and the quick blade change device 6 is fixed to the side pull rod side of the hydraulic rolling shear body; the lower blade table 5 of the hydraulic rolling shear body structure is fixed to the lower side of the rolling shear frame 2 by bolts, the cylinder ends of the left main hydraulic cylinder 8 and the right main hydraulic cylinder 4 are respectively hinged to the rolling shear frame 2, and the rod ends of the left main hydraulic cylinder 8 and the right main hydraulic cylinder 4 are hinged to the midpoint of the linkage mechanism 9; the upper end of the linkage mechanism 9 is hinged to the upper plane of the rolling shear frame 2, and the lower end of the linkage mechanism 9 is hinged to the upper blade table 3; a side pull rod 7 is hinged to the side of the upper blade table 3, and the other end of the side pull rod 7 is hinged to the rolling shear frame 2; as shown Figure 3 As shown, the center distance L3 between the two hinge points on the upper side of the linkage mechanism and the roller shear frame is equal to the center distance L2 between the two hinge points on the lower side of the linkage mechanism and the upper blade table. The maximum width of the sheared plate is L1 + 250~350mm.

[0031] like Figure 4 , 5The shown shear blade gap adjusting device 1 uses two groups-four pairs of wedge mechanisms to realize the adjustment of the shear blade gap. The two pairs of wedge mechanisms of the parallel shear blades are a group. The groups use synchronous and opposite movement mode. One group of wedge moves downward to drive the shear blade to move at the same time, and the other group of wedge moves upward synchronously. The shear blade gap adjusting device 1 is arranged in the roll cutting shear frame, and adjusts the transverse gap between the upper shear blade and the lower shear blade. The positive screw jack 13 and the reverse screw jack 21 are fixed on the upper plane of the hydraulic roll cutting shear frame. The gap torque transmission mechanism 23 transmits the torque of the gap adjusting motor 22 to the positive screw jack 13 and the reverse screw jack 21. The lower end of the positive screw jack 13 and the reverse screw jack 21 is hinged with the upper adjusting wire sleeve 14. The lower thread of the upper adjusting wire sleeve 14 is connected with the adjusting lever 15. The lower end of the adjusting lever 15 is connected with the lower adjusting wire sleeve 20 through the reverse thread. The lower end of the lower adjusting wire sleeve 20 is hinged with the left movable wedge 18 and the right movable wedge 16. The left movable wedge 18 and the right movable wedge 16 realize the forward and backward movement of the upper tool table 3 along the forward direction of the plate through the cooperation with the left fixed wedge 19 and the right fixed wedge 17 fixed on the body of the hydraulic roll cutting shear. The positive screw jack 13 and the reverse screw jack 21 drive the asynchronous upward and downward movement of the left and right wedge blocks under the centralized driving of the torque motor, and ensure that the upper tool table 3 moves to one side while the wedge block on the other side provides back stress.

[0032] As shown in the figure Figures 6-10 The two U-shaped side frames 24 of the roll cutting shear frame are fixed on the two sides of the lower surface of the upper cross beam 25 by pre-tightening bolts 26, and are connected with the lower tool table 5 to form a closed force frame. A plurality of balance oil cylinders 27 are arranged in the closed loop movement frame composed of the upper cross beam 25, the connecting rod mechanism 9 and the upper tool table 3 of the roll cutting shear frame. The trunnion of the left main hydraulic cylinder 8 and the right main hydraulic cylinder 4 is provided with a joint bearing 31. The outer ring of the joint bearing 31 is arranged in the joint bearing seat 32 of the fixed roll cutting shear frame ear seat. A joint bearing cover 33 is arranged outside the joint bearing 31. The upper tool table 3 is located in the U-shaped groove of the roll cutting shear frame 2 and directly contacts with the inner surface of the U-shaped groove of the U-shaped side frame 24 through four pairs of wedge mechanisms. The upper shear blade 28 is connected with the upper tool table 3 in a quick-change manner, and is placed in the inverted “L” type positioning groove of the upper tool table 3. The upper shear blade 28 is supported by two perpendicular positioning surfaces to bear the main shearing force and the lateral force of shearing respectively. Figure 12 As shown in the figure Figure 11 The lateral positioning pin 36 of the shear blade is matched with the pin hole on the upper tool table 3 and the upper shear blade 28 to realize the lateral displacement constraint of the shear blade. The pressing action of the upper shear blade 28 is realized by the parallel action of a plurality of locking cylinders 30 to press the upper shear blade against the upper tool table.

[0033] When the shearing unit receives the shearing command and incoming material information from the secondary control system, the shear gap is adjusted according to the thickness information of the incoming material. The shear gap adjustment device 1 starts to dynamically adjust the shear gap. The specific action sequence is as follows: After the gap adjustment motor 22 receives the action instruction of the PLC, it drives the gap torque transmission mechanism 23, drives the left and right two positive screw jacks 13 and the reverse screw jacks 21 to move up and down, drives the left and right upper adjustment wire sleeves 14, adjustment rods 15 and lower adjustment wire sleeves 20 transmission group to move up and down, and then drives the left movable wedge 18 and the right movable wedge 16 to move up and down, and cooperates with the left fixed wedge 19 and the right fixed wedge 17 fixed on the roll cutting shear frame 2, converts the up and down movement of the wedge block group 11 into the horizontal movement of the upper tool table 3 along the moving direction of the plate, thereby completing the adjustment of the shear gap.

[0034] After the adjustment of the shear gap is completed, the swing falls and gives the shear blade enough travel space; at the same time, the pressing oil cylinder 10 completes the pressing of the plate; after the preparation action is completed, the left main hydraulic cylinder 8 and the right main hydraulic cylinder 4 hinged on the roll cutting shear frame 2 are driven by the trajectory curve, push the connecting rod mechanism 9 to drive the upper tool table 3 to move in a pure roll cutting motion, and under the constraint of the side pull rod 7, rely on the support of the lower tool table 5 to complete the high-quality shearing of high-toughness plate; when the shear blade is worn to a certain extent, the one-machine double-station quick tool changing device 6 is used to quickly complete the disengagement, pull-out, push-in and locking actions of the upper and lower shear blades.

[0035] It is worth emphasizing that the shear gap adjustment device 1 not only has the ability to dynamically adjust the shear gap, but also can quickly adjust the non-parallelism parameter between the upper and lower shear blades. Mainly by adjusting the adjustment rod 15 in the shear gap adjustment device 1, through the upper adjustment wire sleeve 14 and the lower adjustment wire sleeve 20 with opposite rotation directions, the up and down micro-movement of the upper adjustment wire sleeve 14 and the lower adjustment wire sleeve 20 is realized, and then the non-parallelism between the upper and lower shear blades is corrected.

Claims

1. A hydraulically driven metal sheet rolling shear, comprising a hydraulic rolling shear body, a swing roller conveyor (12), a clamping cylinder (10), and a quick blade change device (6); the hydraulic rolling shear body comprises a rolling shear frame (2), an upper blade table (3), a lower blade table (5), a left main hydraulic cylinder (8), a right main hydraulic cylinder (4), a side tie rod (7), and a linkage mechanism (9); wherein, The lower blade table (5) is fixed to the lower side of the rotary cutting shear frame (2) by bolts. The cylinder ends of the left main hydraulic cylinder (8) and the right main hydraulic cylinder (4) are respectively hinged to the rotary cutting shear frame (2). The rod ends of the left main hydraulic cylinder (8) and the right main hydraulic cylinder (4) are hinged to the midpoint of the linkage mechanism (9). The upper end of the linkage mechanism (9) is hinged to the upper plane of the rotary cutting shear frame (2), and the lower end of the linkage mechanism (9) is hinged to the upper blade table (3). A side pull rod (7) is hinged to the side of the upper blade table (3), and the other end of the side pull rod (7) is hinged to the rotary cutting shear frame (2). The swing roller conveyor (12) is set on the outlet side of the hydraulic rotary cutting shear body, and the quick blade changing device (6) is fixed to the side pull rod side of the hydraulic rotary cutting shear body. The feature is that: It also includes a shear blade gap adjustment device (1), which is installed in the frame of the rolling shear machine to adjust the transverse gap between the upper and lower shear blades; the shear blade gap adjustment device (1) uses two sets to four pairs of wedge mechanisms to adjust the shear blade gap. The two pairs of wedge mechanisms parallel to the shear blades form a set, and the sets adopt a synchronous and opposite motion mode. While one set of wedges moves downward to drive the shear blade to move, the other set of wedges moves upward synchronously. The shear blade gap adjustment device (1) includes a positive spiral jack (13), an upper adjusting thread sleeve (14), an adjusting rod (15), a right movable wedge (16), a right fixed wedge (17), a left movable wedge (18), a left fixed wedge (19), a lower adjusting thread sleeve (20), a negative spiral jack (21), a gap adjustment motor (22), and a gap torque transmission mechanism (23); wherein the positive spiral jack (13) and the negative spiral jack (21) are fixed on the upper plane of the hydraulic rolling shear frame, and the torque of the gap adjustment motor (22) is transmitted to the positive spiral jack (13) and the negative spiral jack (21) by the gap torque transmission mechanism (23). On the rotary jack (21); the lower ends of the positive spiral jack (13) and the negative spiral jack (21) are hinged with an upper adjusting sleeve (14), the lower thread of the upper adjusting sleeve (14) is connected to the adjusting rod (15), the lower end of the adjusting rod (15) is connected to the lower adjusting sleeve (20) through the reverse thread, and the lower end of the lower adjusting sleeve (20) is hinged to the left movable wedge (18) and the right movable wedge (16); the left movable wedge (18) and the right movable wedge (16) cooperate with the left fixed wedge (19) and the right fixed wedge (17) fixed on the hydraulic rolling shear body to realize the forward and backward movement of the upper blade table (3) along the forward direction of the plate; Under the concentrated drive of the torque motor, the positive spiral jack (13) and the negative spiral jack (21) simultaneously drive the left and right wedges to move asynchronously up and down, ensuring that while the upper tool table (3) moves to one side, the wedges on the other side provide back stress. When the main shear blade falls, the swing roller conveyor falls first to avoid the shearing force of the shear blade pulling the plate down during the shearing process from acting on the roller conveyor. The center distance L3 between the two hinge points on the upper side of the connecting rod mechanism (9) hinged to the rolling shear frame is equal to the center distance L2 between the two hinge points on the lower side of the connecting rod mechanism (9) hinged to the upper knife table (3), which is equal to the maximum plate width L1 of the sheared sheet + 250 - 350 mm; The cylinder ends of the left main hydraulic cylinder (8) and the right main hydraulic cylinder (4) are respectively hinged to the rolling shear frame (2). The specific hinged form is that a spherical plain bearing (31) is installed at the trunnion of the left main hydraulic cylinder (8) and the right main hydraulic cylinder (4), and the outer ring of the spherical plain bearing (31) is placed in the spherical plain bearing housing (32) of the fixed rolling shear frame ear seat; the left main hydraulic cylinder (8) and the right main hydraulic cylinder (4) swing slightly along the direction perpendicular to the movement direction of the main cylinder, and the swing angle range is 0 - 1.5°.

2. The hydraulically driven metal sheet rolling shearing machine according to claim 1, characterized in that: Two groups of balance cylinders are installed between the upper knife table (3) and the upper cross beam (25) of the rolling shear frame to form the internal stress of the connecting rod mechanism rod group and balance the self-weight load of the upper knife table (3).

3. The hydraulically driven metal sheet rolling shearing machine according to claim 1, characterized in that: The upper and lower hinge points of the connecting rod mechanism (9) are respectively hinged to the rolling shear frame (2) and the upper knife table (3); the lower knife table is placed under the rolling shear frame and is fixed to the rolling shear frame by bolts; the gap between the lower knife table (5) and the upper knife table (3) is adjusted in real time by the shear blade gap adjustment device (1) inside the frame.

4. A hydraulically driven metal sheet rolling shearing machine according to claim 1, characterized in that: The rolling shear frame is composed of two U-shaped side frames (24), an upper cross beam (25) and pre-tightening bolts (26). Among them, the two U-shaped side frames (24) are fixed on both sides of the lower surface of the upper cross beam (25) by pre-tightening bolts (26) and are connected to the lower knife table (5) to form a closed force-bearing frame.

5. A hydraulically driven metal sheet rolling shearing machine according to claim 1, characterized in that: Inside the closed-loop motion frame composed of the upper cross beam (25) of the rolling shear frame, the connecting rod mechanism (9) and the upper knife table (3), multiple groups of balance cylinders are installed.

6. A hydraulically driven metal sheet rolling shearing machine according to claim 1, characterized in that: The upper knife table (3) is located in the U-shaped groove of the rolling shear frame (2) and is in direct contact with the inner surface of the U-shaped groove of the U-shaped side frame (24) through four pairs of wedge mechanisms.

7. A hydraulically driven metal sheet rolling shearing machine according to claim 1, characterized in that: The upper knife table (3) is provided with an "L"-shaped positioning groove. The upper shear blade (28) is connected to the upper knife table (3) by a quick-change connection method, and the upper shear blade (28) is placed in the inverted "L"-shaped positioning groove of the upper knife table (3), and the main shearing force and the lateral force of shearing are respectively borne by two perpendicular positioning surfaces; the specific locking method of the upper shear blade is that the cylinder barrel of the locking cylinder (30) is fixed on the upper knife table, and the convex head on the locking cylinder pull rod (29) cooperates with the "U"-shaped groove on the upper shear blade (28), and the spring force of the locking disc spring group (35) presses the upper shear blade (28) against the upper knife table (3).

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